<?php
/**
 * Whoops - php errors for cool kids
 * @author Filipe Dobreira <http://github.com/filp>
 */

namespace Whoops\Handler;
use Whoops\Handler\Handler;
use InvalidArgumentException;

class PrettyPageHandler extends Handler
{
    /**
     * @var string
     */
    private $resourcesPath;

    /**
     * @var array[]
     */
    private $extraTables = array();

    /**
     * @var string
     */
    private $pageTitle = 'Whoops! There was an error.';

    /**
     * @return int|null
     */
    public function handle()
    {
        // Check conditions for outputting HTML:
        // @todo: make this more robust
        if(php_sapi_name() === 'cli' && !isset($_ENV['whoops-test'])) {
            return Handler::DONE;
        }

        // Get the 'pretty-template.php' template file
        // @todo: this can be made more dynamic &&|| cleaned-up
        if(!($resources = $this->getResourcesPath())) {
            $resources = __DIR__ . '/../Resources';
        }

        $templateFile = "$resources/pretty-template.php";

        // @todo: Make this more reliable,
        // possibly by adding methods to append CSS & JS to the page
        $cssFile = "$resources/pretty-page.css";

        // Prepare the $v global variable that will pass relevant
        // information to the template
        $inspector = $this->getInspector();
        $frames    = $inspector->getFrames();

        $v = (object) array(
            'title'        => $this->getPageTitle(),
            'name'         => explode('\\', $inspector->getExceptionName()),
            'message'      => $inspector->getException()->getMessage(),
            'frames'       => $frames,
            'hasFrames'    => !!count($frames),
            'handler'      => $this,
            'handlers'     => $this->getRun()->getHandlers(),
            'pageStyle'    => file_get_contents($cssFile),

            'tables'      => array(
                'Server/Request Data'   => $_SERVER,
                'GET Data'              => $_GET,
                'POST Data'             => $_POST,
                'Files'                 => $_FILES,
                'Cookies'               => $_COOKIE,
                'Session'               => isset($_SESSION) ? $_SESSION:  array(),
                'Environment Variables' => $_ENV
            )
        );

        // Add extra entries list of data tables:
        $v->tables = array_merge($this->getDataTables(), $v->tables);

        call_user_func(function() use($templateFile, $v) {
            // $e -> cleanup output
            $e    = function($_) { return htmlspecialchars($_, ENT_QUOTES, 'UTF-8'); };

            // $slug -> sluggify string (i.e: Hello world! -> hello-world)
            $slug = function($_) {
                $_ = str_replace(" ", "-", $_);
                $_ = preg_replace('/[^\w\d\-\_]/i', '', $_);
                return strtolower($_);
            };

            require $templateFile;
        });


        return Handler::QUIT;
    }

    /**
     * Adds an entry to the list of tables displayed in the template.
     * The expected data is a simple associative array. Any nested arrays
     * will be flattened with print_r
     * @param string $label
     * @param array  $data
     */
    public function addDataTable($label, array $data)
    {
        $this->extraTables[$label] = $data;
    }

    /**
     * Returns all the extra data tables registered with this handler.
     * Optionally accepts a 'label' parameter, to only return the data
     * table under that label.
     * @param string|null $label
     * @return array[]
     */
    public function getDataTables($label = null)
    {
        if($label !== null) {
            return isset($this->extraTables[$label]) ?
                   $this->extraTables[$label] : array();
        }

        return $this->extraTables;
    }

    /**
     * @var string
     */
    public function setPageTitle($title)
    {
        $this->pageTitle = (string) $title;
    }

    /**
     * @return string
     */
    public function getPageTitle()
    {
        return $this->pageTitle;
    }

    /**
     * @return string
     */
    public function getResourcesPath()
    {
        return $this->resourcesPath;
    }

    /**
     * @param string $resourcesPath
     */
    public function setResourcesPath($resourcesPath)
    {
        if(!is_dir($resourcesPath)) {
            throw new InvalidArgumentException(
                "$resourcesPath is not a valid directory"
            );
        }

        $this->resourcesPath = $resourcesPath;
    }
}