window.Biomes = (function () {
  const getDefault = () => {
    const name = [
      "Marine",
      "Hot desert",
      "Cold desert",
      "Savanna",
      "Grassland",
      "Tropical seasonal forest",
      "Temperate deciduous forest",
      "Tropical rainforest",
      "Temperate rainforest",
      "Taiga",
      "Tundra",
      "Glacier",
      "Wetland"
    ];

    const color = [
      "#466eab",
      "#fbe79f",
      "#b5b887",
      "#d2d082",
      "#c8d68f",
      "#b6d95d",
      "#29bc56",
      "#7dcb35",
      "#409c43",
      "#4b6b32",
      "#96784b",
      "#d5e7eb",
      "#0b9131"
    ];
    const habitability = [0, 4, 10, 22, 30, 50, 100, 80, 90, 12, 4, 0, 12];
    const iconsDensity = [0, 3, 2, 120, 120, 120, 120, 150, 150, 100, 5, 0, 150];
    const icons = [
      {},
      {dune: 3, cactus: 6, deadTree: 1},
      {dune: 9, deadTree: 1},
      {acacia: 1, grass: 9},
      {grass: 1},
      {acacia: 8, palm: 1},
      {deciduous: 1},
      {acacia: 5, palm: 3, deciduous: 1, swamp: 1},
      {deciduous: 6, swamp: 1},
      {conifer: 1},
      {grass: 1},
      {},
      {swamp: 1}
    ];
    const cost = [10, 200, 150, 60, 50, 70, 70, 80, 90, 200, 1000, 5000, 150]; // biome movement cost
    const biomesMartix = [
      // hot ↔ cold [>19°C; <-4°C]; dry ↕ wet
      new Uint8Array([1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 10]),
      new Uint8Array([3, 3, 3, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 9, 9, 9, 9, 10, 10, 10]),
      new Uint8Array([5, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 9, 9, 9, 9, 9, 10, 10, 10]),
      new Uint8Array([5, 6, 6, 6, 6, 6, 6, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 10, 10, 10]),
      new Uint8Array([7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 9, 9, 9, 9, 9, 9, 9, 10, 10])
    ];

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

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

  return {getDefault};
})();