// GoToSocial
// Copyright (C) GoToSocial Authors admin@gotosocial.org
// SPDX-License-Identifier: AGPL-3.0-or-later
//
// 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 user

import (
	"errors"
	"net/http"

	"github.com/gin-gonic/gin"
	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
	apiutil "github.com/superseriousbusiness/gotosocial/internal/api/util"
	"github.com/superseriousbusiness/gotosocial/internal/config"
	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
	"github.com/superseriousbusiness/gotosocial/internal/oauth"
)

const OIDCPasswordHelp = "password change request cannot be processed by GoToSocial as this instance is running with OIDC enabled; you must change password using your OIDC provider"

// PasswordChangePOSTHandler swagger:operation POST /api/v1/user/password_change userPasswordChange
//
// Change the password of authenticated user.
//
// The parameters can also be given in the body of the request, as JSON, if the content-type is set to 'application/json'.
// The parameters can also be given in the body of the request, as XML, if the content-type is set to 'application/xml'.
//
//	---
//	tags:
//	- user
//
//	consumes:
//	- application/json
//	- application/xml
//	- application/x-www-form-urlencoded
//
//	produces:
//	- application/json
//
//	security:
//	- OAuth2 Bearer:
//		- write:user
//
//	responses:
//		'200':
//			description: Change successful
//		'400':
//			description: bad request
//		'401':
//			description: unauthorized
//		'403':
//			description: forbidden
//		'406':
//			description: not acceptable
//		'422':
//			description: unprocessable request because instance is running with OIDC backend
//		'500':
//			description: internal error
func (m *Module) PasswordChangePOSTHandler(c *gin.Context) {
	authed, err := oauth.Authed(c, true, true, true, true)
	if err != nil {
		apiutil.ErrorHandler(c, gtserror.NewErrorUnauthorized(err, err.Error()), m.processor.InstanceGetV1)
		return
	}

	if _, err := apiutil.NegotiateAccept(c, apiutil.JSONAcceptHeaders...); err != nil {
		apiutil.ErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), m.processor.InstanceGetV1)
		return
	}

	if config.GetOIDCEnabled() {
		err := errors.New("instance running with OIDC")
		apiutil.ErrorHandler(c, gtserror.NewErrorUnprocessableEntity(err, OIDCPasswordHelp), m.processor.InstanceGetV1)
		return
	}

	form := &apimodel.PasswordChangeRequest{}
	if err := c.ShouldBind(form); err != nil {
		apiutil.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGetV1)
		return
	}

	if form.OldPassword == "" {
		err := errors.New("password change request missing field old_password")
		apiutil.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGetV1)
		return
	}

	if form.NewPassword == "" {
		err := errors.New("password change request missing field new_password")
		apiutil.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGetV1)
		return
	}

	if errWithCode := m.processor.User().PasswordChange(c.Request.Context(), authed.User, form.OldPassword, form.NewPassword); errWithCode != nil {
		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGetV1)
		return
	}

	apiutil.Data(c, http.StatusOK, apiutil.AppJSON, apiutil.StatusOKJSON)
}