<?php

namespace Assetic\Factory;

use Assetic\AssetManager;
use Assetic\Factory\Loader\FormulaLoaderInterface;
use Assetic\Factory\Resource\ResourceInterface;

/**
 * A lazy asset manager is a composition of a factory and many formula loaders.
 *
 * @author Kris Wallsmith <kris.wallsmith@gmail.com>
 */
class LazyAssetManager extends AssetManager
{
	private $factory;
	private $loaders;
	private $resources;
	private $formulae;
	private $loaded;
	private $loading;


	/**
	 * Constructor.
	 *
	 * @param AssetFactory $factory The asset factory
	 * @param array        $loaders An array of loaders indexed by alias
	 */
	public function __construct(AssetFactory $factory, $loaders = array())
	{
		$this->factory = $factory;
		$this->loaders = array();
		$this->resources = array();
		$this->formulae = array();
		$this->loaded = false;
		$this->loading = false;

		foreach ($loaders as $alias => $loader) {
		    $this->setLoader($alias, $loader);
		}
	}


	/**
	 * Adds a loader to the asset manager.
	 *
	 * @param string                 $alias  An alias for the loader
	 * @param FormulaLoaderInterface $loader A loader
	 */
	public function setLoader($alias, FormulaLoaderInterface $loader)
	{
		$this->loaders[$alias] = $loader;
		$this->loaded = false;
	}


	/**
	 * Adds a resource to the asset manager.
	 *
	 * @param ResourceInterface $resource A resource
	 * @param string            $loader   The loader alias for this resource
	 */
	public function addResource(ResourceInterface $resource, $loader)
	{
		$this->resources[$loader][] = $resource;
		$this->loaded = false;
	}


	/**
	 * Returns an array of resources.
	 *
	 * @return array An array of resources
	 */
	public function getResources()
	{
		$resources = array();
		foreach ($this->resources as $r) {
		    $resources = array_merge($resources, $r);
		}

		return $resources;
	}


	/**
	 * Checks for an asset formula.
	 *
	 * @param string $name An asset name
	 *
	 * @return Boolean If there is a formula
	 */
	public function hasFormula($name)
	{
		if (!$this->loaded) {
		    $this->load();
		}

		return isset($this->formulae[$name]);
	}


	/**
	 * Returns an asset's formula.
	 *
	 * @param string $name An asset name
	 *
	 * @return array The formula
	 *
	 * @throws InvalidArgumentException If there is no formula by that name
	 */
	public function getFormula($name)
	{
		if (!$this->loaded) {
		    $this->load();
		}

		if (!isset($this->formulae[$name])) {
		    throw new \InvalidArgumentException(sprintf('There is no "%s" formula.', $name));
		}

		return $this->formulae[$name];
	}


	/**
	 * Sets a formula on the asset manager.
	 *
	 * @param string $name    An asset name
	 * @param array  $formula A formula
	 */
	public function setFormula($name, array $formula)
	{
		$this->formulae[$name] = $formula;
	}


	/**
	 * Loads formulae from resources.
	 *
	 * @throws LogicException If a resource has been added to an invalid loader
	 */
	public function load()
	{
		if ($this->loading) {
		    return;
		}

		if ($diff = array_diff(array_keys($this->resources), array_keys($this->loaders))) {
		    throw new \LogicException('The following loader(s) are not registered: '.implode(', ', $diff));
		}

		$this->loading = true;

		foreach ($this->resources as $loader => $resources) {
		    foreach ($resources as $resource) {
		        $this->formulae = array_replace($this->formulae, $this->loaders[$loader]->load($resource));
		    }
		}

		$this->loaded = true;
		$this->loading = false;
	}


	public function get($name)
	{
		if (!$this->loaded) {
		    $this->load();
		}

		if (!parent::has($name) && isset($this->formulae[$name])) {
		    list($inputs, $filters, $options) = $this->formulae[$name];
		    $options['name'] = $name;
		    parent::set($name, $this->factory->createAsset($inputs, $filters, $options));
		}

		return parent::get($name);
	}


	public function has($name)
	{
		if (!$this->loaded) {
		    $this->load();
		}

		return isset($this->formulae[$name]) || parent::has($name);
	}


	public function getNames()
	{
		if (!$this->loaded) {
		    $this->load();
		}

		return array_unique(array_merge(parent::getNames(), array_keys($this->formulae)));
	}


	public function isDebug()
	{
		return $this->factory->isDebug();
	}
}
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