<?php

/**
 * Contains the description of a user query
 *
 * It allows to extract the meaningful bits of the query to be manipulated in an
 * easy way.
 */
class FreshRSS_UserQuery {

	private $deprecated = false;
	private $get;
	private $get_name;
	private $get_type;
	private $name;
	private $order;
	private $search;
	private $state;
	private $url;
	private $feed_dao;
	private $category_dao;

	/**
	 * @param array $query
	 * @param FreshRSS_Searchable $feed_dao
	 * @param FreshRSS_Searchable $category_dao
	 */
	public function __construct($query, FreshRSS_Searchable $feed_dao = null, FreshRSS_Searchable $category_dao = null) {
		$this->category_dao = $category_dao;
		$this->feed_dao = $feed_dao;
		if (isset($query['get'])) {
			$this->parseGet($query['get']);
		}
		if (isset($query['name'])) {
			$this->name = $query['name'];
		}
		if (isset($query['order'])) {
			$this->order = $query['order'];
		}
		if (!isset($query['search'])) {
			$query['search'] = '';
		}
		// linked to deeply with the search object, need to use dependency injection
		$this->search = new FreshRSS_Search($query['search']);
		if (isset($query['state'])) {
			$this->state = $query['state'];
		}
		if (isset($query['url'])) {
			$this->url = $query['url'];
		}
	}

	/**
	 * Convert the current object to an array.
	 *
	 * @return array
	 */
	public function toArray() {
		return array_filter(array(
		    'get' => $this->get,
		    'name' => $this->name,
		    'order' => $this->order,
		    'search' => $this->search->__toString(),
		    'state' => $this->state,
		    'url' => $this->url,
		));
	}

	/**
	 * Parse the get parameter in the query string to extract its name and
	 * type
	 *
	 * @param string $get
	 */
	private function parseGet($get) {
		$this->get = $get;
		if (preg_match('/(?P<type>[acfs])(_(?P<id>\d+))?/', $get, $matches)) {
			switch ($matches['type']) {
				case 'a':
					$this->parseAll();
					break;
				case 'c':
					$this->parseCategory($matches['id']);
					break;
				case 'f':
					$this->parseFeed($matches['id']);
					break;
				case 's':
					$this->parseFavorite();
					break;
			}
		}
	}

	/**
	 * Parse the query string when it is an "all" query
	 */
	private function parseAll() {
		$this->get_name = 'all';
		$this->get_type = 'all';
	}

	/**
	 * Parse the query string when it is a "category" query
	 *
	 * @param integer $id
	 * @throws FreshRSS_DAO_Exception
	 */
	private function parseCategory($id) {
		if (is_null($this->category_dao)) {
			throw new FreshRSS_DAO_Exception('Category DAO is not loaded in UserQuery');
		}
		$category = $this->category_dao->searchById($id);
		if ($category) {
			$this->get_name = $category->name();
		} else {
			$this->deprecated = true;
		}
		$this->get_type = 'category';
	}

	/**
	 * Parse the query string when it is a "feed" query
	 *
	 * @param integer $id
	 * @throws FreshRSS_DAO_Exception
	 */
	private function parseFeed($id) {
		if (is_null($this->feed_dao)) {
			throw new FreshRSS_DAO_Exception('Feed DAO is not loaded in UserQuery');
		}
		$feed = $this->feed_dao->searchById($id);
		if ($feed) {
			$this->get_name = $feed->name();
		} else {
			$this->deprecated = true;
		}
		$this->get_type = 'feed';
	}

	/**
	 * Parse the query string when it is a "favorite" query
	 */
	private function parseFavorite() {
		$this->get_name = 'favorite';
		$this->get_type = 'favorite';
	}

	/**
	 * Check if the current user query is deprecated.
	 * It is deprecated if the category or the feed used in the query are
	 * not existing.
	 *
	 * @return boolean
	 */
	public function isDeprecated() {
		return $this->deprecated;
	}

	/**
	 * Check if the user query has parameters.
	 * If the type is 'all', it is considered equal to no parameters
	 *
	 * @return boolean
	 */
	public function hasParameters() {
		if ($this->get_type === 'all') {
			return false;
		}
		if ($this->hasSearch()) {
			return true;
		}
		if ($this->state) {
			return true;
		}
		if ($this->order) {
			return true;
		}
		if ($this->get) {
			return true;
		}
		return false;
	}

	/**
	 * Check if there is a search in the search object
	 *
	 * @return boolean
	 */
	public function hasSearch() {
		return $this->search->getRawInput() != "";
	}

	public function getGet() {
		return $this->get;
	}

	public function getGetName() {
		return $this->get_name;
	}

	public function getGetType() {
		return $this->get_type;
	}

	public function getName() {
		return $this->name;
	}

	public function getOrder() {
		return $this->order;
	}

	public function getSearch() {
		return $this->search;
	}

	public function getState() {
		return $this->state;
	}

	public function getUrl() {
		return $this->url;
	}

}
