/*
   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 bundb

import (
	"context"
	"time"

	"codeberg.org/gruf/go-cache/v3/result"
	"github.com/superseriousbusiness/gotosocial/internal/db"
	"github.com/superseriousbusiness/gotosocial/internal/gtsmodel"
	"github.com/superseriousbusiness/gotosocial/internal/log"
	"github.com/uptrace/bun"
)

type mentionDB struct {
	conn  *DBConn
	cache *result.Cache[*gtsmodel.Mention]
}

func (m *mentionDB) init() {
	// Initialize notification result cache
	m.cache = result.NewSized([]result.Lookup{
		{Name: "ID"},
	}, func(m1 *gtsmodel.Mention) *gtsmodel.Mention {
		m2 := new(gtsmodel.Mention)
		*m2 = *m1
		return m2
	}, 1000)

	// Set cache TTL and start sweep routine
	m.cache.SetTTL(time.Minute*5, false)
	m.cache.Start(time.Second * 10)
}

func (m *mentionDB) newMentionQ(i interface{}) *bun.SelectQuery {
	return m.conn.
		NewSelect().
		Model(i).
		Relation("Status").
		Relation("OriginAccount").
		Relation("TargetAccount")
}

func (m *mentionDB) GetMention(ctx context.Context, id string) (*gtsmodel.Mention, db.Error) {
	return m.cache.Load("ID", func() (*gtsmodel.Mention, error) {
		var mention gtsmodel.Mention

		q := m.newMentionQ(&mention).
			Where("? = ?", bun.Ident("mention.id"), id)

		if err := q.Scan(ctx); err != nil {
			return nil, m.conn.ProcessError(err)
		}

		return &mention, nil
	}, id)
}

func (m *mentionDB) GetMentions(ctx context.Context, ids []string) ([]*gtsmodel.Mention, db.Error) {
	mentions := make([]*gtsmodel.Mention, 0, len(ids))

	for _, id := range ids {
		// Attempt fetch from DB
		mention, err := m.GetMention(ctx, id)
		if err != nil {
			log.Errorf("GetMentions: error getting mention %q: %v", id, err)
			continue
		}

		// Append mention
		mentions = append(mentions, mention)
	}

	return mentions, nil
}