<?php
// Processwire module to allow tiff image upload
//
// You must create a 'imagen_tiff' file upload field, and another 'imagen_web' image field.
// This module hooks on InputfieldFile::fileAdded and creates a temporary .png image through Imagick
// It then adds this temp .png to the 'imagen_web' field


class AjaxTiffToPng extends WireData implements Module {

    /**
    * Basic information about module
    */
    public static function getModuleInfo() {
	    return array(
		   'title' => 'Ajax Tiff a PNG',
		   'summary' => 'Converts tiff image from imagen_tiff field to png and saves in the imagen_web field',
		   'href' => '',
		   'version' => 001,
		   'permanent' => false,
		   'autoload' => true,
		   'singular' => true,
	    );
    }

    public function ready(){
      $this->addHookBefore('InputfieldFile::fileAdded', $this, 'AjaxConvertTiff', array('priority'=>10));
    }


    function AjaxConvertTiff(HookEvent $event){
      $field = $event->object;
      if($field->name != "imagen_tiff") return; // only for this specific field

      $pageid = null;
      $process = $this->wire('process');

      $pagefile = $event->argumentsByName("pagefile");

      if($pagefile) {
          $action = 'upload';
          $pageid = $pagefile->pagefiles->getPage()->id;
          $field = $this->wire('fields')->get($field->name);
          $fieldid = $field->id;
      }else {
          $action = 'save';
          $pageid = $event->arguments(0)->id;
      }

      if(!$pageid) return; //avoids interactions with other modules

      if(method_exists($this->wire('pages')->get($pageid), 'getForPage')) {
          $editedPage = $this->wire('pages')->get($pageid)->getForPage();
      }
      elseif($this->wire('input')->get->context == 'PageTable') {
          $editedPage = $this->wire('pages')->get("FieldtypePageTable=".$process->getPage().", include=all");
      }
      else {
          $editedPage = $this->wire('pages')->get($pageid);
      }

      // Tiff image conversion
      $tiffImgPath = $pagefile->filename();
      $tiffImgName = $pagefile->basename(false);
      // Save the temp PNG
      $maxWidth = 1024;
      $maxHeight = 768;
      $img = new Imagick($tiffImgPath);
      // Size calculation
      $d = $img->getImageGeometry();
      $w = min($d['width'], $maxWidth);
      $h = min($d['height'], $maxHeight);
      // Image conversion
      $img->setImageFormat('png');
      $img->setCompressionQuality(97);
      $img->setImageResolution(72, 72);
      $img->resizeImage($w,$h, Imagick::FILTER_LANCZOS, 1, true);
      // Save image temp
      $tempDir = wire()->files->tempDir('tiffpng')->get() . $tiffImgName .'.png';
      $img->writeImage($tempDir);
      // Delete existing images
      $editedPage->of(false);
      $editedPage->imagen_web->deleteAll();
      // Save new image in imagen_web field
      $editedPage->imagen_web->add($tempDir);
      $editedPage->save("imagen_web");
    }
}

?>