/*
 * Copyright (C) 2014 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 com.android.settings.notification;

import android.content.BroadcastReceiver;
import android.content.ContentResolver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.pm.PackageManager;
import android.database.ContentObserver;
import android.media.AudioManager;
import android.media.RingtoneManager;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.preference.Preference;
import android.preference.Preference.OnPreferenceChangeListener;
import android.preference.PreferenceScreen;
import android.preference.SeekBarVolumizer;
import android.preference.TwoStatePreference;
import android.provider.Settings;

import com.android.settings.R;
import com.android.settings.SettingsPreferenceFragment;
import com.android.settings.SoundSettings;

public class NotificationSettings extends SettingsPreferenceFragment {
    private static final String TAG = "NotificationSettings";

    private static final String KEY_MEDIA_VOLUME = "media_volume";
    private static final String KEY_ALARM_VOLUME = "alarm_volume";
    private static final String KEY_RING_VOLUME = "ring_volume";
    private static final String KEY_RINGER_MODE = "ringer_mode";
    private static final String KEY_PHONE_RINGTONE = "ringtone";
    private static final String KEY_NOTIFICATION_RINGTONE = "notification_ringtone";
    private static final String KEY_VIBRATE_WHEN_RINGING = "vibrate_when_ringing";
    private static final String KEY_NOTIFICATION_ACCESS = "manage_notification_access";

    private static final int SAMPLE_CUTOFF = 2000;  // manually cap sample playback at 2 seconds

    private final VolumePreferenceCallback mVolumeCallback = new VolumePreferenceCallback();
    private final H mHandler = new H();
    private final SettingsObserver mSettingsObserver = new SettingsObserver();

    private Context mContext;
    private PackageManager mPM;

    private DropDownPreference mRingerMode;
    private Preference mPhoneRingtonePreference;
    private Preference mNotificationRingtonePreference;
    private TwoStatePreference mVibrateWhenRinging;
    private Preference mNotificationAccess;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        mContext = getActivity();
        mPM = mContext.getPackageManager();

        addPreferencesFromResource(R.xml.notification_settings);

        final PreferenceScreen root = getPreferenceScreen();
        initVolumePreference(KEY_MEDIA_VOLUME, AudioManager.STREAM_MUSIC);
        initVolumePreference(KEY_ALARM_VOLUME, AudioManager.STREAM_ALARM);
        initVolumePreference(KEY_RING_VOLUME, AudioManager.STREAM_RING);
        initRingerMode(root);
        initRingtones(root);
        initVibrateWhenRinging(root);

        mNotificationAccess = findPreference(KEY_NOTIFICATION_ACCESS);
        refreshNotificationListeners();
    }

    @Override
    public void onResume() {
        super.onResume();
        refreshNotificationListeners();
        lookupRingtoneNames();
        final IntentFilter filter = new IntentFilter(AudioManager.RINGER_MODE_CHANGED_ACTION);
        mContext.registerReceiver(mReceiver, filter);
        mSettingsObserver.register(true);
    }

    @Override
    public void onPause() {
        super.onPause();
        mVolumeCallback.stopSample();
        mContext.unregisterReceiver(mReceiver);
        mSettingsObserver.register(false);
    }

    // === Volumes ===

    private void initVolumePreference(String key, int stream) {
        final VolumeSeekBarPreference volumePref = (VolumeSeekBarPreference) findPreference(key);
        volumePref.setStream(stream);
        volumePref.setCallback(mVolumeCallback);
    }

    private final class VolumePreferenceCallback implements VolumeSeekBarPreference.Callback {
        private SeekBarVolumizer mCurrent;

        @Override
        public void onSampleStarting(SeekBarVolumizer sbv) {
            if (mCurrent != null && mCurrent != sbv) {
                mCurrent.stopSample();
            }
            mCurrent = sbv;
            if (mCurrent != null) {
                mHandler.removeMessages(H.STOP_SAMPLE);
                mHandler.sendEmptyMessageDelayed(H.STOP_SAMPLE, SAMPLE_CUTOFF);
            }
        }

        public void stopSample() {
            if (mCurrent != null) {
                mCurrent.stopSample();
            }
        }
    };

    // === Ringer mode ===

    private void initRingerMode(PreferenceScreen root) {
        mRingerMode = (DropDownPreference) root.findPreference(KEY_RINGER_MODE);
        if (mRingerMode == null) return;
        final AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
        mRingerMode.addItem(R.string.ringer_mode_audible, AudioManager.RINGER_MODE_NORMAL);
        mRingerMode.addItem(R.string.ringer_mode_vibrate, AudioManager.RINGER_MODE_VIBRATE);
        mRingerMode.addItem(R.string.ringer_mode_silent, AudioManager.RINGER_MODE_SILENT);
        updateRingerMode();
        mRingerMode.setCallback(new DropDownPreference.Callback() {
            @Override
            public boolean onItemSelected(int pos, Object value) {
                final int val = (Integer) value;
                am.setRingerMode(val);
                return true;
            }
        });
    }

    private void updateRingerMode() {
        final AudioManager am = (AudioManager) getSystemService(Context.AUDIO_SERVICE);
        mRingerMode.setSelectedValue(am.getRingerMode());
    }

    // === Phone & notification ringtone ===

    private void initRingtones(PreferenceScreen root) {
        mPhoneRingtonePreference = root.findPreference(KEY_PHONE_RINGTONE);
        mNotificationRingtonePreference = root.findPreference(KEY_NOTIFICATION_RINGTONE);
    }

    private void lookupRingtoneNames() {
        AsyncTask.execute(mLookupRingtoneNames);
    }

    private final Runnable mLookupRingtoneNames = new Runnable() {
        @Override
        public void run() {
            if (mPhoneRingtonePreference != null) {
                final CharSequence summary = SoundSettings.updateRingtoneName(
                        mContext, RingtoneManager.TYPE_RINGTONE);
                if (summary != null) {
                    mHandler.obtainMessage(H.UPDATE_PHONE_RINGTONE, summary).sendToTarget();
                }
            }
            if (mNotificationRingtonePreference != null) {
                final CharSequence summary = SoundSettings.updateRingtoneName(
                        mContext, RingtoneManager.TYPE_NOTIFICATION);
                if (summary != null) {
                    mHandler.obtainMessage(H.UPDATE_NOTIFICATION_RINGTONE, summary).sendToTarget();
                }
            }
        }
    };

    // === Vibrate when ringing ===

    private void initVibrateWhenRinging(PreferenceScreen root) {
        mVibrateWhenRinging = (TwoStatePreference) findPreference(KEY_VIBRATE_WHEN_RINGING);
        if (mVibrateWhenRinging == null) return;
        mVibrateWhenRinging.setPersistent(false);
        updateVibrateWhenRinging();
        mVibrateWhenRinging.setOnPreferenceChangeListener(new OnPreferenceChangeListener() {
            @Override
            public boolean onPreferenceChange(Preference preference, Object newValue) {
                final boolean val = (Boolean) newValue;
                return Settings.System.putInt(getContentResolver(),
                        Settings.System.VIBRATE_WHEN_RINGING,
                        val ? 1 : 0);
            }
        });
    }

    private void updateVibrateWhenRinging() {
        if (mVibrateWhenRinging == null) return;
        mVibrateWhenRinging.setChecked(Settings.System.getInt(getContentResolver(),
                Settings.System.VIBRATE_WHEN_RINGING, 0) != 0);
    }

    // === Notification listeners ===

    private void refreshNotificationListeners() {
        if (mNotificationAccess != null) {
            final int total = NotificationAccessSettings.getListenersCount(mPM);
            if (total == 0) {
                getPreferenceScreen().removePreference(mNotificationAccess);
            } else {
                final int n = NotificationAccessSettings.getEnabledListenersCount(mContext);
                if (n == 0) {
                    mNotificationAccess.setSummary(getResources().getString(
                            R.string.manage_notification_access_summary_zero));
                } else {
                    mNotificationAccess.setSummary(String.format(getResources().getQuantityString(
                            R.plurals.manage_notification_access_summary_nonzero,
                            n, n)));
                }
            }
        }
    }

    // === Callbacks ===

    private final BroadcastReceiver mReceiver = new BroadcastReceiver() {
        @Override
        public void onReceive(Context context, Intent intent) {
            if (AudioManager.RINGER_MODE_CHANGED_ACTION.equals(intent.getAction())) {
                updateRingerMode();
            }
        }
    };

    private final class SettingsObserver extends ContentObserver {
        private final Uri VIBRATE_WHEN_RINGING_URI =
                Settings.System.getUriFor(Settings.System.VIBRATE_WHEN_RINGING);

        public SettingsObserver() {
            super(mHandler);
        }

        public void register(boolean register) {
            final ContentResolver cr = getContentResolver();
            if (register) {
                cr.registerContentObserver(VIBRATE_WHEN_RINGING_URI, false, this);
            } else {
                cr.unregisterContentObserver(this);
            }
        }

        @Override
        public void onChange(boolean selfChange, Uri uri) {
            super.onChange(selfChange, uri);
            if (VIBRATE_WHEN_RINGING_URI.equals(uri)) {
                updateVibrateWhenRinging();
            }
        }
    }

    private final class H extends Handler {
        private static final int UPDATE_PHONE_RINGTONE = 1;
        private static final int UPDATE_NOTIFICATION_RINGTONE = 2;
        private static final int STOP_SAMPLE = 3;

        private H() {
            super(Looper.getMainLooper());
        }

        @Override
        public void handleMessage(Message msg) {
            switch (msg.what) {
                case UPDATE_PHONE_RINGTONE:
                    mPhoneRingtonePreference.setSummary((CharSequence) msg.obj);
                    break;
                case UPDATE_NOTIFICATION_RINGTONE:
                    mNotificationRingtonePreference.setSummary((CharSequence) msg.obj);
                    break;
                case STOP_SAMPLE:
                    mVolumeCallback.stopSample();
                    break;
            }
        }
    }
}