<?php
declare(strict_types=1);

namespace App\Service;

use Fendx\Core\Annotation\Service;
use Fendx\Core\Annotation\Inject;
use Fendx\Db\Annotation\Transactional;
use Fendx\Cache\Annotation\Cacheable;
use Fendx\Cache\Annotation\CacheUpdate;
use Fendx\Cache\Annotation\CacheEvict;
use App\Dao\UserDao;
use App\Entity\User;
use Fendx\Web\Validator\Validator;
use Fendx\Common\Exception\BusinessException;

#[Service]
class UserService
{
    #[Inject]
    private UserDao $userDao;

    #[Cacheable(key: "user:{id}", ttl: 3600)]
    public function getUser(int $id): ?User
    {
        return $this->userDao->findById($id);
    }

    public function getUserByEmail(string $email): ?User
    {
        return $this->userDao->findByEmail($email);
    }

    public function getUserByUsername(string $username): ?User
    {
        return $this->userDao->findByUsername($username);
    }

    #[Cacheable(key: "users:active", ttl: 1800)]
    public function getActiveUsers(): array
    {
        return $this->userDao->findAllActive();
    }

    public function getUsersPaginated(int $page = 1, int $pageSize = 10): array
    {
        return $this->userDao->findPaginated($page, $pageSize);
    }

    #[Transactional]
    #[CacheUpdate(key: "user:{id}")]
    public function createUser(array $data): User
    {
        // 验证数据
        $this->validateUserData($data);
        
        // 检查邮箱和用户名是否已存在
        if ($this->userDao->findByEmail($data['email'])) {
            throw new BusinessException(400, 'Email already exists');
        }
        
        if ($this->userDao->findByUsername($data['username'])) {
            throw new BusinessException(400, 'Username already exists');
        }
        
        // 加密密码
        $data['password'] = password_hash($data['password'], PASSWORD_DEFAULT);
        
        return $this->userDao->create($data);
    }

    #[Transactional]
    #[CacheUpdate(key: "user:{id}")]
    public function updateUser(int $id, array $data): bool
    {
        $user = $this->userDao->findById($id);
        if (!$user) {
            throw new BusinessException(404, 'User not found');
        }

        // 如果更新邮箱，检查是否已存在
        if (isset($data['email']) && $data['email'] !== $user->email) {
            if ($this->userDao->findByEmail($data['email'])) {
                throw new BusinessException(400, 'Email already exists');
            }
        }

        // 如果更新用户名，检查是否已存在
        if (isset($data['username']) && $data['username'] !== $user->username) {
            if ($this->userDao->findByUsername($data['username'])) {
                throw new BusinessException(400, 'Username already exists');
            }
        }

        // 如果更新密码，需要加密
        if (isset($data['password'])) {
            $data['password'] = password_hash($data['password'], PASSWORD_DEFAULT);
        }

        return $this->userDao->update($id, $data);
    }

    #[Transactional]
    #[CacheEvict(key: "user:{id}")]
    public function deleteUser(int $id): bool
    {
        $user = $this->userDao->findById($id);
        if (!$user) {
            throw new BusinessException(404, 'User not found');
        }

        return $this->userDao->delete($id);
    }

    public function searchUsers(string $keyword, int $page = 1, int $pageSize = 10): array
    {
        return $this->userDao->search($keyword, $page, $pageSize);
    }

    public function getUsersCount(): int
    {
        return $this->userDao->count();
    }

    public function getActiveUsersCount(): int
    {
        return $this->userDao->countActive();
    }

    public function validatePassword(string $password, string $hash): bool
    {
        return password_verify($password, $hash);
    }

    public function changePassword(int $userId, string $oldPassword, string $newPassword): bool
    {
        $user = $this->userDao->findById($userId);
        if (!$user) {
            throw new BusinessException(404, 'User not found');
        }

        if (!$this->validatePassword($oldPassword, $user->password)) {
            throw new BusinessException(400, 'Invalid old password');
        }

        return $this->updateUser($userId, ['password' => $newPassword]);
    }

    public function toggleUserStatus(int $id): bool
    {
        $user = $this->userDao->findById($id);
        if (!$user) {
            throw new BusinessException(404, 'User not found');
        }

        $newStatus = $user->status === 1 ? 0 : 1;
        
        return $this->updateUser($id, ['status' => $newStatus]);
    }

    private function validateUserData(array $data): void
    {
        $validator = Validator::make($data, [
            'username' => 'required|min:3|max:50',
            'email' => 'required|email',
            'password' => 'required|min:6'
        ]);

        if (!$validator->validate()) {
            throw new BusinessException(422, 'Validation failed', $validator->errors());
        }
    }

    public function validateUserUpdateData(array $data): void
    {
        $rules = [];
        
        if (isset($data['username'])) {
            $rules['username'] = 'required|min:3|max:50';
        }
        
        if (isset($data['email'])) {
            $rules['email'] = 'required|email';
        }
        
        if (isset($data['password'])) {
            $rules['password'] = 'required|min:6';
        }

        if (!empty($rules)) {
            $validator = Validator::make($data, $rules);
            
            if (!$validator->validate()) {
                throw new BusinessException(422, 'Validation failed', $validator->errors());
            }
        }
    }
}