package middleware

import (
	"github.com/gin-gonic/gin"
	origincfg "github.com/nexuscrm/backend/internal/interfaces/origin"
)

// Cors returns a middleware that handles Cross-Origin Resource Sharing (CORS)
func Cors() gin.HandlerFunc {
	cfg := origincfg.LoadConfigFromEnv()

	return func(c *gin.Context) {
		origin := c.Request.Header.Get("Origin")
		allowOrigin := ""

		if cfg.IsAllowedOrigin(origin) {
			allowOrigin = origin
		}

		c.Writer.Header().Set("Access-Control-Allow-Origin", allowOrigin)
		if allowOrigin != "" {
			c.Writer.Header().Set("Access-Control-Allow-Credentials", "true")
		}

		c.Writer.Header().Set("Access-Control-Allow-Methods", "GET, POST, PUT, PATCH, DELETE, OPTIONS")
		c.Writer.Header().Set("Access-Control-Allow-Headers", "Content-Type, Authorization, X-Request-ID, traceparent, X-CSRF-Token, Idempotency-Key")
		c.Writer.Header().Set("Access-Control-Max-Age", "86400")

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

		c.Next()
	}
}