/**
 * Level system — 100 levels per game, deterministic seeds, graduated difficulty.
 *
 * Seed strategy: level N → synthetic date "LEVEL-{game}-{N:03d}"
 * Each generator uses date.split("-").reduce(…) to derive a numeric seed,
 * so we pass a date-shaped string that yields a unique seed per (game, level).
 *
 * Level N → date string: `${1900 + N}-01-01`
 * This stays far from real daily dates (2024+) and is unique per level.
 */

export const GAMES = ["queens", "tango", "zip", "sudoku", "patches"] as const;
export type GameId = typeof GAMES[number];

export const TOTAL_LEVELS = 100;

/** Convert level number (1–100) to the synthetic date fed to the generator. */
export function levelToDate(level: number): string {
  const n = Math.max(1, Math.min(TOTAL_LEVELS, level));
  // e.g. level 1 → "1901-01-01", level 42 → "1942-01-01", level 100 → "2000-01-01"
  return `${1900 + n}-01-01`;
}

/** Queens: N scales 6→10 across 100 levels. */
export function queensSizeForLevel(level: number): number {
  if (level <= 15) return 6;
  if (level <= 35) return 7;
  if (level <= 60) return 8;
  if (level <= 80) return 9;
  return 10;
}

/** Zip: grid size scales with level. */
export function zipSizeForLevel(level: number): number {
  if (level <= 20) return 5;
  if (level <= 50) return 6;
  if (level <= 75) return 7;
  return 8;
}

export interface LevelMeta {
  level: number;
  difficulty: 1 | 2 | 3 | 4 | 5; // 1=easy … 5=expert
  difficultyLabel: string;
}

const DIFFICULTY_LABELS = ["", "Facile", "Normal", "Intermédiaire", "Difficile", "Expert"];

export function levelMeta(game: GameId, level: number): LevelMeta {
  let difficulty: 1 | 2 | 3 | 4 | 5;
  if (game === "queens") {
    if (level <= 15) difficulty = 1;
    else if (level <= 35) difficulty = 2;
    else if (level <= 60) difficulty = 3;
    else if (level <= 80) difficulty = 4;
    else difficulty = 5;
  } else if (game === "zip") {
    if (level <= 20) difficulty = 1;
    else if (level <= 50) difficulty = 2;
    else if (level <= 75) difficulty = 3;
    else if (level <= 90) difficulty = 4;
    else difficulty = 5;
  } else {
    // Tango, Sudoku, Patches: fixed size, difficulty is nominal
    if (level <= 20) difficulty = 1;
    else if (level <= 45) difficulty = 2;
    else if (level <= 65) difficulty = 3;
    else if (level <= 85) difficulty = 4;
    else difficulty = 5;
  }
  return { level, difficulty, difficultyLabel: DIFFICULTY_LABELS[difficulty] };
}

export const GAME_META: Record<GameId, { name: string; accent: string; desc: string; subtitle: string; duration: string; symbol: string }> = {
  queens:  { name: "Queens",  accent: "#d97706", desc: "Une couronne par ligne, colonne et zone colorée.",    subtitle: "1 couronne par ligne, colonne et zone",           duration: "≈ 3 min", symbol: "♛" },
  tango:   { name: "Tango",   accent: "#ea580c", desc: "Équilibrez soleils et lunes selon les contraintes.", subtitle: "Équilibre soleils ☀ et lunes ◐ sur la grille",    duration: "≈ 2 min", symbol: "☀" },
  zip:     { name: "Zip",     accent: "#2563eb", desc: "Reliez les chiffres dans l'ordre en couvrant tout.", subtitle: "Relie les chiffres dans l'ordre en couvrant tout", duration: "≈ 2 min", symbol: "∞" },
  sudoku:  { name: "Sudoku",  accent: "#16a34a", desc: "Chiffres 1–6 dans chaque ligne, colonne et bloc.",  subtitle: "Chiffres 1–6 dans chaque ligne, colonne et bloc",  duration: "≈ 4 min", symbol: "#" },
  patches: { name: "Patches", accent: "#7c3aed", desc: "Remplissez chaque zone selon sa forme et sa taille.", subtitle: "Remplis chaque zone avec les bonnes pièces",      duration: "≈ 3 min", symbol: "▦" },
};