/*
 * Copyright (C) 2018 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.systemui.volume;

import android.animation.Animator;
import android.animation.AnimatorInflater;
import android.animation.AnimatorSet;
import android.annotation.DrawableRes;
import android.annotation.Nullable;
import android.app.Dialog;
import android.app.KeyguardManager;
import android.car.Car;
import android.car.CarNotConnectedException;
import android.car.media.CarAudioManager;
import android.car.media.ICarVolumeCallback;
import android.content.ComponentName;
import android.content.Context;
import android.content.DialogInterface;
import android.content.ServiceConnection;
import android.content.res.TypedArray;
import android.content.res.XmlResourceParser;
import android.graphics.Color;
import android.graphics.drawable.ColorDrawable;
import android.graphics.PixelFormat;
import android.graphics.drawable.Drawable;
import android.media.AudioAttributes;
import android.media.AudioManager;
import android.os.Debug;
import android.os.Handler;
import android.os.IBinder;
import android.os.Looper;
import android.os.Message;
import android.util.AttributeSet;
import android.util.Log;
import android.util.SparseArray;
import android.util.Xml;
import android.view.ContextThemeWrapper;
import android.view.Gravity;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewGroup;
import android.view.Window;
import android.view.WindowManager;
import android.widget.SeekBar;
import android.widget.SeekBar.OnSeekBarChangeListener;

import androidx.car.widget.ListItem;
import androidx.car.widget.ListItemAdapter;
import androidx.car.widget.ListItemAdapter.BackgroundStyle;
import androidx.car.widget.ListItemProvider.ListProvider;
import androidx.car.widget.PagedListView;
import androidx.car.widget.SeekbarListItem;

import java.util.Iterator;
import org.xmlpull.v1.XmlPullParserException;

import java.io.IOException;
import java.io.PrintWriter;
import java.util.ArrayList;
import java.util.List;

import com.android.systemui.R;
import com.android.systemui.plugins.VolumeDialog;

/**
 * Car version of the volume dialog.
 *
 * Methods ending in "H" must be called on the (ui) handler.
 */
public class CarVolumeDialogImpl implements VolumeDialog {
  private static final String TAG = Util.logTag(CarVolumeDialogImpl.class);

  private static final String XML_TAG_VOLUME_ITEMS = "carVolumeItems";
  private static final String XML_TAG_VOLUME_ITEM = "item";
  private static final int HOVERING_TIMEOUT = 16000;
  private static final int NORMAL_TIMEOUT = 3000;
  private static final int LISTVIEW_ANIMATION_DURATION_IN_MILLIS = 250;
  private static final int DISMISS_DELAY_IN_MILLIS = 50;
  private static final int ARROW_FADE_IN_START_DELAY_IN_MILLIS = 100;

  private final Context mContext;
  private final H mHandler = new H();

  private Window mWindow;
  private CustomDialog mDialog;
  private PagedListView mListView;
  private ListItemAdapter mPagedListAdapter;
  // All the volume items.
  private final SparseArray<VolumeItem> mVolumeItems = new SparseArray<>();
  // Available volume items in car audio manager.
  private final List<VolumeItem> mAvailableVolumeItems = new ArrayList<>();
  // Volume items in the PagedListView.
  private final List<ListItem> mVolumeLineItems = new ArrayList<>();
  private final KeyguardManager mKeyguard;

  private Car mCar;
  private CarAudioManager mCarAudioManager;

  private boolean mHovering;
  private boolean mShowing;
  private boolean mExpanded;

  public CarVolumeDialogImpl(Context context) {
    mContext = new ContextThemeWrapper(context, com.android.systemui.R.style.qs_theme);
    mKeyguard = (KeyguardManager) mContext.getSystemService(Context.KEYGUARD_SERVICE);
    mCar = Car.createCar(mContext, mServiceConnection);
  }

  public void init(int windowType, Callback callback) {
    initDialog();

    mCar.connect();
  }

  @Override
  public void destroy() {
    mHandler.removeCallbacksAndMessages(null);

    cleanupAudioManager();
    // unregisterVolumeCallback is not being called when disconnect car, so we manually cleanup
    // audio manager beforehand.
    mCar.disconnect();
  }

  private void initDialog() {
    loadAudioUsageItems();
    mVolumeLineItems.clear();
    mDialog = new CustomDialog(mContext);

    mHovering = false;
    mShowing = false;
    mExpanded = false;
    mWindow = mDialog.getWindow();
    mWindow.requestFeature(Window.FEATURE_NO_TITLE);
    mWindow.setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
    mWindow.clearFlags(WindowManager.LayoutParams.FLAG_DIM_BEHIND
        | WindowManager.LayoutParams.FLAG_LAYOUT_INSET_DECOR);
    mWindow.addFlags(WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
        | WindowManager.LayoutParams.FLAG_LAYOUT_IN_SCREEN
        | WindowManager.LayoutParams.FLAG_NOT_TOUCH_MODAL
        | WindowManager.LayoutParams.FLAG_SHOW_WHEN_LOCKED
        | WindowManager.LayoutParams.FLAG_WATCH_OUTSIDE_TOUCH
        | WindowManager.LayoutParams.FLAG_HARDWARE_ACCELERATED);
    mWindow.setType(WindowManager.LayoutParams.TYPE_VOLUME_OVERLAY);
    mWindow.setWindowAnimations(com.android.internal.R.style.Animation_Toast);
    final WindowManager.LayoutParams lp = mWindow.getAttributes();
    lp.format = PixelFormat.TRANSLUCENT;
    lp.setTitle(VolumeDialogImpl.class.getSimpleName());
    lp.gravity = Gravity.TOP | Gravity.CENTER_HORIZONTAL;
    lp.windowAnimations = -1;
    mWindow.setAttributes(lp);
    mWindow.setLayout(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);

    mDialog.setCanceledOnTouchOutside(true);
    mDialog.setContentView(R.layout.car_volume_dialog);
    mDialog.setOnShowListener(dialog -> {
      mListView.setTranslationY(-mListView.getHeight());
      mListView.setAlpha(0);
      mListView.animate()
          .alpha(1)
          .translationY(0)
          .setDuration(LISTVIEW_ANIMATION_DURATION_IN_MILLIS)
          .setInterpolator(new SystemUIInterpolators.LogDecelerateInterpolator())
          .start();
    });
    mListView = (PagedListView) mWindow.findViewById(R.id.volume_list);
    mListView.setOnHoverListener((v, event) -> {
      int action = event.getActionMasked();
      mHovering = (action == MotionEvent.ACTION_HOVER_ENTER)
          || (action == MotionEvent.ACTION_HOVER_MOVE);
      rescheduleTimeoutH();
      return true;
    });

    mPagedListAdapter = new ListItemAdapter(mContext, new ListProvider(mVolumeLineItems),
        BackgroundStyle.PANEL);
    mListView.setAdapter(mPagedListAdapter);
    mListView.setMaxPages(PagedListView.UNLIMITED_PAGES);
  }

  public void show(int reason) {
    mHandler.obtainMessage(H.SHOW, reason, 0).sendToTarget();
  }

  public void dismiss(int reason) {
    mHandler.obtainMessage(H.DISMISS, reason, 0).sendToTarget();
  }

  private void showH(int reason) {
    if (D.BUG) {
      Log.d(TAG, "showH r=" + Events.DISMISS_REASONS[reason]);
    }

    mHandler.removeMessages(H.SHOW);
    mHandler.removeMessages(H.DISMISS);
    rescheduleTimeoutH();
    // Refresh the data set before showing.
    mPagedListAdapter.notifyDataSetChanged();
    if (mShowing) {
      return;
    }
    mShowing = true;

    mDialog.show();
    Events.writeEvent(mContext, Events.EVENT_SHOW_DIALOG, reason, mKeyguard.isKeyguardLocked());
  }

  protected void rescheduleTimeoutH() {
    mHandler.removeMessages(H.DISMISS);
    final int timeout = computeTimeoutH();
    mHandler.sendMessageDelayed(mHandler
        .obtainMessage(H.DISMISS, Events.DISMISS_REASON_TIMEOUT, 0), timeout);

    if (D.BUG) {
      Log.d(TAG, "rescheduleTimeout " + timeout + " " + Debug.getCaller());
    }
  }

  private int computeTimeoutH() {
    return mHovering ? HOVERING_TIMEOUT : NORMAL_TIMEOUT;
  }

  protected void dismissH(int reason) {
    if (D.BUG) {
      Log.d(TAG, "dismissH r=" + Events.DISMISS_REASONS[reason]);
    }

    mHandler.removeMessages(H.DISMISS);
    mHandler.removeMessages(H.SHOW);
    if (!mShowing) {
      return;
    }

    mListView.animate().cancel();
    mShowing = false;

    mListView.setTranslationY(0);
    mListView.setAlpha(1);
    mListView.animate()
        .alpha(0)
        .translationY(-mListView.getHeight())
        .setDuration(LISTVIEW_ANIMATION_DURATION_IN_MILLIS)
        .setInterpolator(new SystemUIInterpolators.LogAccelerateInterpolator())
        .withEndAction(() -> mHandler.postDelayed(() -> {
          if (D.BUG) {
            Log.d(TAG, "mDialog.dismiss()");
          }
          mDialog.dismiss();
        }, DISMISS_DELAY_IN_MILLIS))
        .start();

    Events.writeEvent(mContext, Events.EVENT_DISMISS_DIALOG, reason);
  }

  public void dump(PrintWriter writer) {
    writer.println(VolumeDialogImpl.class.getSimpleName() + " state:");
    writer.print("  mShowing: "); writer.println(mShowing);
  }

  private void loadAudioUsageItems() {
    try (XmlResourceParser parser = mContext.getResources().getXml(R.xml.car_volume_items)) {
      AttributeSet attrs = Xml.asAttributeSet(parser);
      int type;
      // Traverse to the first start tag
      while ((type=parser.next()) != XmlResourceParser.END_DOCUMENT
          && type != XmlResourceParser.START_TAG) {
      }

      if (!XML_TAG_VOLUME_ITEMS.equals(parser.getName())) {
        throw new RuntimeException("Meta-data does not start with carVolumeItems tag");
      }
      int outerDepth = parser.getDepth();
      int rank = 0;
      while ((type=parser.next()) != XmlResourceParser.END_DOCUMENT
          && (type != XmlResourceParser.END_TAG || parser.getDepth() > outerDepth)) {
        if (type == XmlResourceParser.END_TAG) {
          continue;
        }
        if (XML_TAG_VOLUME_ITEM.equals(parser.getName())) {
          TypedArray item = mContext.getResources().obtainAttributes(
              attrs, R.styleable.carVolumeItems_item);
          int usage = item.getInt(R.styleable.carVolumeItems_item_usage, -1);
          if (usage >= 0) {
            VolumeItem volumeItem = new VolumeItem();
            volumeItem.usage = usage;
            volumeItem.rank = rank;
            volumeItem.icon = item.getResourceId(R.styleable.carVolumeItems_item_icon, 0);
            mVolumeItems.put(usage, volumeItem);
            rank++;
          }
          item.recycle();
        }
      }
    } catch (XmlPullParserException | IOException e) {
      Log.e(TAG, "Error parsing volume groups configuration", e);
    }
  }

  private VolumeItem getVolumeItemForUsages(int[] usages) {
    int rank = Integer.MAX_VALUE;
    VolumeItem result = null;
    for (int usage : usages) {
      VolumeItem volumeItem = mVolumeItems.get(usage);
      if (volumeItem.rank < rank) {
        rank = volumeItem.rank;
        result = volumeItem;
      }
    }
    return result;
  }

  private static int getSeekbarValue(CarAudioManager carAudioManager, int volumeGroupId) {
    try {
      return carAudioManager.getGroupVolume(volumeGroupId);
    } catch (CarNotConnectedException e) {
      Log.e(TAG, "Car is not connected!", e);
    }
    return 0;
  }

  private static int getMaxSeekbarValue(CarAudioManager carAudioManager, int volumeGroupId) {
    try {
      return carAudioManager.getGroupMaxVolume(volumeGroupId);
    } catch (CarNotConnectedException e) {
      Log.e(TAG, "Car is not connected!", e);
    }
    return 0;
  }

  private SeekbarListItem addSeekbarListItem(VolumeItem volumeItem, int volumeGroupId,
      int supplementalIconId, @Nullable View.OnClickListener supplementalIconOnClickListener) {
    SeekbarListItem listItem = new SeekbarListItem(mContext);
    listItem.setMax(getMaxSeekbarValue(mCarAudioManager, volumeGroupId));
    int color = mContext.getResources().getColor(R.color.car_volume_dialog_tint);
    int progress = getSeekbarValue(mCarAudioManager, volumeGroupId);
    listItem.setProgress(progress);
    listItem.setOnSeekBarChangeListener(
        new CarVolumeDialogImpl.VolumeSeekBarChangeListener(volumeGroupId, mCarAudioManager));
    Drawable primaryIcon = mContext.getResources().getDrawable(volumeItem.icon);
    primaryIcon.setTint(color);
    listItem.setPrimaryActionIcon(primaryIcon);
    if (supplementalIconId != 0) {
      Drawable supplementalIcon = mContext.getResources().getDrawable(supplementalIconId);
      supplementalIcon.setTint(color);
      listItem.setSupplementalIcon(supplementalIcon, true,
          supplementalIconOnClickListener);
    } else {
      listItem.setSupplementalEmptyIcon(true);
    }

    mVolumeLineItems.add(listItem);
    volumeItem.listItem = listItem;
    volumeItem.progress = progress;
    return listItem;
  }

  private VolumeItem findVolumeItem(SeekbarListItem targetItem) {
    for (int i = 0; i < mVolumeItems.size(); ++i) {
      VolumeItem volumeItem = mVolumeItems.valueAt(i);
      if (volumeItem.listItem == targetItem) {
        return volumeItem;
      }
    }
    return null;
  }

  private void cleanupAudioManager() {
    try {
      mCarAudioManager.unregisterVolumeCallback(mVolumeChangeCallback.asBinder());
    } catch (CarNotConnectedException e) {
      Log.e(TAG, "Car is not connected!", e);
    }
    mVolumeLineItems.clear();
    mCarAudioManager = null;
  }

  private final class H extends Handler {
    private static final int SHOW = 1;
    private static final int DISMISS = 2;

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

    @Override
    public void handleMessage(Message msg) {
      switch (msg.what) {
        case SHOW:
          showH(msg.arg1);
          break;
        case DISMISS:
          dismissH(msg.arg1);
          break;
        default:
      }
    }
  }

  private final class CustomDialog extends Dialog implements DialogInterface {
    public CustomDialog(Context context) {
      super(context, com.android.systemui.R.style.qs_theme);
    }

    @Override
    public boolean dispatchTouchEvent(MotionEvent ev) {
      rescheduleTimeoutH();
      return super.dispatchTouchEvent(ev);
    }

    @Override
    protected void onStart() {
      super.setCanceledOnTouchOutside(true);
      super.onStart();
    }

    @Override
    protected void onStop() {
      super.onStop();
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
      if (isShowing()) {
        if (event.getAction() == MotionEvent.ACTION_OUTSIDE) {
          dismissH(Events.DISMISS_REASON_TOUCH_OUTSIDE);
          return true;
        }
      }
      return false;
    }
  }

  private final class ExpandIconListener implements View.OnClickListener {
    @Override
    public void onClick(final View v) {
      mExpanded = !mExpanded;
      Animator inAnimator;
      if (mExpanded) {
        for (int groupId = 0; groupId < mAvailableVolumeItems.size(); ++groupId) {
          // Adding the items which are not coming from the default item.
          VolumeItem volumeItem = mAvailableVolumeItems.get(groupId);
          if (volumeItem.defaultItem) {
            // Set progress here due to the progress of seekbar may not be updated.
            volumeItem.listItem.setProgress(volumeItem.progress);
          } else {
            addSeekbarListItem(volumeItem, groupId, 0, null);
          }
        }
        inAnimator = AnimatorInflater.loadAnimator(
            mContext, R.anim.car_arrow_fade_in_rotate_up);
      } else {
        // Only keeping the default stream if it is not expended.
        Iterator itr = mVolumeLineItems.iterator();
        while (itr.hasNext()) {
          SeekbarListItem seekbarListItem = (SeekbarListItem) itr.next();
          VolumeItem volumeItem = findVolumeItem(seekbarListItem);
          if (!volumeItem.defaultItem) {
            itr.remove();
          } else {
            // Set progress here due to the progress of seekbar may not be updated.
            seekbarListItem.setProgress(volumeItem.progress);
          }
        }
        inAnimator = AnimatorInflater.loadAnimator(
            mContext, R.anim.car_arrow_fade_in_rotate_down);
      }

      Animator outAnimator = AnimatorInflater.loadAnimator(
          mContext, R.anim.car_arrow_fade_out);
      inAnimator.setStartDelay(ARROW_FADE_IN_START_DELAY_IN_MILLIS);
      AnimatorSet animators = new AnimatorSet();
      animators.playTogether(outAnimator, inAnimator);
      animators.setTarget(v);
      animators.start();
      mPagedListAdapter.notifyDataSetChanged();
    }
  }

  private final class VolumeSeekBarChangeListener implements OnSeekBarChangeListener {
    private final int mVolumeGroupId;
    private final CarAudioManager mCarAudioManager;

    private VolumeSeekBarChangeListener(int volumeGroupId, CarAudioManager carAudioManager) {
      mVolumeGroupId = volumeGroupId;
      mCarAudioManager = carAudioManager;
    }

    @Override
    public void onProgressChanged(SeekBar seekBar, int progress, boolean fromUser) {
      if (!fromUser) {
        // For instance, if this event is originated from AudioService,
        // we can ignore it as it has already been handled and doesn't need to be
        // sent back down again.
        return;
      }
      try {
        if (mCarAudioManager == null) {
          Log.w(TAG, "Ignoring volume change event because the car isn't connected");
          return;
        }
        mAvailableVolumeItems.get(mVolumeGroupId).progress = progress;
        mCarAudioManager.setGroupVolume(mVolumeGroupId, progress, 0);
      } catch (CarNotConnectedException e) {
        Log.e(TAG, "Car is not connected!", e);
      }
    }

    @Override
    public void onStartTrackingTouch(SeekBar seekBar) {}

    @Override
    public void onStopTrackingTouch(SeekBar seekBar) {}
  }

  private final ICarVolumeCallback mVolumeChangeCallback = new ICarVolumeCallback.Stub() {
    @Override
    public void onGroupVolumeChanged(int groupId, int flags) {
      VolumeItem volumeItem = mAvailableVolumeItems.get(groupId);
      int value = getSeekbarValue(mCarAudioManager, groupId);
      // Do not update the progress if it is the same as before. When car audio manager sets its
      // group volume caused by the seekbar progress changed, it also triggers this callback.
      // Updating the seekbar at the same time could block the continuous seeking.
      if (value != volumeItem.progress) {
        volumeItem.listItem.setProgress(value);
        volumeItem.progress = value;
        if ((flags & AudioManager.FLAG_SHOW_UI) != 0) {
          show(Events.SHOW_REASON_VOLUME_CHANGED);
        }
      }
    }

    @Override
    public void onMasterMuteChanged(int flags) {
      // ignored
    }
  };

  private final ServiceConnection mServiceConnection = new ServiceConnection() {
    @Override
    public void onServiceConnected(ComponentName name, IBinder service) {
      try {
        mExpanded = false;
        mCarAudioManager = (CarAudioManager) mCar.getCarManager(Car.AUDIO_SERVICE);
        int volumeGroupCount = mCarAudioManager.getVolumeGroupCount();
        // Populates volume slider items from volume groups to UI.
        for (int groupId = 0; groupId < volumeGroupCount; groupId++) {
          VolumeItem volumeItem = getVolumeItemForUsages(
              mCarAudioManager.getUsagesForVolumeGroupId(groupId));
          mAvailableVolumeItems.add(volumeItem);
          // The first one is the default item.
          if (groupId == 0) {
            volumeItem.defaultItem = true;
            addSeekbarListItem(volumeItem, groupId, R.drawable.car_ic_keyboard_arrow_down,
                new ExpandIconListener());
          }
        }

        // If list is already initiated, update its content.
        if (mPagedListAdapter != null) {
          mPagedListAdapter.notifyDataSetChanged();
        }
        mCarAudioManager.registerVolumeCallback(mVolumeChangeCallback.asBinder());
      } catch (CarNotConnectedException e) {
        Log.e(TAG, "Car is not connected!", e);
      }
    }

    /**
     * This does not get called when service is properly disconnected.
     * So we need to also handle cleanups in destroy().
     */
    @Override
    public void onServiceDisconnected(ComponentName name) {
      cleanupAudioManager();
    }
  };

  /**
   * Wrapper class which contains information of each volume group.
   */
  private static class VolumeItem {
    private @AudioAttributes.AttributeUsage int usage;
    private int rank;
    private boolean defaultItem = false;
    private @DrawableRes int icon;
    private SeekbarListItem listItem;
    private int progress;
  }
}