<?php
/**
 * webtrees: online genealogy
 * Copyright (C) 2018 webtrees development team
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU 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 General Public License for more details.
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
namespace Fisharebest\Webtrees\Module;

use Fisharebest\Webtrees\Database;
use Fisharebest\Webtrees\I18N;
use Fisharebest\Webtrees\Menu;
use Fisharebest\Webtrees\Tree;
use stdClass;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;

/**
 * Class FrequentlyAskedQuestionsModule
 */
class FrequentlyAskedQuestionsModule extends AbstractModule implements ModuleMenuInterface, ModuleConfigInterface
{
    /** {@inheritdoc} */
    public function getTitle(): string
    {
        /* I18N: Name of a module. Abbreviation for “Frequently Asked Questions” */
        return I18N::translate('FAQ');
    }

    /** {@inheritdoc} */
    public function getDescription(): string
    {
        /* I18N: Description of the “FAQ” module */
        return I18N::translate('A list of frequently asked questions and answers.');
    }

    /**
     * The URL to a page where the user can modify the configuration of this module.
     *
     * @return string
     */
    public function getConfigLink(): string
    {
        return route('module', [
            'module' => $this->getName(),
            'action' => 'Admin',
        ]);
    }

    /**
     * The user can re-order menus. Until they do, they are shown in this order.
     *
     * @return int
     */
    public function defaultMenuOrder(): int
    {
        return 40;
    }

    /**
     * A menu, to be added to the main application menu.
     *
     * @param Tree $tree
     *
     * @return Menu|null
     */
    public function getMenu(Tree $tree)
    {
        $faqs = Database::prepare(
            "SELECT block_id FROM `##block`" .
            " JOIN `##block_setting` USING (block_id)" .
            " WHERE module_name = :module_name AND IFNULL(gedcom_id, :tree_id_1) = :tree_id_2" .
            " AND setting_name='languages' AND (setting_value LIKE CONCAT('%', :locale, '%') OR setting_value='')"
        )->execute([
            'module_name' => $this->getName(),
            'tree_id_1'   => $tree->getTreeId(),
            'tree_id_2'   => $tree->getTreeId(),
            'locale'      => WT_LOCALE,
        ])->fetchAll();

        if ($faqs) {
            return new Menu($this->getTitle(), route('module', [
                'module' => 'faq',
                'action' => 'Show',
                'ged'    => $tree->getName(),
            ]), 'menu-help');
        }

        return null;
    }

    /**
     * @param Tree $tree
     *
     * @return Response
     */
    public function getAdminAction(Tree $tree): Response
    {
        $this->layout = 'layouts/administration';

        $faqs = Database::prepare(
            "SELECT block_id, block_order, gedcom_id, bs1.setting_value AS header, bs2.setting_value AS faqbody" .
            " FROM `##block` b" .
            " JOIN `##block_setting` bs1 USING (block_id)" .
            " JOIN `##block_setting` bs2 USING (block_id)" .
            " WHERE module_name = :module_name" .
            " AND bs1.setting_name = 'header'" .
            " AND bs2.setting_name = 'faqbody'" .
            " AND IFNULL(gedcom_id, :tree_id_1) = :tree_id_2" .
            " ORDER BY block_order"
        )->execute([
            'module_name' => $this->getName(),
            'tree_id_1'   => $tree->getTreeId(),
            'tree_id_2'   => $tree->getTreeId(),
        ])->fetchAll();

        $min_block_order = Database::prepare(
            "SELECT MIN(block_order) FROM `##block` WHERE module_name = 'faq' AND (gedcom_id = :tree_id OR gedcom_id IS NULL)"
        )->execute([
            'tree_id' => $tree->getTreeId(),
        ])->fetchOne();

        $max_block_order = Database::prepare(
            "SELECT MAX(block_order) FROM `##block` WHERE module_name = 'faq' AND (gedcom_id = :tree_id OR gedcom_id IS NULL)"
        )->execute([
            'tree_id' => $tree->getTreeId(),
        ])->fetchOne();

        $title = I18N::translate('Frequently asked questions') . ' — ' . $tree->getTitle();

        return $this->viewResponse('modules/faq/config', [
            'faqs'            => $faqs,
            'max_block_order' => $max_block_order,
            'min_block_order' => $min_block_order,
            'title'           => $title,
            'tree'            => $tree,
            'tree_names'      => Tree::getNameList(),
        ]);
    }

    /**
     * @param Request $request
     * @param Tree    $tree
     *
     * @return RedirectResponse
     */
    public function postAdminDeleteAction(Request $request, Tree $tree): RedirectResponse
    {
        $block_id = (int)$request->get('block_id');

        Database::prepare(
            "DELETE FROM `##block_setting` WHERE block_id = :block_id"
        )->execute(['block_id' => $block_id]);

        Database::prepare(
            "DELETE FROM `##block` WHERE block_id = :block_id"
        )->execute(['block_id' => $block_id]);


        $url = route('module', [
            'module' => 'faq',
            'action' => 'Admin',
            'ged'    => $tree->getName(),
        ]);

        return new RedirectResponse($url);
    }

    /**
     * @param Request $request
     * @param Tree    $tree
     *
     * @return RedirectResponse
     */
    public function postAdminMoveDownAction(Request $request, Tree $tree): RedirectResponse
    {
        $block_id = (int)$request->get('block_id');

        $block_order = Database::prepare(
            "SELECT block_order FROM `##block` WHERE block_id = :block_id"
        )->execute([
            'block_id' => $block_id,
        ])->fetchOne();

        $swap_block = Database::prepare(
            "SELECT block_order, block_id" .
            " FROM `##block`" .
            " WHERE block_order=(" .
            "  SELECT MIN(block_order) FROM `##block` WHERE block_order > :block_order AND module_name = :module_name_1" .
            " ) AND module_name = :module_name_2" .
            " LIMIT 1"
        )->execute([
            'block_order'   => $block_order,
            'module_name_1' => $this->getName(),
            'module_name_2' => $this->getName(),
        ])->fetchOneRow();

        if ($swap_block !== null) {
            Database::prepare(
                "UPDATE `##block` SET block_order = :block_order WHERE block_id = :block_id"
            )->execute([
                'block_order' => $swap_block->block_order,
                'block_id'    => $block_id,
            ]);
            Database::prepare(
                "UPDATE `##block` SET block_order = :block_order WHERE block_id = :block_id"
            )->execute([
                'block_order' => $block_order,
                'block_id'    => $swap_block->block_id,
            ]);
        }

        $url = route('module', [
            'module' => 'faq',
            'action' => 'Admin',
            'ged'    => $tree->getName(),
        ]);

        return new RedirectResponse($url);
    }

    /**
     * @param Request $request
     * @param Tree    $tree
     *
     * @return RedirectResponse
     */
    public function postAdminMoveUpAction(Request $request, Tree $tree): RedirectResponse
    {
        $block_id = (int)$request->get('block_id');

        $block_order = Database::prepare(
            "SELECT block_order FROM `##block` WHERE block_id = :block_id"
        )->execute([
            'block_id' => $block_id,
        ])->fetchOne();

        $swap_block = Database::prepare(
            "SELECT block_order, block_id" .
            " FROM `##block`" .
            " WHERE block_order = (" .
            "  SELECT MAX(block_order) FROM `##block` WHERE block_order < :block_order AND module_name = :module_name_1" .
            " ) AND module_name = :module_name_2" .
            " LIMIT 1"
        )->execute([
            'block_order'   => $block_order,
            'module_name_1' => $this->getName(),
            'module_name_2' => $this->getName(),
        ])->fetchOneRow();

        if ($swap_block !== null) {
            Database::prepare(
                "UPDATE `##block` SET block_order = :block_order WHERE block_id = :block_id"
            )->execute([
                'block_order' => $swap_block->block_order,
                'block_id'    => $block_id,
            ]);
            Database::prepare(
                "UPDATE `##block` SET block_order = :block_order WHERE block_id = :block_id"
            )->execute([
                'block_order' => $block_order,
                'block_id'    => $swap_block->block_id,
            ]);
        }

        $url = route('module', [
            'module' => 'faq',
            'action' => 'Admin',
            'ged'    => $tree->getName(),
        ]);

        return new RedirectResponse($url);
    }

    /**
     * @param Request $request
     * @param Tree    $tree
     *
     * @return Response
     */
    public function getAdminEditAction(Request $request, Tree $tree): Response
    {
        $this->layout = 'layouts/administration';

        $block_id = (int)$request->get('block_id');

        if ($block_id === 0) {
            // Creating a new faq
            $header      = '';
            $faqbody     = '';
            $block_order = Database::prepare(
                "SELECT IFNULL(MAX(block_order)+1, 0) FROM `##block` WHERE module_name = :module_name"
            )->execute([
                'module_name' => $this->getName(),
            ])->fetchOne();
            $languages   = [];

            $title = I18N::translate('Add an FAQ');
        } else {
            // Editing an existing faq
            $header      = $this->getBlockSetting($block_id, 'header');
            $faqbody     = $this->getBlockSetting($block_id, 'faqbody');
            $block_order = Database::prepare(
                "SELECT block_order FROM `##block` WHERE block_id = :block_id"
            )->execute(['block_id' => $block_id])->fetchOne();
            $languages   = explode(',', $this->getBlockSetting($block_id, 'languages'));

            $title = I18N::translate('Edit the FAQ');
        }

        // @TODO enable CKEDITOR

        return $this->viewResponse('modules/faq/edit', [
            'block_id'    => $block_id,
            'block_order' => $block_order,
            'header'      => $header,
            'faqbody'     => $faqbody,
            'languages'   => $languages,
            'title'       => $title,
            'tree'        => $tree,
            'tree_names'  => Tree::getNameList(),
        ]);
    }

    /**
     * @param Request $request
     * @param Tree    $tree
     *
     * @return RedirectResponse
     */
    public function postAdminEditAction(Request $request, Tree $tree): RedirectResponse
    {
        $block_id  = (int)$request->get('block_id');
        $faqbody   = $request->get('faqbody', '');
        $header    = $request->get('header', '');
        $languages = $request->get('languages', []);

        if ($block_id !== 0) {
            Database::prepare(
                "UPDATE `##block` SET gedcom_id = NULLIF(:tree_id, '0'), block_order = :block_order WHERE block_id = :block_id"
            )->execute([
                'tree_id'     => (int) $request->get('gedcom_id'),
                'block_order' => (int) $request->get('block_order'),
                'block_id'    => $block_id,
            ]);
        } else {
            Database::prepare(
                "INSERT INTO `##block` (gedcom_id, module_name, block_order) VALUES (NULLIF(:tree_id, '0'), :module_name, :block_order)"
            )->execute([
                'tree_id'     => (int) $request->get('gedcom_id'),
                'module_name' => $this->getName(),
                'block_order' => (int) $request->get('block_order'),
            ]);

            $block_id = Database::getInstance()->lastInsertId();
        }

        $this->setBlockSetting($block_id, 'faqbody', $faqbody);
        $this->setBlockSetting($block_id, 'header', $header);
        $this->setBlockSetting($block_id, 'languages', implode(',', $languages));

        $url = route('module', [
            'module' => 'faq',
            'action' => 'Admin',
            'ged'    => $tree->getName(),
        ]);

        return new RedirectResponse($url);
    }

    /**
     * @param Request $request
     * @param Tree    $tree
     *
     * @return Response
     */
    public function getShowAction(Request $request, Tree $tree): Response
    {
        $faqs = Database::prepare(
            "SELECT block_id, bs1.setting_value AS header, bs2.setting_value AS body, bs3.setting_value AS languages" .
            " FROM `##block` b" .
            " JOIN `##block_setting` bs1 USING (block_id)" .
            " JOIN `##block_setting` bs2 USING (block_id)" .
            " JOIN `##block_setting` bs3 USING (block_id)" .
            " WHERE module_name = :module_name" .
            " AND bs1.setting_name = 'header'" .
            " AND bs2.setting_name = 'faqbody'" .
            " AND bs3.setting_name = 'languages'" .
            " AND IFNULL(gedcom_id, :tree_id_1) = :tree_id_2" .
            " ORDER BY block_order"
        )->execute([
            'module_name' => $this->getName(),
            'tree_id_1'   => $tree->getTreeId(),
            'tree_id_2'   => $tree->getTreeId(),
        ])->fetchAll();

        // Filter foreign languages.
        $faqs = array_filter($faqs, function (stdClass $faq): bool {
            return $faq->languages === '' || in_array(WT_LOCALE, explode(',', $faq->languages));
        });

        return $this->viewResponse('modules/faq/show', [
            'faqs'  => $faqs,
            'title' => I18N::translate('Frequently asked questions'),
            'tree'  => $tree,
        ]);
    }
}