package com.trafficaudit.security.controller;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.trafficaudit.common.Result;
import com.trafficaudit.security.captcha.CaptchaService;
import com.trafficaudit.security.utils.JwtUtils;
import com.trafficaudit.system.entity.User;
import com.trafficaudit.system.mapper.UserMapper;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.web.bind.annotation.*;

import org.springframework.beans.factory.annotation.Value;
import javax.annotation.Resource;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@RestController
@RequestMapping("/api/auth")
public class LoginController {

    @Resource
    private JwtUtils jwtUtils;

    @Resource
    private CaptchaService captchaService;

    @Resource
    private UserMapper userMapper;

    @Resource
    private PasswordEncoder passwordEncoder;

    @Value("${app.captcha.required:true}")
    private boolean captchaRequired;

    @PostMapping("/login")
    public Result<Map<String, Object>> login(@RequestBody Map<String, Object> params) {
        String username = (String) params.get("username");
        String password = (String) params.get("password");
        String captchaId = (String) params.get("captchaId");
        List<String> clickIds = strList(params.get("captchaClickIds"));

        if (captchaRequired) {
            CaptchaService.ConsumeResult cr = captchaService.consume(captchaId, clickIds);
            if (cr == CaptchaService.ConsumeResult.NOT_FOUND) {
                return Result.error(4002, "验证码不存在或已过期，请刷新重试");
            }
            if (cr == CaptchaService.ConsumeResult.NOT_VERIFIED) {
                return Result.error(4003, "请先完成行为验证");
            }
            if (cr == CaptchaService.ConsumeResult.WRONG) {
                return Result.error(4001, "行为验证未通过，请重新验证");
            }
        }

        if (username == null || username.trim().isEmpty() || password == null || password.isEmpty()) {
            return Result.error(401, "用户名或密码错误");
        }
        User user = userMapper.selectOne(new LambdaQueryWrapper<User>()
                .eq(User::getUsername, username.trim()));
        if (user == null || !Integer.valueOf(1).equals(user.getStatus())) {
            return Result.error(401, "用户名或密码错误");
        }
        String encoded = user.getPassword();
        boolean ok;
        try {
            ok = encoded != null && passwordEncoder.matches(password, encoded);
        } catch (IllegalArgumentException e) {
            // 库中密码不是合法 BCrypt 时回退为明文对比（避免旧数据无法登录）
            ok = encoded != null && encoded.equals(password);
        }
        if (!ok) {
            return Result.error(401, "用户名或密码错误");
        }
        String token = jwtUtils.generateToken(username.trim());
        Map<String, Object> data = new HashMap<>();
        data.put("token", token);
        data.put("username", username.trim());
        data.put("realName", user.getRealName());
        data.put("modules", user.getModules() == null ? "" : user.getModules());
        return Result.ok(data);
    }

    /** 用户修改自己的密码：需提供原密码，新密码至少 6 位 */
    @PostMapping("/change-password")
    public Result<Void> changePassword(@RequestHeader(value = "Authorization", required = false) String auth,
                                       @RequestBody Map<String, Object> params) {
        String username = jwtUtils.resolveUsername(auth);
        if (username == null) {
            return Result.error(401, "未登录或登录已过期");
        }
        String oldPassword = (String) params.get("oldPassword");
        String newPassword = (String) params.get("newPassword");
        if (oldPassword == null || oldPassword.isEmpty()) {
            return Result.error(400, "请输入原密码");
        }
        if (newPassword == null || newPassword.length() < 6) {
            return Result.error(400, "新密码长度不能少于 6 位");
        }
        if (newPassword.equals(oldPassword)) {
            return Result.error(400, "新密码不能与原密码相同");
        }
        User user = userMapper.selectOne(new LambdaQueryWrapper<User>().eq(User::getUsername, username));
        if (user == null) {
            return Result.error(404, "用户不存在");
        }
        String encoded = user.getPassword();
        boolean ok;
        try {
            ok = encoded != null && passwordEncoder.matches(oldPassword, encoded);
        } catch (IllegalArgumentException e) {
            // 库中密码不是合法 BCrypt 时回退为明文对比（与登录一致）
            ok = encoded != null && encoded.equals(oldPassword);
        }
        if (!ok) {
            return Result.error(400, "原密码错误");
        }
        user.setPassword(passwordEncoder.encode(newPassword));
        userMapper.updateById(user);
        return Result.ok(null);
    }

    @GetMapping("/captcha-config")
    public Result<Map<String, Object>> captchaConfig() {
        Map<String, Object> data = new HashMap<>();
        data.put("required", captchaRequired);
        return Result.ok(data);
    }

    @SuppressWarnings("unchecked")
    private List<String> strList(Object o) {
        if (o instanceof List) {
            return (List<String>) o;
        }
        return Collections.emptyList();
    }
}