/**
 * Auth Routes – Registration, Login, Logout, Profile
 */
import type { FastifyInstance } from 'fastify';
import type { AuthService } from '../auth/AuthService.js';

export function registerAuthRoutes(fastify: FastifyInstance, authService: AuthService) {
  // Register new user
  fastify.post('/api/auth/register', async (request, reply) => {
    const { email, password, name, role } = request.body as {
      email?: string; password?: string; name?: string; role?: string;
    };
    if (!email || !password || !name) {
      return reply.code(400).send({ error: 'Email, password and name are required' });
    }
    try {
      const result = await authService.register(email, password, name, role);
      return reply.code(201).send(result);
    } catch (err: any) {     return reply.code(409).send({ error: err.message });
    }
  });

  // Login
  fastify.post('/api/auth/login', async (request, reply) => {
    const { email, password } = request.body as { email?: string; password?: string };
    if (!email || !password) {
      return reply.code(400).send({ error: 'Email and password are required' });
    }
    try {
      const result = await authService.login(email, password);
      return reply.send(result);
    } catch {
      return reply.code(401).send({ error: 'Invalid credentials' });
    }
  });

  // Logout
  fastify.post('/api/auth/logout', async (request, reply) => {
    const token = extractToken(request);
    if (token) {
      authService.destroySession(token);
    }
    return reply.code(204).send();
  });

  // Get current user profile
  fastify.get('/api/auth/me', async (request, reply) => {
    const token = extractToken(request);
    if (!token) return reply.code(401).send({ error: 'Not authenticated' });
    const user = authService.getUserFromSession(token);
    if (!user) return reply.code(401).send({ error: 'Invalid or expired session' });
    const { password_hash, ...safe } = user;
    return safe;
  });

  // Change password
  fastify.patch('/api/auth/password', async (request, reply) => {
    const token = extractToken(request);
    if (!token) return reply.code(401).send({ error: 'Not authenticated' });
    const user = authService.getUserFromSession(token);
    if (!user) return reply.code(401).send({ error: 'Invalid or expired session' });

    const { oldPassword, newPassword } = request.body as { oldPassword?: string; newPassword?: string };
    if (!oldPassword || !newPassword) {
      return reply.code(400).send({ error: 'oldPassword and newPassword are required' });
    }
    try {
      await authService.changePassword(user.id, oldPassword, newPassword);
      return reply.code(204).send();
    } catch (err: any) {
      return reply.code(400).send({ error: err.message });
    }
  });
}

function extractToken(request: any): string | null {
  const auth = request.headers?.authorization;
  if (auth && auth.startsWith('Bearer ')) {
    return auth.slice(7);
  }
  return null;
}