/***
 * The MIT License (MIT)
 * <p/>
 * Copyright (c) 2014 Jaydeep
 * <p/>
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 * <p/>
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 * <p/>
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

package nl.changer.audiowife;

import android.content.Context;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.net.Uri;
import android.os.Handler;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.SeekBar;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.concurrent.TimeUnit;

/***
 * A simple audio player wrapper for Android
 ***/
public class AudioWife {

    private static final String TAG = AudioWife.class.getSimpleName();
    /****
     * Playback progress update time in milliseconds
     ****/
    private static final int AUDIO_PROGRESS_UPDATE_TIME = 100;
    // TODO: externalize the error messages.
    private static final String ERROR_PLAYVIEW_NULL = "Play view cannot be null";
    private static final String ERROR_PLAYTIME_CURRENT_NEGATIVE = "Current playback time cannot be negative";
    private static final String ERROR_PLAYTIME_TOTAL_NEGATIVE = "Total playback time cannot be negative";
    /***
     * Keep a single copy of this in memory unless required to create a new instance explicitly.
     ****/
    private static AudioWife mAudioWife;
    /***
     * Audio URI
     ****/
    private static Uri mUri;
    private Handler mProgressUpdateHandler;
    private MediaPlayer mMediaPlayer;
    private SeekBar mSeekBar;
    @Deprecated
    /***
     * Set both current playack time and total runtime
     * of the audio in the UI.
     */
    private TextView mPlaybackTime;
    private View mPlayButton;
    private View mPauseButton;
    /***
     * Indicates the current run-time of the audio being played
     */
    private TextView mRunTime;
    /***
     * Indicates the total duration of the audio being played.
     */
    private TextView mTotalTime;
    /***
     * Set if AudioWife is using the default UI provided with the library.
     **/
    private boolean mHasDefaultUi;
    /****
     * Array to hold custom completion listeners
     ****/
    private ArrayList<OnCompletionListener> mCompletionListeners = new ArrayList<OnCompletionListener>();
    private ArrayList<View.OnClickListener> mPlayListeners = new ArrayList<View.OnClickListener>();
    private ArrayList<View.OnClickListener> mPauseListeners = new ArrayList<View.OnClickListener>();
    private Runnable mUpdateProgress = new Runnable() {

        public void run() {

            if (mSeekBar == null) {
                return;
            }

            if (mProgressUpdateHandler != null && mMediaPlayer.isPlaying()) {
                mSeekBar.setProgress((int) mMediaPlayer.getCurrentPosition());
                int currentTime = mMediaPlayer.getCurrentPosition();
                updatePlaytime(currentTime);
                updateRuntime(currentTime);
                // repeat the process
                mProgressUpdateHandler.postDelayed(this, AUDIO_PROGRESS_UPDATE_TIME);
            } else {
                // DO NOT update UI if the player is paused
            }
        }
    };
    private OnCompletionListener mOnCompletion = new OnCompletionListener() {

        @Override
        public void onCompletion(MediaPlayer mp) {
            // set UI when audio finished playing
            int currentPlayTime = 0;
            mSeekBar.setProgress((int) currentPlayTime);
            updatePlaytime(currentPlayTime);
            updateRuntime(currentPlayTime);
            setPlayable();
            // ensure that our completion listener fires first.
            // This will provide the developer to over-ride our
            // completion listener functionality

            fireCustomCompletionListeners(mp);
        }
    };
    private View playerUi;

    public static AudioWife getInstance() {

        if (mAudioWife == null) {
            mAudioWife = new AudioWife();
        }

        return mAudioWife;
    }

    /***
     * Starts playing audio file associated. Before playing the audio, visibility of appropriate UI
     * controls is made visible. Calling this method has no effect if the audio is already being
     * played.
     ****/
    public void play() {

        // if play button itself is null, the whole purpose of AudioWife is
        // defeated.
        if (mPlayButton == null) {
            throw new IllegalStateException(ERROR_PLAYVIEW_NULL);
        }

        if (mUri == null) {
            throw new IllegalStateException("Uri cannot be null. Call init() before calling this method");
        }

        if (mMediaPlayer == null) {
            throw new IllegalStateException("Call init() before calling this method");
        }

        if (mMediaPlayer.isPlaying()) {
            return;
        }

        mProgressUpdateHandler.postDelayed(mUpdateProgress, AUDIO_PROGRESS_UPDATE_TIME);

        // enable visibility of all UI controls.
        setViewsVisibility();

        mMediaPlayer.start();

        setPausable();
    }

    /**
     * Ensure the views are visible before playing the audio.
     */
    private void setViewsVisibility() {

        if (mSeekBar != null) {
            mSeekBar.setVisibility(View.VISIBLE);
        }

        if (mPlaybackTime != null) {
            mPlaybackTime.setVisibility(View.VISIBLE);
        }

        if (mRunTime != null) {
            mRunTime.setVisibility(View.VISIBLE);
        }

        if (mTotalTime != null) {
            mTotalTime.setVisibility(View.VISIBLE);
        }

        if (mPlayButton != null) {
            mPlayButton.setVisibility(View.VISIBLE);
        }

        if (mPauseButton != null) {
            mPauseButton.setVisibility(View.VISIBLE);
        }
    }

    /***
     * Pause the audio being played. Calling this method has no effect if the audio is already
     * paused
     */
    public void pause() {

        if (mMediaPlayer == null) {
            return;
        }

        if (mMediaPlayer.isPlaying()) {
            mMediaPlayer.pause();
            setPlayable();
        }
    }

    @Deprecated
    private void updatePlaytime(int currentTime) {

        if (mPlaybackTime == null) {
            return;
        }

        if (currentTime < 0) {
            throw new IllegalArgumentException(ERROR_PLAYTIME_CURRENT_NEGATIVE);
        }

        StringBuilder playbackStr = new StringBuilder();

        // set the current time
        // its ok to show 00:00 in the UI
        playbackStr.append(String.format("%02d:%02d", TimeUnit.MILLISECONDS.toMinutes((long) currentTime), TimeUnit.MILLISECONDS.toSeconds((long) currentTime) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes((long) currentTime))));

        playbackStr.append("/");

        // show total duration.
        long totalDuration = 0;

        if (mMediaPlayer != null) {
            try {
                totalDuration = mMediaPlayer.getDuration();
            } catch (IllegalStateException e) {
                //e.printStackTrace();
            } catch (Exception e) {
                //e.printStackTrace();
            }
        }

        // set total time as the audio is being played
        if (totalDuration != 0) {
            playbackStr.append(String.format("%02d:%02d", TimeUnit.MILLISECONDS.toMinutes((long) totalDuration), TimeUnit.MILLISECONDS.toSeconds((long) totalDuration) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes((long) totalDuration))));
        } else {
            Log.w(TAG, "Something strage this audio track duration in zero");
        }

        mPlaybackTime.setText(playbackStr);

        // DebugLog.i(currentTime + " / " + totalDuration);
    }

    private void updateRuntime(int currentTime) {

        if (mRunTime == null) {
            // this view can be null if the user
            // does not want to use it. Don't throw
            // an exception.
            return;
        }

        if (currentTime < 0) {
            throw new IllegalArgumentException(ERROR_PLAYTIME_CURRENT_NEGATIVE);
        }

        StringBuilder playbackStr = new StringBuilder();

        // set the current time
        // its ok to show 00:00 in the UI
        playbackStr.append(String.format("%02d:%02d", TimeUnit.MILLISECONDS.toMinutes((long) currentTime), TimeUnit.MILLISECONDS.toSeconds((long) currentTime) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes((long) currentTime))));

        mRunTime.setText(playbackStr);

        // DebugLog.i(currentTime + " / " + totalDuration);
    }

    private void setTotalTime() {

        if (mTotalTime == null) {
            // this view can be null if the user
            // does not want to use it. Don't throw
            // an exception.
            return;
        }

        StringBuilder playbackStr = new StringBuilder();
        long totalDuration = 0;

        // by this point the media player is brought to ready state
        // by the call to init().
        if (mMediaPlayer != null) {
            try {
                totalDuration = mMediaPlayer.getDuration();
            } catch (IllegalStateException e) {
                e.printStackTrace();
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        if (totalDuration < 0) {
            throw new IllegalArgumentException(ERROR_PLAYTIME_TOTAL_NEGATIVE);
        }

        // set total time as the audio is being played
        if (totalDuration != 0) {
            playbackStr.append(String.format("%02d:%02d", TimeUnit.MILLISECONDS.toMinutes((long) totalDuration), TimeUnit.MILLISECONDS.toSeconds((long) totalDuration) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes((long) totalDuration))));
        }

        mTotalTime.setText(playbackStr);
    }

    /***
     * Changes audiowife state to enable play functionality.
     */
    private void setPlayable() {
        if (mPlayButton != null) {
            mPlayButton.setVisibility(View.VISIBLE);
        }

        if (mPauseButton != null) {
            mPauseButton.setVisibility(View.GONE);
        }
    }

    /****
     * Changes audio wife to enable pause functionality.
     */
    private void setPausable() {
        if (mPlayButton != null) {
            mPlayButton.setVisibility(View.GONE);
        }

        if (mPauseButton != null) {
            mPauseButton.setVisibility(View.VISIBLE);
        }
    }

    /***
     * Initialize the audio player. This method should be the first one to be called before starting
     * to play audio using {@link nl.changer.audiowife.AudioWife}
     *
     * @param ctx {@link android.app.Activity} Context
     * @param uri Uri of the audio to be played.
     ****/
    public AudioWife init(Context ctx, Uri uri) {

        if (uri == null) {
            throw new IllegalArgumentException("Uri cannot be null");
        }

        if (mAudioWife == null) {
            mAudioWife = new AudioWife();
        }

        mUri = uri;

        mProgressUpdateHandler = new Handler();

        initPlayer(ctx);

        return this;
    }

    /***
     * Sets the audio play functionality on click event of this view. You can set {@link android.widget.Button} or
     * an {@link android.widget.ImageView} as audio play control
     *
     * @see nl.changer.audiowife.AudioWife#addOnPauseClickListener(android.view.View.OnClickListener)
     ****/
    public AudioWife setPlayView(View play) {

        if (play == null) {
            throw new NullPointerException("PlayView cannot be null");
        }

        if (mHasDefaultUi) {
            Log.w(TAG, "Already using default UI. Setting play view will have no effect");
            return this;
        }

        mPlayButton = play;

        initOnPlayClick();
        return this;
    }

    private void initOnPlayClick() {
        if (mPlayButton == null) {
            throw new NullPointerException(ERROR_PLAYVIEW_NULL);
        }

        // add default click listener to the top
        // so that it is the one that gets fired first
        mPlayListeners.add(0, new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                play();
            }
        });

        // Fire all the attached listeners
        // when the play button is clicked
        mPlayButton.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                for (View.OnClickListener listener : mPlayListeners) {
                    listener.onClick(v);
                }
            }
        });
    }

    /***
     * Sets the audio pause functionality on click event of the view passed in as a parameter. You
     * can set {@link android.widget.Button} or an {@link android.widget.ImageView} as audio pause control. Audio pause
     * functionality will be unavailable if this method is not called.
     *
     * @see nl.changer.audiowife.AudioWife#addOnPauseClickListener(android.view.View.OnClickListener)
     ****/
    public AudioWife setPauseView(View pause) {

        if (pause == null) {
            throw new NullPointerException("PauseView cannot be null");
        }

        if (mHasDefaultUi) {
            Log.w(TAG, "Already using default UI. Setting pause view will have no effect");
            return this;
        }

        mPauseButton = pause;

        initOnPauseClick();
        return this;
    }

    private void initOnPauseClick() {
        if (mPauseButton == null) {
            throw new NullPointerException("Pause view cannot be null");
        }

        // add default click listener to the top
        // so that it is the one that gets fired first
        mPauseListeners.add(0, new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                pause();
            }
        });

        // Fire all the attached listeners
        // when the pause button is clicked
        mPauseButton.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(View v) {
                for (View.OnClickListener listener : mPauseListeners) {
                    listener.onClick(v);
                }
            }
        });
    }

    /***
     * @deprecated Use {@link nl.changer.audiowife.AudioWife#setRuntimeView(android.widget.TextView)} and
     * {@link nl.changer.audiowife.AudioWife#setTotalTimeView(android.widget.TextView)} instead. <br/>
     * Sets current and total playback time. Use this if you have a playback time
     * counter in the UI.
     ****/
    public AudioWife setPlaytime(TextView playTime) {

        if (mHasDefaultUi) {
            Log.w(TAG, "Already using default UI. Setting play time will have no effect");
            return this;
        }

        mPlaybackTime = playTime;

        // initialize the playtime to 0
        updatePlaytime(0);
        return this;
    }

    /***
     * Sets current playback time view. Use this if you have a playback time counter in the UI.
     *
     * @see nl.changer.audiowife.AudioWife#setTotalTimeView(android.widget.TextView)
     ****/
    public AudioWife setRuntimeView(TextView currentTime) {

        if (mHasDefaultUi) {
            Log.w(TAG, "Already using default UI. Setting play time will have no effect");
            return this;
        }

        mRunTime = currentTime;

        // initialize the playtime to 0
        updateRuntime(0);
        return this;
    }

    /***
     * Sets the total playback time view. Use this if you have a playback time counter in the UI.
     *
     * @see nl.changer.audiowife.AudioWife#setRuntimeView(android.widget.TextView)
     ****/
    public AudioWife setTotalTimeView(TextView totalTime) {

        if (mHasDefaultUi) {
            Log.w(TAG, "Already using default UI. Setting play time will have no effect");
            return this;
        }

        mTotalTime = totalTime;

        setTotalTime();
        return this;
    }

    public AudioWife setSeekBar(SeekBar seekbar) {

        if (mHasDefaultUi) {
            Log.w(TAG, "Already using default UI. Setting seek bar will have no effect");
            return this;
        }

        mSeekBar = seekbar;
        initMediaSeekBar();
        return this;
    }

    /****
     * Add custom playback completion listener. Adding multiple listeners will queue up all the
     * listeners and fire them on media playback completes.
     */
    public AudioWife addOnCompletionListener(OnCompletionListener listener) {

        // add default click listener to the top
        // so that it is the one that gets fired first
        mCompletionListeners.add(0, listener);

        return this;
    }

    /****
     * Add custom play view click listener. Calling this method multiple times will queue up all the
     * listeners and fire them all together when the event occurs.
     ***/
    public AudioWife addOnPlayClickListener(View.OnClickListener listener) {

        mPlayListeners.add(listener);

        return this;
    }

    /***
     * Add custom pause view click listener. Calling this method multiple times will queue up all
     * the listeners and fire them all together when the event occurs.
     ***/
    public AudioWife addOnPauseClickListener(View.OnClickListener listener) {

        mPauseListeners.add(listener);

        return this;
    }

    /****
     * Initialize and prepare the audio player
     ****/
    private void initPlayer(Context ctx) {

        mMediaPlayer = new MediaPlayer();
        mMediaPlayer.setAudioStreamType(AudioManager.STREAM_MUSIC);

        try {
            mMediaPlayer.setDataSource(ctx, mUri);
        } catch (Exception ignored) {
        }

        try {
            mMediaPlayer.prepare();
        } catch (Exception ignored) {
        }

        mMediaPlayer.setOnCompletionListener(mOnCompletion);
    }

    private void initMediaSeekBar() {

        if (mSeekBar == null) {
            return;
        }

        // update seekbar
        long finalTime = mMediaPlayer.getDuration();
        mSeekBar.setMax((int) finalTime);

        mSeekBar.setProgress(0);

        mSeekBar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {

            @Override
            public void onStopTrackingTouch(SeekBar seekBar) {
                mMediaPlayer.seekTo(seekBar.getProgress());

                // if the audio is paused and seekbar is moved,
                // update the play time in the UI.
                updateRuntime(seekBar.getProgress());
            }

            @Override
            public void onStartTrackingTouch(SeekBar seekBar) {

            }

            @Override
            public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {

            }
        });
    }

    private void fireCustomCompletionListeners(MediaPlayer mp) {
        for (OnCompletionListener listener : mCompletionListeners) {
            listener.onCompletion(mp);
        }
    }

    public void cleanPlayerUi() {
        ((ViewGroup) playerUi.getParent()).removeView(playerUi);
    }

    public View getPlayerUi() {
        return playerUi;
    }

    public AudioWife useDefaultUi(ViewGroup playerContainer, LayoutInflater inflater) {
        if (playerContainer == null) {
            throw new NullPointerException("Player container cannot be null");
        }

        if (inflater == null) {
            throw new IllegalArgumentException("Inflater cannot be null");
        }

        playerUi = inflater.inflate(R.layout.aw_player, playerContainer, false); // IMPORTANT, sonst geht meine Lösung nicht xD

        // init play view
        View playView = playerUi.findViewById(R.id.play);
        setPlayView(playView);

        // init pause view
        View pauseView = playerUi.findViewById(R.id.pause);
        setPauseView(pauseView);

        // init seekbar
        SeekBar seekBar = (SeekBar) playerUi.findViewById(R.id.media_seekbar);
        setSeekBar(seekBar);

        // init playback time view
        TextView playbackTime = (TextView) playerUi.findViewById(R.id.playback_time);
        setPlaytime(playbackTime);

        // this has to be set after all the views
        // have finished initializing.
        mHasDefaultUi = true;
        return this;
    }

    public void release() {

        if (mMediaPlayer != null) {
            mMediaPlayer.stop();
            mMediaPlayer.reset();
            mMediaPlayer.release();
            mMediaPlayer = null;
            mProgressUpdateHandler = null;
        }
    }
}