package com.backendsys.config.Security;

import com.backendsys.entity.System.SysUserDTO;
import com.backendsys.mapper.System.SysUserMapper;
import lombok.RequiredArgsConstructor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.AuthenticationProvider;
import org.springframework.security.authentication.dao.DaoAuthenticationProvider;
import org.springframework.security.config.annotation.authentication.configuration.AuthenticationConfiguration;
import org.springframework.security.core.authority.AuthorityUtils;
import org.springframework.security.core.userdetails.User;
import org.springframework.security.core.userdetails.UserDetailsService;
import org.springframework.security.core.userdetails.UsernameNotFoundException;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;

import java.util.Map;

@Configuration
@RequiredArgsConstructor
public class ApplicationConfig {
    // 注入数据库操作DAO
    private final SysUserMapper sysUserMapper;

    /**
     * https://blog.csdn.net/studyday1/article/details/131992712
     * 调用 AuthenticationManager 的 authenticate 方法,进行用户认证
    */
    @Bean
    public UserDetailsService userDetailsService() throws UsernameNotFoundException {
        //return username -> {
        //    Map<String, Object> sysUserSimple = sysUserMapper.queryUserByIdOrName(null, username);
        //    return new User((String) sysUserSimple.get("username"), (String) sysUserSimple.get("password"), AuthorityUtils.commaSeparatedStringToAuthorityList("admin, normal"));
        //};

        // 接口每次调用都会执行？(username: 1)
        //return username -> {
        //    System.out.println("UserDetailsService (username): " + username);
        //    return new User(username, "", AuthorityUtils.commaSeparatedStringToAuthorityList("admin, normal"));
        //};
        return username -> new User(username, "", AuthorityUtils.commaSeparatedStringToAuthorityList("admin, normal"));
    }

    /**
     * TODO 四 4.2
     * @return 身份校验机制、身份验证提供程序
     */
    @Bean
    public AuthenticationProvider authenticationProvider() {
        // 创建一个用户认证提供者
        DaoAuthenticationProvider authProvider = new DaoAuthenticationProvider();
        // 设置用户相信信息，可以从数据库中读取、或者缓存、或者配置文件
        authProvider.setUserDetailsService(userDetailsService());
        // 设置加密机制，若想要尝试对用户进行身份验证，我们需要知道使用的是什么编码
        authProvider.setPasswordEncoder(passwordEncoder());
        return authProvider;
    }

    /**
     * TODO 四 4.4 基于用户名和密码或使用用户名和密码进行身份验证
     * @param config
     * @return
     * @throws Exception
     */
    @Bean
    public AuthenticationManager authenticationManager(AuthenticationConfiguration config) throws Exception {
        return config.getAuthenticationManager();
    }

    /**
     * TODO 四 4.3提供编码机制
     * @return
     */
    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }

}