/**
 * Sprites ingrédients — parsing de `ingredient-sprites.bentext` et résolution
 * alias → coordonnées pixel sur la planche. Pure, sans effet de bord.
 *
 * Format de `ingredient-sprites.bentext` :
 *   ---                (séparateur de blocs)
 *   <row> <col>        (coordonnées dans la grille, taille de cellule = INGREDIENT_SPRITE_CELL)
 *   alias 1 | alias 2  (synonymes séparés par `|`, lignes supplémentaires acceptées)
 *   ---
 *   ...
 *
 * Sortie de `parseIngredientSpritesBentext` :
 *   - byAlias : { [aliasLower]: { x, y, X, y: y } }
 *   - preferredAliases : Set<aliasLower> (alias des lignes « prioritaires »)
 *   - csv : rendu CSV (compat / rétro pour les outils existants)
 */

export const INGREDIENT_SPRITE_CELL = 32;

/** Lignes de tuiles « prioritaires » pour la carte variante (aligné sur l’ancienne grille CSV). */
export const PREFERRED_VARIANT_SPRITE_ROWS = new Set([8, 9, 10, 12, 13, 14, 15, 16]);

const normalizeIngredientAliasKey = (s) => s.trim().toLowerCase().replace(/\s+/g, " ");

const foldAccents = (s) => s.normalize("NFD").replace(/\p{M}+/gu, "").toLowerCase();

/**
 * Parse `ingredient-sprites.bentext` : blocs `---` puis ligne `row col`, puis alias (`|` = synonymes).
 */
const parseIngredientSpritesBentext = (raw) => {
  const byAlias = {};
  const preferredAliases = new Set();
  const grid = new Map();

  const chunks = raw
    .replace(/^\uFEFF/, "")
    .trim()
    .split(/\r?\n---\r?\n/);
  for (const chunk of chunks) {
    const trimmedChunk = chunk.trim();
    if (!trimmedChunk) continue;
    const lines = trimmedChunk
      .split(/\r?\n/)
      .map((l) => l.trim())
      .filter((l) => l.length > 0);
    if (lines.length < 2) continue;
    const coordMatch = lines[0].match(/^(\d+)\s+(\d+)/);
    if (!coordMatch) {
      if (lines[0] === "---") continue;
      console.warn(`[build-recipes] Bloc sprite ignoré (coords invalides): ${lines[0].slice(0, 48)}`);
      continue;
    }
    const row = Number(coordMatch[1]);
    const col = Number(coordMatch[2]);
    const x = col * INGREDIENT_SPRITE_CELL;
    const y = row * INGREDIENT_SPRITE_CELL;
    const entry = { x, y, X: x, Y: y };

    const aliasLines = lines.slice(1);
    const cellText = aliasLines.join("|");
    const ck = `${row},${col}`;
    grid.set(ck, grid.has(ck) ? `${grid.get(ck)}|${cellText}` : cellText);

    const isPreferredRow = PREFERRED_VARIANT_SPRITE_ROWS.has(row);

    for (const line of aliasLines) {
      for (const part of line.split("|")) {
        const key = normalizeIngredientAliasKey(part);
        if (!key) continue;
        const prev = byAlias[key];
        if (!prev) {
          byAlias[key] = entry;
        } else if (prev.x !== x || prev.y !== y) {
          console.warn(
            `[build-recipes] Alias sprite « ${key} » en conflit (${prev.x},${prev.y}) vs (${x},${y}) — première définition conservée.`
          );
          continue;
        }
        if (isPreferredRow) preferredAliases.add(key);
      }
    }
  }

  let maxR = 0;
  let maxC = 0;
  for (const k of grid.keys()) {
    const [r, c] = k.split(",").map(Number);
    maxR = Math.max(maxR, r);
    maxC = Math.max(maxC, c);
  }
  const csvLines = [];
  for (let r = 0; r <= maxR; r++) {
    const cols = [];
    for (let c = 0; c <= maxC; c++) {
      cols.push(grid.get(`${r},${c}`) ?? "");
    }
    csvLines.push(cols.join(","));
  }
  const csv = `${csvLines.join("\n")}\n`;

  return { byAlias, preferredAliases, csv };
};

const resolveIconPxForIngredientName = (name, byAlias) => {
  if (!name || typeof name !== "string") return null;
  const n = normalizeIngredientAliasKey(name);
  if (byAlias[n]) return aliasToIconPx(byAlias, n);
  const nFold = foldAccents(n);
  for (const key of Object.keys(byAlias)) {
    if (foldAccents(key) === nFold) return aliasToIconPx(byAlias, key);
  }
  const segments = n.split(/[,;]|(?:\s+\/\s+)|(?:\s+et\s+)/i).map((s) => s.trim()).filter(Boolean);
  for (const seg of segments) {
    if (byAlias[seg]) return aliasToIconPx(byAlias, seg);
    const sf = foldAccents(seg);
    for (const key of Object.keys(byAlias)) {
      if (foldAccents(key) === sf) return aliasToIconPx(byAlias, key);
    }
  }
  const keysSorted = Object.keys(byAlias).sort((a, b) => b.length - a.length);
  for (const k of keysSorted) {
    if (k.length < 3) continue;
    if (n.includes(k) || nFold.includes(foldAccents(k))) return aliasToIconPx(byAlias, k);
  }
  return null;
};

/** Lit les coordonnées pixel dans `byAlias` (API : `X`/`Y` ou `x`/`y`). */
const aliasToIconPx = (byAlias, alias) => {
  if (!byAlias || typeof alias !== "string") return null;
  const entry = byAlias[alias];
  if (!entry || typeof entry !== "object") return null;
  const x = typeof entry.x === "number" ? entry.x : typeof entry.X === "number" ? entry.X : NaN;
  const y = typeof entry.y === "number" ? entry.y : typeof entry.Y === "number" ? entry.Y : NaN;
  if (!Number.isFinite(x) || !Number.isFinite(y)) return null;
  return { x, y };
};

/** Alias manifeste correspondant à des coordonnées exactes sur la planche (pour filtrer les tuiles). */
const findAliasForIconPx = (byAlias, px) => {
  if (!byAlias || !px || typeof px.x !== "number" || typeof px.y !== "number") return null;
  for (const [alias, entry] of Object.entries(byAlias)) {
    if (!entry || typeof entry !== "object") continue;
    const x = typeof entry.x === "number" ? entry.x : typeof entry.X === "number" ? entry.X : NaN;
    const y = typeof entry.y === "number" ? entry.y : typeof entry.Y === "number" ? entry.Y : NaN;
    if (px.x === x && px.y === y) return alias;
  }
  return null;
};

const isPreferredVariantAlias = (preferredSet, manifestAlias) => {
  if (!manifestAlias || preferredSet.size === 0) return false;
  const lo = manifestAlias.trim().toLowerCase();
  if (preferredSet.has(lo)) return true;
  return [...preferredSet].some((p) => p.toLowerCase() === lo);
};

const buildIngredientCoverSprite = (iconPx, sheet) => {
  if (!iconPx || typeof iconPx.x !== "number" || typeof iconPx.y !== "number" || !sheet) {
    return null;
  }
  const col = Math.round(iconPx.x / INGREDIENT_SPRITE_CELL);
  const row = Math.round(iconPx.y / INGREDIENT_SPRITE_CELL);
  return {
    sheet: "/ingredients.png",
    col,
    row,
    cell: INGREDIENT_SPRITE_CELL,
    sheetWidth: sheet.width,
    sheetHeight: sheet.height
  };
};

export {
  parseIngredientSpritesBentext,
  resolveIconPxForIngredientName,
  aliasToIconPx,
  findAliasForIconPx,
  isPreferredVariantAlias,
  buildIngredientCoverSprite,
  normalizeIngredientAliasKey,
  foldAccents
};