<?php
/**
 * @package     FOF
 * @copyright   2010-2016 Nicholas K. Dionysopoulos / Akeeba Ltd
 * @license     GNU GPL version 2 or later
 */

namespace FOF30\Form\Field;

use FOF30\Form\FieldInterface;
use FOF30\Form\Form;
use FOF30\Model\DataModel;

defined('_JEXEC') or die;

\JFormHelper::loadFieldClass('user');

/**
 * Form Field class for the FOF framework
 * A user selection box / display field
 */
class User extends \JFormFieldUser implements FieldInterface
{
	/**
	 * @var  string  Static field output
	 */
	protected $static;

	/**
	 * @var  string  Repeatable field output
	 */
	protected $repeatable;

	/**
	 * The Form object of the form attached to the form field.
	 *
	 * @var    Form
	 */
	protected $form;

	/**
	 * A monotonically increasing number, denoting the row number in a repeatable view
	 *
	 * @var  int
	 */
	public $rowid;

	/**
	 * The item being rendered in a repeatable form field
	 *
	 * @var  DataModel
	 */
	public $item;

	/**
	 * Method to get certain otherwise inaccessible properties from the form field object.
	 *
	 * @param   string  $name  The property name for which to the the value.
	 *
	 * @return  mixed  The property value or null.
	 *
	 * @since   2.0
	 */
	public function __get($name)
	{
		switch ($name)
		{
			case 'static':
				if (empty($this->static))
				{
					$this->static = $this->getStatic();
				}

				return $this->static;
				break;

			case 'repeatable':
				if (empty($this->repeatable))
				{
					$this->repeatable = $this->getRepeatable();
				}

				return $this->repeatable;
				break;

			default:
				return parent::__get($name);
		}
	}

	/**
	 * Get the rendering of this field type for static display, e.g. in a single
	 * item view (typically a "read" task).
	 *
	 * @since 2.0
	 *
	 * @return  string  The field HTML
	 */
	public function getStatic()
	{
		if (isset($this->element['legacy']))
		{
			return $this->getInput();
		}

		// Initialise
		$show_username = !$this->element['show_username'] == 'false';
		$show_email    = $this->element['show_email'] == 'true';
		$show_name     = $this->element['show_name'] == 'true';
		$show_id       = $this->element['show_id'] == 'true';
		$class         = $this->class ? ' class="' . $this->class . '"' : '';

		// Get the user record
		$user = $this->form->getContainer()->platform->getUser($this->value);

		// Render the HTML
		$html = '<div id="' . $this->id . '" ' . $class . '>';

		if ($show_username)
		{
			$html .= '<span class="fof-userfield-username">' . $user->username . '</span>';
		}

		if ($show_id)
		{
			$html .= '<span class="fof-userfield-id">' . $user->id . '</span>';
		}

		if ($show_name)
		{
			$html .= '<span class="fof-userfield-name">' . $user->name . '</span>';
		}

		if ($show_email)
		{
			$html .= '<span class="fof-userfield-email">' . $user->email . '</span>';
		}

		$html .= '</div>';

		return $html;
	}

	/**
	 * Get the rendering of this field type for a repeatable (grid) display,
	 * e.g. in a view listing many item (typically a "browse" task)
	 *
	 * @since 2.0
	 *
	 * @return  string  The field HTML
	 */
	public function getRepeatable()
	{
		static $userCache = array();

		if (isset($this->element['legacy']))
		{
			return $this->getInput();
		}

		// Initialise
		$show_username = !$this->element['show_username'] == 'false';
		$show_email    = !$this->element['show_email'] == 'false';
		$show_name     = !$this->element['show_name'] == 'false';
		$show_id       = !$this->element['show_id'] == 'false';
		$show_avatar   = !$this->element['show_avatar'] == 'false';
		$show_link     = $this->element['show_link'] == 'true';
		$link_url      = $this->element['link_url'] ? $this->element['link_url'] : null;
		$avatar_method = 'gravatar';
		$avatar_size   = $this->element['avatar_size'] ? $this->element['avatar_size'] : 64;
		$class         = '';

		// Get the user record
		$key = is_numeric($this->value) ? $this->value : 'empty';
		$key = ($key == 0) ? 'zero' : $key;

		if (!array_key_exists($key, $userCache))
		{
			$userCache[$key] = $this->form->getContainer()->platform->getUser($this->value);
		}

		$user = $userCache[$key];

		// Get the field parameters
		if ($this->class)
		{
			$class = ' class="' . $this->class . '"';
		}

		if ($this->element['avatar_method'])
		{
			$avatar_method = strtolower($this->element['avatar_method']);
		}

		if (!$link_url && $this->form->getContainer()->platform->isBackend())
		{
			$link_url = 'index.php?option=com_users&task=user.edit&id=[USER:ID]';
		}
		elseif (!$link_url)
		{
			// If no link is defined in the front-end, we can't create a
			// default link. Therefore, show no link.
			$show_link = false;
		}

		// Post-process the link URL
		if ($show_link)
		{
			$replacements = array(
				'[USER:ID]'			 => $user->id,
				'[USER:USERNAME]'	 => $user->username,
				'[USER:EMAIL]'		 => $user->email,
				'[USER:NAME]'		 => $user->name,
			);

			foreach ($replacements as $key => $value)
			{
				$link_url = str_replace($key, $value, $link_url);
			}

			$link_url = $this->parseFieldTags($link_url);
		}

		// Get the avatar image, if necessary
		$avatar_url = '';

		if ($show_avatar)
		{
			if ($avatar_method == 'plugin')
			{
				// Use the user plugins to get an avatar
				$this->form->getContainer()->platform->importPlugin('user');
				$jResponse = $this->form->getContainer()->platform->runPlugins('onUserAvatar', array($user, $avatar_size));

				if (!empty($jResponse))
				{
					foreach ($jResponse as $response)
					{
						if ($response)
						{
							$avatar_url = $response;
						}
					}
				}

				if (empty($avatar_url))
				{
					$show_avatar = false;
				}
			}
			else
			{
				// Fall back to the Gravatar method
				$md5 = md5($user->email);

				if ($this->form->getContainer()->platform->isCli())
				{
					$scheme = 'http';
				}
				else
				{
					$scheme = \JUri::getInstance()->getScheme();
				}

				if ($scheme == 'http')
				{
					$avatar_url = 'http://www.gravatar.com/avatar/' . $md5 . '.jpg?s='
						. $avatar_size . '&d=mm';
				}
				else
				{
					$avatar_url = 'https://secure.gravatar.com/avatar/' . $md5 . '.jpg?s='
						. $avatar_size . '&d=mm';
				}
			}
		}

		// Generate the HTML
		$html = '<div id="' . $this->id . '" ' . $class . '>';

		if ($show_avatar)
		{
			$html .= '<img src="' . $avatar_url . '" align="left" class="fof-usersfield-avatar" />';
		}

		if ($show_link)
		{
			$html .= '<a href="' . $link_url . '">';
		}

		if ($show_username)
		{
			$html .= '<span class="fof-usersfield-username">' . $user->username
				. '</span>';
		}

		if ($show_id)
		{
			$html .= '<span class="fof-usersfield-id">' . $user->id
				. '</span>';
		}

		if ($show_name)
		{
			$html .= '<span class="fof-usersfield-name">' . $user->name
				. '</span>';
		}

		if ($show_email)
		{
			$html .= '<span class="fof-usersfield-email">' . $user->email
				. '</span>';
		}

		if ($show_link)
		{
			$html .= '</a>';
		}

		$html .= '</div>';

		return $html;
	}

	/**
	 * Replace string with tags that reference fields
	 *
	 * @param   string  $text  Text to process
	 *
	 * @return  string         Text with tags replace
	 */
    protected function parseFieldTags($text)
    {
        $ret = $text;

        // Replace [ITEM:ID] in the URL with the item's key value (usually:
        // the auto-incrementing numeric ID)
        if (is_null($this->item))
        {
            $this->item = $this->form->getModel();
        }

        $replace  = $this->item->getId();
        $ret = str_replace('[ITEM:ID]', $replace, $ret);

        // Replace the [ITEMID] in the URL with the current Itemid parameter
        $ret = str_replace('[ITEMID]', $this->form->getContainer()->input->getInt('Itemid', 0), $ret);

        // Replace the [TOKEN] in the URL with the Joomla! form token
        $ret = str_replace('[TOKEN]', \JFactory::getSession()->getFormToken(), $ret);

        // Replace other field variables in the URL
        $data = $this->item->getData();

        foreach ($data as $field => $value)
        {
            // Skip non-processable values
            if(is_array($value) || is_object($value))
            {
                continue;
            }

            $search = '[ITEM:' . strtoupper($field) . ']';
            $ret    = str_replace($search, $value, $ret);
        }

        return $ret;
    }
}
