package com.example.mytest.ui.launch;

import android.content.Context;
import android.media.AudioAttributes;
import android.media.AudioFocusRequest;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.Build;
import android.util.AttributeSet;
import android.util.Log;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.MediaController;

import androidx.annotation.NonNull;

import java.io.IOException;
import java.util.Map;

/**
 * 啟動(dòng)頁視頻播放器
 */
public class LauncherMediaPlayer extends SurfaceView implements MediaController.MediaPlayerControl {
    private static final String TAG = "LauncherMediaPlayer";
    private static final int STATE_ERROR = -1;
    private static final int STATE_IDLE = 0;
    private static final int STATE_PREPARING = 1;
    private static final int STATE_PREPARED = 2;
    private static final int STATE_PLAYING = 3;
    private static final int STATE_PAUSED = 4;
    private static final int STATE_PLAYBACK_COMPLETED = 5;
    private final Context mContext;
    private final AudioManager mAudioManager;
    private int mVideoWidth, mVideoHeight, mSurfaceWidth, mSurfaceHeight;
    private int mAudioFocusType = AudioManager.AUDIOFOCUS_NONE;
    private MediaPlayer mMediaPlayer;
    private SurfaceHolder mSurfaceHolder;
    private MediaController mMediaController;
    private AudioAttributes mAudioAttributes;
    private Uri mUri;
    private int mCurrentState = STATE_IDLE;
    private int mTargetState = STATE_IDLE;
    private int mCurrentBufferPercentage;
    private int mSeekWhenPrepared;

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

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

    public LauncherMediaPlayer(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        mContext = context;
        mVideoWidth = 0;
        mVideoHeight = 0;

        mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
        mAudioAttributes = new AudioAttributes.Builder().setUsage(AudioAttributes.USAGE_MEDIA)
                .setContentType(AudioAttributes.CONTENT_TYPE_MOVIE).build();

        getHolder().addCallback(mSHCallback);
        getHolder().setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);

        setFocusable(true);
        setFocusableInTouchMode(true);
        requestFocus();

        mCurrentState = STATE_IDLE;
        mTargetState = STATE_IDLE;
    }

    public void resume() {
        openVideo();
    }

    public void setVideoPath(String path) {
        setVideoURI(Uri.parse(path));
    }

    public void setVideoURI(Uri uri) {
        setVideoURI(uri, null);
    }

    public void setVideoURI(Uri uri, Map<String, String> headers) {
        mUri = uri;
        mSeekWhenPrepared = 0;
        openVideo();
        requestLayout();
        invalidate();
    }

    private void openVideo() {
        if (mUri == null || mSurfaceHolder == null) {
            // not ready for playback just yet, will try again later
            return;
        }
        // we shouldn't clear the target state, because somebody might have
        // called start() previously
        release(false);

        if (mAudioFocusType != AudioManager.AUDIOFOCUS_NONE) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                AudioFocusRequest request = new AudioFocusRequest.Builder(mAudioFocusType).build();
                mAudioManager.requestAudioFocus(request);
            } else {
                mAudioManager.requestAudioFocus(null, mAudioFocusType, 0 /*flags*/);
            }
        }

        try {
            MediaPlayer tmpMp = mMediaPlayer = new MediaPlayer();
            final Context context = getContext();
            if (mAudioSession != 0) {
                tmpMp.setAudioSessionId(mAudioSession);
            } else {
                mAudioSession = tmpMp.getAudioSessionId();
            }
            tmpMp.setOnPreparedListener(mPreparedListener);
            tmpMp.setOnVideoSizeChangedListener(mSizeChangedListener);
            tmpMp.setOnCompletionListener(mCompletionListener);
            tmpMp.setOnErrorListener(mErrorListener);
            // tmpMp.setOnInfoListener(mInfoListener);
            tmpMp.setOnBufferingUpdateListener(mBufferingUpdateListener);
            mCurrentBufferPercentage = 0;
            tmpMp.setDataSource(mContext, mUri);
            tmpMp.setDisplay(mSurfaceHolder);
            tmpMp.setAudioAttributes(mAudioAttributes);
//            tmpMp.setVolume(0f, 0f);
            tmpMp.setScreenOnWhilePlaying(true);
            tmpMp.prepareAsync();

            // we don't set the target state here either, but preserve the
            // target state that was there before.
            mCurrentState = STATE_PREPARING;
            attachMediaController();
        } catch (IOException ex) {
            Log.w(TAG, "Unable to open content: " + mUri, ex);
            mCurrentState = STATE_ERROR;
            mTargetState = STATE_ERROR;
            mErrorListener.onError(mMediaPlayer, MediaPlayer.MEDIA_ERROR_UNKNOWN, 0);
            return;
        } catch (IllegalArgumentException ex) {
            Log.w(TAG, "Unable to open content: " + mUri, ex);
            mCurrentState = STATE_ERROR;
            mTargetState = STATE_ERROR;
            mErrorListener.onError(mMediaPlayer, MediaPlayer.MEDIA_ERROR_UNKNOWN, 0);
            return;
        }
    }

    private void attachMediaController() {
        if (mMediaPlayer != null && mMediaController != null) {
            mMediaController.setMediaPlayer(this);
            View anchorView = this.getParent() instanceof View ?
                    (View) this.getParent() : this;
            mMediaController.setAnchorView(anchorView);
            mMediaController.setEnabled(isInPlaybackState());
        }
    }

    @Override
    public boolean isPlaying() {
        return isInPlaybackState() && mMediaPlayer.isPlaying();
    }

    private boolean isInPlaybackState() {
        return (mMediaPlayer != null &&
                mCurrentState != STATE_ERROR &&
                mCurrentState != STATE_IDLE &&
                mCurrentState != STATE_PREPARING);
    }

    @Override
    public void start() {
        if (isInPlaybackState()) {
            mMediaPlayer.start();
            mCurrentState = STATE_PLAYING;
        }
        mTargetState = STATE_PLAYING;
    }

    @Override
    public void pause() {
        if (isInPlaybackState()) {
            if (mMediaPlayer.isPlaying()) {
                mMediaPlayer.pause();
                mCurrentState = STATE_PAUSED;
            }
        }
        mTargetState = STATE_PAUSED;
    }

    private void release(boolean clearTargetState) {
        if (mMediaPlayer != null) {
            mMediaPlayer.reset();
            mMediaPlayer.release();
            mMediaPlayer = null;
            mCurrentState = STATE_IDLE;
            if (clearTargetState) {
                mTargetState = STATE_IDLE;
            }
            if (mAudioFocusType != AudioManager.AUDIOFOCUS_NONE) {
                mAudioManager.abandonAudioFocus(null);
            }
        }
    }

    private SurfaceHolder.Callback mSHCallback = new SurfaceHolder.Callback() {
        public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) {
            mSurfaceWidth = w;
            mSurfaceHeight = h;
            boolean isValidState = (mTargetState == STATE_PLAYING);
            boolean hasValidSize = (mVideoWidth == w && mVideoHeight == h);
            if (mMediaPlayer != null && isValidState && hasValidSize) {
                if (mSeekWhenPrepared != 0) {
                    seekTo(mSeekWhenPrepared);
                }
                start();
            }
        }

        public void surfaceCreated(SurfaceHolder holder) {
            mSurfaceHolder = holder;
            openVideo();
        }

        public void surfaceDestroyed(SurfaceHolder holder) {
            // after we return from this we can't use the surface any more
            mSurfaceHolder = null;
            if (mMediaController != null) mMediaController.hide();
            release(true);
        }
    };

    private final MediaPlayer.OnBufferingUpdateListener mBufferingUpdateListener =
            new MediaPlayer.OnBufferingUpdateListener() {
                public void onBufferingUpdate(MediaPlayer mp, int percent) {
                    mCurrentBufferPercentage = percent;
                }
            };
    private final MediaPlayer.OnPreparedListener mPreparedListener = new MediaPlayer.OnPreparedListener() {
        public void onPrepared(MediaPlayer mp) {
            mCurrentState = STATE_PREPARED;
            if (mListener != null) {
                mListener.onPrepared(mMediaPlayer);
            }
            float videoRatio = mp.getVideoWidth() / (float) mp.getVideoHeight();
            float screenRatio = mSurfaceWidth / (float) mSurfaceHeight;
            float scaleX = videoRatio / screenRatio;
            if (scaleX >= 1f) {
                setScaleX(scaleX);
            } else {
                setScaleY(1f / scaleX);
            }
            if (mMediaController != null) {
                mMediaController.setEnabled(true);
            }
            mVideoWidth = mp.getVideoWidth();
            mVideoHeight = mp.getVideoHeight();

            int seekToPosition = mSeekWhenPrepared;  // mSeekWhenPrepared may be changed after seekTo() call
            if (seekToPosition != 0) {
                seekTo(seekToPosition);
            }
            if (mVideoWidth != 0 && mVideoHeight != 0) {
                Log.i(TAG, "video size: " + mVideoWidth + "/" + mVideoHeight);
                getHolder().setFixedSize(mVideoWidth, mVideoHeight);
                if (mSurfaceWidth == mVideoWidth && mSurfaceHeight == mVideoHeight) {
                    // We didn't actually change the size (it was already at the size
                    // we need), so we won't get a "surface changed" callback, so
                    // start the video here instead of in the callback.
                    if (mTargetState == STATE_PLAYING) {
                        start();
                        if (mMediaController != null) {
                            mMediaController.show();
                        }
                    } else if (!isPlaying() &&
                            (seekToPosition != 0 || getCurrentPosition() > 0)) {
                        if (mMediaController != null) {
                            // Show the media controls when we're paused into a video and make 'em stick.
                            mMediaController.show(0);
                        }
                    }
                }
            } else {
                // We don't know the video size yet, but should start anyway.
                // The video size might be reported to us later.
                if (mTargetState == STATE_PLAYING) {
                    start();
                }
            }
        }
    };

    private final MediaPlayer.OnVideoSizeChangedListener mSizeChangedListener =
            new MediaPlayer.OnVideoSizeChangedListener() {
                public void onVideoSizeChanged(MediaPlayer mp, int width, int height) {
                    mVideoWidth = mp.getVideoWidth();
                    mVideoHeight = mp.getVideoHeight();
                    if (mVideoWidth != 0 && mVideoHeight != 0) {
                        getHolder().setFixedSize(mVideoWidth, mVideoHeight);
                        requestLayout();
                    }
                }
            };
    private final MediaPlayer.OnCompletionListener mCompletionListener =
            new MediaPlayer.OnCompletionListener() {
                public void onCompletion(MediaPlayer mp) {
                    mCurrentState = STATE_PLAYBACK_COMPLETED;
                    mTargetState = STATE_PLAYBACK_COMPLETED;
                    if (mMediaController != null) {
                        mMediaController.hide();
                    }
                    if (mListener != null) {
                        mListener.onCompletion(mMediaPlayer);
                    }
                    if (mAudioFocusType != AudioManager.AUDIOFOCUS_NONE) {
                        mAudioManager.abandonAudioFocus(null);
                    }
                }
            };
    private final MediaPlayer.OnErrorListener mErrorListener =
            new MediaPlayer.OnErrorListener() {
                public boolean onError(MediaPlayer mp, int framework_err, int impl_err) {
                    Log.d(TAG, "Error: " + framework_err + "," + impl_err);
                    mCurrentState = STATE_ERROR;
                    mTargetState = STATE_ERROR;
                    if (mMediaController != null) {
                        mMediaController.hide();
                    }

                    /* If an error handler has been supplied, use it and finish. */
                    if (mListener != null) {
                        if (mListener.onError(mMediaPlayer, framework_err, impl_err)) {
                            return true;
                        }
                    }
                    return true;
                }
            };

    public void setAudioFocusRequest(int focusGain) {
        if (focusGain != AudioManager.AUDIOFOCUS_NONE
                && focusGain != AudioManager.AUDIOFOCUS_GAIN
                && focusGain != AudioManager.AUDIOFOCUS_GAIN_TRANSIENT
                && focusGain != AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_MAY_DUCK
                && focusGain != AudioManager.AUDIOFOCUS_GAIN_TRANSIENT_EXCLUSIVE) {
            throw new IllegalArgumentException("Illegal audio focus type " + focusGain);
        }
        mAudioFocusType = focusGain;
    }

    @Override
    public int getDuration() {
        if (isInPlaybackState()) {
            return mMediaPlayer.getDuration();
        }
        return -1;
    }

    @Override
    public int getCurrentPosition() {
        if (isInPlaybackState()) {
            return mMediaPlayer.getCurrentPosition();
        }
        return 0;
    }

    @Override
    public void seekTo(int msec) {
        if (isInPlaybackState()) {
            mMediaPlayer.seekTo(msec);
            mSeekWhenPrepared = 0;
        } else {
            mSeekWhenPrepared = msec;
        }
    }

    @Override
    public int getBufferPercentage() {
        return mCurrentBufferPercentage;
    }

    @Override
    public boolean canPause() {
        return false;
    }

    @Override
    public boolean canSeekBackward() {
        return false;
    }

    @Override
    public boolean canSeekForward() {
        return false;
    }

    private int mAudioSession;

    @Override
    public int getAudioSessionId() {
        if (mAudioSession == 0) {
            MediaPlayer foo = new MediaPlayer();
            mAudioSession = foo.getAudioSessionId();
            foo.release();
        }
        return mAudioSession;
    }


    private PlayListener mListener;

    public void setPlayListener(PlayListener l) {
        mListener = l;
    }

    public interface PlayListener {

        void onPrepared(@NonNull MediaPlayer player);

        boolean onError(@NonNull MediaPlayer player, int frameworkErr, int implErr);

        void onCompletion(@NonNull MediaPlayer player);
    }
}