/*
   GoToSocial
   Copyright (C) 2021 GoToSocial Authors admin@gotosocial.org

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU Affero General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU Affero General Public License for more details.

   You should have received a copy of the GNU Affero General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

package federation

import (
	"github.com/gin-gonic/gin"
)

// UsersGETHandler should be served at https://example.org/users/:username.
//
// The goal here is to return the activitypub representation of an account
// in the form of a vocab.ActivityStreamsPerson. This should only be served
// to REMOTE SERVERS that present a valid signature on the GET request, on
// behalf of a user, otherwise we risk leaking information about users publicly.
//
// And of course, the request should be refused if the account or server making the
// request is blocked.
func (m *Module) UsersGETHandler(c *gin.Context) {
	// l := m.log.WithFields(logrus.Fields{
	// 	"func": "UsersGETHandler",
	// 	"url":  c.Request.RequestURI,
	// })
	// requestedUsername := c.Param(UsernameKey)
	// if requestedUsername == "" {
	// 	err := errors.New("no username specified in request")
	// 	l.Debug(err)
	// 	c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
	// 	return
	// }

	// // make sure this actually an AP request
	// format := c.NegotiateFormat(ActivityPubAcceptHeaders...)
	// if format == "" {
	// 	err := errors.New("could not negotiate format with given Accept header(s)")
	// 	l.Debug(err)
	// 	c.JSON(http.StatusNotAcceptable, gin.H{"error": err.Error()})
	// 	return
	// }
	// l.Tracef("negotiated format: %s", format)

	// // get the account the request is referring to
	// requestedAccount := &gtsmodel.Account{}
	// if err := m.db.GetLocalAccountByUsername(requestedUsername, requestedAccount); err != nil {
	// 	l.Errorf("database error getting account with username %s: %s", requestedUsername, err)
	// 	// we'll just return not authorized here to avoid giving anything away
	// 	c.JSON(http.StatusUnauthorized, gin.H{"error": "not authorized"})
	// 	return
	// }

	// // and create a transport for it
	// transport, err := m.federator.TransportController().NewTransport(requestedAccount.PublicKeyURI, requestedAccount.PrivateKey)
	// if err != nil {
	// 	l.Errorf("error creating transport for username %s: %s", requestedUsername, err)
	// 	// we'll just return not authorized here to avoid giving anything away
	// 	c.JSON(http.StatusUnauthorized, gin.H{"error": "not authorized"})
	// 	return
	// }

	// // authenticate the request
	// authentication, err := federation.AuthenticateFederatedRequest(transport, c.Request)
	// if err != nil {
	// 	l.Errorf("error authenticating GET user request: %s", err)
	// 	c.JSON(http.StatusUnauthorized, gin.H{"error": "not authorized"})
	// 	return
	// }

	// if !authentication.Authenticated {
	// 	l.Debug("request not authorized")
	// 	c.JSON(http.StatusUnauthorized, gin.H{"error": "not authorized"})
	// 	return
	// }

	// requestingAccount := &gtsmodel.Account{}
	// if authentication.RequestingPublicKeyID != nil {
	// 	if err := m.db.GetWhere("public_key_uri", authentication.RequestingPublicKeyID.String(), requestingAccount); err != nil {

	// 	}
	// }

	// authorization, err := federation.AuthorizeFederatedRequest

	// person, err := m.tc.AccountToAS(requestedAccount)
	// if err != nil {
	// 	l.Errorf("error converting account to ap person: %s", err)
	// 	c.JSON(http.StatusUnauthorized, gin.H{"error": "not authorized"})
	// 	return
	// }

	// data, err := person.Serialize()
	// if err != nil {
	// 	l.Errorf("error serializing user: %s", err)
	// 	c.JSON(http.StatusUnauthorized, gin.H{"error": "not authorized"})
	// 	return
	// }

	// c.JSON(http.StatusOK, data)
}