/**
 * Copyright (C) 2011 Whisper Systems
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.thoughtcrime.securesms;

import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.media.MediaScannerConnection;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.os.Message;
import android.preference.PreferenceManager;
import android.telephony.TelephonyManager;
import android.text.Spannable;
import android.text.format.DateUtils;
import android.text.style.ForegroundColorSpan;
import android.text.style.StyleSpan;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import org.thoughtcrime.securesms.crypto.MasterSecret;
import org.thoughtcrime.securesms.database.MessageRecord;
import org.thoughtcrime.securesms.database.MmsDatabase;
import org.thoughtcrime.securesms.database.MmsMessageRecord;
import org.thoughtcrime.securesms.mms.Slide;
import org.thoughtcrime.securesms.mms.SlideDeck;
import org.thoughtcrime.securesms.recipients.Recipient;
import org.thoughtcrime.securesms.recipients.RecipientFactory;
import org.thoughtcrime.securesms.recipients.RecipientFormattingException;
import org.thoughtcrime.securesms.service.SendReceiveService;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Iterator;
import java.util.List;

/**
 * A view that displays an individual conversation item within a conversation
 * thread.  Used by ComposeMessageActivity's ListActivity via a ConversationAdapter.
 *
 * @author Moxie Marlinspike
 *
 */

public class ConversationItem extends LinearLayout {

  private Handler       failedIconHandler;
  private MessageRecord messageRecord;
  private MasterSecret  masterSecret;

  private  TextView bodyText;
  private  TextView dateText;
  private  ImageView secureImage;
  private  ImageView failedImage;
  private  ImageView keyImage;
  private  ImageView contactPhoto;

  private  ImageView mmsThumbnail;
  private  Button    mmsDownloadButton;
  private  TextView  mmsDownloadingLabel;

  private final FailedIconClickListener failedIconClickListener   = new FailedIconClickListener();
  private final MmsDownloadClickListener mmsDownloadClickListener = new MmsDownloadClickListener();
  private final ClickListener clickListener                       = new ClickListener();
  private final Context context;

  public ConversationItem(Context context) {
    super(context);
    this.context = context;
   }

  public ConversationItem(Context context, AttributeSet attrs) {
    super(context, attrs);
    this.context = context;
  }

  @Override
  protected void onFinishInflate() {
    super.onFinishInflate();

    this.bodyText            = (TextView) findViewById(R.id.conversation_item_body);
    this.dateText            = (TextView) findViewById(R.id.conversation_item_date);
    this.secureImage         = (ImageView)findViewById(R.id.sms_secure_indicator);
    this.failedImage         = (ImageView)findViewById(R.id.sms_failed_indicator);
    this.keyImage            = (ImageView)findViewById(R.id.key_exchange_indicator);
    this.mmsThumbnail        = (ImageView)findViewById(R.id.image_view);
    this.mmsDownloadButton   = (Button)   findViewById(R.id.mms_download_button);
    this.mmsDownloadingLabel = (TextView) findViewById(R.id.mms_label_downloading);
    this.contactPhoto        = (ImageView)findViewById(R.id.contact_photo);

    setOnClickListener(clickListener);
    this.failedImage.setOnClickListener(failedIconClickListener);
    this.mmsDownloadButton.setOnClickListener(mmsDownloadClickListener);
  }

  public void set(MasterSecret masterSecret, MessageRecord messageRecord, Handler failedIconHandler)
  {
    this.messageRecord     = messageRecord;
    this.masterSecret      = masterSecret;
    this.failedIconHandler = failedIconHandler;

    // Double-dispatch back to methods below.
    messageRecord.setOnConversationItem(this);
  }

  public MessageRecord getMessageRecord() {
    return messageRecord;
  }

  public void setMessageRecord(MessageRecord messageRecord) {
    setBody(messageRecord);
    setStatusIcons(messageRecord);
    setEvents(messageRecord);
  }

  public void setMessageRecord(MmsMessageRecord messageRecord) {
    setMessageRecord((MessageRecord)messageRecord);

    if (messageRecord.isNotification())
      setMmsNotificationAttributes(messageRecord);
    else
      setMmsMediaAttributes(messageRecord);
  }

  private void setMmsNotificationAttributes(MmsMessageRecord messageRecord) {
    String messageSize = String.format(getContext().getString(R.string.message_size_d_kb),
                                       messageRecord.getMessageSize());
    String expires     = String.format(getContext().getString(R.string.expires_s),
                                       DateUtils.getRelativeTimeSpanString(getContext(),
                                                                           messageRecord.getExpiration(),
                                                                           false));

    dateText.setText(messageSize + "\n" + expires);

    if (MmsDatabase.Types.isDisplayDownloadButton(messageRecord.getStatus())) {
      mmsDownloadButton.setVisibility(View.VISIBLE);
      mmsDownloadingLabel.setVisibility(View.GONE);
    } else {
      mmsDownloadingLabel.setText(MmsDatabase.Types.getLabelForStatus(context, messageRecord.getStatus()));
      mmsDownloadButton.setVisibility(View.GONE);
      mmsDownloadingLabel.setVisibility(View.VISIBLE);
    }

    if (MmsDatabase.Types.isHardError(messageRecord.getStatus()))
      failedImage.setVisibility(View.VISIBLE);
  }

  private void setMmsMediaAttributes(MmsMessageRecord messageRecord) {
    SlideDeck slideDeck = messageRecord.getSlideDeck();
    List<Slide> slides  = slideDeck.getSlides();

    Iterator<Slide> iterator = slides.iterator();

    while (iterator.hasNext()) {
      Slide slide = iterator.next();
      if (slide.hasImage()) {
        mmsThumbnail.setImageBitmap(slide.getThumbnail());
        mmsThumbnail.setOnClickListener(new ThumbnailClickListener(slide));
        mmsThumbnail.setOnLongClickListener(new ThumbnailSaveListener(slide));
        mmsThumbnail.setVisibility(View.VISIBLE);
        return;
      }
    }

    mmsThumbnail.setVisibility(View.GONE);
  }

  public void setHandler(Handler failedIconHandler) {
    this.failedIconHandler = failedIconHandler;
  }

  private void checkForAutoInitiate(MessageRecord messageRecord) {
    if (AutoInitiateActivity.isValidAutoInitiateSituation(context, masterSecret, messageRecord.getRecipients().getPrimaryRecipient(), messageRecord.getBody(), messageRecord.getThreadId())) {
      AutoInitiateActivity.exemptThread(context, messageRecord.getThreadId());
      Intent intent = new Intent();
      intent.setClass(context, AutoInitiateActivity.class);
      intent.putExtra("threadId", messageRecord.getThreadId());
      intent.putExtra("masterSecret", masterSecret);
      intent.putExtra("recipient", messageRecord.getRecipients().getPrimaryRecipient());

      context.startActivity(intent);
    }
  }

  private void setBodyText(MessageRecord messageRecord) {
    String body = messageRecord.getBody();

    if      (messageRecord.isKeyExchange() && messageRecord.isOutgoing())           body    = "\n" + getContext().getString(R.string.key_exchange_message2);
    else if (messageRecord.isProcessedKeyExchange() && !messageRecord.isOutgoing()) body    = "\n" + getContext().getString(R.string.received_and_processed_key_exchange_message);
    else if (messageRecord.isStaleKeyExchange())                                    body    = "\n" + getContext().getString(R.string.error_received_stale_key_exchange_message);
    else if (messageRecord.isKeyExchange() && !messageRecord.isOutgoing())          body    = "\n" + getContext().getString(R.string.received_key_exchange_message_click_to_process);

    bodyText.setText(body, TextView.BufferType.SPANNABLE);

    if (messageRecord.isKeyExchange() || messageRecord.getEmphasis()) {
      ((Spannable)bodyText.getText()).setSpan(new ForegroundColorSpan(context.getResources().getColor(android.R.color.darker_gray)), 0, body.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
      ((Spannable)bodyText.getText()).setSpan(new StyleSpan(android.graphics.Typeface.ITALIC), 0, body.length(), Spannable.SPAN_EXCLUSIVE_EXCLUSIVE);
    }
  }

  private void setContactPhotoForUserIdentity() {
    String configuredContact = PreferenceManager.getDefaultSharedPreferences(context).getString(ApplicationPreferencesActivity.IDENTITY_PREF, null);

    try {
      if (configuredContact != null) {
        Recipient recipient = RecipientFactory.getRecipientForUri(context, Uri.parse(configuredContact));
        if (recipient != null) {
          contactPhoto.setImageBitmap(recipient.getContactPhoto());
          return;
        }
      }

      if (hasLocalNumber()) {
        contactPhoto.setImageBitmap(RecipientFactory.getRecipientsFromString(context, getLocalNumber()).getPrimaryRecipient().getContactPhoto());
      } else {
        contactPhoto.setImageDrawable(context.getResources().getDrawable(R.drawable.ic_contact_picture));
      }
    } catch (RecipientFormattingException rfe) {
      Log.w("ConversationItem", rfe);
    }
  }

  private void setBodyImage(MessageRecord messageRecord) {
    Recipient recipient = messageRecord.getMessageRecipient();

    if (!messageRecord.isOutgoing()) contactPhoto.setImageBitmap(recipient.getContactPhoto());
    else                             setContactPhotoForUserIdentity();

    contactPhoto.setVisibility(View.VISIBLE);
  }

  private void setBody(MessageRecord messageRecord) {
    setBodyText(messageRecord);
    setBodyImage(messageRecord);
  }

  private String getLocalNumber() {
    return ((TelephonyManager)context.getSystemService(Context.TELEPHONY_SERVICE)).getLine1Number();
  }

  private boolean hasLocalNumber() {
    String number = getLocalNumber();
    return (number != null) && (number.trim().length() > 0);
  }

  private void setStatusIcons(MessageRecord messageRecord) {
    failedImage.setVisibility(messageRecord.isFailed() ? View.VISIBLE : View.GONE);
    secureImage.setVisibility(messageRecord.isSecure() ? View.VISIBLE : View.GONE);
    keyImage.setVisibility(messageRecord.isKeyExchange() ? View.VISIBLE : View.GONE);

    mmsThumbnail.setVisibility(View.GONE);
    mmsDownloadButton.setVisibility(View.GONE);
    mmsDownloadingLabel.setVisibility(View.GONE);

    if      (messageRecord.isFailed())  dateText.setText(R.string.error_sending_message);
    else if (messageRecord.isPending()) dateText.setText(R.string.sending);
    else    dateText.setText(DateUtils.getRelativeTimeSpanString(getContext(),
                                                                 messageRecord.getDate(),
                                                                 false));
  }

  private void setEvents(MessageRecord messageRecord) {
    setClickable(messageRecord.isKeyExchange() && !messageRecord.isOutgoing());

    if (!messageRecord.isOutgoing() && messageRecord.getRecipients().isSingleRecipient())
      checkForAutoInitiate(messageRecord);
  }

  private void handleKeyExchangeClicked() {
    Intent intent = new Intent(context, ReceiveKeyActivity.class);
    intent.putExtra("recipient", messageRecord.getRecipients().getPrimaryRecipient());
    intent.putExtra("body", messageRecord.getBody());
    intent.putExtra("thread_id", messageRecord.getThreadId());
    intent.putExtra("master_secret", masterSecret);
    intent.putExtra("sent", messageRecord.isOutgoing());
    context.startActivity(intent);
  }

  private class ThumbnailSaveListener extends Handler implements View.OnLongClickListener, Runnable, MediaScannerConnection.MediaScannerConnectionClient {
    private static final int SUCCESS              = 0;
    private static final int FAILURE              = 1;
    private static final int WRITE_ACCESS_FAILURE = 2;

    private final Slide slide;
    private ProgressDialog progressDialog;
    private MediaScannerConnection mediaScannerConnection;
    private File mediaFile;

    public ThumbnailSaveListener(Slide slide) {
      this.slide = slide;
    }

    public void run() {
      if (!Environment.getExternalStorageDirectory().canWrite()) {
        this.obtainMessage(WRITE_ACCESS_FAILURE).sendToTarget();
        return;
      }

      try {
        mediaFile                 = constructOutputFile();
        InputStream inputStream   = slide.getPartDataInputStream();
        OutputStream outputStream = new FileOutputStream(mediaFile);

        byte[] buffer = new byte[4096];
        int read;

        while ((read = inputStream.read(buffer)) != -1) {
          outputStream.write(buffer, 0, read);
        }

        outputStream.close();
        inputStream.close();

        mediaScannerConnection = new MediaScannerConnection(context, this);
        mediaScannerConnection.connect();
      } catch (IOException ioe) {
        Log.w("ConversationItem", ioe);
        this.obtainMessage(FAILURE).sendToTarget();
      }
    }

    private File constructOutputFile() throws IOException {
      File sdCard = Environment.getExternalStorageDirectory();
      File outputDirectory;

      if (slide.hasVideo())
        outputDirectory = new File(sdCard.getAbsoluteFile() + File.separator + "Movies");
      else if (slide.hasAudio())
        outputDirectory = new File(sdCard.getAbsolutePath() + File.separator + "Music");
      else
        outputDirectory = new File(sdCard.getAbsolutePath() + File.separator + "Pictures");

      outputDirectory.mkdirs();
      return File.createTempFile("textsecure", ".attach", outputDirectory);
    }

    private void saveToSdCard() {
      progressDialog = new ProgressDialog(context);
      progressDialog.setTitle(context.getString(R.string.saving_attachment));
      progressDialog.setMessage(context.getString(R.string.saving_attachment_to_sd_card));
      progressDialog.setCancelable(false);
      progressDialog.setIndeterminate(true);
      progressDialog.setProgressStyle(ProgressDialog.STYLE_SPINNER);
      progressDialog.show();
      new Thread(this).start();
    }

    public boolean onLongClick(View v) {
      AlertDialog.Builder builder = new AlertDialog.Builder(context);
      builder.setTitle(R.string.save_to_sd_card);
      builder.setIcon(android.R.drawable.ic_dialog_alert);
      builder.setCancelable(true);
      builder.setMessage(R.string.this_media_has_been_stored_in_an_encrypted_database_warning);
      builder.setPositiveButton(R.string.yes, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
          saveToSdCard();
        }
      });
      builder.setNegativeButton(R.string.no, null);
      builder.show();

      return true;
    }

    @Override
    public void handleMessage(Message message) {
      switch (message.what) {
      case FAILURE:
        Toast.makeText(context, R.string.error_while_saving_attachment_to_sd_card,
                       Toast.LENGTH_LONG).show();
        break;
      case SUCCESS:
        Toast.makeText(context, R.string.success_exclamation,
                       Toast.LENGTH_LONG).show();
        break;
      case WRITE_ACCESS_FAILURE:
        Toast.makeText(context, R.string.unable_to_write_to_sd_card_exclamation,
                       Toast.LENGTH_LONG).show();
        break;
      }

      progressDialog.dismiss();
    }

    public void onMediaScannerConnected() {
      mediaScannerConnection.scanFile(mediaFile.getAbsolutePath(), slide.getContentType());
    }

    public void onScanCompleted(String path, Uri uri) {
      mediaScannerConnection.disconnect();
      this.obtainMessage(SUCCESS).sendToTarget();
    }
  }

  private class ThumbnailClickListener implements View.OnClickListener {
    private final Slide slide;

    public ThumbnailClickListener(Slide slide) {
      this.slide = slide;
    }

    private void fireIntent() {
      Log.w("ConversationItem", "Clicked: " + slide.getUri() + " , " + slide.getContentType());
      Intent intent = new Intent(Intent.ACTION_VIEW);
      intent.addFlags(Intent.FLAG_GRANT_READ_URI_PERMISSION);
      intent.setDataAndType(slide.getUri(), slide.getContentType());
      context.startActivity(intent);
    }

    public void onClick(View v) {
      AlertDialog.Builder builder = new AlertDialog.Builder(context);
      builder.setTitle(R.string.view_secure_media_question);
      builder.setIcon(android.R.drawable.ic_dialog_alert);
      builder.setCancelable(true);
      builder.setMessage(R.string.this_media_has_been_stored_in_an_encrypted_database_external_viewer_warning);
      builder.setPositiveButton(R.string.yes, new DialogInterface.OnClickListener() {
        public void onClick(DialogInterface dialog, int which) {
          fireIntent();
        }
      });
      builder.setNegativeButton(R.string.no, null);
      builder.show();
    }
  }

  private class MmsDownloadClickListener implements View.OnClickListener {
    public void onClick(View v) {
      Log.w("MmsDownloadClickListener", "Content location: " + new String(((MmsMessageRecord)messageRecord).getContentLocation()));
      mmsDownloadButton.setVisibility(View.GONE);
      mmsDownloadingLabel.setVisibility(View.VISIBLE);

      Intent intent = new Intent(context, SendReceiveService.class);
      intent.putExtra("content_location", new String(((MmsMessageRecord)messageRecord).getContentLocation()));
      intent.putExtra("message_id", ((MmsMessageRecord)messageRecord).getId());
      intent.putExtra("transaction_id", ((MmsMessageRecord)messageRecord).getTransactionId());
      intent.putExtra("thread_id", ((MmsMessageRecord)messageRecord).getThreadId());
      intent.setAction(SendReceiveService.DOWNLOAD_MMS_ACTION);
      context.startService(intent);
    }
  }

  private class FailedIconClickListener implements View.OnClickListener {
    public void onClick(View v) {
      if (failedIconHandler != null && !messageRecord.isKeyExchange()) {
        Message message = Message.obtain();
        message.obj     = messageRecord.getBody();
        failedIconHandler.dispatchMessage(message);
      }
    }
  }

  private class ClickListener implements View.OnClickListener {
    public void onClick(View v) {
      if (messageRecord.isKeyExchange()           &&
          !messageRecord.isOutgoing()             &&
          !messageRecord.isProcessedKeyExchange() &&
          !messageRecord.isStaleKeyExchange())
        handleKeyExchangeClicked();
    }
  }

}