'use strict';

const { app, BrowserWindow, ipcMain, dialog, Menu } = require('electron');
const path = require('path');
const { spawn } = require('child_process');
const { loadConfig, saveGameDir, resolveGameDir } = require('./lib/config-store');
const { applyPatches, wowExePath, wowInstallValid, doAuth } = require('./lib/patch');
const { setupAutoUpdater } = require('./lib/auto-update');

let mainWindow;
let autoUpdateApi = {
  checkNow: async () => ({ skipped: true, reason: 'not initialized' }),
};

function createWindow() {
  mainWindow = new BrowserWindow({
    width: 720,
    height: 640,
    show: false,
    autoHideMenuBar: true,
    webPreferences: {
      preload: path.join(__dirname, 'preload.cjs'),
      contextIsolation: true,
      nodeIntegration: false,
      sandbox: false,
    },
  });
  Menu.setApplicationMenu(null);
  mainWindow.loadFile(path.join(__dirname, 'index.html'));
  mainWindow.once('ready-to-show', () => mainWindow.show());
}

function sendProgress(msg) {
  if (mainWindow && !mainWindow.isDestroyed()) {
    mainWindow.webContents.send('launcher:progress', msg);
  }
}

async function readMergedConfig() {
  const { configPath, config } = await loadConfig(app);
  const gameDir = resolveGameDir(config, configPath);
  const merged = { ...config, game_dir: gameDir };
  return { configPath, config: merged };
}

app.whenReady().then(async () => {
  createWindow();
  const { config } = await loadConfig(app);
  const tokenEnv = config.github && config.github.token_env;
  const token =
    (tokenEnv && String(process.env[tokenEnv] || '').trim()) ||
    String(process.env.GH_TOKEN || process.env.GITHUB_TOKEN || '').trim();
  const updateFeedUrl = String(process.env.LAUNCHER_UPDATE_URL || config.update_feed_url || '').trim();
  autoUpdateApi = setupAutoUpdater(app, () => mainWindow, {
    updateFeedUrl,
    githubOwner: config.github && config.github.owner,
    githubRepo: config.github && config.github.repo,
    token,
  });
  app.on('activate', () => {
    if (BrowserWindow.getAllWindows().length === 0) createWindow();
  });
});

app.on('window-all-closed', () => {
  if (process.platform !== 'darwin') app.quit();
});

ipcMain.handle('launcher:load', async () => {
  const { configPath, config } = await readMergedConfig();
  return {
    configPath,
    gameDir: config.game_dir || '',
    authEnabled: !!(config.auth && config.auth.enabled),
    wowExe: (config.launch && config.launch.exe) || 'Wow.exe',
    wowOk: wowInstallValid(config),
  };
});

ipcMain.handle('launcher:saveGameDir', async (_e, dir) => {
  const trimmed = String(dir || '').trim();
  if (!trimmed) throw new Error('folder path is empty');
  const { configPath } = await loadConfig(app);
  const norm = path.normalize(trimmed);
  const probe = { ...(await readMergedConfig()).config, game_dir: norm };
  if (!wowInstallValid(probe)) {
    throw new Error(`That folder does not contain ${(probe.launch && probe.launch.exe) || 'Wow.exe'}`);
  }
  const c = await saveGameDir(configPath, norm);
  const merged = { ...c, game_dir: resolveGameDir(c, configPath) };
  return { ok: true, gameDir: merged.game_dir, wowOk: wowInstallValid(merged) };
});

ipcMain.handle('launcher:pickFolder', async (_e, startDir) => {
  const win = BrowserWindow.getFocusedWindow() || mainWindow;
  const r = await dialog.showOpenDialog(win, {
    title: 'Select World of Warcraft 3.3.5a folder',
    properties: ['openDirectory', 'createDirectory'],
    defaultPath: startDir && String(startDir).trim() ? String(startDir).trim() : undefined,
  });
  if (r.canceled || !r.filePaths || !r.filePaths[0]) return { canceled: true, path: '' };
  return { canceled: false, path: r.filePaths[0] };
});

ipcMain.handle('launcher:auth', async (_e, { user, pass }) => {
  const { config } = await readMergedConfig();
  await doAuth(config, user, pass);
  return { ok: true };
});

ipcMain.handle('launcher:sync', async () => {
  const { config } = await readMergedConfig();
  if (!wowInstallValid(config)) {
    throw new Error('Set a valid WoW folder (must contain Wow.exe) first.');
  }
  await applyPatches(config, sendProgress);
  return { ok: true };
});

ipcMain.handle('launcher:checkUpdates', async () => {
  try {
    return await autoUpdateApi.checkNow();
  } catch (e) {
    const msg = e && (e.message || String(e));
    return { ok: false, error: msg };
  }
});

ipcMain.handle('launcher:play', async () => {
  const { config } = await readMergedConfig();
  const exe = wowExePath(config);
  const args = (config.launch && config.launch.args) || [];
  const child = spawn(exe, args, {
    cwd: config.game_dir,
    detached: true,
    stdio: 'ignore',
    windowsHide: true,
    shell: false,
  });
  child.unref();
  return { ok: true };
});