package com.ruoyi.framework.web.service;

import javax.annotation.Resource;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.BadCredentialsException;
import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.stereotype.Component;
import com.ruoyi.common.constant.CacheConstants;
import com.ruoyi.common.constant.Constants;
import com.ruoyi.common.constant.UserConstants;
import com.ruoyi.common.core.domain.entity.SysUser;
import com.ruoyi.common.core.domain.model.LoginUser;
import com.ruoyi.common.core.redis.RedisCache;
import com.ruoyi.common.exception.ServiceException;
import com.ruoyi.common.exception.user.BlackListException;
import com.ruoyi.common.exception.user.CaptchaException;
import com.ruoyi.common.exception.user.CaptchaExpireException;
import com.ruoyi.common.exception.user.UserNotExistsException;
import com.ruoyi.common.exception.user.UserPasswordNotMatchException;
import com.ruoyi.common.utils.DateUtils;
import com.ruoyi.common.utils.MessageUtils;
import com.ruoyi.common.utils.StringUtils;
import com.ruoyi.common.utils.ip.IpUtils;
import com.ruoyi.framework.config.properties.LoginProperties;
import com.ruoyi.framework.manager.AsyncManager;
import com.ruoyi.framework.manager.factory.AsyncFactory;
import com.ruoyi.framework.security.context.AuthenticationContextHolder;
import com.ruoyi.system.service.ISysConfigService;
import com.ruoyi.system.service.ISysUserService;

/**
 * 登录校验方法
 * <p>
 * 若依默认口令登录流程；密码改造一期在互联网管理端增加短信双因子：
 * 当 {@link LoginSmsService#requiresSmsTwoFactor} 为 true 时，须在口令认证前校验 {@code smsCode}。
 * {@code login.auth-mode=sms-2fa} 时以短信 OTP 代替图形验证码，不再校验图片验证码。
 * </p>
 * 
 * @author ruoyi
 */
@Component
public class SysLoginService
{
    @Autowired
    private TokenService tokenService;

    @Resource
    private AuthenticationManager authenticationManager;

    @Autowired
    private RedisCache redisCache;
    
    @Autowired
    private ISysUserService userService;

    @Autowired
    private ISysConfigService configService;

    @Autowired
    private LoginProperties loginProperties;

    @Autowired
    private LoginSmsService loginSmsService;

    /**
     * 登录验证（兼容旧调用，不传短信码）。
     * 
     * @param username 用户名
     * @param password 密码
     * @param code 图形验证码
     * @param uuid 图形验证码唯一标识
     * @return JWT Token
     */
    public String login(String username, String password, String code, String uuid)
    {
        return login(username, password, code, uuid, null);
    }

    /**
     * 登录验证（支持互联网短信双因子）。
     * <p>
     * 完整顺序：图形验证码（非 sms-2fa）→ 用户名/密码格式与黑名单 → <b>短信 OTP（若策略要求）</b>
     * → Spring Security 口令认证 → 签发 Token。
     * {@code smsCode} 对非双因子用户可省略；双因子用户缺失或错误将在口令校验前被拒绝并记登录失败审计。
     * </p>
     *
     * @param smsCode 短信验证码，互联网双因子场景必填；内网/口令策略可为 null
     */
    public String login(String username, String password, String code, String uuid, String smsCode)
    {
        // sms-2fa 以短信 OTP 代替图形验证码
        if (!loginProperties.isSmsTwoFactorActive())
        {
            validateCaptcha(username, code, uuid);
        }
        // 登录前置校验
        loginPreCheck(username, password);

        // 密码改造一期：互联网双因子 — 在口令认证前校验短信 OTP
        SysUser loginUserEntity = userService.selectUserByUserName(username);
        if (loginUserEntity != null && loginSmsService.requiresSmsTwoFactor(loginUserEntity))
        {
            loginSmsService.validateLoginSmsCode(loginUserEntity, smsCode);
        }

        // 用户验证
        Authentication authentication = null;
        try
        {
            UsernamePasswordAuthenticationToken authenticationToken = new UsernamePasswordAuthenticationToken(username, password);
            AuthenticationContextHolder.setContext(authenticationToken);
            // 该方法会去调用UserDetailsServiceImpl.loadUserByUsername
            authentication = authenticationManager.authenticate(authenticationToken);
        }
        catch (Exception e)
        {
            if (e instanceof BadCredentialsException)
            {
                AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_FAIL, MessageUtils.message("user.password.not.match")));
                throw new UserPasswordNotMatchException();
            }
            else
            {
                AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_FAIL, e.getMessage()));
                throw new ServiceException(e.getMessage());
            }
        }
        finally
        {
            AuthenticationContextHolder.clearContext();
        }
        AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_SUCCESS, MessageUtils.message("user.login.success")));
        LoginUser loginUser = (LoginUser) authentication.getPrincipal();
        recordLoginInfo(loginUser.getUserId());
        // 生成token
        return tokenService.createToken(loginUser);
    }

    /**
     * 校验图形验证码。
     * <p>
     * 登录与短信发送共用此方法；验证码一次性使用（校验后删 Redis）。
     * sms-2fa 登录流程不再调用本方法。
     * </p>
     * 
     * @param username 用户名（仅用于记登录失败日志）
     * @param code 用户输入的验证码
     * @param uuid 获取验证码时返回的唯一标识
     */
    public void validateCaptcha(String username, String code, String uuid)
    {
        boolean captchaEnabled = configService.selectCaptchaEnabled();
        if (captchaEnabled)
        {
            String verifyKey = CacheConstants.CAPTCHA_CODE_KEY + StringUtils.nvl(uuid, "");
            String captcha = redisCache.getCacheObject(verifyKey);
            if (captcha == null)
            {
                AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_FAIL, MessageUtils.message("user.jcaptcha.expire")));
                throw new CaptchaExpireException();
            }
            redisCache.deleteObject(verifyKey);
            if (!code.equalsIgnoreCase(captcha))
            {
                AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_FAIL, MessageUtils.message("user.jcaptcha.error")));
                throw new CaptchaException();
            }
        }
    }

    /**
     * 登录前置校验
     * @param username 用户名
     * @param password 用户密码
     */
    public void loginPreCheck(String username, String password)
    {
        // 用户名或密码为空 错误
        if (StringUtils.isEmpty(username) || StringUtils.isEmpty(password))
        {
            AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_FAIL, MessageUtils.message("not.null")));
            throw new UserNotExistsException();
        }
        // 密码如果不在指定范围内 错误
        if (password.length() < UserConstants.PASSWORD_MIN_LENGTH
                || password.length() > UserConstants.PASSWORD_MAX_LENGTH)
        {
            AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_FAIL, MessageUtils.message("user.password.not.match")));
            throw new UserPasswordNotMatchException();
        }
        // 用户名不在指定范围内 错误
        if (username.length() < UserConstants.USERNAME_MIN_LENGTH
                || username.length() > UserConstants.USERNAME_MAX_LENGTH)
        {
            AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_FAIL, MessageUtils.message("user.password.not.match")));
            throw new UserPasswordNotMatchException();
        }
        // IP黑名单校验
        String blackStr = configService.selectConfigByKey("sys.login.blackIPList");
        if (IpUtils.isMatchedIp(blackStr, IpUtils.getIpAddr()))
        {
            AsyncManager.me().execute(AsyncFactory.recordLogininfor(username, Constants.LOGIN_FAIL, MessageUtils.message("login.blocked")));
            throw new BlackListException();
        }
    }

    /**
     * 记录登录信息
     *
     * @param userId 用户ID
     */
    public void recordLoginInfo(Long userId)
    {
        userService.updateLoginInfo(userId, IpUtils.getIpAddr(), DateUtils.getNowDate());
    }
}
