<?php

/**
 * Contao Open Source CMS
 *
 * Copyright (c) 2005-2016 Leo Feyer
 *
 * @license LGPL-3.0+
 */

namespace Contao;


/**
 * Class FormCheckBox
 *
 * @property array $options
 *
 * @author Leo Feyer <https://github.com/leofeyer>
 */
class FormCheckBox extends \Widget
{

	/**
	 * Submit user input
	 *
	 * @var boolean
	 */
	protected $blnSubmitInput = true;

	/**
	 * Template
	 *
	 * @var string
	 */
	protected $strTemplate = 'form_checkbox';

	/**
	 * Error message
	 *
	 * @var string
	 */
	protected $strError = '';

	/**
	 * The CSS class prefix
	 *
	 * @var string
	 */
	protected $strPrefix = 'widget widget-checkbox';


	/**
	 * Add specific attributes
	 *
	 * @param string $strKey   The attribute name
	 * @param mixed  $varValue The attribute value
	 */
	public function __set($strKey, $varValue)
	{
		switch ($strKey)
		{
			case 'options':
				$this->arrOptions = deserialize($varValue);
				break;

			case 'rgxp':
			case 'minlength':
			case 'maxlength':
				// Ignore
				break;

			default:
				parent::__set($strKey, $varValue);
				break;
		}
	}


	/**
	 * Return a parameter
	 *
	 * @param string $strKey The parameter key
	 *
	 * @return mixed The parameter value
	 */
	public function __get($strKey)
	{
		if ($strKey == 'options')
		{
			return $this->arrOptions;
		}

		return parent::__get($strKey);
	}


	/**
	 * Check the options if the field is mandatory
	 */
	public function validate()
	{
		$mandatory = $this->mandatory;
		$options = $this->getPost($this->strName);

		// Check if there is at least one value
		if ($mandatory && is_array($options))
		{
			foreach ($options as $option)
			{
				if (strlen($option))
				{
					$this->mandatory = false;
					break;
				}
			}
		}

		$varInput = $this->validator($options);

		// Check for a valid option (see #4383)
		if (!empty($varInput) && !$this->isValidOption($varInput))
		{
			$this->addError($GLOBALS['TL_LANG']['ERR']['invalid']);
		}

		// Add class "error"
		if ($this->hasErrors())
		{
			$this->class = 'error';
		}
		else
		{
			$this->varValue = $varInput;
		}

		// Reset the property
		if ($mandatory)
		{
			$this->mandatory = true;
		}

		// Clear result if nothing has been submitted
		if (!isset($_POST[$this->strName]))
		{
			$this->varValue = '';
		}
	}


	/**
	 * Return all attributes as string
	 *
	 * @param array $arrStrip An optional array with attributes to strip
	 *
	 * @return string The attributes string
	 */
	public function getAttributes($arrStrip=array())
	{
		// The "required" attribute only makes sense for single checkboxes
		if (count($this->arrOptions) == 1 && $this->mandatory)
		{
			$this->arrAttributes['required'] = 'required';
		}

		return parent::getAttributes($arrStrip);
	}


	/**
	 * Generate the options
	 *
	 * @return array The options array
	 */
	protected function getOptions()
	{
		$arrOptions = array();
		$blnHasGroups = false;

		foreach ($this->arrOptions as $i=>$arrOption)
		{
			if ($arrOption['group'])
			{
				if ($blnHasGroups)
				{
					$arrOptions[] = array
					(
						'type' => 'group_end'
					);
				}

				$arrOptions[] = array
				(
					'type'  => 'group_start',
					'label' => specialchars($arrOption['label'])
				);

				$blnHasGroups = true;
			}
			else
			{
				$arrOptions[] = array
				(
					'type'       => 'option',
					'name'       => $this->strName . ((count($this->arrOptions) > 1) ? '[]' : ''),
					'id'         => $this->strId . '_' . $i,
					'value'      => $arrOption['value'],
					'checked'    => $this->isChecked($arrOption),
					'attributes' => $this->getAttributes(),
					'label'      => $arrOption['label']
				);
			}
		}

		if ($blnHasGroups)
		{
			$arrOptions[] = array
			(
				'type' => 'group_end'
			);
		}

		return $arrOptions;
	}


	/**
	 * Override the parent method and inject the error message inside the fieldset (see #3392)
	 *
	 * @param boolean $blnSwitchOrder If true, the error message will be shown below the field
	 *
	 * @return string The form field markup
	 */
	public function generateWithError($blnSwitchOrder=false)
	{
		$this->strError = $this->getErrorAsHTML();

		return $this->generate();
	}


	/**
	 * Generate the widget and return it as string
	 *
	 * @return string The widget markup
	 */
	public function generate()
	{
		$strOptions = '';

		foreach ($this->arrOptions as $i=>$arrOption)
		{
			$strOptions .= sprintf('<span><input type="checkbox" name="%s" id="opt_%s" class="checkbox" value="%s"%s%s%s <label id="lbl_%s" for="opt_%s">%s</label></span> ',
									$this->strName . ((count($this->arrOptions) > 1) ? '[]' : ''),
									$this->strId.'_'.$i,
									$arrOption['value'],
									$this->isChecked($arrOption),
									$this->getAttributes(),
									$this->strTagEnding,
									$this->strId.'_'.$i,
									$this->strId.'_'.$i,
									$arrOption['label']);
		}

		if ($this->strLabel != '')
		{
			return sprintf('<fieldset id="ctrl_%s" class="checkbox_container%s"><legend>%s%s%s</legend>%s<input type="hidden" name="%s" value=""%s%s</fieldset>',
							$this->strId,
							(($this->strClass != '') ? ' ' . $this->strClass : ''),
							($this->mandatory ? '<span class="invisible">'.$GLOBALS['TL_LANG']['MSC']['mandatory'].' </span>' : ''),
							$this->strLabel,
							($this->mandatory ? '<span class="mandatory">*</span>' : ''),
							$this->strError,
							$this->strName,
							$this->strTagEnding,
							$strOptions) . $this->addSubmit();
		}
		else
		{
			return sprintf('<fieldset id="ctrl_%s" class="checkbox_container%s">%s<input type="hidden" name="%s" value=""%s%s</fieldset>',
							$this->strId,
							(($this->strClass != '') ? ' ' . $this->strClass : ''),
							$this->strError,
							$this->strName,
							$this->strTagEnding,
							$strOptions) . $this->addSubmit();
		}
	}
}
