/**
 * @author Usman Naeem
 */
const send_invitation_form_id = "send_invitation_form";
const license_periods = new Array();

function enableSendInvitationPage() {
    addLoader();
    setPage("send_invitation_page");
    addHeader(true);
    addFooter();
    preventDefaultFormSubmit(send_invitation_form_id);
    const messageboxElement = getElement("send_invitation_message_box");
    messageboxElement.innerHTML = "";
    const inviteeEmailElement = getElement("invitee_email");
    inviteeEmailElement.value = "";

    load_user().then(() => {
        if (user_json.type !== 'Administrator') {
            enableHomePage();
        }

        //
        load_signup_duration_options().then(() => {
            removeLoader();
        }).catch((error) => {
            handleError(error, "send_invitation_message_box", true);
            return;
        });
    }).catch((error) => {
        handleError(error, "send_invitation_message_box", true);
        enableHomePage();
        return;
    });
}


async function load_signup_duration_options() {
    try {
        if(license_periods.length > 0) {
            return;
        }
        //license_periods.length = 0;
        const messageboxElement = getElement("send_invitation_message_box");
        const url = "/administration/GetLicensePeriodOptions";
        const json = await callWebserviceGET(url, messageboxElement, null);
        if (json.code !== 200) {
            messageboxElement.innerHTML = json.message;
        } else {
            json.license_periods.forEach(option => {
                if (!license_periods.includes(option)) {
                    license_periods.push(option);
                }
            });
            license_periods.sort((a, b) => {
                return (a - b);
            });

            const licensePeriodElement = getElement("license_period");
            licensePeriodElement.innerHTML = "";
            var selectedDone = false;
            license_periods.forEach(option => {
                var optionElement = document.createElement('option');
                optionElement.value = option;
                optionElement.innerHTML = option + " Day" + (option > 1 ? "s" : "");
                if (!selectedDone) {
                    optionElement.selected = true;
                    selectedDone = true;
                }
                licensePeriodElement.appendChild(optionElement);
            });
        }
    } catch (error) {
        console.log(error);
        throw new Error("Failed to load license period options");
    }
}

async function send_invitation() {
    try {
        const messageboxElement = getElement("send_invitation_message_box");
        messageboxElement.innerHTML = "";
        const inviteeEmailElement = getElement("invitee_email");
        if (inviteeEmailElement.value.trim() === "") {
            return;
        }

        const form_data = getFormData(send_invitation_form_id);
        disableOrEnableForm(send_invitation_form_id, true);
        const url = "administration/GenerateSignupInvitation";
        const json = await callWebservicePOST(url, form_data, messageboxElement, null);
        if (json.code !== 200) {
            messageboxElement.innerHTML = json.message;
        } else {
            messageboxElement.innerHTML = "Signup invitation has been generated for " + inviteeEmailElement.value;
        }
    } catch (error) {
        handleError("Failed to send invitation", "send_invitation_message_box");
    }
    disableOrEnableForm(send_invitation_form_id, false);
}