(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :
  typeof define === 'function' && define.amd ? define(factory) :
  (global.Resources = factory());
}(this, (function () {'use strict';

  // TO-DO
  // apply logic on heightmap edit
  // apply logic on burgs regenearation
  // apply logic on population recalculation

  let cells;

  const getDefault = function() {
    // model: cells eligibility function; chance: chance to get rosource in model-eligible cell
    return [
      {i: 1, name: "Wood", icon: "resource-wood", value: 5, chance: 10, model: "forestAndTaiga", bonus: {fleet: 2, defence: 1}},
      {i: 2, name: "Stone", icon: "resource-stone", value: 4, chance: 7, model: "hills", bonus: {prestige: 1, defence: 2}},
      {i: 3, name: "Marble", icon: "resource-marble", value: 15, chance: 1, model: "mountains", bonus: {prestige: 2}},
      {i: 4, name: "Iron", icon: "resource-iron", value: 8, chance: 8, model: "mountainsAndRareWetland", bonus: {artillery: 1, infantry: 1, defence: 1}},
      {i: 5, name: "Copper", icon: "resource-copper", value: 10, chance: 3, model: "mountains", bonus: {artillery: 2, defence: 1, prestige: 1}},
      {i: 6, name: "Lead", icon: "resource-lead", value: 8, chance: 3, model: "mountains", bonus: {artillery: 1, defence: 1}},
      {i: 7, name: "Silver", icon: "resource-silver", value: 15, chance: 3, model: "mountains", bonus: {prestige: 2}},
      {i: 8, name: "Gold", icon: "resource-gold", value: 30, chance: 1, model: "upperRivers", bonus: {prestige: 3}},
      {i: 9, name: "Grain", icon: "resource-grain", value: 1, chance: 15, model: "habitability", bonus: {population: 4}},
      {i: 10, name: "Сattle", icon: "resource-cattle", value: 2, chance: 10, model: "pasturesAndTemperateForest", bonus: {population: 2}},
      {i: 11, name: "Fish", icon: "resource-fish", value: 1, chance: 5, model: "waterAndRiver", bonus: {population: 2}},
      {i: 12, name: "Game", icon: "resource-game", value: 2, chance: 3, model: "forestAndTaiga", bonus: {archers: 2, population: 1}},
      {i: 13, name: "Wine", icon: "resource-wine", value: 3, chance: 4, model: "tropics", bonus: {population: 1, prestige: 1}},
      {i: 14, name: "Olives", icon: "resource-olives", value: 3, chance: 4, model: "tropics", bonus: {population: 1}},
      {i: 15, name: "Honey", icon: "resource-honey", value: 4, chance: 3, model: "deciduousForestAndTaiga", bonus: {population: 1}},
      {i: 16, name: "Salt", icon: "resource-salt", value: 5, chance: 4, model: "aridLandAndLakes", bonus: {population: 1, defence: 1}},
      {i: 17, name: "Dates", icon: "resource-dates", value: 3, chance: 3, model: "desert", bonus: {population: 1}},
      {i: 18, name: "Horses", icon: "resource-horses", value: 10, chance: 6, model: "grasslandsAndColdDesert", bonus: {cavalry: 2}},
      {i: 19, name: "Elephants", icon: "resource-elephants", value: 15, chance: 2, model: "savannaDesertTropicalForest", bonus: {cavalry: 1}},
      {i: 20, name: "Camels", icon: "resource-camels", value: 13, chance: 4, model: "desert", bonus: {cavalry: 1}},
      {i: 21, name: "Hemp", icon: "resource-hemp", value: 2, chance: 4, model: "forest", bonus: {fleet: 2}},
      {i: 22, name: "Pearls", icon: "resource-pearls", value: 35, chance: 3, model: "tropicalWater", bonus: {prestige: 1}},
      {i: 23, name: "Gemstones", icon: "resource-gemstones", value: 35, chance: 2, model: "mountains", bonus: {prestige: 1}},
      {i: 24, name: "Dyes", icon: "resource-dyes", value: 15, chance: .5, model: "habitableOrWater", bonus: {prestige: 1}},
      {i: 25, name: "Incense", icon: "resource-incense", value: 25, chance: 2, model: "desertAndTropicalForest", bonus: {prestige: 2}},
      {i: 26, name: "Silk", icon: "resource-silk", value: 30, chance: 1, model: "tropicalForest", bonus: {prestige: 2}},
      {i: 27, name: "Spices", icon: "resource-spices", value: 30, chance: 2, model: "tropicalForest", bonus: {prestige: 2}},
      {i: 28, name: "Amber", icon: "resource-amber", value: 15, chance: 2, model: "forestSeashore", bonus: {prestige: 1}},
      {i: 29, name: "Furs", icon: "resource-furs", value: 13, chance: 2, model: "borealForest", bonus: {prestige: 1}},
      {i: 30, name: "Sheeps", icon: "resource-sheeps", value: 2, chance: 5, model: "pasturesAndTemperateForest", bonus: {infantry: 1}},
      {i: 31, name: "Slaves", icon: "resource-slaves", value: 10, chance: 3, model: "lessHabitableSeashore", bonus: {population: 2}},
      {i: 32, name: "Tar", icon: "resource-tar", value: 3, chance: 3, model: "forestAndTaiga", bonus: {fleet: 1}},
      {i: 33, name: "Saltpeter", icon: "resource-saltpeter", value: 8, chance: 2, model: "habitability", bonus: {artillery: 3}},
      {i: 34, name: "Coal", icon: "resource-coal", value: 2, chance: 7, model: "hills", bonus: {artillery: 2}},
      {i: 35, name: "Oil", icon: "resource-oil", value: 5, chance: 2, model: "lessHabitableOrWater", bonus: {artillery: 1}},
      {i: 36, name: "Tropical timber", icon: "resource-tropicalTimber", value: 20, chance: 2, model: "tropicalForest", bonus: {prestige: 1}},
      {i: 37, name: "Whales", icon: "resource-whales", value: 2, chance: 2, model: "colderWaters", bonus: {population: 1}},
      {i: 38, name: "Sugar", icon: "resource-sugar", value: 3, chance: 3, model: "tropicalForest", bonus: {population: 1}},
      {i: 39, name: "Tea", icon: "resource-tea", value: 10, chance: 2, model: "tropicalForest", bonus: {prestige: 1}},
      {i: 40, name: "Tobacco", icon: "resource-tobacco", value: 10, chance: 2, model: "tropicalForest", bonus: {prestige: 1}},
    ]
  }

  const chance = v => {
    if (v < .01) return false;
    if (v > 99.99) return true;
    return v / 100 > Math.random();
  }

  const temp = i => grid.cells.temp[pack.cells.g[i]];
  const group = i => pack.features[cells.f[i]].group;

  const models = {
    forest: i => [6, 7, 8].includes(cells.biome[i]),
    forestAndTaiga: i => [5, 6, 7, 8, 9].includes(cells.biome[i]),
    deciduousForestAndTaiga: i => [6, 8, 9].includes(cells.biome[i]),
    hills: i => cells.h[i] >= 40 || (cells.h[i] >= 30 && !(i%10)),
    mountains: i => cells.h[i] >= 60 || (cells.h[i] >= 40 && !(i%10)),
    mountainsAndRareWetland: i => cells.h[i] >= 60 || (cells.biome[i] === 12 && !(i%8)),
    upperRivers: i => cells.h[i] >= 40 && cells.r[i],
    habitability: i => chance(biomesData.habitability[cells.biome[i]]),
    waterAndRiver: i => (cells.t[i] < 0 && (group(i) === "freshwater" || group(i) === "salt")) || (cells.t[i] > 0 && cells.t[i] < 3 && cells.r[i]),
    pasturesAndTemperateForest: i => chance(100 - cells.h[i]) && chance([0, 0, 0, 100, 100, 20, 80, 0, 0, 0, 0, 0, 0][cells.biome[i]]),
    tropics: i => [5, 7].includes(cells.biome[i]),
    aridLandAndLakes: i => chance([0, 80, 60, 0, 0, 0, 0, 0, 0, 0, 0, 0, 10][cells.biome[i]]) || group(i) === "salt" || group(i) === "dry",
    desert: i => cells.biome[i] === 1 || cells.biome[i] === 2,
    grasslandsAndColdDesert: i => cells.biome[i] === 3 || (!(i%4) && cells.biome[i] === 2),
    savannaDesertTropicalForest: i => [1, 3, 5, 7].includes(cells.biome[i]),
    desertAndTropicalForest: i => [1, 7].includes(cells.biome[i]),
    tropicalForest: i => cells.biome[i] === 7,
    tropicalWater: i => cells.t[i] === -1 && temp(i) >= 18,
    subAndTropicalWater: i => cells.t[i] === -1 && temp(i) >= 14,
    habitableOrWater: i => biomesData.habitability[cells.biome[i]] || cells.t[i] === -1,
    forestSeashore: i => cells.t[i] === 1 && [6, 7, 8, 9].includes(cells.biome[i]),
    borealForest: i => chance([0, 0, 0, 0, 0, 0, 20, 0, 20, 100, 50, 0, 10][cells.biome[i]]),
    lessHabitableSeashore: i => cells.t[i] === 1 && chance([0, 50, 30, 30, 20, 10, 10, 20, 10, 20, 10, 0, 5][cells.biome[i]]),
    lessHabitableOrWater: i => chance([5, 80, 30, 10, 20, 5, 5, 5, 5, 30, 90, 0, 5][cells.biome[i]]),
    colderWaters: i => cells.t[i] < 0 && temp(i) < 8,
  }

  // Biomes: 0: Marine, 1: Hot desert, 2: Cold desert, 3: Savanna, 4: Grassland,
  //         5: Tropical seasonal forest, 6: Temperate deciduous forest, 7: Tropical rainforest,
  //         8: Temperate rainforest, 9: Taiga, 10: Tundra, 11: Glacier, 12: Wetland

  const generate = function() {
    console.time("generateResources");
    cells = pack.cells;
    cells.resource = new Uint8Array(cells.i.length); // resources array [0, 255]
    const resourceMaxCells = Math.ceil(200 * cells.i.length / 5000);

    pack.resources = getDefault().map(resource => {
      resource.cells = 0;
      return resource;
    });

    const shuffledCells = d3.shuffle(cells.i.slice());
    for (const i of shuffledCells) {
      if (!(i%10)) d3.shuffle(pack.resources);
      if (cells.biome[i] === 11) continue; // ignore glaciers
      const rnd = Math.random() * 100;

      for (const resource of pack.resources) {
        if (resource.cells >= resourceMaxCells) continue
        if (!models[resource.model](i)) continue;
        if (resource.cells >= resource.chance && rnd > resource.chance) continue;

        cells.resource[i] = resource.i;
        resource.cells++;
        break;
      }

    }

    console.timeEnd("generateResources");
    console.table(pack.resources.sort((a, b) => a.i > b.i ? 1 : -1));
  }

  const draw = function() {
    let resourcesHTML = "";
    for (const i of cells.i) {
      if (!cells.resource[i]) continue;
      //if (cells.resource[i] !== 38) continue;
      const resource = pack.resources.find(resource => resource.i === cells.resource[i]);
      const [x, y] = cells.p[i];
      resourcesHTML += `<use data-i="${resource.i}" href="#${resource.icon}" x="${x-3}" y="${y-3}" width="6" height="6"/>`;
    }

    goods.html(resourcesHTML);
  }

return {generate, getDefault, draw};

})));