// Copyright (c) 2026 Probo Inc <hello@probo.com>.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

package authn

import (
	"net/http"

	"github.com/99designs/gqlgen/graphql"
	"github.com/vektah/gqlparser/v2/gqlerror"
	"go.gearno.de/kit/httpserver"
	"go.probo.inc/probo/pkg/baseurl"
	"go.probo.inc/probo/pkg/bearertoken"
	"go.probo.inc/probo/pkg/server/gqlutils"
)

func NewIdentityPresenceMiddleware(baseURL *baseurl.BaseURL) func(next http.Handler) http.Handler {
	return func(next http.Handler) http.Handler {
		return http.HandlerFunc(
			func(w http.ResponseWriter, r *http.Request) {
				ctx := r.Context()
				identity := IdentityFromContext(ctx)

				if identity == nil {
					if bearertoken.IsAttempt(r.Header.Get("Authorization")) {
						bearertoken.SetBearerInvalidToken(w, baseURL)
					} else {
						bearertoken.SetBearerUnauthenticated(w, baseURL)
					}

					httpserver.RenderJSON(
						w,
						http.StatusUnauthorized,
						&graphql.Response{
							Errors: gqlerror.List{
								gqlutils.Unauthenticatedf(
									r.Context(),
									"authentication is required to access this resource",
								),
							},
						},
					)

					return
				}

				next.ServeHTTP(w, r)
			},
		)
	}
}