<?php
/**
 * A shell class to help developers upgrade applications to CakePHP 2.0
 *
 * @package cake.console/shells
 */
class UpgradeShell extends Shell {

	protected $_files = array();
	protected $_paths = array();

/**
 * Shell startup, prints info message about dry run.
 *
 * @return void
 */
	function startup() {
		parent::startup();
		if ($this->params['dry-run']) {
			$this->out('<warning>Dry-run mode enabled!</warning>', 1, Shell::QUIET);
		}
	}

	function all() {
		foreach($this->OptionParser->subcommands() as $command) {
			$name = $command->name();
			if ($name === 'all') {
				continue;
			}
			$this->out('Running ' . $name);
			$this->$name();
		}
	}

/**
 * Update helpers.
 *
 * - Converts helpers usage to new format.
 *
 * @return void
 */
	function helpers() {
		$this->_paths = array_diff(App::path('views'), App::core('views'));

		if (!empty($this->params['plugin'])) {
			$this->_paths = array(App::pluginPath($this->params['plugin']) . 'views' . DS);
		}

		$patterns = array();
		$helpers = App::objects('helper');
		$plugins = App::objects('plugin');
		$pluginHelpers = array();
		foreach ($plugins as $plugin) {
			$pluginHelpers = array_merge(
				$pluginHelpers,
				App::objects('helper', App::pluginPath($plugin) . DS . 'views' . DS . 'helpers' . DS, false)
			);
		}
		$helpers = array_merge($pluginHelpers, $helpers);
		foreach ($helpers as $helper) {
			$oldHelper = strtolower(substr($helper, 0, 1)).substr($helper, 1);
			$patterns[] = array(
				"\${$oldHelper} to \$this->{$helper}",
				"/\\\${$oldHelper}->/",
				"\\\$this->{$helper}->"
			);
		}

		$this->_filesRegexpUpdate($patterns);
	}

/**
 * Update i18n.
 *
 * - Removes extra true param.
 * - Add the echo to __*() calls that didn't need them before.
 *
 * @return void
 */
	function i18n() {
		$this->_paths = array(
			APP
		);
		if (!empty($this->params['plugin'])) {
			$this->_paths = array(App::pluginPath($this->params['plugin']));
		}

		$patterns = array(
			array(
				'<?php __*(*) to <?php echo __*(*)',
				'/<\?php\s*(__[a-z]*\(.*?\))/',
				'<?php echo \1'
			),
			array(
				'<?php __*(*, true) to <?php echo __*()',
				'/<\?php\s*(__[a-z]*\(.*?)(,\s*true)(\))/',
				'<?php echo \1\3'
			),
			array('__*(*, true) to __*(*)', '/(__[a-z]*\(.*?)(,\s*true)(\))/', '\1\3')
		);

		$this->_filesRegexpUpdate($patterns);
	}

/**
 * Upgrade the removed basics functions.
 *
 * - a(*) -> array(*)
 * - e(*) -> echo *
 * - ife(*, *, *) -> empty(*) ? * : *
 * - a(*) -> array(*)
 * - r(*, *, *) -> str_replace(*, *, *)
 * - up(*) -> strtoupper(*)
 * - low(*, *, *) -> strtolower(*)
 * - getMicrotime() -> microtime(true)
 *
 * @return void
 */
	public function basics() {
		$this->_paths = array(
			APP
		);
		if (!empty($this->params['plugin'])) {
			$this->_paths = array(App::pluginPath($this->params['plugin']));
		}
		$patterns = array(
			array(
				'a(*) -> array(*)',
				'/\ba\((.*)\)/',
				'array(\1)'
			),
			array(
				'e(*) -> echo *',
				'/\be\((.*)\)/',
				'echo \1'
			),
			array(
				'ife(*, *, *) -> empty(*) ? * : *',
				'/ife\((.*), (.*), (.*)\)/',
				'empty(\1) ? \2 : \3'
			),
			array(
				'r(*, *, *) -> str_replace(*, *, *)',
				'/\br\(/',
				'str_replace('
			),
			array(
				'up(*) -> strtoupper(*)',
				'/\bup\(/',
				'strtoupper('
			),
			array(
				'low(*) -> strtolower(*)',
				'/\blow\(/',
				'strtolower('
			),
			array(
				'getMicrotime() -> microtime(true)',
				'/getMicrotime\(\)/',
				'microtime(true)'
			),
		);
		$this->_filesRegexpUpdate($patterns);
	}

/**
 * Update the properties moved to CakeRequest.
 *
 * @return void
 */
	public function request() {
		$views = array_diff(App::path('views'), App::core('views'));
		$controllers = array_diff(App::path('controllers'), App::core('controllers'), array(APP));
		$components = array_diff(App::path('components'), App::core('components'));

		$this->_paths = array_merge($views, $controllers, $components);

		if (!empty($this->params['plugin'])) {
			$pluginPath = App::pluginPath($this->params['plugin']);
			$this->_paths = array(
				$pluginPath . 'controllers' . DS,
				$pluginPath . 'controllers' . DS . 'components' .DS,
				$pluginPath . 'views' . DS,
			);
		}
		$patterns = array(
			array(
				'$this->data -> $this->request->data',
				'/(\$this->data\b(?!\())/',
				'$this->request->data'
			),
			array(
				'$this->params -> $this->request->params',
				'/(\$this->params\b(?!\())/',
				'$this->request->params'
			),
			array(
				'$this->webroot -> $this->request->webroot',
				'/(\$this->webroot\b(?!\())/',
				'$this->request->webroot'
			),
			array(
				'$this->base -> $this->request->base',
				'/(\$this->base\b(?!\())/',
				'$this->request->base'
			),
			array(
				'$this->here -> $this->request->here',
				'/(\$this->here\b(?!\())/',
				'$this->request->here'
			),
			array(
				'$this->action -> $this->request->action',
				'/(\$this->action\b(?!\())/',
				'$this->request->action'
			),
		);
		$this->_filesRegexpUpdate($patterns);
	}

/**
 * Update Configure::read() calls with no params.
 *
 * @return void
 */
	public function configure() {
		$this->_paths = array(
			APP
		);
		if (!empty($this->params['plugin'])) {
			$this->_paths = array(App::pluginPath($this->params['plugin']));
		}
		$patterns = array(
			array(
				"Configure::read() -> Configure::read('debug')",
				'/Configure::read\(\)/',
				'Configure::read(\'debug\')'
			),
		);
		$this->_filesRegexpUpdate($patterns);
	}

/**
 * Updates files based on regular expressions.
 *
 * @param array $patterns Array of search and replacement patterns.
 * @return void
 */
	protected function _filesRegexpUpdate($patterns) {
		$this->_findFiles($this->params['ext']);
		foreach ($this->_files as $file) {
			$this->out('Updating ' . $file . '...', 1, Shell::VERBOSE);
			$this->_updateFile($file, $patterns);
		}
	}

/**
 * Searches the paths and finds files based on extension.
 *
 * @param string $extensions
 * @return void
 */
	protected function _findFiles($extensions = '') {
		foreach ($this->_paths as $path) {
			if (!is_dir($path)) {
				continue;
			}
			$files = array();
			$Iterator = new RegexIterator(
				new RecursiveIteratorIterator(new RecursiveDirectoryIterator($path)),
				'/^.+\.(' . $extensions . ')$/i',
				RegexIterator::MATCH
			);
			foreach ($Iterator as $file) {
				if ($file->isFile()) {
					$files[] = $file->getPathname();
				}
			}
			$this->_files = array_merge($this->_files, $files);
		}
	}

/**
 * Update a single file.
 *
 * @param string $file The file to update
 * @param array $patterns The replacement patterns to run.
 * @return void
 */
	protected function _updateFile($file, $patterns) {
		$contents = file_get_contents($file);

		foreach ($patterns as $pattern) {
			$this->out(' * Updating ' . $pattern[0], 1, Shell::VERBOSE);
			$contents = preg_replace($pattern[1], $pattern[2], $contents);
		}

		$this->out('Done updating ' . $file, 1);
		if (!$this->params['dry-run']) {
			file_put_contents($file, $contents);
		}
	}

/**
 * get the option parser
 *
 * @return ConsoleOptionParser
 */
	function getOptionParser() {
		$subcommandParser = array(
			'options' => array(
				'plugin' => array(
					'short' => 'p',
					'help' => __('The plugin to update. Only the specified plugin will be updated.'
				)),
				'ext' => array(
					'short' => 'e',
					'help' => __('The extension(s) to search. A pipe delimited list, or a preg_match compatible subpattern'),
					'default' => 'php|ctp|thtml|inc|tpl'
				),
				'dry-run'=> array(
					'short' => 'd',
					'help' => __('Dry run the update, no files will actually be modified.'),
					'boolean' => true
				)
			)
		);

		return parent::getOptionParser()
			->description("A shell to help automate upgrading from CakePHP 1.3 to 2.0. \n" .
				"Be sure to have a backup of your application before running these commands.")
			->addSubcommand('all', array(
				'help' => 'Run all upgrade commands.',
				'parser' => $subcommandParser
			))
			->addSubcommand('i18n', array(
				'help' => 'Update the i18n translation method calls.',
				'parser' => $subcommandParser
			))
			->addSubcommand('helpers', array(
				'help' => 'Update calls to helpers.',
				'parser' => $subcommandParser
			))
			->addSubcommand('basics', array(
				'help' => 'Update removed basics functions to PHP native functions.',
				'parser' => $subcommandParser
			))
			->addSubcommand('request', array(
				'help' => 'Update removed request access, and replace with $this->request.',
				'parser' => $subcommandParser
			))
			->addSubcommand('configure', array(
				'help' => "Update Configure::read() to Configure::read('debug')",
				'parser' => $subcommandParser
			));
	}
}