package middleware

import (
	"net/http"
	"stocksearch/config"
)

// CORS SvelteKit 개발 서버(localhost:5173)에서의 크로스오리진 요청 허용 미들웨어
func CORS(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		origin := r.Header.Get("Origin")
		allowed := config.App.CORSOrigin

		if allowed != "" && origin == allowed {
			w.Header().Set("Access-Control-Allow-Origin", origin)
			w.Header().Set("Access-Control-Allow-Credentials", "true")
			w.Header().Set("Access-Control-Allow-Methods", "GET,POST,PUT,DELETE,OPTIONS")
			w.Header().Set("Access-Control-Allow-Headers", "Content-Type")
		}

		// Preflight 요청 즉시 응답
		if r.Method == http.MethodOptions {
			w.WriteHeader(http.StatusNoContent)
			return
		}

		next.ServeHTTP(w, r)
	})
}