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<?php

/**

 * CakePHP :  Rapid Development Framework (http://cakephp.org)

 * Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)

 *

 * Licensed under The MIT License

 * For full copyright and license information, please see the LICENSE.txt

 * Redistributions of files must retain the above copyright notice.

 *

 * @copyright     Copyright (c) Cake Software Foundation, Inc. (http://cakefoundation.org)

 * @link          http://cakephp.org CakePHP(tm) Project

 * @package       Cake.View.Helper

 * @since         CakePHP(tm) v 2.0

 * @license       http://www.opensource.org/licenses/mit-license.php MIT License

 */

App::uses('AppHelper', 'View/Helper');

/**

 * JsEngineBaseClass

 *

 * Abstract Base Class for All JsEngines to extend. Provides generic methods.

 *

 * @package       Cake.View.Helper

 */

abstract class JsBaseEngineHelper extends AppHelper {

/**

 * The js snippet for the current selection.

 *

 * @var string

 */

	public $selection;

/**

 * Collection of option maps. Option maps allow other helpers to use generic names for engine

 * callbacks and options. Allowing uniform code access for all engine types. Their use is optional

 * for end user use though.

 *

 * @var array

 */

	protected $_optionMap = array();

/**

 * An array of lowercase method names in the Engine that are buffered unless otherwise disabled.

 * This allows specific 'end point' methods to be automatically buffered by the JsHelper.

 *

 * @var array

 */

	public $bufferedMethods = array('event', 'sortable', 'drag', 'drop', 'slider');

/**

 * Contains a list of callback names -> default arguments.

 *

 * @var array

 */

	protected $_callbackArguments = array();

/**

 * Create an `alert()` message in JavaScript

 *

 * @param string $message Message you want to alter.

 * @return string completed alert()

 */

	public function alert($message) {

		return 'alert("' . $this->escape($message) . '");';

	}

/**

 * Redirects to a URL. Creates a window.location modification snippet

 * that can be used to trigger 'redirects' from JavaScript.

 *

 * @param string|array $url URL

 * @return string completed redirect in javascript

 */

	public function redirect($url = null) {

		return 'window.location = "' . Router::url($url) . '";';

	}

/**

 * Create a `confirm()` message

 *

 * @param string $message Message you want confirmed.

 * @return string completed confirm()

 */

	public function confirm($message) {

		return 'confirm("' . $this->escape($message) . '");';

	}

/**

 * Generate a confirm snippet that returns false from the current

 * function scope.

 *

 * @param string $message Message to use in the confirm dialog.

 * @return string completed confirm with return script

 */

	public function confirmReturn($message) {

		$out = 'var _confirm = ' . $this->confirm($message);

		$out .= "if (!_confirm) {\n\treturn false;\n}";

		return $out;

	}

/**

 * Create a `prompt()` JavaScript function

 *

 * @param string $message Message you want to prompt.

 * @param string $default Default message

 * @return string completed prompt()

 */

	public function prompt($message, $default = '') {

		return 'prompt("' . $this->escape($message) . '", "' . $this->escape($default) . '");';

	}

/**

 * Generates a JavaScript object in JavaScript Object Notation (JSON)

 * from an array. Will use native JSON encode method if available, and $useNative == true

 *

 * ### Options:

 *

 * - `prefix` - String prepended to the returned data.

 * - `postfix` - String appended to the returned data.

 *

 * @param array $data Data to be converted.

 * @param array $options Set of options, see above.

 * @return string A JSON code block

 */

	public function object($data = array(), $options = array()) {

		$defaultOptions = array(

			'prefix' => '', 'postfix' => '',

		);

		$options += $defaultOptions;

		return $options['prefix'] . json_encode($data) . $options['postfix'];

	}

/**

 * Converts a PHP-native variable of any type to a JSON-equivalent representation

 *

 * @param mixed $val A PHP variable to be converted to JSON

 * @param bool $quoteString If false, leaves string values unquoted

 * @param string $key Key name.

 * @return string a JavaScript-safe/JSON representation of $val

 */

	public function value($val = array(), $quoteString = null, $key = 'value') {

		if ($quoteString === null) {

			$quoteString = true;

		}

		switch (true) {

			case (is_array($val) || is_object($val)):

				$val = $this->object($val);

				break;

			case ($val === null):

				$val = 'null';

				break;

			case (is_bool($val)):

				$val = ($val === true) ? 'true' : 'false';

				break;

			case (is_int($val)):

				$val = $val;

				break;

			case (is_float($val)):

				$val = sprintf("%.11f", $val);

				break;

			default:

				$val = $this->escape($val);

				if ($quoteString) {

					$val = '"' . $val . '"';

				}

		}

		return $val;

	}

/**

 * Escape a string to be JSON friendly.

 *

 * List of escaped elements:

 *

 * - "\r" => '\n'

 * - "\n" => '\n'

 * - '"' => '\"'

 *

 * @param string $string String that needs to get escaped.

 * @return string Escaped string.

 */

	public function escape($string) {

		return $this->_utf8ToHex($string);

	}

/**

 * Encode a string into JSON. Converts and escapes necessary characters.

 *

 * @param string $string The string that needs to be utf8->hex encoded

 * @return void

 */

	protected function _utf8ToHex($string) {

		$length = strlen($string);

		$return = '';

		for ($i = 0; $i < $length; ++$i) {

			$ord = ord($string{$i});

			switch (true) {

				case $ord == 0x08:

					$return .= '\b';

					break;

				case $ord == 0x09:

					$return .= '\t';

					break;

				case $ord == 0x0A:

					$return .= '\n';

					break;

				case $ord == 0x0C:

					$return .= '\f';

					break;

				case $ord == 0x0D:

					$return .= '\r';

					break;

				case $ord == 0x22:

				case $ord == 0x2F:

				case $ord == 0x5C:

					$return .= '\\' . $string{$i};

					break;

				case (($ord >= 0x20) && ($ord <= 0x7F)):

					$return .= $string{$i};

					break;

				case (($ord & 0xE0) == 0xC0):

					if ($i + 1 >= $length) {

						$i += 1;

						$return .= '?';

						break;

					}

					$charbits = $string{$i} . $string{$i + 1};

					$char = Multibyte::utf8($charbits);

					$return .= sprintf('\u%04s', dechex($char[0]));

					$i += 1;

					break;

				case (($ord & 0xF0) == 0xE0):

					if ($i + 2 >= $length) {

						$i += 2;

						$return .= '?';

						break;

					}

					$charbits = $string{$i} . $string{$i + 1} . $string{$i + 2};

					$char = Multibyte::utf8($charbits);

					$return .= sprintf('\u%04s', dechex($char[0]));

					$i += 2;

					break;

				case (($ord & 0xF8) == 0xF0):

					if ($i + 3 >= $length) {

						$i += 3;

						$return .= '?';

						break;

					}

					$charbits = $string{$i} . $string{$i + 1} . $string{$i + 2} . $string{$i + 3};

					$char = Multibyte::utf8($charbits);

					$return .= sprintf('\u%04s', dechex($char[0]));

					$i += 3;

					break;

				case (($ord & 0xFC) == 0xF8):

					if ($i + 4 >= $length) {

						$i += 4;

						$return .= '?';

						break;

					}

					$charbits = $string{$i} . $string{$i + 1} . $string{$i + 2} . $string{$i + 3} . $string{$i + 4};

					$char = Multibyte::utf8($charbits);

					$return .= sprintf('\u%04s', dechex($char[0]));

					$i += 4;

					break;

				case (($ord & 0xFE) == 0xFC):

					if ($i + 5 >= $length) {

						$i += 5;

						$return .= '?';

						break;

					}

					$charbits = $string{$i} . $string{$i + 1} . $string{$i + 2} . $string{$i + 3} . $string{$i + 4} . $string{$i + 5};

					$char = Multibyte::utf8($charbits);

					$return .= sprintf('\u%04s', dechex($char[0]));

					$i += 5;

					break;

			}

		}

		return $return;

	}

/**

 * Create javascript selector for a CSS rule

 *

 * @param string $selector The selector that is targeted

 * @return JsBaseEngineHelper instance of $this. Allows chained methods.

 */

	abstract public function get($selector);

/**

 * Add an event to the script cache. Operates on the currently selected elements.

 *

 * ### Options

 *

 * - `wrap` - Whether you want the callback wrapped in an anonymous function. (defaults to true)

 * - `stop` - Whether you want the event to stopped. (defaults to true)

 *

 * @param string $type Type of event to bind to the current dom id

 * @param string $callback The JavaScript function you wish to trigger or the function literal

 * @param array $options Options for the event.

 * @return string completed event handler

 */

	abstract public function event($type, $callback, $options = array());

/**

 * Create a domReady event. This is a special event in many libraries

 *

 * @param string $functionBody The code to run on domReady

 * @return string completed domReady method

 */

	abstract public function domReady($functionBody);

/**

 * Create an iteration over the current selection result.

 *

 * @param string $callback The function body you wish to apply during the iteration.

 * @return string completed iteration

 */

	abstract public function each($callback);

/**

 * Trigger an Effect.

 *

 * ### Supported Effects

 *

 * The following effects are supported by all core JsEngines

 *

 * - `show` - reveal an element.

 * - `hide` - hide an element.

 * - `fadeIn` - Fade in an element.

 * - `fadeOut` - Fade out an element.

 * - `slideIn` - Slide an element in.

 * - `slideOut` - Slide an element out.

 *

 * ### Options

 *

 * - `speed` - Speed at which the animation should occur. Accepted values are 'slow', 'fast'. Not all effects use

 *   the speed option.

 *

 * @param string $name The name of the effect to trigger.

 * @param array $options Array of options for the effect.

 * @return string completed string with effect.

 */

	abstract public function effect($name, $options = array());

/**

 * Make an XHR request

 *

 * ### Event Options

 *

 * - `complete` - Callback to fire on complete.

 * - `success` - Callback to fire on success.

 * - `before` - Callback to fire on request initialization.

 * - `error` - Callback to fire on request failure.

 *

 * ### Options

 *

 * - `method` - The method to make the request with defaults to GET in more libraries

 * - `async` - Whether or not you want an asynchronous request.

 * - `data` - Additional data to send.

 * - `update` - Dom id to update with the content of the request.

 * - `type` - Data type for response. 'json' and 'html' are supported. Default is html for most libraries.

 * - `evalScripts` - Whether or not <script> tags should be eval'ed.

 * - `dataExpression` - Should the `data` key be treated as a callback. Useful for supplying `$options['data']` as

 *    another JavaScript expression.

 *

 * @param string|array $url Array or String URL to target with the request.

 * @param array $options Array of options. See above for cross library supported options

 * @return string XHR request.

 */

	abstract public function request($url, $options = array());

/**

 * Create a draggable element. Works on the currently selected element.

 * Additional options may be supported by the library implementation.

 *

 * ### Options

 *

 * - `handle` - selector to the handle element.

 * - `snapGrid` - The pixel grid that movement snaps to, an array(x, y)

 * - `container` - The element that acts as a bounding box for the draggable element.

 *

 * ### Event Options

 *

 * - `start` - Event fired when the drag starts

 * - `drag` - Event fired on every step of the drag

 * - `stop` - Event fired when dragging stops (mouse release)

 *

 * @param array $options Options array see above.

 * @return string Completed drag script

 */

	abstract public function drag($options = array());

/**

 * Create a droppable element. Allows for draggable elements to be dropped on it.

 * Additional options may be supported by the library implementation.

 *

 * ### Options

 *

 * - `accept` - Selector for elements this droppable will accept.

 * - `hoverclass` - Class to add to droppable when a draggable is over.

 *

 * ### Event Options

 *

 * - `drop` - Event fired when an element is dropped into the drop zone.

 * - `hover` - Event fired when a drag enters a drop zone.

 * - `leave` - Event fired when a drag is removed from a drop zone without being dropped.

 *

 * @param array $options Array of options for the drop. See above.

 * @return string Completed drop script

 */

	abstract public function drop($options = array());

/**

 * Create a sortable element.

 * Additional options may be supported by the library implementation.

 *

 * ### Options

 *

 * - `containment` - Container for move action

 * - `handle` - Selector to handle element. Only this element will start sort action.

 * - `revert` - Whether or not to use an effect to move sortable into final position.

 * - `opacity` - Opacity of the placeholder

 * - `distance` - Distance a sortable must be dragged before sorting starts.

 *

 * ### Event Options

 *

 * - `start` - Event fired when sorting starts

 * - `sort` - Event fired during sorting

 * - `complete` - Event fired when sorting completes.

 *

 * @param array $options Array of options for the sortable. See above.

 * @return string Completed sortable script.

 */

	abstract public function sortable($options = array());

/**

 * Create a slider UI widget. Comprised of a track and knob.

 * Additional options may be supported by the library implementation.

 *

 * ### Options

 *

 * - `handle` - The id of the element used in sliding.

 * - `direction` - The direction of the slider either 'vertical' or 'horizontal'

 * - `min` - The min value for the slider.

 * - `max` - The max value for the slider.

 * - `step` - The number of steps or ticks the slider will have.

 * - `value` - The initial offset of the slider.

 *

 * ### Events

 *

 * - `change` - Fired when the slider's value is updated

 * - `complete` - Fired when the user stops sliding the handle

 *

 * @param array $options Array of options for the slider. See above.

 * @return string Completed slider script

 */

	abstract public function slider($options = array());

/**

 * Serialize the form attached to $selector.

 * Pass `true` for $isForm if the current selection is a form element.

 * Converts the form or the form element attached to the current selection into a string/json object

 * (depending on the library implementation) for use with XHR operations.

 *

 * ### Options

 *

 * - `isForm` - is the current selection a form, or an input? (defaults to false)

 * - `inline` - is the rendered statement going to be used inside another JS statement? (defaults to false)

 *

 * @param array $options options for serialization generation.

 * @return string completed form serialization script

 */

	abstract public function serializeForm($options = array());

/**

 * Parse an options assoc array into a JavaScript object literal.

 * Similar to object() but treats any non-integer value as a string,

 * does not include `{ }`

 *

 * @param array $options Options to be converted

 * @param array $safeKeys Keys that should not be escaped.

 * @return string Parsed JSON options without enclosing { }.

 */

	protected function _parseOptions($options, $safeKeys = array()) {

		$out = array();

		$safeKeys = array_flip($safeKeys);

		foreach ($options as $key => $value) {

			if (!is_int($value) && !isset($safeKeys[$key])) {

				$value = $this->value($value);

			}

			$out[] = $key . ':' . $value;

		}

		sort($out);

		return implode(', ', $out);

	}

/**

 * Maps Abstract options to engine specific option names.

 * If attributes are missing from the map, they are not changed.

 *

 * @param string $method Name of method whose options are being worked with.

 * @param array $options Array of options to map.

 * @return array Array of mapped options.

 */

	protected function _mapOptions($method, $options) {

		if (!isset($this->_optionMap[$method])) {

			return $options;

		}

		foreach ($this->_optionMap[$method] as $abstract => $concrete) {

			if (isset($options[$abstract])) {

				$options[$concrete] = $options[$abstract];

				unset($options[$abstract]);

			}

		}

		return $options;

	}

/**

 * Prepare callbacks and wrap them with function ([args]) { } as defined in

 * _callbackArgs array.

 *

 * @param string $method Name of the method you are preparing callbacks for.

 * @param array $options Array of options being parsed

 * @param array $callbacks Additional Keys that contain callbacks

 * @return array Array of options with callbacks added.

 */

	protected function _prepareCallbacks($method, $options, $callbacks = array()) {

		$wrapCallbacks = true;

		if (isset($options['wrapCallbacks'])) {

			$wrapCallbacks = $options['wrapCallbacks'];

		}

		unset($options['wrapCallbacks']);

		if (!$wrapCallbacks) {

			return $options;

		}

		$callbackOptions = array();

		if (isset($this->_callbackArguments[$method])) {

			$callbackOptions = $this->_callbackArguments[$method];

		}

		$callbacks = array_unique(array_merge(array_keys($callbackOptions), (array)$callbacks));

		foreach ($callbacks as $callback) {

			if (empty($options[$callback])) {

				continue;

			}

			$args = null;

			if (!empty($callbackOptions[$callback])) {

				$args = $callbackOptions[$callback];

			}

			$options[$callback] = 'function (' . $args . ') {' . $options[$callback] . '}';

		}

		return $options;

	}

/**

 * Convenience wrapper method for all common option processing steps.

 * Runs _mapOptions, _prepareCallbacks, and _parseOptions in order.

 *

 * @param string $method Name of method processing options for.

 * @param array $options Array of options to process.

 * @return string Parsed options string.

 */

	protected function _processOptions($method, $options) {

		$options = $this->_mapOptions($method, $options);

		$options = $this->_prepareCallbacks($method, $options);

		$options = $this->_parseOptions($options, array_keys($this->_callbackArguments[$method]));

		return $options;

	}

/**

 * Convert an array of data into a query string

 *

 * @param array $parameters Array of parameters to convert to a query string

 * @return string Querystring fragment

 */

	protected function _toQuerystring($parameters) {

		$out = '';

		$keys = array_keys($parameters);

		$count = count($parameters);

		for ($i = 0; $i < $count; $i++) {

			$out .= $keys[$i] . '=' . $parameters[$keys[$i]];

			if ($i < $count - 1) {

				$out .= '&';

			}

		}

		return $out;

	}

}