/*
   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 message

import (
	"fmt"

	"github.com/superseriousbusiness/gotosocial/internal/db"
	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
)

func (p *processor) notifyStatus(status *gtsmodel.Status) error {
	// if there are no mentions in this status then just bail
	if len(status.Mentions) == 0 {
		return nil
	}

	if status.GTSMentions == nil {
		// there are mentions but they're not fully populated on the status yet so do this
		menchies := []*gtsmodel.Mention{}
		for _, m := range status.Mentions {
			gtsm := &gtsmodel.Mention{}
			if err := p.db.GetByID(m, gtsm); err != nil {
				return fmt.Errorf("notifyStatus: error getting mention with id %s from the db: %s", m, err)
			}
			menchies = append(menchies, gtsm)
		}
		status.GTSMentions = menchies
	}

	// now we have mentions as full gtsmodel.Mention structs on the status we can continue
	for _, m := range status.GTSMentions {
		// make sure this is a local account, otherwise we don't need to create a notification for it
		if m.GTSAccount == nil {
			a := &gtsmodel.Account{}
			if err := p.db.GetByID(m.TargetAccountID, a); err != nil {
				// we don't have the account or there's been an error
				return fmt.Errorf("notifyStatus: error getting account with id %s from the db: %s", m.TargetAccountID, err)
			}
			m.GTSAccount = a
		}
		if m.GTSAccount.Domain != "" {
			// not a local account so skip it
			continue
		}

		// make sure a notif doesn't already exist for this mention
		err := p.db.GetWhere([]db.Where{
			{Key: "notification_type", Value: gtsmodel.NotificationMention},
			{Key: "target_account_id", Value: m.TargetAccountID},
			{Key: "origin_account_id", Value: status.AccountID},
			{Key: "status_id", Value: status.ID},
		}, &gtsmodel.Notification{})
		if err == nil {
			// notification exists already so just continue
			continue
		}
		if _, ok := err.(db.ErrNoEntries); !ok {
			// there's a real error in the db
			return fmt.Errorf("notifyStatus: error checking existence of notification for mention with id %s : %s", m.ID, err)
		}

		// if we've reached this point we know the mention is for a local account, and the notification doesn't exist, so create it
		notif := &gtsmodel.Notification{
			NotificationType: gtsmodel.NotificationMention,
			TargetAccountID:  m.TargetAccountID,
			OriginAccountID:  status.AccountID,
			StatusID:         status.ID,
		}

		if err := p.db.Put(notif); err != nil {
			return fmt.Errorf("notifyStatus: error putting notification in database: %s", err)
		}
	}

	return nil
}

func (p *processor) notifyFollowRequest(followRequest *gtsmodel.FollowRequest, receivingAccount *gtsmodel.Account) error {
	// return if this isn't a local account
	if receivingAccount.Domain != "" {
		return nil
	}

	notif := &gtsmodel.Notification{
		NotificationType: gtsmodel.NotificationFollowRequest,
		TargetAccountID:  followRequest.TargetAccountID,
		OriginAccountID:  followRequest.AccountID,
	}

	if err := p.db.Put(notif); err != nil {
		return fmt.Errorf("notifyFollowRequest: error putting notification in database: %s", err)
	}

	return nil
}

func (p *processor) notifyFollow(follow *gtsmodel.Follow, receivingAccount *gtsmodel.Account) error {
	// return if this isn't a local account
	if receivingAccount.Domain != "" {
		return nil
	}

	// first remove the follow request notification
	if err := p.db.DeleteWhere([]db.Where{
		{Key: "notification_type", Value: gtsmodel.NotificationFollowRequest},
		{Key: "target_account_id", Value: follow.TargetAccountID},
		{Key: "origin_account_id", Value: follow.AccountID},
	}, &gtsmodel.Notification{}); err != nil {
		return fmt.Errorf("notifyFollow: error removing old follow request notification from database: %s", err)
	}

	// now create the new follow notification
	notif := &gtsmodel.Notification{
		NotificationType: gtsmodel.NotificationFollow,
		TargetAccountID:  follow.TargetAccountID,
		OriginAccountID:  follow.AccountID,
	}
	if err := p.db.Put(notif); err != nil {
		return fmt.Errorf("notifyFollow: error putting notification in database: %s", err)
	}

	return nil
}

func (p *processor) notifyFave(fave *gtsmodel.StatusFave, receivingAccount *gtsmodel.Account) error {
	// return if this isn't a local account
	if receivingAccount.Domain != "" {
		return nil
	}

	notif := &gtsmodel.Notification{
		NotificationType: gtsmodel.NotificationFave,
		TargetAccountID:  fave.TargetAccountID,
		OriginAccountID:  fave.AccountID,
		StatusID:         fave.StatusID,
	}

	if err := p.db.Put(notif); err != nil {
		return fmt.Errorf("notifyFave: error putting notification in database: %s", err)
	}

	return nil
}
