<?php
require_once(__DIR__ . '/BridgeInterface.php');
abstract class BridgeAbstract implements BridgeInterface
{
	const NAME = 'Unnamed bridge';
	const URI = '';
	const DESCRIPTION = 'No description provided';
	const MAINTAINER = 'No maintainer';
	const CACHE_TIMEOUT = 3600;
	const PARAMETERS = array();

	protected $cache;
	protected $items = array();
	protected $inputs = array();
	protected $queriedContext = '';

	/**
	* Return items stored in the bridge
	* @return mixed
	*/
	public function getItems()
	{
		return $this->items;
	}


	protected function setInputs(array $inputs, $queriedContext)
	{
		// Import and assign all inputs to their context
		foreach ($inputs as $name => $value) {
			foreach (static::PARAMETERS as $context => $set) {
				if (array_key_exists($name, static::PARAMETERS[$context])) {
					$this->inputs[$context][$name]['value'] = $value;
				}
			}
		}

		// Apply default values to missing data
		$contexts = array($queriedContext);
		if (array_key_exists('global', static::PARAMETERS)) {
			$contexts[] = 'global';
		}

		foreach ($contexts as $context) {
			foreach (static::PARAMETERS[$context] as $name => $properties) {
				if (isset($this->inputs[$context][$name]['value'])) {
					continue;
				}

				$type = isset($properties['type']) ? $properties['type'] : 'text';

				switch ($type) {
				case 'checkbox':
					if (!isset($properties['defaultValue'])) {
						$this->inputs[$context][$name]['value'] = false;
					} else {
						$this->inputs[$context][$name]['value'] = $properties['defaultValue'];
					}
					break;
				case 'list':
					if (!isset($properties['defaultValue'])) {
						$firstItem = reset($properties['values']);
						if (is_array($firstItem)) {
							$firstItem = reset($firstItem);
						}
						$this->inputs[$context][$name]['value'] = $firstItem;
					} else {
						$this->inputs[$context][$name]['value'] = $properties['defaultValue'];
					}
					break;
				default:
					if (isset($properties['defaultValue'])) {
						$this->inputs[$context][$name]['value'] = $properties['defaultValue'];
					}
					break;
				}
			}
		}

		// Copy global parameter values to the guessed context
		if (array_key_exists('global', static::PARAMETERS)) {
			foreach (static::PARAMETERS['global'] as $name => $properties) {
				if (isset($inputs[$name])) {
					$value = $inputs[$name];
				} elseif (isset($properties['value'])) {
					$value = $properties['value'];
				} else {
					continue;
				}
				$this->inputs[$queriedContext][$name]['value'] = $value;
			}
		}

		// Only keep guessed context parameters values
		if (isset($this->inputs[$queriedContext])) {
			$this->inputs = array($queriedContext => $this->inputs[$queriedContext]);
		} else {
			$this->inputs = array();
		}
	}

	protected function getQueriedContext(array $inputs)
	{
		$queriedContexts = array();
		foreach (static::PARAMETERS as $context => $set) {
			$queriedContexts[$context] = null;
			foreach ($set as $id => $properties) {
				if (isset($inputs[$id]) && !empty($inputs[$id])) {
					$queriedContexts[$context] = true;
				} elseif (isset($properties['required'])
				&& $properties['required'] === true) {
					$queriedContexts[$context] = false;
					break;
				}
			}
		}

		if (array_key_exists('global', static::PARAMETERS)
		&& $queriedContexts['global'] === false) {
			return null;
		}
		unset($queriedContexts['global']);

		switch (array_sum($queriedContexts)) {
		case 0:
			foreach ($queriedContexts as $context => $queried) {
				if (is_null($queried)) {
					return $context;
				}
			}
			return null;
		case 1: return array_search(true, $queriedContexts);
		default: return false;
		}
	}

	/**
	* Defined datas with parameters depending choose bridge
	* Note : you can define a cache with "setCache"
	* @param array array with expected bridge paramters
	*/
	public function setDatas(array $inputs)
	{
		if (!is_null($this->cache)) {
			$time = $this->cache->getTime();
			if ($time !== false
			&& (time() - static::CACHE_TIMEOUT < $time)
			&& (!defined('DEBUG') || DEBUG !== true)) {
				$this->items = $this->cache->loadData();
				return;
			}
		}

		if (empty(static::PARAMETERS)) {
			if (!empty($inputs)) {
				returnClientError('Invalid parameters value(s)');
			}

			$this->collectData();
			if (!is_null($this->cache)) {
				$this->cache->saveData($this->getItems());
			}
			return;
		}

		if (!validateData($inputs, static::PARAMETERS)) {
			returnClientError('Invalid parameters value(s)');
		}

		// Guess the paramter context from input data
		$this->queriedContext = $this->getQueriedContext($inputs);
		if (is_null($this->queriedContext)) {
			returnClientError('Required parameter(s) missing');
		} elseif ($this->queriedContext === false) {
			returnClientError('Mixed context parameters');
		}

		$this->setInputs($inputs, $this->queriedContext);

		$this->collectData();

		if (!is_null($this->cache)) {
			$this->cache->saveData($this->getItems());
		}
	}

	public function getInput($input)
	{
		if (!isset($this->inputs[$this->queriedContext][$input]['value'])) {
			return null;
		}
		return $this->inputs[$this->queriedContext][$input]['value'];
	}

	public function getName()
	{
		return static::NAME;
	}

	public function getURI()
	{
		return static::URI;
	}
	
	public function getExtraInfos()
	{
		$extraInfos = array();
		$extraInfos['name']= $this->getName();
		$extraInfos['uri']= $this->getURI();
		return $extraInfos;
	}

	public function setCache(\CacheInterface $cache)
	{
		$this->cache = $cache;
	}
}