package com.trafficaudit.common.config;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.cors.CorsConfiguration;
import org.springframework.web.cors.CorsConfigurationSource;
import org.springframework.web.cors.UrlBasedCorsConfigurationSource;
import org.springframework.web.filter.CorsFilter;

import java.util.Arrays;
import java.util.List;

/**
 * 跨域配置：只允许配置中列出的来源访问接口。
 * 前后端分离本地开发默认放行 8080；前端经 dev-server 代理或与后端同源部署时均不需要额外放行。
 * 注意：不开启 allowCredentials（接口用 Bearer 令牌鉴权，不依赖 Cookie），避免任意站点携带凭证调用。
 */
@Configuration
public class CorsConfig {

    @Value("${app.cors.allowed-origins:http://localhost:8080,http://127.0.0.1:8080}")
    private String allowedOrigins;

    private List<String> originList() {
        return Arrays.asList(allowedOrigins.split(","));
    }

    @Bean
    public CorsConfigurationSource corsConfigurationSource() {
        CorsConfiguration config = new CorsConfiguration();
        config.setAllowedOrigins(originList());
        config.setAllowedHeaders(Arrays.asList("Authorization", "Content-Type", "Accept", "X-Requested-With"));
        config.setAllowedMethods(Arrays.asList("GET", "POST", "PUT", "DELETE", "OPTIONS"));
        config.setAllowCredentials(false);
        config.setMaxAge(3600L);
        UrlBasedCorsConfigurationSource source = new UrlBasedCorsConfigurationSource();
        source.registerCorsConfiguration("/**", config);
        return source;
    }

    @Bean
    public CorsFilter corsFilter() {
        return new CorsFilter(corsConfigurationSource());
    }
}