package auth

import (
	"context"
	"net/http"
)

const sessionCookieName = "session"

type contextKey string

const userContextKey contextKey = "user"

func RequireAuth(store *Store) func(http.Handler) http.Handler {
	return func(next http.Handler) http.Handler {
		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			cookie, err := r.Cookie(sessionCookieName)
			if err != nil || cookie.Value == "" {
				http.Redirect(w, r, "/login", http.StatusFound)
				return
			}

			session, err := store.GetSession(cookie.Value)
			if err != nil {
				http.Redirect(w, r, "/login", http.StatusFound)
				return
			}

			ctx := context.WithValue(r.Context(), userContextKey, session.User)
			next.ServeHTTP(w, r.WithContext(ctx))
		})
	}
}

func RequireAdmin(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		user, ok := UserFromContext(r.Context())
		if !ok || !user.IsAdmin {
			http.Error(w, "forbidden", http.StatusForbidden)
			return
		}

		next.ServeHTTP(w, r)
	})
}

func UserFromContext(ctx context.Context) (*User, bool) {
	user, ok := ctx.Value(userContextKey).(*User)
	return user, ok
}