package com.agileboot.admin.customize.config;

import cn.hutool.json.JSONUtil;
import com.agileboot.admin.customize.service.login.LoginService;
import com.agileboot.common.core.dto.ResponseDTO;
import com.agileboot.common.exception.ApiException;
import com.agileboot.common.exception.error.ErrorCode.Client;
import com.agileboot.common.utils.ServletHolderUtil;
import com.agileboot.domain.common.cache.RedisCacheService;
import com.agileboot.admin.customize.async.AsyncTaskFactory;
import com.agileboot.infrastructure.thread.ThreadPoolManager;
import com.agileboot.infrastructure.user.web.SystemLoginUser;
import com.agileboot.admin.customize.service.login.TokenService;
import com.agileboot.common.enums.common.LoginStatusEnum;
import lombok.RequiredArgsConstructor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpMethod;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.config.annotation.authentication.builders.AuthenticationManagerBuilder;
import org.springframework.security.config.annotation.method.configuration.EnableGlobalMethodSecurity;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.http.SessionCreationPolicy;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.web.AuthenticationEntryPoint;
import org.springframework.security.web.SecurityFilterChain;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
import org.springframework.security.web.authentication.logout.LogoutFilter;
import org.springframework.security.web.authentication.logout.LogoutSuccessHandler;
import org.springframework.web.filter.CorsFilter;

/**
 * 主要配置登录流程逻辑涉及以下几个类
 * @see UserDetailsServiceImpl#loadUserByUsername  用于登录流程通过用户名加载用户
 * @see this#unauthorizedHandler()  用于用户未授权或登录失败处理
 * @see this#logOutSuccessHandler 用于退出登录成功后的逻辑
 * @see JwtAuthenticationTokenFilter#doFilter token的校验和刷新
 * @see LoginService#login 登录逻辑
 * @author valarchie
 */
@Configuration
@EnableWebSecurity
@EnableGlobalMethodSecurity(prePostEnabled = true)
@RequiredArgsConstructor
public class SecurityConfig {

    private final TokenService tokenService;

    private final RedisCacheService redisCache;

    /**
     * token认证过滤器
     */
    private final JwtAuthenticationTokenFilter jwtTokenFilter;

    private final UserDetailsService userDetailsService;

    /**
     * 跨域过滤器
     */
    private final CorsFilter corsFilter;


    /**
     * 登录异常处理类
     * 用户未登陆的话  在这个Bean中处理
     */
    @Bean
    public AuthenticationEntryPoint unauthorizedHandler() {
        return (request, response, exception) -> {
            ResponseDTO<Object> responseDTO = ResponseDTO.fail(
                new ApiException(Client.COMMON_NO_AUTHORIZATION, request.getRequestURI())
            );
            ServletHolderUtil.renderString(response, JSONUtil.toJsonStr(responseDTO));
        };
    }


    /**
     *  退出成功处理类 返回成功
     *  在SecurityConfig类当中 定义了/logout 路径对应处理逻辑
     */
    @Bean
    public LogoutSuccessHandler logOutSuccessHandler() {
        return (request, response, authentication) -> {
            SystemLoginUser loginUser = tokenService.getLoginUser(request);
            if (loginUser != null) {
                String userName = loginUser.getUsername();
                // 删除用户缓存记录
                redisCache.loginUserCache.delete(loginUser.getCachedKey());
                // 记录用户退出日志
                ThreadPoolManager.execute(AsyncTaskFactory.loginInfoTask(
                    userName, LoginStatusEnum.LOGOUT, LoginStatusEnum.LOGOUT.description()));
            }
            ServletHolderUtil.renderString(response, JSONUtil.toJsonStr(ResponseDTO.ok()));
        };
    }

    /**
     * 强散列哈希加密实现
     */
    @Bean
    public BCryptPasswordEncoder bCryptPasswordEncoder() {
        return new BCryptPasswordEncoder();
    }


    /**
     * 鉴权管理类
     * @see UserDetailsServiceImpl#loadUserByUsername
     */
    @Bean
    public AuthenticationManager authManager(HttpSecurity http) throws Exception {
        return http.getSharedObject(AuthenticationManagerBuilder.class)
            .userDetailsService(userDetailsService)
            .passwordEncoder(bCryptPasswordEncoder())
            .and()
            .build();
    }


    @Bean
    public SecurityFilterChain filterChain(HttpSecurity httpSecurity) throws Exception {
        httpSecurity
            // CSRF禁用，因为不使用session
            .csrf().disable()
            // 认证失败处理类
            .exceptionHandling().authenticationEntryPoint(unauthorizedHandler()).and()
            // 基于token，所以不需要session
            .sessionManagement().sessionCreationPolicy(SessionCreationPolicy.STATELESS).and()
            // 过滤请求
            .authorizeRequests()
            // 对于登录login 注册register 验证码captchaImage 以及公共Api的请求允许匿名访问
            // 注意： 当携带token请求以下这几个接口时 会返回403的错误
            .antMatchers("/login", "/register", "/getConfig", "/captchaImage", "/api/**").anonymous()
            .antMatchers("/app/login", "/app/register", "/app/getConfig", "/app/captchaImage").anonymous()
            .antMatchers(HttpMethod.GET, "/", "/*.html", "/**/*.html", "/**/*.css", "/**/*.js",
                "/profile/**").permitAll()
            // TODO this is danger.
            .antMatchers("/swagger-ui.html").anonymous()
            .antMatchers("/swagger-resources/**").anonymous()
            .antMatchers("/webjars/**").anonymous()
            .antMatchers("/*/api-docs","/*/api-docs/swagger-config").anonymous()
            .antMatchers("/**/api-docs.yaml" ).anonymous()
            .antMatchers("/druid/**").anonymous()
            // 除上面外的所有请求全部需要鉴权认证
            .anyRequest().authenticated()
            .and()
            // 禁用 X-Frame-Options 响应头。下面是具体解释：
            // X-Frame-Options 是一个 HTTP 响应头，用于防止网页被嵌入到其他网页的 <frame>、<iframe> 或 <object> 标签中，从而可以减少点击劫持攻击的风险
            .headers().frameOptions().disable();
        httpSecurity.logout().logoutUrl("/logout").logoutSuccessHandler(logOutSuccessHandler());
        // 添加JWT filter   需要一开始就通过token识别出登录用户 并放到上下文中   所以jwtFilter需要放前面
        httpSecurity.addFilterBefore(jwtTokenFilter, UsernamePasswordAuthenticationFilter.class);
        // 添加CORS filter
        httpSecurity.addFilterBefore(corsFilter, JwtAuthenticationTokenFilter.class);
        httpSecurity.addFilterBefore(corsFilter, LogoutFilter.class);

        return httpSecurity.build();
    }


}
