/* ============================================================
 * Diablo2D — balance.js : tuning constants & progression curves
 * ============================================================ */
'use strict';
window.D2 = window.D2 || {};
(function (D2) {

  const BAL = {
    /* --- progression --- */
    maxLevel: 40,
    statPointsPerLevel: 5,
    skillPointsPerLevel: 1,
    xpForLevel(l) { return Math.floor(58 * Math.pow(l, 1.72) + 24 * l); },

    /* --- player base --- */
    baseHp: 42, hpPerVit: 3.4, hpPerLevel: 7.5,
    baseMana: 18, manaPerEne: 2.2, manaPerLevel: 3.5,
    baseArmor: 3,
    baseCrit: 0.05, baseCritDmg: 1.5,
    baseSpeed: 3.4,             // tiles / second
    baseAttackCd: 0.62,         // seconds (modified by weapon aps)
    hpRegenPerSec: 0.35, manaRegenPerSec: 1.4,

    /* primary stat -> derived */
    meleeDmgPerStr: 0.011,      // +1.1% weapon dmg / str
    rangedDmgPerDex: 0.011,
    castDmgPerEne: 0.012,
    armorPerStr: 0.25,
    critPerDex: 0.0018,         // +0.18% / dex
    dodgePerDex: 0.0022,

    /* caps */
    resistCap: 0.72,
    armorDrCap: 0.78,
    critCap: 0.75,
    speedCap: 6.2,

    /* --- monsters --- */
    monsterLevel(act, floorIdx, torment) { return 1 + act * 4 + floorIdx + (torment || 0) * 9; },
    mHp(mlvl) { return Math.floor(15 + 9.2 * Math.pow(mlvl, 1.36)); },
    mDmg(mlvl) { return Math.floor(2.4 + 2.1 * Math.pow(mlvl, 1.28)); },
    mXp(mlvl) { return Math.floor(7 + 5.2 * Math.pow(mlvl, 1.35)); },
    mArmor(mlvl) { return Math.floor(2 + 1.6 * mlvl); },

    eliteHpMult: 2.2, eliteDmgMult: 1.38, eliteXpMult: 2.4, eliteSizeMult: 1.22,
    bossHpMult: 7.0, bossDmgMult: 1.55, bossXpMult: 12, bossSizeMult: 1.85,

    /* --- combat --- */
    armorK: 34 + 6.2,           // DR = armor/(armor + K*mlvl) — K applied as armorK*mlvl
    knockback: 0.16,            // tiles
    hitFlashTime: 0.12,
    corpseTime: 14,
    goldDropBase(mlvl) { return Math.floor(3 + 2.6 * mlvl * (0.8 + Math.random() * 0.5)); },

    /* --- drops --- */
    dropChances: {
      gold: 0.42, potionHp: 0.11, potionMp: 0.075, gear: 0.145, gearEliteBonus: 0.35, gearBoss: 1.0,
    },
    rarityWeights: { common: 100, magic: 34, rare: 9.5, legendary: 1.35 },
    magicFindRarityBoost(mf) { return 1 + mf / 100 * 0.85; },  // mf stat in percent points
    potionStackMax: 12,
    potionHealPct: 0.32,
    potionManaPct: 0.38,
    potionHealFlat(mlvl) { return 14 + 6 * mlvl; },

    /* --- economy --- */
    vendorStockSize: [8, 13],
    vendorRerollCostMult: 0.0,
    sellRatio: 0.28,
    buyMarkup: 1.0,
    healerCost(level) { return 12 + level * 6; },
    stashRows: 7,

    /* --- death --- */
    deathGoldPenalty: 0.12,

    /* --- acts --- */
    /* ---- quest chain (Diablo-style: accept from NPCs, hunt, turn in) ---- */
  questKillBase(act) { return 12 + act * 4; },
  gambleCost(level) { return 80 + level * 45; },
  tomeCost(level) { return 120 + level * 60; },
  respecCost(level) { return 300 + level * 90; },
  QUESTS: [
    // Act I
    { id: 'a0_cull',  giver: 'kashya', act: 0, type: 'kills', target: 15,
      title: 'quest.cull', desc: 'quest.cull.desc', reward: { gold: 180, xp: 90 } },
    { id: 'a0_boss',  giver: 'cain',   act: 0, requires: 'a0_cull', type: 'boss',
      title: 'quest.boss', desc: 'quest.boss.desc', reward: { gold: 450, xp: 320, itemLevelBonus: 2 } },
    // Act II
    { id: 'a1_cull',  giver: 'kashya', act: 1, type: 'kills', target: 18,
      title: 'quest.cull', desc: 'quest.cull.desc', reward: { gold: 380, xp: 700 } },
    { id: 'a1_boss',  giver: 'cain',   act: 1, requires: 'a1_cull', type: 'boss',
      title: 'quest.boss', desc: 'quest.boss.desc', reward: { gold: 800, xp: 1500, itemLevelBonus: 3 } },
    // Act III
    { id: 'a2_cull',  giver: 'kashya', act: 2, type: 'kills', target: 22,
      title: 'quest.cull', desc: 'quest.cull.desc', reward: { gold: 900, xp: 4200 } },
    { id: 'a2_boss',  giver: 'cain',   act: 2, requires: 'a2_cull', type: 'boss',
      title: 'quest.boss', desc: 'quest.boss.desc', reward: { gold: 1600, xp: 8000, itemLevelBonus: 4 } },
    // Act IV
    { id: 'a3_cull',  giver: 'kashya', act: 3, type: 'kills', target: 26,
      title: 'quest.cull', desc: 'quest.cull.desc', reward: { gold: 2000, xp: 22000 } },
    { id: 'a3_boss',  giver: 'cain',   act: 3, requires: 'a3_cull', type: 'boss',
      title: 'quest.boss', desc: 'quest.boss.desc', reward: { gold: 3500, xp: 40000, itemLevelBonus: 5 } },
    // Post-victory repeatable hook
    { id: 'torment_1', giver: 'cain', act: 3, requiresVictory: true, type: 'boss', torment: true,
      title: 'quest.torment', desc: 'quest.torment.desc', reward: { gold: 5000, xp: 60000, itemLevelBonus: 6 } },
  ],
  questById(id) { return this.QUESTS.find(q => q.id === id); },

  acts: [
      { name: 'act.names.0', floors: 4, boss: 'butcher', theme: 'cathedral', music: 'crypt' },
      { name: 'act.names.1', floors: 4, boss: 'boneking', theme: 'catacombs', music: 'crypt' },
      { name: 'act.names.2', floors: 4, boss: 'spiderqueen', theme: 'caves', music: 'cave' },
      { name: 'act.names.3', floors: 4, boss: 'terrorlord', theme: 'hell', music: 'hell' },
    ],
    floorsPerAct: 4,   // last floor of each act is the boss lair
    maxTorment: 10,

    /* --- shrine buffs --- */
    shrineDuration: 45,
    shrineBuffPower: { dmg: 0.35, speed: 0.3, armor: 0.5, xp: 0.5, regen: 4 },

    /* --- skills --- */
    skillMaxRank: 5,
    tierUnlockLevels: [1, 4, 8, 13, 19],
    manaCostRank(base) { return Math.round(base * (1 + 0.14 * 4)); }, // computed per rank elsewhere
    cooldownReductionCap: 0.55,

    /* --- misc --- */
    interactRange: 1.35,
    pickupRange: 1.15,
    aggroRange: 7.5,
    deaggroLeash: 14,
    maxProjectiles: 260,
    maxParticles: 700,
    maxFloatingText: 90,
  };

  BAL.armorK = 40; // final constant

  D2.BAL = BAL;
})(window.D2);