class ViewsSlideshowCycleCommands

class ViewsSlideshowCycleCommands extends DrushCommands {
    
    /**
     * Download and install the jQuery Cycle library.
     *
     * @command views:slideshow:cycle
     * @aliases dl-cycle,views-slideshow-cycle-cycle
     */
    public function downloadCycle() {
        $this->installLibrary('jQuery Cycle', 'libraries/jquery.cycle', 'jquery.cycle.all.js', 'https://raw.githubusercontent.com/malsup/cycle/3.0.3/jquery.cycle.all.js');
    }
    
    /**
     * Download and install the JSON2 library.
     *
     * @command views:slideshow:json2
     * @aliases dl-json2,views-slideshow-cycle-json2
     */
    public function downloadJson2() {
        $this->installLibrary('JSON2', 'libraries/json2', 'json2.js', 'https://raw.githubusercontent.com/douglascrockford/JSON-js/master/json2.js');
    }
    
    /**
     * Download and install the jquery.hoverIntent library.
     *
     * @command views:slideshow:hoverintent
     * @aliases dl-hoverintent,views-slideshow-cycle-hoverintent
     */
    public function downloadHoverIntent() {
        $this->installLibrary('jQuery HoverIntent', 'libraries/jquery.hover-intent', 'jquery.hoverIntent.js', 'https://raw.githubusercontent.com/briancherne/jquery-hoverIntent/master/jquery.hoverIntent.js');
    }
    
    /**
     * Download and install the jQuery.pause library.
     *
     * @command views:slideshow:pause
     * @aliases dl-pause,views-slideshow-cycle-pause
     */
    public function downloadPause() {
        $this->installLibrary('jQuery Pause', 'libraries/jquery.pause', 'jquery.pause.js', 'https://raw.githubusercontent.com/tobia/Pause/master/jquery.pause.js');
    }
    
    /**
     * Download and install the jQuery Cycle.
     *
     * Download and install JQuery hoverIntent, JSON2 and Pause libraries.
     *
     * @command views:slideshow:lib
     * @aliases dl-cycle-lib,views-slideshow-cycle-lib
     */
    public function downloadLib() {
        $this->downloadCycle();
        $this->downloadHoverIntent();
        $this->downloadJson2();
        $this->downloadPause();
    }
    
    /**
     * Helper function to download a library in the given directory.
     *
     * @param string $name
     *   The user friendly name of the download.
     * @param string $path
     *   The directory to download to.
     * @param string $filename
     *   The filename to expect.
     * @param string $url
     *   The url to download the file from.
     */
    protected function installLibrary(string $name, string $path, string $filename, string $url) : void {
        // Create the path if it does not exist.
        if (!is_dir($path)) {
            drush_op('mkdir', $path, 0755, TRUE);
            $this->logger()
                ->info(dt('Directory @path was created', [
                '@path' => $path,
            ]));
        }
        // Be sure we can write in the directory.
        $perms = substr(sprintf('%o', fileperms($path)), -4);
        if ($perms !== '0755') {
            $this->processManager()
                ->process([
                'chmod',
                755,
                $path,
            ])
                ->start();
        }
        else {
            $perms = NULL;
        }
        $dir = getcwd();
        // Download the JavaScript file.
        if (is_file($path . '/' . $filename)) {
            $this->logger()
                ->notice(dt('@name appears to be already installed.', [
                '@name' => $name,
            ]));
        }
        $download = $this->processManager()
            ->process([
            'wget',
            $url,
        ], $path);
        $download->start();
        if ($download->wait() === 0) {
            $this->logger()
                ->success(dt('The latest version of @name has been downloaded to @path', [
                '@name' => $name,
                '@path' => $path,
            ]));
        }
        else {
            $this->logger()
                ->warning(dt('Drush was unable to download the @name library to @path, error: @error', [
                '@name' => $name,
                '@path' => $path,
                '@error' => $download->getErrorOutput(),
            ]));
        }
        chdir($dir);
        // Restore the previous permissions.
        if ($perms) {
            $this->processManager()
                ->process([
                'chmod',
                $perms,
                $path,
            ])
                ->start();
        }
    }

}