package com.kamco.cd.kamcoback.config;

import com.kamco.cd.kamcoback.auth.CustomAuthenticationProvider;
import com.kamco.cd.kamcoback.auth.JwtAuthenticationFilter;
import java.util.List;
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.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.http.SessionCreationPolicy;
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;

@Configuration
@EnableWebSecurity
@RequiredArgsConstructor
public class SecurityConfig {

  private final JwtAuthenticationFilter jwtAuthenticationFilter;
  private final CustomAuthenticationProvider customAuthenticationProvider;

  @Bean
  public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {

    http.cors(cors -> cors.configurationSource(corsConfigurationSource()))
        .csrf(csrf -> csrf.disable()) // CSRF 보안 기능 비활성화
        .sessionManagement(
            sm ->
                sm.sessionCreationPolicy(
                    SessionCreationPolicy.STATELESS)) // 서버 세션 만들지 않음, 요청은 JWT 인증
        .formLogin(form -> form.disable()) // react에서 로그인 요청 관리
        .httpBasic(basic -> basic.disable()) // 기본 basic 인증 비활성화 JWT 인증사용
        .logout(logout -> logout.disable()) // 기본 로그아웃 비활성화 JWT는 서버 상태가 없으므로 로그아웃 처리 필요 없음
        .authenticationProvider(
            customAuthenticationProvider) // 로그인 패스워드 비교방식 스프링 기본 Provider 사용안함 커스텀 사용
        .authorizeHttpRequests(
            auth ->
                auth
                    // ADMIN만 접근
                    .requestMatchers("/api/test/admin")
                    .hasRole("ADMIN")

                    // ADMIN, LABELER 접근
                    .requestMatchers("/api/test/label")
                    .hasAnyRole("ADMIN", "LABELER")

                    // ADMIN, REVIEWER 접근
                    .requestMatchers("/api/test/review")
                    .hasAnyRole("ADMIN", "REVIEWER")
                    .requestMatchers(HttpMethod.OPTIONS, "/**")
                    .permitAll() // preflight 허용
                    .requestMatchers(
                        "/api/auth/signin",
                        "/api/auth/refresh",
                        "/swagger-ui/**",
                        "/api/members/*/password",
                        "/v3/api-docs/**")
                    .permitAll()
                    .anyRequest()
                    .authenticated())
        .addFilterBefore(
            jwtAuthenticationFilter,
            UsernamePasswordAuthenticationFilter
                .class) // 요청 들어오면 먼저 JWT 토큰 검사 후 security context 에 사용자 정보 저장.
    ;

    return http.build();
  }

  @Bean
  public AuthenticationManager authenticationManager(AuthenticationConfiguration configuration)
      throws Exception {
    return configuration.getAuthenticationManager();
  }

  /**
   * CORS 설정
   *
   * @return
   */
  @Bean
  public CorsConfigurationSource corsConfigurationSource() {
    CorsConfiguration config = new CorsConfiguration(); // CORS 객체 생성
    config.setAllowedOriginPatterns(List.of("*")); // 도메인 허용
    config.setAllowedMethods(List.of("GET", "POST", "PUT", "DELETE", "OPTIONS"));
    config.setAllowedHeaders(List.of("*")); // 헤더요청 Authorization, Content-Type, X-Custom-Header
    config.setAllowCredentials(true); // 쿠키, Authorization 헤더, Bearer Token 등 자격증명 포함 요청을 허용할지 설정

    UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
    /** "/**" → 모든 API 경로에 대해 이 CORS 규칙을 적용 /api/** 같이 특정 경로만 지정 가능. */
    source.registerCorsConfiguration("/**", config); // CORS 정책을 등록
    return source;
  }
}