package com.aigeo.common.config;

import com.aigeo.common.security.JwtAuthenticationEntryPoint;
import com.aigeo.common.security.JwtAuthenticationFilter;
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.configuration.AuthenticationConfiguration;
import org.springframework.security.config.annotation.method.configuration.EnableMethodSecurity;
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.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.security.web.SecurityFilterChain;
import org.springframework.security.web.authentication.UsernamePasswordAuthenticationFilter;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.CorsConfigurationSource;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;

import java.util.Arrays;
import java.util.Collections;

/**
 * Spring Security 配置类
 *
 * @author AIGEO Team  
 * @since 1.0.0
 */
@Configuration
@EnableWebSecurity
@EnableMethodSecurity(prePostEnabled = true)
@RequiredArgsConstructor
public class SecurityConfig {

    private final JwtAuthenticationEntryPoint jwtAuthenticationEntryPoint;
    private final JwtAuthenticationFilter jwtAuthenticationFilter;

    /**
     * 密码编码器
     */
    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }

    /**
     * 认证管理器
     */
    @Bean
    public AuthenticationManager authenticationManager(AuthenticationConfiguration config) throws Exception {
        return config.getAuthenticationManager();
    }

    /**
     * CORS配置
     */
    @Bean
    public CorsConfigurationSource corsConfigurationSource() {
        CorsConfiguration configuration = new CorsConfiguration();
        configuration.setAllowedOriginPatterns(Collections.singletonList("*"));
        configuration.setAllowedMethods(Arrays.asList("GET", "POST", "PUT", "DELETE", "OPTIONS"));
        configuration.setAllowedHeaders(Collections.singletonList("*"));
        configuration.setAllowCredentials(true);
        
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", configuration);
        return source;
    }

    /**
     * Security过滤器链配置
     */
    @Bean
    public SecurityFilterChain filterChain(HttpSecurity http) throws Exception {
        http.cors(cors -> cors.configurationSource(corsConfigurationSource()))
            .csrf(csrf -> csrf.disable())
            .sessionManagement(session -> session.sessionCreationPolicy(SessionCreationPolicy.STATELESS))
            .exceptionHandling(ex -> ex.authenticationEntryPoint(jwtAuthenticationEntryPoint))
            .authorizeHttpRequests(auth -> auth
                // 公开接口
                .requestMatchers("/api/auth/**").permitAll()
                .requestMatchers("/api/public/**").permitAll()
                
                // API文档
                .requestMatchers("/doc.html", "/webjars/**", "/v3/api-docs/**").permitAll()
                
                // 健康检查
                .requestMatchers("/actuator/health", "/actuator/info").permitAll()
                
                // 文件上传下载
                .requestMatchers(HttpMethod.GET, "/api/files/**").permitAll()
                
                // 其他接口需要认证
                .anyRequest().authenticated()
            );

        // 添加JWT过滤器
        http.addFilterBefore(jwtAuthenticationFilter, UsernamePasswordAuthenticationFilter.class);

        return http.build();
    }
}