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
}