import { app, BrowserWindow, ipcMain } from 'electron';
import path from 'path';
import { fileURLToPath } from 'url';
import fs from 'fs';
import http from 'http';

function parseArgs() {
  const args = { docs: null, headless: false, port: null };
  const docsIndex = process.argv.indexOf('--docs');
  if (docsIndex !== -1 && process.argv[docsIndex + 1]) {
    args.docs = process.argv[docsIndex + 1];
  }
  if (process.argv.includes('--headless')) {
    args.headless = true;
  }
  const portIndex = process.argv.indexOf('--port');
  if (portIndex !== -1 && process.argv[portIndex + 1]) {
    args.port = parseInt(process.argv[portIndex + 1], 10);
  }
  return args;
}

const argsGlobal = parseArgs();

if (argsGlobal.headless) {
  app.commandLine.appendSwitch('disable-gpu');
  app.commandLine.appendSwitch('disable-software-rasterizer');
  app.commandLine.appendSwitch('no-sandbox');
  app.disableHardwareAcceleration();
}

app.commandLine.appendSwitch('disable-gpu-shader-disk-cache');

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);

let mainWindow = null;
let httpServer = null;
const LOG_FILE = app.isPackaged 
  ? path.join(app.getPath('userData'), 'electron.log')
  : path.join(__dirname, '..', 'electron.log');

function log(...args) {
  const msg = args.map(a => typeof a === 'object' ? JSON.stringify(a) : String(a)).join(' ');
  const ts = new Date().toISOString();
  const line = `[${ts}] [main] ${msg}\n`;
  fs.appendFileSync(LOG_FILE, line);
  console.log(line.trim());
}

process.stdout.write(`[${new Date().toISOString()}] [main] XCSDD starting in ${argsGlobal.headless ? 'HEADLESS' : 'normal'} mode\n`);
process.stdout.write(`[${new Date().toISOString()}] [main] Args: docs=${argsGlobal.docs}, headless=${argsGlobal.headless}, port=${argsGlobal.port}\n`);

function getIndexPath() {
  if (app.isPackaged) {
    return path.join(__dirname, '..', 'dist', 'index.html');
  }
  return path.join(__dirname, '..', 'dist', 'index.html');
}

function startHttpServer(port) {
  const distPath = app.isPackaged 
    ? path.join(__dirname, '..', 'dist')
    : path.join(__dirname, '..', 'dist');
  
  const mimeTypes = {
    '.html': 'text/html',
    '.js': 'application/javascript',
    '.css': 'text/css',
    '.json': 'application/json',
    '.png': 'image/png',
    '.jpg': 'image/jpeg',
    '.jpeg': 'image/jpeg',
    '.gif': 'image/gif',
    '.svg': 'image/svg+xml',
    '.ico': 'image/x-icon',
    '.woff': 'font/woff',
    '.woff2': 'font/woff2',
    '.ttf': 'font/ttf',
    '.eot': 'application/vnd.ms-fontobject',
  };

  const server = http.createServer((req, res) => {
    let filePath = path.join(distPath, req.url === '/' ? 'index.html' : req.url);
    
    const ext = path.extname(filePath);
    const contentType = mimeTypes[ext] || 'application/octet-stream';

    fs.readFile(filePath, (err, content) => {
      if (err) {
        if (err.code === 'ENOENT') {
          fs.readFile(path.join(distPath, 'index.html'), (err2, content2) => {
            if (err2) {
              res.writeHead(404);
              res.end('Not Found');
            } else {
              res.writeHead(200, { 'Content-Type': 'text/html' });
              res.end(content2);
            }
          });
        } else {
          res.writeHead(500);
          res.end('Server Error');
        }
      } else {
        res.writeHead(200, { 'Content-Type': contentType });
        res.end(content);
      }
    });
  });

  server.listen(port, '0.0.0.0', () => {
    log(`HTTP server running at http://localhost:${port}/`);
  });

  return server;
}

function createWindow() {
  const indexPath = getIndexPath();
  log('Creating window, indexPath:', indexPath);
  log('__dirname:', __dirname);
  log('dist exists:', fs.existsSync(path.join(__dirname, '..', 'dist')));
  log('index.html exists:', fs.existsSync(indexPath));
  
  mainWindow = new BrowserWindow({
    show: false,
    width: 1200,
    height: 800,
    webPreferences: {
      preload: path.join(__dirname, 'preload.cjs'),
      contextIsolation: true,
      nodeIntegration: false,
      devTools: !app.isPackaged,
    },
  });
  
  if (argsGlobal.port) {
    mainWindow.loadURL(`http://localhost:${argsGlobal.port}/`);
  } else {
    mainWindow.loadFile(indexPath);
  }
  
  mainWindow.on('ready-to-show', () => {
    if (!argsGlobal.headless) {
      mainWindow.show();
    }
  });
  
  mainWindow.webContents.on('did-fail-load', (_event, errorCode, errorDesc) => {
    log('FAIL LOAD:', errorCode, errorDesc);
  });
  
  mainWindow.webContents.on('did-finish-load', () => {
    log('Page finished loading');
  });
  
  if (!app.isPackaged && !argsGlobal.headless) {
    mainWindow.webContents.openDevTools();
  }

  mainWindow.on('closed', () => {
    mainWindow = null;
  });
}

ipcMain.handle('list-docs-files', (_event, basePath) => {
  const docsPath = path.join(basePath, 'api');
  if (!fs.existsSync(docsPath)) {
    return [];
  }
  
  const result = [];
  
  function walkDir(dir, baseDir) {
    const entries = fs.readdirSync(dir, { withFileTypes: true });
    for (const entry of entries) {
      const fullPath = path.join(dir, entry.name);
      if (entry.isDirectory()) {
        walkDir(fullPath, baseDir);
      } else if (entry.name.endsWith('.md')) {
        const relativePath = path.relative(baseDir, fullPath);
        result.push({
          name: entry.name.replace('.md', ''),
          path: fullPath,
          relativePath: relativePath.replace(/\\/g, '/')
        });
      }
    }
  }
  
  walkDir(docsPath, docsPath);
  return result;
});

ipcMain.handle('read-doc-file', (_event, filePath) => {
  if (!fs.existsSync(filePath)) {
    return null;
  }
  return fs.readFileSync(filePath, 'utf-8');
});

ipcMain.on('renderer-log', (_event, level, ...args) => {
  log(`[renderer][${level}]`, ...args);
});

app.whenReady().then(() => {
  log('App ready, parsing args:', argsGlobal);
  
  if (argsGlobal.port) {
    log('Starting HTTP server on port', argsGlobal.port);
    httpServer = startHttpServer(argsGlobal.port);
  }
  
  createWindow();
  
  app.on('activate', () => {
    if (BrowserWindow.getAllWindows().length === 0) {
      createWindow();
    }
  });
}).catch(err => {
  log('FATAL ERROR:', err);
  process.exit(1);
});

app.on('window-all-closed', () => {
  if (httpServer) {
    httpServer.close();
  }
  if (argsGlobal.headless) {
    log('Headless mode: window closed, keeping process alive for 5 seconds...');
    setTimeout(() => {
      log('Headless mode: exiting now');
      process.exit(0);
    }, 5000);
  } else if (process.platform !== 'darwin') {
    app.quit();
  }
});

process.on('uncaughtException', (err) => {
  log('Uncaught exception:', err);
});

process.on('unhandledRejection', (reason) => {
  log('Unhandled rejection:', reason);
});