//Calendar implementation for the HTWK Leipzig timetable. Evaluation and display of the individual dates in iCal format.
//Copyright (C) 2024 HTWKalender support@htwkalender.de

//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 <https://www.gnu.org/licenses/>.

package feed

import (
	"database/sql"
	"github.com/pocketbase/dbx"
	"github.com/pocketbase/pocketbase/daos"
	database "htwkalender/service/db"
	localTime "htwkalender/service/functions/time"
	"log/slog"
)

func ClearFeeds(db *daos.Dao, months int, clock localTime.Clock) {
	feeds, err := database.GetAllFeeds(db)
	if err != nil {
		slog.Error("CleanFeeds: failed to get all feeds", err)
		return
	}
	for _, feed := range feeds {
		// if retrieved time is older than a half year delete feed
		now := clock.Now()
		feedRetrievedTime := feed.Retrieved.Time()
		timeShift := now.AddDate(0, -months, 0)

		if feedRetrievedTime.Before(timeShift) {
			// delete feed
			var sqlResult sql.Result
			sqlResult, err = db.DB().Delete("feeds", dbx.NewExp("id = {:id}", dbx.Params{"id": feed.GetId()})).Execute()
			if err != nil {
				slog.Error("CleanFeeds: delete feed "+feed.GetId()+" failed", err)
				slog.Error("SQL Result: ", sqlResult)
			} else {
				slog.Info("CleanFeeds: delete feed " + feed.GetId() + " successful")
			}
		}
	}
}