package org.thoughtcrime.securesms.components;

import android.annotation.TargetApi;
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.os.Build.VERSION;
import android.os.Build.VERSION_CODES;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.View;
import android.view.animation.AlphaAnimation;
import android.view.animation.Animation;
import android.view.animation.Animation.AnimationListener;
import android.widget.FrameLayout;

import com.bumptech.glide.DrawableTypeRequest;
import com.bumptech.glide.GenericRequestBuilder;
import com.bumptech.glide.Glide;
import com.bumptech.glide.request.RequestListener;
import com.bumptech.glide.request.target.Target;
import com.makeramen.roundedimageview.RoundedImageView;
import com.pnikosis.materialishprogress.ProgressWheel;

import org.thoughtcrime.securesms.R;
import org.thoughtcrime.securesms.crypto.MasterSecret;
import org.thoughtcrime.securesms.jobs.PartProgressEvent;
import org.thoughtcrime.securesms.mms.DecryptableStreamUriLoader.DecryptableUri;
import org.thoughtcrime.securesms.mms.Slide;
import org.thoughtcrime.securesms.mms.SlideDeck;
import org.thoughtcrime.securesms.util.FutureTaskListener;
import org.thoughtcrime.securesms.util.ListenableFutureTask;
import org.thoughtcrime.securesms.util.Util;

import de.greenrobot.event.EventBus;
import ws.com.google.android.mms.pdu.PduPart;

public class ThumbnailView extends FrameLayout {
  private static final String TAG = ThumbnailView.class.getSimpleName();

  private boolean          showProgress = true;
  private RoundedImageView image;
  private ProgressWheel    progress;

  private ListenableFutureTask<SlideDeck> slideDeckFuture        = null;
  private SlideDeckListener               slideDeckListener      = null;
  private ThumbnailClickListener          thumbnailClickListener = null;
  private String                          slideId                = null;
  private Slide                           slide                  = null;

  public ThumbnailView(Context context) {
    this(context, null);
  }

  public ThumbnailView(Context context, AttributeSet attrs) {
    this(context, attrs, 0);
  }

  public ThumbnailView(Context context, AttributeSet attrs, int defStyle) {
    super(context, attrs, defStyle);
    inflate(context, R.layout.thumbnail_view, this);
    image    = (RoundedImageView) findViewById(R.id.thumbnail_image);
    progress = (ProgressWheel)    findViewById(R.id.progress_wheel);
  }

  @Override protected void onAttachedToWindow() {
    super.onAttachedToWindow();
    if (!EventBus.getDefault().isRegistered(this)) EventBus.getDefault().registerSticky(this);
  }

  @Override protected void onDetachedFromWindow() {
    super.onDetachedFromWindow();
    EventBus.getDefault().unregister(this);
  }

  @SuppressWarnings("unused")
  public void onEventAsync(final PartProgressEvent event) {
    if (this.slide != null && event.partId.equals(this.slide.getPart().getPartId())) {
      Util.runOnMain(new Runnable() {
        @Override public void run() {
          progress.setInstantProgress(((float) event.progress) / event.total);
          if (event.progress >= event.total) animateOutProgress();
        }
      });
    }
  }

  public void setImageResource(@Nullable MasterSecret masterSecret,
                               long id, long timestamp,
                               @NonNull ListenableFutureTask<SlideDeck> slideDeckFuture)
  {
    if (this.slideDeckFuture != null && this.slideDeckListener != null) {
      this.slideDeckFuture.removeListener(this.slideDeckListener);
    }

    String slideId = id + "::" + timestamp;

    if (!slideId.equals(this.slideId)) {
      progress.setVisibility(GONE);
      image.setImageDrawable(null);
      this.slide   = null;
      this.slideId = slideId;
    }

    this.slideDeckListener = new SlideDeckListener(masterSecret);
    this.slideDeckFuture   = slideDeckFuture;
    this.slideDeckFuture.addListener(this.slideDeckListener);
  }

  public void setImageResource(@NonNull Slide slide, @Nullable MasterSecret masterSecret) {
    if (Util.equals(slide, this.slide)) {
      Log.w(TAG, "Not loading resource, slide was identical");
      return;
    }
    if (!isContextValid()) {
      Log.w(TAG, "Not loading resource, context is invalid");
      return;
    }

    this.slide = slide;
    if (slide.isInProgress() && showProgress) {
      progress.spin();
      progress.setVisibility(VISIBLE);
    } else {
      progress.setVisibility(GONE);
    }
    buildGlideRequest(slide, masterSecret).into(image);
    setOnClickListener(new ThumbnailClickDispatcher(thumbnailClickListener, slide));
  }

  public void setThumbnailClickListener(ThumbnailClickListener listener) {
    this.thumbnailClickListener = listener;
  }

  public void clear() {
    if (isContextValid()) Glide.clear(this);
  }

  public void setShowProgress(boolean showProgress) {
    this.showProgress = showProgress;
    if (progress.getVisibility() == View.VISIBLE && !showProgress) {
      animateOutProgress();
    }
  }

  @TargetApi(VERSION_CODES.JELLY_BEAN_MR1)
  private boolean isContextValid() {
    return !(getContext() instanceof Activity)            ||
           VERSION.SDK_INT < VERSION_CODES.JELLY_BEAN_MR1 ||
           !((Activity)getContext()).isDestroyed();
  }

  private GenericRequestBuilder buildGlideRequest(@NonNull Slide slide,
                                                  @Nullable MasterSecret masterSecret)
  {
    final GenericRequestBuilder builder;
    if (slide.getThumbnailUri() != null) {
      builder = buildThumbnailGlideRequest(slide, masterSecret);
    } else {
      builder = buildPlaceholderGlideRequest(slide);
    }

    if (slide.isInProgress() && showProgress) {
      return builder;
    } else {
      return builder.error(R.drawable.ic_missing_thumbnail_picture);
    }
  }

  private GenericRequestBuilder buildThumbnailGlideRequest(Slide slide, MasterSecret masterSecret) {

    final GenericRequestBuilder builder;
    if   (slide.isDraft()) builder = buildDraftGlideRequest(slide, masterSecret);
    else                   builder = buildPartGlideRequest(slide, masterSecret);
    return builder;
  }

  private GenericRequestBuilder buildDraftGlideRequest(Slide slide, MasterSecret masterSecret) {
    final DrawableTypeRequest<?> request;
    if (masterSecret == null) request = Glide.with(getContext()).load(slide.getThumbnailUri());
    else                      request = Glide.with(getContext()).load(new DecryptableUri(masterSecret, slide.getThumbnailUri()));

    return request.asBitmap()
                  .fitCenter()
                  .listener(new PduThumbnailSetListener(slide.getPart()));
  }

  private GenericRequestBuilder buildPartGlideRequest(Slide slide, MasterSecret masterSecret) {
    if (masterSecret == null) {
      throw new IllegalStateException("null MasterSecret when loading non-draft thumbnail");
    }

    return  Glide.with(getContext()).load(new DecryptableUri(masterSecret, slide.getThumbnailUri()))
                                    .asBitmap()
                                    .centerCrop();
  }

  private GenericRequestBuilder buildPlaceholderGlideRequest(Slide slide) {
    return Glide.with(getContext()).load(slide.getPlaceholderRes(getContext().getTheme()))
                                   .asBitmap()
                                   .fitCenter();
  }

  private void animateOutProgress() {
    AlphaAnimation animation = new AlphaAnimation(1f, 0f);
    animation.setDuration(200);
    animation.setAnimationListener(new AnimationListener() {
      @Override public void onAnimationStart(Animation animation) { }
      @Override public void onAnimationRepeat(Animation animation) { }
      @Override public void onAnimationEnd(Animation animation) {
        progress.setVisibility(View.GONE);
      }
    });
    progress.startAnimation(animation);
  }

  private class SlideDeckListener implements FutureTaskListener<SlideDeck> {
    private final MasterSecret masterSecret;

    public SlideDeckListener(MasterSecret masterSecret) {
      this.masterSecret = masterSecret;
    }

    @Override
    public void onSuccess(final SlideDeck slideDeck) {
      if (slideDeck == null) return;

      final Slide slide = slideDeck.getThumbnailSlide(getContext());
      if (slide != null) {
        Util.runOnMain(new Runnable() {
          @Override
          public void run() {
            setImageResource(slide, masterSecret);
          }
        });
      } else {
        Util.runOnMain(new Runnable() {
          @Override
          public void run() {
            Log.w(TAG, "Resolved slide was null!");
            setVisibility(View.GONE);
          }
        });
      }
    }

    @Override
    public void onFailure(Throwable error) {
      Log.w(TAG, error);
      Util.runOnMain(new Runnable() {
        @Override
        public void run() {
          Log.w(TAG, "onFailure!");
          setVisibility(View.GONE);
        }
      });
    }
  }

  public interface ThumbnailClickListener {
    void onClick(View v, Slide slide);
  }

  private class ThumbnailClickDispatcher implements View.OnClickListener {
    private ThumbnailClickListener listener;
    private Slide                  slide;

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

    @Override
    public void onClick(View view) {
      if (listener != null) {
        listener.onClick(view, slide);
      } else {
        Log.w(TAG, "onClick, but no thumbnail click listener attached.");
      }
    }
  }

  private static class PduThumbnailSetListener implements RequestListener<Object, Bitmap> {
    private PduPart part;

    public PduThumbnailSetListener(@NonNull PduPart part) {
      this.part = part;
    }

    @Override
    public boolean onException(Exception e, Object model, Target<Bitmap> target, boolean isFirstResource) {
      return false;
    }

    @Override
    public boolean onResourceReady(Bitmap resource, Object model, Target<Bitmap> target, boolean isFromMemoryCache, boolean isFirstResource) {
      part.setThumbnail(resource);
      return false;
    }
  }

}