// Package middleware 提供HTTP中间件
package middleware

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

// CORS 跨域资源共享中间件
func CORS() gin.HandlerFunc {
	return func(c *gin.Context) {
		c.Header("Access-Control-Allow-Origin", "*")
		c.Header("Access-Control-Allow-Methods", "GET, POST, PUT, DELETE, OPTIONS")
		c.Header("Access-Control-Allow-Headers", "Origin, Content-Type, Authorization, X-Requested-With")
		c.Header("Access-Control-Expose-Headers", "Content-Length, Content-Type")
		c.Header("Access-Control-Max-Age", "86400")

		if c.Request.Method == "OPTIONS" {
			c.AbortWithStatus(204)
			return
		}

		c.Next()
	}
}

// UTF8ContentType 确保JSON响应使用UTF-8编码
func UTF8ContentType() gin.HandlerFunc {
	return func(c *gin.Context) {
		c.Next()
		// 为JSON响应添加charset
		contentType := c.Writer.Header().Get("Content-Type")
		if contentType == "application/json" {
			c.Writer.Header().Set("Content-Type", "application/json; charset=utf-8")
		}
	}
}