package com.onekeycall.videotablet.service;

import com.onekeycall.videotablet.entity.User;
import com.onekeycall.videotablet.repository.UserRepository;
import com.onekeycall.videotablet.result.Result;
import com.onekeycall.videotablet.utils.SecureIdGenerator;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.security.core.userdetails.UserDetails;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.stereotype.Service;

import java.util.Date;
import java.util.Map;

@Service
public class UserService implements UserDetailsService {

    private final UserRepository userRepository;
    private final PasswordEncoder passwordEncoder;
    private final RedisTemplate<String, Object> redisTemplate;

    @Autowired
    public UserService(UserRepository userRepository, PasswordEncoder passwordEncoder, RedisTemplate<String, Object> redisTemplate) {
        this.userRepository = userRepository;
        this.passwordEncoder = passwordEncoder;
        this.redisTemplate = redisTemplate;
    }

    public User getUserByPhone(String phone) {
        return userRepository.findUserByPhone(phone).orElseThrow(() -> new RuntimeException("User not found with phone: " + phone));
    }

    public User registerUser(String userId, String password) {
        if (userRepository.existsByUserId(userId)) {
            throw new RuntimeException("Username already exists");
        }

        User user = new User();
        user.setUsername(userId);
        user.setPassword(passwordEncoder.encode(password));

        return userRepository.save(user);
    }

    public User registerByPhone(String phone, String code, String deviceId, Date createTime) {
        // 1. 验证验证码
        Map<String, Object> codeMap = (Map<String, Object>) redisTemplate.opsForValue().get(phone);
        if (codeMap == null || !code.equals(codeMap.get("code").toString())) {
            throw new RuntimeException("Invalid verification code");
        }

        // 2. 检查手机号是否已注册
        if (userRepository.existsByPhone(phone)) {
            User user = userRepository.findByPhone(phone).get();
            user.setNewUser(false);
            return user;
        } else {
            // 3. 创建新用户
            User user = new User();
            user.setNewUser(true);
            user.setPhone(phone);
            user.setCreatTime(createTime);
            user.setLastLoginTime(createTime);
            user.setUpdateTime(createTime);
            user.setUserId(SecureIdGenerator.generateSecureId(12));
            user.setUsername(SecureIdGenerator.generateSecureUserName(8));
            user.setDeviceId(deviceId);

            return userRepository.save(user);
        }
    }

    public User loginByPhone(String phone, String code) {
        // 1. 验证验证码
        Map<String, Object> codeMap = (Map<String, Object>) redisTemplate.opsForValue().get(phone);
        if (codeMap == null || !code.equals(codeMap.get("code").toString())) {
            throw new RuntimeException("Invalid verification code");
        }

        // 2. 查询用户
        return userRepository.findByPhone(phone)
                .orElseThrow(() -> new RuntimeException("User not found with phone: " + phone));
    }

    @Override
    public UserDetails loadUserByUsername(String userId) throws UsernameNotFoundException {
        return userRepository.findByUserId(userId)
                .orElseThrow(() -> new UsernameNotFoundException("User not found with userId: " + userId));
    }

    public void setPasswordByUserId(String userId, String password) {
        User user = userRepository.findByUserId(userId)
                .orElseThrow(() -> new UsernameNotFoundException("User not found with userId: " + userId));
        user.setPassword(passwordEncoder.encode(password));
        userRepository.save(user);
    }

    public Result changePassword(String userId, String oldPassword, String newPassword) {
        User user = userRepository.findByUserId(userId)
                .orElseThrow(() -> new UsernameNotFoundException("User not found with userId: " + userId));
        if (!passwordEncoder.matches(oldPassword, user.getPassword())) {
            return Result.error().message("Old password is incorrect");
        } else {
            user.setPassword(passwordEncoder.encode(newPassword));
            userRepository.save(user);
            return Result.ok().message("change password success");
        }
    }

    public User getUserByUserId(String userId) {
        return userRepository.findUserByUserId(userId).orElseThrow(() -> new RuntimeException("User not found with userId: " + userId));
    }
}