function resetInsertAppointmentForm() {
    $.get(getResetSelectedAppointmentUrl())
        .always(function() {
            if($(window).width() < 768) {
                hideAppointmentForm();
            }
        });

    $("#scheduler-start-time, #scheduler-end-time, #subject, #location, #notice").val("");

    $("#scheduler-start-date, #scheduler-end-date").val(moment().format("DD.MM.YYYY"));

    $("#resources-popup input:checked").each(function() {
        $(this).prop("checked", false);
    });

    $("#selected-resources-list").empty();
}

function submitInsertAppointmentForm() {
    showSpinner();
    validateAppointmentForm();
}

function submitSchedulerDateForm() {
    showSpinner();
    $("#scheduler-date-form").submit();
}

function validateAppointmentForm() {
    var startTimePicker = $("#scheduler-start-time-picker");
    var startDatePicker = $("#scheduler-start-date-picker");
    var endTimePicker = $("#scheduler-end-time-picker");
    var endDatePicker = $("#scheduler-end-date-picker");

    var isStartTimeInputEmpty = isEmptyOrSpaces($("#scheduler-start-time").val());
    var isEndTimeInputEmpty = isEmptyOrSpaces($("#scheduler-end-time").val());
    var isStartDateInputEmpty = isEmptyOrSpaces($("#scheduler-start-date").val());
    var isEndDateInputEmpty = isEmptyOrSpaces($("#scheduler-end-date").val());
    
    startTimePicker.datetimepicker("show");
    startTimePicker.datetimepicker("hide");

    startDatePicker.datetimepicker("show");
    startDatePicker.datetimepicker("hide");

    endTimePicker.datetimepicker("show");
    endTimePicker.datetimepicker("hide");

    endDatePicker.datetimepicker("show");
    endDatePicker.datetimepicker("hide");

    var startTime = startTimePicker.datetimepicker("date");
    var endTime = endTimePicker.datetimepicker("date");
    var startDate = startDatePicker.datetimepicker("date");
    var endDate = endDatePicker.datetimepicker("date");

    var a = startDate === undefined || startDate === null || !startDate.isValid();
    var b = endDate === undefined || endDate === null || !endDate.isValid();
    var c = startTime === undefined || startTime === null || !startTime.isValid();
    var d = endTime === undefined || endTime === null || !endTime.isValid();

    if(a || b || c || d || isStartDateInputEmpty || isStartTimeInputEmpty || isEndTimeInputEmpty || isEndDateInputEmpty) {
        
        hideSpinner();
        $("#messagePopup .modal-body").html('<div class="alert alert-danger" role="alert">Die Zeit- und/oder Datumsangaben sind nicht korrekt.</div>');
        showMessagePopup("Fehler");
        $("#scheduler-start-time, #scheduler-end-time").val("");
        return;
    }

    if(endDate.isValid() === false) {
        endDate = startDate.clone();
    }

    startDate = startDate.hours(startTime.hours());
    startDate = startDate.minutes(startTime.minutes());

    endDate = endDate.hours(endTime.hours());
    endDate = endDate.minutes(endTime.minutes());

    if(endDate.isBefore(startDate)) {
        hideSpinner();
        $("#messagePopup .modal-body").html('<div class="alert alert-danger" role="alert">Das Startdatum muss vor dem Enddatum liegen.</div>');
        showMessagePopup("Fehler");
        return;
    }

    var selectedOids = [];
    var oidString = "";

    $("#resources-popup input:checked").each(function() {
        var id = $(this).attr("id");
        selectedOids.push(id.split("-")[0]);
    });

    for(var i = 0; i < selectedOids.length; i++) {
        oidString += selectedOids[i] + ",";
    }

    $.get(getCheckResourcesAvailabilityUrl(), { start: startDate.format("DD.MM.YYYY HH:mm"), end: endDate.format("DD.MM.YYYY HH:mm"), resourceOids: oidString }).done(function(result) {
        if(result === undefined || result === null || result.length === 0) {
            return;
        }

        if (result.length > 1) {
            try {
                var unavailableResources = $.parseJSON(result);
                var resourceCount = 0;
                var names = "";

                $.each(unavailableResources, function(index, resource) {
                    if (names.length > 1) {
                        names += ", ";
                    }

                    resourceCount++;

                    names += resource.Name;
                });

                var unavailableResourcesMessage;
                
                if(resourceCount > 0) {
                    if(resourceCount > 1) {
                        unavailableResourcesMessage = "Einige der ausgewählten Ressourcen (" + names + ") sind zum gewählten Zeitpunkt nicht verfügbar.";
                    } else {
                        unavailableResourcesMessage = "Eine der ausgewählten Ressourcen (" + names + ") ist zum gewählten Zeitpunkt nicht verfügbar.";
                    }

                    hideSpinner();
                    $("#messagePopup .modal-body").html('<div class="alert alert-warning" role="alert">' + unavailableResourcesMessage + "<br/><br/>Möchten Sie trotzdem speichern?</div>");
                    showMessagePopup("Fehler");
                    showMessagePopupWithCallback("Überschneidung",
                        null,
                        function() {
                            $("#messagePopup .modal-body").html();
                            showSpinner();
                            insertOrUpdateAppointment(startDate.format("DD.MM.YYYY"), endDate.format("DD.MM.YYYY"), startDate.format("HH:mm"), endDate.format("HH:mm"));
                        });

                    return;
                }
            } catch(error) {
                console.log("%c" + error.message, "color:red;");
                hideSpinner();
                return;
            }
        }

        insertOrUpdateAppointment(startDate.format("DD.MM.YYYY"), endDate.format("DD.MM.YYYY"), startDate.format("HH:mm"), endDate.format("HH:mm"));
    });
}

function insertOrUpdateAppointment(formattedStartDate, formattedEndDate, formattedStartTime, formattedEndTime) {
    $.get(
        getCheckForOverlappingAppointmentsUrl(),
        {
            startDateRaw: formattedStartDate,
            endDateRaw: formattedEndDate,
            startTimeRaw: formattedStartTime,
            endTimeRaw: formattedEndTime
        }
    ).done(function(result) {
        var isOverlapping = $.parseJSON(result);

        if(isOverlapping === true) {
            hideSpinner();
            $("#messagePopup .modal-body").html('<div class="alert alert-warning" role="alert">Dieser Termin überschneidet sich mit einem anderen bereits existierenden Termin.<br/> Möchten Sie ihn wirklich speichern?</div>');
            showMessagePopupWithCallback("Überschneidung",
                null,
                function() {
                    $("#messagePopup .modal-body").html();
                    showSpinner();
                    $("#insert-appointment-form").submit();
                });
        } else {
            $("#insert-appointment-form").submit();
        }
    });
}

function hideAppointmentForm() {
    $("#form-container").addClass("d-none d-sm-none");
}

function showAppointmentForm() {
    $("#form-container").removeClass("d-none d-sm-none");
}

function toggleAppointmentForm() {
    var isVisible = $("#form-container").css("display") === "block";

    if (isVisible) {
        hideAppointmentForm();
    } else {
        showAppointmentForm();
    }
}

function changeResourceSelection() {
    var selectedOids = [];
    var oidString = "";

    $("#resources-popup input:checked").each(function() {
        var id = $(this).attr("id");
        
        selectedOids.push(id.split("-")[0]);
    });

    for (var i = 0; i < selectedOids.length; i++) {
        oidString += selectedOids[i] + ",";
    }

    $.get(getSelectResourcesForAppointmentUrl(), { resourceOids: oidString }).done(updateSelectedResourceList);
}

function updateSelectedResourceList(jsonResult) {
    var list = $("#selected-resources-list");
    
    list.empty();

    if (isEmptyOrSpaces(jsonResult)) {
        return;
    }

    var resourceList = $.parseJSON(jsonResult);

    $.each(resourceList, function(index, customListItem) {
        var html =
            "<div class='list-group-item' id='relation-item-" + customListItem.ResourceOid + "'>" +
                "<div class='row'>" +
                    "<div class='col my-auto'>" +
                        "<i class='fas fa-cubes text-bewo-resource mr-2'></i>" + customListItem.Name +
                    "</div>" +
                    "<div class='col-auto my-auto'>" +
                        "<button type='button' class='btn btn-primary' onclick='removeSelectedResource(" + customListItem.ResourceOid + ")'>" +
                            "<span class='fas fa-times-circle'></span>" +
                        "</button>" +
                    "</div>" +
                "</div>" +
            "</div>";

        list.append(html);
    });
}

function removeSelectedResource(resourceOid) {
    $("#relation-item-" + resourceOid).remove();

    var checkbox = $("#" + resourceOid + "-checkbox");

    if (checkbox.length) {
        checkbox.prop("checked", false);
    }

    changeResourceSelection();
}