<?php

namespace Assetic\Factory\Resource;

/**
 * A resource is something formulae can be loaded from.
 *
 * @author Kris Wallsmith <kris.wallsmith@gmail.com>
 */
class DirectoryResource implements IteratorResourceInterface
{
	private $path;
	private $pattern;


	/**
	 * Constructor.
	 *
	 * @param string $path    A directory path
	 * @param string $pattern A filename pattern
	 */
	public function __construct($path, $pattern = null)
	{
		if (DIRECTORY_SEPARATOR != substr($path, -1)) {
		    $path .= DIRECTORY_SEPARATOR;
		}

		$this->path = $path;
		$this->pattern = $pattern;
	}


	public function isFresh($timestamp)
	{
		if (!is_dir($this->path) || filemtime($this->path) > $timestamp) {
		    return false;
		}

		foreach ($this as $resource) {
		    if (!$resource->isFresh($timestamp)) {
		        return false;
		    }
		}

		return true;
	}


	/**
	 * Returns the combined content of all inner resources.
	 */
	public function getContent()
	{
		$content = array();
		foreach ($this as $resource) {
		    $content[] = $resource->getContent();
		}

		return implode("\n", $content);
	}


	public function __toString()
	{
		return $this->path;
	}


	public function getIterator()
	{
		return is_dir($this->path)
		    ? new DirectoryResourceIterator($this->getInnerIterator())
		    : new \EmptyIterator();
	}


	protected function getInnerIterator()
	{
		return new DirectoryResourceFilterIterator(new \RecursiveDirectoryIterator($this->path, \RecursiveDirectoryIterator::FOLLOW_SYMLINKS), $this->pattern);
	}
}

/**
 * An iterator that converts file objects into file resources.
 *
 * @author Kris Wallsmith <kris.wallsmith@gmail.com>
 * @access private
 */
class DirectoryResourceIterator extends \RecursiveIteratorIterator
{
	public function current()
	{
		return new FileResource(parent::current()->getPathname());
	}
}

/**
 * Filters files by a basename pattern.
 *
 * @author Kris Wallsmith <kris.wallsmith@gmail.com>
 * @access private
 */
class DirectoryResourceFilterIterator extends \RecursiveFilterIterator
{
	protected $pattern;


	public function __construct(\RecursiveDirectoryIterator $iterator, $pattern = null)
	{
		parent::__construct($iterator);

		$this->pattern = $pattern;
	}


	public function accept()
	{
		$file = $this->current();
		$name = $file->getBasename();

		if ($file->isDir()) {
		    return '.' != $name[0];
		} else {
		    return null === $this->pattern || 0 < preg_match($this->pattern, $name);
		}
	}


	public function getChildren()
	{
		return new self(new \RecursiveDirectoryIterator($this->current()->getPathname(), \RecursiveDirectoryIterator::FOLLOW_SYMLINKS), $this->pattern);
	}
}
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