<?php
/**
 * webtrees: online genealogy
 * Copyright (C) 2019 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/>.
 */
declare(strict_types=1);

namespace Fisharebest\Webtrees\Statistics\Google;

use function count;
use Fisharebest\Webtrees\Family;
use Fisharebest\Webtrees\I18N;
use Fisharebest\Webtrees\Module\ModuleThemeInterface;
use Fisharebest\Webtrees\Statistics\Service\ColorService;
use Fisharebest\Webtrees\Tree;
use Illuminate\Database\Capsule\Manager as DB;
use stdClass;

/**
 * A chart showing the largest families (Families with most children).
 */
class ChartFamilyLargest
{
    /**
     * @var Tree
     */
    private $tree;

    /**
     * @var ModuleThemeInterface
     */
    private $theme;

    /**
     * @var ColorService
     */
    private $color_service;

    /**
     * Constructor.
     *
     * @param Tree $tree
     */
    public function __construct(Tree $tree)
    {
        $this->tree          = $tree;
        $this->theme         = app(ModuleThemeInterface::class);
        $this->color_service = new ColorService();
    }

    /**
     * Returns the related database records.
     *
     * @param int $total
     *
     * @return stdClass[]
     */
    private function queryRecords(int $total): array
    {
        $query = DB::table('families')
            ->select(['f_numchil AS total', 'f_id AS id'])
            ->where('f_file', '=', $this->tree->id())
            ->orderBy('total', 'desc')
            ->limit($total);

        return $query->get()->all();
    }

    /**
     * Create a chart of the largest families.
     *
     * @param string|null $color_from
     * @param string|null $color_to
     * @param int         $total
     *
     * @return string
     */
    public function chartLargestFamilies(
        string $color_from = null,
        string $color_to = null,
        int    $total = 10
    ): string {
        $chart_color1 = (string) $this->theme->parameter('distribution-chart-no-values');
        $chart_color2 = (string) $this->theme->parameter('distribution-chart-high-values');
        $color_from   = $color_from ?? $chart_color1;
        $color_to     = $color_to   ?? $chart_color2;

        $data = [
            [
                I18N::translate('Type'),
                I18N::translate('Total')
            ],
        ];

        foreach ($this->queryRecords($total) as $record) {
            $family = Family::getInstance($record->id, $this->tree);

            if ($family && $family->canShow()) {
                $data[] = [
                    htmlspecialchars_decode(strip_tags($family->fullName())),
                    $record->total
                ];
            }
        }

        $colors = $this->color_service->interpolateRgb($color_from, $color_to, count($data) - 1);

        return view(
            'statistics/other/charts/pie',
            [
                'title'       => I18N::translate('Largest families'),
                'data'        => $data,
                'colors'      => $colors,
            ]
        );
    }
}