package com.xly.erp.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.UrlBasedCorsConfigurationSource;

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

/**
 * 全局 CORS 配置 —— 规则源见 docs/04 § 1.8。
 * Spring Security 项目需在 SecurityFilterChain 启用：
 *   http.cors(c -> c.configurationSource(corsConfigurationSource()));
 */
@Configuration
public class CorsConfig {

    @Value("${app.cors.allowed-origins:*}")
    private String allowedOrigins;

    @Bean
    public UrlBasedCorsConfigurationSource corsConfigurationSource() {
        CorsConfiguration config = new CorsConfiguration();
        config.setAllowedOriginPatterns(Arrays.asList(allowedOrigins.split(",")));
        config.setAllowedMethods(List.of("GET", "POST", "PUT", "DELETE", "PATCH", "OPTIONS"));
        config.setAllowedHeaders(List.of("*"));
        config.setExposedHeaders(List.of("Authorization", "Content-Disposition"));
        config.setAllowCredentials(true);
        config.setMaxAge(3600L);

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