<?php

require_once "SimpleImage.class.php";

header("Content-Type: image/jpg");

if(file_exists($_GET["src"]) === false) {
    header("HTTP/1.0 404 Not Found");
    die();
}

$existingSize = false;
$maxWidth = +($_GET["width"]);
$maxHeight = +($_GET["height"]);
$filenameParts = pathinfo($_GET["src"]);
$resizedNameTpl = "%s/%s_%ux%u.%s";
$image = new SimpleImage($_GET["src"]);

if($image->getWidth() > $image->getHeight()) {
    $ratio = $maxWidth / $image->getWidth();
    $newHeight = $image->getHeight() * $ratio;
    $resizedName = sprintf(
        $resizedNameTpl,
        $filenameParts["dirname"],
        $filenameParts["filename"],
        $maxWidth,
        $newHeight,
        $filenameParts["extension"]
    );
    $existingSize = file_exists($resizedName);

    if(!$existingSize) {
        $image->resizeToWidth($maxWidth);
    }
}
else {
    $ratio = $maxHeight / $image->getHeight();
    $newWidth = $image->getWidth() * $ratio;
    $resizedName = sprintf(
        $resizedNameTpl,
        $filenameParts["dirname"],
        $filenameParts["filename"],
        $newWidth,
        $maxHeight,
        $filenameParts["extension"]
    );
    $existingSize = file_exists($resizedName);

    if(!$existingSize) {
        $image->resizeToHeight($maxHeight);
    }
}

if(!$existingSize) {
    $image->save($resizedName);
}

echo file_get_contents($resizedName);

?>