/* ============================================================
 * Diablo2D — entities.js : entity classes & spatial index
 * ============================================================ */
'use strict';
window.D2 = window.D2 || {};
(function (D2) {

  let nextUid = 1;

  /* ---------------- Player ---------------- */
  class Player {
    constructor(classId) {
      this.uid = nextUid++;
      this.kind = 'player';
      this.classId = classId;
      this.x = 0; this.y = 0;
      this.radius = 0.34;
      this.dead = false;

      /* progression */
      this.level = 1;
      this.xp = 0;
      this.gold = 60;
      this.statPoints = 0;
      this.skillPoints = 0;
      this.attributes = { str: 0, dex: 0, vit: 0, ene: 0 }; // allocated points
      this.skills = {};          // skillId -> rank
      this.hotbar = ['basic', null, null, null, null]; // slot0=basic(LMB), 1=RMB, 2..4 keys
      this.potions = { hp: 4, mp: 3 };
      this.inventory = [];       // items
      this.equip = { weapon: null, offhand: null, head: null, chest: null, hands: null, feet: null, amulet: null, ring1: null, ring2: null };

      /* derived (recomputed) */
      this.stats = {};
      this.maxHp = 50; this.hp = 50;
      this.maxMana = 20; this.mana = 20;

      /* movement / anim */
      this.moving = false;
      this.walkPhase = 0;
      this.attackAnim = 0;
      this.hurtFlash = 0;
      this.attackCd = 0;
      this.channel = null;       // whirlwind/dash state
      this.guaranteedCritT = 0;
      this.smokeveilT = 0;

      this.buffs = [];           // {id,name,icon,t,dur,mods}
      this.dots = [];

      /* run meta */
      this.kills = 0;
      this.eliteKills = 0;
      this.bossKills = 0;
      this.deaths = 0;
    }
  }

  /* ---------------- Monster ---------------- */
  class Monster {
    constructor(statBlock, x, y) {
      Object.assign(this, statBlock);
      this.uid = nextUid++;
      this.kind = 'monster';
      this.x = x; this.y = y;
      this.homeX = x; this.homeY = y;
      this.dead = false;
      this.dying = false;

      /* ai state */
      this.state = 'idle';       // idle | chase | windup | recover | charging | fleeing
      this.aggro = false;
      this.stateT = 0;
      this.attackT = 0;          // windup progress
      this.attackAnim = 0;
      this.hurtFlash = 0;
      this.cdT = 0;              // attack cooldown
      this.specialCd = 0;
      this.chargeVX = 0; this.chargeVY = 0;
      this.path = null; this.pathIdx = 0; this.pathT = 0;
      this.moving = false; this.speedFactor = 1;

      /* statuses */
      this.frozen = 0;
      this.chillT = 0; this.chillSlow = 0;
      this.dots = [];
      this.regenAcc = 0;
    }
  }

  /* ---------------- Projectile ---------------- */
  const projectiles = [];
  class Projectile {
    constructor(o) {
      Object.assign(this, {
        x: 0, y: 0, vx: 0, vy: 0,
        speed: 10, dmg: 5, elem: null,
        fromPlayer: true,
        pierce: false,
        maxHits: 1,
        hits: new Set(),
        life: 2.2,
        visual: 'bolt',
        color: '#fff',
        size: 1,
        slow: 0, slowDur: 0,
        bleed: false,
        aoe: 0,
        pool: false,
        freeze: 0,
        knockback: 0,
        guaranteedCrit: false,
        ownerSkillId: null,
        z: 0,
      }, o);
      this.uid = nextUid++;
      this.dead = false;
    }
  }

  /* ---------------- Pickup ---------------- */
  class Pickup {
    constructor(kind, x, y, extra = {}) {
      this.uid = nextUid++;
      this.kind = kind;           // gold | potion | item
      this.x = x; this.y = y;
      this.amount = extra.amount || 0;
      this.item = extra.item || null;
      this.potionType = extra.potionType || null;
      this.t = 0;                 // age (for pop animation)
      this.magnet = false;
    }
  }

  /* ---------------- Spatial hash for monsters ---------------- */
  class Grid {
    constructor(cell = 2.5) { this.cell = cell; this.map = new Map(); }
    key(x, y) { return ((x / this.cell) | 0) + ',' + ((y / this.cell) | 0); }
    rebuild(entities) {
      this.map.clear();
      for (const e of entities) {
        if (e.dead) continue;
        const k = this.key(e.x, e.y);
        let arr = this.map.get(k);
        if (!arr) { arr = []; this.map.set(k, arr); }
        arr.push(e);
      }
    }
    query(x, y, r, out = []) {
      out.length = 0;
      const c = this.cell;
      const x0 = ((x - r) / c) | 0, x1 = ((x + r) / c) | 0;
      const y0 = ((y - r) / c) | 0, y1 = ((y + r) / c) | 0;
      for (let gy = y0; gy <= y1; gy++) {
        for (let gx = x0; gx <= x1; gx++) {
          const arr = this.map.get(gx + ',' + gy);
          if (arr) for (const e of arr) {
            const dx = e.x - x, dy = e.y - y;
            if (dx * dx + dy * dy <= r * r) out.push(e);
          }
        }
      }
      return out;
    }
    nearest(x, y, maxR, filter) {
      let best = null, bd = maxR * maxR;
      const cand = this.query(x, y, maxR, []);
      for (const e of cand) {
        if (filter && !filter(e)) continue;
        const d = (e.x - x) ** 2 + (e.y - y) ** 2;
        if (d < bd) { bd = d; best = e; }
      }
      return best;
    }
  }

  D2.entities = { Player, Monster, Projectile, Pickup, Grid };
})(window.D2);