package com.yoyuzh.config;

import com.fasterxml.jackson.databind.ObjectMapper;
import com.yoyuzh.admin.ApiRequestMetricsFilter;
import com.yoyuzh.auth.CustomUserDetailsService;
import com.yoyuzh.common.ApiResponse;
import com.yoyuzh.common.ErrorCode;
import lombok.RequiredArgsConstructor;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.MediaType;
import org.springframework.http.HttpMethod;
import org.springframework.security.authentication.AuthenticationManager;
import org.springframework.security.authentication.AuthenticationProvider;
import org.springframework.security.authentication.dao.DaoAuthenticationProvider;
import org.springframework.security.config.Customizer;
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.List;

@Configuration
@EnableWebSecurity
@EnableMethodSecurity
@RequiredArgsConstructor
public class SecurityConfig {

    private final JwtAuthenticationFilter jwtAuthenticationFilter;
    private final ApiRequestMetricsFilter apiRequestMetricsFilter;
    private final CustomUserDetailsService userDetailsService;
    private final ObjectMapper objectMapper;
    private final CorsProperties corsProperties;

    @Bean
    public SecurityFilterChain securityFilterChain(HttpSecurity http) throws Exception {
        http
                .csrf(csrf -> csrf.disable())
                .cors(Customizer.withDefaults())
                .sessionManagement(session -> session.sessionCreationPolicy(SessionCreationPolicy.STATELESS))
                .authorizeHttpRequests(auth -> auth
                        .requestMatchers("/api/auth/**", "/v3/api-docs/**", "/swagger-ui/**", "/swagger-ui.html")
                        .permitAll()
                        .requestMatchers("/api/app/android/latest", "/api/app/android/download", "/api/app/android/download/*")
                        .permitAll()
                        .requestMatchers(HttpMethod.GET, "/api/v2/site/ping")
                        .permitAll()
                        .requestMatchers("/api/v2/files/**")
                        .authenticated()
                        .requestMatchers("/api/transfer/**")
                        .permitAll()
                        .requestMatchers(HttpMethod.GET, "/api/files/share-links/*")
                        .permitAll()
                        .requestMatchers("/api/admin/**")
                        .authenticated()
                        .requestMatchers("/api/files/**", "/api/user/**")
                        .authenticated()
                        .anyRequest()
                        .permitAll())
                .authenticationProvider(authenticationProvider())
                .exceptionHandling(ex -> ex
                        .authenticationEntryPoint((request, response, e) -> {
                            response.setStatus(401);
                            response.setContentType(MediaType.APPLICATION_JSON_VALUE);
                            objectMapper.writeValue(response.getWriter(),
                                    ApiResponse.error(ErrorCode.NOT_LOGGED_IN, "用户未登录"));
                        })
                        .accessDeniedHandler((request, response, e) -> {
                            response.setStatus(403);
                            response.setContentType(MediaType.APPLICATION_JSON_VALUE);
                            objectMapper.writeValue(response.getWriter(),
                                    ApiResponse.error(ErrorCode.PERMISSION_DENIED, "权限不足"));
                        }))
                .addFilterBefore(apiRequestMetricsFilter, UsernamePasswordAuthenticationFilter.class)
                .addFilterBefore(jwtAuthenticationFilter, UsernamePasswordAuthenticationFilter.class);
        return http.build();
    }

    @Bean
    public AuthenticationProvider authenticationProvider() {
        DaoAuthenticationProvider provider = new DaoAuthenticationProvider();
        provider.setUserDetailsService(userDetailsService);
        provider.setPasswordEncoder(passwordEncoder());
        return provider;
    }

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

    @Bean
    public PasswordEncoder passwordEncoder() {
        return new BCryptPasswordEncoder();
    }

    @Bean
    public CorsConfigurationSource corsConfigurationSource() {
        CorsConfiguration configuration = new CorsConfiguration();
        configuration.setAllowedOrigins(corsProperties.getAllowedOrigins());
        configuration.setAllowedMethods(List.of("GET", "POST", "PUT", "PATCH", "DELETE", "OPTIONS"));
        configuration.setAllowedHeaders(List.of("*"));
        configuration.setAllowCredentials(false);
        configuration.setMaxAge(3600L);

        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", configuration);
        return source;
    }
}