feat:#5 added free rooms api endpoint

backend/service/room/roomService.go

@@ -4,6 +4,8 @@ import (
 	"github.com/pocketbase/pocketbase"
 	"htwkalender/model"
 	"htwkalender/service/db"
+	"htwkalender/service/functions"
+	"time"
 )
 
 func GetRooms(app *pocketbase.PocketBase) ([]string, error) {
@@ -41,3 +43,46 @@ func anonymizeRooms(events []model.Event) []model.AnonymizedEventDTO {
 	}
 	return anonymizedEvents
 }
+
+func GetFreeRooms(app *pocketbase.PocketBase, from time.Time, to time.Time) ([]string, error) {
+	rooms, err := db.GetRooms(app)
+	if err != nil {
+		return nil, err
+	}
+	var events model.Events
+	events, err = db.GetEventsInTimeRange(app, from, to)
+	if err != nil {
+		return nil, err
+	}
+	freeRooms := removeRoomsThatHaveEvents(rooms, events)
+	return freeRooms, nil
+}
+
+func removeRoomsThatHaveEvents(rooms []string, schedule []model.Event) []string {
+	var freeRooms []string
+	for _, room := range rooms {
+		if !isRoomInSchedule(room, schedule) {
+			freeRooms = append(freeRooms, room)
+		}
+	}
+	return freeRooms
+}
+
+func isRoomInSchedule(room string, schedule []model.Event) bool {
+	for _, event := range schedule {
+		if event.Course != "Sport" {
+			rooms := functions.SeperateRoomString(event.Rooms)
+			// check if room is in rooms
+			for _, r := range rooms {
+				if r == room {
+					return true
+				}
+			}
+		} else {
+			if event.Rooms == room {
+				return true
+			}
+		}
+	}
+	return false
+}