<?
class template
{
	var $page_title;
	var $message;
	var $redirect_url;

	function template ($page_title = 'Music Videos for you!')
	{
		// set the page title
		$this->page_title = $page_title;
	}

	function pull_template ($template, $output = 0)
	{
		// we need this to be global for the links
		global $user;

		// check for admin template
		$template = $this->check_admin($template);

		// check if template exists
		$this->check_template ($template, 1);

		// call the template and store the contents in a variable
		ob_start();
			include (TEMPLATE_DIR.$template.'.php');
			$template_output = ob_get_contents();
		ob_end_clean();

		// determine whether or not to output the template that is called
		if ($output == 1)
		{
			echo $this->replace_variables ($template_output, '{', '}');
			return true;
		}
		else 
		{
			return $this->replace_variables ($template_output, '{', '}');
		}
	}

	function output_page ($template)
	{
		// determine which type of page it is
		if ($template == 'redirect')
		{
			$this->pull_template('redirect', 1);
			exit;
		}
		else if ($template == 'error')
		{
			$this->pull_template('error', 1);
			exit;
		}
		else
		{
			// check to see if template exists first
			$template = $this->check_template($template);

			$this->pull_template('header', 1);
			$this->pull_template($template, 1);
			$this->pull_template('footer', 1);
			exit;
		}
	}

	function check_template ($template, $output_page = 0)
	{
		// check for admin template
		$template = $this->check_admin($template);

		if (!file_exists(TEMPLATE_DIR.$template.'.php'))
		{
			global $title;
			$title = "Template '" . TEMPLATE_DIR.$template.".php" . "' could not be found.";
			if ($output_page == 1)
			{
				$this->output_page (ERROR_DIR.'template');
				exit;
			}
			else
			{
				return ERROR_DIR.'template';
			}
		}
		else
		{
			return $template;
		}
	}

	function check_admin ($template)
	{
		// check if it's an admin page
		if (substr($template, 0, strlen(ADMIN_PREFIX)) == ADMIN_PREFIX)
		{
			$template = ADMIN_DIR . $template;
		}

		return $template;
	}

	function replace_variables ($text, $start, $end)
	{
		foreach (split("\n", $text) as $line_num => $line)
		{
			$current = $line;
			do
			{
				// check for variable on this line
				if (eregi($start, $current) && eregi($end, $current))
				{
					$startpos = strpos ($current, $start);
					$endpos = strpos ($current, $end);
					if ($startpos < $endpos)
					{
						$var = substr($current, $startpos+strlen($start), $endpos-$startpos-strlen($start));
						$array_var = $this->array_variable ($var);
						if (count($array_var) != 0)
						{
							$replace['name'] = $array_var['name'];
							$replace['value'] = $array_var['value'];
						}
						else
						{
							global $$var;
							$replace['name'] = $var;
							$replace['value'] = $$var;
						}
						$name[] = $replace['name'];
						$content[] = strval($replace['value']);
						$current = substr($current, $endpos+strlen($end));
					}
					else
					{
						$current = substr($current, $startpos+strlen($start));
					}
				}
				else
				{
					$current = '';
				}
			} while (strlen($current) > 0);

 for ($x = 0; $x < count($name); ++$x)
{
		$line = str_replace ($start . $name[$x] . $end, $content[$x], $line);
		}
			$new[] = $line;
			unset($name, $content);
		}
		return implode ("\n", $new);
}

	function array_variable ($var)
	{
		// check for array bracket
		if (eregi("\[", $var) && eregi("\]", $var))
		{
			$startpos = strpos ($var, "[");
			$endpos = strpos ($var, "]");
			$key = substr ($var, $startpos+1, $endpos-$startpos-1);
			$array_name = substr($var, 0, $startpos);
			global $$array_name;
 			$replacement['value'] = ${$array_name}[$key];
			$replacement['name'] = $array_name."[".$key."]";
		}
		return $replacement;
	}

	function no_permission ()
	{
		if (empty($_SERVER['HTTP_REFERER'])) $ref = 'search.php';
		else $ref = $_SERVER['HTTP_REFERER'];
		$this->page_title = 'No Permission';
		$this->redirect_message = 'You do not have permission to access this page.';
		$this->redirect_url = $ref;
		$this->output_page ('redirect');
		exit;
	}

}
?>