<?php

require_once 'phing/Task.php';
require_once 'phing/util/FileUtils.php';
require_once 'System.php';
require_once "phing/tasks/ext/markdown/markdown.php";

class MarkdownTask extends Task {

	/**
	 * @var string Taskname for logger
	 */
	protected $taskName = 'Markdown';

	/**
	 * Result format, defaults to "html".
	 * @see $supportedFormats for all possible options
	 *
	 * @var string
	 */
	protected $format = 'html';

	/**
	 * Input file in markdown format.
	 * Required
	 *
	 * @var string
	 */
	protected $file = null;

	/**
	 * Output file or directory. May be omitted.
	 * When it ends with a slash, it is considered to be a directory
	 *
	 * @var string
	 */
	protected $destination = null;

	protected $removefilesetdir = null;

	protected $filesets      = array(); // all fileset objects assigned to this task
	protected $mapperElement = null;

	/**
	 * all filterchains objects assigned to this task
	 *
	 * @var array
	 */
	protected $filterChains = array();

	/**
	 * mode to create directories with
	 *
	 * @var integer
	 */
	protected $mode = 0755;

	/**
	 * Only render files whole source files are newer than the
	 * target files
	 *
	 * @var boolean
	 */
	protected $uptodate = false;

	/**
	 * The main entry point method.
	 *
	 * @return void
	 */
	public function main()
	{
		if (count($this->filterChains)) {
			$this->fileUtils = new FileUtils();
		}

		if ($this->file != '') {
			$file   = $this->file;
			$targetFile = $this->getTargetFile($file, $this->destination);
			$this->render($file, $targetFile);
			return;
		}

		if (!count($this->filesets)) {
			throw new BuildException(
				'"file" attribute or "fileset" subtag required'
			);
		}

		// process filesets
		$mapper = null;
		if ($this->mapperElement !== null) {
			$mapper = $this->mapperElement->getImplementation();
		}

		$project = $this->getProject();
		foreach ($this->filesets as $fs) {
			$ds = $fs->getDirectoryScanner($project);
			$fromDir  = $fs->getDir($project);
			$srcFiles = $ds->getIncludedFiles();

			foreach ($srcFiles as $src) {
				$file  = new PhingFile($fromDir, $src);
				if ($mapper !== null) {
					$results = $mapper->main($file);
					if ($results === null) {
						throw new BuildException(
							sprintf(
								'No filename mapper found for "%s"',
								$file
							)
						);
					}
					$targetFile = reset($results);
				} else {
					$targetFile = $this->getTargetFile($file, $this->destination);
				}
				$this->render($file, $targetFile);
			}
		}
	}

	/**
	 * Renders a single file and applies filters on it
	 *
	 * @param string $tool       conversion tool to use
	 * @param string $source     markdown source file
	 * @param string $targetFile target file name
	 *
	 * @return void
	 */
	protected function render($source, $targetFile)
	{
		if (count($this->filterChains) == 0) {
			return $this->renderFile($source, $targetFile);
		}

		$tmpTarget = tempnam(sys_get_temp_dir(), 'tmp-');
		$this->renderFile($source, $tmpTarget);

		$this->fileUtils->copyFile(
			new PhingFile($tmpTarget),
			new PhingFile($targetFile),
			true, false, $this->filterChains,
			$this->getProject(), $this->mode
		);
		unlink($tmpTarget);
	}

	/**
     * Renders a single file with the markdown tool.
     *
     * @param string $tool       conversion tool to use
     * @param string $source     markdown source file
     * @param string $targetFile target file name
     *
     * @return void
     *
     * @throws BuildException When the conversion fails
     */
	protected function renderFile($source, $targetFile)
	{
		if ($this->uptodate && file_exists($targetFile)
			&& filemtime($source) <= filemtime($targetFile)
		) {
			//target is up to date
			return;
		}
		//work around a bug in php by replacing /./ with /
		$targetDir = str_replace('/./', '/', dirname($targetFile));
		if (!is_dir($targetDir)) {
			mkdir($targetDir, $this->mode, true);
		}

		$arOutput = Markdown(file_get_contents($source));

		$retval = file_put_contents($targetFile,$arOutput);

		if ( ! $retval) {
			$this->log('File not rendered.', Project::MSG_INFO);
			throw new BuildException('Rendering markdown failed');
		}
		$this->log('File rendered.', Project::MSG_DEBUG);
	}

	/**
	 * Determines and returns the target file name from the
	 * input file and the configured destination name.
	 *
	 * @param string $file        Input file
	 * @param string $destination Destination file or directory name,
	 *                            may be null
	 *
	 * @return string Target file name
	 *
	 * @uses $format
	 * @uses $targetExt
	 */
	public function getTargetFile($file, $destination = null)
	{
		if ($destination != ''
			&& substr($destination, -1) !== '/'
			&& substr($destination, -1) !== '\\'
		) {
			return $destination;
		}

		if (strtolower(substr($file, -3)) == '.md') {
			$file = substr($file, 0, -3);
		}

		if($this->removefilesetdir)
			$file = str_replace($this->removefilesetdir.DIRECTORY_SEPARATOR,'',$file);

		return $destination . $file . '.'  . $this->format;
	}

	/**
	 * The setter for the attribute "file"
	 *
	 * @param string $file Path of file to render
	 *
	 * @return void
	 */
	public function setFile($file)
	{
		$this->file = $file;
	}

	/**
	 * The setter for the attribute "destination"
	 *
	 * @param string $destination Output file or directory. When it ends
	 *                            with a slash, it is taken as directory.
	 *
	 * @return void
	 */
	public function setDestination($destination)
	{
		$this->destination = $destination;
	}

	/**
	 * The setter for the attribute "destination"
	 *
	 * @param string $destination Output file or directory. When it ends
	 *                            with a slash, it is taken as directory.
	 *
	 * @return void
	 */
	public function setRemovefilesetdir($removefilesetdir)
	{
		$this->removefilesetdir = $removefilesetdir;
	}

	/**
	 * The setter for the attribute "uptodate"
	 *
	 * @param string $uptodate True/false
	 *
	 * @return void
	 */
	public function setUptodate($uptodate)
	{
		$this->uptodate = (boolean)$uptodate;
	}

	/**
	 * Nested creator, creates a FileSet for this task
	 *
	 * @return object The created fileset object
	 */
	public function createFileSet()
	{
		$num = array_push($this->filesets, new FileSet());
		return $this->filesets[$num-1];
	}

	/**
	 * Nested creator, creates one Mapper for this task
	 *
	 * @return Mapper The created Mapper type object
	 *
	 * @throws BuildException
	 */
	public function createMapper()
	{
		if ($this->mapperElement !== null) {
			throw new BuildException(
				'Cannot define more than one mapper', $this->location
			);
		}
		$this->mapperElement = new Mapper($this->project);
		return $this->mapperElement;
	}

	/**
	 * Creates a filterchain, stores and returns it
	 *
	 * @return FilterChain The created filterchain object
	 */
	public function createFilterChain()
	{
		$num = array_push($this->filterChains, new FilterChain($this->project));
		return $this->filterChains[$num-1];
	}
}