//  FileStack extension for App Inventor by Marco Perrone

package FileStack;

import com.google.appinventor.components.runtime.*;
import android.app.Activity;
import android.content.Intent;
			

import com.google.appinventor.components.annotations.DesignerComponent;
import com.google.appinventor.components.annotations.DesignerProperty;
import com.google.appinventor.components.annotations.PropertyCategory;
import com.google.appinventor.components.annotations.SimpleFunction;
import com.google.appinventor.components.annotations.SimpleEvent;
import com.google.appinventor.components.annotations.SimpleObject;
import com.google.appinventor.components.annotations.SimpleProperty;
import com.google.appinventor.components.annotations.UsesPermissions;
import com.google.appinventor.components.annotations.UsesActivities;
import com.google.appinventor.components.annotations.UsesLibraries;
import com.google.appinventor.components.annotations.UsesActivityMetadata;
import com.google.appinventor.components.annotations.androidmanifest.*;
import com.google.appinventor.components.common.ComponentCategory;
import com.google.appinventor.components.common.PropertyTypeConstants;
import com.google.appinventor.components.common.YaVersion;
import com.google.appinventor.components.runtime.util.GingerbreadUtil;
import com.google.appinventor.components.runtime.util.SdkLevel;

import java.io.IOException;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.DataOutputStream;
import java.io.BufferedReader;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.Scanner;
import java.net.CookieHandler;



import java.io.FileWriter;
import java.io.BufferedWriter;
import java.io.StringWriter;
import java.io.PrintWriter;



@SimpleObject(external=true)
@UsesPermissions(permissionNames = "android.permission.INTERNET,android.permission.READ_EXTERNAL_STORAGE,android.permission.WRITE_EXTERNAL_STORAGE")

@DesignerComponent(version = YaVersion.WEB_COMPONENT_VERSION,
    description = "<p>Non-visible component to save image on webserver.", 
    category = ComponentCategory.EXTENSION,
    nonVisible = true,
    iconName = "images/FileStack.png")
	
public class FileStack extends AndroidNonvisibleComponent implements Component {

	private final Activity activity;
	private final CookieHandler cookieHandler;
	
	@SimpleEvent(description = "Get FileStack Response")
  public void getFileStackResponse(String Response) {
    
    EventDispatcher.dispatchEvent(this, "getFileStackResponse", Response);
  }
  
	@SimpleFunction(description = "Upload File to FileStack.")
  public void uploadToFileStack(String ObjectLocation) {
	 
	 try {
			sFTS(ObjectLocation);
		}
	catch(IOException e) {
		e.printStackTrace();
	}	  
  }
  public FileStack(ComponentContainer container) {
    super(container.$form());
    activity = container.$context();
    cookieHandler = (SdkLevel.getLevel() >= SdkLevel.LEVEL_GINGERBREAD)
        ? GingerbreadUtil.newCookieManager()
        : null;
  }

void sFTS(String OBJECT_LOCATION) throws IOException {
	try
	{
		HttpURLConnection connection = null;
		DataOutputStream outputStream = null;
		InputStream inputStream = null;

		String twoHyphens = "--";
		String boundary =  "*****"+Long.toString(System.currentTimeMillis())+"*****";
		String lineEnd = "\r\n";

		int bytesRead, bytesAvailable, bufferSize;
		byte[] buffer;
		int maxBufferSize = 1*1024*1024;

		String filefield = "image";

		String[] q = OBJECT_LOCATION.split("/");
		int idx = q.length - 1;
		appendLog("File Position: "+ OBJECT_LOCATION);
		File file = new File(OBJECT_LOCATION);
		FileInputStream fileInputStream = new FileInputStream(file);

		URL url = new URL("https://imageserver.com");
		connection = (HttpURLConnection) url.openConnection();

		connection.setDoInput(true);
		connection.setDoOutput(true);
		connection.setUseCaches(false);

		connection.setRequestMethod("POST");
		connection.setRequestProperty("Connection", "Keep-Alive");
		connection.setRequestProperty("User-Agent", "Android Multipart HTTP Client 1.0");
		connection.setRequestProperty("Content-Type", "multipart/form-data; boundary="+boundary);
    

		outputStream = new DataOutputStream(connection.getOutputStream());
		outputStream.writeBytes(twoHyphens + boundary + lineEnd);
		outputStream.writeBytes("Content-Disposition: form-data; name=\"" + filefield + "\"; filename=\"" + q[idx] +"\"" + lineEnd);
		outputStream.writeBytes("Content-Type: image/jpeg" + lineEnd);
		outputStream.writeBytes("Content-Transfer-Encoding: binary" + lineEnd);
		outputStream.writeBytes(lineEnd);

		bytesAvailable = fileInputStream.available();
		bufferSize = Math.min(bytesAvailable, maxBufferSize);
		buffer = new byte[bufferSize];

		bytesRead = fileInputStream.read(buffer, 0, bufferSize);
		while(bytesRead > 0) {
			outputStream.write(buffer, 0, bufferSize);
			bytesAvailable = fileInputStream.available();
			bufferSize = Math.min(bytesAvailable, maxBufferSize);
			bytesRead = fileInputStream.read(buffer, 0, bufferSize);
		}

		outputStream.writeBytes(lineEnd);
		outputStream.writeBytes(twoHyphens + boundary + twoHyphens + lineEnd);

		inputStream = connection.getInputStream();

		int status = connection.getResponseCode();
		if (status == HttpURLConnection.HTTP_OK) {
			BufferedReader in = new BufferedReader(new InputStreamReader(connection.getInputStream()));
			String inputLine;
			StringBuffer response = new StringBuffer();

			while ((inputLine = in.readLine()) != null) {
				response.append(inputLine);
			}

			inputStream.close();
			connection.disconnect();
			fileInputStream.close();
			outputStream.flush();
			outputStream.close();

			getFileStackResponse(response.toString());
		} else {
			getFileStackResponse("Non ok response returned");
		}
	}
	catch (IOException e) {
				e.printStackTrace();
				StringWriter errors = new StringWriter();
				e.printStackTrace(new PrintWriter(errors));
				appendLog(errors.toString());
	}
}
public void appendLog(String text)
{       
   File logFile = new File("sdcard/FileStackLog.txt");
   if (!logFile.exists())
   {
      try
      {
         logFile.createNewFile();
      } 
      catch (IOException e)
      {
         // TODO Auto-generated catch block
         e.printStackTrace();
      }
   }
   try
   {
      //BufferedWriter for performance, true to set append to file flag
      BufferedWriter buf = new BufferedWriter(new FileWriter(logFile, true)); 
      buf.append(text);
      buf.newLine();
	  buf.flush();
      buf.close();
   }
   catch (IOException e)
   {
      // TODO Auto-generated catch block
      e.printStackTrace();
   }
}
}