import $ from "jquery";

import render_admin_playground_list from "../templates/settings/admin_playground_list.hbs";

import * as channel from "./channel";
import {$t_html} from "./i18n";
import * as ListWidget from "./list_widget";
import {page_params} from "./page_params";
import * as realm_playground from "./realm_playground";
import * as ui from "./ui";
import * as ui_report from "./ui_report";

const meta = {
    loaded: false,
};

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

function compare_by_index(a, b, i) {
    if (a[i] > b[i]) {
        return 1;
    } else if (a[i] === b[i]) {
        return 0;
    }
    return -1;
}

function sort_pygments_language(a, b) {
    return compare_by_index(a, b, 0);
}

function sort_playground_name(a, b) {
    return compare_by_index(a, b, 1);
}

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

export function populate_playgrounds(playgrounds_data) {
    if (!meta.loaded) {
        return;
    }

    const playgrounds_table = $("#admin_playgrounds_table").expectOne();
    ListWidget.create(playgrounds_table, playgrounds_data, {
        name: "playgrounds_list",
        modifier(playground) {
            return render_admin_playground_list({
                playground: {
                    playground_name: playground.name,
                    pygments_language: playground.pygments_language,
                    url_prefix: playground.url_prefix,
                    id: playground.id,
                },
                can_modify: page_params.is_admin,
            });
        },
        filter: {
            element: playgrounds_table.closest(".settings-section").find(".search"),
            predicate(item, value) {
                return (
                    item.name.toLowerCase().includes(value) ||
                    item.pygments_language.toLowerCase().includes(value)
                );
            },
            onupdate() {
                ui.reset_scrollbar(playgrounds_table);
            },
        },
        parent_container: $("#playground-settings").expectOne(),
        init_sort: [sort_pygments_language],
        sort_fields: {
            pygments_language: sort_pygments_language,
            playground_name: sort_playground_name,
        },
        simplebar_container: $("#playground-settings .progressive-table-wrapper"),
    });
}

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

function build_page() {
    meta.loaded = true;
    populate_playgrounds(page_params.realm_playgrounds);

    $(".admin_playgrounds_table").on("click", ".delete", function (e) {
        e.preventDefault();
        e.stopPropagation();
        const btn = $(this);

        channel.del({
            url: "/json/realm/playgrounds/" + encodeURIComponent(btn.attr("data-playground-id")),
            error(xhr) {
                ui_report.generic_row_button_error(xhr, btn);
            },
            // There is no need for an on-success action here since the row is removed by the
            // `realm_playgrounds` events handler which builds the playground list again.
        });
    });

    $(".organization form.admin-playground-form")
        .off("submit")
        .on("submit", function (e) {
            e.preventDefault();
            e.stopPropagation();
            const playground_status = $("#admin-playground-status");
            const add_playground_button = $(".new-playground-form button");
            add_playground_button.prop("disabled", true);
            playground_status.hide();

            channel.post({
                url: "/json/realm/playgrounds",
                data: $(this).serialize(),
                success() {
                    $("#playground_pygments_language").val("");
                    $("#playground_name").val("");
                    $("#playground_url_prefix").val("");
                    add_playground_button.prop("disabled", false);
                    ui_report.success(
                        $t_html({defaultMessage: "Custom playground added!"}),
                        playground_status,
                        3000,
                    );
                    // FIXME: One thing to note here is that the "view code in playground"
                    // option for an already rendered code block (tagged with this newly added
                    // language) would not be visible without a re-render. To fix this, we should
                    // probably do some extraction in `rendered_markdown.js` which does a
                    // live-update of the `data-code-language` parameter in code blocks. Or change
                    // how we do the HTML in the frontend so that the icon labels/behavior are
                    // computed dynamically when you hover over the message based on configured
                    // playgrounds. Since this isn't high priority right now, we can probably
                    // take this up later.
                },
                error(xhr) {
                    add_playground_button.prop("disabled", false);
                    ui_report.error(
                        $t_html({defaultMessage: "Failed"}),
                        xhr,
                        playground_status,
                        3000,
                    );
                },
            });
        });

    const search_pygments_box = $("#playground_pygments_language");
    let language_labels = new Map();

    search_pygments_box.typeahead({
        source(query) {
            language_labels = realm_playground.get_pygments_typeahead_list(query);
            return Array.from(language_labels.keys());
        },
        items: 5,
        fixed: true,
        helpOnEmptyStrings: true,
        highlighter(item) {
            return language_labels.get(item);
        },
        matcher(item) {
            const q = this.query.trim().toLowerCase();
            return item.toLowerCase().startsWith(q);
        },
    });

    search_pygments_box.on("click", (e) => {
        search_pygments_box.typeahead("lookup").trigger("select");
        e.preventDefault();
        e.stopPropagation();
    });
}