package v3

import (
	"encoding/json"
	"log/slog"
	"net/http"
)

func parseFaculties(url string, client *http.Client) (faculties, error) {

	// the url is paginated, so we need to fetch all pages
	// example url: https://luna.htwk-leipzig.de/api/fakultaeten?page=1&itemsPerPage=100
	// the itemsPerPage is set to 100, so we need to fetch all pages until we get an empty response

	var fetchedFaculties []faculty
	var itemsPerPage = 999

	responses, err := paginatedFetch(url, itemsPerPage, client)

	if err != nil {
		slog.Error("Error while fetching faculties", err)
		return faculties{}, err
	}

	for _, response := range responses {
		var facs faculties
		err = json.Unmarshal([]byte(response), &facs)
		if err != nil {
			slog.Error("Error while unmarshalling faculties", err)
			return faculties{}, err
		}

		fetchedFaculties = append(fetchedFaculties, facs.Faculties...)
	}

	return faculties{
		Faculties: fetchedFaculties,
	}, nil
}