// Azgaar (azgaar.fmg@yandex.com). Minsk, 2017-2021. MIT License
// https://github.com/Azgaar/Fantasy-Map-Generator

'use strict';
const version = '1.63'; // generator version
document.title += ' v' + version;

// Logging constants
const PRODUCTION = window.location.host;
const DEBUG = localStorage.getItem('debug');
const INFO = DEBUG || !PRODUCTION;
const TIME = DEBUG || !PRODUCTION;
const WARN = true;
const ERROR = true;

// if map version is not stored, clear localStorage and show a message
if (rn(localStorage.getItem('version'), 1) !== rn(version, 1)) {
  localStorage.clear();
  setTimeout(showWelcomeMessage, 8000);
}

// append svg layers (in default order)
let svg = d3.select('#map');
let defs = svg.select('#deftemp');
let viewbox = svg.select('#viewbox');
let scaleBar = svg.select('#scaleBar');
let legend = svg.append('g').attr('id', 'legend');
let ocean = viewbox.append('g').attr('id', 'ocean');
let oceanLayers = ocean.append('g').attr('id', 'oceanLayers');
let oceanPattern = ocean.append('g').attr('id', 'oceanPattern');
let lakes = viewbox.append('g').attr('id', 'lakes');
let landmass = viewbox.append('g').attr('id', 'landmass');
let texture = viewbox.append('g').attr('id', 'texture');
let terrs = viewbox.append('g').attr('id', 'terrs');
let biomes = viewbox.append('g').attr('id', 'biomes');
let cells = viewbox.append('g').attr('id', 'cells');
let gridOverlay = viewbox.append('g').attr('id', 'gridOverlay');
let coordinates = viewbox.append('g').attr('id', 'coordinates');
let compass = viewbox.append('g').attr('id', 'compass');
let rivers = viewbox.append('g').attr('id', 'rivers');
let terrain = viewbox.append('g').attr('id', 'terrain');
let relig = viewbox.append('g').attr('id', 'relig');
let cults = viewbox.append('g').attr('id', 'cults');
let regions = viewbox.append('g').attr('id', 'regions');
let statesBody = regions.append('g').attr('id', 'statesBody');
let statesHalo = regions.append('g').attr('id', 'statesHalo');
let provs = viewbox.append('g').attr('id', 'provs');
let zones = viewbox.append('g').attr('id', 'zones').style('display', 'none');
let borders = viewbox.append('g').attr('id', 'borders');
let stateBorders = borders.append('g').attr('id', 'stateBorders');
let provinceBorders = borders.append('g').attr('id', 'provinceBorders');
let routes = viewbox.append('g').attr('id', 'routes');
let roads = routes.append('g').attr('id', 'roads');
let trails = routes.append('g').attr('id', 'trails');
let searoutes = routes.append('g').attr('id', 'searoutes');
let temperature = viewbox.append('g').attr('id', 'temperature');
let coastline = viewbox.append('g').attr('id', 'coastline');
let ice = viewbox.append('g').attr('id', 'ice').style('display', 'none');
let prec = viewbox.append('g').attr('id', 'prec').style('display', 'none');
let population = viewbox.append('g').attr('id', 'population');
let goods = viewbox.append('g').attr('id', 'goods');
let emblems = viewbox.append('g').attr('id', 'emblems').style('display', 'none');
let labels = viewbox.append('g').attr('id', 'labels');
let icons = viewbox.append('g').attr('id', 'icons');
let burgIcons = icons.append('g').attr('id', 'burgIcons');
let anchors = icons.append('g').attr('id', 'anchors');
let armies = viewbox.append('g').attr('id', 'armies').style('display', 'none');
let markers = viewbox.append('g').attr('id', 'markers').style('display', 'none');
let fogging = viewbox.append('g').attr('id', 'fogging-cont').attr('mask', 'url(#fog)').append('g').attr('id', 'fogging').style('display', 'none');
let ruler = viewbox.append('g').attr('id', 'ruler').style('display', 'none');
let debug = viewbox.append('g').attr('id', 'debug');

// lake and coast groups
lakes.append('g').attr('id', 'freshwater');
lakes.append('g').attr('id', 'salt');
lakes.append('g').attr('id', 'sinkhole');
lakes.append('g').attr('id', 'frozen');
lakes.append('g').attr('id', 'lava');
lakes.append('g').attr('id', 'dry');
coastline.append('g').attr('id', 'sea_island');
coastline.append('g').attr('id', 'lake_island');

labels.append('g').attr('id', 'states');
labels.append('g').attr('id', 'addedLabels');

let burgLabels = labels.append('g').attr('id', 'burgLabels');
burgIcons.append('g').attr('id', 'cities');
burgLabels.append('g').attr('id', 'cities');
anchors.append('g').attr('id', 'cities');

burgIcons.append('g').attr('id', 'towns');
burgLabels.append('g').attr('id', 'towns');
anchors.append('g').attr('id', 'towns');

// population groups
population.append('g').attr('id', 'rural');
population.append('g').attr('id', 'urban');

// emblem groups
emblems.append('g').attr('id', 'burgEmblems');
emblems.append('g').attr('id', 'provinceEmblems');
emblems.append('g').attr('id', 'stateEmblems');

// fogging
fogging.append('rect').attr('x', 0).attr('y', 0).attr('width', '100%').attr('height', '100%');
fogging.append('rect').attr('x', 0).attr('y', 0).attr('width', '100%').attr('height', '100%').attr('fill', '#e8f0f6').attr('filter', 'url(#splotch)');

// assign events separately as not a viewbox child
scaleBar.on('mousemove', () => tip('Click to open Units Editor')).on('click', () => editUnits());
legend.on('mousemove', () => tip('Drag to change the position. Click to hide the legend')).on('click', () => clearLegend());

// main data variables
let grid = {}; // initial grapg based on jittered square grid and data
let pack = {}; // packed graph and data
let seed,
  mapId,
  mapHistory = [],
  elSelected,
  modules = {},
  notes = [];
let rulers = new Rulers();
let customization = 0; // 0 - no; 1 = heightmap draw; 2 - states draw; 3 - add state/burg; 4 - cultures draw

let biomesData = applyDefaultBiomesSystem();
let nameBases = Names.getNameBases(); // cultures-related data
const fonts = ['Almendra+SC', 'Georgia', 'Arial', 'Times+New+Roman', 'Comic+Sans+MS', 'Lucida+Sans+Unicode', 'Courier+New']; // default web-safe fonts

let color = d3.scaleSequential(d3.interpolateSpectral); // default color scheme
const lineGen = d3.line().curve(d3.curveBasis); // d3 line generator with default curve interpolation

// d3 zoom behavior
let scale = 1,
  viewX = 0,
  viewY = 0;
const zoom = d3.zoom().scaleExtent([1, 20]).on('zoom', zoomed);

// default options
let options = {pinNotes: false}; // options object
let mapCoordinates = {}; // map coordinates on globe
options.winds = [225, 45, 225, 315, 135, 315]; // default wind directions

let populationRate = +document.getElementById('populationRateInput').value;
let urbanization = +document.getElementById('urbanizationInput').value;

applyStoredOptions();
let graphWidth = +mapWidthInput.value,
  graphHeight = +mapHeightInput.value; // voronoi graph extention, cannot be changed arter generation
let svgWidth = graphWidth,
  svgHeight = graphHeight; // svg canvas resolution, can be changed
landmass.append('rect').attr('x', 0).attr('y', 0).attr('width', graphWidth).attr('height', graphHeight);
oceanPattern.append('rect').attr('fill', 'url(#oceanic)').attr('x', 0).attr('y', 0).attr('width', graphWidth).attr('height', graphHeight);
oceanLayers.append('rect').attr('id', 'oceanBase').attr('x', 0).attr('y', 0).attr('width', graphWidth).attr('height', graphHeight);

void (function removeLoading() {
  d3.select('#loading').transition().duration(4000).style('opacity', 0).remove();
  d3.select('#initial').transition().duration(4000).attr('opacity', 0).remove();
  d3.select('#optionsContainer').transition().duration(3000).style('opacity', 1);
  d3.select('#tooltip').transition().duration(4000).style('opacity', 1);
})();

// decide which map should be loaded or generated on page load
void (function checkLoadParameters() {
  const url = new URL(window.location.href);
  const params = url.searchParams;

  // of there is a valid maplink, try to load .map file from URL
  if (params.get('maplink')) {
    WARN && console.warn('Load map from URL');
    const maplink = params.get('maplink');
    const pattern = /(ftp|http|https):\/\/(\w+:{0,1}\w*@)?(\S+)(:[0-9]+)?(\/|\/([\w#!:.?+=&%@!\-\/]))?/;
    const valid = pattern.test(maplink);
    if (valid) return loadMapFromURL(maplink, 1);

    showUploadErrorMessage('Map link is not a valid URL', maplink);
  }

  // if there is a seed (user of MFCG provided), generate map for it
  if (params.get('seed')) {
    WARN && console.warn('Generate map for seed');
    generateMapOnLoad();
    return;
  }

  // open latest map if option is active and map is stored
  if (onloadMap.value === 'saved') {
    ldb.get('lastMap', (blob) => {
      if (blob) {
        WARN && console.warn('Load last saved map');
        try {
          uploadMap(blob);
        } catch (error) {
          ERROR && console.error(error);
          WARN && console.warn('Cannot load stored map, random map to be generated');
          generateMapOnLoad();
        }
      } else {
        ERROR && console.error('No map stored, random map to be generated');
        generateMapOnLoad();
      }
    });
    return;
  }

  WARN && console.warn('Generate random map');
  generateMapOnLoad();
})();

function loadMapFromURL(maplink, random) {
  const URL = decodeURIComponent(maplink);

  fetch(URL, {method: 'GET', mode: 'cors'})
    .then((response) => {
      if (response.ok) return response.blob();
      throw new Error('Cannot load map from URL');
    })
    .then((blob) => uploadMap(blob))
    .catch((error) => {
      showUploadErrorMessage(error.message, URL, random);
      if (random) generateMapOnLoad();
    });
}

function showUploadErrorMessage(error, URL, random) {
  ERROR && console.error(error);
  alertMessage.innerHTML = `Cannot load map from the ${link(URL, 'link provided')}.
    ${random ? `A new random map is generated. ` : ''}
    Please ensure the linked file is reachable and CORS is allowed on server side`;
  $('#alert').dialog({
    title: 'Loading error',
    width: '32em',
    buttons: {
      OK: function () {
        $(this).dialog('close');
      }
    }
  });
}

function generateMapOnLoad() {
  applyStyleOnLoad(); // apply default of previously selected style
  generate(); // generate map
  focusOn(); // based on searchParams focus on point, cell or burg from MFCG
  applyPreset(); // apply saved layers preset
}

// focus on coordinates, cell or burg provided in searchParams
function focusOn() {
  const url = new URL(window.location.href);
  const params = url.searchParams;

  if (params.get('from') === 'MFCG' && document.referrer) {
    if (params.get('seed').length === 13) {
      // show back burg from MFCG
      params.set('burg', params.get('seed').slice(-4));
    } else {
      // select burg for MFCG
      findBurgForMFCG(params);
      return;
    }
  }

  const s = +params.get('scale') || 8;
  let x = +params.get('x');
  let y = +params.get('y');

  const c = +params.get('cell');
  if (c) {
    x = pack.cells.p[c][0];
    y = pack.cells.p[c][1];
  }

  const b = +params.get('burg');
  if (b && pack.burgs[b]) {
    x = pack.burgs[b].x;
    y = pack.burgs[b].y;
  }

  if (x && y) zoomTo(x, y, s, 1600);
}

// find burg for MFCG and focus on it
function findBurgForMFCG(params) {
  const {cells, burgs} = pack;
  if (burgs.length < 2) return ERROR && console.error('Cannot select a burg for MFCG');

  // used for selection
  const size = +params.get('size');
  const coast = +params.get('coast');
  const port = +params.get('port');
  const river = +params.get('river');

  let selection = defineSelection(coast, port, river);
  if (!selection.length) selection = defineSelection(coast, !port, !river);
  if (!selection.length) selection = defineSelection(!coast, 0, !river);
  if (!selection.length) selection = [burgs[1]]; // select first if nothing is found

  function defineSelection(coast, port, river) {
    if (port && river) return burgs.filter((b) => b.port && cells.r[b.cell]);
    if (!port && coast && river) return burgs.filter((b) => !b.port && cells.t[b.cell] === 1 && cells.r[b.cell]);
    if (!coast && !river) return burgs.filter((b) => cells.t[b.cell] !== 1 && !cells.r[b.cell]);
    if (!coast && river) return burgs.filter((b) => cells.t[b.cell] !== 1 && cells.r[b.cell]);
    if (coast && river) return burgs.filter((b) => cells.t[b.cell] === 1 && cells.r[b.cell]);
    return [];
  }

  // select a burg with closest population from selection
  const selected = d3.scan(selection, (a, b) => Math.abs(a.population - size) - Math.abs(b.population - size));
  const burgId = selection[selected].i;
  if (!burgId) {
    ERROR && console.error('Cannot select a burg for MFCG');
    return;
  }

  const b = burgs[burgId];
  const referrer = new URL(document.referrer);
  for (let p of referrer.searchParams) {
    if (p[0] === 'name') b.name = p[1];
    else if (p[0] === 'size') b.population = +p[1];
    else if (p[0] === 'seed') b.MFCG = +p[1];
    else if (p[0] === 'shantytown') b.shanty = +p[1];
    else b[p[0]] = +p[1]; // other parameters
  }
  b.MFCGlink = document.referrer; // set direct link to MFCG
  if (params.get('name') && params.get('name') != 'null') b.name = params.get('name');

  const label = burgLabels.select("[data-id='" + burgId + "']");
  if (label.size()) {
    label
      .text(b.name)
      .classed('drag', true)
      .on('mouseover', function () {
        d3.select(this).classed('drag', false);
        label.on('mouseover', null);
      });
  }

  zoomTo(b.x, b.y, 8, 1600);
  invokeActiveZooming();
  tip('Here stands the glorious city of ' + b.name, true, 'success', 15000);
}

// apply default biomes data
function applyDefaultBiomesSystem() {
  const name = [
    'Marine',
    'Hot desert',
    'Cold desert',
    'Savanna',
    'Grassland',
    'Tropical seasonal forest',
    'Temperate deciduous forest',
    'Tropical rainforest',
    'Temperate rainforest',
    'Taiga',
    'Tundra',
    'Glacier',
    'Wetland'
  ];
  const color = ['#466eab', '#fbe79f', '#b5b887', '#d2d082', '#c8d68f', '#b6d95d', '#29bc56', '#7dcb35', '#409c43', '#4b6b32', '#96784b', '#d5e7eb', '#0b9131'];
  const habitability = [0, 4, 10, 25, 40, 60, 100, 80, 90, 12, 4, 0, 12];
  const iconsDensity = [0, 3, 2, 120, 120, 120, 120, 150, 150, 100, 5, 0, 150];
  const icons = [
    {},
    {dune: 3, cactus: 6, deadTree: 1},
    {dune: 9, deadTree: 1},
    {acacia: 1, grass: 9},
    {grass: 1},
    {acacia: 8, palm: 1},
    {deciduous: 1},
    {acacia: 5, palm: 3, deciduous: 1, swamp: 1},
    {deciduous: 6, swamp: 1},
    {conifer: 1},
    {grass: 1},
    {},
    {swamp: 1}
  ];
  const cost = [10, 200, 150, 60, 50, 70, 70, 80, 90, 200, 1000, 5000, 150]; // biome movement cost
  const biomesMartix = [
    // hot ↔ cold [>19°C; <-4°C]; dry ↕ wet
    new Uint8Array([1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 10]),
    new Uint8Array([3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 9, 9, 9, 9, 10, 10, 10]),
    new Uint8Array([5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 9, 9, 9, 9, 9, 10, 10, 10]),
    new Uint8Array([5, 6, 6, 6, 6, 6, 6, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 10, 10, 10]),
    new Uint8Array([7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 10, 10])
  ];

  // parse icons weighted array into a simple array
  for (let i = 0; i < icons.length; i++) {
    const parsed = [];
    for (const icon in icons[i]) {
      for (let j = 0; j < icons[i][icon]; j++) {
        parsed.push(icon);
      }
    }
    icons[i] = parsed;
  }

  return {i: d3.range(0, name.length), name, color, biomesMartix, habitability, iconsDensity, icons, cost};
}

function showWelcomeMessage() {
  const post = link('https://www.patreon.com/posts/48228540', 'Main changes:');
  const changelog = link('https://github.com/Azgaar/Fantasy-Map-Generator/wiki/Changelog', 'previous version');
  const reddit = link('https://www.reddit.com/r/FantasyMapGenerator', 'Reddit community');
  const discord = link('https://discordapp.com/invite/X7E84HU', 'Discord server');
  const patreon = link('https://www.patreon.com/azgaar', 'Patreon');

  alertMessage.innerHTML = `The Fantasy Map Generator is updated up to version <b>${version}</b>.
    This version is compatible with ${changelog}, loaded <i>.map</i> files will be auto-updated.
    <ul>${post}
      <li>River overview and River editor rework</li>
      <li>River generation code refactored and optimized</li>
      <li>Rivers discharge (flux) and mouth width calculated</li>
      <li>Lake editor rework</li>
      <li>Lake type based on evaporation and river system</li>
      <li>Lake flux, inlets and outlet tracked properly</li>
      <li>Lake outlet width depends on flux</li>
      <li>Lakes now have names</li>
      <li>Rulers rework (v1.61)</li>
      <li>New ocean pattern by Kiwiroo (v1.61)</li>
      <li>Water erosion rework (v1.62)</li>
    </ul>

    <p>Join our ${discord} and ${reddit} to ask questions, share maps, discuss the Generator and Worlbuilding, report bugs and propose new features.</p>
    <span>Thanks for all supporters on ${patreon}!</i></span>`;

  $('#alert').dialog({
    resizable: false,
    title: 'Fantasy Map Generator update',
    width: '28em',
    buttons: {
      OK: function () {
        $(this).dialog('close');
      }
    },
    position: {my: 'center center-4em', at: 'center', of: 'svg'},
    close: () => localStorage.setItem('version', version)
  });
}

function zoomed() {
  const transform = d3.event.transform;
  const scaleDiff = scale - transform.k;
  const positionDiff = (viewX - transform.x) | (viewY - transform.y);
  if (!positionDiff && !scaleDiff) return;

  scale = transform.k;
  viewX = transform.x;
  viewY = transform.y;
  viewbox.attr('transform', transform);

  // update grid only if view position
  if (positionDiff) drawCoordinates();

  // rescale only if zoom is changed
  if (scaleDiff) {
    invokeActiveZooming();
    drawScaleBar();
  }

  // zoom image converter overlay
  const canvas = document.getElementById('canvas');
  if (canvas && +canvas.style.opacity) {
    const img = document.getElementById('image');
    const ctx = canvas.getContext('2d');
    ctx.clearRect(0, 0, canvas.width, canvas.height);
    ctx.setTransform(scale, 0, 0, scale, viewX, viewY);
    ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
  }
}

// Zoom to a specific point
function zoomTo(x, y, z = 8, d = 2000) {
  const transform = d3.zoomIdentity.translate(x * -z + graphWidth / 2, y * -z + graphHeight / 2).scale(z);
  svg.transition().duration(d).call(zoom.transform, transform);
}

// Reset zoom to initial
function resetZoom(d = 1000) {
  svg.transition().duration(d).call(zoom.transform, d3.zoomIdentity);
}

// calculate x,y extreme points of viewBox
function getViewBoxExtent() {
  // x = trX / scale * -1 + graphWidth / scale
  // y = trY / scale * -1 + graphHeight / scale
  return [
    [Math.abs(viewX / scale), Math.abs(viewY / scale)],
    [Math.abs(viewX / scale) + graphWidth / scale, Math.abs(viewY / scale) + graphHeight / scale]
  ];
}

// active zooming feature
function invokeActiveZooming() {
  if (coastline.select('#sea_island').size() && +coastline.select('#sea_island').attr('auto-filter')) {
    // toggle shade/blur filter for coatline on zoom
    const filter = scale > 1.5 && scale <= 2.6 ? null : scale > 2.6 ? 'url(#blurFilter)' : 'url(#dropShadow)';
    coastline.select('#sea_island').attr('filter', filter);
  }

  // rescale lables on zoom
  if (labels.style('display') !== 'none') {
    labels.selectAll('g').each(function (d) {
      if (this.id === 'burgLabels') return;
      const desired = +this.dataset.size;
      const relative = Math.max(rn((desired + desired / scale) / 2, 2), 1);
      this.getAttribute('font-size', relative);
      const hidden = hideLabels.checked && (relative * scale < 6 || relative * scale > 50);
      if (hidden) this.classList.add('hidden');
      else this.classList.remove('hidden');
    });
  }

  // rescale emblems on zoom
  if (emblems.style('display') !== 'none') {
    emblems.selectAll('g').each(function () {
      const size = this.getAttribute('font-size') * scale;
      const hidden = hideEmblems.checked && (size < 25 || size > 300);
      if (hidden) this.classList.add('hidden');
      else this.classList.remove('hidden');
      if (!hidden && window.COArenderer && this.children.length && !this.children[0].getAttribute('href')) renderGroupCOAs(this);
    });
  }

  // turn off ocean pattern if scale is big (improves performance)
  oceanPattern
    .select('rect')
    .attr('fill', scale > 10 ? '#fff' : 'url(#oceanic)')
    .attr('opacity', scale > 10 ? 0.2 : null);

  // change states halo width
  if (!customization) {
    const haloSize = rn(statesHalo.attr('data-width') / scale, 1);
    statesHalo.attr('stroke-width', haloSize).style('display', haloSize > 3 ? 'block' : 'none');
  }

  // rescale map markers
  if (+markers.attr('rescale') && markers.style('display') !== 'none') {
    markers.selectAll('use').each(function (d) {
      const x = +this.dataset.x,
        y = +this.dataset.y,
        desired = +this.dataset.size;
      const size = Math.max(desired * 5 + 25 / scale, 1);
      d3.select(this)
        .attr('x', x - size / 2)
        .attr('y', y - size)
        .attr('width', size)
        .attr('height', size);
    });
  }

  // rescale rulers to have always the same size
  if (ruler.style('display') !== 'none') {
    const size = rn((10 / scale ** 0.3) * 2, 2);
    ruler.selectAll('text').attr('font-size', size);
  }
}

async function renderGroupCOAs(g) {
  const [group, type] = g.id === 'burgEmblems' ? [pack.burgs, 'burg'] : g.id === 'provinceEmblems' ? [pack.provinces, 'province'] : [pack.states, 'state'];
  for (let use of g.children) {
    const i = +use.dataset.i;
    const id = type + 'COA' + i;
    COArenderer.trigger(id, group[i].coa);
    use.setAttribute('href', '#' + id);
  }
}

// add drag to upload logic, pull request from @evyatron
void (function addDragToUpload() {
  document.addEventListener('dragover', function (e) {
    e.stopPropagation();
    e.preventDefault();
    document.getElementById('mapOverlay').style.display = null;
  });

  document.addEventListener('dragleave', function (e) {
    document.getElementById('mapOverlay').style.display = 'none';
  });

  document.addEventListener('drop', function (e) {
    e.stopPropagation();
    e.preventDefault();

    const overlay = document.getElementById('mapOverlay');
    overlay.style.display = 'none';
    if (e.dataTransfer.items == null || e.dataTransfer.items.length !== 1) return; // no files or more than one
    const file = e.dataTransfer.items[0].getAsFile();
    if (file.name.indexOf('.map') == -1) {
      // not a .map file
      alertMessage.innerHTML = 'Please upload a <b>.map</b> file you have previously downloaded';
      $('#alert').dialog({
        resizable: false,
        title: 'Invalid file format',
        position: {my: 'center', at: 'center', of: 'svg'},
        buttons: {
          Close: function () {
            $(this).dialog('close');
          }
        }
      });
      return;
    }

    // all good - show uploading text and load the map
    overlay.style.display = null;
    overlay.innerHTML = 'Uploading<span>.</span><span>.</span><span>.</span>';
    if (closeDialogs) closeDialogs();
    uploadMap(file, () => {
      overlay.style.display = 'none';
      overlay.innerHTML = 'Drop a .map file to open';
    });
  });
})();

function generate() {
  try {
    const timeStart = performance.now();
    invokeActiveZooming();
    generateSeed();
    INFO && console.group('Generated Map ' + seed);
    applyMapSize();
    randomizeOptions();
    placePoints();
    calculateVoronoi(grid, grid.points);
    drawScaleBar();
    HeightmapGenerator.generate();
    markFeatures();
    markupGridOcean();
    addLakesInDeepDepressions();
    openNearSeaLakes();

    OceanLayers();
    defineMapSize();
    calculateMapCoordinates();
    calculateTemperatures();
    generatePrecipitation();
    reGraph();
    drawCoastline();

    Rivers.generate();
    Lakes.defineGroup();
    defineBiomes();

    Resources.generate();

    rankCells();
    Cultures.generate();
    Cultures.expand();
    BurgsAndStates.generate();
    Religions.generate();
    BurgsAndStates.defineStateForms();
    BurgsAndStates.generateProvinces();
    BurgsAndStates.defineBurgFeatures();

    drawStates();
    drawBorders();
    BurgsAndStates.drawStateLabels();

    Rivers.specify();
    Lakes.generateName();

    Military.generate();
    addMarkers();
    addZones();
    Names.getMapName();

    WARN && console.warn(`TOTAL: ${rn((performance.now() - timeStart) / 1000, 2)}s`);
    showStatistics();
    INFO && console.groupEnd('Generated Map ' + seed);
  } catch (error) {
    ERROR && console.error(error);
    clearMainTip();

    alertMessage.innerHTML = `An error is occured on map generation. Please retry.
      <br>If error is critical, clear the stored data and try again.
      <p id="errorBox">${parseError(error)}</p>`;
    $('#alert').dialog({
      resizable: false,
      title: 'Generation error',
      width: '32em',
      buttons: {
        'Clear data': function () {
          localStorage.clear();
          localStorage.setItem('version', version);
        },
        Regenerate: function () {
          regenerateMap();
          $(this).dialog('close');
        },
        Ignore: function () {
          $(this).dialog('close');
        }
      },
      position: {my: 'center', at: 'center', of: 'svg'}
    });
  }
}

// generate map seed (string!) or get it from URL searchParams
function generateSeed() {
  const first = !mapHistory[0];
  const url = new URL(window.location.href);
  const params = url.searchParams;
  const urlSeed = url.searchParams.get('seed');
  if (first && params.get('from') === 'MFCG' && urlSeed.length === 13) seed = urlSeed.slice(0, -4);
  else if (first && urlSeed) seed = urlSeed;
  else if (optionsSeed.value && optionsSeed.value != seed) seed = optionsSeed.value;
  else seed = Math.floor(Math.random() * 1e9).toString();
  optionsSeed.value = seed;
  Math.random = aleaPRNG(seed);
}

// Place points to calculate Voronoi diagram
function placePoints() {
  TIME && console.time('placePoints');

  const cellsDesired = +pointsInput.dataset.cells;
  const spacing = (grid.spacing = rn(Math.sqrt((graphWidth * graphHeight) / cellsDesired), 2)); // spacing between points before jirrering
  grid.boundary = getBoundaryPoints(graphWidth, graphHeight, spacing);
  grid.points = getJitteredGrid(graphWidth, graphHeight, spacing); // jittered square grid
  grid.cellsX = Math.floor((graphWidth + 0.5 * spacing) / spacing);
  grid.cellsY = Math.floor((graphHeight + 0.5 * spacing) / spacing);
  TIME && console.timeEnd('placePoints');
}

// calculate Delaunay and then Voronoi diagram
function calculateVoronoi(graph, points) {
  TIME && console.time('calculateDelaunay');
  const n = points.length;
  const allPoints = points.concat(grid.boundary);
  const delaunay = Delaunator.from(allPoints);
  TIME && console.timeEnd('calculateDelaunay');

  TIME && console.time('calculateVoronoi');
  const voronoi = new Voronoi(delaunay, allPoints, n);
  graph.cells = voronoi.cells;
  graph.cells.i = n < 65535 ? Uint16Array.from(d3.range(n)) : Uint32Array.from(d3.range(n)); // array of indexes
  graph.vertices = voronoi.vertices;
  TIME && console.timeEnd('calculateVoronoi');
}

// Mark features (ocean, lakes, islands) and calculate distance field
function markFeatures() {
  TIME && console.time('markFeatures');
  Math.random = aleaPRNG(seed); // get the same result on heightmap edit in Erase mode

  const cells = grid.cells,
    heights = grid.cells.h;
  cells.f = new Uint16Array(cells.i.length); // cell feature number
  cells.t = new Int8Array(cells.i.length); // cell type: 1 = land coast; -1 = water near coast
  grid.features = [0];

  for (let i = 1, queue = [0]; queue[0] !== -1; i++) {
    cells.f[queue[0]] = i; // feature number
    const land = heights[queue[0]] >= 20;
    let border = false; // true if feature touches map border

    while (queue.length) {
      const q = queue.pop();
      if (cells.b[q]) border = true;

      cells.c[q].forEach((c) => {
        const cLand = heights[c] >= 20;
        if (land === cLand && !cells.f[c]) {
          cells.f[c] = i;
          queue.push(c);
        } else if (land && !cLand) {
          cells.t[q] = 1;
          cells.t[c] = -1;
        }
      });
    }
    const type = land ? 'island' : border ? 'ocean' : 'lake';
    grid.features.push({i, land, border, type});

    queue[0] = cells.f.findIndex((f) => !f); // find unmarked cell
  }

  TIME && console.timeEnd('markFeatures');
}

function markupGridOcean() {
  TIME && console.time('markupGridOcean');
  markup(grid.cells, -2, -1, -10);
  TIME && console.timeEnd('markupGridOcean');
}

function markup(cells, start, increment, limit) {
  for (let t = start, count = Infinity; count > 0 && t > limit; t += increment) {
    count = 0;
    const prevT = t - increment;
    for (let i = 0; i < cells.i.length; i++) {
      if (cells.t[i] !== prevT) continue;

      for (const c of cells.c[i]) {
        if (cells.t[c]) continue;
        cells.t[c] = t;
        count++;
      }
    }
  }
}

function addLakesInDeepDepressions() {
  TIME && console.time('addLakesInDeepDepressions');
  const {cells, features} = grid;
  const {c, h, b} = cells;
  const ELEVATION_LIMIT = +document.getElementById('lakeElevationLimitOutput').value;
  if (ELEVATION_LIMIT === 80) return;

  for (const i of cells.i) {
    if (b[i] || h[i] < 20) continue;

    const minHeight = d3.min(c[i].map((c) => h[c]));
    if (h[i] > minHeight) continue;

    let deep = true;
    const threshold = h[i] + ELEVATION_LIMIT;
    const queue = [i];
    const checked = [];
    checked[i] = true;

    // check if elevated cell can potentially pour to water
    while (deep && queue.length) {
      const q = queue.pop();

      for (const n of c[q]) {
        if (checked[n]) continue;
        if (h[n] >= threshold) continue;
        if (h[n] < 20) {
          deep = false;
          break;
        }

        checked[n] = true;
        queue.push(n);
      }
    }

    // if not, add a lake
    if (deep) {
      const lakeCells = [i].concat(c[i].filter((n) => h[n] === h[i]));
      addLake(lakeCells);
    }
  }

  function addLake(lakeCells) {
    const f = features.length;

    lakeCells.forEach((i) => {
      cells.h[i] = 19;
      cells.t[i] = -1;
      cells.f[i] = f;
      c[i].forEach((n) => !lakeCells.includes(n) && (cells.t[c] = 1));
    });

    features.push({i: f, land: false, border: false, type: 'lake'});
  }

  TIME && console.timeEnd('addLakesInDeepDepressions');
}

// near sea lakes usually get a lot of water inflow, most of them should brake threshold and flow out to sea (see Ancylus Lake)
function openNearSeaLakes() {
  if (templateInput.value === 'Atoll') return; // no need for Atolls

  const cells = grid.cells;
  const features = grid.features;
  if (!features.find((f) => f.type === 'lake')) return; // no lakes
  TIME && console.time('openLakes');
  const LIMIT = 22; // max height that can be breached by water

  for (const i of cells.i) {
    const lake = cells.f[i];
    if (features[lake].type !== 'lake') continue; // not a lake cell

    check_neighbours: for (const c of cells.c[i]) {
      if (cells.t[c] !== 1 || cells.h[c] > LIMIT) continue; // water cannot brake this

      for (const n of cells.c[c]) {
        const ocean = cells.f[n];
        if (features[ocean].type !== 'ocean') continue; // not an ocean
        removeLake(c, lake, ocean);
        break check_neighbours;
      }
    }
  }

  function removeLake(threshold, lake, ocean) {
    cells.h[threshold] = 19;
    cells.t[threshold] = -1;
    cells.f[threshold] = ocean;
    cells.c[threshold].forEach(function (c) {
      if (cells.h[c] >= 20) cells.t[c] = 1; // mark as coastline
    });
    features[lake].type = 'ocean'; // mark former lake as ocean
  }

  TIME && console.timeEnd('openLakes');
}

// define map size and position based on template and random factor
function defineMapSize() {
  const [size, latitude] = getSizeAndLatitude();
  const randomize = new URL(window.location.href).searchParams.get('options') === 'default'; // ignore stored options
  if (randomize || !locked('mapSize')) mapSizeOutput.value = mapSizeInput.value = size;
  if (randomize || !locked('latitude')) latitudeOutput.value = latitudeInput.value = latitude;

  function getSizeAndLatitude() {
    const template = document.getElementById('templateInput').value; // heightmap template
    const part = grid.features.some((f) => f.land && f.border); // if land goes over map borders
    const max = part ? 80 : 100; // max size
    const lat = () => gauss(P(0.5) ? 40 : 60, 15, 25, 75); // latiture shift

    if (!part) {
      if (template === 'Pangea') return [100, 50];
      if (template === 'Shattered' && P(0.7)) return [100, 50];
      if (template === 'Continents' && P(0.5)) return [100, 50];
      if (template === 'Archipelago' && P(0.35)) return [100, 50];
      if (template === 'High Island' && P(0.25)) return [100, 50];
      if (template === 'Low Island' && P(0.1)) return [100, 50];
    }

    if (template === 'Pangea') return [gauss(70, 20, 30, max), lat()];
    if (template === 'Volcano') return [gauss(20, 20, 10, max), lat()];
    if (template === 'Mediterranean') return [gauss(25, 30, 15, 80), lat()];
    if (template === 'Peninsula') return [gauss(15, 15, 5, 80), lat()];
    if (template === 'Isthmus') return [gauss(15, 20, 3, 80), lat()];
    if (template === 'Atoll') return [gauss(5, 10, 2, max), lat()];

    return [gauss(30, 20, 15, max), lat()]; // Continents, Archipelago, High Island, Low Island
  }
}

// calculate map position on globe
function calculateMapCoordinates() {
  const size = +document.getElementById('mapSizeOutput').value;
  const latShift = +document.getElementById('latitudeOutput').value;

  const latT = (size / 100) * 180;
  const latN = 90 - ((180 - latT) * latShift) / 100;
  const latS = latN - latT;

  const lon = Math.min(((graphWidth / graphHeight) * latT) / 2, 180);
  mapCoordinates = {latT, latN, latS, lonT: lon * 2, lonW: -lon, lonE: lon};
}

// temperature model
function calculateTemperatures() {
  TIME && console.time('calculateTemperatures');
  const cells = grid.cells;
  cells.temp = new Int8Array(cells.i.length); // temperature array

  const tEq = +temperatureEquatorInput.value;
  const tPole = +temperaturePoleInput.value;
  const tDelta = tEq - tPole;
  const int = d3.easePolyInOut.exponent(0.5); // interpolation function

  d3.range(0, cells.i.length, grid.cellsX).forEach(function (r) {
    const y = grid.points[r][1];
    const lat = Math.abs(mapCoordinates.latN - (y / graphHeight) * mapCoordinates.latT); // [0; 90]
    const initTemp = tEq - int(lat / 90) * tDelta;
    for (let i = r; i < r + grid.cellsX; i++) {
      cells.temp[i] = Math.max(Math.min(initTemp - convertToFriendly(cells.h[i]), 127), -128);
    }
  });

  // temperature decreases by 6.5 degree C per 1km
  function convertToFriendly(h) {
    if (h < 20) return 0;
    const exponent = +heightExponentInput.value;
    const height = Math.pow(h - 18, exponent);
    return rn((height / 1000) * 6.5);
  }

  TIME && console.timeEnd('calculateTemperatures');
}

// simplest precipitation model
function generatePrecipitation() {
  TIME && console.time('generatePrecipitation');
  prec.selectAll('*').remove();
  const cells = grid.cells;
  cells.prec = new Uint8Array(cells.i.length); // precipitation array
  const modifier = precInput.value / 100; // user's input
  const cellsX = grid.cellsX,
    cellsY = grid.cellsY;
  let westerly = [],
    easterly = [],
    southerly = 0,
    northerly = 0;

  {
    // latitude bands
    // x4 = 0-5 latitude: wet through the year (rising zone)
    // x2 = 5-20 latitude: wet summer (rising zone), dry winter (sinking zone)
    // x1 = 20-30 latitude: dry all year (sinking zone)
    // x2 = 30-50 latitude: wet winter (rising zone), dry summer (sinking zone)
    // x3 = 50-60 latitude: wet all year (rising zone)
    // x2 = 60-70 latitude: wet summer (rising zone), dry winter (sinking zone)
    // x1 = 70-90 latitude: dry all year (sinking zone)
  }
  const lalitudeModifier = [4, 2, 2, 2, 1, 1, 2, 2, 2, 2, 3, 3, 2, 2, 1, 1, 1, 0.5]; // by 5d step

  // difine wind directions based on cells latitude and prevailing winds there
  d3.range(0, cells.i.length, cellsX).forEach(function (c, i) {
    const lat = mapCoordinates.latN - (i / cellsY) * mapCoordinates.latT;
    const band = ((Math.abs(lat) - 1) / 5) | 0;
    const latMod = lalitudeModifier[band];
    const tier = (Math.abs(lat - 89) / 30) | 0; // 30d tiers from 0 to 5 from N to S
    if (options.winds[tier] > 40 && options.winds[tier] < 140) westerly.push([c, latMod, tier]);
    else if (options.winds[tier] > 220 && options.winds[tier] < 320) easterly.push([c + cellsX - 1, latMod, tier]);
    if (options.winds[tier] > 100 && options.winds[tier] < 260) northerly++;
    else if (options.winds[tier] > 280 || options.winds[tier] < 80) southerly++;
  });

  // distribute winds by direction
  if (westerly.length) passWind(westerly, 120 * modifier, 1, cellsX);
  if (easterly.length) passWind(easterly, 120 * modifier, -1, cellsX);
  const vertT = southerly + northerly;
  if (northerly) {
    const bandN = ((Math.abs(mapCoordinates.latN) - 1) / 5) | 0;
    const latModN = mapCoordinates.latT > 60 ? d3.mean(lalitudeModifier) : lalitudeModifier[bandN];
    const maxPrecN = (northerly / vertT) * 60 * modifier * latModN;
    passWind(d3.range(0, cellsX, 1), maxPrecN, cellsX, cellsY);
  }
  if (southerly) {
    const bandS = ((Math.abs(mapCoordinates.latS) - 1) / 5) | 0;
    const latModS = mapCoordinates.latT > 60 ? d3.mean(lalitudeModifier) : lalitudeModifier[bandS];
    const maxPrecS = (southerly / vertT) * 60 * modifier * latModS;
    passWind(d3.range(cells.i.length - cellsX, cells.i.length, 1), maxPrecS, -cellsX, cellsY);
  }

  function passWind(source, maxPrec, next, steps) {
    const maxPrecInit = maxPrec;
    for (let first of source) {
      if (first[0]) {
        maxPrec = Math.min(maxPrecInit * first[1], 255);
        first = first[0];
      }
      let humidity = maxPrec - cells.h[first]; // initial water amount
      if (humidity <= 0) continue; // if first cell in row is too elevated cosdired wind dry
      for (let s = 0, current = first; s < steps; s++, current += next) {
        // no flux on permafrost
        if (cells.temp[current] < -5) continue;
        // water cell
        if (cells.h[current] < 20) {
          if (cells.h[current + next] >= 20) {
            cells.prec[current + next] += Math.max(humidity / rand(10, 20), 1); // coastal precipitation
          } else {
            humidity = Math.min(humidity + 5 * modifier, maxPrec); // wind gets more humidity passing water cell
            cells.prec[current] += 5 * modifier; // water cells precipitation (need to correctly pour water through lakes)
          }
          continue;
        }

        // land cell
        const precipitation = getPrecipitation(humidity, current, next);
        cells.prec[current] += precipitation;
        const evaporation = precipitation > 1.5 ? 1 : 0; // some humidity evaporates back to the atmosphere
        humidity = Math.min(Math.max(humidity - precipitation + evaporation, 0), maxPrec);
      }
    }
  }

  function getPrecipitation(humidity, i, n) {
    if (cells.h[i + n] > 85) return humidity; // 85 is max passable height
    const normalLoss = Math.max(humidity / (10 * modifier), 1); // precipitation in normal conditions
    const diff = Math.max(cells.h[i + n] - cells.h[i], 0); // difference in height
    const mod = (cells.h[i + n] / 70) ** 2; // 50 stands for hills, 70 for mountains
    return Math.min(Math.max(normalLoss + diff * mod, 1), humidity);
  }

  void (function drawWindDirection() {
    const wind = prec.append('g').attr('id', 'wind');

    d3.range(0, 6).forEach(function (t) {
      if (westerly.length > 1) {
        const west = westerly.filter((w) => w[2] === t);
        if (west && west.length > 3) {
          const from = west[0][0],
            to = west[west.length - 1][0];
          const y = (grid.points[from][1] + grid.points[to][1]) / 2;
          wind.append('text').attr('x', 20).attr('y', y).text('\u21C9');
        }
      }
      if (easterly.length > 1) {
        const east = easterly.filter((w) => w[2] === t);
        if (east && east.length > 3) {
          const from = east[0][0],
            to = east[east.length - 1][0];
          const y = (grid.points[from][1] + grid.points[to][1]) / 2;
          wind
            .append('text')
            .attr('x', graphWidth - 52)
            .attr('y', y)
            .text('\u21C7');
        }
      }
    });

    if (northerly)
      wind
        .append('text')
        .attr('x', graphWidth / 2)
        .attr('y', 42)
        .text('\u21CA');
    if (southerly)
      wind
        .append('text')
        .attr('x', graphWidth / 2)
        .attr('y', graphHeight - 20)
        .text('\u21C8');
  })();

  TIME && console.timeEnd('generatePrecipitation');
}

// recalculate Voronoi Graph to pack cells
function reGraph() {
  TIME && console.time('reGraph');
  let {cells, points, features} = grid;
  const newCells = {p: [], g: [], h: []}; // to store new data
  const spacing2 = grid.spacing ** 2;

  for (const i of cells.i) {
    const height = cells.h[i];
    const type = cells.t[i];
    if (height < 20 && type !== -1 && type !== -2) continue; // exclude all deep ocean points
    if (type === -2 && (i % 4 === 0 || features[cells.f[i]].type === 'lake')) continue; // exclude non-coastal lake points
    const [x, y] = points[i];

    addNewPoint(i, x, y, height);

    // add additional points for cells along coast
    if (type === 1 || type === -1) {
      if (cells.b[i]) continue; // not for near-border cells
      cells.c[i].forEach(function (e) {
        if (i > e) return;
        if (cells.t[e] === type) {
          const dist2 = (y - points[e][1]) ** 2 + (x - points[e][0]) ** 2;
          if (dist2 < spacing2) return; // too close to each other
          const x1 = rn((x + points[e][0]) / 2, 1);
          const y1 = rn((y + points[e][1]) / 2, 1);
          addNewPoint(i, x1, y1, height);
        }
      });
    }
  }

  function addNewPoint(i, x, y, height) {
    newCells.p.push([x, y]);
    newCells.g.push(i);
    newCells.h.push(height);
  }

  calculateVoronoi(pack, newCells.p);
  cells = pack.cells;
  cells.p = newCells.p; // points coordinates [x, y]
  cells.g = grid.cells.i.length < 65535 ? Uint16Array.from(newCells.g) : Uint32Array.from(newCells.g); // reference to initial grid cell
  cells.q = d3.quadtree(cells.p.map((p, d) => [p[0], p[1], d])); // points quadtree for fast search
  cells.h = new Uint8Array(newCells.h); // heights
  cells.area = new Uint16Array(cells.i.length); // cell area
  cells.i.forEach((i) => (cells.area[i] = Math.abs(d3.polygonArea(getPackPolygon(i)))));

  TIME && console.timeEnd('reGraph');
}

// Detect and draw the coasline
function drawCoastline() {
  TIME && console.time('drawCoastline');
  reMarkFeatures();

  const cells = pack.cells,
    vertices = pack.vertices,
    n = cells.i.length,
    features = pack.features;
  const used = new Uint8Array(features.length); // store conneted features
  const largestLand = d3.scan(
    features.map((f) => (f.land ? f.cells : 0)),
    (a, b) => b - a
  );
  const landMask = defs.select('#land');
  const waterMask = defs.select('#water');
  lineGen.curve(d3.curveBasisClosed);

  for (const i of cells.i) {
    const startFromEdge = !i && cells.h[i] >= 20;
    if (!startFromEdge && cells.t[i] !== -1 && cells.t[i] !== 1) continue; // non-edge cell
    const f = cells.f[i];
    if (used[f]) continue; // already connected
    if (features[f].type === 'ocean') continue; // ocean cell

    const type = features[f].type === 'lake' ? 1 : -1; // type value to search for
    const start = findStart(i, type);
    if (start === -1) continue; // cannot start here
    let vchain = connectVertices(start, type);
    if (features[f].type === 'lake') relax(vchain, 1.2);
    used[f] = 1;
    let points = clipPoly(
      vchain.map((v) => vertices.p[v]),
      1
    );
    const area = d3.polygonArea(points); // area with lakes/islands
    if (area > 0 && features[f].type === 'lake') {
      points = points.reverse();
      vchain = vchain.reverse();
    }

    features[f].area = Math.abs(area);
    features[f].vertices = vchain;

    const path = round(lineGen(points));
    if (features[f].type === 'lake') {
      landMask
        .append('path')
        .attr('d', path)
        .attr('fill', 'black')
        .attr('id', 'land_' + f);
      // waterMask.append("path").attr("d", path).attr("fill", "white").attr("id", "water_"+id); // uncomment to show over lakes
      lakes
        .select('#freshwater')
        .append('path')
        .attr('d', path)
        .attr('id', 'lake_' + f)
        .attr('data-f', f); // draw the lake
    } else {
      landMask
        .append('path')
        .attr('d', path)
        .attr('fill', 'white')
        .attr('id', 'land_' + f);
      waterMask
        .append('path')
        .attr('d', path)
        .attr('fill', 'black')
        .attr('id', 'water_' + f);
      const g = features[f].group === 'lake_island' ? 'lake_island' : 'sea_island';
      coastline
        .select('#' + g)
        .append('path')
        .attr('d', path)
        .attr('id', 'island_' + f)
        .attr('data-f', f); // draw the coastline
    }

    // draw ruler to cover the biggest land piece
    if (f === largestLand) {
      const from = points[d3.scan(points, (a, b) => a[0] - b[0])];
      const to = points[d3.scan(points, (a, b) => b[0] - a[0])];
      rulers.create(Ruler, [from, to]);
    }
  }

  // find cell vertex to start path detection
  function findStart(i, t) {
    if (t === -1 && cells.b[i]) return cells.v[i].find((v) => vertices.c[v].some((c) => c >= n)); // map border cell
    const filtered = cells.c[i].filter((c) => cells.t[c] === t);
    const index = cells.c[i].indexOf(d3.min(filtered));
    return index === -1 ? index : cells.v[i][index];
  }

  // connect vertices to chain
  function connectVertices(start, t) {
    const chain = []; // vertices chain to form a path
    for (let i = 0, current = start; i === 0 || (current !== start && i < 50000); i++) {
      const prev = chain[chain.length - 1]; // previous vertex in chain
      chain.push(current); // add current vertex to sequence
      const c = vertices.c[current]; // cells adjacent to vertex
      const v = vertices.v[current]; // neighboring vertices
      const c0 = c[0] >= n || cells.t[c[0]] === t;
      const c1 = c[1] >= n || cells.t[c[1]] === t;
      const c2 = c[2] >= n || cells.t[c[2]] === t;
      if (v[0] !== prev && c0 !== c1) current = v[0];
      else if (v[1] !== prev && c1 !== c2) current = v[1];
      else if (v[2] !== prev && c0 !== c2) current = v[2];
      if (current === chain[chain.length - 1]) {
        ERROR && console.error('Next vertex is not found');
        break;
      }
    }
    return chain;
  }

  // move vertices that are too close to already added ones
  function relax(vchain, r) {
    const p = vertices.p,
      tree = d3.quadtree();

    for (let i = 0; i < vchain.length; i++) {
      const v = vchain[i];
      let [x, y] = [p[v][0], p[v][1]];
      if (i && vchain[i + 1] && tree.find(x, y, r) !== undefined) {
        const v1 = vchain[i - 1],
          v2 = vchain[i + 1];
        const [x1, y1] = [p[v1][0], p[v1][1]];
        const [x2, y2] = [p[v2][0], p[v2][1]];
        [x, y] = [(x1 + x2) / 2, (y1 + y2) / 2];
        p[v] = [x, y];
      }
      tree.add([x, y]);
    }
  }

  TIME && console.timeEnd('drawCoastline');
}

// Re-mark features (ocean, lakes, islands)
function reMarkFeatures() {
  TIME && console.time('reMarkFeatures');
  const cells = pack.cells,
    features = (pack.features = [0]);
  cells.f = new Uint16Array(cells.i.length); // cell feature number
  cells.t = new Int8Array(cells.i.length); // cell type: 1 = land along coast; -1 = water along coast;
  cells.haven = cells.i.length < 65535 ? new Uint16Array(cells.i.length) : new Uint32Array(cells.i.length); // cell haven (opposite water cell);
  cells.harbor = new Uint8Array(cells.i.length); // cell harbor (number of adjacent water cells);

  for (let i = 1, queue = [0]; queue[0] !== -1; i++) {
    const start = queue[0]; // first cell
    cells.f[start] = i; // assign feature number
    const land = cells.h[start] >= 20;
    let border = false; // true if feature touches map border
    let cellNumber = 1; // to count cells number in a feature

    while (queue.length) {
      const q = queue.pop();
      if (cells.b[q]) border = true;
      cells.c[q].forEach(function (e) {
        const eLand = cells.h[e] >= 20;
        if (land && !eLand) {
          cells.t[q] = 1;
          cells.t[e] = -1;
          cells.harbor[q]++;
          if (!cells.haven[q]) cells.haven[q] = e;
        } else if (land && eLand) {
          if (!cells.t[e] && cells.t[q] === 1) cells.t[e] = 2;
          else if (!cells.t[q] && cells.t[e] === 1) cells.t[q] = 2;
        }
        if (!cells.f[e] && land === eLand) {
          queue.push(e);
          cells.f[e] = i;
          cellNumber++;
        }
      });
    }

    const type = land ? 'island' : border ? 'ocean' : 'lake';
    let group;
    if (type === 'ocean') group = defineOceanGroup(cellNumber);
    else if (type === 'island') group = defineIslandGroup(start, cellNumber);
    features.push({i, land, border, type, cells: cellNumber, firstCell: start, group});
    queue[0] = cells.f.findIndex((f) => !f); // find unmarked cell
  }

  // markupPackLand
  markup(pack.cells, 3, 1, 0);

  function defineOceanGroup(number) {
    if (number > grid.cells.i.length / 25) return 'ocean';
    if (number > grid.cells.i.length / 100) return 'sea';
    return 'gulf';
  }

  function defineIslandGroup(cell, number) {
    if (cell && features[cells.f[cell - 1]].type === 'lake') return 'lake_island';
    if (number > grid.cells.i.length / 10) return 'continent';
    if (number > grid.cells.i.length / 1000) return 'island';
    return 'isle';
  }

  TIME && console.timeEnd('reMarkFeatures');
}

// assign biome id for each cell
function defineBiomes() {
  TIME && console.time('defineBiomes');
  const cells = pack.cells,
    f = pack.features,
    temp = grid.cells.temp,
    prec = grid.cells.prec;
  cells.biome = new Uint8Array(cells.i.length); // biomes array

  for (const i of cells.i) {
    const t = temp[cells.g[i]]; // cell temperature
    const h = cells.h[i]; // cell height
    const m = h < 20 ? 0 : calculateMoisture(i); // cell moisture
    cells.biome[i] = getBiomeId(m, t, h);
  }

  function calculateMoisture(i) {
    let moist = prec[cells.g[i]];
    if (cells.r[i]) moist += Math.max(cells.fl[i] / 20, 2);
    const n = cells.c[i]
      .filter(isLand)
      .map((c) => prec[cells.g[c]])
      .concat([moist]);
    return rn(4 + d3.mean(n));
  }

  TIME && console.timeEnd('defineBiomes');
}

// assign biome id to a cell
function getBiomeId(moisture, temperature, height) {
  if (temperature < -5) return 11; // permafrost biome, including sea ice
  if (height < 20) return 0; // marine biome: liquid water cells
  if (moisture > 40 && temperature > -2 && (height < 25 || (moisture > 24 && height > 24))) return 12; // wetland biome
  const m = Math.min((moisture / 5) | 0, 4); // moisture band from 0 to 4
  const t = Math.min(Math.max(20 - temperature, 0), 25); // temparature band from 0 to 25
  return biomesData.biomesMartix[m][t];
}

// assess cells suitability to calculate population and rang cells for culture center and burgs placement
function rankCells() {
  TIME && console.time('rankCells');
  const {cells, features} = pack;
  cells.s = new Int16Array(cells.i.length); // cell suitability array
  cells.pop = new Float32Array(cells.i.length); // cell population array

  const flMean = d3.median(cells.fl.filter((f) => f)) || 0;
  const flMax = d3.max(cells.fl) + d3.max(cells.conf); // to normalize flux
  const areaMean = d3.mean(cells.area); // to adjust population by cell area
  const getResValue = (i) => (cells.resource[i] ? Resources.get(cells.resource[i])?.value : 0);
  const resBonuses = [];
  const POP_BALANCER = 1.5; // contant to ballance population to desired number not changing ranking

  for (const i of cells.i) {
    if (cells.b[i]) continue; // avoid adding burgs on map border
    if (cells.h[i] < 20) continue; // no population in water
    let s = biomesData.habitability[cells.biome[i]] / 10; // base suitability derived from biome habitability
    if (!s) continue; // uninhabitable biomes has 0 suitability

    if (flMean) s += normalize(cells.fl[i] + cells.conf[i], flMean, flMax) * 50; // big rivers and confluences are valued
    s -= (cells.h[i] - 50) / 25; // low elevation is valued, high is not;

    if (cells.t[i] === 1) {
      if (cells.r[i]) s += 3; // estuary is valued
      const {type, group} = features[cells.f[cells.haven[i]]];
      if (type === 'lake') {
        if (group === 'freshwater') s += 5;
        else if (group == 'salt') s += 2;
        else if (group == 'dry') s -= 1;
        else if (group == 'sinkhole') s -= 1;
        else if (group == 'lava') s -= 6;
      } else {
        s += 1; // ocean coast is valued
        if (cells.harbor[i] === 1) s += 4; // safe sea harbor is valued
      }
    }

    // add bonus for resources around
    const cellRes = getResValue(i);
    const neibRes = d3.mean(cells.c[i].map((c) => getResValue(c)));
    const resBonus = (cellRes ? cellRes + 10 : 0) + neibRes;
    resBonuses.push(resBonus);

    // cell rural population is suitability adjusted by cell area
    cells.pop[i] = s > 0 ? (s * POP_BALANCER * cells.area[i]) / areaMean : 0;
    cells.s[i] = s + resBonus;

    // debug.append('text').attr('x', cells.p[i][0]).attr('y', cells.p[i][1]).text(cells.s[i]);
  }

  console.log(resBonuses);
  console.log(d3.max(resBonuses));
  console.log(d3.mean(resBonuses));
  console.log(d3.median(resBonuses.map((v) => rn(v))));

  TIME && console.timeEnd('rankCells');
}

// generate some markers
function addMarkers(number = 1) {
  if (!number) return;
  TIME && console.time('addMarkers');
  const cells = pack.cells,
    states = pack.states;

  void (function addVolcanoes() {
    let mounts = Array.from(cells.i)
      .filter((i) => cells.h[i] > 70)
      .sort((a, b) => cells.h[b] - cells.h[a]);
    let count = mounts.length < 10 ? 0 : Math.ceil((mounts.length / 300) * number);
    if (count) addMarker('volcano', '🌋', 52, 50, 13);

    while (count && mounts.length) {
      const cell = mounts.splice(biased(0, mounts.length - 1, 5), 1);
      const x = cells.p[cell][0],
        y = cells.p[cell][1];
      const id = appendMarker(cell, 'volcano');
      const proper = Names.getCulture(cells.culture[cell]);
      const name = P(0.3) ? 'Mount ' + proper : Math.random() > 0.3 ? proper + ' Volcano' : proper;
      notes.push({id, name, legend: `Active volcano. Height: ${getFriendlyHeight([x, y])}`});
      count--;
    }
  })();

  void (function addHotSprings() {
    let springs = Array.from(cells.i)
      .filter((i) => cells.h[i] > 50)
      .sort((a, b) => cells.h[b] - cells.h[a]);
    let count = springs.length < 30 ? 0 : Math.ceil((springs.length / 1000) * number);
    if (count) addMarker('hot_springs', '♨️', 50, 52, 12.5);

    while (count && springs.length) {
      const cell = springs.splice(biased(1, springs.length - 1, 3), 1);
      const id = appendMarker(cell, 'hot_springs');
      const proper = Names.getCulture(cells.culture[cell]);
      const temp = convertTemperature(gauss(30, 15, 20, 100));
      notes.push({id, name: proper + ' Hot Springs', legend: `A hot springs area. Temperature: ${temp}`});
      count--;
    }
  })();

  void (function addMines() {
    let hills = Array.from(cells.i).filter((i) => cells.h[i] > 47 && cells.burg[i]);
    let count = !hills.length ? 0 : Math.ceil((hills.length / 7) * number);
    if (!count) return;

    addMarker('mine', '⛏️', 48, 50, 13.5);
    const resources = {salt: 5, gold: 2, silver: 4, copper: 2, iron: 3, lead: 1, tin: 1};

    while (count && hills.length) {
      const cell = hills.splice(Math.floor(Math.random() * hills.length), 1);
      const id = appendMarker(cell, 'mine');
      const resource = rw(resources);
      const burg = pack.burgs[cells.burg[cell]];
      const name = `${burg.name} — ${resource} mining town`;
      const population = rn(burg.population * populationRate * urbanization);
      const legend = `${burg.name} is a mining town of ${population} people just nearby the ${resource} mine`;
      notes.push({id, name, legend});
      count--;
    }
  })();

  void (function addBridges() {
    const meanRoad = d3.mean(cells.road.filter((r) => r));
    const meanFlux = d3.mean(cells.fl.filter((fl) => fl));

    let bridges = Array.from(cells.i)
      .filter((i) => cells.burg[i] && cells.h[i] >= 20 && cells.r[i] && cells.fl[i] > meanFlux && cells.road[i] > meanRoad)
      .sort((a, b) => cells.road[b] + cells.fl[b] / 10 - (cells.road[a] + cells.fl[a] / 10));

    let count = !bridges.length ? 0 : Math.ceil((bridges.length / 12) * number);
    if (count) addMarker('bridge', '🌉', 50, 50, 14);

    while (count && bridges.length) {
      const cell = bridges.splice(0, 1);
      const id = appendMarker(cell, 'bridge');
      const burg = pack.burgs[cells.burg[cell]];
      const river = pack.rivers.find((r) => r.i === pack.cells.r[cell]);
      const riverName = river ? `${river.name} ${river.type}` : 'river';
      const name = river && P(0.2) ? river.name : burg.name;
      notes.push({id, name: `${name} Bridge`, legend: `A stone bridge over the ${riverName} near ${burg.name}`});
      count--;
    }
  })();

  void (function addInns() {
    const maxRoad = d3.max(cells.road) * 0.9;
    let taverns = Array.from(cells.i).filter((i) => cells.crossroad[i] && cells.h[i] >= 20 && cells.road[i] > maxRoad);
    if (!taverns.length) return;
    const count = Math.ceil(4 * number);
    addMarker('inn', '🍻', 50, 50, 14.5);

    const color = ['Dark', 'Light', 'Bright', 'Golden', 'White', 'Black', 'Red', 'Pink', 'Purple', 'Blue', 'Green', 'Yellow', 'Amber', 'Orange', 'Brown', 'Grey'];
    const animal = [
      'Antelope',
      'Ape',
      'Badger',
      'Bear',
      'Beaver',
      'Bison',
      'Boar',
      'Buffalo',
      'Cat',
      'Crane',
      'Crocodile',
      'Crow',
      'Deer',
      'Dog',
      'Eagle',
      'Elk',
      'Fox',
      'Goat',
      'Goose',
      'Hare',
      'Hawk',
      'Heron',
      'Horse',
      'Hyena',
      'Ibis',
      'Jackal',
      'Jaguar',
      'Lark',
      'Leopard',
      'Lion',
      'Mantis',
      'Marten',
      'Moose',
      'Mule',
      'Narwhal',
      'Owl',
      'Panther',
      'Rat',
      'Raven',
      'Rook',
      'Scorpion',
      'Shark',
      'Sheep',
      'Snake',
      'Spider',
      'Swan',
      'Tiger',
      'Turtle',
      'Wolf',
      'Wolverine',
      'Camel',
      'Falcon',
      'Hound',
      'Ox'
    ];
    const adj = [
      'New',
      'Good',
      'High',
      'Old',
      'Great',
      'Big',
      'Major',
      'Happy',
      'Main',
      'Huge',
      'Far',
      'Beautiful',
      'Fair',
      'Prime',
      'Ancient',
      'Golden',
      'Proud',
      'Lucky',
      'Fat',
      'Honest',
      'Giant',
      'Distant',
      'Friendly',
      'Loud',
      'Hungry',
      'Magical',
      'Superior',
      'Peaceful',
      'Frozen',
      'Divine',
      'Favorable',
      'Brave',
      'Sunny',
      'Flying'
    ];

    for (let i = 0; i < taverns.length && i < count; i++) {
      const cell = taverns.splice(Math.floor(Math.random() * taverns.length), 1);
      const id = appendMarker(cell, 'inn');
      const type = P(0.3) ? 'inn' : 'tavern';
      const name = P(0.5) ? ra(color) + ' ' + ra(animal) : P(0.6) ? ra(adj) + ' ' + ra(animal) : ra(adj) + ' ' + capitalize(type);
      notes.push({id, name: 'The ' + name, legend: `A big and famous roadside ${type}`});
    }
  })();

  void (function addLighthouses() {
    const lands = cells.i.filter((i) => cells.harbor[i] > 6 && cells.c[i].some((c) => cells.h[c] < 20 && cells.road[c]));
    const lighthouses = Array.from(lands).map((i) => [i, cells.v[i][cells.c[i].findIndex((c) => cells.h[c] < 20 && cells.road[c])]]);
    if (lighthouses.length) addMarker('lighthouse', '🚨', 50, 50, 16);
    const count = Math.ceil(4 * number);

    for (let i = 0; i < lighthouses.length && i < count; i++) {
      const cell = lighthouses[i][0],
        vertex = lighthouses[i][1];
      const id = appendMarker(cell, 'lighthouse');
      const proper = cells.burg[cell] ? pack.burgs[cells.burg[cell]].name : Names.getCulture(cells.culture[cell]);
      notes.push({id, name: getAdjective(proper) + ' Lighthouse' + name, legend: `A lighthouse to keep the navigation safe`});
    }
  })();

  void (function addWaterfalls() {
    const waterfalls = cells.i.filter((i) => cells.r[i] && cells.h[i] > 70);
    if (waterfalls.length) addMarker('waterfall', '⟱', 50, 54, 16.5);
    const count = Math.ceil(3 * number);

    for (let i = 0; i < waterfalls.length && i < count; i++) {
      const cell = waterfalls[i];
      const id = appendMarker(cell, 'waterfall');
      const proper = cells.burg[cell] ? pack.burgs[cells.burg[cell]].name : Names.getCulture(cells.culture[cell]);
      notes.push({id, name: getAdjective(proper) + ' Waterfall' + name, legend: `An extremely beautiful waterfall`});
    }
  })();

  void (function addBattlefields() {
    let battlefields = Array.from(cells.i).filter((i) => cells.state[i] && cells.pop[i] > 2 && cells.h[i] < 50 && cells.h[i] > 25);
    let count = battlefields.length < 100 ? 0 : Math.ceil((battlefields.length / 500) * number);
    if (count) addMarker('battlefield', '⚔️', 50, 52, 12);

    while (count && battlefields.length) {
      const cell = battlefields.splice(Math.floor(Math.random() * battlefields.length), 1);
      const id = appendMarker(cell, 'battlefield');
      const campaign = ra(states[cells.state[cell]].campaigns);
      const date = generateDate(campaign.start, campaign.end);
      const name = Names.getCulture(cells.culture[cell]) + ' Battlefield';
      const legend = `A historical battle of the ${campaign.name}. \r\nDate: ${date} ${options.era}`;
      notes.push({id, name, legend});
      count--;
    }
  })();

  function addMarker(id, icon, x, y, size) {
    const markers = svg.select('#defs-markers');
    if (markers.select('#marker_' + id).size()) return;

    const symbol = markers
      .append('symbol')
      .attr('id', 'marker_' + id)
      .attr('viewBox', '0 0 30 30');
    symbol.append('path').attr('d', 'M6,19 l9,10 L24,19').attr('fill', '#000000').attr('stroke', 'none');
    symbol.append('circle').attr('cx', 15).attr('cy', 15).attr('r', 10).attr('fill', '#ffffff').attr('stroke', '#000000').attr('stroke-width', 1);
    symbol
      .append('text')
      .attr('x', x + '%')
      .attr('y', y + '%')
      .attr('fill', '#000000')
      .attr('stroke', '#3200ff')
      .attr('stroke-width', 0)
      .attr('font-size', size + 'px')
      .attr('dominant-baseline', 'central')
      .text(icon);
  }

  function appendMarker(cell, type) {
    const x = cells.p[cell][0],
      y = cells.p[cell][1];
    const id = getNextId('markerElement');
    const name = '#marker_' + type;

    markers
      .append('use')
      .attr('id', id)
      .attr('xlink:href', name)
      .attr('data-id', name)
      .attr('data-x', x)
      .attr('data-y', y)
      .attr('x', x - 15)
      .attr('y', y - 30)
      .attr('data-size', 1)
      .attr('width', 30)
      .attr('height', 30);

    return id;
  }

  TIME && console.timeEnd('addMarkers');
}

// regenerate some zones
function addZones(number = 1) {
  TIME && console.time('addZones');
  const data = [],
    cells = pack.cells,
    states = pack.states,
    burgs = pack.burgs;
  const used = new Uint8Array(cells.i.length); // to store used cells

  for (let i = 0; i < rn(Math.random() * 1.8 * number); i++) addInvasion(); // invasion of enemy lands
  for (let i = 0; i < rn(Math.random() * 1.6 * number); i++) addRebels(); // rebels along a state border
  for (let i = 0; i < rn(Math.random() * 1.6 * number); i++) addProselytism(); // proselitism of organized religion
  for (let i = 0; i < rn(Math.random() * 1.6 * number); i++) addCrusade(); // crusade on heresy lands
  for (let i = 0; i < rn(Math.random() * 1.8 * number); i++) addDisease(); // disease starting in a random city
  for (let i = 0; i < rn(Math.random() * 1.4 * number); i++) addDisaster(); // disaster starting in a random city
  for (let i = 0; i < rn(Math.random() * 1.4 * number); i++) addEruption(); // volcanic eruption aroung volcano
  for (let i = 0; i < rn(Math.random() * 1.0 * number); i++) addAvalanche(); // avalanche impacting highland road
  for (let i = 0; i < rn(Math.random() * 1.4 * number); i++) addFault(); // fault line in elevated areas
  for (let i = 0; i < rn(Math.random() * 1.4 * number); i++) addFlood(); // flood on river banks
  for (let i = 0; i < rn(Math.random() * 1.2 * number); i++) addTsunami(); // tsunami starting near coast

  function addInvasion() {
    const atWar = states.filter((s) => s.diplomacy && s.diplomacy.some((d) => d === 'Enemy'));
    if (!atWar.length) return;

    const invader = ra(atWar);
    const target = invader.diplomacy.findIndex((d) => d === 'Enemy');

    const cell = ra(cells.i.filter((i) => cells.state[i] === target && cells.c[i].some((c) => cells.state[c] === invader.i)));
    if (!cell) return;

    const cellsArray = [],
      queue = [cell],
      power = rand(5, 30);

    while (queue.length) {
      const q = P(0.4) ? queue.shift() : queue.pop();
      cellsArray.push(q);
      if (cellsArray.length > power) break;

      cells.c[q].forEach((e) => {
        if (used[e]) return;
        if (cells.state[e] !== target) return;
        used[e] = 1;
        queue.push(e);
      });
    }

    const invasion = rw({Invasion: 4, Occupation: 3, Raid: 2, Conquest: 2, Subjugation: 1, Foray: 1, Skirmishes: 1, Incursion: 2, Pillaging: 1, Intervention: 1});
    const name = getAdjective(invader.name) + ' ' + invasion;
    data.push({name, type: 'Invasion', cells: cellsArray, fill: 'url(#hatch1)'});
  }

  function addRebels() {
    const state = ra(states.filter((s) => s.i && s.neighbors.some((n) => n)));
    if (!state) return;

    const neib = ra(state.neighbors.filter((n) => n));
    const cell = cells.i.find((i) => cells.state[i] === state.i && cells.c[i].some((c) => cells.state[c] === neib));
    const cellsArray = [],
      queue = [cell],
      power = rand(10, 30);

    while (queue.length) {
      const q = queue.shift();
      cellsArray.push(q);
      if (cellsArray.length > power) break;

      cells.c[q].forEach((e) => {
        if (used[e]) return;
        if (cells.state[e] !== state.i) return;
        used[e] = 1;
        if (e % 4 !== 0 && !cells.c[e].some((c) => cells.state[c] === neib)) return;
        queue.push(e);
      });
    }

    const rebels = rw({Rebels: 5, Insurgents: 2, Mutineers: 1, Rioters: 1, Separatists: 1, Secessionists: 1, Insurrection: 2, Rebellion: 1, Conspiracy: 2});
    const name = getAdjective(states[neib].name) + ' ' + rebels;
    data.push({name, type: 'Rebels', cells: cellsArray, fill: 'url(#hatch3)'});
  }

  function addProselytism() {
    const organized = ra(pack.religions.filter((r) => r.type === 'Organized'));
    if (!organized) return;

    const cell = ra(cells.i.filter((i) => cells.religion[i] && cells.religion[i] !== organized.i && cells.c[i].some((c) => cells.religion[c] === organized.i)));
    if (!cell) return;
    const target = cells.religion[cell];
    const cellsArray = [],
      queue = [cell],
      power = rand(10, 30);

    while (queue.length) {
      const q = queue.shift();
      cellsArray.push(q);
      if (cellsArray.length > power) break;

      cells.c[q].forEach((e) => {
        if (used[e]) return;
        if (cells.religion[e] !== target) return;
        if (cells.h[e] < 20) return;
        used[e] = 1;
        //if (e%2 !== 0 && !cells.c[e].some(c => cells.state[c] === neib)) return;
        queue.push(e);
      });
    }

    const name = getAdjective(organized.name.split(' ')[0]) + ' Proselytism';
    data.push({name, type: 'Proselytism', cells: cellsArray, fill: 'url(#hatch6)'});
  }

  function addCrusade() {
    const heresy = ra(pack.religions.filter((r) => r.type === 'Heresy'));
    if (!heresy) return;

    const cellsArray = cells.i.filter((i) => !used[i] && cells.religion[i] === heresy.i);
    if (!cellsArray.length) return;
    cellsArray.forEach((i) => (used[i] = 1));

    const name = getAdjective(heresy.name.split(' ')[0]) + ' Crusade';
    data.push({name, type: 'Crusade', cells: cellsArray, fill: 'url(#hatch6)'});
  }

  function addDisease() {
    const burg = ra(burgs.filter((b) => !used[b.cell] && b.i && !b.removed)); // random burg
    if (!burg) return;

    const cellsArray = [],
      cost = [],
      power = rand(20, 37);
    const queue = new PriorityQueue({comparator: (a, b) => a.p - b.p});
    queue.queue({e: burg.cell, p: 0});

    while (queue.length) {
      const next = queue.dequeue();
      if (cells.burg[next.e] || cells.pop[next.e]) cellsArray.push(next.e);
      used[next.e] = 1;

      cells.c[next.e].forEach(function (e) {
        const r = cells.road[next.e];
        const c = r ? Math.max(10 - r, 1) : 100;
        const p = next.p + c;
        if (p > power) return;

        if (!cost[e] || p < cost[e]) {
          cost[e] = p;
          queue.queue({e, p});
        }
      });
    }

    const adjective = () => ra(['Great', 'Silent', 'Severe', 'Blind', 'Unknown', 'Loud', 'Deadly', 'Burning', 'Bloody', 'Brutal', 'Fatal']);
    const animal = () => ra(['Ape', 'Bear', 'Boar', 'Cat', 'Cow', 'Dog', 'Pig', 'Fox', 'Bird', 'Horse', 'Rat', 'Raven', 'Sheep', 'Spider', 'Wolf']);
    const color = () => ra(['Golden', 'White', 'Black', 'Red', 'Pink', 'Purple', 'Blue', 'Green', 'Yellow', 'Amber', 'Orange', 'Brown', 'Grey']);

    const type = rw({Fever: 5, Pestilence: 2, Flu: 2, Pox: 2, Smallpox: 2, Plague: 4, Cholera: 2, Dropsy: 1, Leprosy: 2});
    const name = rw({[color()]: 4, [animal()]: 2, [adjective()]: 1}) + ' ' + type;
    data.push({name, type: 'Disease', cells: cellsArray, fill: 'url(#hatch12)'});
  }

  function addDisaster() {
    const burg = ra(burgs.filter((b) => !used[b.cell] && b.i && !b.removed)); // random burg
    if (!burg) return;

    const cellsArray = [],
      cost = [],
      power = rand(5, 25);
    const queue = new PriorityQueue({comparator: (a, b) => a.p - b.p});
    queue.queue({e: burg.cell, p: 0});

    while (queue.length) {
      const next = queue.dequeue();
      if (cells.burg[next.e] || cells.pop[next.e]) cellsArray.push(next.e);
      used[next.e] = 1;

      cells.c[next.e].forEach(function (e) {
        const c = rand(1, 10);
        const p = next.p + c;
        if (p > power) return;

        if (!cost[e] || p < cost[e]) {
          cost[e] = p;
          queue.queue({e, p});
        }
      });
    }

    const type = rw({Famine: 5, Dearth: 1, Drought: 3, Earthquake: 3, Tornadoes: 1, Wildfires: 1});
    const name = getAdjective(burg.name) + ' ' + type;
    data.push({name, type: 'Disaster', cells: cellsArray, fill: 'url(#hatch5)'});
  }

  function addEruption() {
    const volcano = document.getElementById('markers').querySelector("use[data-id='#marker_volcano']");
    if (!volcano) return;

    const x = +volcano.dataset.x,
      y = +volcano.dataset.y,
      cell = findCell(x, y);
    const id = volcano.id;
    const note = notes.filter((n) => n.id === id);

    if (note[0]) note[0].legend = note[0].legend.replace('Active volcano', 'Erupting volcano');
    const name = note[0] ? note[0].name.replace(' Volcano', '') + ' Eruption' : 'Volcano Eruption';

    const cellsArray = [],
      queue = [cell],
      power = rand(10, 30);

    while (queue.length) {
      const q = P(0.5) ? queue.shift() : queue.pop();
      cellsArray.push(q);
      if (cellsArray.length > power) break;
      cells.c[q].forEach((e) => {
        if (used[e] || cells.h[e] < 20) return;
        used[e] = 1;
        queue.push(e);
      });
    }

    data.push({name, type: 'Disaster', cells: cellsArray, fill: 'url(#hatch7)'});
  }

  function addAvalanche() {
    const roads = cells.i.filter((i) => !used[i] && cells.road[i] && cells.h[i] >= 70);
    if (!roads.length) return;

    const cell = +ra(roads);
    const cellsArray = [],
      queue = [cell],
      power = rand(3, 15);

    while (queue.length) {
      const q = P(0.3) ? queue.shift() : queue.pop();
      cellsArray.push(q);
      if (cellsArray.length > power) break;
      cells.c[q].forEach((e) => {
        if (used[e] || cells.h[e] < 65) return;
        used[e] = 1;
        queue.push(e);
      });
    }

    const proper = getAdjective(Names.getCultureShort(cells.culture[cell]));
    const name = proper + ' Avalanche';
    data.push({name, type: 'Disaster', cells: cellsArray, fill: 'url(#hatch5)'});
  }

  function addFault() {
    const elevated = cells.i.filter((i) => !used[i] && cells.h[i] > 50 && cells.h[i] < 70);
    if (!elevated.length) return;

    const cell = ra(elevated);
    const cellsArray = [],
      queue = [cell],
      power = rand(3, 15);

    while (queue.length) {
      const q = queue.pop();
      if (cells.h[q] >= 20) cellsArray.push(q);
      if (cellsArray.length > power) break;
      cells.c[q].forEach((e) => {
        if (used[e] || cells.r[e]) return;
        used[e] = 1;
        queue.push(e);
      });
    }

    const proper = getAdjective(Names.getCultureShort(cells.culture[cell]));
    const name = proper + ' Fault';
    data.push({name, type: 'Disaster', cells: cellsArray, fill: 'url(#hatch2)'});
  }

  function addFlood() {
    const fl = cells.fl.filter((fl) => fl),
      meanFlux = d3.mean(fl),
      maxFlux = d3.max(fl),
      flux = (maxFlux - meanFlux) / 2 + meanFlux;
    const rivers = cells.i.filter((i) => !used[i] && cells.h[i] < 50 && cells.r[i] && cells.fl[i] > flux && cells.burg[i]);
    if (!rivers.length) return;

    const cell = +ra(rivers),
      river = cells.r[cell];
    const cellsArray = [],
      queue = [cell],
      power = rand(5, 30);

    while (queue.length) {
      const q = queue.pop();
      cellsArray.push(q);
      if (cellsArray.length > power) break;

      cells.c[q].forEach((e) => {
        if (used[e] || cells.h[e] < 20 || cells.r[e] !== river || cells.h[e] > 50 || cells.fl[e] < meanFlux) return;
        used[e] = 1;
        queue.push(e);
      });
    }

    const name = getAdjective(burgs[cells.burg[cell]].name) + ' Flood';
    data.push({name, type: 'Disaster', cells: cellsArray, fill: 'url(#hatch13)'});
  }

  function addTsunami() {
    const coastal = cells.i.filter((i) => !used[i] && cells.t[i] === -1 && pack.features[cells.f[i]].type !== 'lake');
    if (!coastal.length) return;

    const cell = +ra(coastal);
    const cellsArray = [],
      queue = [cell],
      power = rand(10, 30);

    while (queue.length) {
      const q = queue.shift();
      if (cells.t[q] === 1) cellsArray.push(q);
      if (cellsArray.length > power) break;

      cells.c[q].forEach((e) => {
        if (used[e]) return;
        if (cells.t[e] > 2) return;
        if (pack.features[cells.f[e]].type === 'lake') return;
        used[e] = 1;
        queue.push(e);
      });
    }

    const proper = getAdjective(Names.getCultureShort(cells.culture[cell]));
    const name = proper + ' Tsunami';
    data.push({name, type: 'Disaster', cells: cellsArray, fill: 'url(#hatch13)'});
  }

  void (function drawZones() {
    zones
      .selectAll('g')
      .data(data)
      .enter()
      .append('g')
      .attr('id', (d, i) => 'zone' + i)
      .attr('data-description', (d) => d.name)
      .attr('data-type', (d) => d.type)
      .attr('data-cells', (d) => d.cells.join(','))
      .attr('fill', (d) => d.fill)
      .selectAll('polygon')
      .data((d) => d.cells)
      .enter()
      .append('polygon')
      .attr('points', (d) => getPackPolygon(d))
      .attr('id', function (d) {
        return this.parentNode.id + '_' + d;
      });
  })();

  TIME && console.timeEnd('addZones');
}

// show map stats on generation complete
function showStatistics() {
  const template = templateInput.value;
  const templateRandom = locked('template') ? '' : '(random)';
  const stats = `  Seed: ${seed}
    Canvas size: ${graphWidth}x${graphHeight}
    Template: ${template} ${templateRandom}
    Points: ${grid.points.length}
    Cells: ${pack.cells.i.length}
    Map size: ${mapSizeOutput.value}%
    States: ${pack.states.length - 1}
    Provinces: ${pack.provinces.length - 1}
    Burgs: ${pack.burgs.length - 1}
    Religions: ${pack.religions.length - 1}
    Culture set: ${culturesSet.selectedOptions[0].innerText}
    Cultures: ${pack.cultures.length - 1}`;

  mapId = Date.now(); // unique map id is it's creation date number
  mapHistory.push({seed, width: graphWidth, height: graphHeight, template, created: mapId});
  INFO && console.log(stats);
}

const regenerateMap = debounce(function () {
  WARN && console.warn('Generate new random map');
  closeDialogs('#worldConfigurator, #options3d');
  customization = 0;
  undraw();
  resetZoom(1000);
  generate();
  restoreLayers();
  if (ThreeD.options.isOn) ThreeD.redraw();
  if ($('#worldConfigurator').is(':visible')) editWorld();
}, 500);

// clear the map
function undraw() {
  viewbox.selectAll('path, circle, polygon, line, text, use, #zones > g, #armies > g, #ruler > g').remove();
  document
    .getElementById('deftemp')
    .querySelectorAll('path, clipPath, svg')
    .forEach((el) => el.remove());
  document.getElementById('coas').innerHTML = ''; // remove auto-generated emblems
  notes = [];
  rulers = new Rulers();
  unfog();
}