<?php
/**
 * Insipid
 * Personal web-bookmark-system
 *
 * Copyright 2016-2023 Johannes Keßler
 *
 * Development starting from 2011: Johannes Keßler
 * https://www.bananas-playground.net/projekt/insipid/
 *
 * creator:
 * Luke Reeves <luke@neuro-tech.net>
 *
 * 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/gpl-3.0.
 *
 */

/**
 * class Snapshot
 * create from given ULR a Screenshot for storage
 * right now it uses google pagespeedonline.
 */
class Snapshot {
    /**
     * @var string
     */
    private string $_googlePageSpeed = 'https://www.googleapis.com/pagespeedonline/v5/runPagespeed?url=';

    /**
     * @var string
     */
    private string $_wkhtmltoimageOptions = '--load-error-handling ignore --quality 80 --quiet --width 1900';

    /**
     * Snapshot constructor
     */
    public function __constructor(): void {}

    /**
     * call given url with google PageSpeed API
     * to receive image data
     *
     * @param String $url URL to take a thumbnail from
     * @param string $filename
     * @return boolean
     */
    public function doSnapshot(string $url, string $filename): bool {
        $ret = false;

        if(!empty($url) && is_writable(dirname($filename))) {
            if(DEBUG) {
                Summoner::sysLog("[DEBUG] try to save to $filename with $this->_googlePageSpeed for $url");
            }
            $theCall = Summoner::curlCall($this->_googlePageSpeed.urlencode($url).'&screenshot=true');
            if(!empty($theCall)) {
                $jsonData = json_decode($theCall,true);
                if(DEBUG) {
                    Summoner::sysLog("[DEBUG] Call result data: ".var_export($jsonData, true));
                }
                if(!empty($jsonData) && isset($jsonData['lighthouseResult']['audits']['full-page-screenshot']['details']['screenshot']['data'])) {
                    $imageData = $jsonData['lighthouseResult']['audits']['full-page-screenshot']['details']['screenshot']['data'];

                    $source = fopen($imageData, 'r');
                    $destination = fopen($filename, 'w');
                    if(stream_copy_to_stream($source, $destination)) {
                        $ret = $filename;
                    }
                    fclose($source);
                    fclose($destination);
                } elseif(DEBUG) {
                    Summoner::sysLog("[DEBUG] invalid json data. Path ['lighthouseResult']['audits']['full-page-screenshot']['details']['screenshot']['data'] not found in : ".var_export($jsonData, true));
                }
            } elseif(DEBUG) {
                Summoner::sysLog("[DEBUG] curl call failed");
            }
        }

        return $ret;
    }

    /**
     * use configured COMPLETE_PAGE_SCREENSHOT_COMMAND to create a whole page screenshot
     * of the given link and store it locally
     *
     * @TODO: TBD
     *
     * @param String $url URL to take the screenshot from
     * @param string $filename
     * @return boolean
     */
    public function wholePageSnapshot(string $url, string $filename): bool {
        $ret = false;

        require_once 'lib/shellcommand.class.php';

        if(!empty($url) && is_writable(dirname($filename))) {
            $cmd = COMPLETE_PAGE_SCREENSHOT_COMMAND;
            $params = $this->_wkhtmltoimageOptions." ".$url." ".$filename;
            $command = new ShellCommand($cmd." ".$params);
            if ($command->execute()) {
                $ret = $command->getOutput();
            } else {
                Summoner::sysLog($command->getError());
                $ret = $command->getExitCode();
            }
        }

        return $ret;
    }
}