package middleware

import (
	"context"
	"net/http"

	"github.com/alexedwards/scs/v2"
)

type ctxKey string

const UserIDKey ctxKey = "user_id"

func AuthRequired(sm *scs.SessionManager) func(http.Handler) http.Handler {
	return func(next http.Handler) http.Handler {
		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			if !sm.Exists(r.Context(), "user_id") {
				w.WriteHeader(http.StatusUnauthorized)
				w.Write([]byte(`{"error":"não autenticado"}`))
				return
			}
			next.ServeHTTP(w, r)
		})
	}
}

func LoadUserID(sm *scs.SessionManager) func(http.Handler) http.Handler {
	return func(next http.Handler) http.Handler {
		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			uid, ok := sm.Get(r.Context(), "user_id").(string)
			if ok {
				r = r.WithContext(context.WithValue(r.Context(), UserIDKey, uid))
			}
			next.ServeHTTP(w, r)
		})
	}
}

func GetUserID(ctx context.Context) string {
	v := ctx.Value(UserIDKey)
	if s, ok := v.(string); ok {
		return s
	}
	return ""
}