<?php
/**
* This class implements a bridge for http://www.instructables.com, supporting
* general feeds and feeds by category.
*
* Remarks:
* - For some reason it is very important to have the category URI end with a
*	slash, otherwise the site defaults to the main category (i.e. Technology)!
*	If you need to update the categories list, enable the 'listCategories'
*	function (see comments below) and run the bridge with format=Html (see page
*	source)
*/
class InstructablesBridge extends BridgeAbstract {
	const NAME = 'Instructables Bridge';
	const URI = 'https://www.instructables.com';
	const DESCRIPTION = 'Returns general feeds and feeds by category';
	const MAINTAINER = 'logmanoriginal';
	const PARAMETERS = array(
		'Category' => array(
			'category' => array(
				'name' => 'Category',
				'type' => 'list',
				'values' => array(
					'Circuits' => array(
						'All' => '/circuits/',
						'Apple' => '/circuits/apple/projects/',
						'Arduino' => '/circuits/arduino/projects/',
						'Art' => '/circuits/art/projects/',
						'Assistive Tech' => '/circuits/assistive-tech/projects/',
						'Audio' => '/circuits/audio/projects/',
						'Cameras' => '/circuits/cameras/projects/',
						'Clocks' => '/circuits/clocks/projects/',
						'Computers' => '/circuits/computers/projects/',
						'Electronics' => '/circuits/electronics/projects/',
						'Gadgets' => '/circuits/gadgets/projects/',
						'Lasers' => '/circuits/lasers/projects/',
						'LEDs' => '/circuits/leds/projects/',
						'Linux' => '/circuits/linux/projects/',
						'Microcontrollers' => '/circuits/microcontrollers/projects/',
						'Microsoft' => '/circuits/microsoft/projects/',
						'Mobile' => '/circuits/mobile/projects/',
						'Raspberry Pi' => '/circuits/raspberry-pi/projects/',
						'Remote Control' => '/circuits/remote-control/projects/',
						'Reuse' => '/circuits/reuse/projects/',
						'Robots' => '/circuits/robots/projects/',
						'Sensors' => '/circuits/sensors/projects/',
						'Software' => '/circuits/software/projects/',
						'Soldering' => '/circuits/soldering/projects/',
						'Speakers' => '/circuits/speakers/projects/',
						'Tools' => '/circuits/tools/projects/',
						'USB' => '/circuits/usb/projects/',
						'Wearables' => '/circuits/wearables/projects/',
						'Websites' => '/circuits/websites/projects/',
						'Wireless' => '/circuits/wireless/projects/',
					),
					'Workshop' => array(
						'All' => '/workshop/',
						'3D Printing' => '/workshop/3d-printing/projects/',
						'Cars' => '/workshop/cars/projects/',
						'CNC' => '/workshop/cnc/projects/',
						'Electric Vehicles' => '/workshop/electric-vehicles/projects/',
						'Energy' => '/workshop/energy/projects/',
						'Furniture' => '/workshop/furniture/projects/',
						'Home Improvement' => '/workshop/home-improvement/projects/',
						'Home Theater' => '/workshop/home-theater/projects/',
						'Hydroponics' => '/workshop/hydroponics/projects/',
						'Knives' => '/workshop/knives/projects/',
						'Laser Cutting' => '/workshop/laser-cutting/projects/',
						'Lighting' => '/workshop/lighting/projects/',
						'Metalworking' => '/workshop/metalworking/projects/',
						'Molds & Casting' => '/workshop/molds-and-casting/projects/',
						'Motorcycles' => '/workshop/motorcycles/projects/',
						'Organizing' => '/workshop/organizing/projects/',
						'Pallets' => '/workshop/pallets/projects/',
						'Repair' => '/workshop/repair/projects/',
						'Science' => '/workshop/science/projects/',
						'Shelves' => '/workshop/shelves/projects/',
						'Solar' => '/workshop/solar/projects/',
						'Tools' => '/workshop/tools/projects/',
						'Woodworking' => '/workshop/woodworking/projects/',
						'Workbenches' => '/workshop/workbenches/projects/',
					),
					'Craft' => array(
						'All' => '/craft/',
						'Art' => '/craft/art/projects/',
						'Books & Journals' => '/craft/books-and-journals/projects/',
						'Cardboard' => '/craft/cardboard/projects/',
						'Cards' => '/craft/cards/projects/',
						'Clay' => '/craft/clay/projects/',
						'Costumes & Cosplay' => '/craft/costumes-and-cosplay/projects/',
						'Digital Graphics' => '/craft/digital-graphics/projects/',
						'Duct Tape' => '/craft/duct-tape/projects/',
						'Embroidery' => '/craft/embroidery/projects/',
						'Fashion' => '/craft/fashion/projects/',
						'Felt' => '/craft/felt/projects/',
						'Fiber Arts' => '/craft/fiber-arts/projects/',
						'Gift Wrapping' => '/craft/gift-wrapping/projects/',
						'Jewelry' => '/craft/jewelry/projects/',
						'Knitting & Crochet' => '/craft/knitting-and-crochet/projects/',
						'Leather' => '/craft/leather/projects/',
						'Mason Jars' => '/craft/mason-jars/projects/',
						'No-Sew' => '/craft/no-sew/projects/',
						'Paper' => '/craft/paper/projects/',
						'Parties & Weddings' => '/craft/parties-and-weddings/projects/',
						'Photography' => '/craft/photography/projects/',
						'Printmaking' => '/craft/printmaking/projects/',
						'Reuse' => '/craft/reuse/projects/',
						'Sewing' => '/craft/sewing/projects/',
						'Soapmaking' => '/craft/soapmaking/projects/',
						'Wallets' => '/craft/wallets/projects/',
					),
					'Cooking' => array(
						'All' => '/cooking/',
						'Bacon' => '/cooking/bacon/projects/',
						'BBQ & Grilling' => '/cooking/bbq-and-grilling/projects/',
						'Beverages' => '/cooking/beverages/projects/',
						'Bread' => '/cooking/bread/projects/',
						'Breakfast' => '/cooking/breakfast/projects/',
						'Cake' => '/cooking/cake/projects/',
						'Candy' => '/cooking/candy/projects/',
						'Canning & Preserving' => '/cooking/canning-and-preserving/projects/',
						'Cocktails & Mocktails' => '/cooking/cocktails-and-mocktails/projects/',
						'Coffee' => '/cooking/coffee/projects/',
						'Cookies' => '/cooking/cookies/projects/',
						'Cupcakes' => '/cooking/cupcakes/projects/',
						'Dessert' => '/cooking/dessert/projects/',
						'Homebrew' => '/cooking/homebrew/projects/',
						'Main Course' => '/cooking/main-course/projects/',
						'Pasta' => '/cooking/pasta/projects/',
						'Pie' => '/cooking/pie/projects/',
						'Pizza' => '/cooking/pizza/projects/',
						'Salad' => '/cooking/salad/projects/',
						'Sandwiches' => '/cooking/sandwiches/projects/',
						'Snacks & Appetizers' => '/cooking/snacks-and-appetizers/projects/',
						'Soups & Stews' => '/cooking/soups-and-stews/projects/',
						'Vegetarian & Vegan' => '/cooking/vegetarian-and-vegan/projects/',
					),
					'Living' => array(
						'All' => '/living/',
						'Beauty' => '/living/beauty/projects/',
						'Christmas' => '/living/christmas/projects/',
						'Cleaning' => '/living/cleaning/projects/',
						'Decorating' => '/living/decorating/projects/',
						'Education' => '/living/education/projects/',
						'Gardening' => '/living/gardening/projects/',
						'Halloween' => '/living/halloween/projects/',
						'Health' => '/living/health/projects/',
						'Hiding Places' => '/living/hiding-places/projects/',
						'Holidays' => '/living/holidays/projects/',
						'Homesteading' => '/living/homesteading/projects/',
						'Kids' => '/living/kids/projects/',
						'Kitchen' => '/living/kitchen/projects/',
						'LEGO & KNEX' => '/living/lego-and-knex/projects/',
						'Life Hacks' => '/living/life-hacks/projects/',
						'Music' => '/living/music/projects/',
						'Office Supply Hacks' => '/living/office-supply-hacks/projects/',
						'Organizing' => '/living/organizing/projects/',
						'Pest Control' => '/living/pest-control/projects/',
						'Pets' => '/living/pets/projects/',
						'Pranks, Tricks, & Humor' => '/living/pranks-tricks-and-humor/projects/',
						'Relationships' => '/living/relationships/projects/',
						'Toys & Games' => '/living/toys-and-games/projects/',
						'Travel' => '/living/travel/projects/',
						'Video Games' => '/living/video-games/projects/',
					),
					'Outside' => array(
						'All' => '/outside/',
						'Backyard' => '/outside/backyard/projects/',
						'Beach' => '/outside/beach/projects/',
						'Bikes' => '/outside/bikes/projects/',
						'Birding' => '/outside/birding/projects/',
						'Boats' => '/outside/boats/projects/',
						'Camping' => '/outside/camping/projects/',
						'Climbing' => '/outside/climbing/projects/',
						'Fire' => '/outside/fire/projects/',
						'Fishing' => '/outside/fishing/projects/',
						'Hunting' => '/outside/hunting/projects/',
						'Kites' => '/outside/kites/projects/',
						'Knots' => '/outside/knots/projects/',
						'Launchers' => '/outside/launchers/projects/',
						'Paracord' => '/outside/paracord/projects/',
						'Rockets' => '/outside/rockets/projects/',
						'Siege Engines' => '/outside/siege-engines/projects/',
						'Skateboarding' => '/outside/skateboarding/projects/',
						'Snow' => '/outside/snow/projects/',
						'Sports' => '/outside/sports/projects/',
						'Survival' => '/outside/survival/projects/',
						'Water' => '/outside/water/projects/',
					),
					'Makeymakey' => array(
						'All' => '/makeymakey/',
						'Makey Makey on Instructables' => '/makeymakey/',
					),
					'Teachers' => array(
						'All' => '/teachers/',
						'ELA' => '/teachers/ela/projects/',
						'Math' => '/teachers/math/projects/',
						'Science' => '/teachers/science/projects/',
						'Social Studies' => '/teachers/social-studies/projects/',
						'Engineering' => '/teachers/engineering/projects/',
						'Coding' => '/teachers/coding/projects/',
						'Electronics' => '/teachers/electronics/projects/',
						'Robotics' => '/teachers/robotics/projects/',
						'Arduino' => '/teachers/arduino/projects/',
						'CNC' => '/teachers/cnc/projects/',
						'Laser Cutting' => '/teachers/laser-cutting/projects/',
						'3D Printing' => '/teachers/3d-printing/projects/',
						'3D Design' => '/teachers/3d-design/projects/',
						'Art' => '/teachers/art/projects/',
						'Music' => '/teachers/music/projects/',
						'Theatre' => '/teachers/theatre/projects/',
						'Wood Shop' => '/teachers/wood-shop/projects/',
						'Metal Shop' => '/teachers/metal-shop/projects/',
						'Resources' => '/teachers/resources/projects/',
					),
				),
				'title' => 'Select your category (required)',
				'defaultValue' => 'Technology'
			),
			'filter' => array(
				'name' => 'Filter',
				'type' => 'list',
				'values' => array(
					'Featured' => ' ',
					'Recent' => 'recent/',
					'Popular' => 'popular/',
					'Views' => 'views/',
					'Contest Winners' => 'winners/'
				),
				'title' => 'Select a filter',
				'defaultValue' => 'Featured'
			)
		)
	);

	private $uri;

	public function collectData() {
		// Enable the following line to get the category list (dev mode)
		// $this->listCategories();

		$this->uri = static::URI;

		switch($this->queriedContext) {
			case 'Category': $this->uri .= $this->getInput('category') . $this->getInput('filter');
		}

		$html = getSimpleHTMLDOM($this->uri)
				or returnServerError('Error loading category ' . $this->uri);

		foreach($html->find('ul.explore-covers-list li') as $cover) {
			$item = array();

			$item['uri'] = static::URI . $cover->find('a.cover-image', 0)->href;
			$item['title'] = $cover->find('.title', 0)->innertext;
			$item['author'] = $this->getCategoryAuthor($cover);
			$item['content'] = '<a href='
			. $item['uri']
			. '><img src='
			. $cover->find('a.cover-image img', 0)->src
			. '></a>';

			$image = str_replace('.RECTANGLE1', '.LARGE', $cover->find('a.cover-image img', 0)->src);
			$item['enclosures'] = [$image];

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

	public function getName() {
		if(!is_null($this->getInput('category'))
		&& !is_null($this->getInput('filter'))) {
			foreach(self::PARAMETERS[$this->queriedContext]['category']['values'] as $key => $value) {
				$subcategory = array_search($this->getInput('category'), $value);

				if($subcategory !== false)
					break;
			}

			$filter = array_search(
				$this->getInput('filter'),
				self::PARAMETERS[$this->queriedContext]['filter']['values']
			);

			return $subcategory . ' (' . $filter . ') - ' . static::NAME;
		}

		return parent::getName();
	}

	public function getURI() {
		if(!is_null($this->getInput('category'))
		&& !is_null($this->getInput('filter'))) {
			return $this->uri;
		}

		return parent::getURI();
	}

	/**
	 * Returns a list of categories for development purposes (used to build the
	 * parameters list)
	 */
	private function listCategories(){

		// Use home page to acquire main categories
		$html = getSimpleHTMLDOM(self::URI);
		$html = defaultLinkTo($html, self::URI);

		foreach($html->find('.home-content-explore-link') as $category) {

			// Use arbitrary category to receive full list
			$html = getSimpleHTMLDOM($category->href);

			foreach($html->find('.channel-thumbnail a') as $channel) {
				$name = html_entity_decode(trim($channel->title));

				// Remove unwanted entities
				$name = str_replace("'", '', $name);
				$name = str_replace('&#39;', '', $name);

				$uri = $channel->href;

				$category_name = explode('/', $uri)[1];

				if(!isset($categories)
				|| !array_key_exists($category_name, $categories)
				|| !in_array($uri, $categories[$category_name]))
					$categories[$category_name][$name] = $uri;
			}
		}

		// Build PHP array manually
		foreach($categories as $key => $value) {
			$name = ucfirst($key);
			echo "'{$name}' => array(\n";
			echo "\t'All' => '/{$key}/',\n";
			foreach($value as $name => $uri) {
				echo "\t'{$name}' => '{$uri}',\n";
			}
			echo "),\n";
		}

		die;
	}

	/**
	 * Returns the author as anchor for a given cover.
	 */
	private function getCategoryAuthor($cover) {
		return '<a href='
		. static::URI . $cover->find('span.author a', 0)->href
		. '>'
		. $cover->find('span.author a', 0)->innertext
		. '</a>';
	}
}