package middleware

import (
	"net/http"

	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/auth"
	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/errors"
	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
	"git.frostfs.info/TrueCloudLab/frostfs-sdk-go/bearer"
	"go.uber.org/zap"
)

func Auth(center auth.Center, log *zap.Logger) Func {
	return func(h http.Handler) http.Handler {
		return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
			ctx := r.Context()
			reqInfo := GetReqInfo(ctx)
			reqInfo.User = "anon"
			box, err := center.Authenticate(r)
			if err != nil {
				if err == auth.ErrNoAuthorizationHeader {
					reqLogOrDefault(ctx, log).Debug(logs.CouldntReceiveAccessBoxForGateKeyRandomKeyWillBeUsed)
				} else {
					reqLogOrDefault(ctx, log).Error(logs.FailedToPassAuthentication, zap.Error(err))
					if _, ok := err.(errors.Error); !ok {
						err = errors.GetAPIError(errors.ErrAccessDenied)
					}
					WriteErrorResponse(w, GetReqInfo(r.Context()), err)
					return
				}
			} else {
				ctx = SetBoxData(ctx, box.AccessBox)
				if !box.ClientTime.IsZero() {
					ctx = SetClientTime(ctx, box.ClientTime)
				}
				ctx = SetAuthHeaders(ctx, box.AuthHeaders)

				if box.AccessBox.Gate.BearerToken != nil {
					reqInfo.User = bearer.ResolveIssuer(*box.AccessBox.Gate.BearerToken).String()
				}
			}

			h.ServeHTTP(w, r.WithContext(ctx))
		})
	}
}