wrote descriptions and refactored for new module response with information

backend/service/events/courseService.go

@@ -1,12 +1,10 @@
 package events
 
 import (
-	"github.com/labstack/echo/v5"
 	"github.com/pocketbase/pocketbase"
 	"htwkalender/service/db"
 )
 
-func GetAllCourses(app *pocketbase.PocketBase, c echo.Context) error {
-	courses := db.GetAllCourses(app)
-	return c.JSON(200, courses)
+func GetAllCourses(app *pocketbase.PocketBase) []string {
+	return db.GetAllCourses(app)
 }

backend/service/events/eventService.go

@@ -3,21 +3,18 @@ package events
 import (
 	"github.com/labstack/echo/v5"
 	"github.com/pocketbase/pocketbase"
+	"github.com/pocketbase/pocketbase/apis"
 	"htwkalender/model"
 	"htwkalender/service/db"
+	"htwkalender/service/fetch"
 	"htwkalender/service/functions"
 )
 
-func GetModulesForCourseDistinct(app *pocketbase.PocketBase, c echo.Context, course string, semester string) error {
+func GetModulesForCourseDistinct(app *pocketbase.PocketBase, course string, semester string) (model.Events, error) {
 
 	modules, err := db.GetAllModulesForCourse(app, course, semester)
-	replaceEmptyEntryInStringArray(modules, "Sonderveranstaltungen")
-
-	if err != nil {
-		return c.JSON(400, err)
-	} else {
-		return c.JSON(200, modules)
-	}
+	replaceEmptyEntry(modules, "Sonderveranstaltungen")
+	return modules, err
 }
 
 func replaceEmptyEntryInStringArray(modules []string, replacement string) {
@@ -49,3 +46,80 @@ func GetAllModulesDistinct(app *pocketbase.PocketBase, c echo.Context) error {
 		return c.JSON(200, modules)
 	}
 }
+
+// GetModuleByName returns a module by its name
+// If the module does not exist, an error is returned
+// If the module exists, the module is returned
+// Module is a struct that exists in database as events
+func GetModuleByName(app *pocketbase.PocketBase, name string) (model.Module, error) {
+	events, err := db.FindAllEventsByModule(app, name)
+
+	if err != nil || len(events) == 0 {
+		return model.Module{}, err
+	} else {
+		return model.Module{
+			Name:     name,
+			Events:   events,
+			Prof:     events[0].Prof,
+			Course:   events[0].Course,
+			Semester: events[0].Semester,
+		}, nil
+	}
+}
+
+// DeleteAllEventsByCourseAndSemester deletes all events for a course and a semester
+// If the deletion was successful, nil is returned
+// If the deletion was not successful, an error is returned
+func DeleteAllEventsByCourseAndSemester(app *pocketbase.PocketBase, course string, semester string) error {
+	err := db.DeleteAllEventsForCourse(app, course, semester)
+	if err != nil {
+		return err
+	} else {
+		return nil
+	}
+}
+
+// UpdateModulesForCourse updates all modules for a course
+// Does Updates for ws and ss semester sequentially
+// Update runs through the following steps:
+// 1. Delete all events for the course and the semester
+// 2. Fetch all events for the course and the semester
+// 3. Save all events for the course and the semester
+// If the update was successful, nil is returned
+// If the update was not successful, an error is returned
+func UpdateModulesForCourse(app *pocketbase.PocketBase, course string) error {
+
+	var err error
+	err = DeleteAllEventsByCourseAndSemester(app, course, "ws")
+	if err != nil {
+		return err
+	}
+
+	err = DeleteAllEventsByCourseAndSemester(app, course, "ss")
+	if err != nil {
+		return err
+	}
+
+	//new string array with one element (course)
+	var courses []string
+	courses = append(courses, course)
+
+	seminarGroups := fetch.GetSeminarGroupsEventsFromHTML(courses)
+
+	collection, dbError := db.FindCollection(app, "events")
+	if dbError != nil {
+		return apis.NewNotFoundError("Collection not found", dbError)
+	}
+
+	seminarGroups = fetch.ClearEmptySeminarGroups(seminarGroups)
+
+	seminarGroups = fetch.ReplaceEmptyEventNames(seminarGroups)
+
+	_, dbError = db.SaveEvents(seminarGroups, collection, app)
+
+	if dbError != nil {
+		return apis.NewNotFoundError("Events could not be saved", dbError)
+	}
+
+	return nil
+}