const { app, BrowserWindow, ipcMain, dialog, clipboard, nativeTheme, Tray, Menu } = require('electron');
nativeTheme.themeSource = 'dark';
const path = require('path');
const fs = require('fs');
const ConfigStore = require('./lib/config-store');
const UploadManager = require('./lib/upload-manager');
const { HOSTER_CONFIGS } = require('./lib/hosters');
const VidmolyUploader = require('./lib/vidmoly-upload');
const VoeUploader = require('./lib/voe-upload');
const DoodstreamUploader = require('./lib/doodstream-upload');
const { checkForUpdate, installUpdate, abortUpdate } = require('./lib/updater');
const backupCrypto = require('./lib/backup-crypto');
const FolderMonitor = require('./lib/folder-monitor');
const RemoteServer = require('./lib/remote-server');

let mainWindow;
let dropTargetWindow = null;
let tray = null;
const configStore = new ConfigStore(app);
let uploadManager = null;
let folderMonitor = new FolderMonitor();
let remoteServer = null;
let captureWindow = null;
let captureWindowReady = false;
let signalingQueue = [];
const HEALTH_CHECK_TIMEOUT = 25000;

// --- Debug logging (writes to upload-debug.log next to the app) ---
function getDebugLogPath() {
  const baseDir = app.isPackaged
    ? path.dirname(process.execPath)
    : __dirname;
  return path.join(baseDir, 'upload-debug.log');
}

function debugLog(msg) {
  try {
    const ts = new Date().toISOString();
    fs.appendFileSync(getDebugLogPath(), `[${ts}] ${msg}\n`, 'utf-8');
  } catch {}
}

// Catch unhandled rejections from fire-and-forget async calls
process.on('unhandledRejection', (reason) => {
  debugLog(`UNHANDLED REJECTION: ${reason && reason.stack ? reason.stack : reason}`);
});

function withTimeout(promise, timeoutMs, label) {
  return new Promise((resolve, reject) => {
    const timer = setTimeout(() => {
      reject(new Error(`${label} Timeout`));
    }, timeoutMs);

    promise
      .then((result) => {
        clearTimeout(timer);
        resolve(result);
      })
      .catch((err) => {
        clearTimeout(timer);
        reject(err);
      });
  });
}

function normalizeApiError(payload, fallback) {
  if (!payload || typeof payload !== 'object') return fallback;
  const msg = String(payload.msg || payload.message || '').trim();
  if (msg) return msg;
  if (payload.status) return `API Status ${payload.status}`;
  return fallback;
}

function getDefaultLogFilePath() {
  const baseDir = app.isPackaged
    ? path.dirname(process.execPath)
    : path.join(__dirname);
  return path.join(baseDir, 'fileuploader.log');
}

function getBaseLogFilePath() {
  const config = configStore.load();
  const customPath = config && config.globalSettings
    ? String(config.globalSettings.logFilePath || '').trim()
    : '';
  return customPath || getDefaultLogFilePath();
}

// Daily log: one file per day, reused across sessions on the same day
let _dailyLogPath = null;
let _dailyLogDate = null;

function getLogFilePath() {
  const config = configStore.load();
  const useDailyLog = config && config.globalSettings && config.globalSettings.sessionLog;
  if (!useDailyLog) return getBaseLogFilePath();

  const now = new Date();
  const pad = (n) => String(n).padStart(2, '0');
  const today = `${now.getFullYear()}-${pad(now.getMonth() + 1)}-${pad(now.getDate())}`;

  // Reuse path if same day, otherwise generate new
  if (_dailyLogDate !== today) {
    const base = getBaseLogFilePath();
    const dir = path.dirname(base);
    const ext = path.extname(base);
    const name = path.basename(base, ext);
    _dailyLogPath = path.join(dir, `${name}-${today}${ext}`);
    _dailyLogDate = today;
  }
  return _dailyLogPath;
}

function appendUploadLog(hoster, link, fileName) {
  try {
    const logPath = getLogFilePath();
    fs.mkdirSync(path.dirname(logPath), { recursive: true });
    const now = new Date();
    const pad = (n) => String(n).padStart(2, '0');
    const dateStr = `${now.getFullYear()}-${pad(now.getMonth() + 1)}-${pad(now.getDate())} ${pad(now.getHours())}:${pad(now.getMinutes())}:${pad(now.getSeconds())}`;
    const line = `${dateStr}|${hoster}|${link}||${fileName}|\n`;
    fs.appendFileSync(logPath, line, 'utf-8');
  } catch {}
}

// --- Multi-account helpers ---
function hosterAccountHasCreds(name, account) {
  if (!account) return false;
  if (account.authType === 'api') return !!account.apiKey;
  if (account.authType === 'login') return !!(account.username && account.password);
  // Fallback for old format
  if (name === 'vidmoly.me') return !!(account.username && account.password);
  if (name === 'voe.sx' || name === 'doodstream.com') return !!(account.username && account.password) || !!account.apiKey;
  return !!account.apiKey;
}

function getPrimaryAccount(config, hosterName) {
  const accounts = config.hosters[hosterName];
  if (!Array.isArray(accounts)) return null;
  return accounts.find(a => a.enabled !== false && hosterAccountHasCreds(hosterName, a)) || null;
}

function getNextFallbackAccount(config, hosterName, failedAccountId) {
  const accounts = config.hosters[hosterName];
  if (!Array.isArray(accounts)) return null;
  const failedIndex = accounts.findIndex(a => a.id === failedAccountId);
  if (failedIndex < 0) return null;
  for (let i = failedIndex + 1; i < accounts.length; i++) {
    if (accounts[i].enabled !== false && hosterAccountHasCreds(hosterName, accounts[i])) {
      return accounts[i];
    }
  }
  return null;
}

function buildTaskFromAccount(hoster, account, extra) {
  const task = { ...extra, hoster, accountId: account.id };
  if (account.authType === 'api' && account.apiKey) {
    task.apiKey = account.apiKey;
  } else if (account.username && account.password) {
    task.username = account.username;
    task.password = account.password;
  } else if (account.apiKey) {
    task.apiKey = account.apiKey;
  }
  return task;
}

function buildUploadTasks(config, files, hosters) {
  const tasks = [];
  for (const file of files) {
    for (const hoster of hosters) {
      const account = getPrimaryAccount(config, hoster);
      if (!account) { debugLog(`  skip ${hoster}: no enabled account with creds`); continue; }
      tasks.push(buildTaskFromAccount(hoster, account, { file }));
    }
  }
  return tasks;
}

function buildUploadTasksFromJobs(config, jobs) {
  if (!Array.isArray(jobs)) return [];
  return jobs.flatMap((job) => {
    if (!job || !job.file || !job.hoster) return [];
    const account = getPrimaryAccount(config, job.hoster);
    if (!account) { debugLog(`  skip ${job.hoster}: no enabled account`); return []; }
    return [buildTaskFromAccount(job.hoster, account, { file: job.file, jobId: job.id || job.jobId || null })];
  });
}

async function checkDoodstreamHealth(hosterConfig, otp) {
  const username = hosterConfig && hosterConfig.username
    ? String(hosterConfig.username).trim()
    : '';
  const password = hosterConfig && hosterConfig.password
    ? String(hosterConfig.password).trim()
    : '';

  // Login-based check (preferred)
  if (username && password) {
    const uploader = new DoodstreamUploader();
    try {
      await uploader.login(username, password, otp || undefined);
    } catch (err) {
      if (err.otpRequired) {
        return { status: 'otp_required', message: err.message || 'OTP erforderlich' };
      }
      throw err;
    }
    return { status: 'ok', message: 'Login ok, Upload-Seite bereit' };
  }

  // Fall back to API key check
  const apiKey = hosterConfig && hosterConfig.apiKey
    ? String(hosterConfig.apiKey).trim()
    : '';

  if (!apiKey) {
    return { status: 'error', message: 'Login oder API Key fehlt' };
  }

  const apiBase = HOSTER_CONFIGS['doodstream.com'].apiBase;

  const accountRes = await fetch(`${apiBase}/api/account/info?key=${encodeURIComponent(apiKey)}`, {
    method: 'GET',
    redirect: 'follow'
  });
  const accountPayload = await accountRes.json().catch(() => null);
  if (!accountPayload || typeof accountPayload !== 'object') {
    return { status: 'error', message: 'Account-Check lieferte kein gültiges JSON' };
  }

  if (Number(accountPayload.status || 0) !== 200) {
    return {
      status: 'error',
      message: normalizeApiError(accountPayload, 'Account-Check fehlgeschlagen')
    };
  }

  const serverRes = await fetch(`${apiBase}/api/upload/server?key=${encodeURIComponent(apiKey)}`, {
    method: 'GET',
    redirect: 'follow'
  });
  const serverPayload = await serverRes.json().catch(() => null);
  if (!serverPayload || typeof serverPayload !== 'object') {
    return { status: 'warn', message: 'Upload-Server-Check lieferte kein gültiges JSON' };
  }

  const serverResult = serverPayload.result;
  if (typeof serverResult === 'string' && /^https?:\/\//i.test(serverResult.trim())) {
    return { status: 'ok', message: 'API Key gültig, Upload-Server verfügbar' };
  }

  const serverMsg = String(serverPayload.msg || serverPayload.message || '').trim();
  if (/no servers available/i.test(serverMsg)) {
    return {
      status: 'warn',
      message: 'API Key gültig, aktuell kein Server von API (Uploader nutzt Fallback)'
    };
  }

  return {
    status: 'warn',
    message: serverMsg || 'API Key gültig, Upload-Server aktuell nicht geliefert'
  };
}

async function checkVidmolyHealth(hosterConfig) {
  const username = hosterConfig && hosterConfig.username
    ? String(hosterConfig.username).trim()
    : '';
  const password = hosterConfig && hosterConfig.password
    ? String(hosterConfig.password).trim()
    : '';

  if (!username || !password) {
    return { status: 'error', message: 'Username oder Passwort fehlt' };
  }

  const uploader = new VidmolyUploader();
  await uploader.login(username, password);
  const { uploadUrl, fileFieldName } = await uploader.getUploadParams();

  if (!uploadUrl || !/^https?:\/\//i.test(uploadUrl)) {
    return { status: 'error', message: 'Upload-URL wurde nicht erkannt' };
  }

  return {
    status: 'ok',
    message: `Login ok, Upload-Form bereit (Dateifeld: ${fileFieldName || 'file'})`
  };
}

async function checkVoeHealth(hosterConfig) {
  const username = hosterConfig && hosterConfig.username
    ? String(hosterConfig.username).trim()
    : '';
  const password = hosterConfig && hosterConfig.password
    ? String(hosterConfig.password).trim()
    : '';

  if (!username || !password) {
    // Fall back to API key check if no login
    const apiKey = hosterConfig && hosterConfig.apiKey
      ? String(hosterConfig.apiKey).trim()
      : '';
    if (!apiKey) {
      return { status: 'error', message: 'Login oder API Key fehlt' };
    }
    // Quick API check
    const res = await fetch(`https://voe.sx/api/upload/server?key=${encodeURIComponent(apiKey)}`, { method: 'GET' });
    const data = await res.json().catch(() => null);
    if (data && data.result && typeof data.result === 'string' && /^https?:\/\//i.test(data.result.trim())) {
      return { status: 'ok', message: 'API Key gültig, Upload-Server verfügbar' };
    }
    const msg = data && (data.msg || data.message) ? String(data.msg || data.message).trim() : '';
    if (/no servers/i.test(msg)) {
      return { status: 'warn', message: 'API Key gültig, aktuell kein Server verfügbar' };
    }
    return { status: 'error', message: msg || 'API Key ungültig oder Server nicht erreichbar' };
  }

  const uploader = new VoeUploader();
  await uploader.login(username, password);
  const { csrfToken } = await uploader._getUploadParams();

  if (!csrfToken) {
    return { status: 'error', message: 'Login ok, aber Upload-Seite liefert kein CSRF-Token' };
  }

  return {
    status: 'ok',
    message: 'Login ok, Upload-Seite bereit'
  };
}

async function checkByseHealth(hosterConfig) {
  const apiKey = hosterConfig && hosterConfig.apiKey
    ? String(hosterConfig.apiKey).trim()
    : '';

  if (!apiKey) {
    return { status: 'error', message: 'API Key fehlt' };
  }

  const apiBase = 'https://api.byse.sx';

  const serverRes = await fetch(`${apiBase}/upload/server?key=${encodeURIComponent(apiKey)}`, {
    method: 'GET',
    redirect: 'follow'
  });
  const serverPayload = await serverRes.json().catch(() => null);

  if (!serverPayload || typeof serverPayload !== 'object') {
    return { status: 'error', message: 'API lieferte kein gültiges JSON' };
  }

  const serverResult = serverPayload.result;
  if (typeof serverResult === 'string' && /^https?:\/\//i.test(serverResult.trim())) {
    return { status: 'ok', message: 'API Key gültig, Upload-Server verfügbar' };
  }

  const msg = String(serverPayload.msg || serverPayload.message || '').trim();

  // Byse API returns { msg: "OK", result: <server-url> } on success.
  // If msg is "OK" but result wasn't a valid URL, treat as success with warning.
  if (/^ok$/i.test(msg)) {
    return { status: 'ok', message: 'API Key gültig' };
  }

  if (msg) {
    return { status: 'error', message: msg };
  }

  return { status: 'error', message: 'API Key ungültig oder Server nicht erreichbar' };
}

// requestedChecks can be:
// - array of strings (hoster names) for legacy/all-accounts check
// - array of { hoster, accountId } for specific account checks
async function runHosterHealthCheck(config, requestedChecks) {
  const allowed = ['doodstream.com', 'vidmoly.me', 'voe.sx', 'byse.sx'];

  // Normalize input to [{ hoster, accountId? }]
  let checks;
  if (!Array.isArray(requestedChecks) || requestedChecks.length === 0) {
    // Check all accounts for all hosters
    checks = [];
    for (const name of allowed) {
      const accounts = config.hosters[name];
      if (Array.isArray(accounts)) {
        for (const acc of accounts) {
          if (hosterAccountHasCreds(name, acc)) checks.push({ hoster: name, accountId: acc.id });
        }
      }
    }
  } else if (typeof requestedChecks[0] === 'string') {
    // Legacy: array of hoster names — check all accounts for each
    checks = [];
    for (const name of requestedChecks) {
      const accounts = config.hosters[name];
      if (Array.isArray(accounts)) {
        for (const acc of accounts) {
          if (hosterAccountHasCreds(name, acc)) checks.push({ hoster: name, accountId: acc.id });
        }
      }
    }
  } else {
    checks = requestedChecks;
  }

  const results = await Promise.all(checks.map(async ({ hoster, accountId, otp }) => {
    if (!allowed.includes(hoster)) {
      return { hoster, accountId, status: 'skipped', message: 'Kein Health-Check fuer diesen Hoster' };
    }

    // Find specific account
    const accounts = config.hosters[hoster];
    const hosterConfig = Array.isArray(accounts) ? accounts.find(a => a.id === accountId) : null;

    try {
      let result;
      if (hoster === 'doodstream.com') {
        result = await withTimeout(checkDoodstreamHealth(hosterConfig, otp), HEALTH_CHECK_TIMEOUT, 'Doodstream-Check');
      } else if (hoster === 'vidmoly.me') {
        result = await withTimeout(checkVidmolyHealth(hosterConfig), HEALTH_CHECK_TIMEOUT, 'Vidmoly-Check');
      } else if (hoster === 'voe.sx') {
        result = await withTimeout(checkVoeHealth(hosterConfig), HEALTH_CHECK_TIMEOUT, 'VOE-Check');
      } else if (hoster === 'byse.sx') {
        result = await withTimeout(checkByseHealth(hosterConfig), HEALTH_CHECK_TIMEOUT, 'Byse-Check');
      } else {
        return { hoster, accountId, status: 'skipped', message: 'Kein Health-Check fuer diesen Hoster' };
      }
      return { hoster, accountId, ...result };
    } catch (err) {
      return { hoster, accountId, status: 'error', message: err && err.message ? err.message : 'Health-Check fehlgeschlagen' };
    }
  }));

  return { checkedAt: new Date().toISOString(), results };
}

function createWindow() {
  mainWindow = new BrowserWindow({
    width: 1100,
    height: 750,
    minWidth: 800,
    minHeight: 550,
    backgroundColor: '#16181c',
    autoHideMenuBar: true,
    webPreferences: {
      contextIsolation: true,
      nodeIntegration: false,
      preload: path.join(__dirname, 'preload.js')
    }
  });

  mainWindow.webContents.setBackgroundThrottling(false);
  mainWindow.loadFile(path.join(__dirname, 'renderer', 'index.html'));
}

function createTray() {
  const iconPath = path.join(__dirname, 'assets', 'app_icon.ico');
  tray = new Tray(iconPath);
  tray.setToolTip('Multi-Hoster-Upload');

  const contextMenu = Menu.buildFromTemplate([
    { label: 'Öffnen', click: () => { if (mainWindow) { mainWindow.show(); mainWindow.focus(); } } },
    { type: 'separator' },
    { label: 'Beenden', click: () => { app.quit(); } }
  ]);
  tray.setContextMenu(contextMenu);

  tray.on('click', () => {
    if (mainWindow) { mainWindow.show(); mainWindow.focus(); }
  });
}

function updateTrayTooltip(text) {
  if (tray && !tray.isDestroyed()) tray.setToolTip(text);
}

app.whenReady().then(() => {
  createWindow();
  createTray();

  // Minimize to tray instead of taskbar
  mainWindow.on('minimize', () => {
    mainWindow.hide();
  });

  // Auto-start folder monitor if enabled
  try {
    const launchConfig = configStore.load();
    const fm = launchConfig.globalSettings && launchConfig.globalSettings.folderMonitor;
    if (fm && fm.enabled && fm.folderPath) {
      startFolderMonitor(fm);
    }
  } catch (err) {
    debugLog(`folder-monitor auto-start failed: ${err.message}`);
  }

  // Auto-start remote server if enabled
  try {
    const _remCfg = configStore.load();
    const remoteConfig = _remCfg.globalSettings && _remCfg.globalSettings.remote;
    if (remoteConfig && remoteConfig.enabled) {
      startRemoteServer().catch(err => {
        debugLog(`remote-server auto-start failed: ${err.message}`);
      });
    }
  } catch (err) {
    debugLog(`remote-server auto-start failed: ${err.message}`);
  }

  // Auto-show drop target if enabled
  try {
    const dtConfig = configStore.load();
    if (dtConfig.globalSettings && dtConfig.globalSettings.showDropTarget) {
      createDropTargetWindow();
    }
  } catch {}

  // Auto-check for updates after 3 seconds
  setTimeout(async () => {
    try {
      debugLog('update-check: starting');
      const result = await checkForUpdate();
      debugLog(`update-check: available=${result && result.available}, remote=${result && result.remoteVersion}`);
      if (result && result.available && mainWindow && !mainWindow.isDestroyed()) {
        mainWindow.webContents.send('app:update-available', result);
      }
    } catch (err) {
      debugLog(`update-check failed: ${err && err.message || err}`);
    }
  }, 3000);
});

app.on('window-all-closed', () => {
  app.quit();
});

app.on('before-quit', () => {
  if (uploadManager) try { uploadManager.cancel(); } catch {}
  try { folderMonitor.stop(); } catch {}
  try {
    if (remoteServer) { remoteServer.stop(); remoteServer = null; }
    destroyCaptureWindow();
  } catch {}
  destroyDropTargetWindow();
});

// --- IPC Handlers ---

// Debug log from renderer
ipcMain.handle('debug-log', (_event, msg) => {
  debugLog(`[RENDERER] ${msg}`);
  return true;
});

ipcMain.handle('get-config', () => {
  return configStore.load();
});

ipcMain.handle('save-config', async (_event, config) => {
  await configStore.save(config);
  return true;
});

ipcMain.handle('get-history', () => {
  return configStore.loadHistory();
});

ipcMain.handle('run-health-check', async (_event, payload) => {
  const config = configStore.load();
  const hosters = payload && Array.isArray(payload.hosters) ? payload.hosters : [];
  return runHosterHealthCheck(config, hosters);
});

ipcMain.handle('select-files', async () => {
  const result = await dialog.showOpenDialog(mainWindow, {
    properties: ['openFile', 'multiSelections'],
    filters: [
      { name: 'Alle Dateien', extensions: ['*'] },
      { name: 'Videos', extensions: ['mp4', 'mkv', 'avi', 'mov', 'wmv', 'flv', 'webm'] }
    ]
  });
  return result.canceled ? null : result.filePaths;
});

// Debug self-test: runs a minimal upload in the main process to verify events work
ipcMain.handle('debug-test-upload', async () => {
  const testFile = path.join(__dirname, 'test-self-check.txt');
  try {
    fs.writeFileSync(testFile, 'selftest ' + Date.now(), 'utf-8');
    const mgr = new UploadManager({ 'voe.sx': { retries: 0, parallelCount: 1, maxSpeedKbs: 0, restartBelowKbs: 0, timeIntervalSec: 0, maxSizeMb: 0 } });
    const events = [];
    return new Promise((resolve) => {
      mgr.on('progress', (data) => { events.push({ s: data.status, e: data.error || null }); });
      mgr.on('batch-done', (summary) => {
        try { fs.unlinkSync(testFile); } catch {}
        resolve({ ok: true, events, summary: { ok: summary.succeeded, fail: summary.failed } });
      });
      mgr.startBatch([{ file: testFile, hoster: 'voe.sx', apiKey: 'invalid-test-key' }]);
      setTimeout(() => {
        try { fs.unlinkSync(testFile); } catch {}
        resolve({ ok: false, events, timeout: true });
      }, 20000);
    });
  } catch (err) {
    try { fs.unlinkSync(testFile); } catch {}
    return { ok: false, error: err.message };
  }
});

ipcMain.handle('select-folder', async () => {
  const result = await dialog.showOpenDialog(mainWindow, {
    properties: ['openDirectory', 'multiSelections']
  });
  if (result.canceled || !result.filePaths.length) return null;

  // Recursively collect all files from selected folders
  const files = [];
  const walk = (dir) => {
    try {
      for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
        const full = path.join(dir, entry.name);
        if (entry.isDirectory()) walk(full);
        else if (entry.isFile()) files.push(full);
      }
    } catch {}
  };
  for (const folder of result.filePaths) walk(folder);
  return files.length > 0 ? files : null;
});

ipcMain.handle('resolve-folder-files', async (_event, folderPath) => {
  const files = [];
  const walk = (dir) => {
    try {
      for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
        const full = path.join(dir, entry.name);
        if (entry.isDirectory()) walk(full);
        else if (entry.isFile()) files.push(full);
      }
    } catch {}
  };
  walk(folderPath);
  return files;
});

ipcMain.handle('start-upload', (_event, payload) => {
  const config = configStore.load();
  const files = payload && Array.isArray(payload.files) ? payload.files : [];
  const hosters = payload && Array.isArray(payload.hosters) ? payload.hosters : [];
  const jobs = payload && Array.isArray(payload.jobs) ? payload.jobs : [];

  debugLog(`start-upload: files=${JSON.stringify(files)}, hosters=${JSON.stringify(hosters)}, jobs=${jobs.length}`);

  const tasks = jobs.length > 0
    ? buildUploadTasksFromJobs(config, jobs)
    : buildUploadTasks(config, files, hosters);

  debugLog(`  tasks built: ${tasks.length}`);

  if (tasks.length === 0) return { error: 'Keine gültigen Zugangsdaten für die gewählten Hoster.' };

  // Pass hoster settings to the upload manager
  uploadManager = new UploadManager(config.hosterSettings || {}, config.globalSettings || {});

  uploadManager.on('progress', (data) => {
    // Only log state changes, not continuous progress updates
    if (data.status !== 'uploading') {
      debugLog(`progress: ${data.fileName} ${data.hoster} ${data.status} ${data.error || ''}`);
    }
    // Write to fileuploader.log immediately when a single upload finishes
    if (data.status === 'done' && data.result) {
      const link = data.result.download_url || data.result.embed_url || data.result.file_code || '';
      if (link) {
        appendUploadLog(data.hoster || '', link, data.fileName || '');
      } else {
        debugLog(`WARNING: done but no link for ${data.fileName} @ ${data.hoster}: ${JSON.stringify(data.result)}`);
      }
    }
    if (mainWindow && !mainWindow.isDestroyed()) {
      mainWindow.webContents.send('upload-progress', data);
    }
  });

  uploadManager.on('stats', (data) => {
    if (mainWindow && !mainWindow.isDestroyed()) {
      mainWindow.webContents.send('upload-stats', data);
    }
    // Update tray tooltip with upload progress
    if (data.state === 'uploading' && data.activeJobs > 0) {
      const speedMb = ((data.globalSpeedKbs || 0) / 1024).toFixed(1);
      updateTrayTooltip(`Upload: ${data.activeJobs} aktiv - ${speedMb} MB/s`);
    } else {
      updateTrayTooltip('Multi-Hoster-Upload');
    }
  });

  uploadManager.on('account-failed', ({ hoster, accountId }) => {
    const cfg = configStore.load();
    const fallback = getNextFallbackAccount(cfg, hoster, accountId);
    if (fallback) {
      debugLog(`account-failed: ${hoster} ${accountId} → fallback to ${fallback.id}`);
      uploadManager.switchAccount(hoster, fallback);
      if (mainWindow && !mainWindow.isDestroyed()) {
        mainWindow.webContents.send('account-switched', { hoster, fromAccountId: accountId, toAccountId: fallback.id });
      }
    } else {
      debugLog(`account-failed: ${hoster} ${accountId} → no fallback available`);
    }
  });

  uploadManager.on('batch-done', async (summary) => {
    debugLog(`batch-done: total=${summary.total} ok=${summary.succeeded} fail=${summary.failed}`);
    try { await configStore.appendHistory(summary); } catch (err) {
      debugLog(`appendHistory failed: ${err.message}`);
    }
    if (mainWindow && !mainWindow.isDestroyed()) {
      mainWindow.webContents.send('upload-batch-done', summary);
    }

    // Shutdown after finish
    handleShutdownAfterFinish();
    uploadManager = null;
  });

  // Defer startBatch to next tick so the IPC response is sent first.
  // This ensures webContents.send() calls from upload events
  // are not interleaved with the handle() response.
  process.nextTick(() => {
    if (!uploadManager) { debugLog('nextTick: uploadManager was nulled before startBatch'); return; }
    debugLog('nextTick: calling startBatch now');
    uploadManager.startBatch(tasks).catch((err) => {
      debugLog(`startBatch REJECTED: ${err && err.stack ? err.stack : err}`);
      // Forward error to renderer as batch-done with failure
      if (mainWindow && !mainWindow.isDestroyed()) {
        mainWindow.webContents.send('upload-batch-done', {
          id: 'error',
          timestamp: new Date().toISOString(),
          total: tasks.length,
          succeeded: 0,
          failed: tasks.length,
          files: [],
          error: err ? err.message : 'Unbekannter Fehler'
        });
      }
    });
  });

  debugLog(`start-upload returning started=true (startBatch deferred to nextTick)`);
  return { started: true, taskCount: tasks.length };
});

ipcMain.handle('cancel-upload', () => {
  if (uploadManager) {
    uploadManager.cancel();
  }
  return true;
});

ipcMain.handle('cancel-selected-jobs', (_event, jobIds) => {
  if (uploadManager) {
    uploadManager.cancelJobs(Array.isArray(jobIds) ? jobIds : []);
  }
  return true;
});

ipcMain.handle('finish-after-active', () => {
  if (uploadManager) {
    uploadManager.finishAfterActive();
  }
  return true;
});

ipcMain.handle('clear-history', async () => {
  await configStore.clearHistory();
  return true;
});

// --- Backup export / import ---
ipcMain.handle('export-backup', async (_event, password) => {
  const config = configStore.load();
  const encrypted = backupCrypto.encrypt(config, password);
  const { canceled, filePath } = await dialog.showSaveDialog(mainWindow, {
    title: 'Backup exportieren',
    defaultPath: `multi-hoster-backup-${new Date().toISOString().slice(0, 10)}.mhu`,
    filters: [{ name: 'Multi-Hoster Backup', extensions: ['mhu'] }]
  });
  if (canceled || !filePath) return { ok: false, canceled: true };
  fs.writeFileSync(filePath, encrypted);
  return { ok: true, path: filePath };
});

ipcMain.handle('import-backup', async (_event, password) => {
  const { canceled, filePaths } = await dialog.showOpenDialog(mainWindow, {
    title: 'Backup importieren',
    filters: [{ name: 'Multi-Hoster Backup', extensions: ['mhu'] }],
    properties: ['openFile']
  });
  if (canceled || !filePaths.length) return { ok: false, canceled: true };
  const buffer = fs.readFileSync(filePaths[0]);
  const imported = backupCrypto.decrypt(buffer, password);
  // Validate imported data has required structure
  if (!imported || typeof imported !== 'object' || !imported.hosters || !imported.hosterSettings || !imported.globalSettings) {
    return { ok: false, error: 'Backup-Datei hat ungültige Struktur (hosters, hosterSettings oder globalSettings fehlt).' };
  }
  // Safety net: timestamped backup so multiple imports don't overwrite each other
  const ts = new Date().toISOString().replace(/[:.]/g, '-');
  const preImportPath = configStore.filePath.replace('.json', `.pre-import-${ts}.json`);
  try { fs.copyFileSync(configStore.filePath, preImportPath); } catch {}
  // Single atomic write — no split state, no TOCTOU race
  const merged = {
    hosters: imported.hosters,
    hosterSettings: imported.hosterSettings,
    globalSettings: imported.globalSettings,
    history: imported.history || []
  };
  await configStore._atomicWrite(JSON.stringify(merged, null, 2));
  return { ok: true, config: configStore.load() };
});

ipcMain.handle('copy-to-clipboard', (_event, text) => {
  clipboard.writeText(text);
  return true;
});

ipcMain.handle('app:check-updates', async () => {
  try {
    return await checkForUpdate();
  } catch (err) {
    return { available: false, error: err.message };
  }
});

ipcMain.handle('app:install-update', () => {
  installUpdate((progress) => {
    if (mainWindow && !mainWindow.isDestroyed()) {
      mainWindow.webContents.send('app:update-progress', progress);
    }
  }).catch((err) => {
    if (mainWindow && !mainWindow.isDestroyed()) {
      mainWindow.webContents.send('app:update-progress', { stage: 'error', error: err.message });
    }
  });
  return { started: true };
});

ipcMain.handle('app:abort-update', () => {
  abortUpdate();
  return true;
});

ipcMain.handle('app:get-version', () => {
  return app.getVersion();
});

// --- Hoster settings ---
ipcMain.handle('get-hoster-settings', () => {
  const config = configStore.load();
  return config.hosterSettings || {};
});

ipcMain.handle('save-hoster-settings', async (_event, hosterSettings) => {
  await configStore.save({ hosterSettings });
  if (uploadManager) uploadManager.updateSettings(hosterSettings, null);
  return true;
});

// --- Global settings ---
ipcMain.handle('get-global-settings', () => {
  const config = configStore.load();
  return config.globalSettings || {};
});

ipcMain.handle('save-global-settings', async (_event, globalSettings) => {
  await configStore.save({ globalSettings });
  if (uploadManager) uploadManager.updateSettings(null, globalSettings);
  return true;
});

// Synchronous save for beforeunload — blocks renderer until write completes
// Uses atomic write pattern (tmp + backup + rename) to prevent corruption
ipcMain.on('save-global-settings-sync', (event, globalSettings) => {
  try {
    const current = configStore.load();
    current.globalSettings = globalSettings;
    const data = JSON.stringify(current, null, 2);
    const tmpPath = configStore.filePath + '.tmp';
    const backupPath = configStore.filePath + '.bak';
    fs.writeFileSync(tmpPath, data, 'utf-8');
    if (fs.existsSync(configStore.filePath)) {
      const existing = fs.readFileSync(configStore.filePath, 'utf-8');
      if (existing && existing.trim().length > 2) {
        fs.writeFileSync(backupPath, existing, 'utf-8');
      }
    }
    fs.renameSync(tmpPath, configStore.filePath);
  } catch {}
  event.returnValue = true;
});

// --- Folder Monitor ---
function startFolderMonitor(settings) {
  try {
    folderMonitor.stop();
    folderMonitor.removeAllListeners();
    folderMonitor.on('new-files', (files) => {
      debugLog(`folder-monitor: ${files.length} new file(s)`);
      if (mainWindow && !mainWindow.isDestroyed()) {
        mainWindow.webContents.send('folder-monitor:new-files', files);
      }
    });
    folderMonitor.on('error', (err) => {
      debugLog(`folder-monitor error: ${err.message}`);
    });
    folderMonitor.start(settings);
    debugLog(`folder-monitor started: ${settings.folderPath}`);
  } catch (err) {
    debugLog(`folder-monitor start failed: ${err.message}`);
    throw err;
  }
}

ipcMain.handle('folder-monitor:start', (_event, settings) => {
  startFolderMonitor(settings);
  return { ok: true };
});

ipcMain.handle('folder-monitor:stop', () => {
  folderMonitor.stop();
  debugLog('folder-monitor stopped');
  return { ok: true };
});

ipcMain.handle('folder-monitor:status', () => {
  return folderMonitor.status();
});

ipcMain.handle('folder-monitor:select-folder', async () => {
  const result = await dialog.showOpenDialog(mainWindow, {
    properties: ['openDirectory']
  });
  if (result.canceled || !result.filePaths.length) return null;
  return result.filePaths[0];
});

// --- Remote Control ---
function generateToken() {
  const crypto = require('crypto');
  return crypto.randomBytes(32).toString('hex');
}

function createCaptureWindow() {
  if (captureWindow && !captureWindow.isDestroyed()) return;
  captureWindowReady = false;
  captureWindow = new BrowserWindow({
    show: false,
    webPreferences: {
      contextIsolation: true,
      nodeIntegration: false,
      preload: path.join(__dirname, 'lib', 'remote-capture-preload.js')
    }
  });
  captureWindow.loadFile(path.join(__dirname, 'lib', 'remote-capture.html'));

  // Wait for window to be fully loaded before sending signaling messages
  captureWindow.webContents.on('dom-ready', () => {
    debugLog('remote: capture window ready, draining', signalingQueue.length, 'queued messages');
    captureWindowReady = true;
    for (const msg of signalingQueue) {
      captureWindow.webContents.send('remote:signaling-to-capture', msg);
    }
    signalingQueue = [];
  });

  // Crash recovery: if hidden window closes unexpectedly while clients connected, recreate it
  captureWindow.on('closed', () => {
    captureWindow = null;
    captureWindowReady = false;
    signalingQueue = [];
    if (remoteServer && remoteServer.getClientCount() > 0) {
      debugLog('remote: capture window crashed, recreating...');
      createCaptureWindow();
    }
  });
}

function destroyCaptureWindow() {
  if (captureWindow && !captureWindow.isDestroyed()) {
    captureWindow.close();
    captureWindow = null;
  }
}

async function startRemoteServer() {
  if (remoteServer) {
    remoteServer.stop();
    remoteServer = null;
  }

  const config = configStore.load();
  const remote = config.globalSettings && config.globalSettings.remote;
  if (!remote || !remote.enabled) return;

  let token = remote.token;
  if (!token) {
    token = generateToken();
    const gs = { ...config.globalSettings, remote: { ...remote, token } };
    await configStore.save({ globalSettings: gs });
  }

  remoteServer = new RemoteServer();
  await remoteServer.start({
    port: remote.port || 9100,
    token,
    allowInput: remote.allowInput !== false,
    mainWindow,
    onSignalingToCapture: (data) => {
      if (!captureWindow || captureWindow.isDestroyed()) {
        debugLog('remote: signaling dropped, no capture window');
        return;
      }
      if (captureWindowReady) {
        captureWindow.webContents.send('remote:signaling-to-capture', data);
      } else {
        debugLog('remote: capture window not ready, queuing', data.type, 'message');
        signalingQueue.push(data);
      }
    },
    onCreateCaptureWindow: () => createCaptureWindow(),
    onDestroyCaptureWindow: () => destroyCaptureWindow()
  });

  debugLog(`remote-server started on port ${remoteServer.getPort()}`);
}

// IPC: Signaling from capture window back to dashboard client
ipcMain.on('remote:signaling-from-capture', (_event, data) => {
  if (remoteServer && data.clientId) {
    remoteServer.sendToClient(data.clientId, data);
  }
});

// IPC: Debug logging from capture window
ipcMain.on('remote:capture-log', (_event, msg) => {
  debugLog('remote-capture:', msg);
});

// IPC: Input events from capture window
ipcMain.on('remote:input-event', (_event, data) => {
  if (!mainWindow || mainWindow.isDestroyed()) return;

  const config = configStore.load();
  const remote = config.globalSettings && config.globalSettings.remote;
  if (!remote || !remote.allowInput) return;
  if (data.role !== 'admin') return;

  // Capture includes window frame (title bar) but NOT invisible DWM borders
  // sendInputEvent coordinates are relative to web content area
  const winBounds = mainWindow.getBounds();
  const contentBounds = mainWindow.getContentBounds();
  // Windows 10/11: getBounds() includes ~7px invisible resize borders not in capture
  const dwm = process.platform === 'win32' ? 7 : 0;
  const capturedW = winBounds.width - 2 * dwm;
  const capturedH = winBounds.height - dwm; // only bottom has invisible border
  const contentOffsetX = contentBounds.x - (winBounds.x + dwm);
  const contentOffsetY = contentBounds.y - winBounds.y;
  const rawX = typeof data.x === 'number' && isFinite(data.x) ? data.x : 0;
  const rawY = typeof data.y === 'number' && isFinite(data.y) ? data.y : 0;
  const x = Math.round(rawX * capturedW - contentOffsetX);
  const y = Math.round(rawY * capturedH - contentOffsetY);

  switch (data.type) {
    case 'mousemove':
      mainWindow.webContents.sendInputEvent({ type: 'mouseMove', x, y });
      break;
    case 'mousedown':
      mainWindow.webContents.sendInputEvent({
        type: 'mouseDown', x, y,
        button: data.button === 'right' ? 'right' : 'left',
        clickCount: 1
      });
      break;
    case 'mouseup':
      mainWindow.webContents.sendInputEvent({
        type: 'mouseUp', x, y,
        button: data.button === 'right' ? 'right' : 'left',
        clickCount: 1
      });
      break;
    case 'scroll':
      mainWindow.webContents.sendInputEvent({
        type: 'mouseWheel', x, y,
        deltaX: data.deltaX || 0,
        deltaY: data.deltaY || 0
      });
      break;
    case 'keydown':
      mainWindow.webContents.sendInputEvent({
        type: 'keyDown',
        keyCode: data.key,
        modifiers: buildModifiers(data)
      });
      if (data.key.length === 1) {
        mainWindow.webContents.sendInputEvent({
          type: 'char',
          keyCode: data.key,
          modifiers: buildModifiers(data)
        });
      }
      break;
    case 'keyup':
      mainWindow.webContents.sendInputEvent({
        type: 'keyUp',
        keyCode: data.key,
        modifiers: buildModifiers(data)
      });
      break;
  }
});

function buildModifiers(data) {
  const mods = [];
  if (data.shift) mods.push('shift');
  if (data.ctrl) mods.push('control');
  if (data.alt) mods.push('alt');
  return mods;
}

// IPC: Get capture source ID (desktopCapturer must run in main process in Electron 33+)
ipcMain.handle('remote:get-capture-source-id', async () => {
  if (!mainWindow || mainWindow.isDestroyed()) {
    debugLog('remote: capture source - mainWindow not available');
    return null;
  }
  // Use getMediaSourceId() for exact window capture without enumeration
  const sourceId = mainWindow.getMediaSourceId();
  debugLog('remote: capture source - getMediaSourceId:', sourceId);
  if (sourceId) return sourceId;

  // Fallback: enumerate sources
  const { desktopCapturer } = require('electron');
  const sources = await desktopCapturer.getSources({ types: ['window', 'screen'] });
  const title = mainWindow.getTitle();
  debugLog('remote: capture source - fallback, looking for title:', title);
  let source = sources.find(s => s.name === title);
  if (!source) source = sources.find(s => s.name.includes('Multi-Hoster'));
  if (!source) source = sources.find(s => s.id.startsWith('screen:'));
  debugLog('remote: capture source -', source ? `found: ${source.name} (${source.id})` : 'NONE FOUND');
  return source ? source.id : null;
});

// IPC: Client count updates from capture window
ipcMain.on('remote:client-count', (_event, count) => {
  if (mainWindow && !mainWindow.isDestroyed()) {
    mainWindow.webContents.send('remote:client-count', count);
  }
});

// IPC: Remote settings
ipcMain.handle('remote:get-settings', () => {
  const config = configStore.load();
  return config.globalSettings && config.globalSettings.remote || {};
});

ipcMain.handle('remote:save-settings', async (_event, remoteSettings) => {
  const config = configStore.load();
  const gs = { ...config.globalSettings, remote: remoteSettings };
  await configStore.save({ globalSettings: gs });

  if (remoteSettings.enabled) {
    await startRemoteServer();
  } else if (remoteServer) {
    remoteServer.stop();
    remoteServer = null;
    destroyCaptureWindow();
    debugLog('remote-server stopped');
  }
  return true;
});

ipcMain.handle('remote:generate-token', () => {
  return generateToken();
});

ipcMain.handle('remote:status', () => {
  return {
    running: !!remoteServer,
    port: remoteServer ? remoteServer.getPort() : null,
    clientCount: remoteServer ? remoteServer.getClientCount() : 0
  };
});

// --- Always on top ---
ipcMain.handle('set-always-on-top', async (_event, value) => {
  if (mainWindow && !mainWindow.isDestroyed()) {
    mainWindow.setAlwaysOnTop(!!value);
  }
  await configStore.save({ globalSettings: { ...configStore.load().globalSettings, alwaysOnTop: !!value } });
  return true;
});

ipcMain.handle('get-always-on-top', () => {
  if (mainWindow && !mainWindow.isDestroyed()) {
    return mainWindow.isAlwaysOnTop();
  }
  return false;
});

// --- Drop Target Window ---
function createDropTargetWindow() {
  if (dropTargetWindow && !dropTargetWindow.isDestroyed()) return;
  const { screen } = require('electron');
  const display = screen.getPrimaryDisplay();
  const { width, height } = display.workAreaSize;
  dropTargetWindow = new BrowserWindow({
    width: 120,
    height: 120,
    x: width - 140,
    y: height - 140,
    frame: false,
    transparent: true,
    alwaysOnTop: true,
    skipTaskbar: true,
    resizable: false,
    minimizable: false,
    maximizable: false,
    focusable: false,
    webPreferences: {
      contextIsolation: true,
      nodeIntegration: false,
      preload: path.join(__dirname, 'preload-drop-target.js')
    }
  });
  dropTargetWindow.loadFile('renderer/drop-target.html');
  dropTargetWindow.on('closed', () => { dropTargetWindow = null; });
}

function destroyDropTargetWindow() {
  if (dropTargetWindow && !dropTargetWindow.isDestroyed()) {
    dropTargetWindow.close();
    dropTargetWindow = null;
  }
}

ipcMain.handle('show-drop-target', () => {
  createDropTargetWindow();
  return true;
});

ipcMain.handle('hide-drop-target', () => {
  destroyDropTargetWindow();
  return true;
});

ipcMain.on('drop-target:files', (_event, paths) => {
  if (mainWindow && !mainWindow.isDestroyed()) {
    if (!mainWindow.isVisible() || mainWindow.isMinimized()) {
      mainWindow.show();
      mainWindow.focus();
    }
    mainWindow.webContents.send('drop-target:files', paths);
  }
});

// --- Shutdown after finish ---
let shutdownMode = 'nothing';
let shutdownTimer = null;

ipcMain.handle('set-shutdown-after-finish', (_event, mode) => {
  shutdownMode = mode || 'nothing';
  // Cancel active countdown if mode changed to 'nothing'
  if (shutdownMode === 'nothing' && shutdownTimer) {
    clearTimeout(shutdownTimer);
    shutdownTimer = null;
  }
  return true;
});

ipcMain.handle('get-shutdown-after-finish', () => {
  return shutdownMode;
});

ipcMain.handle('cancel-shutdown', () => {
  if (shutdownTimer) {
    clearTimeout(shutdownTimer);
    shutdownTimer = null;
  }
  shutdownMode = 'nothing';
  return true;
});

function handleShutdownAfterFinish() {
  if (shutdownMode === 'nothing') return;

  const { exec } = require('child_process');

  // Notify renderer
  if (mainWindow && !mainWindow.isDestroyed()) {
    mainWindow.webContents.send('shutdown-countdown', { mode: shutdownMode, seconds: 60 });
  }

  // Clear any previous countdown to prevent orphaned timers
  if (shutdownTimer) clearTimeout(shutdownTimer);

  shutdownTimer = setTimeout(() => {
    // Read current mode at execution time (not captured at scheduling time)
    if (shutdownMode === 'shutdown') {
      exec('shutdown /s /t 0', (err) => { if (err) debugLog(`shutdown failed: ${err.message}`); });
    } else if (shutdownMode === 'restart') {
      exec('shutdown /r /t 0', (err) => { if (err) debugLog(`restart failed: ${err.message}`); });
    } else if (shutdownMode === 'sleep') {
      exec('rundll32.exe powrprof.dll,SetSuspendState 0,1,0', (err) => { if (err) debugLog(`sleep failed: ${err.message}`); });
    }
    // else: mode was changed to 'nothing' during countdown — do nothing
  }, 60000);
}

// Restore always-on-top from config on window creation
app.on('browser-window-created', () => {
  const config = configStore.load();
  if (config.globalSettings && config.globalSettings.alwaysOnTop && mainWindow) {
    mainWindow.setAlwaysOnTop(true);
  }
});