/*
 * 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.dialer.app.settings;

import android.content.Context;
import android.media.RingtoneManager;
import android.os.Build;
import android.os.Bundle;
import android.os.Handler;
import android.os.Message;
import android.os.Vibrator;
import android.preference.CheckBoxPreference;
import android.preference.ListPreference;
import android.preference.Preference;
import android.preference.PreferenceFragment;
import android.preference.PreferenceScreen;
import android.provider.Settings;
import android.telephony.CarrierConfigManager;
import android.telephony.TelephonyManager;
import android.widget.Toast;
import com.android.dialer.app.R;
import com.android.dialer.compat.SdkVersionOverride;
import com.android.dialer.util.SettingsUtil;

public class SoundSettingsFragment extends PreferenceFragment
    implements Preference.OnPreferenceChangeListener {

  private static final int NO_DTMF_TONE = 0;
  private static final int PLAY_DTMF_TONE = 1;

  private static final int NO_VIBRATION_FOR_CALLS = 0;
  private static final int DO_VIBRATION_FOR_CALLS = 1;

  private static final int DTMF_TONE_TYPE_NORMAL = 0;

  private static final int MSG_UPDATE_RINGTONE_SUMMARY = 1;

  private Preference mRingtonePreference;
  private final Handler mRingtoneLookupComplete =
      new Handler() {
        @Override
        public void handleMessage(Message msg) {
          switch (msg.what) {
            case MSG_UPDATE_RINGTONE_SUMMARY:
              mRingtonePreference.setSummary((CharSequence) msg.obj);
              break;
          }
        }
      };
  private final Runnable mRingtoneLookupRunnable =
      new Runnable() {
        @Override
        public void run() {
          updateRingtonePreferenceSummary();
        }
      };
  private CheckBoxPreference mVibrateWhenRinging;
  private CheckBoxPreference mPlayDtmfTone;
  private ListPreference mDtmfToneLength;

  @Override
  public Context getContext() {
    return getActivity();
  }

  @Override
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    addPreferencesFromResource(R.xml.sound_settings);

    Context context = getActivity();

    mRingtonePreference = findPreference(context.getString(R.string.ringtone_preference_key));
    mVibrateWhenRinging =
        (CheckBoxPreference) findPreference(context.getString(R.string.vibrate_on_preference_key));
    mPlayDtmfTone =
        (CheckBoxPreference) findPreference(context.getString(R.string.play_dtmf_preference_key));
    mDtmfToneLength =
        (ListPreference)
            findPreference(context.getString(R.string.dtmf_tone_length_preference_key));

    if (hasVibrator()) {
      mVibrateWhenRinging.setOnPreferenceChangeListener(this);
    } else {
      getPreferenceScreen().removePreference(mVibrateWhenRinging);
      mVibrateWhenRinging = null;
    }

    mPlayDtmfTone.setOnPreferenceChangeListener(this);
    mPlayDtmfTone.setChecked(shouldPlayDtmfTone());

    TelephonyManager telephonyManager =
        (TelephonyManager) getActivity().getSystemService(Context.TELEPHONY_SERVICE);
    if (SdkVersionOverride.getSdkVersion(Build.VERSION_CODES.M) >= Build.VERSION_CODES.M
        && telephonyManager.canChangeDtmfToneLength()
        && (telephonyManager.isWorldPhone() || !shouldHideCarrierSettings())) {
      mDtmfToneLength.setOnPreferenceChangeListener(this);
      mDtmfToneLength.setValueIndex(
          Settings.System.getInt(
              context.getContentResolver(),
              Settings.System.DTMF_TONE_TYPE_WHEN_DIALING,
              DTMF_TONE_TYPE_NORMAL));
    } else {
      getPreferenceScreen().removePreference(mDtmfToneLength);
      mDtmfToneLength = null;
    }
  }

  @Override
  public void onResume() {
    super.onResume();

    if (!Settings.System.canWrite(getContext())) {
      // If the user launches this setting fragment, then toggles the WRITE_SYSTEM_SETTINGS
      // AppOp, then close the fragment since there is nothing useful to do.
      getActivity().onBackPressed();
      return;
    }

    if (mVibrateWhenRinging != null) {
      mVibrateWhenRinging.setChecked(shouldVibrateWhenRinging());
    }

    // Lookup the ringtone name asynchronously.
    new Thread(mRingtoneLookupRunnable).start();
  }

  /**
   * Supports onPreferenceChangeListener to look for preference changes.
   *
   * @param preference The preference to be changed
   * @param objValue The value of the selection, NOT its localized display value.
   */
  @Override
  public boolean onPreferenceChange(Preference preference, Object objValue) {
    if (!Settings.System.canWrite(getContext())) {
      // A user shouldn't be able to get here, but this protects against monkey crashes.
      Toast.makeText(
              getContext(),
              getResources().getString(R.string.toast_cannot_write_system_settings),
              Toast.LENGTH_SHORT)
          .show();
      return true;
    }
    if (preference == mVibrateWhenRinging) {
      boolean doVibrate = (Boolean) objValue;
      Settings.System.putInt(
          getActivity().getContentResolver(),
          Settings.System.VIBRATE_WHEN_RINGING,
          doVibrate ? DO_VIBRATION_FOR_CALLS : NO_VIBRATION_FOR_CALLS);
    } else if (preference == mDtmfToneLength) {
      int index = mDtmfToneLength.findIndexOfValue((String) objValue);
      Settings.System.putInt(
          getActivity().getContentResolver(), Settings.System.DTMF_TONE_TYPE_WHEN_DIALING, index);
    }
    return true;
  }

  /** Click listener for toggle events. */
  @Override
  public boolean onPreferenceTreeClick(PreferenceScreen preferenceScreen, Preference preference) {
    if (!Settings.System.canWrite(getContext())) {
      Toast.makeText(
              getContext(),
              getResources().getString(R.string.toast_cannot_write_system_settings),
              Toast.LENGTH_SHORT)
          .show();
      return true;
    }
    if (preference == mPlayDtmfTone) {
      Settings.System.putInt(
          getActivity().getContentResolver(),
          Settings.System.DTMF_TONE_WHEN_DIALING,
          mPlayDtmfTone.isChecked() ? PLAY_DTMF_TONE : NO_DTMF_TONE);
    }
    return true;
  }

  /** Updates the summary text on the ringtone preference with the name of the ringtone. */
  private void updateRingtonePreferenceSummary() {
    SettingsUtil.updateRingtoneName(
        getActivity(),
        mRingtoneLookupComplete,
        RingtoneManager.TYPE_RINGTONE,
        mRingtonePreference.getKey(),
        MSG_UPDATE_RINGTONE_SUMMARY);
  }

  /**
   * Obtain the value for "vibrate when ringing" setting. The default value is false.
   *
   * <p>Watch out: if the setting is missing in the device, this will try obtaining the old "vibrate
   * on ring" setting from AudioManager, and save the previous setting to the new one.
   */
  private boolean shouldVibrateWhenRinging() {
    int vibrateWhenRingingSetting =
        Settings.System.getInt(
            getActivity().getContentResolver(),
            Settings.System.VIBRATE_WHEN_RINGING,
            NO_VIBRATION_FOR_CALLS);
    return hasVibrator() && (vibrateWhenRingingSetting == DO_VIBRATION_FOR_CALLS);
  }

  /** Obtains the value for dialpad/DTMF tones. The default value is true. */
  private boolean shouldPlayDtmfTone() {
    int dtmfToneSetting =
        Settings.System.getInt(
            getActivity().getContentResolver(),
            Settings.System.DTMF_TONE_WHEN_DIALING,
            PLAY_DTMF_TONE);
    return dtmfToneSetting == PLAY_DTMF_TONE;
  }

  /** Whether the device hardware has a vibrator. */
  private boolean hasVibrator() {
    Vibrator vibrator = (Vibrator) getActivity().getSystemService(Context.VIBRATOR_SERVICE);
    return vibrator != null && vibrator.hasVibrator();
  }

  private boolean shouldHideCarrierSettings() {
    CarrierConfigManager configManager =
        (CarrierConfigManager) getActivity().getSystemService(Context.CARRIER_CONFIG_SERVICE);
    return configManager
        .getConfig()
        .getBoolean(CarrierConfigManager.KEY_HIDE_CARRIER_NETWORK_SETTINGS_BOOL);
  }
}