/*
 * Copyright (C) 2006 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.media;

import android.content.ContentResolver;
import android.content.Context;
import android.content.res.AssetFileDescriptor;
import android.database.Cursor;
import android.media.AudioManager;
import android.media.MediaPlayer;
import android.net.Uri;
import android.provider.DrmStore;
import android.provider.MediaStore;
import android.provider.Settings;
import android.util.Log;

import java.io.FileDescriptor;
import java.io.IOException;

/**
 * Ringtone provides a quick method for playing a ringtone, notification, or
 * other similar types of sounds.
 * <p>
 * For ways of retrieving {@link Ringtone} objects or to show a ringtone
 * picker, see {@link RingtoneManager}.
 * 
 * @see RingtoneManager
 */
public class Ringtone {
    private static String TAG = "Ringtone";

    private static final String[] MEDIA_COLUMNS = new String[] {
        MediaStore.Audio.Media._ID,
        MediaStore.Audio.Media.DATA,
        MediaStore.Audio.Media.TITLE
    };

    private static final String[] DRM_COLUMNS = new String[] {
        DrmStore.Audio._ID,
        DrmStore.Audio.DATA,
        DrmStore.Audio.TITLE
    };

    private MediaPlayer mAudio;

    private Uri mUri;
    private String mTitle;
    private FileDescriptor mFileDescriptor;
    private AssetFileDescriptor mAssetFileDescriptor;

    private int mStreamType = AudioManager.STREAM_RING;
    private AudioManager mAudioManager;

    private Context mContext;

    Ringtone(Context context) {
        mContext = context;
        mAudioManager = (AudioManager) mContext.getSystemService(Context.AUDIO_SERVICE);
    }

    /**
     * Sets the stream type where this ringtone will be played.
     * 
     * @param streamType The stream, see {@link AudioManager}.
     */
    public void setStreamType(int streamType) {
        mStreamType = streamType;
        
        if (mAudio != null) {
            /*
             * The stream type has to be set before the media player is
             * prepared. Re-initialize it.
             */
            try {
                openMediaPlayer();
            } catch (IOException e) {
                Log.w(TAG, "Couldn't set the stream type", e);
            }
        }
    }

    /**
     * Gets the stream type where this ringtone will be played.
     * 
     * @return The stream type, see {@link AudioManager}.
     */
    public int getStreamType() {
        return mStreamType;
    }

    /**
     * Returns a human-presentable title for ringtone. Looks in media and DRM
     * content providers. If not in either, uses the filename
     * 
     * @param context A context used for querying. 
     */
    public String getTitle(Context context) {
        if (mTitle != null) return mTitle;
        return mTitle = getTitle(context, mUri, true);
    }

    private static String getTitle(Context context, Uri uri, boolean followSettingsUri) {
        Cursor cursor = null;
        ContentResolver res = context.getContentResolver();
        
        String title = null;

        if (uri != null) {
            String authority = uri.getAuthority();

            if (Settings.AUTHORITY.equals(authority)) {
                if (followSettingsUri) {
                    Uri actualUri = RingtoneManager.getActualDefaultRingtoneUri(context,
                            RingtoneManager.getDefaultType(uri));
                    String actualTitle = getTitle(context, actualUri, false);
                    title = context
                            .getString(com.android.internal.R.string.ringtone_default_with_actual,
                                    actualTitle);
                }
            } else {
                
                if (DrmStore.AUTHORITY.equals(authority)) {
                    cursor = res.query(uri, DRM_COLUMNS, null, null, null);
                } else if (MediaStore.AUTHORITY.equals(authority)) {
                    cursor = res.query(uri, MEDIA_COLUMNS, null, null, null);
                }
                
                if (cursor != null && cursor.getCount() == 1) {
                    cursor.moveToFirst();
                    return cursor.getString(2);
                } else {
                    title = uri.getLastPathSegment();
                }
            }
        }

        if (title == null) {
            title = context.getString(com.android.internal.R.string.ringtone_unknown);
            
            if (title == null) {
                title = "";
            }
        }
        
        return title;
    }
    
    private void openMediaPlayer() throws IOException {
        mAudio = new MediaPlayer();
        if (mUri != null) {
            mAudio.setDataSource(mContext, mUri);
        } else if (mFileDescriptor != null) {
            mAudio.setDataSource(mFileDescriptor);
        } else if (mAssetFileDescriptor != null) {
            // Note: using getDeclaredLength so that our behavior is the same
            // as previous versions when the content provider is returning
            // a full file.
            if (mAssetFileDescriptor.getDeclaredLength() < 0) {
                mAudio.setDataSource(mAssetFileDescriptor.getFileDescriptor());
            } else {
                mAudio.setDataSource(mAssetFileDescriptor.getFileDescriptor(),
                        mAssetFileDescriptor.getStartOffset(),
                        mAssetFileDescriptor.getDeclaredLength());
            }
        } else {
            throw new IOException("No data source set.");
        }
        mAudio.setAudioStreamType(mStreamType);
        mAudio.prepare();
    }

    void open(FileDescriptor fd) throws IOException {
        mFileDescriptor = fd;
        openMediaPlayer();
    }

    void open(AssetFileDescriptor fd) throws IOException {
        mAssetFileDescriptor = fd;
        openMediaPlayer();
    }

    void open(Uri uri) throws IOException {
        mUri = uri;
        openMediaPlayer();
    }
    
    /**
     * Plays the ringtone.
     */
    public void play() {
        if (mAudio == null) {
            try {
                openMediaPlayer();
            } catch (Exception ex) {
                Log.e(TAG, "play() caught ", ex);
                mAudio = null;
            }
        }
        if (mAudio != null) {
            // do not ringtones if stream volume is 0
            // (typically because ringer mode is silent).
            if (mAudioManager.getStreamVolume(mStreamType) != 0) {
                mAudio.start();
            }
        }
    }

    /**
     * Stops a playing ringtone.
     */
    public void stop() {
        if (mAudio != null) {
            mAudio.reset();
            mAudio.release();
            mAudio = null;
        }
    }

    /**
     * Whether this ringtone is currently playing.
     * 
     * @return True if playing, false otherwise.
     */
    public boolean isPlaying() {
        return mAudio != null && mAudio.isPlaying();
    }

    void setTitle(String title) {
        mTitle = title;
    }
}
