// Copyright 2018 Drone.IO Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package token

import (
	"time"

	"github.com/laszlocph/drone-oss-08/remote"
	"github.com/laszlocph/drone-oss-08/router/middleware/session"
	"github.com/laszlocph/drone-oss-08/store"

	log "github.com/Sirupsen/logrus"
	"github.com/gin-gonic/gin"
)

func Refresh(c *gin.Context) {
	user := session.User(c)
	if user == nil {
		c.Next()
		return
	}

	// check if the remote includes the ability to
	// refresh the user token.
	remote_ := remote.FromContext(c)
	refresher, ok := remote_.(remote.Refresher)
	if !ok {
		c.Next()
		return
	}

	// check to see if the user token is expired or
	// will expire within the next 30 minutes (1800 seconds).
	// If not, there is nothing we really need to do here.
	if time.Now().UTC().Unix() < (user.Expiry - 1800) {
		c.Next()
		return
	}

	// attempts to refresh the access token. If the
	// token is refreshed, we must also persist to the
	// database.
	ok, _ = refresher.Refresh(user)
	if ok {
		err := store.UpdateUser(c, user)
		if err != nil {
			// we only log the error at this time. not sure
			// if we really want to fail the request, do we?
			log.Errorf("cannot refresh access token for %s. %s", user.Login, err)
		} else {
			log.Infof("refreshed access token for %s", user.Login)
		}
	}

	c.Next()
}