package middleware

import (
	"net/http"
	"os"
	"strings"
	"time"

	"github.com/rs/zerolog"
)

// CORS middleware med strikt origin-kontroll
func CORS(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		origin := r.Header.Get("Origin")
		
		// Hämta tillåtna origins från miljövariabel
		allowedOrigins := os.Getenv("CORS_ORIGINS")
		if allowedOrigins == "" {
			allowedOrigins = "http://localhost:3000"
		}
		
		origins := strings.Split(allowedOrigins, ",")
		allowed := false
		
		for _, o := range origins {
			o = strings.TrimSpace(o)
			if o == origin {
				allowed = true
				break
			}
		}
		
		// I utveckling, tillåt localhost
		if !allowed && strings.HasPrefix(origin, "http://localhost:") {
			allowed = true
		}
		
		if 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, Authorization, X-Request-ID")
		w.Header().Set("Access-Control-Max-Age", "86400")

		if r.Method == "OPTIONS" {
			w.WriteHeader(http.StatusOK)
			return
		}

		next.ServeHTTP(w, r)
	})
}

func Logger(logger zerolog.Logger) func(http.Handler) http.Handler {
	return func(next http.Handler) http.Handler {
		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			start := time.Now()
			next.ServeHTTP(w, r)
			logger.Info().
				Str("method", r.Method).
				Str("path", r.URL.Path).
				Dur("duration", time.Since(start)).
				Msg("request")
		})
	}
}