// UI module to control the style
'use strict';

// store some style inputs as options
styleElements.addEventListener('change', function (ev) {
  if (ev.target.dataset.stored) lock(ev.target.dataset.stored);
});

// select element to be edited
function editStyle(element, group) {
  showOptions();
  styleTab.click();
  styleElementSelect.value = element;
  if (group) styleGroupSelect.options.add(new Option(group, group, true, true));
  selectStyleElement();

  styleElementSelect.classList.add('glow');
  if (group) styleGroupSelect.classList.add('glow');
  setTimeout(() => {
    styleElementSelect.classList.remove('glow');
    if (group) styleGroupSelect.classList.remove('glow');
  }, 1500);
}

// Toggle style sections on element select
styleElementSelect.addEventListener('change', selectStyleElement);
function selectStyleElement() {
  const sel = styleElementSelect.value;
  let el = d3.select('#' + sel);

  styleElements.querySelectorAll('tbody').forEach((e) => (e.style.display = 'none')); // hide all sections
  const off = sel !== 'ocean' && (el.style('display') === 'none' || !el.selectAll('*').size()); // check if layer is off
  if (off) {
    styleIsOff.style.display = 'block';
    setTimeout(() => (styleIsOff.style.display = 'none'), 1500);
  }

  // active group element
  const group = styleGroupSelect.value;
  if (['routes', 'labels', 'coastline', 'lakes', 'anchors', 'burgIcons', 'borders'].includes(sel)) {
    el = d3
      .select('#' + sel)
      .select('g#' + group)
      .size()
      ? d3.select('#' + sel).select('g#' + group)
      : d3.select('#' + sel).select('g');
  }

  if (sel !== 'landmass' && sel !== 'legend') {
    // opacity
    if (sel !== 'ocean') {
      styleOpacity.style.display = 'block';
      styleOpacityInput.value = styleOpacityOutput.value = el.attr('opacity') || 1;
    }

    // filter
    styleFilter.style.display = 'block';
    styleFilterInput.value = el.attr('filter') || '';
  }

  // fill
  if (['rivers', 'lakes', 'landmass', 'prec', 'ice', 'fogging'].includes(sel)) {
    styleFill.style.display = 'block';
    styleFillInput.value = styleFillOutput.value = el.attr('fill');
  }

  // stroke color and width
  if (['armies', 'routes', 'lakes', 'borders', 'cults', 'relig', 'cells', 'coastline', 'prec', 'ice', 'icons', 'coordinates', 'zones', 'gridOverlay'].includes(sel)) {
    styleStroke.style.display = 'block';
    styleStrokeInput.value = styleStrokeOutput.value = el.attr('stroke');
    styleStrokeWidth.style.display = 'block';
    styleStrokeWidthInput.value = styleStrokeWidthOutput.value = el.attr('stroke-width') || '';
  }

  // stroke dash
  if (['routes', 'borders', 'temperature', 'legend', 'population', 'coordinates', 'zones', 'gridOverlay'].includes(sel)) {
    styleStrokeDash.style.display = 'block';
    styleStrokeDasharrayInput.value = el.attr('stroke-dasharray') || '';
    styleStrokeLinecapInput.value = el.attr('stroke-linecap') || 'inherit';
  }

  // clipping
  if (['cells', 'gridOverlay', 'coordinates', 'compass', 'terrain', 'temperature', 'routes', 'texture', 'biomes', 'zones'].includes(sel)) {
    styleClipping.style.display = 'block';
    styleClippingInput.value = el.attr('mask') || '';
  }

  // show specific sections
  if (sel === 'texture') styleTexture.style.display = 'block';
  if ((sel === 'routes', 'labels' || sel == 'anchors' || sel == 'burgIcons', 'coastline', 'lakes', 'borders')) styleGroup.style.display = 'block';

  if (sel === 'terrs') {
    styleHeightmap.style.display = 'block';
    styleHeightmapScheme.value = terrs.attr('scheme');
    styleHeightmapTerracing.value = styleHeightmapTerracingOutput.value = terrs.attr('terracing');
    styleHeightmapSkip.value = styleHeightmapSkipOutput.value = terrs.attr('skip');
    styleHeightmapSimplification.value = styleHeightmapSimplificationOutput.value = terrs.attr('relax');
    styleHeightmapCurve.value = terrs.attr('curve');
  }

  if (sel === 'markers') {
    styleMarkers.style.display = 'block';
    styleRescaleMarkers.checked = +markers.attr('rescale');
  }

  if (sel === 'gridOverlay') {
    styleGrid.style.display = 'block';
    styleGridType.value = el.attr('type');
    styleGridScale.value = el.attr('scale') || 1;
    styleGridShiftX.value = el.attr('dx') || 0;
    styleGridShiftY.value = el.attr('dy') || 0;
    calculateFriendlyGridSize();
  }

  if (sel === 'compass') {
    styleCompass.style.display = 'block';
    const tr = parseTransform(compass.select('use').attr('transform'));
    styleCompassShiftX.value = tr[0];
    styleCompassShiftY.value = tr[1];
    styleCompassSizeInput.value = styleCompassSizeOutput.value = tr[2];
  }

  if (sel === 'terrain') {
    styleRelief.style.display = 'block';
    styleReliefSizeOutput.innerHTML = styleReliefSizeInput.value = terrain.attr('size');
    styleReliefDensityOutput.innerHTML = styleReliefDensityInput.value = terrain.attr('density');
    styleReliefSet.value = terrain.attr('set');
  }

  if (sel === 'population') {
    stylePopulation.style.display = 'block';
    stylePopulationRuralStrokeInput.value = stylePopulationRuralStrokeOutput.value = population.select('#rural').attr('stroke');
    stylePopulationUrbanStrokeInput.value = stylePopulationUrbanStrokeOutput.value = population.select('#urban').attr('stroke');
    styleStrokeWidth.style.display = 'block';
    styleStrokeWidthInput.value = styleStrokeWidthOutput.value = el.attr('stroke-width') || '';
  }

  if (sel === 'regions') {
    styleStates.style.display = 'block';
    styleStatesHaloWidth.value = styleStatesHaloWidthOutput.value = statesHalo.attr('data-width');
    styleStatesHaloOpacity.value = styleStatesHaloOpacityOutput.value = statesHalo.attr('opacity');
  }

  if (sel === 'labels') {
    styleFill.style.display = 'block';
    styleStroke.style.display = 'block';
    styleStrokeWidth.style.display = 'block';
    loadDefaultFonts();
    styleFont.style.display = 'block';
    styleSize.style.display = 'block';
    styleVisibility.style.display = 'block';
    styleFillInput.value = styleFillOutput.value = el.attr('fill') || '#3e3e4b';
    styleStrokeInput.value = styleStrokeOutput.value = el.attr('stroke') || '#3a3a3a';
    styleStrokeWidthInput.value = styleStrokeWidthOutput.value = el.attr('stroke-width') || 0;
    styleSelectFont.value = fonts.indexOf(el.attr('data-font'));
    styleInputFont.style.display = 'none';
    styleInputFont.value = '';
    styleFontSize.value = el.attr('data-size');
  }

  if (sel === 'provs') {
    styleFill.style.display = 'block';
    loadDefaultFonts();
    styleFont.style.display = 'block';
    styleSize.style.display = 'block';
    styleFillInput.value = styleFillOutput.value = el.attr('fill') || '#111111';
    styleSelectFont.value = fonts.indexOf(el.attr('data-font'));
    styleInputFont.style.display = 'none';
    styleInputFont.value = '';
    styleFontSize.value = el.attr('data-size');
  }

  if (sel == 'burgIcons') {
    styleFill.style.display = 'block';
    styleStroke.style.display = 'block';
    styleStrokeWidth.style.display = 'block';
    styleStrokeDash.style.display = 'block';
    styleRadius.style.display = 'block';
    styleFillInput.value = styleFillOutput.value = el.attr('fill') || '#ffffff';
    styleStrokeInput.value = styleStrokeOutput.value = el.attr('stroke') || '#3e3e4b';
    styleStrokeWidthInput.value = styleStrokeWidthOutput.value = el.attr('stroke-width') || 0.24;
    styleStrokeDasharrayInput.value = el.attr('stroke-dasharray') || '';
    styleStrokeLinecapInput.value = el.attr('stroke-linecap') || 'inherit';
    styleRadiusInput.value = el.attr('size') || 1;
  }

  if (sel == 'anchors') {
    styleFill.style.display = 'block';
    styleStroke.style.display = 'block';
    styleStrokeWidth.style.display = 'block';
    styleIconSize.style.display = 'block';
    styleFillInput.value = styleFillOutput.value = el.attr('fill') || '#ffffff';
    styleStrokeInput.value = styleStrokeOutput.value = el.attr('stroke') || '#3e3e4b';
    styleStrokeWidthInput.value = styleStrokeWidthOutput.value = el.attr('stroke-width') || 0.24;
    styleIconSizeInput.value = el.attr('size') || 2;
  }

  if (sel === 'legend') {
    styleStroke.style.display = 'block';
    styleStrokeWidth.style.display = 'block';
    loadDefaultFonts();
    styleFont.style.display = 'block';
    styleSize.style.display = 'block';

    styleLegend.style.display = 'block';
    styleLegendColItemsOutput.value = styleLegendColItems.value = el.attr('data-columns');
    styleLegendBackOutput.value = styleLegendBack.value = el.select('#legendBox').attr('fill');
    styleLegendOpacityOutput.value = styleLegendOpacity.value = el.select('#legendBox').attr('fill-opacity');

    styleStrokeInput.value = styleStrokeOutput.value = el.attr('stroke') || '#111111';
    styleStrokeWidthInput.value = styleStrokeWidthOutput.value = el.attr('stroke-width') || 0.5;
    styleSelectFont.value = fonts.indexOf(el.attr('data-font'));
    styleInputFont.style.display = 'none';
    styleInputFont.value = '';
    styleFontSize.value = el.attr('data-size');
  }

  if (sel === 'ocean') {
    styleOcean.style.display = 'block';
    styleOceanFill.value = styleOceanFillOutput.value = oceanLayers.select('#oceanBase').attr('fill');
    styleOceanPattern.value = document.getElementById('oceanicPattern')?.getAttribute('href');
    styleOceanPatternOpacity.value = styleOceanPatternOpacityOutput.value = document.getElementById('oceanPattern').getAttribute('opacity') || 1;
    outlineLayers.value = oceanLayers.attr('layers');
  }

  if (sel === 'temperature') {
    styleStrokeWidth.style.display = 'block';
    styleTemperature.style.display = 'block';
    styleStrokeWidthInput.value = styleStrokeWidthOutput.value = el.attr('stroke-width') || '';
    styleTemperatureFillOpacityInput.value = styleTemperatureFillOpacityOutput.value = el.attr('fill-opacity') || 0.1;
    styleTemperatureFillInput.value = styleTemperatureFillOutput.value = el.attr('fill') || '#000';
    styleTemperatureFontSizeInput.value = styleTemperatureFontSizeOutput.value = el.attr('font-size') || '8px';
  }

  if (sel === 'coordinates') {
    styleSize.style.display = 'block';
    styleFontSize.value = el.attr('data-size');
  }

  if (sel === 'armies') {
    styleArmies.style.display = 'block';
    styleArmiesFillOpacity.value = styleArmiesFillOpacityOutput.value = el.attr('fill-opacity');
    styleArmiesSize.value = styleArmiesSizeOutput.value = el.attr('box-size');
  }

  if (sel === 'emblems') {
    styleEmblems.style.display = 'block';
    styleStrokeWidth.style.display = 'block';
    styleStrokeWidthInput.value = styleStrokeWidthOutput.value = el.attr('stroke-width') || 1;
  }

  // update group options
  styleGroupSelect.options.length = 0; // remove all options
  if (['routes', 'labels', 'coastline', 'lakes', 'anchors', 'burgIcons', 'borders'].includes(sel)) {
    document
      .getElementById(sel)
      .querySelectorAll('g')
      .forEach((el) => {
        if (el.id === 'burgLabels') return;
        const count = el.childElementCount;
        styleGroupSelect.options.add(new Option(`${el.id} (${count})`, el.id, false, false));
      });
    styleGroupSelect.value = el.attr('id');
  } else {
    styleGroupSelect.options.add(new Option(sel, sel, false, true));
  }

  if (sel === 'coastline' && styleGroupSelect.value === 'sea_island') {
    styleCoastline.style.display = 'block';
    const auto = (styleCoastlineAuto.checked = coastline.select('#sea_island').attr('auto-filter'));
    if (auto) styleFilter.style.display = 'none';
  }
}

// Handle style inputs change
styleGroupSelect.addEventListener('change', selectStyleElement);

function getEl() {
  const el = styleElementSelect.value,
    g = styleGroupSelect.value;
  if (g === el) return svg.select('#' + el);
  else return svg.select('#' + el).select('#' + g);
}

styleFillInput.addEventListener('input', function () {
  styleFillOutput.value = this.value;
  getEl().attr('fill', this.value);
});

styleStrokeInput.addEventListener('input', function () {
  styleStrokeOutput.value = this.value;
  getEl().attr('stroke', this.value);
  if (styleElementSelect.value === 'gridOverlay' && layerIsOn('toggleGrid')) drawGrid();
});

styleStrokeWidthInput.addEventListener('input', function () {
  styleStrokeWidthOutput.value = this.value;
  getEl().attr('stroke-width', +this.value);
  if (styleElementSelect.value === 'gridOverlay' && layerIsOn('toggleGrid')) drawGrid();
});

styleStrokeDasharrayInput.addEventListener('input', function () {
  getEl().attr('stroke-dasharray', this.value);
  if (styleElementSelect.value === 'gridOverlay' && layerIsOn('toggleGrid')) drawGrid();
});

styleStrokeLinecapInput.addEventListener('change', function () {
  getEl().attr('stroke-linecap', this.value);
  if (styleElementSelect.value === 'gridOverlay' && layerIsOn('toggleGrid')) drawGrid();
});

styleOpacityInput.addEventListener('input', function () {
  styleOpacityOutput.value = this.value;
  getEl().attr('opacity', this.value);
});

styleFilterInput.addEventListener('change', function () {
  if (styleGroupSelect.value === 'ocean') {
    oceanLayers.attr('filter', this.value);
    return;
  }
  getEl().attr('filter', this.value);
});

styleTextureInput.addEventListener('change', function () {
  if (this.value === 'none') texture.select('image').attr('xlink:href', '');
  if (this.value === 'default') texture.select('image').attr('xlink:href', getDefaultTexture());
  else getBase64(this.value, (base64) => texture.select('image').attr('xlink:href', base64));
});

styleTextureShiftX.addEventListener('input', function () {
  texture
    .select('image')
    .attr('x', this.value)
    .attr('width', graphWidth - this.valueAsNumber);
});

styleTextureShiftY.addEventListener('input', function () {
  texture
    .select('image')
    .attr('y', this.value)
    .attr('height', graphHeight - this.valueAsNumber);
});

styleClippingInput.addEventListener('change', function () {
  getEl().attr('mask', this.value);
});

styleGridType.addEventListener('change', function () {
  getEl().attr('type', this.value);
  if (layerIsOn('toggleGrid')) drawGrid();
  calculateFriendlyGridSize();
});

styleGridScale.addEventListener('input', function () {
  getEl().attr('scale', this.value);
  if (layerIsOn('toggleGrid')) drawGrid();
  calculateFriendlyGridSize();
});

function calculateFriendlyGridSize() {
  const size = styleGridScale.value * 25;
  const friendly = `${rn(size * distanceScaleInput.value, 2)} ${distanceUnitInput.value}`;
  styleGridSizeFriendly.value = friendly;
}

styleGridShiftX.addEventListener('input', function () {
  getEl().attr('dx', this.value);
  if (layerIsOn('toggleGrid')) drawGrid();
});

styleGridShiftY.addEventListener('input', function () {
  getEl().attr('dy', this.value);
  if (layerIsOn('toggleGrid')) drawGrid();
});

styleShiftX.addEventListener('input', shiftElement);
styleShiftY.addEventListener('input', shiftElement);

function shiftElement() {
  const x = styleShiftX.value || 0;
  const y = styleShiftY.value || 0;
  getEl().attr('transform', `translate(${x},${y})`);
}

styleRescaleMarkers.addEventListener('change', function () {
  markers.attr('rescale', +this.checked);
  invokeActiveZooming();
});

styleCoastlineAuto.addEventListener('change', function () {
  coastline.select('#sea_island').attr('auto-filter', +this.checked);
  styleFilter.style.display = this.checked ? 'none' : 'block';
  invokeActiveZooming();
});

styleOceanFill.addEventListener('input', function () {
  oceanLayers.select('rect').attr('fill', this.value);
  styleOceanFillOutput.value = this.value;
});

styleOceanPattern.addEventListener('change', function () {
  document.getElementById('oceanicPattern')?.setAttribute('href', this.value);
});

styleOceanPatternOpacity.addEventListener('input', function () {
  document.getElementById('oceanPattern').setAttribute('opacity', this.value);
  styleOceanPatternOpacityOutput.value = this.value;
});

outlineLayers.addEventListener('change', function () {
  oceanLayers.selectAll('path').remove();
  oceanLayers.attr('layers', this.value);
  OceanLayers();
});

styleHeightmapScheme.addEventListener('change', function () {
  terrs.attr('scheme', this.value);
  drawHeightmap();
});

styleHeightmapTerracing.addEventListener('input', function () {
  styleHeightmapTerracingOutput.value = this.value;
  terrs.attr('terracing', this.value);
  drawHeightmap();
});

styleHeightmapSkip.addEventListener('input', function () {
  styleHeightmapSkipOutput.value = this.value;
  terrs.attr('skip', this.value);
  drawHeightmap();
});

styleHeightmapSimplification.addEventListener('input', function () {
  styleHeightmapSimplificationOutput.value = this.value;
  terrs.attr('relax', this.value);
  drawHeightmap();
});

styleHeightmapCurve.addEventListener('change', function () {
  terrs.attr('curve', this.value);
  drawHeightmap();
});

styleReliefSet.addEventListener('change', function () {
  terrain.attr('set', this.value);
  ReliefIcons();
  if (!layerIsOn('toggleRelief')) toggleRelief();
});

styleReliefSizeInput.addEventListener('change', function () {
  styleReliefSizeOutput.value = this.value;
  const size = +this.value;
  terrain.attr('size', size);

  terrain.selectAll('use').each(function (d) {
    const newSize = this.getAttribute('data-size') * size;
    const shift = (newSize - +this.getAttribute('width')) / 2;
    this.setAttribute('width', newSize);
    this.setAttribute('height', newSize);
    const x = +this.getAttribute('x');
    const y = +this.getAttribute('y');
    this.setAttribute('x', x - shift);
    this.setAttribute('y', y - shift);
  });
});

styleReliefDensityInput.addEventListener('input', function () {
  terrain.attr('density', this.value);
  styleReliefDensityOutput.value = this.value;
  ReliefIcons();
  if (!layerIsOn('toggleRelief')) toggleRelief();
});

styleTemperatureFillOpacityInput.addEventListener('input', function () {
  temperature.attr('fill-opacity', this.value);
  styleTemperatureFillOpacityOutput.value = this.value;
});

styleTemperatureFontSizeInput.addEventListener('input', function () {
  temperature.attr('font-size', this.value + 'px');
  styleTemperatureFontSizeOutput.value = this.value + 'px';
});

styleTemperatureFillInput.addEventListener('input', function () {
  temperature.attr('fill', this.value);
  styleTemperatureFillOutput.value = this.value;
});

stylePopulationRuralStrokeInput.addEventListener('input', function () {
  population.select('#rural').attr('stroke', this.value);
  stylePopulationRuralStrokeOutput.value = this.value;
});

stylePopulationUrbanStrokeInput.addEventListener('input', function () {
  population.select('#urban').attr('stroke', this.value);
  stylePopulationUrbanStrokeOutput.value = this.value;
});

styleCompassSizeInput.addEventListener('input', function () {
  styleCompassSizeOutput.value = this.value;
  shiftCompass();
});

styleCompassShiftX.addEventListener('input', shiftCompass);
styleCompassShiftY.addEventListener('input', shiftCompass);

function shiftCompass() {
  const tr = `translate(${styleCompassShiftX.value} ${styleCompassShiftY.value}) scale(${styleCompassSizeInput.value})`;
  compass.select('use').attr('transform', tr);
}

styleLegendColItems.addEventListener('input', function () {
  styleLegendColItemsOutput.value = this.value;
  legend.select('#legendBox').attr('data-columns', this.value);
  redrawLegend();
});

styleLegendBack.addEventListener('input', function () {
  styleLegendBackOutput.value = this.value;
  legend.select('#legendBox').attr('fill', this.value);
});

styleLegendOpacity.addEventListener('input', function () {
  styleLegendOpacityOutput.value = this.value;
  legend.select('#legendBox').attr('fill-opacity', this.value);
});

styleSelectFont.addEventListener('change', changeFont);
function changeFont() {
  const value = styleSelectFont.value;
  const font = fonts[value].split(':')[0].replace(/\+/g, ' ');
  getEl().attr('font-family', font).attr('data-font', fonts[value]);
  if (styleElementSelect.value === 'legend') redrawLegend();
}

styleFontAdd.addEventListener('click', function () {
  if (styleInputFont.style.display === 'none') {
    styleInputFont.style.display = 'inline-block';
    styleInputFont.focus();
    styleSelectFont.style.display = 'none';
  } else {
    styleInputFont.style.display = 'none';
    styleSelectFont.style.display = 'inline-block';
  }
});

styleInputFont.addEventListener('change', function () {
  if (!this.value) {
    tip('Please provide a valid Google font name or link to a @font-face declaration');
    return;
  }
  fetchFonts(this.value).then((fetched) => {
    if (!fetched) return;
    styleFontAdd.click();
    styleInputFont.value = '';
    if (fetched !== 1) return;
    styleSelectFont.value = fonts.length - 1;
    changeFont(); // auto-change font if 1 font is fetched
  });
});

styleFontSize.addEventListener('change', function () {
  changeFontSize(+this.value);
});

styleFontPlus.addEventListener('click', function () {
  const size = Math.max(rn(getEl().attr('data-size') * 1.1, 2), 1);
  changeFontSize(size);
});

styleFontMinus.addEventListener('click', function () {
  const size = Math.max(rn(getEl().attr('data-size') * 0.9, 2), 1);
  changeFontSize(size);
});

function changeFontSize(size) {
  const legend = styleElementSelect.value === 'legend';
  const coords = styleElementSelect.value === 'coordinates';

  const desSize = legend ? size : coords ? rn(size / scale ** 0.8, 2) : rn(size + size / scale);
  getEl().attr('data-size', size).attr('font-size', desSize);
  styleFontSize.value = size;
  if (legend) redrawLegend();
}

styleRadiusInput.addEventListener('change', function () {
  changeRadius(+this.value);
});

styleRadiusPlus.addEventListener('click', function () {
  const size = Math.max(rn(getEl().attr('size') * 1.1, 2), 0.2);
  changeRadius(size);
});

styleRadiusMinus.addEventListener('click', function () {
  const size = Math.max(rn(getEl().attr('size') * 0.9, 2), 0.2);
  changeRadius(size);
});

function changeRadius(size, group) {
  const el = group ? burgIcons.select('#' + group) : getEl();
  const g = el.attr('id');
  el.attr('size', size);
  el.selectAll('circle').each(function () {
    this.setAttribute('r', size);
  });
  styleRadiusInput.value = size;
  burgLabels
    .select('g#' + g)
    .selectAll('text')
    .each(function () {
      this.setAttribute('dy', `${size * -1.5}px`);
    });
  changeIconSize(size * 2, g); // change also anchor icons
}

styleIconSizeInput.addEventListener('change', function () {
  changeIconSize(+this.value);
});

styleIconSizePlus.addEventListener('click', function () {
  const size = Math.max(rn(getEl().attr('size') * 1.1, 2), 0.2);
  changeIconSize(size);
});

styleIconSizeMinus.addEventListener('click', function () {
  const size = Math.max(rn(getEl().attr('size') * 0.9, 2), 0.2);
  changeIconSize(size);
});

function changeIconSize(size, group) {
  const el = group ? anchors.select('#' + group) : getEl();
  const oldSize = +el.attr('size');
  const shift = (size - oldSize) / 2;
  el.attr('size', size);
  el.selectAll('use').each(function () {
    const x = +this.getAttribute('x');
    const y = +this.getAttribute('y');
    this.setAttribute('x', x - shift);
    this.setAttribute('y', y - shift);
    this.setAttribute('width', size);
    this.setAttribute('height', size);
  });
  styleIconSizeInput.value = size;
}

styleStatesHaloWidth.addEventListener('input', function () {
  styleStatesHaloWidthOutput.value = this.value;
  statesHalo.attr('data-width', this.value).attr('stroke-width', this.value);
});

styleStatesHaloOpacity.addEventListener('input', function () {
  styleStatesHaloOpacityOutput.value = this.value;
  statesHalo.attr('opacity', this.value);
});

styleArmiesFillOpacity.addEventListener('input', function () {
  armies.attr('fill-opacity', this.value);
  styleArmiesFillOpacityOutput.value = this.value;
});

styleArmiesSize.addEventListener('input', function () {
  armies.attr('box-size', this.value).attr('font-size', this.value * 2);
  styleArmiesSizeOutput.value = this.value;
  armies.selectAll('g').remove(); // clear armies layer
  pack.states.forEach((s) => {
    if (!s.i || s.removed || !s.military.length) return;
    Military.drawRegiments(s.military, s.i);
  });
});

styleEmblemsStateSizeInput.addEventListener('input', drawEmblems);
styleEmblemsProvinceSizeInput.addEventListener('input', drawEmblems);
styleEmblemsBurgSizeInput.addEventListener('input', drawEmblems);

// request a URL to image to be used as a texture
function textureProvideURL() {
  alertMessage.innerHTML = `Provide an image URL to be used as a texture:
    <input id="textureURL" type="url" style="width: 100%" placeholder="http://www.example.com/image.jpg" oninput="fetchTextureURL(this.value)">
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null},"#textureImage":{},"#zones":{"opacity":0.6,"stroke":"#333333","stroke-width":0,"stroke-dasharray":null,"stroke-linecap":"butt","filter":null,"mask":null},"#ocean":{"opacity":0},"#oceanLayers":{"filter":null,"layers":"none"},"#oceanBase":{"fill":"#000000"},"#oceanPattern":{"opacity":0.2},"#oceanicPattern":{"href":""},"#terrs":{"opacity":1,"scheme":"monochrome","terracing":0,"skip":5,"relax":0,"curve":0,"filter":"url(#blur3)","mask":"url(#land)"},"#legend":{"data-size":13,"font-size":13,"data-font":"Almendra+SC","font-family":"Almendra SC","stroke":"#812929","stroke-width":2.5,"stroke-dasharray":"0 4 10 4","stroke-linecap":"round","data-x":99,"data-y":93,"data-columns":8},"#legendBox":{},"#burgLabels > #cities":{"opacity":1,"fill":"#3e3e4b","data-size":7,"font-size":7,"data-font":"Almendra+SC","font-family":"Almendra SC"},"#burgIcons > #cities":{"opacity":1,"fill":"#ffffff","fill-opacity":0.7,"size":1,"stroke":"#3e3e4b","stroke-width":0.24,"stroke-dasharray":"","stroke-linecap":"butt"},"#anchors > #cities":{"opacity":1,"fill":"#ffffff","size":2,"stroke":"#3e3e4b","stroke-width":1.2},"#burgLabels > #towns":{"opacity":1,"fill":"#3e3e4b","data-size":4,"font-size":4,"data-font":"Almendra+SC","font-family":"Almendra SC"},"#burgIcons > #towns":{"opacity":1,"fill":"#ffffff","fill-opacity":0.7,"size":0.5,"stroke":"#3e3e4b","stroke-width":0.12,"stroke-dasharray":"","stroke-linecap":"butt"},"#anchors > #towns":{"opacity":1,"fill":"#ffffff","size":1,"stroke":"#3e3e4b","stroke-width":1.2},"#labels > #states":{"opacity":1,"fill":"#3e3e4b","stroke":"#3a3a3a","stroke-width":0,"data-size":22,"font-size":22,"data-font":"Almendra+SC","font-family":"Almendra SC","filter":null},"#labels > #addedLabels":{"opacity":1,"fill":"#3e3e4b","stroke":"#3a3a3a","stroke-width":0,"data-size":18,"font-size":18,"data-font":"Almendra+SC","font-family":"Almendra SC","filter":null},"#fogging":{"opacity":0.98,"fill":"#30426f","filter":null}}`
};

// apply default or custom style settings on load
function applyStyleOnLoad() {
  const preset = localStorage.getItem('presetStyle');
  const style = preset && (defaultStyles[preset] || localStorage.getItem(preset));

  if (preset && style && JSON.isValid(style)) {
    applyStyle(JSON.parse(style));
    updateMapFilter();
    loadDefaultFonts();
    stylePreset.value = preset;
    stylePreset.dataset.old = preset;
  } else {
    if (preset && preset !== 'styleDefault' && ERROR) console.error(`Style preset ${preset} is not available in localStorage, applying default style`);
    stylePreset.value = 'styleDefault';
    stylePreset.dataset.old = preset;
    applyDefaultStyle();
  }
}

// set default style
function applyDefaultStyle() {
  armies.attr('opacity', 1).attr('fill-opacity', 1).attr('font-size', 6).attr('box-size', 3).attr('stroke', '#000').attr('stroke-width', 0.3);

  biomes.attr('opacity', null).attr('filter', null).attr('mask', null);
  ice.attr('opacity', 0.9).attr('fill', '#e8f0f6').attr('stroke', '#e8f0f6').attr('stroke-width', 1).attr('filter', 'url(#dropShadow05)');
  stateBorders.attr('opacity', 0.8).attr('stroke', '#56566d').attr('stroke-width', 1).attr('stroke-dasharray', '2').attr('stroke-linecap', 'butt').attr('filter', null);
  provinceBorders.attr('opacity', 0.8).attr('stroke', '#56566d').attr('stroke-width', 0.5).attr('stroke-dasharray', '0 2').attr('stroke-linecap', 'round').attr('filter', null);
  cells.attr('opacity', null).attr('stroke', '#808080').attr('stroke-width', 0.1).attr('filter', null).attr('mask', null);

  gridOverlay
    .attr('opacity', 0.8)
    .attr('type', 'pointyHex')
    .attr('scale', 1)
    .attr('dx', 0)
    .attr('dy', 0)
    .attr('stroke', '#777777')
    .attr('stroke-width', 0.5)
    .attr('stroke-dasharray', null)
    .attr('filter', null)
    .attr('mask', null);
  coordinates.attr('opacity', 1).attr('data-size', 12).attr('font-size', 12).attr('stroke', '#d4d4d4').attr('stroke-width', 1).attr('stroke-dasharray', 5).attr('filter', null).attr('mask', null);
  compass.attr('opacity', 0.8).attr('transform', null).attr('filter', null).attr('mask', 'url(#water)').attr('shape-rendering', 'optimizespeed');
  if (!d3.select('#initial').size()) d3.select('#rose').attr('transform', 'translate(80 80) scale(.25)');

  relig.attr('opacity', 0.7).attr('stroke', '#777777').attr('stroke-width', 0).attr('filter', null);
  cults.attr('opacity', 0.6).attr('stroke', '#777777').attr('stroke-width', 0.5).attr('filter', null);
  landmass.attr('opacity', 1).attr('fill', '#eef6fb').attr('filter', null);
  markers.attr('opacity', null).attr('rescale', 1).attr('filter', 'url(#dropShadow01)');

  prec.attr('opacity', null).attr('stroke', '#000000').attr('stroke-width', 0.1).attr('fill', '#003dff').attr('filter', null);
  population.attr('opacity', null).attr('stroke-width', 1.6).attr('stroke-dasharray', null).attr('stroke-linecap', 'butt').attr('filter', null);
  population.select('#rural').attr('stroke', '#0000ff');
  population.select('#urban').attr('stroke', '#ff0000');

  lakes.select('#freshwater').attr('opacity', 0.5).attr('fill', '#a6c1fd').attr('stroke', '#5f799d').attr('stroke-width', 0.7).attr('filter', null);
  lakes.select('#salt').attr('opacity', 0.5).attr('fill', '#409b8a').attr('stroke', '#388985').attr('stroke-width', 0.7).attr('filter', null);
  lakes.select('#sinkhole').attr('opacity', 1).attr('fill', '#5bc9fd').attr('stroke', '#53a3b0').attr('stroke-width', 0.7).attr('filter', null);
  lakes.select('#frozen').attr('opacity', 0.95).attr('fill', '#cdd4e7').attr('stroke', '#cfe0eb').attr('stroke-width', 0).attr('filter', null);
  lakes.select('#lava').attr('opacity', 0.7).attr('fill', '#90270d').attr('stroke', '#f93e0c').attr('stroke-width', 2).attr('filter', 'url(#crumpled)');
  lakes.select('#dry').attr('opacity', 1).attr('fill', '#c9bfa7').attr('stroke', '#8e816f').attr('stroke-width', 0.7).attr('filter', null);

  coastline.select('#sea_island').attr('opacity', 0.5).attr('stroke', '#1f3846').attr('stroke-width', 0.7).attr('auto-filter', 1).attr('filter', 'url(#dropShadow)');
  coastline.select('#lake_island').attr('opacity', 1).attr('stroke', '#7c8eaf').attr('stroke-width', 0.35).attr('filter', null);

  terrain.attr('opacity', null).attr('set', 'simple').attr('size', 1).attr('density', 0.4).attr('filter', null).attr('mask', null);
  rivers.attr('opacity', null).attr('fill', '#5d97bb').attr('filter', null);
  ruler.attr('opacity', null).attr('filter', null);

  roads.attr('opacity', 0.9).attr('stroke', '#d06324').attr('stroke-width', 0.7).attr('stroke-dasharray', '2').attr('stroke-linecap', 'butt').attr('filter', null).attr('mask', null);
  trails.attr('opacity', 0.9).attr('stroke', '#d06324').attr('stroke-width', 0.25).attr('stroke-dasharray', '.8 1.6').attr('stroke-linecap', 'butt').attr('filter', null).attr('mask', null);
  searoutes.attr('opacity', 0.8).attr('stroke', '#ffffff').attr('stroke-width', 0.45).attr('stroke-dasharray', '1 2').attr('stroke-linecap', 'round').attr('filter', null).attr('mask', null);

  regions.attr('opacity', 0.4).attr('filter', null);
  statesHalo.attr('data-width', 10).attr('stroke-width', 10).attr('opacity', 1);
  provs.attr('opacity', 0.7).attr('fill', '#000000').attr('font-family', 'Georgia').attr('data-font', 'Georgia').attr('data-size', 10).attr('font-size', 10).attr('filter', null);

  temperature
    .attr('opacity', null)
    .attr('fill', '#000000')
    .attr('stroke-width', 1.8)
    .attr('fill-opacity', 0.3)
    .attr('font-size', '8px')
    .attr('stroke-dasharray', null)
    .attr('filter', null)
    .attr('mask', null);
  texture.attr('opacity', null).attr('filter', null).attr('mask', 'url(#land)');
  texture.select('#textureImage').attr('x', 0).attr('y', 0);
  zones.attr('opacity', 0.6).attr('stroke', '#333333').attr('stroke-width', 0).attr('stroke-dasharray', null).attr('stroke-linecap', 'butt').attr('filter', null).attr('mask', null);

  // ocean and svg default style
  svg.attr('background-color', '#000000').attr('data-filter', null).attr('filter', null);
  oceanLayers.select('rect').attr('fill', '#466eab'); // old color #53679f
  oceanLayers.attr('filter', null).attr('layers', '-6,-3,-1');
  oceanPattern.attr('opacity', 0.2);
  svg.select('#oceanicPattern').attr('href', './images/pattern1.png');

  // heightmap style
  terrs.attr('opacity', null).attr('filter', null).attr('mask', 'url(#land)').attr('stroke', 'none').attr('scheme', 'bright').attr('terracing', 0).attr('skip', 5).attr('relax', 0).attr('curve', 0);

  // legend
  legend
    .attr('font-family', 'Almendra SC')
    .attr('data-font', 'Almendra+SC')
    .attr('font-size', 13)
    .attr('data-size', 13)
    .attr('data-x', 99)
    .attr('data-y', 93)
    .attr('data-columns', 8)
    .attr('stroke-width', 2.5)
    .attr('stroke', '#812929')
    .attr('stroke-dasharray', '0 4 10 4')
    .attr('stroke-linecap', 'round');
  legend.select('#legendBox').attr('fill', '#ffffff').attr('fill-opacity', 0.8);

  const citiesSize = Math.max(rn(8 - regionsInput.value / 20), 3);
  burgLabels
    .select('#cities')
    .attr('fill', '#3e3e4b')
    .attr('opacity', 1)
    .attr('font-family', 'Almendra SC')
    .attr('data-font', 'Almendra+SC')
    .attr('font-size', citiesSize)
    .attr('data-size', citiesSize);
  burgIcons
    .select('#cities')
    .attr('opacity', 1)
    .attr('size', 1)
    .attr('stroke-width', 0.24)
    .attr('fill', '#ffffff')
    .attr('stroke', '#3e3e4b')
    .attr('fill-opacity', 0.7)
    .attr('stroke-dasharray', '')
    .attr('stroke-linecap', 'butt');
  anchors.select('#cities').attr('opacity', 1).attr('fill', '#ffffff').attr('stroke', '#3e3e4b').attr('stroke-width', 1.2).attr('size', 2);

  burgLabels.select('#towns').attr('fill', '#3e3e4b').attr('opacity', 1).attr('font-family', 'Almendra SC').attr('data-font', 'Almendra+SC').attr('font-size', 3).attr('data-size', 4);
  burgIcons
    .select('#towns')
    .attr('opacity', 1)
    .attr('size', 0.5)
    .attr('stroke-width', 0.12)
    .attr('fill', '#ffffff')
    .attr('stroke', '#3e3e4b')
    .attr('fill-opacity', 0.7)
    .attr('stroke-dasharray', '')
    .attr('stroke-linecap', 'butt');
  anchors.select('#towns').attr('opacity', 1).attr('fill', '#ffffff').attr('stroke', '#3e3e4b').attr('stroke-width', 1.2).attr('size', 1);

  const stateLabelSize = Math.max(rn(24 - regionsInput.value / 6), 6);
  labels
    .select('#states')
    .attr('fill', '#3e3e4b')
    .attr('opacity', 1)
    .attr('stroke', '#3a3a3a')
    .attr('stroke-width', 0)
    .attr('font-family', 'Almendra SC')
    .attr('data-font', 'Almendra+SC')
    .attr('font-size', stateLabelSize)
    .attr('data-size', stateLabelSize)
    .attr('filter', null);
  labels
    .select('#addedLabels')
    .attr('fill', '#3e3e4b')
    .attr('opacity', 1)
    .attr('stroke', '#3a3a3a')
    .attr('stroke-width', 0)
    .attr('font-family', 'Almendra SC')
    .attr('data-font', 'Almendra+SC')
    .attr('font-size', 18)
    .attr('data-size', 18)
    .attr('filter', null);

  fogging.attr('opacity', 0.98).attr('fill', '#30426f');
  emblems.attr('opacity', 0.9).attr('stroke-width', 1).attr('filter', null);

  goods.attr('opacity', 1).attr('fill', '#000').attr('stroke', '#000').attr('stroke-width', 0.32).attr('filter', 'url(#dropShadow01)');
}

// apply style settings in JSON
function applyStyle(style) {
  for (const selector in style) {
    const el = document.querySelector(selector);
    if (!el) continue;
    for (const attribute in style[selector]) {
      const value = style[selector][attribute];
      if (value === 'null' || value === null) el.removeAttribute(attribute);
      else el.setAttribute(attribute, value);
    }
  }
}

// change current style preset to another saved one
function changeStylePreset(preset) {
  if (customization) return tip('Please exit the customization mode first', false, 'error');

  const message = 'Are you sure you want to change the style preset? <br>All unsaved style changes will be lost';
  const onConfirm = () => {
    const customPreset = localStorage.getItem(preset);
    if (customPreset) {
      if (JSON.isValid(customPreset)) applyStyle(JSON.parse(customPreset));
      else {
        tip('Cannot parse stored style JSON. Default style applied', false, 'error', 5000);
        applyDefaultStyle();
      }
    } else if (defaultStyles[preset]) applyStyle(JSON.parse(defaultStyles[preset]));
    else applyDefaultStyle();

    removeStyleButton.style.display = stylePreset.selectedOptions[0].dataset.system ? 'none' : 'inline-block';
    updateElements(); // change elements
    selectStyleElement(); // re-select element to trigger values update
    updateMapFilter();
    localStorage.setItem('presetStyle', preset); // save preset to use it onload
    stylePreset.dataset.old = stylePreset.value; // save current value
  };
  confirmationDialog({title: 'Change style preset', message, confirm: 'Change', onConfirm});
}

function updateElements() {
  // burgIcons to desired size
  burgIcons.selectAll('g').each(function (d) {
    const size = +this.getAttribute('size');
    d3.select(this)
      .selectAll('circle')
      .each(function () {
        this.setAttribute('r', size);
      });
    burgLabels
      .select('g#' + this.id)
      .selectAll('text')
      .each(function () {
        this.setAttribute('dy', `${size * -1.5}px`);
      });
  });

  // anchor icons to desired size
  anchors.selectAll('g').each(function (d) {
    const size = +this.getAttribute('size');
    d3.select(this)
      .selectAll('use')
      .each(function () {
        const id = +this.dataset.id;
        const x = pack.burgs[id].x,
          y = pack.burgs[id].y;
        this.setAttribute('x', rn(x - size * 0.47, 2));
        this.setAttribute('y', rn(y - size * 0.47, 2));
        this.setAttribute('width', size);
        this.setAttribute('height', size);
      });
  });

  // redraw elements
  if (layerIsOn('toggleHeight')) drawHeightmap();
  if (legend.selectAll('*').size() && window.redrawLegend) redrawLegend();
  oceanLayers.selectAll('path').remove();
  OceanLayers();
  invokeActiveZooming();
}

function addStylePreset() {
  $('#styleSaver').dialog({
    title: 'Style Saver',
    width: '26em',
    position: {my: 'center', at: 'center', of: 'svg'}
  });

  styleSaverJSON.value = JSON.stringify(getStyle(), null, 2);
  checkName();

  if (modules.saveStyle) return;
  modules.saveStyle = true;

  // add listeners
  document.getElementById('styleSaverName').addEventListener('input', checkName);
  document.getElementById('styleSaverSave').addEventListener('click', saveStyle);
  document.getElementById('styleSaverDownload').addEventListener('click', styleDownload);
  document.getElementById('styleSaverLoad').addEventListener('click', () => styleToLoad.click());
  document.getElementById('styleToLoad').addEventListener('change', function () {
    uploadFile(this, styleUpload);
  });

  function getStyle() {
    const style = {},
      attributes = {
        '#map': ['background-color', 'filter', 'data-filter'],
        '#armies': ['font-size', 'box-size', 'stroke', 'stroke-width', 'fill-opacity', 'filter'],
        '#biomes': ['opacity', 'filter', 'mask'],
        '#stateBorders': ['opacity', 'stroke', 'stroke-width', 'stroke-dasharray', 'stroke-linecap', 'filter'],
        '#provinceBorders': ['opacity', 'stroke', 'stroke-width', 'stroke-dasharray', 'stroke-linecap', 'filter'],
        '#cells': ['opacity', 'stroke', 'stroke-width', 'filter', 'mask'],
        '#gridOverlay': ['opacity', 'scale', 'dx', 'dy', 'type', 'stroke', 'stroke-width', 'stroke-dasharray', 'stroke-linecap', 'transform', 'filter', 'mask'],
        '#coordinates': ['opacity', 'data-size', 'font-size', 'stroke', 'stroke-width', 'stroke-dasharray', 'stroke-linecap', 'filter', 'mask'],
        '#compass': ['opacity', 'transform', 'filter', 'mask', 'shape-rendering'],
        '#rose': ['transform'],
        '#relig': ['opacity', 'stroke', 'stroke-width', 'filter'],
        '#cults': ['opacity', 'stroke', 'stroke-width', 'stroke-dasharray', 'stroke-linecap', 'filter'],
        '#landmass': ['opacity', 'fill', 'filter'],
        '#markers': ['opacity', 'rescale', 'filter'],
        '#prec': ['opacity', 'stroke', 'stroke-width', 'fill', 'filter'],
        '#population': ['opacity', 'stroke-width', 'stroke-dasharray', 'stroke-linecap', 'filter'],
        '#rural': ['stroke'],
        '#urban': ['stroke'],
        '#freshwater': ['opacity', 'fill', 'stroke', 'stroke-width', 'filter'],
        '#salt': ['opacity', 'fill', 'stroke', 'stroke-width', 'filter'],
        '#sinkhole': ['opacity', 'fill', 'stroke', 'stroke-width', 'filter'],
        '#frozen': ['opacity', 'fill', 'stroke', 'stroke-width', 'filter'],
        '#lava': ['opacity', 'fill', 'stroke', 'stroke-width', 'filter'],
        '#dry': ['opacity', 'fill', 'stroke', 'stroke-width', 'filter'],
        '#sea_island': ['opacity', 'stroke', 'stroke-width', 'filter', 'auto-filter'],
        '#lake_island': ['opacity', 'stroke', 'stroke-width', 'filter'],
        '#terrain': ['opacity', 'set', 'size', 'density', 'filter', 'mask'],
        '#rivers': ['opacity', 'filter', 'fill'],
        '#ruler': ['opacity', 'filter'],
        '#roads': ['opacity', 'stroke', 'stroke-width', 'stroke-dasharray', 'stroke-linecap', 'filter', 'mask'],
        '#trails': ['opacity', 'stroke', 'stroke-width', 'stroke-dasharray', 'stroke-linecap', 'filter', 'mask'],
        '#searoutes': ['opacity', 'stroke', 'stroke-width', 'stroke-dasharray', 'stroke-linecap', 'filter', 'mask'],
        '#regions': ['opacity', 'filter'],
        '#statesHalo': ['opacity', 'data-width', 'stroke-width'],
        '#provs': ['opacity', 'fill', 'font-size', 'data-font', 'font-family', 'filter'],
        '#temperature': ['opacity', 'font-size', 'fill', 'fill-opacity', 'stroke', 'stroke-width', 'stroke-dasharray', 'stroke-linecap', 'filter'],
        '#ice': ['opacity', 'fill', 'stroke', 'stroke-width', 'filter'],
        '#emblems': ['opacity', 'stroke-width', 'filter'],
        '#texture': ['opacity', 'filter', 'mask'],
        '#textureImage': ['x', 'y'],
        '#zones': ['opacity', 'stroke', 'stroke-width', 'stroke-dasharray', 'stroke-linecap', 'filter', 'mask'],
        '#oceanLayers': ['filter', 'layers'],
        '#oceanBase': ['fill'],
        '#oceanPattern': ['opacity'],
        '#oceanicPattern': ['href'],
        '#terrs': ['opacity', 'scheme', 'terracing', 'skip', 'relax', 'curve', 'filter', 'mask'],
        '#legend': ['data-size', 'font-size', 'data-font', 'font-family', 'stroke', 'stroke-width', 'stroke-dasharray', 'stroke-linecap', 'data-x', 'data-y', 'data-columns'],
        '#legendBox': ['fill', 'fill-opacity'],
        '#burgLabels > #cities': ['opacity', 'fill', 'data-size', 'font-size', 'data-font', 'font-family'],
        '#burgIcons > #cities': ['opacity', 'fill', 'fill-opacity', 'size', 'stroke', 'stroke-width', 'stroke-dasharray', 'stroke-linecap'],
        '#anchors > #cities': ['opacity', 'fill', 'size', 'stroke', 'stroke-width'],
        '#burgLabels > #towns': ['opacity', 'fill', 'data-size', 'font-size', 'data-font', 'font-family'],
        '#burgIcons > #towns': ['opacity', 'fill', 'fill-opacity', 'size', 'stroke', 'stroke-width', 'stroke-dasharray', 'stroke-linecap'],
        '#anchors > #towns': ['opacity', 'fill', 'size', 'stroke', 'stroke-width'],
        '#labels > #states': ['opacity', 'fill', 'stroke', 'stroke-width', 'data-size', 'font-size', 'data-font', 'font-family', 'filter'],
        '#labels > #addedLabels': ['opacity', 'fill', 'stroke', 'stroke-width', 'data-size', 'font-size', 'data-font', 'font-family', 'filter'],
        '#fogging': ['opacity', 'fill', 'filter']
      };

    for (const selector in attributes) {
      const s = (style[selector] = {});
      attributes[selector].forEach((attr) => {
        const el = document.querySelector(selector);
        if (!el) return;
        let value = el.getAttribute(attr);
        if (attr === 'font-size' && el.hasAttribute('data-size')) value = el.getAttribute('data-size');
        s[attr] = parseValue(value);
      });
    }

    function parseValue(value) {
      if (value === 'null' || value === null) return null;
      if (value === '') return '';
      if (!isNaN(+value)) return +value;
      return value;
    }

    return style;
  }

  function checkName() {
    let tip = '';
    const v = 'style' + styleSaverName.value;
    const listed = Array.from(stylePreset.options).some((o) => o.value == v);
    const stored = localStorage.getItem(v);
    if (!stored && listed) tip = 'default';
    else if (stored) tip = 'existing';
    else if (styleSaverName.value) tip = 'new';
    styleSaverTip.innerHTML = tip;
  }

  function saveStyle() {
    if (!styleSaverJSON.value) {
      tip('Please provide a style JSON', false, 'error');
      return;
    }
    if (!JSON.isValid(styleSaverJSON.value)) {
      tip('JSON string is not valid, please check the format', false, 'error');
      return;
    }
    if (!styleSaverName.value) {
      tip('Please provide a preset name', false, 'error');
      return;
    }
    if (styleSaverTip.innerHTML === 'default') {
      tip('You cannot overwrite default preset, please change the name', false, 'error');
      return;
    }
    const preset = 'style' + styleSaverName.value;
    applyOption(stylePreset, preset, styleSaverName.value); // add option
    localStorage.setItem('presetStyle', preset); // mark preset as default
    localStorage.setItem(preset, styleSaverJSON.value); // save preset
    $('#styleSaver').dialog('close');
    removeStyleButton.style.display = 'inline-block';
    tip('Style preset is saved', false, 'warn', 4000);
  }

  function styleDownload() {
    if (!styleSaverJSON.value) {
      tip('Please provide a style JSON', false, 'error');
      return;
    }
    if (!JSON.isValid(styleSaverJSON.value)) {
      tip('JSON string is not valid, please check the format', false, 'error');
      return;
    }
    if (!styleSaverName.value) {
      tip('Please provide a preset name', false, 'error');
      return;
    }
    const data = styleSaverJSON.value;
    if (!data) {
      tip('Please provide a style JSON', false, 'error');
      return;
    }
    downloadFile(data, 'style' + styleSaverName.value + '.json', 'application/json');
  }

  function styleUpload(dataLoaded) {
    if (!dataLoaded) {
      tip('Cannot load the file. Please check the data format', false, 'error');
      return;
    }
    const data = JSON.stringify(JSON.parse(dataLoaded), null, 2);
    styleSaverJSON.value = data;
  }
}

function removeStylePreset() {
  if (stylePreset.selectedOptions[0].dataset.system) {
    tip('Cannot remove system preset', false, 'error');
    return;
  }
  localStorage.removeItem('presetStyle');
  localStorage.removeItem(stylePreset.value);
  stylePreset.selectedOptions[0].remove();
  removeStyleButton.style.display = 'none';
}

// GLOBAL FILTERS
mapFilters.addEventListener('click', applyMapFilter);
function applyMapFilter(event) {
  if (event.target.tagName !== 'BUTTON') return;
  const button = event.target;
  svg.attr('data-filter', null).attr('filter', null);
  if (button.classList.contains('pressed')) {
    button.classList.remove('pressed');
    return;
  }
  mapFilters.querySelectorAll('.pressed').forEach((button) => button.classList.remove('pressed'));
  button.classList.add('pressed');
  svg.attr('data-filter', button.id).attr('filter', 'url(#filter-' + button.id + ')');
}

function updateMapFilter() {
  const filter = svg.attr('data-filter');
  mapFilters.querySelectorAll('.pressed').forEach((button) => button.classList.remove('pressed'));
  if (!filter) return;
  mapFilters.querySelector('#' + filter).classList.add('pressed');
}

// FONTS
// fetch default fonts if not done before
function loadDefaultFonts() {
  if (!$('link[href="fonts.css"]').length) {
    $('head').append('<link rel="stylesheet" type="text/css" href="fonts.css">');
    const fontsToAdd = [
      'Amatic+SC:700',
      'IM+Fell+English',
      'Great+Vibes',
      'MedievalSharp',
      'Metamorphous',
      'Nova+Script',
      'Uncial+Antiqua',
      'Underdog',
      'Caesar+Dressing',
      'Bitter',
      'Yellowtail',
      'Montez',
      'Shadows+Into+Light',
      'Fredericka+the+Great',
      'Orbitron',
      'Dancing+Script:700',
      'Architects+Daughter',
      'Kaushan+Script',
      'Gloria+Hallelujah',
      'Satisfy',
      'Comfortaa:700',
      'Cinzel'
    ];
    fontsToAdd.forEach(function (f) {
      if (fonts.indexOf(f) === -1) fonts.push(f);
    });
    updateFontOptions();
  }
}

function fetchFonts(url) {
  return new Promise((resolve, reject) => {
    if (url === '') {
      tip('Use a direct link to any @font-face declaration or just font name to fetch from Google Fonts');
      return;
    }
    if (url.indexOf('http') === -1) {
      url = url.replace(url.charAt(0), url.charAt(0).toUpperCase()).split(' ').join('+');
      url = 'https://fonts.googleapis.com/css?family=' + url;
    }
    const fetched = addFonts(url).then((fetched) => {
      if (fetched === undefined) {
        tip('Cannot fetch font for this value!', false, 'error');
        return;
      }
      if (fetched === 0) {
        tip('Already in the fonts list!', false, 'error');
        return;
      }
      updateFontOptions();
      if (fetched === 1) {
        tip('Font ' + fonts[fonts.length - 1] + ' is fetched');
      } else if (fetched > 1) {
        tip(fetched + ' fonts are added to the list');
      }
      resolve(fetched);
    });
  });
}

function addFonts(url) {
  $('head').append('<link rel="stylesheet" type="text/css" href="' + url + '">');
  return fetch(url)
    .then((resp) => resp.text())
    .then((text) => {
      let s = document.createElement('style');
      s.innerHTML = text;
      document.head.appendChild(s);
      let styleSheet = Array.prototype.filter.call(document.styleSheets, (sS) => sS.ownerNode === s)[0];
      let FontRule = (rule) => {
        let family = rule.style.getPropertyValue('font-family');
        let font = family.replace(/['"]+/g, '').replace(/ /g, '+');
        let weight = rule.style.getPropertyValue('font-weight');
        if (weight && weight !== '400') font += ':' + weight;
        if (fonts.indexOf(font) == -1) {
          fonts.push(font);
          fetched++;
        }
      };
      let fetched = 0;
      for (let r of styleSheet.cssRules) {
        FontRule(r);
      }
      document.head.removeChild(s);
      return fetched;
    })
    .catch(function () {});
}

// Update font list for Label and Burg Editors
function updateFontOptions() {
  styleSelectFont.innerHTML = '';
  for (let i = 0; i < fonts.length; i++) {
    const opt = document.createElement('option');
    opt.value = i;
    const font = fonts[i].split(':')[0].replace(/\+/g, ' ');
    opt.style.fontFamily = opt.innerHTML = font;
    styleSelectFont.add(opt);
  }
}