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<?php
/**
 * @package     Joomla.Administrator
 * @subpackage  com_fields
 *
 * @copyright   (C) 2017 Open Source Matters, Inc. <https://www.joomla.org>
 * @license     GNU General Public License version 2 or later; see LICENSE.txt
 */

namespace Joomla\Component\Fields\Administrator\Plugin;

\defined('_JEXEC') or die;

use Joomla\CMS\Filesystem\Folder;
use Joomla\CMS\Form\Form;
use Joomla\CMS\Language\Text;
use Joomla\CMS\Plugin\CMSPlugin;
use Joomla\CMS\Plugin\PluginHelper;
use Joomla\Component\Fields\Administrator\Helper\FieldsHelper;

/**
 * Abstract Fields Plugin
 *
 * @since  3.7.0
 */
abstract class FieldsPlugin extends CMSPlugin
{
	/**
	 * Affects constructor behavior. If true, language files will be loaded automatically.
	 *
	 * @var    boolean
	 * @since  3.7.0
	 */
	protected $autoloadLanguage = true;

/**
	 * Application object.
	 *
	 * @var    \Joomla\CMS\Application\CMSApplication
	 * @since  4.0.0
	 */
	protected $app;

/**
	 * Returns the custom fields types.
	 *
	 * @return  string[][]
	 *
	 * @since   3.7.0
	 */
	public function onCustomFieldsGetTypes()
	{
		// Cache filesystem access / checks
		static $types_cache = array();

if (isset($types_cache[$this->_type . $this->_name]))
		{
			return $types_cache[$this->_type . $this->_name];
		}

$types = array();

// The root of the plugin
		$root = JPATH_PLUGINS . '/' . $this->_type . '/' . $this->_name;

foreach (Folder::files($root . '/tmpl', '.php') as $layout)
		{
			// Strip the extension
			$layout = str_replace('.php', '', $layout);

// The data array
			$data = array();

// The language key
			$key = strtoupper($layout);

if ($key != strtoupper($this->_name))
			{
				$key = strtoupper($this->_name) . '_' . $layout;
			}

// Needed attributes
			$data['type'] = $layout;

if ($this->app->getLanguage()->hasKey('PLG_FIELDS_' . $key . '_LABEL'))
			{
				$data['label'] = Text::sprintf('PLG_FIELDS_' . $key . '_LABEL', strtolower($key));

// Fix wrongly set parentheses in RTL languages
				if ($this->app->getLanguage()->isRtl())
				{
					$data['label'] = $data['label'] . '‎';
				}
			}
			else
			{
				$data['label'] = $key;
			}

$path = $root . '/fields';

// Add the path when it exists
			if (file_exists($path))
			{
				$data['path'] = $path;
			}

$path = $root . '/rules';

// Add the path when it exists
			if (file_exists($path))
			{
				$data['rules'] = $path;
			}

$types[] = $data;
		}

// Add to cache and return the data
		$types_cache[$this->_type . $this->_name] = $types;

return $types;
	}

/**
	 * Prepares the field value.
	 *
	 * @param   string     $context  The context.
	 * @param   \stdclass  $item     The item.
	 * @param   \stdclass  $field    The field.
	 *
	 * @return  string
	 *
	 * @since   3.7.0
	 */
	public function onCustomFieldsPrepareField($context, $item, $field)
	{
		// Check if the field should be processed by us
		if (!$this->isTypeSupported($field->type))
		{
			return;
		}

// Merge the params from the plugin and field which has precedence
		$fieldParams = clone $this->params;
		$fieldParams->merge($field->fieldparams);

// Get the path for the layout file
		$path = PluginHelper::getLayoutPath('fields', $this->_name, $field->type);

if (!file_exists($path))
		{
			$path = PluginHelper::getLayoutPath('fields', $this->_name, $field->type);
		}

// Render the layout
		ob_start();
		include $path;
		$output = ob_get_clean();

// Return the output
		return $output;
	}

/**
	 * Transforms the field into a DOM XML element and appends it as a child on the given parent.
	 *
	 * @param   \stdClass    $field   The field.
	 * @param   \DOMElement  $parent  The field node parent.
	 * @param   Form         $form    The form.
	 *
	 * @return  \DOMElement
	 *
	 * @since   3.7.0
	 */
	public function onCustomFieldsPrepareDom($field, \DOMElement $parent, Form $form)
	{
		// Check if the field should be processed by us
		if (!$this->isTypeSupported($field->type))
		{
			return null;
		}

// Detect if the field is configured to be displayed on the form
		if (!FieldsHelper::displayFieldOnForm($field))
		{
			return null;
		}

// Create the node
		$node = $parent->appendChild(new \DOMElement('field'));

// Set the attributes
		$node->setAttribute('name', $field->name);
		$node->setAttribute('type', $field->type);
		$node->setAttribute('label', $field->label);
		$node->setAttribute('labelclass', $field->params->get('label_class'));
		$node->setAttribute('description', $field->description);
		$node->setAttribute('class', $field->params->get('class'));
		$node->setAttribute('hint', $field->params->get('hint'));
		$node->setAttribute('required', $field->required ? 'true' : 'false');

if ($field->default_value !== '')
		{
			$defaultNode = $node->appendChild(new \DOMElement('default'));
			$defaultNode->appendChild(new \DOMCdataSection($field->default_value));
		}

// Combine the two params
		$params = clone $this->params;
		$params->merge($field->fieldparams);

// Set the specific field parameters
		foreach ($params->toArray() as $key => $param)
		{
			if (is_array($param))
			{
				// Multidimensional arrays (eg. list options) can't be transformed properly
				$param = count($param) == count($param, COUNT_RECURSIVE) ? implode(',', $param) : '';
			}

if ($param === '' || (!is_string($param) && !is_numeric($param)))
			{
				continue;
			}

$node->setAttribute($key, $param);
		}

// Check if it is allowed to edit the field
		if (!FieldsHelper::canEditFieldValue($field))
		{
			$node->setAttribute('disabled', 'true');
		}

// Return the node
		return $node;
	}

/**
	 * The form event. Load additional parameters when available into the field form.
	 * Only when the type of the form is of interest.
	 *
	 * @param   Form       $form  The form
	 * @param   \stdClass  $data  The data
	 *
	 * @return  void
	 *
	 * @since   3.7.0
	 */
	public function onContentPrepareForm(Form $form, $data)
	{
		$path = $this->getFormPath($form, $data);

if ($path === null)
		{
			return;
		}

// Load the specific plugin parameters
		$form->load(file_get_contents($path), true, '/form/*');
	}

/**
	 * Returns the path of the XML definition file for the field parameters
	 *
	 * @param   Form      $form  The form
	 * @param   stdClass  $data  The data
	 *
	 * @return  string
	 *
	 * @since   4.0.0
	 */
	protected function getFormPath(Form $form, $data)
	{
		// Check if the field form is calling us
		if (strpos($form->getName(), 'com_fields.field') !== 0)
		{
			return null;
		}

// Ensure it is an object
		$formData = (object) $data;

// Gather the type
		$type = $form->getValue('type');

if (!empty($formData->type))
		{
			$type = $formData->type;
		}

// Not us
		if (!$this->isTypeSupported($type))
		{
			return null;
		}

$path = JPATH_PLUGINS . '/' . $this->_type . '/' . $this->_name . '/params/' . $type . '.xml';

// Check if params file exists
		if (!file_exists($path))
		{
			return null;
		}

return $path;
	}

/**
	 * Returns true if the given type is supported by the plugin.
	 *
	 * @param   string  $type  The type
	 *
	 * @return  boolean
	 *
	 * @since   3.7.0
	 */
	protected function isTypeSupported($type)
	{
		foreach ($this->onCustomFieldsGetTypes() as $typeSpecification)
		{
			if ($type == $typeSpecification['type'])
			{
				return true;
			}
		}

return false;
	}
}