class SettingsPage
{
    const OPTION_KEY = 'wcexics_options';
    const ENABLE_ITEMCSV_OPT = 'enable_itemcsv';

    /**
     * Creates settings page
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return void
     */
    public static function init() {
        add_action('admin_init', [get_class(), 'registerSetting']);
        add_action('usces_action_shop_admin_menue', [get_class(), 'registerSettingsPage'], 20);
    }

    /**
     * Returns options array
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return array
     */
    public static function getOptions() {
        return get_option(self::OPTION_KEY, [
            self::ENABLE_ITEMCSV_OPT => 'no',
        ]);
    }

    /**
     * Registers `wcexics_options` option names
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return void
     */
    public static function registerSetting() {
        register_setting(self::OPTION_KEY, self::ENABLE_ITEMCSV_OPT);
    }

    /**
     * Registers settings page
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return void
     */
    public static function registerSettingsPage() {
        add_submenu_page(
            USCES_PLUGIN_BASENAME,
            __('WCEX Item Combo-Set', 'wcexics'),
            __('COMBO-SET', 'wcexics'),
            'manage_options',
            'wcexics_settings_page',
            [get_class(), 'addSettingsPage']
        );
    }

    /**
     * Outputs settings page HTML
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return void
     */
    public static function addSettingsPage() {
        if (!current_user_can('manage_options')) {
            wp_die(__('You do not have sufficient permissions to access this page.'));
        }

        if (isset($_POST['wcexics_update_options']) && (int)wp_unslash(sanitize_text_field($_POST['wcexics_update_options'])) === 1) {
            $opts = self::getOptions();
            if (isset($_POST[self::ENABLE_ITEMCSV_OPT])) {
                $optv = trim(wp_unslash(sanitize_text_field($_POST[self::ENABLE_ITEMCSV_OPT])));
                if ($optv === 'yes' || $optv === 'no') {
                    $opts[self::ENABLE_ITEMCSV_OPT] = $optv;
                }
            }

            update_option(self::OPTION_KEY, $opts);
        }

        ?>
        <div class="wrap">
            <h1><?php esc_html_e('WCEX Item Combo-Set', 'wcexics'); ?></h1>
            <form method="post" action="">
                <?php settings_fields(self::OPTION_KEY); ?>
                <table class="form-table" role="presentation">
                    <?php self::enableItemCSVSection(); ?>
                </table>
                <input type="hidden" name="wcexics_update_options" value="1" />
                <?php submit_button(); ?>
            </form>
        </div>
        <?php
    }

    /**
     * Adds radio buttons for enabling/disabling item CSV
     *
     * @author Evan D Shaw <evandanielshaw@gmail.com>
     * @return void
     */
    public static function enableItemCSVSection() {
        $opts = self::getOptions();
        ?>
        <tr>
            <th scope="row"><?php esc_html_e('Item CSV export/import', 'wcexics'); ?></th>
            <td>
                <fieldset>
                    <label>
                        <input
                            name="<?php echo self::ENABLE_ITEMCSV_OPT; ?>"
                            type="radio"
                            value="yes"
                            <?php echo $opts[self::ENABLE_ITEMCSV_OPT] === 'yes' ? 'checked' : ''; ?>
                        />
                        <?php esc_html_e('Enabled') ?>
                    </label>
                    <br />
                    <label>
                        <input
                            name="<?php echo self::ENABLE_ITEMCSV_OPT; ?>"
                            type="radio"
                            value="no"
                            <?php echo $opts[self::ENABLE_ITEMCSV_OPT] === 'no' ? 'checked' : ''; ?>
                        />
                        <?php esc_html_e('Disabled') ?>
                    </label>
                </fieldset>
                <p class="description">
                    <?php _e('If enabled, importing requires certain columns to be present in the CSV file.', 'wcexics'); ?>
                </p>
            </td>
        </tr>
        <?php
    }
}