<?php
namespace imagestore;

class Controller_Image extends Controller_Base
{
    public function handle($uri)
    {
        if (!isset($_GET['path'])) {
            return $this->error('400 Bad request', 'Path missing');
        }

        $path = $GLOBALS['imagestore']['basedir'] . $_GET['path'];
        if (!file_exists($path)) {
            return $this->error('404 Not Found', 'File not found');
        }
        
        if (!isset($_GET['w']) && !isset($_GET['h'])) {
            header('Content-type: image/jpeg');
            header('Content-length: ' . filesize($path));
            return readfile($path);
        }
        
        //resize
        $img = imagecreatefromjpeg($path);
        $oldX = $oldY = 0;
        $oldW = imagesx($img);
        $oldH = imagesy($img);

        if (isset($_GET['w']) && isset($_GET['h'])) {
            //max. bounding box respecting aspect ratio
            $newW = (int) $_GET['w'];
            $newH = (int) $_GET['h'];

            $rW = $oldW / $newW;
            $rH = $oldH / $newH;
            if ($rW > $rH) {
                $newOldW = intval($oldW / $rW * $rH);
                $oldX = $oldW / 2 - $newOldW / 2;
                $oldW = $newOldW;
            } else {
                $newOldH = intval($oldH / $rH * $rW);
                $oldY = $oldH / 2 - $newOldH / 2;
                $oldH = $newOldH;
            }
        } else if (isset($_GET['w'])) {
            $newW = (int) $_GET['w'];
            $newH = intval($newW / $oldW * $oldH);
        } else {
            $newH = (int) $_GET['h'];
            $newW = intval($newH / $oldH * $oldW);
        }
        
        $thumb = imagecreatetruecolor($newW, $newH);
        // Resize
        imagecopyresampled(
            $thumb, $img, 0, 0, $oldX, $oldY,
            $newW, $newH, $oldW, $oldH
        );
        imagedestroy($img);

        header('Content-type: image/jpeg');
        imagejpeg($thumb);
        imagedestroy($thumb);
    }
}
?>