import { spawn, ChildProcess, execSync } from 'child_process';
import { resolve, dirname } from 'path';
import { fileURLToPath } from 'url';

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

const ROOT_DIR = resolve(__dirname, '..');
const SERVER_DIR = resolve(ROOT_DIR, 'server');
const CLIENT_DIR = resolve(ROOT_DIR, 'client');

export interface ServerProcesses {
  backend: ChildProcess | null;
  frontend: ChildProcess | null;
}

let processes: ServerProcesses = {
  backend: null,
  frontend: null,
};

function waitForServer(url: string, timeout = 30000): Promise<void> {
  const start = Date.now();
  // Allow self-signed certificates for HTTPS
  const originalTlsReject = process.env.NODE_TLS_REJECT_UNAUTHORIZED;
  if (url.startsWith('https://')) {
    process.env.NODE_TLS_REJECT_UNAUTHORIZED = '0';
  }
  return new Promise((resolve, reject) => {
    const cleanup = () => {
      if (originalTlsReject !== undefined) {
        process.env.NODE_TLS_REJECT_UNAUTHORIZED = originalTlsReject;
      } else {
        delete process.env.NODE_TLS_REJECT_UNAUTHORIZED;
      }
    };
    const check = async () => {
      try {
        const controller = new AbortController();
        const timeoutId = setTimeout(() => controller.abort(), 2000);
        const response = await fetch(url, { signal: controller.signal });
        clearTimeout(timeoutId);
        if (response.ok) {
          // Add small delay to ensure server is fully ready
          await new Promise((r) => setTimeout(r, 500));
          cleanup();
          resolve();
          return;
        }
      } catch {
        // Server not ready yet
      }

      if (Date.now() - start > timeout) {
        cleanup();
        reject(new Error(`Server at ${url} did not start within ${timeout}ms`));
        return;
      }

      setTimeout(check, 500);
    };
    check();
  });
}

export async function startBackend(port = 3000): Promise<ChildProcess> {
  console.log('Starting backend server...');

  // Use a test database to avoid polluting the main one
  const testDbPath = resolve(SERVER_DIR, 'test-e2e.db');

  // Remove old test database
  try {
    execSync(`rm -f ${testDbPath}`);
  } catch {
    // Ignore if doesn't exist
  }

  const backend = spawn('clj', ['-M:run'], {
    cwd: SERVER_DIR,
    env: {
      ...process.env,
      SPICEFLOW_PORT: String(port),
      SPICEFLOW_DB: testDbPath,
    },
    stdio: ['pipe', 'pipe', 'pipe'],
  });

  backend.stdout?.on('data', (data) => {
    console.log(`[backend] ${data.toString().trim()}`);
  });

  backend.stderr?.on('data', (data) => {
    console.error(`[backend] ${data.toString().trim()}`);
  });

  processes.backend = backend;

  await waitForServer(`http://localhost:${port}/api/health`);
  console.log('Backend server ready');

  return backend;
}

export async function startFrontend(port = 5173, backendPort = 3000): Promise<ChildProcess> {
  console.log('Starting frontend server...');

  const frontend = spawn('npm', ['run', 'dev', '--', '--port', String(port)], {
    cwd: CLIENT_DIR,
    env: {
      ...process.env,
      VITE_BACKEND_PORT: String(backendPort),
    },
    stdio: ['pipe', 'pipe', 'pipe'],
  });

  frontend.stdout?.on('data', (data) => {
    console.log(`[frontend] ${data.toString().trim()}`);
  });

  frontend.stderr?.on('data', (data) => {
    console.error(`[frontend] ${data.toString().trim()}`);
  });

  processes.frontend = frontend;

  await waitForServer(`https://localhost:${port}`);
  console.log('Frontend server ready');

  return frontend;
}

export async function startServers(backendPort = 3000, frontendPort = 5173): Promise<ServerProcesses> {
  await startBackend(backendPort);
  await startFrontend(frontendPort, backendPort);
  return processes;
}

export function stopServers(): void {
  console.log('Stopping servers...');

  if (processes.frontend) {
    processes.frontend.kill('SIGTERM');
    processes.frontend = null;
  }

  if (processes.backend) {
    processes.backend.kill('SIGTERM');
    processes.backend = null;
  }

  console.log('Servers stopped');
}

export function getProcesses(): ServerProcesses {
  return processes;
}