<?php
class NationalGeographicBridge extends BridgeAbstract {

	const CONTEXT_BY_TOPIC = 'By Topic';
	const PARAMETER_TOPIC = 'topic';
	const PARAMETER_FULL_ARTICLE = 'full';
	const TOPIC_MAGAZINE = 'Magazine';
	const TOPIC_LATEST_STORIES = 'Latest Stories';
	const CACHE_TIMEOUT = 900; //15 min

	const NAME = 'National Geographic';
	const URI = 'https://www.nationalgeographic.com/';
	const DESCRIPTION = 'Fetches the latest articles from the National Geographic Magazine';
	const MAINTAINER = 'csisoap';
	const PARAMETERS = array(
		self::CONTEXT_BY_TOPIC => array(
			self::PARAMETER_TOPIC => array(
				'name' => 'Topic',
				'type' => 'list',
				'values' => array(
					self::TOPIC_MAGAZINE => 'magazine',
					self::TOPIC_LATEST_STORIES => 'latest-stories'
				),
				'title' => 'Select your topic',
				'defaultValue' => 'Magazine'
			)
		),
		'global' => array(
			self::PARAMETER_FULL_ARTICLE => array(
				'name' => 'Full Article',
				'type' => 'checkbox',
				'title' => 'Enable to load full articles and other infos (takes longer)'
			)
		)
	);

	private $topicName = '';
	const CONTEXT = 'eyJjb250ZW50VHlwZSI6IlVuaXNvbkh1YiIsInZhcmlhYmxlcyI6eyJsb2NhdG9yIjoiL3BhZ2VzL3
			RvcGljL2xhdGVzdC1zdG9yaWVzIiwicG9ydGZvbGlvIjoibmF0Z2VvIiwicXVlcn
			lUeXBlIjoiTE9DQVRPUiJ9LCJtb2R1bGVJZCI6bnVsbH0';
	const LATEST_STORIES_ID = array(
		'1df278bb-0e3d-4a67-a0ce-8fae48392822-f2-m1'
	);
	const MAGAZINE_ID = array(
		'94d87d74-f41a-4a32-9acd-b591ba2df288-f2-m1',
		'94d87d74-f41a-4a32-9acd-b591ba2df288-f5-m2',
	);

	public function getURI() {
		switch ($this->queriedContext) {
			case self::CONTEXT_BY_TOPIC: {
				return self::URI . $this->getInput(self::PARAMETER_TOPIC);
			} break;
			default: {
				return parent::getURI();
			}
		}
	}

	private function getAPIURL($id) {
		$context = preg_replace('/\s*/m', '', self::CONTEXT);
		$url = 'https://www.nationalgeographic.com/proxy/hub?context='
						. $context . '&id=' . $id
						. '&moduleType=InfiniteFeedModule&_xhr=pageContent';
		return $url;
	}

	public function collectData() {
		$this->topicName = $this->getTopicName($this->getInput(self::PARAMETER_TOPIC));
		switch($this->topicName) {
			case self::TOPIC_MAGAZINE: {
				return $this->collectMagazine();
			} break;
			case self::TOPIC_LATEST_STORIES: {
				return $this->collectLatestStories();
			} break;
			default: {
				returnServerError('Unknown topic: "' . $this->topicName . '"');
			}
		}
	}

	public function getName() {
		switch ($this->queriedContext) {
			case self::CONTEXT_BY_TOPIC: {
				return static::NAME . ': ' . $this->topicName;
			} break;
			default: {
				return parent::getName();
			}
		}
	}

	private function getTopicName($topic) {
		return array_search($topic, static::PARAMETERS[self::CONTEXT_BY_TOPIC][self::PARAMETER_TOPIC]['values']);
	}

	private function collectMagazine() {
		$stories = array();

		foreach(self::MAGAZINE_ID as $id) {
			$uri = $this->getAPIURL($id);

			$json_raw = getContents($uri);

			$json = json_decode($json_raw, true)['tiles'];
			$stories = array_merge($json, $stories);
		}

		foreach($stories as $story) {
			$this->addStory($story);
		}
	}

	private function collectLatestStories() {
		$stories = array();

		foreach(self::LATEST_STORIES_ID as $id) {
			$uri = $this->getAPIURL($id);

			$json_raw = getContents($uri);

			$json = json_decode($json_raw, true)['tiles'];
			$stories = array_merge($stories, $json);
		}

		foreach($stories as $story) {
			$this->addStory($story);
		}
	}

	private function addStory($story) {
		$title = 'Unknown title';
		$content = '';
		$story_type = '';
		$uri = '';

		foreach($story['ctas'] as $component) {
			$uri = $component['url'];
			$story_type = $component['icon'];
		}

		$item = array();
		if(isset($story['description'])) {
			$content = '<p>' . $story['description'] . '</p>';
		}
		$title = $story['title'];
		$item['uri'] = $uri;
		$item['title'] = $story['title'];

		// if full article is requested!
		if ($this->getInput(self::PARAMETER_FULL_ARTICLE)) {
			if($story_type != 'interactive') {
				/* Nat Geo doesn't provided much info about interactive page
				*		and it requires JS to load the interactive.
				*/
				$article_data = $this->getFullArticle($item['uri']);
				$item['timestamp'] = $article_data['published_date'];
				$item['author'] = $article_data['authors'];
				$item['content'] = $content . $article_data['content'];
			} else {
				$item['content'] = $content;
			}
		} else
			$item['content'] = $content;

		$image = $story['img'];
		$item['enclosures'][] = $image['src'];

		$tags = $story['tags'];
		foreach($tags as $tag) {
			$tag_name = $tag['name'];
			$item['categories'][] = $tag_name;
		}

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

	private function filterArticleData($data) {
		$article_module = array_filter(
			$data, function ($item) {
				if(isset($item['id']) && $item['id'] == 'natgeo-template1-frame-1') {
					return true;
				}
			}
		);

		$article_data = array_reduce(
			$article_module,
			function (array $carry, array $item) {
				$module = $item['mods'];
				return array_merge(
					$carry,
					array_filter(
						$module, function ($data) {
							return $data['id'] == 'natgeo-template1-frame-1-module-1';
						}
					)
				);
			},
			array()
		);

		return $article_data[0];
	}

	private function handleImages($image_module, $image_type) {
		$image_alt = '';
		$image_credit = '';
		$image_src = '';
		$image_caption = '';
		$caption = '';
		switch($image_type) {
			case 'image':
			case 'imagegroup':
				$image = $image_module['image'];
				$image_src = $image['src'];
				if(isset($image_module['alt'])) {
					$image_alt = $image_module['alt'];
				} elseif(isset($image['altText'])) {
					$image_alt = $image['altText'];
				}
				if(isset($image['crdt'])) {
					$image_credit = $image['crdt'];
				}
				$caption = (isset($image_module['caption']) ? $image_module['caption'] : '');
				break;
			case 'photogallery':
				$image_credit = (isset($image_module['caption']['credit']) ? $image_module['caption']['credit'] : '');
				$caption = $image_module['caption']['text'];
				$image_src = $image_module['img']['src'];
				$image_alt = $image_module['img']['altText'];
				break;
			case 'video':
				$image_credit = (isset($image_module['credit']) ? $image_module['credit'] : '');
				$description = (isset($image_module['description']) ? $image_module['description'] : '');
				$caption = $description . ' Video can be watched on the article\'s page';
				$image = $image_module['image'];
				$image_alt = $image['altText'];
				$image_src = $image['src'];
		}

		$image_caption = $caption . ' ' . $image_credit
					. '. Notes: Some image may have copyrighted on it.';
		$wrapper = <<<EOD
<figure>
<img src="{$image_src}" alt="{$image_alt}">
<figcaption>$image_caption</figcaption>
</figure>
EOD;
		return $wrapper;
	}

	private function getFullArticle($uri) {
		$html = getContents($uri)
			or returnServerError('Could not load ' . $uri);

		$scriptRegex = '/window\[\'__natgeo__\'\]=(.*);<\/script>/';

		preg_match($scriptRegex, $html, $matches, PREG_OFFSET_CAPTURE, 0);

		$json = json_decode($matches[1][0], true);

		$unfiltered_data = $json['page']['content']['article']['frms'];
		$filtered_data = $this->filterArticleData($unfiltered_data);

		$article = $filtered_data['edgs'][0];

		$contributors = $article['cntrbGrp'];
		$authors = array();
		if(count($contributors) > 0) {
			$authors = $contributors[0]['contributors'];
		}

		$authors_name = '';
		$counter = 0;
		foreach($authors as $author) {
			$counter++;
			if($counter == count($authors)) {
				$authors_name .= $author['displayName'];
			} else {
				$authors_name .= $author['displayName'] . ', ';
			}
		}

		$published_date = $article['pbDt'];
		$article_body = $article['bdy'];
		$content = '';

		foreach($article_body as $body) {
			switch($body['type']) {
				case 'p':
					$content .= '<p>' . $body['cntnt']['mrkup'] . '</p>';
					break;
				case 'h2':
					$content .= '<h2>' . $body['cntnt']['mrkup'] . '</h2>';
					break;
				case 'inline':
					$module = $body['cntnt'];
					if(empty($module))
						continue 2;
					switch($module['cmsType']) {
						case 'image':
							$content .= $this->handleImages($module, $module['cmsType']);
							break;
						case 'imagegroup':
							$images = $module['images'];
							foreach($images as $image) {
								$content .= $this->handleImages($image, $module['cmsType']);
							}
							break;
						case 'editorsNote':
							$content .= $module['note'];
							break;
						case 'listicle':
							$content .= '<h2>' . $module['title'] . '</h2>';
							if(isset($module['image'])) {
								$content .= $this->handleImages($module['image'], $module['image']['cmsType']);
							}
							$content .= '<p>' . (isset($module['text']) ? $module['text'] : '') . '</p>';
							break;
						case 'photogallery':
							$gallery = $body['cntnt']['media'];
							foreach($gallery as $image) {
								$content .= $this->handleImages($image, $module['cmsType']);
							}
							break;
						case 'video':
							$content .= $this->handleImages($module, $module['cmsType']);
							break;
						case 'pullquote';
							$quote = $module['quote'];
							$author_name = '';
							$authors = (isset($module['byLineProps']['authors']) ? $module['byLineProps']['authors'] : array());
							foreach($authors as $author) {
								$author_desc = (isset($author['authorDesc']) ? $author['authorDesc'] : '');
								$author_name .= $author['displayName'] . ', ' . $author_desc;
							}
							$content .= <<<EOD
<figure>
<blockquote>
<p>$quote</p>
</blockquote>
<figcaption>$author_name</figcaption>
</figure>
EOD;
							break;
					}
					break;
				case 'ul':
					$content .= $body['cntnt']['mrkup'] . '<hr>';
					break;
			}
		}

		return array(
			'content' => $content,
			'published_date' => $published_date,
			'authors' => $authors_name
		);
	}
}