'use strict';

// === ITEM SYSTEM ===

var Save = typeof require !== 'undefined' ? require('../save/save') : {};
var saveData = Save.saveData || window.saveData;
var saveProgress = Save.saveProgress || window.saveProgress;
var addHeartPiece = Save.addHeartPiece || window.addHeartPiece;
var addWeapon = Save.addWeapon || window.addWeapon;

function openChest(chest) {
  chest.opened = true;
  const loot = chest.loot;
  if (!loot) return;

  spawnParticles(chest.x * TILE + TILE / 2, chest.y * TILE + TILE / 2, '#FFD700', 10);

  if (loot.type === 'weapon') {
    const weaponDef = WEAPONS.find(w => w.name === loot.name);
    if (weaponDef && !gameState.player.weapons.find(w => w.name === weaponDef.name)) {
      gameState.player.weapons.push({ ...weaponDef });
      if (!gameState.player.activeWeapon) {
        gameState.player.activeWeapon = gameState.player.weapons[0];
      }
      addWeapon(weaponDef.name);
      showMessage(`Got ${weaponDef.name}!`);
    }
  }

  if (loot.type === 'consumable') {
    const itemDef = ITEMS.find(i => i.name === loot.name);
    if (itemDef) {
      if (itemDef.id === 'potion_small') {
        gameState.player.hp = Math.min(gameState.player.hp + 4, gameState.player.maxHp);
        showMessage('Small Potion! (+4 HP)');
      } else if (itemDef.id === 'potion_medium') {
        gameState.player.hp = Math.min(gameState.player.hp + 8, gameState.player.maxHp);
        showMessage('Medium Potion! (+8 HP)');
      } else if (itemDef.id === 'potion_large') {
        gameState.player.hp = Math.min(gameState.player.hp + 12, gameState.player.maxHp);
        showMessage('Large Potion! (+12 HP)');
      } else if (itemDef.id === 'heart_piece') {
        gameState.player.items.push({ ...itemDef });
        addHeartPiece();
        showMessage(`Heart Piece! (${saveData.heartPieces}/4)`);
      } else if (itemDef.id === 'heart_container') {
        if (gameState.player.maxHp < MAX_HEARTS * 2) {
          gameState.player.maxHp += 2;
          gameState.player.hp = gameState.player.maxHp;
          showMessage('Heart Container! Max HP increased!');
        }
      } else if (itemDef.id === 'arrows') {
        gameState.player.arrows += (loot.count || 10);
        showMessage(`+${loot.count || 10} Arrows!`);
      } else if (itemDef.id === 'bombs') {
        gameState.player.bombs += (loot.count || 10);
        showMessage(`+${loot.count || 10} Bombs!`);
      } else if (itemDef.id === 'key') {
        gameState.player.keys += (loot.count || 1);
        showMessage(`+${loot.count || 1} Key!`);
      } else if (itemDef.id === 'bow') {
        if (!gameState.player.weapons.find(w => w.name === 'Bow')) {
          const bowDef = WEAPONS.find(w => w.name === 'Bow');
          if (bowDef) {
            gameState.player.weapons.push({ ...bowDef });
            addWeapon('Bow');
            showMessage('Got Bow!');
          }
        }
        gameState.player.arrows += (loot.count || 10);
        showMessage(`+${loot.count || 10} Arrows!`);
      } else {
        gameState.player.items.push({ ...itemDef, count: loot.count || 1 });
        showMessage(`Got ${itemDef.name}!`);
      }
    }
  }

  if (loot.type === 'upgrade') {
    if (loot.name === 'sword_upgrade' && gameState.player.activeWeapon) {
      gameState.player.activeWeapon.damage += 1;
      showMessage('Sword upgraded! (+1 damage)');
    }
  }

  saveProgress();
}

function collectFloorItem(item) {
  item.collected = true;
  const itemDef = ITEMS.find(i => i.id === item.id);
  if (!itemDef) return;

  spawnParticles(item.x * TILE + TILE / 2, item.y * TILE + TILE / 2, itemDef.color || '#FFD700', 5);

  if (itemDef.type === 'potion') {
    gameState.player.hp = Math.min(gameState.player.hp + (itemDef.healAmount || 4), gameState.player.maxHp);
    showMessage(`${itemDef.name}! (+${itemDef.healAmount} HP)`);
  } else if (itemDef.id === 'heart_piece') {
    addHeartPiece();
    showMessage(`Heart Piece! (${saveData.heartPieces}/4)`);
  } else if (itemDef.id === 'arrows') {
    gameState.player.arrows += (item.count || 5);
    showMessage(`+${item.count || 5} Arrows!`);
  } else if (itemDef.id === 'bombs') {
    gameState.player.bombs += (item.count || 5);
    showMessage(`+${item.count || 5} Bombs!`);
  } else if (itemDef.id === 'key') {
    gameState.player.keys++;
    showMessage('+1 Key!');
  } else {
    gameState.player.items.push({ ...itemDef });
    showMessage(`Got ${itemDef.name}!`);
  }
}

function useItem(itemIdx) {
  if (!gameState.player.items[itemIdx]) return;
  const item = gameState.player.items[itemIdx];
  const def = ITEMS.find(i => i.id === item.id);
  if (!def || def.type !== 'consumable') return;

  if (def.id.startsWith('potion')) {
    gameState.player.hp = Math.min(gameState.player.hp + (def.healAmount || 4), gameState.player.maxHp);
    showMessage(`Used ${def.name}! (+${def.healAmount} HP)`);
    spawnParticles(gameState.player.x * TILE + TILE / 2, gameState.player.y * TILE + TILE / 2, '#00FF00', 8);
  } else {
    showMessage(`Can't use ${def.name} here`);
    return;
  }

  item.count = (item.count || 1) - 1;
  if (item.count <= 0) {
    gameState.player.items.splice(itemIdx, 1);
  }
}

function switchWeapon() {
  if (gameState.player.weapons.length <= 1) return;
  const currentIdx = gameState.player.weapons.findIndex(w => w === gameState.player.activeWeapon);
  const nextIdx = (currentIdx + 1) % gameState.player.weapons.length;
  gameState.player.activeWeapon = gameState.player.weapons[nextIdx];
  showMessage(`Switched to ${gameState.player.activeWeapon.name}`);
}

if (typeof module !== 'undefined' && module.exports) {
  module.exports = { openChest, collectFloorItem, useItem, switchWeapon };
}