// ═══ state.js ═══
// ============================================================
//  STATE.JS — Central game state, constants, definitions
// ============================================================

// ── ARENA ─────────────────────────────────────────────
const ARENA_RADIUS = 720; // play area radius; enemies always spawn at this distance from tower
const ARENA_CX = 665;    // center x of play area: (1600 - 270) / 2
const ARENA_CY = 482;    // center y of play area: 64 + (900 - 64) / 2

// ── INITIAL GAME STATE ────────────────────────────────────────
function makeGameState() {
  return {
    credits: 150,
    score: 0,
    totalKills: 0,
    frame: 0,
    paused: false,
    gameOver: false,
    isBankrupt: false,
    _isNewBest: false,
    creditReserve: 50,   // minimum credits kept in reserve — cannot spend upgrades below this

    // Camera
    camera: { zoom: 0.85, minZoom: 0.57, maxZoom: 1.8 },

    // Tower
    tower: {
      hp: 20,
      maxHp: 20,
      armor: 0,
      aimSpeed: 0.026,
      range: 250,        // vision + targeting radius; enemies outside are in fog and untargetable
      cannonAngle: 0,
      weaponSlots: 1,
      shield: null,
      shieldHp: 0,
      shieldMaxHp: 0,
      shieldAngle: 0,
      shieldUnlocked: [],
    },

    // Weapons: array of active weapon instances
    weapons: [
      makeWeaponInstance('cannon'),
    ],

    // Upgrade tracking
    towerUpgradesBought: [],   // array of upgrade ids
    weaponUpgradesBought: {},  // { weaponInstanceId: [upgradeIds] }
    shieldUpgradesBought: [],  // upgrade ids for current shield

    // Entities
    enemies: [],
    projectiles: [],
    beams: [],
    chainArcs: [],     // lightning bolt visuals
    aoeZones: [],      // lingering AoE (poison clouds, freeze zones)
    particles: [],
    floaters: [],
    portals: [],

    // Portal system
    portalCooldown: 0,

    // Input state
    selectedEnemyType: null,
    sendQuantity: 1,

    // Overlay panels — armory (weapons) and command (tower upgrades)
    armoryOpen:  false,
    commandOpen: false,
    weaponDetailSlot: -1,

    // Entity id counter
    nextId: 1,

    // Kill streak
    streak: { count: 0, lastKillFrame: -999 },

    // Enemy freshness (novelty bonus) — higher = less fresh = less bonus
    enemyFreshness: Object.fromEntries(ENEMY_DEFS.map(d => [d.id, 0])),

    // Difficulty / Prestige
    difficultyTier: 0,
    unlockedTiers: [0],
    prestigeLevel: 0,
    permanentBonuses: {},

    // Other overlay panels
    threatOpen: false,
    prestigeOpen: false,
  };
}

let G = makeGameState(); // global game state

function countOwnedWeaponType(defId) {
  let count = 0;
  for (let i = 0; i < G.tower.weaponSlots; i++) {
    const w = G.weapons[i];
    if (w && w.defId === defId) count++;
  }
  for (const w of (G.weaponInventory || [])) {
    if (w && w.defId === defId) count++;
  }
  return count;
}

function canBuyWeaponType(defId) {
  return countOwnedWeaponType(defId) < MAX_WEAPONS_PER_TYPE;
}

function makeWeaponInstance(defId) {
  const def = WEAPON_DEFS.find(w => w.id === defId);
  if (!def) return null;
  return {
    instanceId: 'w_' + defId + '_' + Date.now(),
    defId,
    defaultElement: def.defaultElement ?? 'physical',
    // Live stats (modified by upgrades)
    damage: def.damage,
    fireRate: def.fireRate,
    range: def.range ?? 9999,
    projectileSpeed: def.projectileSpeed ?? 6,
    projectileRadius: def.projectileRadius ?? 4,
    coneAngle: def.coneAngle ?? 0,
    chains: def.chains ?? 0,
    chainRange: def.chainRange ?? 0,
    aoeRadius: def.aoeRadius ?? 0,
    freezeDuration: def.freezeDuration ?? 0,
    armorShred: def.armorShred ?? 0,
    targets: def.targets ?? 1,
    amplify: def.amplify ?? 0,
    dotDamage: def.dotDamage ?? 0,
    dotInterval: def.dotInterval ?? 0,
    dotDuration: def.dotDuration ?? 0,
    pierce: 0,
    critChance: 0,
    elements: [],             // no elements by default — must purchase infuse slots
    targeting: def.targeting,
    cooldown: 0,
    aimAngle: -Math.PI / 2,
    recoil: 0,
    muzzleFlash: 0,
    lastFireFrame: -9999,
    canInfuse: false,
    canInfuse2: false,
    canInfuse3: false,
  };
}

function getWeaponDef(instanceOrId) {
  const id = typeof instanceOrId === 'string' ? instanceOrId : instanceOrId.defId;
  return WEAPON_DEFS.find(w => w.id === id);
}

function getWeaponElements(weapon) {
  const base = weapon.defaultElement || getWeaponDef(weapon)?.defaultElement || 'physical';
  const elements = [...new Set([base, ...(weapon.elements || [])].filter(el => el && el !== 'physical'))];
  return elements.length ? elements : ['physical'];
}

function uid() {
  return G.nextId++;
}