package events

import (
	"github.com/labstack/echo/v5"
	"github.com/pocketbase/pocketbase"
	"htwk-planner/service/db"
	"unicode"
)

func GetModulesForCourseDistinct(app *pocketbase.PocketBase, c echo.Context, course string, semester string) 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)
	}
}

func replaceEmptyEntryInStringArray(modules []string, replacement string) {
	//replace empty string with "Sonderveranstaltungen"
	for i, module := range modules {
		if checkIfOnlyWhitespace(module) {
			modules[i] = replacement
		}
	}
}

func replaceEmptyEntry(modules []struct {
	Name   string
	Course string
}, replacement string) {
	//replace empty string with "Sonderveranstaltungen"
	for i, module := range modules {
		if checkIfOnlyWhitespace(module.Name) {
			modules[i].Name = replacement
		}
	}
}

// check if course is empty or contains only whitespaces
func checkIfOnlyWhitespace(word string) bool {
	for _, letter := range word {
		if !unicode.IsSpace(letter) || !(letter == int32(160)) {
			return false
		}
	}
	return true
}

func GetAllModulesDistinct(app *pocketbase.PocketBase, c echo.Context) error {
	modules, err := db.GetAllModulesDistinct(app)

	replaceEmptyEntry(modules, "Sonderveranstaltungen")

	if err != nil {
		return c.JSON(400, err)
	} else {
		return c.JSON(200, modules)
	}
}