<?php

class Ps2_Thumbnail {

  protected $_original;

  protected $_originalwidth;

  protected $_originalheight;

  protected $_thumbwidth;

  protected $_thumbheight;

  protected $_maxSize = 120;

  protected $_canProcess = false;

  protected $_imageType;

  protected $_destination;

  protected $_name;

  protected $_suffix = '_thb';

  protected $_messages = array();



  public function __construct($image) {

	if (is_file($image) && is_readable($image)) {

	  $details = getimagesize($image);

	} else {

	  $details = null;

	  $this->_messages[] = "Cannot open $image.";

	}

	// if getimagesize() returns an array, it looks like an image

	if (is_array($details)) {

  	  $this->_original = $image;

	  $this->_originalwidth = $details[0];

	  $this->_originalheight = $details[1];

	  // check the MIME type

      $this->checkType($details['mime']);

	} else {

	  $this->_messages[] = "$image doesn't appear to be an image."; 

	}

  }



  public function setDestination($destination) {

	if (is_dir($destination) && is_writable($destination)) {

       // get last character

	   $last = substr($destination, -1);

	   // add a trailing slash if missing

	  if ($last == '/' || $last == '\\') {

		$this->_destination = $destination;

	  } else {

	    $this->_destination = $destination . DIRECTORY_SEPARATOR;

	  }

	} else {

	  $this->_messages[] = "Cannot write to $destination.";

	}

  }



  public function setMaxSize($size) {

	if (is_numeric($size)) {

	  $this->_maxSize = abs($size);

	}

  }

  

  public function setSuffix($suffix) {

	if (preg_match('/^\w+$/', $suffix)) {

	  if (strpos($suffix, '_') !== 0) {

	    $this->_suffix = '_' . $suffix;

	  } else {

		$this->_suffix = $suffix;

	  }

	} else {

      $this->_suffix = ''; 

	}

  }



  public function create() {

    if ($this->_canProcess && $this->_originalwidth != 0) {

	  $this->calculateSize($this->_originalwidth, $this->_originalheight);

	  $this->getName();

	  $this->createThumbnail();

	} elseif ($this->_originalwidth == 0) {

	  $this->_messages[] = 'Cannot determine size of ' . $this->_original; 

	}

  }

  

  public function getMessages() {

	return $this->_messages;

  }



/*

  public function test() {

	echo 'File: ' . $this->_original . '<br>';

	echo 'Original width: ' . $this->_originalwidth . '<br>';

	echo 'Original height: ' . $this->_originalheight . '<br>';

	echo 'Image type: ' . $this->_imageType . '<br>';

	echo 'Destination: ' . $this->_destination . '<br>';

	echo 'Max size: ' . $this->_maxSize .  '<br>';

	echo 'Suffix: ' . $this->_suffix .  '<br>';

	echo 'Thumb width: ' . $this->_thumbwidth . '<br>';

	echo 'Thumb height: ' . $this->_thumbheight . '<br>';

	echo 'Base name: ' . $this->_name . '<br>';

	if ($this->_messages) {

	  print_r($this->_messages);

	}

  }

*/

  protected function checkType($mime) {

	$mimetypes = array('image/jpeg', 'image/png', 'image/gif');

	if (in_array($mime, $mimetypes)) {

	  $this->_canProcess = true;

	  // extract the characters after 'image/'

	  $this->_imageType = substr($mime, 6);

	}

  }

  

  protected function calculateSize($width, $height) {

	if ($width <= $this->_maxSize && $height <= $this->_maxSize) {

	  $ratio = 1;

	} elseif ($width > $height) {

	  $ratio = $this->_maxSize/$width;

	} else {

	  $ratio = $this->_maxSize/$height;

	}

	$this->_thumbwidth = round($width * $ratio);

	$this->_thumbheight = round($height * $ratio);

  }



  protected function getName() {

	$extensions = array('/\.jpg$/i', '/\.jpeg$/i', '/\.png$/i', '/\.gif$/i');

	$this->_name = preg_replace($extensions, '', basename($this->_original));

  }



  protected function createImageResource() {

	if ($this->_imageType == 'jpeg') {

	  return imagecreatefromjpeg($this->_original);

	} elseif ($this->_imageType == 'png') {

	  return imagecreatefrompng($this->_original);

	} elseif ($this->_imageType == 'gif') {

      return imagecreatefromgif($this->_original); 

	}

  }



  protected function createThumbnail() {

	$resource = $this->createImageResource();

	$thumb = imagecreatetruecolor($this->_thumbwidth, $this->_thumbheight);

	imagecopyresampled($thumb, $resource, 0, 0, 0, 0, $this->_thumbwidth, $this->_thumbheight, $this->_originalwidth, $this->_originalheight);

	$newname = $this->_name . $this->_suffix;

	if ($this->_imageType == 'jpeg') {

	  $newname .= '.jpg';

	  $success = imagejpeg($thumb, $this->_destination . $newname, 100);

	} elseif ($this->_imageType == 'png') {

	  $newname .= '.png';

	  $success = imagepng($thumb, $this->_destination . $newname);

	} elseif ($this->_imageType == 'gif') {

	  $newname .= '.gif';

	  $success = imagegif($thumb, $this->_destination . $newname);

	}

	if ($success) {

	  $this->_messages[] = "$newname created successfully.";

	} else {

      $this->_messages[] = "Couldn't create a thumbnail for " . basename($this->_original); 

	}

	imagedestroy($resource);

	imagedestroy($thumb);

  }



}