<?php
class PixivBridge extends BridgeAbstract {

	// Good resource on API return values (Ex: illustType):
	// https://hackage.haskell.org/package/pixiv-0.1.0/docs/Web-Pixiv-Types.html
	const NAME = 'Pixiv Bridge';
	const URI = 'https://www.pixiv.net/';
	const DESCRIPTION = 'Returns the tag search from pixiv.net';


	const PARAMETERS = array(
		'global' => array(
			'posts' => array(
				'name' => 'Post Limit',
				'type' => 'number',
				'defaultValue' => '10'
			),
			'fullsize' => array(
				'name' => 'Full-size Image',
				'type' => 'checkbox'
			),
			'mode' => array(
				'name' => 'Post Type',
				'type' => 'list',
				'values' => array('All Works' => 'all',
								  'Illustrations' => 'illustrations/',
								  'Manga' => 'manga/',
								  'Novels' => 'novels/')
			),
		),
		'Tag' => array(
			'tag' => array(
				'name' => 'Query to search',
				'exampleValue' => 'オリジナル',
				'required' => true
			)
		),
		'User' => array(
			'userid' => array(
				'name' => 'User ID from profile URL',
				'exampleValue' => '11',
				'required' => true
			)
		)
	);

	// maps from URLs to json keys by context
	const JSON_KEY_MAP = array(
		'Tag' => array(
			'illustrations/' => 'illust',
			'manga/' => 'manga',
			'novels/' => 'novel'
		),
		'User' => array(
			'illustrations/' => 'illusts',
			'manga/' => 'manga',
			'novels/' => 'novels'
		)
	);

	// Hold the username for getName()
	private $username = null;

	public function getName() {
		switch($this->queriedContext) {
			case 'Tag':
				$context = 'Tag';
				$query = $this->getInput('tag');
				break;
			case 'User':
				$context = 'User';
				$query = $this->username ?? $this->getInput('userid');
				break;
			default:
				return parent::getName();
		}
		$mode = array_search($this->getInput('mode'),
							 self::PARAMETERS['global']['mode']['values']);
		return "Pixiv ${mode} from ${context} ${query}";
	}

	public function getURI() {
		switch($this->queriedContext) {
		case 'Tag':
			$uri = static::URI . 'tags/' . urlencode($this->getInput('tag') ?? '');
			break;
		case 'User':
			$uri = static::URI . 'users/' . $this->getInput('userid');
			break;
		default:
			return parent::getURI();
		}
		if ($this->getInput('mode') != 'all') {
			$uri = $uri . '/' . $this->getInput('mode');
		}
		return $uri;
	}

	private function getSearchURI($mode) {
		switch($this->queriedContext) {
		case 'Tag':
			$query = urlencode($this->getInput('tag'));
			$uri = static::URI . 'ajax/search/top/' . $query;
			break;
		case 'User':
			$uri = static::URI . 'ajax/user/' . $this->getInput('userid')
				 . '/profile/top';
			break;
		default:
			returnClientError('Invalid Context');
		}
		return $uri;
	}

	private function getDataFromJSON($json, $json_key) {
		$json = $json['body'][$json_key];
		// Tags context contains subkey
		if ($this->queriedContext == 'Tag') {
			$json = $json['data'];
		}
		return $json;
	}

	private function collectWorksArray() {
		$content = getContents($this->getSearchURI($this->getInput('mode')));
		$content = json_decode($content, true);
		if ($this->getInput('mode') == 'all') {
			$total = array();
			foreach(self::JSON_KEY_MAP[$this->queriedContext] as $mode => $json_key) {
				$current = $this->getDataFromJSON($content, $json_key);
				$total = array_merge($total, $current);
			}
			$content = $total;
		} else {
			$json_key = self::JSON_KEY_MAP[$this->queriedContext][$this->getInput('mode')];
			$content = $this->getDataFromJSON($content, $json_key);
		}
		return $content;
	}

	public function collectData() {
		$content = $this->collectWorksArray();

		$content = array_filter($content, function($v, $k) {
			return !array_key_exists('isAdContainer', $v);
		}, ARRAY_FILTER_USE_BOTH);
		// Sort by updateDate to get newest works
		usort($content, function($a, $b) {
			return $b['updateDate'] <=> $a['updateDate'];
		});
		$content = array_slice($content, 0, $this->getInput('posts'));

		foreach($content as $result) {
			// Store username for getName()
			if (!$this->username)
				$this->username = $result['userName'];

			$item = array();
			$item['uid'] = $result['id'];
			$subpath = array_key_exists('illustType', $result) ? 'artworks/' : 'novel/show.php?id=';
			$item['uri'] = static::URI . $subpath . $result['id'];
			$item['title'] = $result['title'];
			$item['author'] = $result['userName'];
			$item['timestamp'] = $result['updateDate'];
			$item['categories'] = $result['tags'];
			$cached_image = $this->cacheImage($result['url'], $result['id'],
											  array_key_exists('illustType', $result));
			$item['content'] = "<img src='" . $cached_image . "' />";

			// Additional content items
			if (array_key_exists('pageCount', $result)) {
				$item['content'] .= '<br>Page Count: ' . $result['pageCount'];
			} else {
				$item['content'] .= '<br>Word Count: ' . $result['wordCount'];
			}

			$this->items[] = $item;
		}
	}

	private function cacheImage($url, $illustId, $isImage) {
		$illustId = preg_replace('/[^0-9]/', '', $illustId);
		$thumbnailurl = $url;

		$path = PATH_CACHE . 'pixiv_img/';
		if(!is_dir($path))
			mkdir($path, 0755, true);

		$path .= $illustId;
		if ($this->getInput('fullsize')) {
			$path .= '_fullsize';
		}
		$path .= '.jpg';

		if(!is_file($path)) {

			// Get fullsize URL
			if ($isImage && $this->getInput('fullsize')) {
				$ajax_uri = static::URI . 'ajax/illust/' . $illustId;
				$imagejson = json_decode(getContents($ajax_uri), true);
				$url = $imagejson['body']['urls']['original'];
			}

			$headers = array('Referer: ' . static::URI);
			try {
				$illust = getContents($url, $headers);
			} catch (Exception $e) {
				$illust = getContents($thumbnailurl, $headers); // Original thumbnail
			}
			file_put_contents($path, $illust);
		}

		return 'cache/pixiv_img/' . preg_replace('/.*\//', '', $path);
	}
}