HokmPlay/src/lib/online/gamification.ts

// Pure gamification rules: ranks/leagues, rating, XP/levels, coins,
// daily rewards, achievements. No side effects, no storage — unit-testable.

import {
  AVATARS,
  GIFT_TIERS,
  AchievementCategoryDef,
  AchievementCategoryId,
  AchievementDef,
  AchievementMetric,
  AchievementUnlock,
  CardBackDef,
  CardFrontDef,
  LeagueInfo,
  MatchLeague,
  MatchSummary,
  PlayerStats,
  RankTier,
  RankTierId,
  ReactionPackDef,
  RewardResult,
  StickerPackDef,
  TitleDef,
  TitleUnlock,
  UserProfile,
} from "./types";

/* ------------------------------- Ranks ------------------------------- */

export const RANK_TIERS: RankTier[] = [
  { id: "bronze", nameFa: "برنز", nameEn: "Bronze", floor: 0, color: "#cd7f32" },
  { id: "silver", nameFa: "نقره", nameEn: "Silver", floor: 1100, color: "#c0c7d0" },
  { id: "gold", nameFa: "طلا", nameEn: "Gold", floor: 1300, color: "#e6b800" },
  { id: "platinum", nameFa: "پلاتین", nameEn: "Platinum", floor: 1500, color: "#46c2c2" },
  { id: "diamond", nameFa: "الماس", nameEn: "Diamond", floor: 1700, color: "#6aa6ff" },
  { id: "master", nameFa: "استاد", nameEn: "Master", floor: 1900, color: "#c77dff" },
];

const ROMAN = ["", "I", "II", "III"];

export function divisionLabel(division: number | null): string {
  if (division == null) return "";
  return ROMAN[division] ?? "";
}

export function tierById(id: RankTierId): RankTier {
  return RANK_TIERS.find((t) => t.id === id) ?? RANK_TIERS[0];
}

export function getLeagueInfo(rating: number): LeagueInfo {
  const r = Math.max(0, Math.round(rating));
  let idx = 0;
  for (let i = 0; i < RANK_TIERS.length; i++) {
    if (r >= RANK_TIERS[i].floor) idx = i;
  }
  const tier = RANK_TIERS[idx];
  const isLast = idx === RANK_TIERS.length - 1;

  if (isLast) {
    return { tier, division: null, rating: r, nextThreshold: null, progress: 1 };
  }

  const nextTierFloor = RANK_TIERS[idx + 1].floor;
  const band = nextTierFloor - tier.floor;
  const third = band / 3;
  // division 3 (III) is lowest, 1 (I) is highest
  const within = r - tier.floor;
  let division: number;
  let divStart: number;
  let divEnd: number;
  if (within < third) {
    division = 3;
    divStart = tier.floor;
    divEnd = tier.floor + third;
  } else if (within < 2 * third) {
    division = 2;
    divStart = tier.floor + third;
    divEnd = tier.floor + 2 * third;
  } else {
    division = 1;
    divStart = tier.floor + 2 * third;
    divEnd = nextTierFloor;
  }
  const progress = Math.min(1, Math.max(0, (r - divStart) / (divEnd - divStart)));
  return { tier, division, rating: r, nextThreshold: Math.round(divEnd), progress };
}

/* ------------------------------ Rating ------------------------------- */

const K_FACTOR = 32;

/** Elo-style rating delta for a ranked match (0 for casual). */
export function ratingDelta(
  summary: MatchSummary,
  myRating: number,
  oppRating: number
): number {
  if (!summary.ranked) return 0;
  const expected = 1 / (1 + Math.pow(10, (oppRating - myRating) / 400));
  const score = summary.won ? 1 : 0;
  let delta = K_FACTOR * (score - expected);
  if (summary.won && summary.kotFor) delta += 8;
  if (!summary.won && summary.kotAgainst) delta -= 8;
  const rounded = Math.round(delta);
  // never let a win cost rating or a loss gain it
  if (summary.won) return Math.max(1, rounded);
  return Math.min(-1, rounded);
}

/* ------------------------------- Coins ------------------------------- */

export function coinDelta(summary: MatchSummary): number {
  // Free games (vs computer / private friend rooms) never touch coins.
  if (!summary.ranked) return 0;
  // Forfeit: the surrendering team loses double the stake; the winner takes the stake.
  if (summary.forfeit) return summary.won ? summary.stake : -2 * summary.stake;
  // Ranked: win the stake (+kot bonus scaled to the league), lose the stake.
  // Higher leagues stake more, so wins/losses swing bigger.
  const kotBonus = summary.won && summary.kotFor ? Math.round(summary.stake * 0.4) : 0;
  return (summary.won ? summary.stake : -summary.stake) + kotBonus;
}

/* ----------------------------- Leagues ------------------------------- */

/** Ranked-matchmaking coin entry tiers (the stake you win/lose). */
export const MATCH_LEAGUES: MatchLeague[] = [
  { id: "starter", entry: 100, minLevel: 1, color: "#2dd4bf", icon: "🌱", nameFa: "لیگ شروع", nameEn: "Starter", descFa: "ورود ۱۰۰ سکه — مناسب تازه‌کارها", descEn: "100-coin entry — for newcomers" },
  { id: "pro", entry: 500, minLevel: 10, color: "#e6b800", icon: "⚔️", nameFa: "لیگ حرفه‌ای", nameEn: "Pro", descFa: "ورود ۵۰۰ سکه — برد و باخت بزرگ‌تر", descEn: "500-coin entry — bigger swings" },
  { id: "expert", entry: 1000, minLevel: 20, color: "#c77dff", icon: "👑", nameFa: "لیگ استادان", nameEn: "Expert", descFa: "ورود ۱۰۰۰ سکه — برای حرفه‌ای‌ها", descEn: "1000-coin entry — for the best" },
];

export function leagueById(id: string): MatchLeague {
  return MATCH_LEAGUES.find((l) => l.id === id) ?? MATCH_LEAGUES[0];
}

/** Coin-priced XP packs (XP is intentionally expensive). Server-authoritative. */
export const XP_PACKS: { id: string; xp: number; price: number }[] = [
  { id: "xp1", xp: 200, price: 1500 },
  { id: "xp2", xp: 600, price: 4000 },
  { id: "xp3", xp: 1500, price: 8000 },
];

/* ------------------------------- XP ---------------------------------- */

/** Hard level cap. */
export const MAX_LEVEL = 100;

/** XP required to advance from `level` to `level + 1` — grows with level, so
 *  each level is harder than the last. */
export function xpNeededForLevel(level: number): number {
  return 100 * level + 15 * level * level;
}

/** Higher leagues (bigger stake) grant more XP, so high-level players progress
 *  by playing up rather than grinding the starter league. */
export function leagueXpFactor(stake: number): number {
  if (stake >= 1000) return 2;
  if (stake >= 500) return 1.5;
  return 1;
}

/** XP multiplier for premium (pro) players. */
export const PREMIUM_XP_MULT = 1.5;

/* ----------------------------- Turn time ----------------------------- */

/**
 * How long a player has to act, by league (derived from the coin stake). Higher
 * leagues give LESS time, so stronger players must think faster:
 *   Starter / vs-AI / private (stake < 500) → 15s
 *   Pro league (stake ≥ 500)               → 10s
 *   Expert league (stake ≥ 1000)           → 7s
 * Both the offline client and the live server use this same mapping so the turn
 * clock matches in either mode.
 */
/** Blitz/speed-mode turn time — a flat, fast clock for casual quick games. */
export const SPEED_TURN_MS = 5000;
/** Speed mode races to fewer points so a match is over fast. */
export const SPEED_TARGET_SCORE = 5;

export function turnMsForStake(stake: number, speed = false): number {
  if (speed) return SPEED_TURN_MS;
  if (stake >= 1000) return 7000;
  if (stake >= 500) return 10000;
  return 15000;
}

export function matchXp(summary: MatchSummary): number {
  // Forfeiting (surrendering) earns no XP.
  if (summary.forfeit && !summary.won) return 0;
  // Every game grants XP; the winner earns double.
  const base = 40 + summary.tricksWon * 5 + (summary.kotFor ? 30 : 0);
  return Math.round(base * (summary.won ? 2 : 1) * leagueXpFactor(summary.stake));
}

export interface LevelProgress {
  level: number;
  xp: number; // xp within the current level
  leveledUp: boolean;
}

export function addXp(level: number, xpInLevel: number, gained: number): LevelProgress {
  let lvl = level;
  let xp = xpInLevel + gained;
  let leveledUp = false;
  while (lvl < MAX_LEVEL && xp >= xpNeededForLevel(lvl)) {
    xp -= xpNeededForLevel(lvl);
    lvl += 1;
    leveledUp = true;
  }
  // At the cap, don't let XP overflow the bar.
  if (lvl >= MAX_LEVEL) {
    lvl = MAX_LEVEL;
    xp = Math.min(xp, xpNeededForLevel(MAX_LEVEL));
  }
  return { level: lvl, xp, leveledUp };
}

/* --------------------------- Achievements ---------------------------- */

export const ACHIEVEMENT_CATEGORIES: AchievementCategoryDef[] = [
  { id: "victory", nameFa: "بردها", nameEn: "Victories", icon: "🏆" },
  { id: "kot", nameFa: "کُت", nameEn: "Kot", icon: "🔥" },
  { id: "streak", nameFa: "نوار پیروزی", nameEn: "Streaks", icon: "⚡" },
  { id: "hakem", nameFa: "حاکمیت", nameEn: "Rulership", icon: "👑" },
  { id: "level", nameFa: "سطح", nameEn: "Levels", icon: "⭐" },
  { id: "rank", nameFa: "رتبه", nameEn: "Ranks", icon: "🏅" },
  { id: "veteran", nameFa: "کارنامه", nameEn: "Veterancy", icon: "🎮" },
];

const FA_DIGITS = "۰۱۲۳۴۵۶۷۸۹";
/** Western → Persian digits, for generated achievement names. */
export function faNum(n: number): string {
  return String(n).replace(/\d/g, (d) => FA_DIGITS[+d]);
}

/** Build a tiered family of achievements for one metric (keeps the list DRY). */
function tier(
  category: AchievementCategoryId,
  metric: AchievementMetric,
  prefix: string,
  icon: string,
  goals: number[],
  faName: (g: string) => string,
  enName: (g: number) => string,
  faDesc: (g: string) => string,
  enDesc: (g: number) => string
): AchievementDef[] {
  return goals.map((g) => ({
    id: `${prefix}_${g}`,
    category,
    metric,
    goal: g,
    coinReward: Math.min(1500, Math.max(50, Math.round((40 + g * 6) / 50) * 50)),
    icon,
    nameFa: faName(faNum(g)),
    nameEn: enName(g),
    descFa: faDesc(faNum(g)),
    descEn: enDesc(g),
  }));
}

export const ACHIEVEMENTS: AchievementDef[] = [
  ...tier("victory", "wins", "wins", "🏆",
    [1, 5, 10, 25, 50, 75, 100, 150, 200, 250, 300, 400, 500, 750, 1000, 2000],
    (g) => `${g} برد`, (g) => `${g} Wins`, (g) => `${g} بازی ببرید`, (g) => `Win ${g} games`),
  ...tier("victory", "shutoutWins", "shutout", "🧹", [1, 3, 5, 10, 25, 50, 100],
    (g) => `${g} بار هفت–هیچ`, (g) => `${g}× Sweep`,
    (g) => `${g} بار حریف را ۷–۰ ببرید`, (g) => `Sweep the opponent ${g}×`),
  ...tier("kot", "kotsFor", "kot", "🔥", [1, 3, 5, 10, 25, 50, 75, 100, 150, 200, 300, 500],
    (g) => `${g} کُت`, (g) => `${g} Kots`, (g) => `${g} بار حریف را کُت کنید`, (g) => `Inflict ${g} Kots`),
  ...tier("streak", "bestWinStreak", "streak", "⚡", [2, 3, 5, 7, 10, 15, 20, 25, 30, 40],
    (g) => `${g} برد پیاپی`, (g) => `${g} Win Streak`,
    (g) => `${g} بازی پشت سر هم ببرید`, (g) => `Win ${g} games in a row`),
  ...tier("hakem", "hakemRounds", "hakem", "👑", [7, 25, 50, 100, 250, 500, 1000],
    (g) => `${g} بار حاکم`, (g) => `Hakem ${g}×`,
    (g) => `${g} دست حاکم شوید`, (g) => `Be the hakem in ${g} rounds`),
  ...tier("level", "level", "level", "⭐",
    [5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100],
    (g) => `سطح ${g}`, (g) => `Level ${g}`, (g) => `به سطح ${g} برسید`, (g) => `Reach level ${g}`),
  ...tier("veteran", "games", "games", "🎮", [10, 25, 50, 100, 200, 300, 500, 750, 1000, 2000, 5000],
    (g) => `${g} بازی`, (g) => `${g} Games`, (g) => `${g} بازی انجام دهید`, (g) => `Play ${g} games`),
  ...tier("veteran", "roundsWon", "rounds", "🎴", [25, 100, 250, 500, 1000, 2000, 5000],
    (g) => `${g} دست برده`, (g) => `${g} Rounds Won`, (g) => `${g} دست ببرید`, (g) => `Win ${g} rounds`),
  ...tier("veteran", "tricks", "tricks", "🗂️", [50, 100, 250, 500, 1000, 2500, 5000, 10000],
    (g) => `${g} دست‌برد`, (g) => `${g} Tricks`, (g) => `${g} دست‌برد بگیرید`, (g) => `Win ${g} tricks`),
  ...tier("veteran", "losses", "grit", "🛡️", [10, 50, 100],
    (g) => `${g} باخت`, (g) => `${g} Losses`,
    (g) => `با وجود ${g} باخت ادامه دهید`, (g) => `Persevere through ${g} losses`),
  // ranks (explicit rating floors)
  { id: "reach_silver", category: "rank", ratingFloor: 1100, goal: 1, coinReward: 150, icon: "🥈", nameFa: "رتبهٔ نقره", nameEn: "Reach Silver", descFa: "به رتبهٔ نقره برسید", descEn: "Reach the Silver rank" },
  { id: "reach_gold", category: "rank", ratingFloor: 1300, goal: 1, coinReward: 300, icon: "🥇", nameFa: "رتبهٔ طلا", nameEn: "Reach Gold", descFa: "به رتبهٔ طلا برسید", descEn: "Reach the Gold rank" },
  { id: "reach_platinum", category: "rank", ratingFloor: 1500, goal: 1, coinReward: 500, icon: "🛡️", nameFa: "رتبهٔ پلاتین", nameEn: "Reach Platinum", descFa: "به رتبهٔ پلاتین برسید", descEn: "Reach the Platinum rank" },
  { id: "reach_diamond", category: "rank", ratingFloor: 1700, goal: 1, coinReward: 900, icon: "💠", nameFa: "رتبهٔ الماس", nameEn: "Reach Diamond", descFa: "به رتبهٔ الماس برسید", descEn: "Reach the Diamond rank" },
  { id: "reach_master", category: "rank", ratingFloor: 1900, goal: 1, coinReward: 1500, icon: "👑", nameFa: "رتبهٔ استاد", nameEn: "Reach Master", descFa: "به رتبهٔ استاد برسید", descEn: "Reach the Master rank" },
];

function metricValue(metric: NonNullable<AchievementDef["metric"]>, stats: PlayerStats, level: number): number {
  switch (metric) {
    case "wins": return stats.wins;
    case "losses": return stats.losses;
    case "kotsFor": return stats.kotsFor;
    case "bestWinStreak": return stats.bestWinStreak;
    case "shutoutWins": return stats.shutoutWins ?? 0;
    case "games": return stats.games;
    case "tricks": return stats.tricks;
    case "hakemRounds": return stats.hakemRounds ?? 0;
    case "roundsWon": return stats.roundsWon ?? 0;
    case "level": return level;
  }
}

/** Current raw progress value (0..goal) for an achievement. */
export function achievementProgress(
  def: AchievementDef,
  stats: PlayerStats,
  rating: number,
  level: number
): number {
  if (def.ratingFloor != null) return rating >= def.ratingFloor ? def.goal : 0;
  if (!def.metric) return 0;
  return Math.min(def.goal, metricValue(def.metric, stats, level));
}

export function achievementById(id: string): AchievementDef | undefined {
  return ACHIEVEMENTS.find((a) => a.id === id);
}

/**
 * Re-evaluate all achievements against the profile's current state (used outside
 * matches, e.g. after an XP-pack purchase crosses a level milestone). Unlocks new
 * ones, grants their coin rewards, and returns the newly-unlocked list.
 */
export function evaluateAchievements(profile: UserProfile): {
  profile: UserProfile;
  newAchievements: AchievementUnlock[];
} {
  const achievements = { ...profile.achievements };
  const unlocked = [...profile.unlocked];
  const newAchievements: AchievementUnlock[] = [];
  let coins = 0;
  for (const def of ACHIEVEMENTS) {
    const prog = achievementProgress(def, profile.stats, profile.rating, profile.level);
    achievements[def.id] = prog;
    if (prog >= def.goal && !unlocked.includes(def.id)) {
      unlocked.push(def.id);
      coins += def.coinReward;
      newAchievements.push({
        id: def.id,
        nameFa: def.nameFa,
        nameEn: def.nameEn,
        icon: def.icon,
        coinReward: def.coinReward,
      });
    }
  }
  return {
    profile: { ...profile, achievements, unlocked, coins: profile.coins + coins },
    newAchievements,
  };
}

/** The sticker pack (if any) that this achievement unlocks for purchase. */
export function stickerPackForAchievement(achId: string): StickerPackDef | undefined {
  return STICKER_PACKS.find((p) => p.reqAchievement === achId);
}

/* ------------------------------ Titles ------------------------------- */

export const TITLES: TitleDef[] = [
  { id: "novice", nameFa: "تازه‌کار", nameEn: "Novice", hintFa: "پیش‌فرض", hintEn: "Default" },
  { id: "winner", nameFa: "برنده", nameEn: "Winner", hintFa: "۱۰ برد", hintEn: "10 wins" },
  { id: "expert", nameFa: "خبره", nameEn: "Expert", hintFa: "سطح ۲۵", hintEn: "Level 25" },
  { id: "kot_master", nameFa: "استاد کُت", nameEn: "Kot Master", hintFa: "۲۵ کُت", hintEn: "25 kots" },
  { id: "professional", nameFa: "حرفه‌ای", nameEn: "Professional", hintFa: "۵۰ برد", hintEn: "50 wins" },
  { id: "veteran", nameFa: "کهنه‌کار", nameEn: "Veteran", hintFa: "سطح ۳۰", hintEn: "Level 30" },
  { id: "captain", nameFa: "کاپیتان", nameEn: "Captain", hintFa: "۱۰۰ برد", hintEn: "100 wins" },
  { id: "marksman", nameFa: "کماندار", nameEn: "Marksman", hintFa: "۵۰ کُت", hintEn: "50 kots" },
  { id: "untouchable", nameFa: "شکست‌ناپذیر", nameEn: "Untouchable", hintFa: "۱۰ برد پیاپی", hintEn: "10 win streak" },
  { id: "sweeper", nameFa: "جاروکش", nameEn: "Sweeper", hintFa: "۱۰ هفت–هیچ", hintEn: "10 sweeps" },
  { id: "ruler", nameFa: "فرمانروا", nameEn: "Ruler", hintFa: "۵۰ بار حاکم", hintEn: "50× hakem" },
  { id: "champion", nameFa: "قهرمان", nameEn: "Champion", hintFa: "لیگ طلا", hintEn: "Gold league" },
  { id: "platinum_star", nameFa: "ستاره پلاتین", nameEn: "Platinum Star", hintFa: "لیگ پلاتین", hintEn: "Platinum league" },
  { id: "leader", nameFa: "فرمانده", nameEn: "Leader", hintFa: "۲۵۰ برد", hintEn: "250 wins" },
  { id: "diamond_ace", nameFa: "آس الماس", nameEn: "Diamond Ace", hintFa: "لیگ الماس", hintEn: "Diamond league" },
  { id: "immortal", nameFa: "جاودانه", nameEn: "Immortal", hintFa: "سطح ۵۰", hintEn: "Level 50" },
  { id: "the_one", nameFa: "یگانه", nameEn: "The One", hintFa: "۵۰۰ برد", hintEn: "500 wins" },
  { id: "legend", nameFa: "اسطوره", nameEn: "Legend", hintFa: "لیگ استاد", hintEn: "Master league" },
  // ✨ Luxury titles — the most prestigious badges in the game
  { id: "sultan", nameFa: "سلطان حکم", nameEn: "Hokm Sultan", hintFa: "۱۰۰ کُت", hintEn: "100 kots" },
  { id: "emperor", nameFa: "امپراتور", nameEn: "Emperor", hintFa: "سطح ۷۵", hintEn: "Level 75" },
  { id: "grandmaster", nameFa: "استاد بزرگ", nameEn: "Grandmaster", hintFa: "امتیاز ۲۱۰۰+", hintEn: "2100+ rating" },
  // 💰 Purchasable titles — buy with coins (shown in the shop's Titles section)
  { id: "vip", nameFa: "وی‌آی‌پی", nameEn: "VIP", hintFa: "خرید", hintEn: "Purchase", price: 2500 },
  { id: "maestro", nameFa: "اوستا", nameEn: "Maestro", hintFa: "خرید", hintEn: "Purchase", price: 2000 },
  { id: "prince", nameFa: "شاهزاده", nameEn: "Prince", hintFa: "خرید", hintEn: "Purchase", price: 3500 },
  { id: "mythic", nameFa: "افسانه‌ای", nameEn: "Mythic", hintFa: "خرید", hintEn: "Purchase", price: 6000 },
];

export function titleById(id: string | null | undefined): TitleDef | undefined {
  if (!id) return undefined;
  return TITLES.find((t) => t.id === id);
}

export function titleUnlocked(
  id: string,
  stats: PlayerStats,
  rating: number,
  level: number
): boolean {
  switch (id) {
    case "novice":
      return true;
    case "winner":
      return stats.wins >= 10;
    case "expert":
      return level >= 25;
    case "kot_master":
      return stats.kotsFor >= 25;
    case "professional":
      return stats.wins >= 50;
    case "veteran":
      return level >= 30;
    case "captain":
      return stats.wins >= 100;
    case "marksman":
      return stats.kotsFor >= 50;
    case "untouchable":
      return stats.bestWinStreak >= 10;
    case "sweeper":
      return (stats.shutoutWins ?? 0) >= 10;
    case "ruler":
      return (stats.hakemRounds ?? 0) >= 50;
    case "champion":
      return rating >= tierById("gold").floor;
    case "platinum_star":
      return rating >= tierById("platinum").floor;
    case "leader":
      return stats.wins >= 250;
    case "diamond_ace":
      return rating >= tierById("diamond").floor;
    case "immortal":
      return level >= 50;
    case "the_one":
      return stats.wins >= 500;
    case "legend":
      return rating >= tierById("master").floor;
    case "sultan":
      return stats.kotsFor >= 100;
    case "emperor":
      return level >= 75;
    case "grandmaster":
      return rating >= 2100;
    default:
      return false;
  }
}

/* ---------------------------- Card styles ---------------------------- */

// Card BACKS (pattern on the reverse of every card).
export const CARD_BACKS: CardBackDef[] = [
  { id: "classic", nameFa: "کلاسیک", nameEn: "Classic", c1: "#14274f", c2: "#0a142e", accent: "#d4af37", price: 0, default: true, pattern: "stripes" },
  { id: "midnight", nameFa: "نیمه‌شب", nameEn: "Midnight", c1: "#1b2540", c2: "#0a0f1f", accent: "#8aa0c8", price: 1200, pattern: "grid" },
  { id: "sapphire", nameFa: "یاقوت کبود", nameEn: "Sapphire", c1: "#0b3a82", c2: "#06173a", accent: "#6aa6ff", price: 800, pattern: "dots" },
  { id: "emerald", nameFa: "زمرد", nameEn: "Emerald", c1: "#0d6b5e", c2: "#062420", accent: "#2dd4bf", price: 1000, pattern: "argyle" },
  { id: "jade", nameFa: "یشم", nameEn: "Jade", c1: "#136f63", c2: "#08221e", accent: "#7fe3c0", price: 2000, pattern: "scales" },
  { id: "onyx", nameFa: "اونیکس", nameEn: "Onyx", c1: "#26262b", c2: "#0c0c10", accent: "#b0b0c0", price: 1500, pattern: "crosshatch" },
  // Rank/achievement gated — always buyable with coins once the gate is met.
  { id: "crimson", nameFa: "ارغوانی", nameEn: "Crimson", c1: "#7a1322", c2: "#2a0710", accent: "#ff8a9c", price: 1000, reqAchievement: "wins_25", pattern: "rays" },
  { id: "ruby", nameFa: "یاقوت", nameEn: "Ruby", c1: "#7f1d2e", c2: "#2b0a12", accent: "#ff7a90", price: 1600, reqRating: 1300, pattern: "argyle", motif: "♦" },
  { id: "royal", nameFa: "سلطنتی", nameEn: "Royal", c1: "#4a1d7f", c2: "#1a0a2e", accent: "#c77dff", price: 2000, reqAchievement: "wins_50", pattern: "royal", motif: "♛" },
  { id: "aurora", nameFa: "شفق", nameEn: "Aurora", c1: "#1d4e6e", c2: "#0a2230", accent: "#5be0c8", price: 2200, reqRating: 1500, pattern: "rays" },
  { id: "obsidian", nameFa: "ابسیدین", nameEn: "Obsidian", c1: "#101018", c2: "#000005", accent: "#7c5cff", price: 2600, reqRating: 1700, pattern: "crosshatch", motif: "✦" },
  { id: "imperial", nameFa: "شاهنشاهی", nameEn: "Imperial", c1: "#5a3c0a", c2: "#241704", accent: "#ffd76a", price: 3200, reqRating: 1900, reqAchievement: "hakem_7", pattern: "royal", motif: "♔" },
  // ✨ Luxury card backs — premium purchasable, each a distinct fancy motif
  { id: "diamond", nameFa: "الماس", nameEn: "Diamond", c1: "#1a3a55", c2: "#0a1a2e", accent: "#9fe6ff", price: 2800, pattern: "gem", motif: "◆" },
  { id: "blackgold", nameFa: "طلای سیاه", nameEn: "Black Gold", c1: "#1a1407", c2: "#000000", accent: "#ffd76a", price: 3500, pattern: "filigree", motif: "♠" },
  { id: "platinum-back", nameFa: "پلاتین", nameEn: "Platinum", c1: "#3a3f4a", c2: "#15171c", accent: "#e6ebf2", price: 4200, pattern: "royal", motif: "✦" },
  { id: "peacock-back", nameFa: "طاووس", nameEn: "Peacock", c1: "#0a3a52", c2: "#06202e", accent: "#16d3c0", price: 3000, pattern: "scales", motif: "❖" },
  { id: "rosegold-back", nameFa: "رزگلد", nameEn: "Rose Gold", c1: "#5a2438", c2: "#2a0e1c", accent: "#ffb0c4", price: 3200, pattern: "argyle", motif: "♥" },
];

// Card FRONTS (the face background/border behind the suit + rank).
export const CARD_FRONTS: CardFrontDef[] = [
  { id: "classic", nameFa: "کلاسیک", nameEn: "Classic", bg1: "#fffdf7", bg2: "#f3ead2", border: "rgba(0,0,0,0.12)", price: 0, default: true },
  { id: "ivory", nameFa: "عاج", nameEn: "Ivory", bg1: "#ffffff", bg2: "#eef2f8", border: "#c9ccd6", price: 600 },
  { id: "sunset", nameFa: "غروب", nameEn: "Sunset", bg1: "#fff3e6", bg2: "#ffd9b0", border: "#e0915a", price: 1000 },
  { id: "rosegold", nameFa: "رزگلد", nameEn: "Rose Gold", bg1: "#fff1ee", bg2: "#f6d9cf", border: "#d98a72", price: 900 },
  { id: "velvet", nameFa: "مخمل", nameEn: "Velvet", bg1: "#f4ecff", bg2: "#dcc9f5", border: "#9a6fd0", price: 1800 },
  { id: "onyx-face", nameFa: "شب‌رنگ", nameEn: "Onyx", bg1: "#2a2a31", bg2: "#16161c", border: "#5a5a6a", price: 1200 },
  // Rank/achievement gated — always buyable with coins once the gate is met.
  { id: "parchment", nameFa: "پوست‌نوشت", nameEn: "Parchment", bg1: "#fbf2d8", bg2: "#efd9a3", border: "#caa84a", price: 1400, reqRating: 1300 },
  { id: "mint", nameFa: "نعنایی", nameEn: "Mint", bg1: "#f0fff8", bg2: "#d3f3e3", border: "#57c79a", price: 1600, reqAchievement: "wins_50" },
  { id: "goldleaf", nameFa: "زرورق", nameEn: "Gold Leaf", bg1: "#fff7df", bg2: "#f2dd9b", border: "#caa53a", price: 2000, reqRating: 1500 },
  { id: "crystal", nameFa: "بلور", nameEn: "Crystal", bg1: "#eefcff", bg2: "#cdeefa", border: "#5fb6d6", price: 2400, reqRating: 1700 },
  { id: "imperial-face", nameFa: "شاهانه", nameEn: "Imperial", bg1: "#fff4cf", bg2: "#ecc873", border: "#b8862a", price: 2800, reqAchievement: "wins_100" },
  // ✨ Luxury card fronts — premium purchasable
  { id: "diamond-face", nameFa: "الماس", nameEn: "Diamond", bg1: "#f4fdff", bg2: "#d7f0fb", border: "#7fc6e6", price: 2500 },
  { id: "blackgold-face", nameFa: "طلای سیاه", nameEn: "Black Gold", bg1: "#2a2410", bg2: "#14110a", border: "#caa53a", price: 3200 },
];

/* ------------------- Gated gift catalogue (titles + backs) -------------------
 * Purchasable gifts that are LOCKED until a level/rating gate is met (the tier is
 * encoded in the id `-t<n>-` so the server enforces it generically). Gift avatars
 * live in types.ts (same scheme). ~100 new gifts total across the three kinds. */
function giftReq(tier: number) {
  const t = GIFT_TIERS[tier] ?? GIFT_TIERS[1];
  return { price: t.price, reqLevel: t.level || undefined, reqRating: t.rating || undefined };
}

// 35 gift titles (fa, en), spread across the 5 tiers.
const GIFT_TITLE_WORDS: [string, string][] = [
  ["سردار", "Commander"], ["یل", "Brave"], ["پهلوان", "Hero"], ["شیردل", "Lionheart"], ["تیزهوش", "Sharp"], ["زبده", "Ace"], ["کارکشته", "Veteran"],
  ["نخبه", "Elite"], ["بی‌رقیب", "Unrivaled"], ["شکست‌ناپذیر", "Invincible"], ["آتشین", "Fiery"], ["طوفان", "Storm"], ["صاعقه", "Thunder"], ["کولاک", "Blizzard"],
  ["تاجدار", "Crowned"], ["فرمانروا", "Ruler"], ["شاهباز", "Royal Falcon"], ["گرگ تنها", "Lone Wolf"], ["عقاب", "Eagle"], ["ققنوس", "Phoenix"], ["محاسب", "Tactician"],
  ["نقشه‌کش", "Strategist"], ["بازی‌ساز", "Playmaker"], ["پادشاه میز", "Table King"], ["حکم‌ران", "Hokm Lord"], ["برگ‌برنده", "Trump Card"], ["دست‌مریزاد", "Masterstroke"], ["افسانه‌ساز", "Legend-Maker"],
  ["جواهر", "Gem"], ["الماس", "Diamond"], ["زرین", "Golden"], ["شاهنشاه", "Emperor"], ["اسطوره زنده", "Living Legend"], ["استاد اعظم", "Grandmaster"], ["تسخیرناپذیر", "Untamed"],
];
TITLES.push(
  ...GIFT_TITLE_WORDS.map(([fa, en], i) => {
    const tier = Math.min(5, Math.floor(i / 7) + 1);
    const r = giftReq(tier);
    return { id: `t-g-t${tier}-${i + 1}`, nameFa: fa, nameEn: en, hintFa: "گیفت ویژه", hintEn: "Special gift", price: r.price, reqLevel: r.reqLevel, reqRating: r.reqRating };
  })
);

// 20 gift card backs (palette × pattern), spread across the 5 tiers.
const GIFT_BACK_PALETTE: { fa: string; en: string; c1: string; c2: string; accent: string; pattern: CardBackDef["pattern"]; motif?: string }[] = [
  { fa: "نیلی", en: "Indigo", c1: "#2b2f7a", c2: "#10112e", accent: "#8aa0ff", pattern: "stripes" },
  { fa: "زمردین", en: "Verdant", c1: "#0d5a44", c2: "#06231a", accent: "#4fe0a8", pattern: "dots" },
  { fa: "غروب", en: "Sunset", c1: "#7a3b12", c2: "#2a1407", accent: "#ffb066", pattern: "rays" },
  { fa: "بنفشه", en: "Violet", c1: "#532a7a", c2: "#1d0e2e", accent: "#c79cff", pattern: "argyle", motif: "✦" },
  { fa: "فیروزه", en: "Turquoise", c1: "#0e5d6e", c2: "#06232a", accent: "#5fe0e0", pattern: "scales" },
  { fa: "گلگون", en: "Rose", c1: "#7a2340", c2: "#2a0c16", accent: "#ff8ab0", pattern: "grid" },
  { fa: "شنی", en: "Sand", c1: "#7a5a1a", c2: "#2a1e08", accent: "#e6c66a", pattern: "crosshatch" },
  { fa: "یخی", en: "Frost", c1: "#3a5a7a", c2: "#13202e", accent: "#9fd0ff", pattern: "dots" },
  { fa: "ارغوان", en: "Magenta", c1: "#7a1f5a", c2: "#2a0a1e", accent: "#ff8ae0", pattern: "rays" },
  { fa: "جنگلی", en: "Forest", c1: "#2e5a1a", c2: "#0e2008", accent: "#9ee06a", pattern: "stripes" },
  { fa: "نقره‌ای", en: "Silver", c1: "#4a4f5a", c2: "#16181d", accent: "#cfd6e6", pattern: "argyle", motif: "♢" },
  { fa: "مسی", en: "Copper", c1: "#7a3f1a", c2: "#2a1508", accent: "#e6975a", pattern: "scales" },
  { fa: "یاقوتی", en: "Garnet", c1: "#6a1326", c2: "#240710", accent: "#ff7a90", pattern: "filigree", motif: "♦" },
  { fa: "کبریتی", en: "Sulfur", c1: "#6a6010", c2: "#242008", accent: "#ffe46a", pattern: "grid" },
  { fa: "اطلسی", en: "Petunia", c1: "#3a2a7a", c2: "#12102e", accent: "#9a8aff", pattern: "royal", motif: "♛" },
  { fa: "زمستانی", en: "Winter", c1: "#1f4a6a", c2: "#0a1a26", accent: "#7fc6ff", pattern: "filigree", motif: "❄" },
  { fa: "آتشفشان", en: "Volcano", c1: "#6a1f10", c2: "#240a06", accent: "#ff7a4a", pattern: "rays", motif: "✦" },
  { fa: "کهکشان", en: "Galaxy", c1: "#241a4a", c2: "#0a0820", accent: "#a98aff", pattern: "gem", motif: "✧" },
  { fa: "زرافشان", en: "Goldspark", c1: "#5a4410", c2: "#241a06", accent: "#ffd76a", pattern: "royal", motif: "♔" },
  { fa: "الماسی", en: "Brilliant", c1: "#103a4a", c2: "#06181f", accent: "#7fe6ff", pattern: "gem", motif: "♦" },
];
CARD_BACKS.push(
  ...GIFT_BACK_PALETTE.map((b, i) => {
    const tier = Math.min(5, Math.floor(i / 4) + 1);
    const r = giftReq(tier);
    return { id: `cb-g-t${tier}-${i + 1}`, nameFa: b.fa, nameEn: b.en, c1: b.c1, c2: b.c2, accent: b.accent, pattern: b.pattern, motif: b.motif, price: r.price, reqLevel: r.reqLevel, reqRating: r.reqRating };
  })
);

export function cardBackById(id: string): CardBackDef {
  return CARD_BACKS.find((c) => c.id === id) ?? CARD_BACKS[0];
}
export function cardFrontById(id: string): CardFrontDef {
  return CARD_FRONTS.find((c) => c.id === id) ?? CARD_FRONTS[0];
}

// Ownership = default items + what the player has bought. Everything else must be
// purchased with coins (req* gates the purchase, it never auto-grants).
function ownedCosmeticIds(
  defs: { id: string; default?: boolean }[],
  _profile: UserProfile,
  purchased: string[]
): string[] {
  const ids = new Set<string>();
  for (const d of defs) {
    if (d.default || purchased.includes(d.id)) ids.add(d.id);
  }
  return [...ids];
}

export function ownedCardBackIds(profile: UserProfile): string[] {
  return ownedCosmeticIds(CARD_BACKS, profile, profile.ownedCardBacks ?? []);
}

/** Avatars the player owns (default + purchased). */
export function ownedAvatarIds(profile: UserProfile): string[] {
  const purchased = profile.ownedAvatars ?? [];
  const ids = new Set<string>();
  for (const a of AVATARS) {
    if (a.default || purchased.includes(a.id)) ids.add(a.id);
  }
  return [...ids];
}
export function ownedCardFrontIds(profile: UserProfile): string[] {
  return ownedCosmeticIds(CARD_FRONTS, profile, profile.ownedCardFronts ?? []);
}

/* --------------------- Reactions (Sheklak / شکلک) -------------------- */

export const REACTION_PACKS: ReactionPackDef[] = [
  { id: "starter", nameFa: "پایه", nameEn: "Starter", reactions: ["👍", "👏", "😂", "😮"], price: 0, default: true },
  { id: "emotions", nameFa: "احساسات", nameEn: "Emotions", reactions: ["😎", "😭", "🤯", "🥳", "😍"], price: 600 },
  { id: "taunt", nameFa: "طعنه", nameEn: "Taunts", reactions: ["😏", "🤡", "🙄", "😴", "🥱"], price: 900 },
  { id: "champion", nameFa: "قهرمان", nameEn: "Champion", reactions: ["👑", "🏆", "💪", "🔥"], price: 1200, reqRating: 1300 },
  { id: "legend", nameFa: "اسطوره", nameEn: "Legend", reactions: ["💎", "⚡", "🐐", "🎯"], price: 1800, reqAchievement: "wins_100" },
];

export function reactionPackById(id: string): ReactionPackDef | undefined {
  return REACTION_PACKS.find((p) => p.id === id);
}

/** Which packs the player currently owns (default + purchased). */
export function ownedReactionPackIds(profile: UserProfile): string[] {
  const purchased = profile.ownedReactionPacks ?? [];
  const ids = new Set<string>();
  for (const p of REACTION_PACKS) {
    if (p.default || purchased.includes(p.id)) ids.add(p.id);
  }
  return [...ids];
}

/** Flattened emoji list the player can send. */
export function ownedReactions(profile: UserProfile): string[] {
  const ids = new Set(ownedReactionPackIds(profile));
  return REACTION_PACKS.filter((p) => ids.has(p.id)).flatMap((p) => p.reactions);
}

/* ------------------------- Sticker packs ----------------------------- */

export const STICKER_PACKS: StickerPackDef[] = [
  { id: "faces", nameFa: "شکلک‌ها", nameEn: "Faces", stickers: ["happy", "sad", "cool", "love", "angry"], price: 0, default: true },
  // Achievement-gated — buyable with coins once the "Seven–Zip" (7–0 sweep) is unlocked.
  { id: "hokm", nameFa: "حکم", nameEn: "Hokm", stickers: ["hokm-badge", "kot-stamp", "crown", "ace-spade"], price: 1200, reqAchievement: "shutout_1" },
  // Achievement-gated — "100 Wins".
  { id: "persian", nameFa: "ایرانی", nameEn: "Persian", stickers: ["chai", "afarin", "rose"], price: 700, reqAchievement: "wins_100" },
  // Achievement-gated — "25 Kots".
  { id: "taunt", nameFa: "طعنه", nameEn: "Taunts", stickers: ["clown", "sleep", "weak"], price: 900, reqAchievement: "kot_25" },
  // Persian-text stamps (کوت! / دمت گرم / باریکلا / آخه؟) — purchasable.
  { id: "persian-text", nameFa: "متن فارسی", nameEn: "Persian Text", stickers: ["kot-text", "damet-garm", "barikalla", "akhe"], price: 1100 },
  // Achievement-gated premium packs (coin + achievement).
  { id: "rulership", nameFa: "حاکمیت", nameEn: "Rulership", stickers: ["crown-gold", "seven-zip"], price: 1500, reqAchievement: "hakem_7" },
  { id: "firestorm", nameFa: "آتشین", nameEn: "Firestorm", stickers: ["streak-fire"], price: 1500, reqAchievement: "streak_10" },

  /* ---- New themed packs: کل‌کل (banter), Persian trends, Hokm/game ---- */
  // کل‌کل / تیکه — trash-talk you fling at the table
  { id: "kolkol", nameFa: "کل‌کل", nameEn: "Banter", stickers: ["sukhti", "yad-begir", "nobate-man", "naz-nakon"], price: 800 },
  { id: "tikeh", nameFa: "تیکه‌انداز", nameEn: "Taunts", stickers: ["kojai", "hool-nasho", "didi-goftam", "bendaz-dige"], price: 1000 },
  { id: "shakkak", nameFa: "شاکی", nameEn: "Salty", stickers: ["nakon-eddea", "shans-avordi", "biya-bebin", "kart-nadari"], price: 1000 },
  // Persian trend phrases / praise
  { id: "trends", nameFa: "ترندها", nameEn: "Trends", stickers: ["eyval", "torkundi", "gol-kashti", "harf-nadari"], price: 900 },
  { id: "tashvigh", nameFa: "تشویق", nameEn: "Cheers", stickers: ["damet-garm-2", "nush-jan", "be-be", "ghorbunet"], price: 700 },
  // Hokm / card-game themed
  { id: "khanevadeh", nameFa: "خانواده خال", nameEn: "Court Cards", stickers: ["tak-khal", "as-del", "shah-khesht", "bibi-gesht"], price: 1200 },
  { id: "victory", nameFa: "پیروزی", nameEn: "Victory", stickers: ["bardim", "hokm-text", "jam-kon", "kish-mat"], price: 1800, reqRating: 1500 },
  // Extra emotions
  { id: "ehsasat", nameFa: "احساسات", nameEn: "Moods", stickers: ["laugh", "shocked", "cry", "smug"], price: 600 },
  // Spicy rival banter — coin + achievement gated.
  { id: "raghib", nameFa: "رقیب", nameEn: "Rivalry", stickers: ["khdahafez", "weak", "clown", "sleep"], price: 1300, reqAchievement: "kot_10" },
];

export function stickerPackById(id: string): StickerPackDef | undefined {
  return STICKER_PACKS.find((p) => p.id === id);
}

export function ownedStickerPackIds(profile: UserProfile): string[] {
  const purchased = profile.ownedStickerPacks ?? [];
  const ids = new Set<string>();
  for (const p of STICKER_PACKS) {
    if (p.default || purchased.includes(p.id)) ids.add(p.id);
  }
  return [...ids];
}

/** Flattened sticker-id list the player can send. */
export function ownedStickers(profile: UserProfile): string[] {
  const ids = new Set(ownedStickerPackIds(profile));
  return STICKER_PACKS.filter((p) => ids.has(p.id)).flatMap((p) => p.stickers);
}

/* ---------------------- Apply a match result ------------------------- */

function applyStats(stats: PlayerStats, summary: MatchSummary): PlayerStats {
  const wins = stats.wins + (summary.won ? 1 : 0);
  const losses = stats.losses + (summary.won ? 0 : 1);
  const currentWinStreak = summary.won ? stats.currentWinStreak + 1 : 0;
  return {
    games: stats.games + 1,
    wins,
    losses,
    kotsFor: stats.kotsFor + (summary.kotFor ? 1 : 0),
    kotsAgainst: stats.kotsAgainst + (summary.kotAgainst ? 1 : 0),
    tricks: stats.tricks + summary.tricksWon,
    currentWinStreak,
    bestWinStreak: Math.max(stats.bestWinStreak, currentWinStreak),
    shutoutWins: (stats.shutoutWins ?? 0) + (summary.won && summary.shutout ? 1 : 0),
    hakemRounds: (stats.hakemRounds ?? 0) + (summary.hakemRounds ?? 0),
    roundsWon: (stats.roundsWon ?? 0) + (summary.roundsWon ?? 0),
  };
}

/**
 * Apply a finished match to a profile. Returns a new profile + a RewardResult
 * describing every delta for the post-match UI.
 */
export function applyMatchResult(
  profile: UserProfile,
  summary: MatchSummary,
  oppRating: number
): { profile: UserProfile; reward: RewardResult } {
  const ratingBefore = profile.rating;
  const coinsBefore = profile.coins;
  const levelBefore = profile.level;

  const rDelta = ratingDelta(summary, profile.rating, oppRating);
  const ratingAfter = Math.max(0, ratingBefore + rDelta);

  const cDelta = coinDelta(summary);
  // Premium (pro) players earn a multiple of XP.
  const xpGain = Math.round(matchXp(summary) * (profile.plan === "pro" ? PREMIUM_XP_MULT : 1));
  const lvl = addXp(profile.level, profile.xp, xpGain);

  const stats = applyStats(profile.stats, summary);

  // Evaluate achievements against the new state.
  const achievements = { ...profile.achievements };
  const unlocked = [...profile.unlocked];
  const newAchievements: AchievementUnlock[] = [];
  let achievementCoins = 0;
  for (const def of ACHIEVEMENTS) {
    const prog = achievementProgress(def, stats, ratingAfter, lvl.level);
    achievements[def.id] = prog;
    if (prog >= def.goal && !unlocked.includes(def.id)) {
      unlocked.push(def.id);
      achievementCoins += def.coinReward;
      newAchievements.push({
        id: def.id,
        nameFa: def.nameFa,
        nameEn: def.nameEn,
        icon: def.icon,
        coinReward: def.coinReward,
      });
    }
  }

  const coinsAfter = Math.max(0, coinsBefore + cDelta + achievementCoins);

  // Titles unlocked by the new state.
  const ownedTitles = [...(profile.ownedTitles ?? [])];
  const newTitles: TitleUnlock[] = [];
  for (const tdef of TITLES) {
    if (
      titleUnlocked(tdef.id, stats, ratingAfter, lvl.level) &&
      !ownedTitles.includes(tdef.id)
    ) {
      ownedTitles.push(tdef.id);
      newTitles.push({ id: tdef.id, nameFa: tdef.nameFa, nameEn: tdef.nameEn });
    }
  }

  const leagueBefore = getLeagueInfo(ratingBefore);
  const leagueAfter = getLeagueInfo(ratingAfter);
  const tierIndex = (id: RankTierId) => RANK_TIERS.findIndex((t) => t.id === id);
  const rankValue = (l: LeagueInfo) =>
    tierIndex(l.tier.id) * 10 - (l.division ?? 0);
  const promoted = rankValue(leagueAfter) > rankValue(leagueBefore);
  const demoted = rankValue(leagueAfter) < rankValue(leagueBefore);

  const newProfile: UserProfile = {
    ...profile,
    rating: ratingAfter,
    coins: coinsAfter,
    level: lvl.level,
    xp: lvl.xp,
    stats,
    achievements,
    unlocked,
    ownedTitles,
  };

  const reward: RewardResult = {
    ratingBefore,
    ratingAfter,
    ratingDelta: ratingAfter - ratingBefore,
    coinsBefore,
    coinsAfter,
    coinsDelta: coinsAfter - coinsBefore,
    xpGained: xpGain,
    levelBefore,
    levelAfter: lvl.level,
    leveledUp: lvl.level > levelBefore,
    newAchievements,
    newTitles,
    promoted,
    demoted,
  };

  return { profile: newProfile, reward };
}

/* --------------------------- Daily reward ---------------------------- */

export const DAILY_REWARDS = [100, 150, 200, 300, 400, 600, 1500];

export function dailyRewardFor(day: number): number {
  return DAILY_REWARDS[Math.min(day, DAILY_REWARDS.length) - 1] ?? 100;
}

/* ----------------------- Profile-completion reward ----------------------- */

/** One-time coin reward for setting your city on the profile. */
export const CITY_REWARD = 500;