package middleware

import (
	"net/http"

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

// CORS returns a middleware that handles Cross-Origin Resource Sharing (CORS)
func CORS() gin.HandlerFunc {
	return func(c *gin.Context) {
		origin := c.Request.Header.Get("Origin")
		if origin != "" {
			c.Writer.Header().Set("Access-Control-Allow-Origin", origin)
		} else {
			c.Writer.Header().Set("Access-Control-Allow-Origin", "*")
		}

		c.Writer.Header().Set("Access-Control-Allow-Credentials", "true")
		c.Writer.Header().Set("Access-Control-Allow-Headers", "Content-Type, Content-Length, Accept-Encoding, X-CSRF-Token, Authorization, accept, origin, Cache-Control, X-Requested-With, X-Signature, X-Timestamp, X-Request-ID, X-Rate-Limit-Remaining, X-Rate-Limit-Reset")
		c.Writer.Header().Set("Access-Control-Allow-Methods", "POST, OPTIONS, GET, PUT, PATCH, DELETE")

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

		c.Next()
	}
}