/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.gecko.media;

import android.media.MediaCodec;
import android.media.MediaCodec.BufferInfo;
import android.media.MediaCodec.CryptoInfo;
import android.media.MediaFormat;
import android.os.Build;
import android.os.DeadObjectException;
import android.os.RemoteException;
import android.util.Log;
import android.util.SparseArray;
import androidx.annotation.RequiresApi;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;
import org.mozilla.gecko.annotation.WrapForJNI;
import org.mozilla.gecko.gfx.GeckoSurface;
import org.mozilla.gecko.mozglue.JNIObject;

// Proxy class of ICodec binder.
public final class CodecProxy {
  private static final String LOGTAG = "GeckoRemoteCodecProxy";
  private static final boolean DEBUG = false;
  @WrapForJNI private static final long INVALID_SESSION = -1;

  private ICodec mRemote;
  private long mSession;
  private boolean mIsEncoder;
  private FormatParam mFormat;
  private GeckoSurface mOutputSurface;
  private CallbacksForwarder mCallbacks;
  private String mRemoteDrmStubId;
  private Queue<Sample> mSurfaceOutputs = new ConcurrentLinkedQueue<>();
  private boolean mFlushed = true;

  private SparseArray<SampleBuffer> mInputBuffers = new SparseArray<>();
  private SparseArray<SampleBuffer> mOutputBuffers = new SparseArray<>();

  public interface Callbacks {
    void onInputStatus(long timestamp, boolean processed);

    void onOutputFormatChanged(MediaFormat format);

    void onOutput(Sample output, SampleBuffer buffer);

    void onError(boolean fatal);
  }

  @WrapForJNI
  public static class NativeCallbacks extends JNIObject implements Callbacks {
    public native void onInputStatus(long timestamp, boolean processed);

    public native void onOutputFormatChanged(MediaFormat format);

    public native void onOutput(Sample output, SampleBuffer buffer);

    public native void onError(boolean fatal);

    @Override // JNIObject
    protected void disposeNative() {
      throw new UnsupportedOperationException();
    }
  }

  private class CallbacksForwarder extends ICodecCallbacks.Stub {
    private final Callbacks mCallbacks;
    private boolean mCodecProxyReleased;

    CallbacksForwarder(final Callbacks callbacks) {
      mCallbacks = callbacks;
    }

    @Override
    public synchronized void onInputQueued(final long timestamp) throws RemoteException {
      if (!mCodecProxyReleased) {
        mCallbacks.onInputStatus(timestamp, true /* processed */);
      }
    }

    @Override
    public synchronized void onInputPending(final long timestamp) throws RemoteException {
      if (!mCodecProxyReleased) {
        mCallbacks.onInputStatus(timestamp, false /* processed */);
      }
    }

    @Override
    public synchronized void onOutputFormatChanged(final FormatParam format)
        throws RemoteException {
      if (!mCodecProxyReleased) {
        mCallbacks.onOutputFormatChanged(format.asFormat());
      }
    }

    @Override
    public synchronized void onOutput(final Sample sample) throws RemoteException {
      if (mCodecProxyReleased) {
        sample.dispose();
        return;
      }

      final SampleBuffer buffer = CodecProxy.this.getOutputBuffer(sample.bufferId);
      if (mOutputSurface != null) {
        // Don't render to surface just yet. Callback will make that happen when it's time.
        mSurfaceOutputs.offer(sample);
      } else if (buffer == null) {
        // Buffer with given ID has been flushed.
        sample.dispose();
        return;
      }
      mCallbacks.onOutput(sample, buffer);
    }

    @Override
    public void onError(final boolean fatal) throws RemoteException {
      reportError(fatal);
    }

    private synchronized void reportError(final boolean fatal) {
      if (!mCodecProxyReleased) {
        mCallbacks.onError(fatal);
      }
    }

    private synchronized void setCodecProxyReleased() {
      mCodecProxyReleased = true;
    }
  }

  @WrapForJNI
  public int GetInputFormatStride() {
    if (mFormat.asFormat().containsKey(MediaFormat.KEY_STRIDE)) {
      return mFormat.asFormat().getInteger(MediaFormat.KEY_STRIDE);
    }
    return 0;
  }

  @WrapForJNI
  public int GetInputFormatYPlaneHeight() {
    if (mFormat.asFormat().containsKey(MediaFormat.KEY_SLICE_HEIGHT)) {
      return mFormat.asFormat().getInteger(MediaFormat.KEY_SLICE_HEIGHT);
    }
    return 0;
  }

  @WrapForJNI
  public static CodecProxy create(
      final boolean isEncoder,
      final MediaFormat format,
      final GeckoSurface surface,
      final Callbacks callbacks,
      final String drmStubId) {
    return RemoteManager.getInstance()
        .createCodec(isEncoder, format, surface, callbacks, drmStubId);
  }

  public static CodecProxy createCodecProxy(
      final boolean isEncoder,
      final MediaFormat format,
      final GeckoSurface surface,
      final Callbacks callbacks,
      final String drmStubId) {
    return new CodecProxy(isEncoder, format, surface, callbacks, drmStubId);
  }

  private CodecProxy(
      final boolean isEncoder,
      final MediaFormat format,
      final GeckoSurface surface,
      final Callbacks callbacks,
      final String drmStubId) {
    mIsEncoder = isEncoder;
    mFormat = new FormatParam(format);
    mOutputSurface = surface;
    mRemoteDrmStubId = drmStubId;
    mCallbacks = new CallbacksForwarder(callbacks);
  }

  boolean init(final ICodec remote) {
    try {
      remote.setCallbacks(mCallbacks);
      if (!remote.configure(
          mFormat,
          mOutputSurface,
          mIsEncoder ? MediaCodec.CONFIGURE_FLAG_ENCODE : 0,
          mRemoteDrmStubId)) {
        return false;
      }
      remote.start();
    } catch (final RemoteException e) {
      e.printStackTrace();
      return false;
    }

    mRemote = remote;
    return true;
  }

  boolean deinit() {
    try {
      mRemote.stop();
      mRemote.release();
      mRemote = null;
      return true;
    } catch (final RemoteException e) {
      e.printStackTrace();
      return false;
    }
  }

  @WrapForJNI
  public synchronized boolean isAdaptivePlaybackSupported() {
    if (mRemote == null) {
      Log.e(LOGTAG, "cannot check isAdaptivePlaybackSupported with an ended codec");
      return false;
    }
    try {
      return mRemote.isAdaptivePlaybackSupported();
    } catch (final RemoteException e) {
      e.printStackTrace();
      return false;
    }
  }

  @WrapForJNI
  public synchronized boolean isHardwareAccelerated() {
    if (mRemote == null) {
      Log.e(LOGTAG, "cannot check isHardwareAccelerated with an ended codec");
      return false;
    }
    try {
      return mRemote.isHardwareAccelerated();
    } catch (final RemoteException e) {
      e.printStackTrace();
      return false;
    }
  }

  @WrapForJNI
  public synchronized boolean isTunneledPlaybackSupported() {
    if (mRemote == null) {
      Log.e(LOGTAG, "cannot check isTunneledPlaybackSupported with an ended codec");
      return false;
    }
    try {
      return mRemote.isTunneledPlaybackSupported();
    } catch (final RemoteException e) {
      e.printStackTrace();
      return false;
    }
  }

  @WrapForJNI
  public synchronized long input(
      final ByteBuffer bytes, final BufferInfo info, final CryptoInfo cryptoInfo) {
    if (mRemote == null) {
      Log.e(LOGTAG, "cannot send input to an ended codec");
      return INVALID_SESSION;
    }

    final boolean eos = info.flags == MediaCodec.BUFFER_FLAG_END_OF_STREAM;

    if (eos) {
      return sendInput(Sample.EOS);
    }

    try {
      final Sample s = mRemote.dequeueInput(info.size);
      fillInputBuffer(s.bufferId, bytes, info.offset, info.size);
      mSession = s.session;
      return sendInput(s.set(info, cryptoInfo));
    } catch (final RemoteException | NullPointerException e) {
      Log.e(LOGTAG, "fail to dequeue input buffer", e);
    } catch (final IOException e) {
      Log.e(LOGTAG, "fail to copy input data.", e);
      // Balance dequeue/queue.
      sendInput(null);
    }
    return INVALID_SESSION;
  }

  private void fillInputBuffer(
      final int bufferId, final ByteBuffer bytes, final int offset, final int size)
      throws RemoteException, IOException {
    if (bytes == null || size == 0) {
      Log.w(LOGTAG, "empty input");
      return;
    }

    SampleBuffer buffer = mInputBuffers.get(bufferId);
    if (buffer == null) {
      buffer = mRemote.getInputBuffer(bufferId);
      if (buffer != null) {
        mInputBuffers.put(bufferId, buffer);
      }
    }

    if (buffer.capacity() < size) {
      final IOException e =
          new IOException("data larger than capacity: " + size + " > " + buffer.capacity());
      Log.e(LOGTAG, "cannot fill input.", e);
      throw e;
    }

    buffer.readFromByteBuffer(bytes, offset, size);
  }

  private long sendInput(final Sample sample) {
    try {
      mRemote.queueInput(sample);
      if (sample != null) {
        sample.dispose();
        mFlushed = false;
      }
    } catch (final Exception e) {
      Log.e(LOGTAG, "fail to queue input:" + sample, e);
      return INVALID_SESSION;
    }
    return mSession;
  }

  @WrapForJNI
  public synchronized boolean flush() {
    if (mFlushed) {
      return true;
    }
    if (mRemote == null) {
      Log.e(LOGTAG, "cannot flush an ended codec");
      return false;
    }
    try {
      if (DEBUG) {
        Log.d(LOGTAG, "flush " + this);
      }
      resetBuffers();
      mRemote.flush();
      mFlushed = true;
    } catch (final DeadObjectException e) {
      return false;
    } catch (final RemoteException e) {
      e.printStackTrace();
      return false;
    }
    return true;
  }

  private void resetBuffers() {
    for (int i = 0; i < mInputBuffers.size(); ++i) {
      mInputBuffers.valueAt(i).dispose();
    }
    mInputBuffers.clear();
    for (int i = 0; i < mOutputBuffers.size(); ++i) {
      mOutputBuffers.valueAt(i).dispose();
    }
    mOutputBuffers.clear();
  }

  @WrapForJNI
  public boolean release() {
    mCallbacks.setCodecProxyReleased();
    synchronized (this) {
      if (mRemote == null) {
        Log.w(LOGTAG, "codec already ended");
        return true;
      }
      if (DEBUG) {
        Log.d(LOGTAG, "release " + this);
      }

      if (!mSurfaceOutputs.isEmpty()) {
        // Flushing output buffers to surface may cause some frames to be skipped and
        // should not happen unless caller release codec before processing all buffers.
        Log.w(LOGTAG, "release codec when " + mSurfaceOutputs.size() + " output buffers unhandled");
        try {
          for (final Sample s : mSurfaceOutputs) {
            mRemote.releaseOutput(s, true);
          }
        } catch (final RemoteException e) {
          e.printStackTrace();
        }
        mSurfaceOutputs.clear();
      }

      resetBuffers();

      try {
        RemoteManager.getInstance().releaseCodec(this);
      } catch (final DeadObjectException e) {
        return false;
      } catch (final RemoteException e) {
        e.printStackTrace();
        return false;
      }
      return true;
    }
  }

  @WrapForJNI
  public synchronized boolean setBitrate(final int bps) {
    if (!mIsEncoder) {
      Log.w(LOGTAG, "this api is encoder-only");
      return false;
    }

    if (android.os.Build.VERSION.SDK_INT < 19) {
      Log.w(LOGTAG, "this api was added in API level 19");
      return false;
    }

    if (mRemote == null) {
      Log.w(LOGTAG, "codec already ended");
      return true;
    }

    try {
      mRemote.setBitrate(bps);
    } catch (final RemoteException e) {
      Log.e(LOGTAG, "remote fail to set rates:" + bps);
      e.printStackTrace();
    }
    return true;
  }

  @WrapForJNI
  public synchronized boolean releaseOutput(final Sample sample, final boolean render) {
    if (mOutputSurface != null) {
      if (!mSurfaceOutputs.remove(sample)) {
        if (mRemote != null) Log.w(LOGTAG, "already released: " + sample);
        return true;
      }

      if (DEBUG && !render) {
        Log.d(LOGTAG, "drop output:" + sample.info.presentationTimeUs);
      }
    }

    if (mRemote == null) {
      Log.w(LOGTAG, "codec already ended");
      sample.dispose();
      return true;
    }

    try {
      mRemote.releaseOutput(sample, render);
    } catch (final RemoteException e) {
      Log.e(LOGTAG, "remote fail to release output:" + sample.info.presentationTimeUs);
      e.printStackTrace();
    }
    sample.dispose();

    return true;
  }

  /* package */ void reportError(final boolean fatal) {
    mCallbacks.reportError(fatal);
  }

  private synchronized SampleBuffer getOutputBuffer(final int id) {
    if (mRemote == null) {
      Log.e(LOGTAG, "cannot get buffer#" + id + " from an ended codec");
      return null;
    }

    if (mOutputSurface != null || id == Sample.NO_BUFFER) {
      return null;
    }

    SampleBuffer buffer = mOutputBuffers.get(id);
    if (buffer != null) {
      return buffer;
    }

    try {
      buffer = mRemote.getOutputBuffer(id);
    } catch (final Exception e) {
      Log.e(LOGTAG, "cannot get buffer#" + id, e);
      return null;
    }
    if (buffer != null) {
      mOutputBuffers.put(id, buffer);
    }

    return buffer;
  }

  @WrapForJNI
  public static boolean supportsCBCS() {
    // Android N/API-24 supports CBCS but there seems to be a bug.
    // See https://github.com/google/ExoPlayer/issues/4022
    return Build.VERSION.SDK_INT >= Build.VERSION_CODES.N_MR1;
  }

  @RequiresApi(api = Build.VERSION_CODES.N_MR1)
  @WrapForJNI
  public static boolean setCryptoPatternIfNeeded(
      final CryptoInfo info, final int blocksToEncrypt, final int blocksToSkip) {
    if (supportsCBCS() && (blocksToEncrypt > 0 || blocksToSkip > 0)) {
      info.setPattern(new CryptoInfo.Pattern(blocksToEncrypt, blocksToSkip));
      return true;
    }
    return false;
  }
}