<?php
/************************************************************************
 * This file is part of EspoCRM.
 *
 * EspoCRM - Open Source CRM application.
 * Copyright (C) 2014-2023 Yurii Kuznietsov, Taras Machyshyn, Oleksii Avramenko
 * Website: https://www.espocrm.com
 *
 * EspoCRM 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.
 *
 * EspoCRM 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 EspoCRM. If not, see http://www.gnu.org/licenses/.
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU General Public License version 3.
 *
 * In accordance with Section 7(b) of the GNU General Public License version 3,
 * these Appropriate Legal Notices must retain the display of the "EspoCRM" word.
 ************************************************************************/

namespace Espo\EntryPoints;

use Espo\Core\Exceptions\BadRequest;
use Espo\Core\Exceptions\Error;
use Espo\Core\Api\Request;
use Espo\Core\Api\Response;
use Espo\Core\Exceptions\ForbiddenSilent;
use Espo\Core\Exceptions\NotFound;
use Espo\Core\Exceptions\NotFoundSilent;

use Espo\Core\Utils\SystemUser;
use Espo\Entities\User;
use Identicon\Identicon;

class Avatar extends Image
{
    protected string $systemColor = '#a4b5bd';

    /** @var array<int, string|array{int, int, int}> */
    protected $colorList = [
        [111, 168, 214],
        [237, 197, 85],
        [212, 114, 155],
        '#8093BD',
        [124, 196, 164],
        [138, 124, 194],
        [222, 102, 102],
        '#ABE3A1',
        '#E8AF64',
    ];

    /**
     * @return string|array{int, int, int}
     */
    private function getColor(string $hash)
    {
        $length = strlen($hash);

        $sum = 0;

        for ($i = 0; $i < $length; $i++) {
            $sum += ord($hash[$i]);
        }

        $x = $sum % 128 + 1;

        $colorList = $this->metadata->get(['app', 'avatars', 'colorList']) ?? $this->colorList;

        if ($x === 128) {
            $x--;
        }

        $index = intval($x * count($colorList) / 128);

        return $colorList[$index];
    }

    /**
     * @throws BadRequest
     * @throws Error
     * @throws NotFoundSilent
     * @throws ForbiddenSilent
     * @throws NotFound
     */
    public function run(Request $request, Response $response): void
    {
        $userId = $request->getQueryParam('id');
        $size = $request->getQueryParam('size') ?? null;

        if (!$userId) {
            throw new BadRequest();
        }

        /** @var ?User $user */
        $user = $this->entityManager->getEntityById(User::ENTITY_TYPE, $userId);

        if (!$user) {
            $this->renderBlank($response);

            return;
        }

        $id = $user->get('avatarId');

        if ($id) {
            $this->show($response, $id, $size, true);

            return;
        }

        $identicon = new Identicon();

        if (!$size) {
            $size = 'small';
        }

        if (empty($this->getSizes()[$size])) {
            $this->renderBlank($response);

            return;
        }

        $width = $this->getSizes()[$size][0];

        $response
            ->setHeader('Cache-Control', 'max-age=360000, must-revalidate')
            ->setHeader('Content-Type', 'image/png');

        $hash = $userId;

        $color = $this->getColor($userId);

        if ($user->getUserName() === SystemUser::NAME) {
            $color = $this->metadata->get(['app', 'avatars', 'systemColor']) ?? $this->systemColor;
        }

        $imgContent = $identicon->getImageData($hash, $width, $color);

        $response->writeBody($imgContent);
    }

    /**
     * @throws Error
     */
    private function renderBlank(Response $response): void
    {
        ob_start();

        $img  = imagecreatetruecolor(14, 14);

        if ($img === false) {
            throw new Error();
        }

        imagesavealpha($img, true);

        $color = imagecolorallocatealpha($img, 127, 127, 127, 127);

        if ($color === false) {
            throw new Error();
        }

        imagefill($img, 0, 0, $color);
        imagepng($img);
        imagecolordeallocate($img, $color);

        $contents = ob_get_contents();

        if ($contents === false) {
            throw new Error();
        }

        ob_end_clean();

        imagedestroy($img);

        $response
            ->setHeader('Content-Type', 'image/png')
            ->writeBody($contents);
    }
}