package middleware

import (
	"net/http"

	"github.com/gin-gonic/gin"
)

func CorsMiddleware(cfg *config.ServerConfig) gin.HandlerFunc {
	return func(c *gin.Context) {
		// 处理跨域请求头
		origin := c.Request.Header.Get("Origin")
		if origin != "" && isAllowedOrigin(origin, cfg.AllowedOrigins) {
			c.Writer.Header().Set("Access-Control-Allow-Origin", origin)
		}

		c.Writer.Header().Set("Access-Control-Allow-Headers", "Origin, Content-Type, Accept, Authorization")
		c.Writer.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS")
		c.Writer.Header().Set("Access-Control-Allow-Credentials", "true")

		// 处理预检请求
		if c.Request.Method == "OPTIONS" {
			c.AbortWithStatus(http.StatusOK)
			return
		}

		c.Next()
	}
}

// 检查来源是否在允许的列表中
func isAllowedOrigin(origin string, allowedOrigins []string) bool {
	for _, allowed := range allowedOrigins {
		if allowed == "*" || allowed == origin {
			return true
		}
	}
	return false
}