// deleteOfficeHourHandler
package controllers

import (
	"database/sql"
	"errors"
	"net/http"
	"officeHours/models"
	"officeHours/templating"
	"strconv"
)

// Offer a table of all office hours to delete,
// verify the corresponding mail address and
// then send a confirmation mail.
func (b *BaseHandler) DeleteOfficeHourHandler(w http.ResponseWriter, req *http.Request) {
	if req.FormValue("id") != "" {
		id, err := strconv.Atoi(req.FormValue("id"))
		if err != nil {
			w.WriteHeader(http.StatusBadRequest)
			templating.ServeTemplate(w, "deleteFailure", struct{ Error string }{"Id konnte nicht gelesen werden."})
			return
		}
		officeHour, err := b.officeHourRepo.FindById(id)
		if err != nil {
			if errors.Is(err, sql.ErrNoRows) {
				w.WriteHeader(http.StatusNotFound)
				templating.ServeTemplate(w, "deleteFailure", struct{ Error string }{"Sprechstunde wurde nicht gefunden."})
			} else {
				w.WriteHeader(http.StatusInternalServerError)
				templating.ServeTemplate(w, "deleteFailure", struct{ Error error }{err})
			}
			return
		}
		if req.FormValue("email") == "" {
			templating.ServeTemplate(w, "deleteMailForm", struct {
				Error      string
				OfficeHour models.OfficeHour
			}{"", officeHour})
			return
		}
		if req.FormValue("email") != officeHour.Tutor.Email {
			w.WriteHeader(http.StatusUnauthorized)
			templating.ServeTemplate(w, "deleteMailForm", struct {
				Error      string
				OfficeHour models.OfficeHour
			}{"Die Sprechstunde wurde nicht mit dieser Mailadresse angegeben.", officeHour})
			return
		}
		_, err = b.requestRepo.Add(officeHour, models.RequestDelete)
		if err != nil {
			w.WriteHeader(http.StatusInternalServerError)
			templating.ServeTemplate(w, "deleteFailure", struct{ Error error }{err})
			return
		}
		templating.ServeTemplate(w, "deleteSuccess", nil)
	} else {
		officeHours, _ := b.officeHourRepo.GetAll(true)
		timetable, slots := b.GetTimetable(officeHours)
		b.writeTimetablePage(w, req, b.printTimetable(timetable, slots, true))
	}
}