const render_alert_word_settings_item = require('../templates/settings/alert_word_settings_item.hbs');

exports.render_alert_words_ui = function () {
    const words = alert_words.get_word_list();
    words.sort();
    const word_list = $('#alert_words_list');

    word_list.find('.alert-word-item').remove();

    for (const alert_word of words) {
        const rendered_alert_word = render_alert_word_settings_item({
            word: alert_word,
        });
        word_list.append(rendered_alert_word);
    }

    // Focus new alert word name text box.
    $('#create_alert_word_name').focus();
};

function update_alert_word_status(status_text, is_error) {
    const alert_word_status = $('#alert_word_status');
    if (is_error) {
        alert_word_status.removeClass('alert-success').addClass('alert-danger');
    } else {
        alert_word_status.removeClass('alert-danger').addClass('alert-success');
    }
    alert_word_status.find('.alert_word_status_text').text(status_text);
    alert_word_status.show();
}

function add_alert_word(alert_word) {
    alert_word = $.trim(alert_word);
    if (alert_word === '') {
        update_alert_word_status(i18n.t("Alert word can't be empty!"), true);
        return;
    } else if (alert_words.has_alert_word(alert_word)) {
        update_alert_word_status(i18n.t("Alert word already exists!"), true);
        return;
    }

    const words_to_be_added = [alert_word];

    channel.post({
        url: '/json/users/me/alert_words',
        data: {alert_words: JSON.stringify(words_to_be_added)},
        success: function () {
            const message = i18n.t('Alert word "__word__" added successfully!',
                                   {word: words_to_be_added[0]});
            update_alert_word_status(message, false);
            $('#create_alert_word_name').val('');
        },
        error: function () {
            update_alert_word_status(i18n.t("Error adding alert word!"), true);
        },
    });
}

function remove_alert_word(alert_word) {
    const words_to_be_removed = [alert_word];

    channel.del({
        url: '/json/users/me/alert_words',
        data: {alert_words: JSON.stringify(words_to_be_removed)},
        success: function () {
            update_alert_word_status(i18n.t("Alert word removed successfully!"), false);
        },
        error: function () {
            update_alert_word_status(i18n.t("Error removing alert word!"), true);
        },
    });
}

exports.set_up_alert_words = function () {
    // The settings page must be rendered before this function gets called.

    exports.render_alert_words_ui();

    $('#create_alert_word_form').on('click', '#create_alert_word_button', () => {
        const word = $('#create_alert_word_name').val();
        add_alert_word(word);
    });

    $('#alert_words_list').on('click', '.remove-alert-word', (event) => {
        const word = $(event.currentTarget).parents('li').find('.value').text();
        remove_alert_word(word);
    });

    $('#create_alert_word_form').on('keypress', '#create_alert_word_name', (event) => {
        const key = event.which;
        // Handle enter (13) as "add".
        if (key === 13) {
            event.preventDefault();

            const word = $(event.target).val();
            add_alert_word(word);
        }
    });

    $('#alert-word-settings').on('click', '.close-alert-word-status', (event) => {
        event.preventDefault();
        const alert = $(event.currentTarget).parents('.alert');
        alert.hide();
    });
};

window.alert_words_ui = exports;