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

// 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 (sel == "routes" || sel == "labels" || sel === "coastline" || sel == "lakes" || sel == "anchors" || sel == "burgIcons" || sel == "borders") {
    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
    styleOpacity.style.display = "block";
    styleOpacityInput.value = styleOpacityOutput.value = el.attr("opacity") || 1;

    // filter
    styleFilter.style.display = "block";
    if (sel == "ocean") el = oceanLayers;
    styleFilterInput.value = el.attr("filter") || "";
  }

  if (sel == "ocean") el = oceanLayers.select("rect");

  // fill
  if (sel === "rivers" || sel === "lakes" || sel === "landmass" || sel === "prec" || sel === "fogging") {
    styleFill.style.display = "block";
    styleFillInput.value = styleFillOutput.value = el.attr("fill");
  }

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

  // stroke width
  if (sel === "fogging") {
    styleStrokeWidth.style.display = "block";
    styleStrokeWidthInput.value = styleStrokeWidthOutput.value = el.attr("stroke-width") || "";
  }

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

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

  // show specific sections
  if (sel === "gridOverlay") styleGrid.style.display = "block";
  if (sel === "texture") styleTexture.style.display = "block";
  if (sel === "routes" || sel === "labels" || sel == "anchors" || sel == "burgIcons" || sel === "coastline" || sel === "lakes" || sel === "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") {
    styleShift.style.display = "block";
    styleGridType.value = el.attr("type");
    styleGridSize.value = el.attr("size");
    calculateFriendlyGridSize();
    const tr = parseTransform(el.attr("transform"));
    styleShiftX.value = tr[0];
    styleShiftY.value = tr[1];
  }

  if (sel === "compass") {
    styleCompass.style.display = "block";
    const tr = parseTransform(d3.select("#rose").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 == "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") || .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") || .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") || .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";
    styleOceanBack.value = styleOceanBackOutput.value = d3.color(svg.style("background-color")).hex();
    styleOceanFore.value = styleOceanForeOutput.value = oceanLayers.select("#oceanBase").attr("fill");
    styleOceanPattern.value = svg.select("#oceanicPattern").attr("filter");
    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") || .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");
  }

  // update group options
  styleGroupSelect.options.length = 0; // remove all options
  if (sel === "routes" || sel === "labels" || sel === "coastline" || sel === "lakes" || sel === "anchors" || sel === "burgIcons" || sel === "borders") {
    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);
});

styleStrokeWidthInput.addEventListener("input", function() {
  styleStrokeWidthOutput.value = this.value;
  getEl().attr('stroke-width', +this.value);
});

styleStrokeDasharrayInput.addEventListener("input", function() {
  getEl().attr('stroke-dasharray', this.value);
});

styleStrokeLinecapInput.addEventListener("change", function() {
  getEl().attr('stroke-linecap', this.value);
});

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", "");
  else if (this.value === "default") texture.select("image").attr("xlink:href", getDefaultTexture());
  else setBase64Texture(this.value);
});

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();
});

styleGridSize.addEventListener("input", function() {
  getEl().attr("size", this.value);
  if (layerIsOn("toggleGrid")) drawGrid();
  calculateFriendlyGridSize();
});

function calculateFriendlyGridSize() {
  const square = styleGridType.value === "square";
  const size = square ? styleGridSize.value : styleGridSize.value * Math.cos(30 * Math.PI / 180) * 2;
  const friendly = `${rn(size * distanceScaleInput.value, 2)} ${distanceUnitInput.value}`;
  styleGridSizeFriendly.value = friendly;
}

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();
});

styleOceanBack.addEventListener("input", function() {
  svg.style("background-color", this.value);
  styleOceanBackOutput.value = this.value;
});

styleOceanFore.addEventListener("input", function() {
  oceanLayers.select("rect").attr("fill", this.value);
  styleOceanForeOutput.value = this.value;
});

styleOceanPattern.addEventListener("change", function() {
  svg.select("#oceanicPattern").attr("filter", 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})`;
  d3.select("#rose").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") * .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 ** .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), .2);
  changeRadius(size);
});

styleRadiusMinus.addEventListener("click", function() {
  const size = Math.max(rn(getEl().attr("size") * .9, 2), .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), .2);
  changeIconSize(size);
});

styleIconSizeMinus.addEventListener("click", function() {
  const size = Math.max(rn(getEl().attr("size") * .9, 2), .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);
});

// 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: 24em" placeholder="http://www.example.com/image.jpg" oninput="fetchTextureURL(this.value)">
                            <div style="border: 1px solid darkgrey; height: 144px; margin-top: 2px"><canvas id="preview" width="256px" height="144px"></canvas></div>`;
  $("#alert").dialog({resizable: false, title: "Load custom texture", width: "26em",
    buttons: {
      Apply: function() {
        const name = textureURL.value.split("/").pop();
        if (!name || name === "") {tip("Please provide a valid URL", false, "error"); return;}
        const opt = document.createElement("option");
        opt.value = textureURL.value;
        opt.text = name.slice(0, 20);
        styleTextureInput.add(opt);
        styleTextureInput.value = textureURL.value;
        setBase64Texture(textureURL.value);
        zoom.scaleBy(svg, 1.00001); // enforce browser re-draw
        $(this).dialog("close");
      },
      Cancel: function() {$(this).dialog("close");}
    }
  });
}

function setBase64Texture(url) {
  const xhr = new XMLHttpRequest();
  xhr.onload = function() {
    const reader = new FileReader();
    reader.onloadend = function() {
      texture.select("image").attr("xlink:href", reader.result);
    }
    reader.readAsDataURL(xhr.response);
  };
  xhr.open('GET', url);
  xhr.responseType = 'blob';
  xhr.send();
};

function fetchTextureURL(url) {
  console.log("Provided URL is", url);
  const img = new Image();
  img.onload = function () {
    const canvas = document.getElementById("preview");
    const ctx = canvas.getContext("2d");
    ctx.clearRect(0, 0, canvas.width, canvas.height);
    ctx.drawImage(img, 0, 0, canvas.width, canvas.height);
  };
  img.src = url;
}

// apply default or custom style settings on load
function applyStyleOnLoad() {
  addDefaulsStyles(); // add FMG system styles to localStorage

  const preset = localStorage.getItem("presetStyle");
  const style = preset ? localStorage.getItem(preset) : null;

  if (preset && style && JSON.isValid(style)) {
    applyStyle(JSON.parse(style));
    updateMapFilter();
    loadDefaultFonts();
    stylePreset.value = preset;
    stylePreset.dataset.old = preset;
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  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", .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", .7).attr("stroke", "#404040").attr("stroke-width", .7).attr("filter", null);
  cults.attr("opacity", .6).attr("stroke", "#777777").attr("stroke-width", .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", .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", .5).attr("fill", "#a6c1fd").attr("stroke", "#5f799d").attr("stroke-width", .7).attr("filter", null);
  lakes.select("#salt").attr("opacity", .5).attr("fill", "#409b8a").attr("stroke", "#388985").attr("stroke-width", .7).attr("filter", null);
  lakes.select("#sinkhole").attr("opacity", 1).attr("fill", "#5bc9fd").attr("stroke", "#53a3b0").attr("stroke-width", .7).attr("filter", null);
  lakes.select("#frozen").attr("opacity", .95).attr("fill", "#cdd4e7").attr("stroke", "#cfe0eb").attr("stroke-width", 0).attr("filter", null);
  lakes.select("#lava").attr("opacity", .7).attr("fill", "#90270d").attr("stroke", "#f93e0c").attr("stroke-width", 2).attr("filter", "url(#crumpled)");

  coastline.select("#sea_island").attr("opacity", .5).attr("stroke", "#1f3846").attr("stroke-width", .7).attr("auto-filter", 1).attr("filter", "url(#dropShadow)");
  coastline.select("#lake_island").attr("opacity", 1).attr("stroke", "#7c8eaf").attr("stroke-width", .35).attr("filter", null);

  terrain.attr("opacity", null).attr("set", "simple").attr("size", 1).attr("density", .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", .9).attr("stroke", "#d06324").attr("stroke-width", .7).attr("stroke-dasharray", "2").attr("stroke-linecap", "butt").attr("filter", null).attr("mask", null);
  trails.attr("opacity", .9).attr("stroke", "#d06324").attr("stroke-width", .25).attr("stroke-dasharray", ".8 1.6").attr("stroke-linecap", "butt").attr("filter", null).attr("mask", null);
  searoutes.attr("opacity", .8).attr("stroke", "#ffffff").attr("stroke-width", .45).attr("stroke-dasharray", "1 2").attr("stroke-linecap", "round").attr("filter", null).attr("mask", null);

  regions.attr("opacity", .4).attr("filter", null);
  statesHalo.attr("data-width", 10).attr("stroke-width", 10).attr("opacity", 1);
  provs.attr("opacity", .6).attr("filter", null);

  temperature.attr("opacity", null).attr("fill", "#000000").attr("stroke-width", 1.8).attr("fill-opacity", .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", .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);
  ocean.attr("opacity", null);
  oceanLayers.select("rect").attr("fill", "#53679f");
  oceanLayers.attr("filter", null).attr("layers", "-6,-3,-1");
  oceanPattern.attr("opacity", null);
  svg.select("#oceanicPattern").attr("filter", "url(#pattern1)");

  // 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", .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", .24).attr("fill", "#ffffff").attr("stroke", "#3e3e4b").attr("fill-opacity", .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", .5).attr("stroke-width", .12).attr("fill", "#ffffff").attr("stroke", "#3e3e4b").attr("fill-opacity", .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", .8).attr("fill", "#000000").attr("stroke-width", 5);
}

// 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) {tip("Please exit the customization mode first", false, "error"); return;}
  alertMessage.innerHTML = "Are you sure you want to change the style preset? All unsaved style changes will be lost";
  $("#alert").dialog({resizable: false, title: "Change style preset", width: "23em",
    buttons: {
      Change: function() {
        const stored = localStorage.getItem(preset);
        const style = JSON.isValid(stored) ? JSON.parse(stored) : null;
        if (preset === "styleDefault" || !style) applyDefaultStyle(); else applyStyle(style);
        if (preset !== "styleDefault" && !style) tip("Cannot parse stored style JSON. Default style is applied", false, "error", 5000);
        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
        $(this).dialog("close");
      },
      Cancel: function() {
        stylePreset.value = stylePreset.dataset.old;
        $(this).dialog("close");
      }
    }
  });
}

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 * .47, 2));
      this.setAttribute("y", rn(y- size * .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"],
      "#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", "size", "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"],
      "#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", "filter"],
      "#temperature":["opacity", "font-size", "fill", "fill-opacity", "stroke", "stroke-width", "stroke-dasharray", "stroke-linecap", "filter"],
      "#texture":["opacity", "filter", "mask"],
      "#textureImage":["x", "y"],
      "#zones":["opacity", "stroke", "stroke-width", "stroke-dasharray", "stroke-linecap", "filter", "mask"],
      "#ocean":["opacity"],
      "#oceanLayers":["filter", "layers"],
      "#oceanBase":["fill"],
      "#oceanPattern":["opacity"],
      "#oceanicPattern":["filter"],
      "#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-cont":["opacity", "fill", "stroke-width"]
    };

    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 !== "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);
  }
}