'use strict';

// === SAVE SYSTEM ===

const SAVE_KEY = 'zelda_dungeon_save_v1';

let saveData = {
  completedDungeons: [],
  weapons: [],
  heartPieces: 0,
  totalRoomsCleared: 0,
  totalEnemiesDefeated: 0,
  dungeonsBeaten: 0,
  playTime: 0,
};

function loadSaveData() {
  try {
    const raw = localStorage.getItem(SAVE_KEY);
    if (raw) {
      saveData = JSON.parse(raw);
      console.log('Save loaded:', saveData);
    }
  } catch (e) {
    console.warn('Failed to load save:', e);
  }
  // Check for electron API (for Electron builds)
  if (window.electronAPI && window.electronAPI.loadSave) {
    try {
      const electronSave = window.electronAPI.loadSave();
      if (electronSave) saveData = electronSave;
    } catch (e) { /* fallback to localStorage */ }
  }
}

function saveProgress() {
  try {
    localStorage.setItem(SAVE_KEY, JSON.stringify(saveData));
    console.log('Save written:', saveData);
  } catch (e) {
    console.warn('Failed to save:', e);
  }
  if (window.electronAPI && window.electronAPI.saveData) {
    try {
      window.electronAPI.saveData(saveData);
    } catch (e) { /* fallback to localStorage */ }
  }
}

function markDungeonComplete(dungeonIdx) {
  if (!saveData.completedDungeons.includes(dungeonIdx)) {
    saveData.completedDungeons.push(dungeonIdx);
    saveData.dungeonsBeaten++;
  }
}

function addWeapon(name) {
  if (!saveData.weapons.includes(name)) {
    saveData.weapons.push(name);
  }
}

function addHeartPiece() {
  saveData.heartPieces++;
  // Every 4 heart pieces = 1 new heart (2 HP)
  if (saveData.heartPieces % 4 === 0) {
    if (gameState && gameState.player) {
      if (gameState.player.maxHp < MAX_HEARTS * 2) {
        gameState.player.maxHp += 2;
        gameState.player.hp = gameState.player.maxHp;
        showMessage('Heart Container! Max HP increased!');
      }
    }
  }
}

function addStats(rooms, enemies) {
  saveData.totalRoomsCleared += rooms;
  saveData.totalEnemiesDefeated += enemies;
}

function isDungeonCompleted(dungeonIdx) {
  return saveData.completedDungeons.includes(dungeonIdx);
}

function isDungeonUnlocked(dungeonIdx) {
  if (dungeonIdx === 0) return true;
  return saveData.completedDungeons.includes(dungeonIdx - 1);
}

function getSaveSummary() {
  return {
    dungeonsCompleted: saveData.completedDungeons.length,
    dungeonsBeaten: saveData.dungeonsBeaten,
    weapons: saveData.weapons.length,
    heartPieces: saveData.heartPieces,
    roomsCleared: saveData.totalRoomsCleared,
    enemiesDefeated: saveData.totalEnemiesDefeated,
  };
}

function clearSave() {
  saveData = {
    completedDungeons: [],
    weapons: [],
    heartPieces: 0,
    totalRoomsCleared: 0,
    totalEnemiesDefeated: 0,
    dungeonsBeaten: 0,
    playTime: 0,
  };
  localStorage.removeItem(SAVE_KEY);
  console.log('Save cleared');
}

if (typeof module !== 'undefined' && module.exports) {
  module.exports = { saveData, loadSaveData, saveProgress, markDungeonComplete,
    addWeapon, addHeartPiece, addStats, isDungeonCompleted, isDungeonUnlocked,
    getSaveSummary, clearSave };
}