feat:#34 refactored function to intended service, fixed docker files

services/data-manager/service/feed/feedFunctions.go

@@ -0,0 +1,126 @@
+//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"
+	"htwkalender/model"
+	database "htwkalender/service/db"
+	localTime "htwkalender/service/functions/time"
+	"log/slog"
+	"strings"
+)
+
+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", "error", 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", "error", err)
+				slog.Error("SQL Result: ", "error", sqlResult)
+			} else {
+				slog.Info("CleanFeeds: delete feed " + feed.GetId() + " successful")
+			}
+		}
+	}
+}
+
+func CombineEventsInFeed(events model.Events) model.Events {
+	// Combine events with the same name, start, end and course
+	// check if there are events
+	if len(events) > 0 {
+		combinedEvents := model.Events{events[0]}
+
+		for i := 1; i < len(events); i++ {
+			// check if the event is already in the combinedEvents
+			alreadyInCombinedEvents := false
+
+			for j := 0; j < len(combinedEvents); j++ {
+				if events[i].Name == combinedEvents[j].Name &&
+					events[i].Start == combinedEvents[j].Start &&
+					events[i].End == combinedEvents[j].End &&
+					events[i].Course == combinedEvents[j].Course {
+					alreadyInCombinedEvents = true
+					combinedEvents[j].Notes = addNotesIfAlreadyRoomsAdded(events, combinedEvents, j, i)
+					combinedEvents[j].Prof = combineProfs(events, i, combinedEvents, j)
+					combinedEvents[j].Rooms = combineRooms(events, i, combinedEvents, j)
+					break
+				}
+			}
+			if !alreadyInCombinedEvents {
+				combinedEvents = append(combinedEvents, events[i])
+			}
+		}
+		return combinedEvents
+	}
+	return model.Events{}
+}
+
+func addNotesIfAlreadyRoomsAdded(events model.Events, combinedEvents model.Events, index2 int, index1 int) string {
+	// check if combinedEvents[index2].Rooms string contains comma "," &#44
+	if !strings.Contains(combinedEvents[index2].Rooms, ",") {
+		return descriptionString(combinedEvents[index2]) + "\n" + descriptionString(events[index1])
+	} else {
+		return combinedEvents[index2].Notes + "\n" + descriptionString(events[index1])
+	}
+}
+
+func combineProfs(events model.Events, index1 int, combinedEvents model.Events, index2 int) string {
+	// combine the profs
+	if events[index1].Prof != "" {
+		if combinedEvents[index2].Prof == "" {
+			return events[index1].Prof
+		} else {
+			if !strings.Contains(combinedEvents[index2].Prof, events[index1].Prof) {
+				return combinedEvents[index2].Prof + ", " + events[index1].Prof
+			}
+		}
+	}
+	return combinedEvents[index2].Prof
+}
+
+func descriptionString(event model.Event) string {
+	return event.Rooms + " - " + event.Notes + " (" + event.Prof + ")"
+}
+
+func combineRooms(events model.Events, index1 int, combinedEvents model.Events, index2 int) string {
+	// combine the rooms
+	if events[index1].Rooms != "" {
+		if combinedEvents[index2].Rooms == "" {
+			return events[index1].Rooms
+		} else {
+			if !strings.Contains(combinedEvents[index2].Rooms, events[index1].Rooms) {
+				return combinedEvents[index2].Rooms + ", " + events[index1].Rooms
+			}
+		}
+	}
+	return combinedEvents[index2].Rooms
+}