<?php
/**
 * ChooseTheme - GNU social plugin enabling user to select preferred theme
 * Copyright (C) 2015, kollektivet0x242.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 * @author   Knut Erik Hollund <knut.erik@unlike.no>
 * @copyright 2015 kollektivet0x242. http://www.kollektivet0x242.no
 *
 * @license  GNU Affero General Public License http://www.gnu.org/licenses/
 */

defined('GNUSOCIAL') || die();

class ChooseThemeSettingsAction extends SettingsAction
{
    /**
     * Title of the page
     * @return string Page title
     * @throws Exception
     */
    public function title(): string
    {
        // TRANS: Page title.
        return _m('Choose theme settings');
    }

    /**
     * Instructions for use
     * @return string Instructions for use
     * @throws Exception
     */
    public function getInstructions(): string
    {
        // TRANS: Page instructions.
        return _m('Choose theme');
    }

    /**
     * Show the form for ChooseTheme
     * @return void
     */
    public function showContent(): void
    {
        $site_theme = common_config('site', 'theme');
        $prefs = $this->scoped->getPref('chosen_theme', 'theme', $site_theme);
        if ($prefs === null) {
            common_debug('No chosen theme found in database for user.');
        }

        //Get a list of available themes on instance
        $available_themes = Theme::listAvailable();
        $chosenone = array_search($prefs, $available_themes, true);
        $form = new ChooseThemeForm($this, $chosenone);
        $form->show();
    }


    /**
     * Handler method
     *
     * @return string
     * @throws Exception
     */
    public function doPost(): string
    {
        //Get a list of available themes on instance
        $available_themes = Theme::listAvailable();
        $chosen_theme = $available_themes[(int)$this->arg('dwct', '0')];

        $this->msg = 'Settings saved.';

        $success = $this->scoped->setPref('chosen_theme', 'theme', $chosen_theme);
        // TRANS: Confirmation shown when user profile settings are saved.
        if (!$success) {
            $this->msg = 'No valid theme chosen.';
        }

        return _m($this->msg);
    }
}


class ChooseThemeForm extends Form
{
    protected $prefs = null;


    public function __construct($out, $prefs)
    {
        parent::__construct($out);

        if ($prefs != null) {
            $this->prefs = $prefs;
        } else {
            $this->prefs = common_config('site', 'theme');
        }
    }

    /**
     * Visible or invisible data elements
     *
     * Display the form fields that make up the data of the form.
     * Sub-classes should overload this to show their data.
     * @return void
     * @throws Exception
     */

    public function formData(): void
    {

        //Get a list of available themes on instance
        $available_themes = Theme::listAvailable();

        //Remove theme 'licenses' from selectable themes.
        //The 'licenses' theme is not an actual theme and
        //will just mess-up the gui.
        $key = array_search('licenses', $available_themes);
        if ($key != false) {
            unset($available_themes[$key]);
        }

        $this->elementStart('fieldset');
        $this->elementStart('ul', 'form_data');
        $this->elementStart('li');
        $this->dropdown('dwct', _m('Themes'), $available_themes, _m('Select a theme'), false, $this->prefs);
        $this->elementEnd('li');
        $this->elementEnd('ul');
        $this->elementEnd('fieldset');
    }

    /**
     * Buttons for form actions
     *
     * Submit and cancel buttons (or whatever)
     * Sub-classes should overload this to show their own buttons.
     * @return void
     */

    public function formActions(): void
    {
        $this->submit('submit', _('Save'));
    }

    /**
     * ID of the form
     *
     * Should be unique on the page. Sub-classes should overload this
     * to show their own IDs.
     * @return string ID of the form
     */

    public function id(): string
    {
        return 'form_choosetheme_prefs';
    }

    /**
     * Action of the form.
     *
     * URL to post to. Should be overloaded by subclasses to give
     * somewhere to post to.
     * @return string URL to post to
     */

    public function action(): string
    {
        return common_local_url('choosethemesettings');
    }

    /**
     * Class of the form. May include space-separated list of multiple classes.
     *
     * @return string the form's class
     */

    public function formClass(): string
    {
        return 'form_settings';
    }
}