<?php

class AppleAppStoreBridge extends BridgeAbstract {

	const MAINTAINER = 'captn3m0';
	const NAME = 'Apple App Store';
	const URI = 'https://apps.apple.com/';
	const CACHE_TIMEOUT = 3600; // 1h
	const DESCRIPTION = 'Returns version updates for a specific application';

	const PARAMETERS = array(array(
		'id' => array(
			'name'	=> 'Application ID',
			'required'	=> true,
			'exampleValue'	=> '310633997'
		),
		'p' => array(
			'name'	=> 'Platform',
			'type'	=> 'list',
			'values'	=> array(
				'iPad'	=> 'ipad',
				'iPhone'	=> 'iphone',
				'Mac'	=> 'mac',

				// The following 2 are present in responses
				// but not yet tested
				'Web'	=> 'web',
				'Apple TV'	=> 'appletv',
			),
			'defaultValue'	=> 'iphone',
		),
		'country'	=> array(
			'name'	=> 'Store Country',
			'type'	=> 'list',
			'values'	=> array(
				'US'	=> 'US',
				'India'	=> 'IN',
				'Canada' => 'CA',
				'Germany' => 'DE',
			),
			'defaultValue'	=> 'US',
		),
	));

	const PLATFORM_MAPPING = array(
		'iphone'	=> 'ios',
		'ipad'	=> 'ios',
	);

	private function makeHtmlUrl($id, $country){
		return 'https://apps.apple.com/' . $country . '/app/id' . $id;
	}

	private function makeJsonUrl($id, $platform, $country){
		return "https://amp-api.apps.apple.com/v1/catalog/$country/apps/$id?platform=$platform&extend=versionHistory";
	}

	public function getName(){
		if (isset($this->name)) {
			return $this->name . ' - AppStore Updates';
		}

		return parent::getName();
	}

	/**
	 * In case of some platforms, the data is present in the initial response
	 */
	private function getDataFromShoebox($id, $platform, $country){
		$uri = $this->makeHtmlUrl($id, $country);
		$html = getSimpleHTMLDOMCached($uri, 3600);
		$script = $html->find('script[id="shoebox-ember-data-store"]', 0);

		$json = json_decode($script->innertext, true);
		return $json['data'];
	}

	private function getJWTToken($id, $platform, $country){
		$uri = $this->makeHtmlUrl($id, $country);

		$html = getSimpleHTMLDOMCached($uri, 3600);

		$meta = $html->find('meta[name="web-experience-app/config/environment"]', 0);

		$json = urldecode($meta->content);

		$json = json_decode($json);

		return $json->MEDIA_API->token;
	}

	private function getAppData($id, $platform, $country, $token){
		$uri = $this->makeJsonUrl($id, $platform, $country);

		$headers = array(
			"Authorization: Bearer $token",
			'Origin: https://apps.apple.com',
		);

		$json = json_decode(getContents($uri, $headers), true);

		return $json['data'][0];
	}

	/**
	 * Parses the version history from the data received
	 * @return array list of versions with details on each element
	 */
	private function getVersionHistory($data, $platform){
		switch($platform) {
			case 'mac':
				return $data['relationships']['platforms']['data'][0]['attributes']['versionHistory'];
			default:
				$os = self::PLATFORM_MAPPING[$platform];
				return $data['attributes']['platformAttributes'][$os]['versionHistory'];
		}
	}

	public function collectData() {
		$id = $this->getInput('id');
		$country = $this->getInput('country');
		$platform = $this->getInput('p');

		switch ($platform) {
			case 'mac':
				$data = $this->getDataFromShoebox($id, $platform, $country);
				break;

			default:
				$token = $this->getJWTToken($id, $platform, $country);
				$data = $this->getAppData($id, $platform, $country, $token);
		}

		$versionHistory = $this->getVersionHistory($data, $platform);
		$name = $this->name = $data['attributes']['name'];
		$author = $data['attributes']['artistName'];

		foreach ($versionHistory as $row) {
			$item = array();

			$item['content'] = nl2br($row['releaseNotes']);
			$item['title'] = $name . ' - ' . $row['versionDisplay'];
			$item['timestamp'] = $row['releaseDate'];
			$item['author'] = $author;

			$item['uri'] = $this->makeHtmlUrl($id, $country);

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