//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 events

import (
	"github.com/pocketbase/pocketbase"
	"htwkalender/service/db"
	"htwkalender/service/functions"
)

func GetAllCourses(app *pocketbase.PocketBase) []string {
	return db.GetAllCourses(app)
}

func GetAllCoursesForSemester(app *pocketbase.PocketBase, semester string) []string {
	return db.GetAllCoursesForSemester(app, semester)
}

func GetAllCoursesForSemesterWithEvents(app *pocketbase.PocketBase, semester string) ([]string, error) {
	courses, err := db.GetAllCoursesForSemesterWithEvents(app, semester)
	if err != nil {
		return nil, err
	} else {
		// remove empty courses like " " or ""
		courses = removeEmptyCourses(courses)
		return courses, nil
	}
}

// removeEmptyCourses removes empty courses from the list of courses
func removeEmptyCourses(courses []string) []string {
	var filteredCourses []string

	for index, course := range courses {
		if !functions.OnlyWhitespace(course) || len(course) != 0 {
			filteredCourses = append(filteredCourses, courses[index])
		}
	}
	return filteredCourses
}