/* =========================================================
 * REPRTERRA WEB — entities.js
 * Factories & shared helpers for buildings/units/dinos.
 * ========================================================= */
'use strict';
window.RTS = window.RTS || {};

RTS.entities = (function () {
  const U = RTS.util;
  let nextId = 1;

  const E = {};
  E.resetIds = () => { nextId = 1; };
  // after loading a save, keep new ids above everything deserialized
  E.setIdFloor = (n) => { if (n >= nextId) nextId = n + 1; };

  // ---------- footprint ----------
  // returns [x0,y0] of top-left tile for a building centered at cx,cy
  E.footOrigin = function (cx, cy, size) {
    return [Math.round(cx - size / 2), Math.round(cy - size / 2)];
  };

  // ---------- buildings ----------
  E.makeBuilding = function (defId, cx, cy, opts) {
    const C = RTS.CONFIG;
    const def = C.BUILDINGS[defId];
    const instant = opts && opts.instant;
    const b = {
      kind: 'building',
      id: nextId++,
      defId,
      name: def.name,
      size: def.size,
      x: Math.round(cx), y: Math.round(cy),   // center tile coords
      hp: instant ? def.hp : def.hp * 0.15,
      maxHp: def.hp,
      done: !!instant,
      progress: instant ? 1 : 0,
      buildTime: instant ? 0 : 2.5 + def.size * 2.5,
      workersNeed: def.workers || 0,
      workers: 0,
      powered: true,
      active: true,          // production on/off
      cool: 0,               // tower fire cooldown
      trainQ: [],            // barracks queue [{t, unit}]
      trainT: 0,
      rallyX: null, rallyY: null,
      burnT: 0,
    };
    return b;
  };

  // ---------- human units ----------
  E.makeUnit = function (unitId, x, y) {
    const C = RTS.CONFIG;
    const def = C.UNITS[unitId];
    const simSt = (RTS.sim && RTS.sim.state) ? RTS.sim.state() : null;
    const armorLvl = (simSt && simSt.upgrades) ? simSt.upgrades.armor || 0 : 0;
    const hp = def.hp * (1 + 0.25 * armorLvl);
    return {
      kind: 'unit',
      id: nextId++,
      unitId,
      name: def.name,
      x, y,
      hp, maxHp: hp,
      speed: def.speed,
      cool: 0,
      path: null, pathI: 0,
      tx: null, ty: null,          // move goal
      attackMove: false,
      targetId: 0,                 // focused enemy
      selected: false,
      facing: U.rng() * Math.PI * 2,
      animT: U.rng() * 10,
      dead: false,
    };
  };

  // ---------- dinosaurs ----------
  E.makeDino = function (dinoId, x, y, mode, home) {
    const C = RTS.CONFIG;
    const def = C.DINOS[dinoId];
    const rng = U.rng;
    return {
      kind: 'dino',
      id: nextId++,
      dinoId,
      name: def.name,
      x, y,
      hp: def.hp, maxHp: def.hp,
      dmg: def.dmg,
      rof: def.rof,
      speed: def.speed * rng.range(0.9, 1.12),
      r: def.r,
      flying: !!def.flying,
      amphibious: !!def.amphibious,
      ranged: def.ranged || 0,
      bldMult: def.bldMult || 1,
      bounty: def.bounty,
      scale: def.scale,
      color: def.color,
      mode: mode || 'wave',          // 'roam' | 'wave' | 'final'
      homeX: home ? home.x : x, homeY: home ? home.y : y,
      targetId: 0, targetType: '',
      path: null, pathI: 0,
      repathT: 0,
      stuckT: 0,
      lastDist: Infinity,
      cool: 0,
      facing: rng() * Math.PI * 2,
      animT: rng() * 10,
      wanderT: 0,
      wx: x, wy: y,
      aggro: !!(mode === 'wave'),
      dead: false,
      hitFlash: 0,
    };
  };

  // ---------- projectiles ----------
  E.makeProj = function (type, x, y, tx, ty, opts) {
    return {
      kind: 'proj',
      id: nextId++,
      type,           // 'bullet' | 'shell' | 'spit'
      x, y, z: opts && opts.z != null ? opts.z : 8,
      tx, ty,
      speed: opts && opts.speed || 14,
      dmg: opts && opts.dmg || 5,
      aoe: opts && opts.aoe || 0,
      air: !!(opts && opts.air),
      fromPlayer: !(opts && opts.enemy),
      color: opts && opts.color || '#ffd76a',
      trail: [],
      arc: opts && opts.arc || 0,     // lob height for shells/spits
      t: 0, total: 1,
    };
  };

  return E;
})();