const { app, BrowserWindow, ipcMain, net, protocol, shell } = require('electron');
const fs = require('node:fs/promises');
const path = require('node:path');

const APP_SCHEME = 'webavp';
const ROOT_DIR = path.resolve(__dirname, '..');
const TEMPLATE_DIR = path.join(ROOT_DIR, 'templates');
const STATIC_DIR = path.join(ROOT_DIR, 'static');

if (process.env.WEBAVP_DISABLE_GPU === '1') {
  app.disableHardwareAcceleration();
}

protocol.registerSchemesAsPrivileged([
  {
    scheme: APP_SCHEME,
    privileges: {
      standard: true,
      secure: true,
      supportFetchAPI: true,
      corsEnabled: true,
      stream: true,
    },
  },
]);

function contentTypeFor(filePath) {
  const ext = path.extname(filePath).toLowerCase();
  switch (ext) {
    case '.html': return 'text/html; charset=utf-8';
    case '.js': return 'text/javascript; charset=utf-8';
    case '.css': return 'text/css; charset=utf-8';
    case '.json': return 'application/json; charset=utf-8';
    case '.svg': return 'image/svg+xml';
    case '.png': return 'image/png';
    case '.jpg':
    case '.jpeg': return 'image/jpeg';
    case '.webp': return 'image/webp';
    case '.mp4': return 'video/mp4';
    case '.webm': return 'video/webm';
    default: return 'application/octet-stream';
  }
}

function safeJoin(baseDir, requestPath) {
  const decoded = decodeURIComponent(requestPath);
  const normalized = path.normalize(decoded).replace(/^([/\\])+/, '');
  const resolved = path.resolve(baseDir, normalized);
  const base = path.resolve(baseDir);
  if (resolved !== base && !resolved.startsWith(base + path.sep)) {
    throw new Error('Path traversal blocked');
  }
  return resolved;
}

async function serveFile(filePath) {
  try {
    const data = await fs.readFile(filePath);
    return new Response(data, {
      headers: { 'content-type': contentTypeFor(filePath) },
    });
  } catch (err) {
    if (err && err.code === 'ENOENT') {
      return new Response('Not found', { status: 404 });
    }
    console.error('[WebAVP] app protocol error:', err);
    return new Response('Internal server error', { status: 500 });
  }
}

function registerAppProtocol() {
  protocol.handle(APP_SCHEME, async (request) => {
    const url = new URL(request.url);
    if (url.hostname !== 'app') {
      return new Response('Unknown host', { status: 404 });
    }

    if (url.pathname === '/' || url.pathname === '/index.html') {
      return serveFile(path.join(TEMPLATE_DIR, 'index.html'));
    }

    if (url.pathname.startsWith('/static/')) {
      try {
        const relativeStaticPath = url.pathname.slice('/static/'.length);
        return serveFile(safeJoin(STATIC_DIR, relativeStaticPath));
      } catch (err) {
        return new Response('Forbidden', { status: 403 });
      }
    }

    return new Response('Not found', { status: 404 });
  });
}

async function verifyCertificateOnline(_event, { serial, certificateHash } = {}) {
  if (!serial || !certificateHash) {
    return { verified: false, error: 'Missing parameters' };
  }

  const params = new URLSearchParams({
    serial: String(serial).toLowerCase(),
    certificateHash: String(certificateHash),
  });
  const url = `https://aware.avasecurity.com/api/v1/public/verifyServerCertificate?${params.toString()}`;

  try {
    const response = await net.fetch(url, { method: 'GET' });
    if (response.ok) {
      return { verified: true };
    }
    return { verified: false, error: `HTTP ${response.status}` };
  } catch (err) {
    return { verified: false, error: err.message || 'Certificate verification request failed' };
  }
}

function createWindow() {
  const win = new BrowserWindow({
    width: 1440,
    height: 960,
    minWidth: 1024,
    minHeight: 720,
    backgroundColor: '#121826',
    title: 'Alta Video Player',
    webPreferences: {
      preload: path.join(__dirname, 'preload.js'),
      contextIsolation: true,
      nodeIntegration: false,
      sandbox: true,
    },
  });

  win.loadURL(`${APP_SCHEME}://app/index.html`);

  if (process.env.WEBAVP_SMOKE_QUIT_AFTER_MS) {
    const quitAfterMs = Number(process.env.WEBAVP_SMOKE_QUIT_AFTER_MS);
    win.webContents.once('did-finish-load', async () => {
      try {
        const result = await win.webContents.executeJavaScript(`({
          title: document.title,
          hasJsZip: typeof window.JSZip === 'function',
          hasNativeBridge: !!window.webavpNative?.verifyCertificateOnline
        })`);
        if (result.title !== 'Alta Video Player' || !result.hasJsZip || !result.hasNativeBridge) {
          console.error('[WebAVP] Electron smoke checks failed:', JSON.stringify(result));
          app.exit(1);
          return;
        }
        console.log('[WebAVP] Electron smoke loaded webavp://app/index.html with JSZip and native bridge');
        setTimeout(() => app.quit(), Number.isFinite(quitAfterMs) ? quitAfterMs : 250);
      } catch (err) {
        console.error('[WebAVP] Electron smoke failed:', err);
        app.exit(1);
      }
    });
    win.webContents.once('did-fail-load', (_event, errorCode, errorDescription, validatedURL) => {
      console.error(`[WebAVP] Electron smoke failed to load ${validatedURL}: ${errorCode} ${errorDescription}`);
      app.exit(1);
    });
  }

  win.webContents.setWindowOpenHandler(({ url }) => {
    shell.openExternal(url);
    return { action: 'deny' };
  });

  return win;
}

app.whenReady().then(() => {
  registerAppProtocol();
  ipcMain.handle('certificate:verify-online', verifyCertificateOnline);
  createWindow();

  app.on('activate', () => {
    if (BrowserWindow.getAllWindows().length === 0) createWindow();
  });
});

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