<?php

class jQueryTmpl_Element_If extends jQueryTmpl_Element_TypeBlock implements jQueryTmpl_Element_TypeRenderable
{
    private $_firstToken;
    private $_elements;

    public function parseTokens(array $tokens)
    {
        // Remove first and last token
        $this->_firstToken = array_shift($tokens);
        $lastToken = array_pop($tokens);

        // Make sure we have the right types of tokens
        if (!($this->_firstToken instanceof jQueryTmpl_Token_IfStart && $lastToken instanceof jQueryTmpl_Token_IfEnd))
        {
            throw new jQueryTmpl_Element_Exception('Token mismatch, cannot create {{if}} element.');
        }

        $this->_elements = $this->_parser->parse($tokens);
    }

    public function render()
    {
        $options = $this->_firstToken->getOptions();

        $startDisplay = (bool)$this->_data->getValueOf($options['name']);

        $rendered = '';

        foreach($this->_elements as $element)
        {
            if ($element instanceof jQueryTmpl_Element_Else)
            {
                if ($startDisplay)
                {
                    break;
                }
                else
                {
                    $startDisplay = $element->setData($this->_data)->displayNextBlock();
                    continue;
                }
            }

            if ($startDisplay)
            {
                $rendered .= $element
                    ->setData($this->_data)
                    ->setCompiledTemplates($this->_compiledTemplates)
                    ->render();
            }
        }

        return $rendered;
    }
}