<?php

/* This is a mashup of FlickrExploreBridge by sebsauvage and FlickrTagBridge
 * by erwang, providing the functionality of both in one.
 */
class FlickrBridge extends BridgeAbstract {

    const MAINTAINER = "logmanoriginal";
    const NAME = "Flickr Bridge";
    const URI = "https://www.flickr.com/";
    const CACHE_TIMEOUT = 21600; // 6 hours
    const DESCRIPTION = "Returns images from Flickr";

    const PARAMETERS = array(
        'Explore' => array(),
        'By keyword' => array(
            'q' => array(
                'name' => 'Keyword',
                'type' => 'text',
                'required' => true,
                'title' => 'Insert keyword',
                'exampleValue' => 'bird'
            )
        ),
        'By username' => array(
            'u' => array(
                'name' => 'Username',
                'type' => 'text',
                'required' => true,
                'title' => 'Insert username (as shown in the address bar)',
                'exampleValue' => 'flickr'
            )
        ),
    );

    public function collectData(){
        switch($this->queriedContext){
        case 'Explore':
            $key = 'photos';
            $html = getSimpleHTMLDOM(self::URI . 'explore')
                or returnServerError('Could not request Flickr.');
            break;
        case 'By keyword':
            $key = 'photos';
            $html = getSimpleHTMLDOM(self::URI . 'search/?q=' . urlencode($this->getInput('q')) . '&s=rec')
                or returnServerError('No results for this query.');
            break;
        case 'By username':
            $key = 'photoPageList';
            $html = getSimpleHTMLDOM(self::URI . 'photos/' . urlencode($this->getInput('u')))
                or returnServerError('Requested username can\'t be found.');
            break;
        default:
            returnClientError('Invalid context: ' . $this->queriedContext);
        }

        // Find SCRIPT containing JSON data
        $model = $html->find('.modelExport', 0);
        $model_text = $model->innertext;

        // Find start and end of JSON data
        $start = strpos($model_text, 'modelExport:') + strlen('modelExport:');
        $end = strpos($model_text, 'auth:') - strlen('auth:');

        // Dissect JSON data and remove trailing comma
        $model_text = trim(substr($model_text, $start, $end - $start));
        $model_text = substr($model_text, 0, strlen($model_text) - 1);

        $model_json = json_decode($model_text, true);

        foreach($html->find('.photo-list-photo-view') as $element){
            // Get the styles
            $style = explode(';', $element->style);

            // Get the background-image style
            $backgroundImage = explode(':', end($style));

            // URI type : url(//cX.staticflickr.com/X/XXXXX/XXXXXXXXX.jpg)
            $imageURI = trim(str_replace(['url(', ')'], '', end($backgroundImage)));

            // Get the image ID
            $imageURIs = explode('_', basename($imageURI));
            $imageID = reset($imageURIs);

            // Use JSON data to build items
            foreach(reset($model_json)[0][$key]['_data'] as $element){
                if($element['id'] === $imageID){
                    $item = array();

                    /* Author name depends on scope. On a keyword search the
                     * author is part of the picture data. On a username search
                     * the author is part of the owner data.
                     */
                    if(array_key_exists('username', $element)){
                        $item['author'] = $element['username'];
                    } elseif (array_key_exists('owner', reset($model_json)[0])){
                        $item['author'] = reset($model_json)[0]['owner']['username'];
                    }

                    $item['title'] = (array_key_exists('title', $element) ? $element['title'] : 'Untitled');
                    $item['uri'] = self::URI . 'photo.gne?id=' . $imageID;

                    $description = (array_key_exists('description', $element) ? $element['description'] : '');

                    $item['content'] = '<a href="'
                    . $item['uri']
                    . '"><img src="'
                    . $imageURI . '" /></a>'
                    . '<br>'
                    . '<p>'
                    . $description
                    . '</p>';

                    $this->items[] = $item;

                    break;
                }
            }
        }
    }
}