/*
   GoToSocial
   Copyright (C) 2021-2022 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 account

import (
	"context"
	"errors"
	"fmt"

	"github.com/superseriousbusiness/gotosocial/internal/ap"
	apimodel "github.com/superseriousbusiness/gotosocial/internal/api/model"
	"github.com/superseriousbusiness/gotosocial/internal/db"
	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
	"github.com/superseriousbusiness/gotosocial/internal/messages"
)

func (p *processor) BlockRemove(ctx context.Context, requestingAccount *gtsmodel.Account, targetAccountID string) (*apimodel.Relationship, gtserror.WithCode) {
	// make sure the target account actually exists in our db
	targetAccount, err := p.db.GetAccountByID(ctx, targetAccountID)
	if err != nil {
		return nil, gtserror.NewErrorNotFound(fmt.Errorf("BlockCreate: error getting account %s from the db: %s", targetAccountID, err))
	}

	// check if a block exists, and remove it if it does
	block, err := p.db.GetBlock(ctx, requestingAccount.ID, targetAccountID)
	if err == nil {
		// we got a block, remove it
		block.Account = requestingAccount
		block.TargetAccount = targetAccount
		if err := p.db.DeleteBlockByID(ctx, block.ID); err != nil {
			return nil, gtserror.NewErrorInternalError(fmt.Errorf("BlockRemove: error removing block from db: %s", err))
		}

		// send the UNDO activity to the client worker for async processing
		p.clientWorker.Queue(messages.FromClientAPI{
			APObjectType:   ap.ActivityBlock,
			APActivityType: ap.ActivityUndo,
			GTSModel:       block,
			OriginAccount:  requestingAccount,
			TargetAccount:  targetAccount,
		})
	} else if !errors.Is(err, db.ErrNoEntries) {
		return nil, gtserror.NewErrorInternalError(fmt.Errorf("BlockRemove: error getting possible block from db: %s", err))
	}

	// return whatever relationship results from all this
	return p.RelationshipGet(ctx, requestingAccount, targetAccountID)
}
