import $ from "jquery";

import pygments_data from "../generated/pygments_data.json";
import render_settings_deactivate_realm_modal from "../templates/confirm_dialog/confirm_deactivate_realm.hbs";
import render_settings_admin_auth_methods_list from "../templates/settings/admin_auth_methods_list.hbs";
import render_settings_admin_realm_domains_list from "../templates/settings/admin_realm_domains_list.hbs";

import * as blueslip from "./blueslip";
import * as channel from "./channel";
import * as confirm_dialog from "./confirm_dialog";
import {csrf_token} from "./csrf";
import {DropdownListWidget} from "./dropdown_list_widget";
import {$t, $t_html} from "./i18n";
import * as loading from "./loading";
import * as overlays from "./overlays";
import {page_params} from "./page_params";
import * as realm_icon from "./realm_icon";
import * as realm_logo from "./realm_logo";
import {realm_user_settings_defaults} from "./realm_user_settings_defaults";
import * as settings_config from "./settings_config";
import * as settings_notifications from "./settings_notifications";
import * as settings_realm_user_settings_defaults from "./settings_realm_user_settings_defaults";
import * as settings_ui from "./settings_ui";
import * as stream_settings_data from "./stream_settings_data";
import * as ui_report from "./ui_report";

export let parse_time_limit;

const meta = {
    loaded: false,
};

export function reset() {
    meta.loaded = false;
}

export function maybe_disable_widgets() {
    if (page_params.is_owner) {
        return;
    }

    $(".organization-box [data-name='auth-methods']")
        .find("input, button, select, checked")
        .prop("disabled", true);

    if (page_params.is_admin) {
        $("#deactivate_realm_button").prop("disabled", true);
        $("#org-message-retention").find("input, select").prop("disabled", true);
        $("#id_realm_invite_to_realm_policy").prop("disabled", true);
        return;
    }

    $(".organization-box [data-name='organization-profile']")
        .find("input, textarea, button, select")
        .prop("disabled", true);

    $(".organization-box [data-name='organization-settings']")
        .find("input, textarea, button, select")
        .prop("disabled", true);

    $(".organization-box [data-name='organization-settings']")
        .find(".dropdown_list_reset_button")
        .hide();

    $(".organization-box [data-name='organization-settings']")
        .find(".control-label-disabled")
        .addClass("enabled");

    $(".organization-box [data-name='organization-permissions']")
        .find("input, textarea, button, select")
        .prop("disabled", true);

    $(".organization-box [data-name='organization-permissions']")
        .find(".control-label-disabled")
        .addClass("enabled");
}

export function get_sorted_options_list(option_values_object) {
    const options_list = Object.keys(option_values_object).map((key) => ({
        ...option_values_object[key],
        key,
    }));
    let comparator = (x, y) => x.order - y.order;
    if (!options_list[0].order) {
        comparator = (x, y) => {
            const key_x = x.key.toUpperCase();
            const key_y = y.key.toUpperCase();
            if (key_x < key_y) {
                return -1;
            }
            if (key_x > key_y) {
                return 1;
            }
            return 0;
        };
    }
    options_list.sort(comparator);
    return options_list;
}

export function get_organization_settings_options() {
    const options = {};
    options.common_policy_values = get_sorted_options_list(settings_config.common_policy_values);
    options.private_message_policy_values = get_sorted_options_list(
        settings_config.private_message_policy_values,
    );
    options.wildcard_mention_policy_values = get_sorted_options_list(
        settings_config.wildcard_mention_policy_values,
    );
    options.common_message_policy_values = get_sorted_options_list(
        settings_config.common_message_policy_values,
    );
    options.invite_to_realm_policy_values = get_sorted_options_list(
        settings_config.invite_to_realm_policy_values,
    );
    return options;
}

export function get_realm_time_limits_in_minutes(property) {
    let val = (page_params[property] / 60).toFixed(1);
    if (Number.parseFloat(val, 10) === Number.parseInt(val, 10)) {
        val = Number.parseInt(val, 10);
    }
    return val.toString();
}

function get_property_value(property_name, for_realm_default_settings) {
    if (for_realm_default_settings) {
        // realm_user_default_settings are stored in a separate object.
        if (property_name === "twenty_four_hour_time") {
            return JSON.stringify(realm_user_settings_defaults.twenty_four_hour_time);
        }
        if (
            property_name === "email_notifications_batching_period_seconds" ||
            property_name === "email_notification_batching_period_edit_minutes"
        ) {
            return realm_user_settings_defaults.email_notifications_batching_period_seconds;
        }
        return realm_user_settings_defaults[property_name];
    }

    if (property_name === "realm_message_content_edit_limit_minutes") {
        return get_realm_time_limits_in_minutes("realm_message_content_edit_limit_seconds");
    }

    if (property_name === "realm_message_content_delete_limit_minutes") {
        return get_realm_time_limits_in_minutes("realm_message_content_delete_limit_seconds");
    }

    if (property_name === "realm_waiting_period_setting") {
        if (page_params.realm_waiting_period_threshold === 0) {
            return "none";
        }
        if (page_params.realm_waiting_period_threshold === 3) {
            return "three_days";
        }
        return "custom_days";
    }

    if (property_name === "realm_msg_edit_limit_setting") {
        if (!page_params.realm_allow_message_editing) {
            return "never";
        }
        for (const [value, elem] of settings_config.msg_edit_limit_dropdown_values) {
            if (elem.seconds === page_params.realm_message_content_edit_limit_seconds) {
                return value;
            }
        }
        return "custom_limit";
    }

    if (property_name === "realm_message_retention_setting") {
        if (page_params.realm_message_retention_days === settings_config.retain_message_forever) {
            return "retain_forever";
        }
        return "retain_for_period";
    }

    if (property_name === "realm_msg_delete_limit_setting") {
        if (page_params.realm_message_content_delete_limit_seconds === null) {
            return "any_time";
        }
        for (const [value, elem] of settings_config.msg_delete_limit_dropdown_values) {
            if (elem.seconds === page_params.realm_message_content_delete_limit_seconds) {
                return value;
            }
        }
        return "custom_limit";
    }

    if (property_name === "realm_org_join_restrictions") {
        if (page_params.realm_emails_restricted_to_domains) {
            return "only_selected_domain";
        }
        if (page_params.realm_disallow_disposable_email_addresses) {
            return "no_disposable_email";
        }
        return "no_restriction";
    }

    return page_params[property_name];
}

export function extract_property_name(elem, for_realm_default_settings) {
    if (for_realm_default_settings) {
        // We use the name attribute, rather than the ID attribute,
        // for realm_user_default_settings. This is because the
        // display/notification settings elements do not always have
        // IDs, and also the emojiset input is not compatible with the
        // ID approach.
        return elem.attr("name");
    }
    return /^id_(.*)$/.exec(elem.attr("id").split("-").join("_"))[1];
}

function get_subsection_property_elements(element) {
    const subsection = $(element).closest(".org-subsection-parent");
    if (subsection.hasClass("theme-settings")) {
        // Because the emojiset widget has a unique radio button
        // structure, it needs custom code.
        const color_scheme_elem = subsection.find(".setting_color_scheme");
        const emojiset_elem = subsection.find("input[name='emojiset']:checked");
        const translate_emoticons_elem = subsection.find(".translate_emoticons");
        return [color_scheme_elem, emojiset_elem, translate_emoticons_elem];
    }
    return Array.from(subsection.find(".prop-element"));
}

const simple_dropdown_properties = [
    "realm_create_private_stream_policy",
    "realm_create_public_stream_policy",
    "realm_create_web_public_stream_policy",
    "realm_invite_to_stream_policy",
    "realm_user_group_edit_policy",
    "realm_private_message_policy",
    "realm_add_custom_emoji_policy",
    "realm_invite_to_realm_policy",
    "realm_wildcard_mention_policy",
    "realm_move_messages_between_streams_policy",
    "realm_edit_topic_policy",
];

function set_property_dropdown_value(property_name) {
    $(`#id_${CSS.escape(property_name)}`).val(get_property_value(property_name));
}

export function change_element_block_display_property(elem_id, show_element) {
    const elem = $(`#${CSS.escape(elem_id)}`);
    if (show_element) {
        elem.parent().show();
    } else {
        elem.parent().hide();
    }
}

function set_realm_waiting_period_dropdown() {
    const value = get_property_value("realm_waiting_period_setting");
    $("#id_realm_waiting_period_setting").val(value);
    change_element_block_display_property(
        "id_realm_waiting_period_threshold",
        value === "custom_days",
    );
}

function set_video_chat_provider_dropdown() {
    const chat_provider_id = page_params.realm_video_chat_provider;
    $("#id_realm_video_chat_provider").val(chat_provider_id);
}

function set_giphy_rating_dropdown() {
    const rating_id = page_params.realm_giphy_rating;
    $("#id_realm_giphy_rating").val(rating_id);
}

function set_msg_edit_limit_dropdown() {
    const value = get_property_value("realm_msg_edit_limit_setting");
    $("#id_realm_msg_edit_limit_setting").val(value);
    change_element_block_display_property(
        "id_realm_message_content_edit_limit_minutes",
        value === "custom_limit",
    );
    settings_ui.disable_sub_setting_onchange(value !== "never", "id_realm_edit_topic_policy", true);
}

function message_delete_limit_setting_enabled() {
    // This function is used to check whether the time-limit setting
    // should be enabled. The setting is disabled when delete_own_message_policy
    // is set to 'admins only' as admins can delete messages irrespective of
    // time limit.
    if (
        page_params.realm_delete_own_message_policy ===
        settings_config.common_message_policy_values.by_admins_only.code
    ) {
        return false;
    }
    return true;
}

function set_delete_own_message_policy_dropdown() {
    const value = get_property_value("realm_delete_own_message_policy");
    $("#id_realm_delete_own_message_policy").val(value);
    settings_ui.disable_sub_setting_onchange(
        message_delete_limit_setting_enabled(),
        "id_realm_msg_delete_limit_setting",
        true,
    );
    const limit_value = get_property_value("realm_msg_delete_limit_setting");
    if (limit_value === "custom_limit") {
        settings_ui.disable_sub_setting_onchange(
            message_delete_limit_setting_enabled(),
            "id_realm_message_content_delete_limit_minutes",
            true,
        );
    }
}

function set_msg_delete_limit_dropdown() {
    const value = get_property_value("realm_msg_delete_limit_setting");
    $("#id_realm_msg_delete_limit_setting").val(value);
    change_element_block_display_property(
        "id_realm_message_content_delete_limit_minutes",
        value === "custom_limit",
    );
}

function set_message_retention_setting_dropdown() {
    const value = get_property_value("realm_message_retention_setting");
    $("#id_realm_message_retention_setting").val(value);
    change_element_block_display_property(
        "id_realm_message_retention_days",
        value === "retain_for_period",
    );
    if (
        get_property_value("realm_message_retention_days") ===
        settings_config.retain_message_forever
    ) {
        $("#id_realm_message_retention_days").val("");
    }
}

function set_org_join_restrictions_dropdown() {
    const value = get_property_value("realm_org_join_restrictions");
    $("#id_realm_org_join_restrictions").val(value);
    change_element_block_display_property(
        "allowed_domains_label",
        value === "only_selected_domain",
    );
}

function set_message_content_in_email_notifications_visiblity() {
    change_element_block_display_property(
        "message_content_in_email_notifications_label",
        page_params.realm_message_content_allowed_in_email_notifications,
    );
}

function set_digest_emails_weekday_visibility() {
    change_element_block_display_property(
        "id_realm_digest_weekday",
        page_params.realm_digest_emails_enabled,
    );
}

function set_create_web_public_stream_dropdown_visibility() {
    change_element_block_display_property(
        "id_realm_create_web_public_stream_policy",
        page_params.server_web_public_streams_enabled && page_params.realm_enable_spectator_access,
    );
}

export function populate_realm_domains(realm_domains) {
    if (!meta.loaded) {
        return;
    }

    const domains_list = realm_domains.map((realm_domain) =>
        realm_domain.allow_subdomains ? "*." + realm_domain.domain : realm_domain.domain,
    );
    let domains = domains_list.join(", ");
    if (domains.length === 0) {
        domains = $t({defaultMessage: "None"});
    }
    $("#allowed_domains_label").text($t({defaultMessage: "Allowed domains: {domains}"}, {domains}));

    const realm_domains_table_body = $("#realm_domains_table tbody").expectOne();
    realm_domains_table_body.find("tr").remove();

    for (const realm_domain of realm_domains) {
        realm_domains_table_body.append(
            render_settings_admin_realm_domains_list({
                realm_domain,
            }),
        );
    }
}

function sort_object_by_key(obj) {
    const keys = Object.keys(obj).sort();
    const new_obj = {};

    for (const key of keys) {
        new_obj[key] = obj[key];
    }

    return new_obj;
}

export function populate_auth_methods(auth_methods) {
    if (!meta.loaded) {
        return;
    }
    const auth_methods_table = $("#id_realm_authentication_methods").expectOne();
    auth_methods = sort_object_by_key(auth_methods);
    let rendered_auth_method_rows = "";
    for (const [auth_method, value] of Object.entries(auth_methods)) {
        rendered_auth_method_rows += render_settings_admin_auth_methods_list({
            method: auth_method,
            enabled: value,
            is_owner: page_params.is_owner,
        });
    }
    auth_methods_table.html(rendered_auth_method_rows);
}

function update_dependent_subsettings(property_name) {
    if (simple_dropdown_properties.includes(property_name)) {
        set_property_dropdown_value(property_name);
        return;
    }

    switch (property_name) {
        case "realm_waiting_period_threshold":
            set_realm_waiting_period_dropdown();
            break;
        case "realm_video_chat_provider":
            set_video_chat_provider_dropdown();
            break;
        case "realm_msg_edit_limit_setting":
        case "realm_message_content_edit_limit_minutes":
            set_msg_edit_limit_dropdown();
            break;
        case "realm_message_retention_days":
            set_message_retention_setting_dropdown();
            break;
        case "realm_msg_delete_limit_setting":
        case "realm_message_content_delete_limit_minutes":
            set_msg_delete_limit_dropdown();
            break;
        case "realm_delete_own_message_policy":
            set_delete_own_message_policy_dropdown();
            break;
        case "realm_org_join_restrictions":
            set_org_join_restrictions_dropdown();
            break;
        case "realm_message_content_allowed_in_email_notifications":
            set_message_content_in_email_notifications_visiblity();
            break;
        case "realm_digest_emails_enabled":
            settings_notifications.set_enable_digest_emails_visibility(
                settings_notifications.user_settings_panel,
            );
            settings_notifications.set_enable_digest_emails_visibility(
                settings_realm_user_settings_defaults.realm_default_settings_panel,
            );
            set_digest_emails_weekday_visibility();
            break;
        case "realm_enable_spectator_access":
            set_create_web_public_stream_dropdown_visibility();
            break;
    }
}

export let default_code_language_widget = null;
export let notifications_stream_widget = null;
export let signup_notifications_stream_widget = null;

function discard_property_element_changes(elem, for_realm_default_settings) {
    elem = $(elem);
    const property_name = extract_property_name(elem, for_realm_default_settings);
    const property_value = get_property_value(property_name, for_realm_default_settings);

    switch (property_name) {
        case "realm_authentication_methods":
            populate_auth_methods(property_value);
            break;
        case "realm_notifications_stream_id":
            notifications_stream_widget.render(property_value);
            break;
        case "realm_signup_notifications_stream_id":
            signup_notifications_stream_widget.render(property_value);
            break;
        case "realm_default_code_block_language":
            default_code_language_widget.render(property_value);
            break;
        case "emojiset":
            // Because the emojiset widget has a unique radio button
            // structure, it needs custom reset code.
            elem.closest(".org-subsection-parent")
                .find(`.setting_emojiset_choice[value='${CSS.escape(property_value)}'`)
                .prop("checked", true);
            break;
        case "email_notifications_batching_period_seconds":
        case "email_notification_batching_period_edit_minutes":
            settings_notifications.set_notification_batching_ui(
                $("#realm-user-default-settings"),
                realm_user_settings_defaults.email_notifications_batching_period_seconds,
            );
            break;
        default:
            if (property_value !== undefined) {
                set_input_element_value(elem, property_value);
            } else {
                blueslip.error("Element refers to unknown property " + property_name);
            }
    }

    update_dependent_subsettings(property_name);
}

export function sync_realm_settings(property) {
    if (!overlays.settings_open()) {
        return;
    }

    const value = page_params[`realm_${property}`];
    switch (property) {
        case "notifications_stream_id":
            notifications_stream_widget.render(value);
            break;
        case "signup_notifications_stream_id":
            signup_notifications_stream_widget.render(value);
            break;
        case "default_code_block_language":
            default_code_language_widget.render(value);
            break;
    }

    switch (property) {
        case "message_content_edit_limit_seconds":
            property = "message_content_edit_limit_minutes";
            break;
        case "allow_message_editing":
            property = "msg_edit_limit_setting";
            break;
        case "emails_restricted_to_domains":
        case "disallow_disposable_email_addresses":
            property = "org_join_restrictions";
            break;
        case "message_content_delete_limit_seconds":
            property = "message_content_delete_limit_minutes";
            break;
    }
    const element = $(`#id_realm_${CSS.escape(property)}`);
    if (element.length) {
        discard_property_element_changes(element);
    }
}

export function change_save_button_state($element, state) {
    function show_hide_element($element, show, fadeout_delay) {
        if (show) {
            $element.removeClass("hide").addClass(".show").fadeIn(300);
            return;
        }
        setTimeout(() => {
            $element.fadeOut(300);
        }, fadeout_delay);
    }

    const $saveBtn = $element.find(".save-button");
    const $textEl = $saveBtn.find(".save-discard-widget-button-text");

    if (state !== "saving") {
        $saveBtn.removeClass("saving");
    }

    if (state === "discarded") {
        show_hide_element($element, false, 0);
        return;
    }

    let button_text;
    let data_status;
    let is_show;
    switch (state) {
        case "unsaved":
            button_text = $t({defaultMessage: "Save changes"});
            data_status = "unsaved";
            is_show = true;

            $element.find(".discard-button").show();
            break;
        case "saved":
            button_text = $t({defaultMessage: "Save changes"});
            data_status = "";
            is_show = false;
            break;
        case "saving":
            button_text = $t({defaultMessage: "Saving"});
            data_status = "saving";
            is_show = true;

            $element.find(".discard-button").hide();
            $saveBtn.addClass("saving");
            break;
        case "failed":
            button_text = $t({defaultMessage: "Save changes"});
            data_status = "failed";
            is_show = true;
            break;
        case "succeeded":
            button_text = $t({defaultMessage: "Saved"});
            data_status = "saved";
            is_show = false;
            break;
    }

    $textEl.text(button_text);
    $saveBtn.attr("data-status", data_status);
    show_hide_element($element, is_show, 800);
}

export function save_organization_settings(data, save_button, patch_url) {
    const subsection_parent = save_button.closest(".org-subsection-parent");
    const save_btn_container = subsection_parent.find(".save-button-controls");
    const failed_alert_elem = subsection_parent.find(".subsection-failed-status p");
    change_save_button_state(save_btn_container, "saving");
    channel.patch({
        url: patch_url,
        data,
        success() {
            failed_alert_elem.hide();
            change_save_button_state(save_btn_container, "succeeded");
        },
        error(xhr) {
            change_save_button_state(save_btn_container, "failed");
            save_button.hide();
            ui_report.error($t_html({defaultMessage: "Save failed"}), xhr, failed_alert_elem);
        },
    });
}

function get_input_type(input_elem, input_type) {
    if (["boolean", "string", "number"].includes(input_type)) {
        return input_type;
    }
    return input_elem.data("setting-widget-type");
}

export function get_input_element_value(input_elem, input_type) {
    input_elem = $(input_elem);
    input_type = get_input_type(input_elem, input_type);
    switch (input_type) {
        case "boolean":
            return input_elem.prop("checked");
        case "string":
            return input_elem.val().trim();
        case "number":
            return Number.parseInt(input_elem.val().trim(), 10);
        case "radio-group":
            if (input_elem.prop("checked")) {
                return input_elem.val().trim();
            }
            return undefined;
        default:
            return undefined;
    }
}

export function set_input_element_value(input_elem, value) {
    const input_type = get_input_type(input_elem, typeof value);
    if (input_type) {
        if (input_type === "boolean") {
            return input_elem.prop("checked", value);
        } else if (input_type === "string" || input_type === "number") {
            return input_elem.val(value);
        }
    }
    blueslip.error(`Failed to set value of property ${extract_property_name(input_elem)}`);
    return undefined;
}

export function set_up() {
    build_page();
    maybe_disable_widgets();
}

function get_auth_method_table_data() {
    const new_auth_methods = {};
    const auth_method_rows = $("#id_realm_authentication_methods").find("tr.method_row");

    for (const method_row of auth_method_rows) {
        new_auth_methods[$(method_row).data("method")] = $(method_row)
            .find("input")
            .prop("checked");
    }

    return new_auth_methods;
}

function get_email_notification_batching_setting_element_value() {
    const select_elem_val = $("#realm-user-default-settings")
        .find(".setting_email_notifications_batching_period_seconds")
        .val();
    if (select_elem_val !== "custom_period") {
        return Number.parseInt(select_elem_val, 10);
    }
    const edit_elem_val = $("#realm_email_notification_batching_period_edit_minutes").val();
    const setting_value_in_minutes = Number.parseInt(edit_elem_val, 10);
    return setting_value_in_minutes * 60;
}

function check_property_changed(elem, for_realm_default_settings) {
    elem = $(elem);
    const property_name = extract_property_name(elem, for_realm_default_settings);
    let current_val = get_property_value(property_name, for_realm_default_settings);
    let changed_val;

    switch (property_name) {
        case "realm_authentication_methods":
            current_val = sort_object_by_key(current_val);
            current_val = JSON.stringify(current_val);
            changed_val = get_auth_method_table_data();
            changed_val = JSON.stringify(changed_val);
            break;
        case "realm_notifications_stream_id":
            changed_val = Number.parseInt(notifications_stream_widget.value(), 10);
            break;
        case "realm_signup_notifications_stream_id":
            changed_val = Number.parseInt(signup_notifications_stream_widget.value(), 10);
            break;
        case "realm_default_code_block_language":
            changed_val = default_code_language_widget.value();
            break;
        case "email_notifications_batching_period_seconds":
        case "email_notification_batching_period_edit_minutes": {
            changed_val = get_email_notification_batching_setting_element_value();
            break;
        }
        default:
            if (current_val !== undefined) {
                changed_val = get_input_element_value(elem, typeof current_val);
            } else {
                blueslip.error("Element refers to unknown property " + property_name);
            }
    }
    return current_val !== changed_val;
}

export function save_discard_widget_status_handler(subsection, for_realm_default_settings) {
    subsection.find(".subsection-failed-status p").hide();
    subsection.find(".save-button").show();
    const properties_elements = get_subsection_property_elements(subsection);
    const show_change_process_button = properties_elements.some((elem) =>
        check_property_changed(elem, for_realm_default_settings),
    );

    const save_btn_controls = subsection.find(".subsection-header .save-button-controls");
    const button_state = show_change_process_button ? "unsaved" : "discarded";
    change_save_button_state(save_btn_controls, button_state);
}

export function init_dropdown_widgets() {
    const streams = stream_settings_data.get_streams_for_settings_page();
    const notification_stream_options = {
        data: streams.map((x) => ({
            name: x.name,
            value: x.stream_id.toString(),
        })),
        on_update: () => {
            save_discard_widget_status_handler($("#org-notifications"));
        },
        default_text: $t({defaultMessage: "Disabled"}),
        render_text: (x) => `#${x}`,
        null_value: -1,
    };
    notifications_stream_widget = new DropdownListWidget({
        widget_name: "realm_notifications_stream_id",
        value: page_params.realm_notifications_stream_id,
        ...notification_stream_options,
    });
    signup_notifications_stream_widget = new DropdownListWidget({
        widget_name: "realm_signup_notifications_stream_id",
        value: page_params.realm_signup_notifications_stream_id,
        ...notification_stream_options,
    });
    default_code_language_widget = new DropdownListWidget({
        widget_name: "realm_default_code_block_language",
        data: Object.keys(pygments_data.langs).map((x) => ({
            name: x,
            value: x,
        })),
        value: page_params.realm_default_code_block_language,
        on_update: () => {
            save_discard_widget_status_handler($("#org-other-settings"));
        },
        default_text: $t({defaultMessage: "No language set"}),
    });
}

export function register_save_discard_widget_handlers(
    container,
    patch_url,
    for_realm_default_settings,
) {
    container.on("change input", "input, select, textarea", (e) => {
        e.preventDefault();
        e.stopPropagation();

        // This event handler detects whether after these input
        // changes, any fields have different values from the current
        // official values stored in the database and page_params.  If
        // they do, we transition to the "unsaved" state showing the
        // save/discard widget; otherwise, we hide that widget (the
        // "discarded" state).

        if ($(e.target).hasClass("no-input-change-detection")) {
            // This is to prevent input changes detection in elements
            // within a subsection whose changes should not affect the
            // visibility of the discard button
            return false;
        }

        if ($(e.target).hasClass("setting_email_notifications_batching_period_seconds")) {
            const show_elem = $(e.target).val() === "custom_period";
            change_element_block_display_property(
                "realm_email_notification_batching_period_edit_minutes",
                show_elem,
            );
        }

        const subsection = $(e.target).closest(".org-subsection-parent");
        save_discard_widget_status_handler(subsection, for_realm_default_settings);
        return undefined;
    });

    container.on("click", ".subsection-header .subsection-changes-discard button", (e) => {
        e.preventDefault();
        e.stopPropagation();
        for (const elem of get_subsection_property_elements(e.target)) {
            discard_property_element_changes(elem, for_realm_default_settings);
        }
        const save_btn_controls = $(e.target).closest(".save-button-controls");
        change_save_button_state(save_btn_controls, "discarded");
    });

    parse_time_limit = function parse_time_limit(elem) {
        return Math.floor(Number.parseFloat(elem.val(), 10).toFixed(1) * 60);
    };

    function get_complete_data_for_subsection(subsection) {
        let data = {};

        switch (subsection) {
            case "msg_editing": {
                const edit_limit_setting_value = $("#id_realm_msg_edit_limit_setting").val();
                if (edit_limit_setting_value === "never") {
                    data.allow_message_editing = false;
                } else if (edit_limit_setting_value === "custom_limit") {
                    data.message_content_edit_limit_seconds = parse_time_limit(
                        $("#id_realm_message_content_edit_limit_minutes"),
                    );
                    // Disable editing if the parsed time limit is 0 seconds
                    data.allow_message_editing = Boolean(data.message_content_edit_limit_seconds);
                } else {
                    data.allow_message_editing = true;
                    data.message_content_edit_limit_seconds =
                        settings_config.msg_edit_limit_dropdown_values.get(
                            edit_limit_setting_value,
                        ).seconds;
                }
                const delete_limit_setting_value = $("#id_realm_msg_delete_limit_setting").val();
                switch (delete_limit_setting_value) {
                    case "any_time": {
                        data.message_content_delete_limit_seconds = JSON.stringify("unlimited");

                        break;
                    }
                    case "custom_limit": {
                        data.message_content_delete_limit_seconds = parse_time_limit(
                            $("#id_realm_message_content_delete_limit_minutes"),
                        );

                        break;
                    }
                    default: {
                        data.message_content_delete_limit_seconds =
                            settings_config.msg_delete_limit_dropdown_values.get(
                                delete_limit_setting_value,
                            ).seconds;
                    }
                }
                data.delete_own_message_policy = $("#id_realm_delete_own_message_policy").val();
                break;
            }
            case "notifications":
                data.notifications_stream_id = Number.parseInt(
                    notifications_stream_widget.value(),
                    10,
                );
                data.signup_notifications_stream_id = Number.parseInt(
                    signup_notifications_stream_widget.value(),
                    10,
                );
                break;
            case "message_retention": {
                const message_retention_setting_value = $(
                    "#id_realm_message_retention_setting",
                ).val();
                if (message_retention_setting_value === "retain_forever") {
                    data.message_retention_days = JSON.stringify("unlimited");
                } else {
                    data.message_retention_days = JSON.stringify(
                        get_input_element_value($("#id_realm_message_retention_days")),
                    );
                }
                break;
            }
            case "other_settings": {
                const code_block_language_value = default_code_language_widget.value();
                // No need to JSON-encode, since this value is already a string.
                data.default_code_block_language = code_block_language_value;
                break;
            }
            case "org_join": {
                const org_join_restrictions = $("#id_realm_org_join_restrictions").val();
                switch (org_join_restrictions) {
                    case "only_selected_domain":
                        data.emails_restricted_to_domains = true;
                        data.disallow_disposable_email_addresses = false;
                        break;
                    case "no_disposable_email":
                        data.emails_restricted_to_domains = false;
                        data.disallow_disposable_email_addresses = true;
                        break;
                    case "no_restriction":
                        data.disallow_disposable_email_addresses = false;
                        data.emails_restricted_to_domains = false;
                        break;
                }

                const waiting_period_threshold = $("#id_realm_waiting_period_setting").val();
                switch (waiting_period_threshold) {
                    case "none":
                        data.waiting_period_threshold = 0;
                        break;
                    case "three_days":
                        data.waiting_period_threshold = 3;
                        break;
                    case "custom_days":
                        data.waiting_period_threshold = $(
                            "#id_realm_waiting_period_threshold",
                        ).val();
                        break;
                }
                break;
            }
            case "auth_settings":
                data = {};
                data.authentication_methods = JSON.stringify(get_auth_method_table_data());
                break;
        }
        return data;
    }

    function populate_data_for_request(subsection) {
        const data = {};
        const properties_elements = get_subsection_property_elements(subsection);

        for (let input_elem of properties_elements) {
            input_elem = $(input_elem);
            if (check_property_changed(input_elem, for_realm_default_settings)) {
                if (
                    input_elem.hasClass("email_notification_batching_period_edit_minutes") ||
                    input_elem.hasClass("setting_email_notifications_batching_period_seconds")
                ) {
                    const setting_value = get_email_notification_batching_setting_element_value();
                    data.email_notifications_batching_period_seconds = setting_value;
                    continue;
                }
                const input_value = get_input_element_value(input_elem);
                if (input_value !== undefined) {
                    let property_name;
                    if (for_realm_default_settings) {
                        // We use the name attribute, rather than the ID attribute,
                        // for realm_user_default_settings. This is because the
                        // display/notification settings elements do not always have
                        // IDs, and also the emojiset input is not compatible with the
                        // ID approach.
                        property_name = input_elem.attr("name");
                    } else {
                        [, property_name] = /^id_realm_(.*)$/.exec(input_elem.attr("id"));
                    }
                    data[property_name] = input_value;
                }
            }
        }

        return data;
    }

    container.on("click", ".subsection-header .subsection-changes-save button", (e) => {
        e.preventDefault();
        e.stopPropagation();
        const save_button = $(e.currentTarget);
        const subsection_elem = save_button.closest(".org-subsection-parent");
        let extra_data = {};

        if (!for_realm_default_settings) {
            // The organization settings system has some coupled
            // fields that must be submitted together, which is
            // managed by the get_complete_data_for_subsection function.
            const [, subsection_id] = /^org-submit-(.*)$/.exec(save_button.attr("id"));
            const subsection = subsection_id.split("-").join("_");
            extra_data = get_complete_data_for_subsection(subsection);
        }

        const data = {
            ...populate_data_for_request(subsection_elem),
            ...extra_data,
        };
        save_organization_settings(data, save_button, patch_url);
    });
}

export function build_page() {
    meta.loaded = true;

    loading.make_indicator($("#admin_page_auth_methods_loading_indicator"));

    // Initialize all the dropdown list widgets.
    init_dropdown_widgets();
    // Populate realm domains
    populate_realm_domains(page_params.realm_domains);

    // Populate authentication methods table
    populate_auth_methods(page_params.realm_authentication_methods);

    for (const property_name of simple_dropdown_properties) {
        set_property_dropdown_value(property_name);
    }

    set_realm_waiting_period_dropdown();
    set_video_chat_provider_dropdown();
    set_giphy_rating_dropdown();
    set_msg_edit_limit_dropdown();
    set_msg_delete_limit_dropdown();
    set_delete_own_message_policy_dropdown();
    set_message_retention_setting_dropdown();
    set_org_join_restrictions_dropdown();
    set_message_content_in_email_notifications_visiblity();
    set_digest_emails_weekday_visibility();
    set_create_web_public_stream_dropdown_visibility();

    register_save_discard_widget_handlers($(".admin-realm-form"), "/json/realm", false);

    $(".org-subsection-parent").on("keydown", "input", (e) => {
        e.stopPropagation();
        if (e.key === "Enter") {
            e.preventDefault();
            $(e.target)
                .closest(".org-subsection-parent")
                .find(".subsection-changes-save button")
                .trigger("click");
        }
    });

    $("#id_realm_msg_edit_limit_setting").on("change", (e) => {
        const msg_edit_limit_dropdown_value = e.target.value;
        change_element_block_display_property(
            "id_realm_message_content_edit_limit_minutes",
            msg_edit_limit_dropdown_value === "custom_limit",
        );
    });

    $("#id_realm_msg_delete_limit_setting").on("change", (e) => {
        const msg_delete_limit_dropdown_value = e.target.value;
        change_element_block_display_property(
            "id_realm_message_content_delete_limit_minutes",
            msg_delete_limit_dropdown_value === "custom_limit",
        );
    });

    $("#id_realm_message_retention_setting").on("change", (e) => {
        const message_retention_setting_dropdown_value = e.target.value;
        change_element_block_display_property(
            "id_realm_message_retention_days",
            message_retention_setting_dropdown_value === "retain_for_period",
        );
    });

    $("#id_realm_waiting_period_setting").on("change", function () {
        const waiting_period_threshold = this.value;
        change_element_block_display_property(
            "id_realm_waiting_period_threshold",
            waiting_period_threshold === "custom_days",
        );
    });

    $("#id_realm_digest_emails_enabled").on("change", (e) => {
        const digest_emails_enabled = $(e.target).is(":checked");
        change_element_block_display_property(
            "id_realm_digest_weekday",
            digest_emails_enabled === true,
        );
    });

    $("#id_realm_org_join_restrictions").on("change", (e) => {
        const org_join_restrictions = e.target.value;
        const node = $("#allowed_domains_label").parent();
        if (org_join_restrictions === "only_selected_domain") {
            node.show();
            if (page_params.realm_domains.length === 0) {
                overlays.open_modal("#realm_domains_modal");
            }
        } else {
            node.hide();
        }
    });

    $("#id_realm_org_join_restrictions").on("click", (e) => {
        // This prevents the disappearance of modal when there are
        // no allowed domains otherwise it gets closed due to
        // the click event handler attached to `#settings_overlay_container`
        e.stopPropagation();
    });

    function fade_status_element(elem) {
        setTimeout(() => {
            elem.fadeOut(500);
        }, 1000);
    }

    $("#realm_domains_table").on("click", ".delete_realm_domain", function () {
        const domain = $(this).parents("tr").find(".domain").text();
        const url = "/json/realm/domains/" + domain;
        const realm_domains_info = $(".realm_domains_info");

        channel.del({
            url,
            success() {
                ui_report.success(
                    $t_html({defaultMessage: "Deleted successfully!"}),
                    realm_domains_info,
                );
                fade_status_element(realm_domains_info);
            },
            error(xhr) {
                ui_report.error($t_html({defaultMessage: "Failed"}), xhr, realm_domains_info);
                fade_status_element(realm_domains_info);
            },
        });
    });

    $("#submit-add-realm-domain").on("click", () => {
        const realm_domains_info = $(".realm_domains_info");
        const widget = $("#add-realm-domain-widget");
        const domain = widget.find(".new-realm-domain").val();
        const allow_subdomains = widget.find(".new-realm-domain-allow-subdomains").prop("checked");
        const data = {
            domain,
            allow_subdomains: JSON.stringify(allow_subdomains),
        };

        channel.post({
            url: "/json/realm/domains",
            data,
            success() {
                $("#add-realm-domain-widget .new-realm-domain").val("");
                $("#add-realm-domain-widget .new-realm-domain-allow-subdomains").prop(
                    "checked",
                    false,
                );
                ui_report.success(
                    $t_html({defaultMessage: "Added successfully!"}),
                    realm_domains_info,
                );
                fade_status_element(realm_domains_info);
            },
            error(xhr) {
                ui_report.error($t_html({defaultMessage: "Failed"}), xhr, realm_domains_info);
                fade_status_element(realm_domains_info);
            },
        });
    });

    $("#realm_domains_table").on("change", ".allow-subdomains", function (e) {
        e.stopPropagation();
        const realm_domains_info = $(".realm_domains_info");
        const domain = $(this).parents("tr").find(".domain").text();
        const allow_subdomains = $(this).prop("checked");
        const url = "/json/realm/domains/" + domain;
        const data = {
            allow_subdomains: JSON.stringify(allow_subdomains),
        };

        channel.patch({
            url,
            data,
            success() {
                if (allow_subdomains) {
                    ui_report.success(
                        $t_html(
                            {defaultMessage: "Update successful: Subdomains allowed for {domain}"},
                            {domain},
                        ),
                        realm_domains_info,
                    );
                } else {
                    ui_report.success(
                        $t_html(
                            {
                                defaultMessage:
                                    "Update successful: Subdomains no longer allowed for {domain}",
                            },
                            {domain},
                        ),
                        realm_domains_info,
                    );
                }
                fade_status_element(realm_domains_info);
            },
            error(xhr) {
                ui_report.error($t_html({defaultMessage: "Failed"}), xhr, realm_domains_info);
                fade_status_element(realm_domains_info);
            },
        });
    });

    function realm_icon_logo_upload_complete(spinner, upload_text, delete_button) {
        spinner.css({visibility: "hidden"});
        upload_text.show();
        delete_button.show();
    }

    function realm_icon_logo_upload_start(spinner, upload_text, delete_button) {
        spinner.css({visibility: "visible"});
        upload_text.hide();
        delete_button.hide();
    }

    function upload_realm_logo_or_icon(file_input, night, icon) {
        const form_data = new FormData();
        let widget;
        let url;

        form_data.append("csrfmiddlewaretoken", csrf_token);
        for (const [i, file] of Array.prototype.entries.call(file_input[0].files)) {
            form_data.append("file-" + i, file);
        }
        if (icon) {
            url = "/json/realm/icon";
            widget = "#realm-icon-upload-widget";
        } else {
            if (night) {
                widget = "#realm-night-logo-upload-widget";
            } else {
                widget = "#realm-day-logo-upload-widget";
            }
            url = "/json/realm/logo";
            form_data.append("night", JSON.stringify(night));
        }
        const spinner = $(`${widget} .upload-spinner-background`).expectOne();
        const upload_text = $(`${widget}  .image-upload-text`).expectOne();
        const delete_button = $(`${widget}  .image-delete-button`).expectOne();
        const error_field = $(`${widget}  .image_file_input_error`).expectOne();
        realm_icon_logo_upload_start(spinner, upload_text, delete_button);
        error_field.hide();
        channel.post({
            url,
            data: form_data,
            cache: false,
            processData: false,
            contentType: false,
            success() {
                realm_icon_logo_upload_complete(spinner, upload_text, delete_button);
            },
            error(xhr) {
                realm_icon_logo_upload_complete(spinner, upload_text, delete_button);
                ui_report.error("", xhr, error_field);
            },
        });
    }

    realm_icon.build_realm_icon_widget(upload_realm_logo_or_icon, null, true);
    if (page_params.zulip_plan_is_not_limited) {
        realm_logo.build_realm_logo_widget(upload_realm_logo_or_icon, false);
        realm_logo.build_realm_logo_widget(upload_realm_logo_or_icon, true);
    }

    $("#deactivate_realm_button").on("click", (e) => {
        e.preventDefault();
        e.stopPropagation();

        function do_deactivate_realm() {
            channel.post({
                url: "/json/realm/deactivate",
                error(xhr) {
                    ui_report.error(
                        $t_html({defaultMessage: "Failed"}),
                        xhr,
                        $("#admin-realm-deactivation-status").expectOne(),
                    );
                },
            });
        }

        const html_body = render_settings_deactivate_realm_modal();

        confirm_dialog.launch({
            html_heading: $t_html({defaultMessage: "Deactivate organization"}),
            help_link: "/help/deactivate-your-organization",
            html_body,
            on_click: do_deactivate_realm,
        });
    });
}