package refresh

import (
	"time"

	"github.com/drone/drone/model"
	"github.com/drone/drone/remote"
	"github.com/drone/drone/router/middleware/context"
	"github.com/drone/drone/router/middleware/session"

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

func Refresh(c *gin.Context) {
	user := session.User(c)
	if user == nil || user.Expiry == 0 {
		c.Next()
		return
	}

	db := context.Database(c)
	remote_ := context.Remote(c)

	// check if the remote includes the ability to
	// refresh the user token.
	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 := model.UpdateUser(db, 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)
		}
	}

	c.Next()
}