// Rôle : charge et normalise les données publiques des jeux.
export const INITIAL_MHWILDS_STATE = {
  loaded: false,
  loading: false,
  error: "",
  translations: {},
  monsters: [],
  endemic: [],
  lists: [],
  filterOptions: { monsters: [], endemic: [] },
  filterOptionKeys: { monsters: "", endemic: "" }
};

export const INITIAL_DIABLO4_STATE = {
  loaded: false,
  loading: false,
  error: "",
  affixes: [],
  filterOptions: { affixes: [] },
  categoryMap: {},
  filterOptionKeys: { affixes: "" }
};

export async function loadMhwildsData() {
  const [monstersResponse, endemicResponse, listIndexResponse, translationsResponse] = await Promise.all([
    fetch("/data/mhwilds/monsters.json"),
    fetch("/data/mhwilds/endemic_life.json"),
    fetch("/data/mhwilds/lists/index.json"),
    fetch("/data/mhwilds/i18n/fr.json")
  ]);

  if (!monstersResponse.ok || !endemicResponse.ok || !listIndexResponse.ok || !translationsResponse.ok) {
    throw new Error("Impossible de charger les données Monster Hunter Wilds.");
  }

  const [monstersJson, endemicJson, listIndexJson, translations] = await Promise.all([
    monstersResponse.json(),
    endemicResponse.json(),
    listIndexResponse.json(),
    translationsResponse.json()
  ]);
  const lists = await loadGameLists("mhwilds", listIndexJson);
  const monsterFilterKey = Object.keys(monstersJson).find((key) => key !== "monsters") || "";
  const endemicFilterKey = Object.keys(endemicJson).find((key) => key !== "endemicLife" && key !== "aquaticLife") || "";

  return {
    loaded: true,
    loading: false,
    error: "",
    translations,
    monsters: monstersJson.monsters || [],
    endemic: [...(endemicJson.endemicLife || []), ...(endemicJson.aquaticLife || [])],
    lists,
    filterOptions: {
      monsters: monstersJson[monsterFilterKey] || [],
      endemic: endemicJson[endemicFilterKey] || []
    },
    filterOptionKeys: {
      monsters: monsterFilterKey,
      endemic: endemicFilterKey
    }
  };
}

async function loadGameLists(gameId, indexPayload) {
  const entries = Array.isArray(indexPayload?.lists) ? indexPayload.lists : [];
  const results = await Promise.all(entries.map(async (entry) => {
    const response = await fetch(`/data/${gameId}/lists/${entry.file}`);
    if (!response.ok) throw new Error(`Impossible de charger la liste ${entry.file}.`);
    const payload = await response.json();
    return normalizeGameListFile(entry, payload);
  }));
  return results;
}

function normalizeGameListFile(entry, payload) {
  const id = String(entry?.id || entry?.file || "").replace(/\.json$/i, "");
  const categories = Object.entries(payload || {}).filter(([, items]) => Array.isArray(items)).map(([categoryId, items]) => ({
    id: categoryId,
    title: formatListTitle(categoryId),
    items: Array.isArray(items) ? items.map(normalizeGameListItem).filter((item) => item.name) : []
  })).filter((category) => category.items.length);

  return {
    id,
    title: payload?.titre || entry?.title || formatListTitle(id),
    file: entry?.file || `${id}.json`,
    categories,
    itemCount: categories.reduce((count, category) => count + category.items.length, 0)
  };
}

function normalizeGameListItem(item) {
  const hasQuantity = item?.quantite !== undefined || item?.quantity !== undefined;
  const quantity = Number.parseInt(item?.quantite ?? item?.quantity ?? 1, 10);
  return {
    name: String(item?.nom || item?.name || item?.label || "").trim(),
    description: String(item?.description || item?.quete || item?.quest || item?.source || "").trim(),
    quantity: Number.isFinite(quantity) ? quantity : 1,
    hasQuantity
  };
}

function formatListTitle(value) {
  return String(value || "")
    .replace(/_/g, " ")
    .replace(/\b\p{L}/gu, (letter) => letter.toUpperCase());
}

export async function loadDiablo4Data() {
  const response = await fetch("/data/diablo4/affixes_types.json");
  if (!response.ok) throw new Error("Impossible de charger les données Diablo IV.");

  const payload = await response.json();
  const filterKey = Object.keys(payload).find((key) => key !== "affixes") || "";
  const categories = payload[filterKey] || [];

  return {
    loaded: true,
    loading: false,
    error: "",
    affixes: payload.affixes || [],
    filterOptions: { affixes: categories },
    categoryMap: Object.fromEntries(categories.map((category) => [category.id, category])),
    filterOptionKeys: { affixes: filterKey }
  };
}