"use strict";
// Functions to export map to image or data files

// download map as SVG
async function saveSVG() {
  TIME && console.time("saveSVG");
  const url = await getMapURL("svg", {fullMap: true});
  const link = document.createElement("a");
  link.download = getFileName() + ".svg";
  link.href = url;
  link.click();

  tip(
    `${link.download} is saved. Open "Downloads" screen (ctrl + J) to check. You can set image scale in options`,
    true,
    "success",
    5000
  );
  TIME && console.timeEnd("saveSVG");
}

// download map as PNG
async function savePNG() {
  TIME && console.time("savePNG");
  const url = await getMapURL("png");

  const link = document.createElement("a");
  const canvas = document.createElement("canvas");
  const ctx = canvas.getContext("2d");
  canvas.width = svgWidth * pngResolutionInput.value;
  canvas.height = svgHeight * pngResolutionInput.value;
  const img = new Image();
  img.src = url;

  img.onload = function () {
    ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
    link.download = getFileName() + ".png";
    canvas.toBlob(function (blob) {
      link.href = window.URL.createObjectURL(blob);
      link.click();
      window.setTimeout(function () {
        canvas.remove();
        window.URL.revokeObjectURL(link.href);
        tip(
          `${link.download} is saved. Open "Downloads" screen (crtl + J) to check. You can set image scale in options`,
          true,
          "success",
          5000
        );
      }, 1000);
    });
  };

  TIME && console.timeEnd("savePNG");
}

// download map as JPEG
async function saveJPEG() {
  TIME && console.time("saveJPEG");
  const url = await getMapURL("png");

  const canvas = document.createElement("canvas");
  canvas.width = svgWidth * pngResolutionInput.value;
  canvas.height = svgHeight * pngResolutionInput.value;
  const img = new Image();
  img.src = url;

  img.onload = async function () {
    canvas.getContext("2d").drawImage(img, 0, 0, canvas.width, canvas.height);
    const quality = Math.min(rn(1 - pngResolutionInput.value / 20, 2), 0.92);
    const URL = await canvas.toDataURL("image/jpeg", quality);
    const link = document.createElement("a");
    link.download = getFileName() + ".jpeg";
    link.href = URL;
    link.click();
    tip(`${link.download} is saved. Open "Downloads" screen (CTRL + J) to check`, true, "success", 7000);
    window.setTimeout(() => window.URL.revokeObjectURL(URL), 5000);
  };

  TIME && console.timeEnd("saveJPEG");
}

// download map as png tiles
async function saveTiles() {
  return new Promise(async (resolve, reject) => {
    // download schema
    const urlSchema = await getMapURL("tiles", {debug: true, fullMap: true});
    await import("../../libs/jszip.min.js");
    const zip = new window.JSZip();

    const canvas = document.createElement("canvas");
    const ctx = canvas.getContext("2d");
    canvas.width = graphWidth;
    canvas.height = graphHeight;

    const imgSchema = new Image();
    imgSchema.src = urlSchema;
    imgSchema.onload = function () {
      ctx.drawImage(imgSchema, 0, 0, canvas.width, canvas.height);
      canvas.toBlob(blob => zip.file(`fmg_tile_schema.png`, blob));
    };

    // download tiles
    const url = await getMapURL("tiles", {fullMap: true});
    const tilesX = +document.getElementById("tileColsInput").value;
    const tilesY = +document.getElementById("tileRowsInput").value;
    const scale = +document.getElementById("tileScaleInput").value;

    const tileW = (graphWidth / tilesX) | 0;
    const tileH = (graphHeight / tilesY) | 0;
    const tolesTotal = tilesX * tilesY;

    const width = graphWidth * scale;
    const height = width * (tileH / tileW);
    canvas.width = width;
    canvas.height = height;

    let loaded = 0;
    const img = new Image();
    img.src = url;
    img.onload = function () {
      for (let y = 0, i = 0; y + tileH <= graphHeight; y += tileH) {
        for (let x = 0; x + tileW <= graphWidth; x += tileW, i++) {
          ctx.drawImage(img, x, y, tileW, tileH, 0, 0, width, height);
          const name = `fmg_tile_${i}.png`;
          canvas.toBlob(blob => {
            zip.file(name, blob);
            loaded += 1;
            if (loaded === tolesTotal) return downloadZip();
          });
        }
      }
    };

    function downloadZip() {
      const name = `${getFileName()}.zip`;
      zip.generateAsync({type: "blob"}).then(blob => {
        const link = document.createElement("a");
        link.href = URL.createObjectURL(blob);
        link.download = name;
        link.click();
        link.remove();

        setTimeout(() => URL.revokeObjectURL(link.href), 5000);
        resolve(true);
      });
    }
  });
}

// parse map svg to object url
async function getMapURL(type, options = {}) {
  const {
    debug = false,
    globe = false,
    noLabels = false,
    noWater = false,
    noScaleBar = false,
    noIce = false,
    fullMap = false
  } = options;

  if (fullMap) drawScaleBar(1);

  const cloneEl = document.getElementById("map").cloneNode(true); // clone svg
  cloneEl.id = "fantasyMap";
  document.body.appendChild(cloneEl);
  const clone = d3.select(cloneEl);
  if (!debug) clone.select("#debug")?.remove();

  const cloneDefs = cloneEl.getElementsByTagName("defs")[0];
  const svgDefs = document.getElementById("defElements");

  const isFirefox = navigator.userAgent.toLowerCase().indexOf("firefox") > -1;
  if (isFirefox && type === "mesh") clone.select("#oceanPattern")?.remove();
  if (globe) clone.select("#scaleBar")?.remove();
  if (noLabels) {
    clone.select("#labels #states")?.remove();
    clone.select("#labels #burgLabels")?.remove();
    clone.select("#icons #burgIcons")?.remove();
  }
  if (noWater) {
    clone.select("#oceanBase").attr("opacity", 0);
    clone.select("#oceanPattern").attr("opacity", 0);
  }
  if (noScaleBar) clone.select("#scaleBar")?.remove();
  if (noIce) clone.select("#ice")?.remove();
  if (fullMap) {
    // reset transform to show the whole map
    clone.attr("width", graphWidth).attr("height", graphHeight);
    clone.select("#viewbox").attr("transform", null);
    drawScaleBar(scale);
  }

  if (type === "svg") removeUnusedElements(clone);
  if (customization && type === "mesh") updateMeshCells(clone);
  inlineStyle(clone);

  // remove unused filters
  const filters = cloneEl.querySelectorAll("filter");
  for (let i = 0; i < filters.length; i++) {
    const id = filters[i].id;
    if (cloneEl.querySelector("[filter='url(#" + id + ")']")) continue;
    if (cloneEl.getAttribute("filter") === "url(#" + id + ")") continue;
    filters[i].remove();
  }

  // remove unused patterns
  const patterns = cloneEl.querySelectorAll("pattern");
  for (let i = 0; i < patterns.length; i++) {
    const id = patterns[i].id;
    if (cloneEl.querySelector("[fill='url(#" + id + ")']")) continue;
    patterns[i].remove();
  }

  // remove unused symbols
  const symbols = cloneEl.querySelectorAll("symbol");
  for (let i = 0; i < symbols.length; i++) {
    const id = symbols[i].id;
    if (cloneEl.querySelector("use[*|href='#" + id + "']")) continue;
    symbols[i].remove();
  }

  // add displayed emblems
  if (layerIsOn("toggleEmblems") && emblems.selectAll("use").size()) {
    cloneEl
      .getElementById("emblems")
      ?.querySelectorAll("use")
      .forEach(el => {
        const href = el.getAttribute("href") || el.getAttribute("xlink:href");
        if (!href) return;
        const emblem = document.getElementById(href.slice(1));
        if (emblem) cloneDefs.append(emblem.cloneNode(true));
      });
  } else {
    cloneDefs.querySelector("#defs-emblems")?.remove();
  }

  // replace ocean pattern href to base64
  if (location.hostname) {
    const el = cloneEl.getElementById("oceanicPattern");
    const url = el?.getAttribute("href");
    if (url) {
      await new Promise(resolve => {
        getBase64(url, base64 => {
          el.setAttribute("href", base64);
          resolve();
        });
      });
    }
  }

  // replace texture href to base64
  if (location.hostname) {
    const el = cloneEl.getElementById("textureImage");
    const url = el?.getAttribute("href");
    if (url) {
      await new Promise(resolve => {
        getBase64(url, base64 => {
          el.setAttribute("href", base64);
          resolve();
        });
      });
    }
  }

  // add relief icons
  if (cloneEl.getElementById("terrain")) {
    const uniqueElements = new Set();
    const terrainNodes = cloneEl.getElementById("terrain").childNodes;
    for (let i = 0; i < terrainNodes.length; i++) {
      const href = terrainNodes[i].getAttribute("href") || terrainNodes[i].getAttribute("xlink:href");
      uniqueElements.add(href);
    }

    const defsRelief = svgDefs.getElementById("defs-relief");
    for (const terrain of [...uniqueElements]) {
      const element = defsRelief.querySelector(terrain);
      if (element) cloneDefs.appendChild(element.cloneNode(true));
    }
  }

  // add wind rose
  if (cloneEl.getElementById("compass")) {
    const rose = svgDefs.getElementById("rose");
    if (rose) cloneDefs.appendChild(rose.cloneNode(true));
  }

  // add port icon
  if (cloneEl.getElementById("anchors")) {
    const anchor = svgDefs.getElementById("icon-anchor");
    if (anchor) cloneDefs.appendChild(anchor.cloneNode(true));
  }

  // add grid pattern
  if (cloneEl.getElementById("gridOverlay")?.hasChildNodes()) {
    const type = cloneEl.getElementById("gridOverlay").getAttribute("type");
    const pattern = svgDefs.getElementById("pattern_" + type);
    if (pattern) cloneDefs.appendChild(pattern.cloneNode(true));
  }

  if (!cloneEl.getElementById("fogging-cont")) cloneEl.getElementById("fog")?.remove(); // remove unused fog
  if (!cloneEl.getElementById("regions")) cloneEl.getElementById("statePaths")?.remove(); // removed unused statePaths
  if (!cloneEl.getElementById("labels")) cloneEl.getElementById("textPaths")?.remove(); // removed unused textPaths

  // add armies style
  if (cloneEl.getElementById("armies")) {
    cloneEl.insertAdjacentHTML(
      "afterbegin",
      "<style>#armies text {stroke: none; fill: #fff; text-shadow: 0 0 4px #000; dominant-baseline: central; text-anchor: middle; font-family: Helvetica; fill-opacity: 1;}#armies text.regimentIcon {font-size: .8em;}</style>"
    );
  }

  // add xlink: for href to support svg 1.1
  if (type === "svg") {
    cloneEl.querySelectorAll("[href]").forEach(el => {
      const href = el.getAttribute("href");
      el.removeAttribute("href");
      el.setAttribute("xlink:href", href);
    });
  }

  // add hatchings
  const hatchingUsers = cloneEl.querySelectorAll(`[fill^='url(#hatch']`);
  const hatchingFills = unique(Array.from(hatchingUsers).map(el => el.getAttribute("fill")));
  const hatchingIds = hatchingFills.map(fill => fill.slice(5, -1));
  for (const hatchingId of hatchingIds) {
    const hatching = svgDefs.getElementById(hatchingId);
    if (hatching) cloneDefs.appendChild(hatching.cloneNode(true));
  }

  // load fonts
  const usedFonts = getUsedFonts(cloneEl);
  const fontsToLoad = usedFonts.filter(font => font.src);
  if (fontsToLoad.length) {
    const dataURLfonts = await loadFontsAsDataURI(fontsToLoad);

    const fontFaces = dataURLfonts
      .map(({family, src, unicodeRange = "", variant = "normal"}) => {
        return `@font-face {font-family: "${family}"; src: ${src}; unicode-range: ${unicodeRange}; font-variant: ${variant};}`;
      })
      .join("\n");

    const style = document.createElement("style");
    style.setAttribute("type", "text/css");
    style.innerHTML = fontFaces;
    cloneEl.querySelector("defs").appendChild(style);
  }

  clone.remove();

  const serialized =
    `<?xml version="1.0" encoding="UTF-8" standalone="no"?>` + new XMLSerializer().serializeToString(cloneEl);
  const blob = new Blob([serialized], {type: "image/svg+xml;charset=utf-8"});
  const url = window.URL.createObjectURL(blob);
  window.setTimeout(() => window.URL.revokeObjectURL(url), 5000);
  return url;
}

// remove hidden g elements and g elements without children to make downloaded svg smaller in size
function removeUnusedElements(clone) {
  if (!terrain.selectAll("use").size()) clone.select("#defs-relief")?.remove();

  for (let empty = 1; empty; ) {
    empty = 0;
    clone.selectAll("g").each(function () {
      if (!this.hasChildNodes() || this.style.display === "none" || this.classList.contains("hidden")) {
        empty++;
        this.remove();
      }
      if (this.hasAttribute("display") && this.style.display === "inline") this.removeAttribute("display");
    });
  }
}

function updateMeshCells(clone) {
  const data = renderOcean.checked ? grid.cells.i : grid.cells.i.filter(i => grid.cells.h[i] >= 20);
  const scheme = getColorScheme(terrs.attr("scheme"));
  clone.select("#heights").attr("filter", "url(#blur1)");
  clone
    .select("#heights")
    .selectAll("polygon")
    .data(data)
    .join("polygon")
    .attr("points", d => getGridPolygon(d))
    .attr("id", d => "cell" + d)
    .attr("stroke", d => getColor(grid.cells.h[d], scheme));
}

// for each g element get inline style
function inlineStyle(clone) {
  const emptyG = clone.append("g").node();
  const defaultStyles = window.getComputedStyle(emptyG);

  clone.selectAll("g, #ruler *, #scaleBar > text").each(function () {
    const compStyle = window.getComputedStyle(this);
    let style = "";

    for (let i = 0; i < compStyle.length; i++) {
      const key = compStyle[i];
      const value = compStyle.getPropertyValue(key);

      // Firefox mask hack
      if (key === "mask-image" && value !== defaultStyles.getPropertyValue(key)) {
        style += "mask-image: url('#land');";
        continue;
      }

      if (key === "cursor") continue; // cursor should be default
      if (this.hasAttribute(key)) continue; // don't add style if there is the same attribute
      if (value === defaultStyles.getPropertyValue(key)) continue;
      style += key + ":" + value + ";";
    }

    for (const key in compStyle) {
      const value = compStyle.getPropertyValue(key);

      if (key === "cursor") continue; // cursor should be default
      if (this.hasAttribute(key)) continue; // don't add style if there is the same attribute
      if (value === defaultStyles.getPropertyValue(key)) continue;
      style += key + ":" + value + ";";
    }

    if (style != "") this.setAttribute("style", style);
  });

  emptyG.remove();
}

function saveGeoJSON_Cells() {
  const json = {type: "FeatureCollection", features: []};
  const cells = pack.cells;
  const getPopulation = i => {
    const [r, u] = getCellPopulation(i);
    return rn(r + u);
  };
  const getHeight = i => parseInt(getFriendlyHeight([cells.p[i][0], cells.p[i][1]]));

  cells.i.forEach(i => {
    const coordinates = getCellCoordinates(cells.v[i]);
    const height = getHeight(i);
    const biome = cells.biome[i];
    const type = pack.features[cells.f[i]].type;
    const population = getPopulation(i);
    const state = cells.state[i];
    const province = cells.province[i];
    const culture = cells.culture[i];
    const religion = cells.religion[i];
    const neighbors = cells.c[i];

    const properties = {id: i, height, biome, type, population, state, province, culture, religion, neighbors};
    const feature = {type: "Feature", geometry: {type: "Polygon", coordinates}, properties};
    json.features.push(feature);
  });

  const fileName = getFileName("Cells") + ".geojson";
  downloadFile(JSON.stringify(json), fileName, "application/json");
}

function saveGeoJSON_Routes() {
  const json = {type: "FeatureCollection", features: []};

  routes.selectAll("g > path").each(function () {
    const coordinates = getRoutePoints(this);
    const id = this.id;
    const type = this.parentElement.id;

    const feature = {type: "Feature", geometry: {type: "LineString", coordinates}, properties: {id, type}};
    json.features.push(feature);
  });

  const fileName = getFileName("Routes") + ".geojson";
  downloadFile(JSON.stringify(json), fileName, "application/json");
}

function saveGeoJSON_Rivers() {
  const json = {type: "FeatureCollection", features: []};

  rivers.selectAll("path").each(function () {
    const river = pack.rivers.find(r => r.i === +this.id.slice(5));
    if (!river) return;

    const coordinates = getRiverPoints(this);
    const properties = {...river, id: this.id};
    const feature = {type: "Feature", geometry: {type: "LineString", coordinates}, properties};
    json.features.push(feature);
  });

  const fileName = getFileName("Rivers") + ".geojson";
  downloadFile(JSON.stringify(json), fileName, "application/json");
}

function saveGeoJSON_Markers() {
  const features = pack.markers.map(marker => {
    const {i, type, icon, x, y, size, fill, stroke} = marker;
    const coordinates = getCoordinates(x, y, 4);
    const id = `marker${i}`;
    const note = notes.find(note => note.id === id);
    const properties = {id, type, icon, x, y, ...note, size, fill, stroke};
    return {type: "Feature", geometry: {type: "Point", coordinates}, properties};
  });

  const json = {type: "FeatureCollection", features};

  const fileName = getFileName("Markers") + ".geojson";
  downloadFile(JSON.stringify(json), fileName, "application/json");
}

function getCellCoordinates(vertices) {
  const p = pack.vertices.p;
  const coordinates = vertices.map(n => getCoordinates(p[n][0], p[n][1], 2));
  return [coordinates.concat([coordinates[0]])];
}

function getRoutePoints(node) {
  let points = [];
  const l = node.getTotalLength();
  const increment = l / Math.ceil(l / 2);
  for (let i = 0; i <= l; i += increment) {
    const p = node.getPointAtLength(i);
    points.push(getCoordinates(p.x, p.y, 4));
  }
  return points;
}

function getRiverPoints(node) {
  let points = [];
  const l = node.getTotalLength() / 2; // half-length
  const increment = 0.25; // defines density of points
  for (let i = l, c = i; i >= 0; i -= increment, c += increment) {
    const p1 = node.getPointAtLength(i);
    const p2 = node.getPointAtLength(c);
    const [x, y] = getCoordinates((p1.x + p2.x) / 2, (p1.y + p2.y) / 2, 4);
    points.push([x, y]);
  }
  return points;
}