/*
 * Copyright (C) 2011 Google Inc.
 * Licensed to 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.list;

import android.content.Context;
import android.content.res.Resources;
import android.database.Cursor;
import android.database.DataSetObserver;
import android.view.MotionEvent;
import android.view.View;
import android.view.ViewConfiguration;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.FrameLayout;

import com.android.dialer.R;
import com.android.dialer.calllog.CallLogAdapter;
import com.android.dialer.calllog.CallLogNotificationsHelper;
import com.android.dialer.calllog.CallLogQueryHandler;
import com.android.dialer.list.SwipeHelper.OnItemGestureListener;
import com.android.dialer.list.SwipeHelper.SwipeHelperCallback;

/**
 * An adapter that combines items from {@link com.android.contacts.common.list.ContactTileAdapter}
 * and {@link com.android.dialer.calllog.CallLogAdapter} into a single list.
 */
public class PhoneFavoriteMergedAdapter extends BaseAdapter {

    private class CustomDataSetObserver extends DataSetObserver {
        @Override
        public void onChanged() {
            notifyDataSetChanged();
        }
    }

    private static final String TAG = PhoneFavoriteMergedAdapter.class.getSimpleName();

    private static final int TILE_INTERACTION_TEASER_VIEW_POSITION = 2;
    private static final int TILE_INTERACTION_TEASER_VIEW_ID = -2;
    private static final int ALL_CONTACTS_BUTTON_ITEM_ID = -1;
    private final PhoneFavoritesTileAdapter mContactTileAdapter;
    private final CallLogAdapter mCallLogAdapter;
    private final View mShowAllContactsButton;
    private final PhoneFavoriteFragment mFragment;
    private final TileInteractionTeaserView mTileInteractionTeaserView;

    private final int mCallLogPadding;

    private final Context mContext;

    private final DataSetObserver mObserver;

    private final CallLogQueryHandler mCallLogQueryHandler;

    private final OnItemGestureListener mCallLogOnItemSwipeListener =
            new OnItemGestureListener() {
        @Override
        public void onSwipe(View view) {
            mCallLogQueryHandler.markNewCallsAsOld();
            mCallLogQueryHandler.markNewVoicemailsAsOld();
            CallLogNotificationsHelper.removeMissedCallNotifications();
            CallLogNotificationsHelper.updateVoicemailNotifications(mContext);
            mFragment.dismissShortcut(((View) view.getParent()).getHeight());
        }

        @Override
        public void onTouch() {}

        @Override
        public boolean isSwipeEnabled() {
            return true;
        }
    };

    private final CallLogQueryHandler.Listener mCallLogQueryHandlerListener =
            new CallLogQueryHandler.Listener() {
        @Override
        public void onVoicemailStatusFetched(Cursor statusCursor) {}

        @Override
        public void onCallsFetched(Cursor combinedCursor) {
            mCallLogAdapter.invalidateCache();
            mCallLogAdapter.changeCursor(combinedCursor);
            mCallLogAdapter.notifyDataSetChanged();
        }
    };

    public PhoneFavoriteMergedAdapter(Context context,
            PhoneFavoriteFragment fragment,
            PhoneFavoritesTileAdapter contactTileAdapter,
            CallLogAdapter callLogAdapter,
            View showAllContactsButton,
            TileInteractionTeaserView tileInteractionTeaserView) {
        final Resources resources = context.getResources();
        mContext = context;
        mFragment = fragment;
        mCallLogPadding = resources.getDimensionPixelSize(R.dimen.recent_call_log_item_padding);
        mContactTileAdapter = contactTileAdapter;
        mCallLogAdapter = callLogAdapter;
        mObserver = new CustomDataSetObserver();
        mCallLogAdapter.registerDataSetObserver(mObserver);
        mContactTileAdapter.registerDataSetObserver(mObserver);
        mShowAllContactsButton = showAllContactsButton;
        mTileInteractionTeaserView = tileInteractionTeaserView;
        mCallLogQueryHandler = new CallLogQueryHandler(mContext.getContentResolver(),
                mCallLogQueryHandlerListener);
    }

    @Override
    public int getCount() {
        if (mContactTileAdapter.getCount() > 0) {
            return mContactTileAdapter.getCount() + mCallLogAdapter.getCount() + 1 +
                    getTeaserViewCount();
        } else {
            return mCallLogAdapter.getCount();
        }
    }

    @Override
    public Object getItem(int position) {
        final int callLogAdapterCount = mCallLogAdapter.getCount();

        if (callLogAdapterCount > 0) {
            if (position < callLogAdapterCount) {
                return mCallLogAdapter.getItem(position);
            }
        }
        // Set position to the position of the actual favorite contact in the favorites adapter
        position = getAdjustedFavoritePosition(position, callLogAdapterCount);

        return mContactTileAdapter.getItem(position);
    }

    /**
     * In order to ensure that items have stable ids (for animation purposes), we need to
     * guarantee that every single item has a unique ID, even across data set changes.
     *
     * These are the ranges of IDs reserved for each item type.
     *
     * -(N + 1) to -3: CallLogAdapterItems, where N is equal to the number of call log items
     * -2: Teaser
     * -1: All contacts button
     * 0 to (N -1): Rows of tiled contacts, where N is equal to the max rows of tiled contacts
     * N to infinity: Rows of regular contacts. Their item id is calculated by N + contact_id,
     * where contact_id is guaranteed to never be negative.
     */
    @Override
    public long getItemId(int position) {
        final int callLogAdapterCount = mCallLogAdapter.getCount();
        if (position < callLogAdapterCount) {
            // Call log items are not animated, so reusing their position for IDs is fine.
            return ALL_CONTACTS_BUTTON_ITEM_ID - 2 - position;
        } else if (position == TILE_INTERACTION_TEASER_VIEW_POSITION + callLogAdapterCount &&
                mTileInteractionTeaserView.getShouldDisplayInList()){
            return TILE_INTERACTION_TEASER_VIEW_ID;
        } else if (position < (callLogAdapterCount + mContactTileAdapter.getCount() +
                getTeaserViewCount())) {
            return mContactTileAdapter.getItemId(
                    getAdjustedFavoritePosition(position, callLogAdapterCount));
        } else {
            // All contacts button
            return ALL_CONTACTS_BUTTON_ITEM_ID;
        }
    }

    @Override
    public boolean hasStableIds() {
        return true;
    }

    @Override
    public int getViewTypeCount() {
        return (mContactTileAdapter.getViewTypeCount() +            /* Favorite and frequent */
                mCallLogAdapter.getViewTypeCount() +                /* Recent call log */
                getTeaserViewCount() +                              /* Teaser */
                1);                                                 /* Show all contacts button. */
    }

    @Override
    public int getItemViewType(int position) {
        final int callLogAdapterCount = mCallLogAdapter.getCount();

        if (position < callLogAdapterCount) {
            // View type of the call log adapter is the last view type of the contact tile adapter
            // + 1
            return mContactTileAdapter.getViewTypeCount();
        } else if (position == TILE_INTERACTION_TEASER_VIEW_POSITION + callLogAdapterCount &&
                mTileInteractionTeaserView.getShouldDisplayInList()) {
            // View type of the teaser row is the last view type of the contact tile adapter + 3
            return mContactTileAdapter.getViewTypeCount() + 2;
        } else if (position < getCount() - 1) {
            return mContactTileAdapter.getItemViewType(
                    getAdjustedFavoritePosition(position, callLogAdapterCount));
        } else {
            // View type of the show all contact button is the last view type of the contact tile
            // adapter + 2
            return mContactTileAdapter.getViewTypeCount() + 1;
        }
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        final int callLogAdapterCount = mCallLogAdapter.getCount();

        if ((position == getCount() - 1) && (mContactTileAdapter.getCount() > 0)) {
            return mShowAllContactsButton;
        }

        if (mTileInteractionTeaserView.getShouldDisplayInList())  {
            if (position == TILE_INTERACTION_TEASER_VIEW_POSITION + callLogAdapterCount) {
                return mTileInteractionTeaserView;
            }
        }

        if (callLogAdapterCount > 0) {
            if (position == 0) {
                final SwipeableCallLogRow wrapper;
                if (convertView == null) {
                    wrapper = new SwipeableCallLogRow(mContext);
                    wrapper.setOnItemSwipeListener(mCallLogOnItemSwipeListener);
                } else {
                    wrapper = (SwipeableCallLogRow) convertView;
                }

                // Special case wrapper view for the most recent call log item. This allows
                // us to create a card-like effect for the more recent call log item in
                // the PhoneFavoriteMergedAdapter, but keep the original look of the item in
                // the CallLogAdapter.
                final View view = mCallLogAdapter.getView(position, convertView == null ?
                        null : wrapper.getChildAt(0), parent);
                wrapper.removeAllViews();
                final View callLogItem = view.findViewById(R.id.call_log_list_item);
                // Reset the internal call log item view if it is being recycled
                callLogItem.setTranslationX(0);
                callLogItem.setAlpha(1);
                wrapper.addView(view);
                return wrapper;
            }
        }

        // Set position to the position of the actual favorite contact in the
        // favorites adapter
        position = getAdjustedFavoritePosition(position, callLogAdapterCount);

        // Favorites section
        final View view = mContactTileAdapter.getView(position, convertView, parent);
        if (position >= mContactTileAdapter.getMaxTiledRows()) {
            final FrameLayout frameLayout = (FrameLayout) view;
            final View child = frameLayout.getChildAt(0);
            FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(
                    FrameLayout.LayoutParams.WRAP_CONTENT,
                    FrameLayout.LayoutParams.WRAP_CONTENT);
            child.setLayoutParams(params);
        }
        return view;
    }

    @Override
    public boolean areAllItemsEnabled() {
        return mCallLogAdapter.areAllItemsEnabled() && mContactTileAdapter.areAllItemsEnabled();
    }

    @Override
    public boolean isEnabled(int position) {
        final int callLogAdapterCount = mCallLogAdapter.getCount();
        if (position < callLogAdapterCount) {
            return mCallLogAdapter.isEnabled(position);
        } else { // For favorites section
            return mContactTileAdapter.isEnabled(
                    getAdjustedFavoritePosition(position, callLogAdapterCount));
        }
    }

    private int getAdjustedFavoritePosition(int position, int callLogAdapterCount) {
        if (position - callLogAdapterCount > TILE_INTERACTION_TEASER_VIEW_POSITION &&
                mTileInteractionTeaserView.getShouldDisplayInList()) {
            return position - callLogAdapterCount - 1;
        } else {
            return position - callLogAdapterCount;
        }
    }

    private int getTeaserViewCount() {
        return (mContactTileAdapter.getCount() > TILE_INTERACTION_TEASER_VIEW_POSITION &&
                mTileInteractionTeaserView.getShouldDisplayInList() ? 1 : 0);
    }

    /**
     * The swipeable call log row.
     * See also {@link PhoneFavoritesTileAdapter.ContactTileRow}.
     */
    private class SwipeableCallLogRow extends FrameLayout implements SwipeHelperCallback {
        private SwipeHelper mSwipeHelper;
        private OnItemGestureListener mOnItemSwipeListener;

        public SwipeableCallLogRow(Context context) {
            super(context);
            final float densityScale = getResources().getDisplayMetrics().density;
            final float pagingTouchSlop = ViewConfiguration.get(context)
                    .getScaledPagingTouchSlop();
            mSwipeHelper = new SwipeHelper(context, SwipeHelper.X, this,
                    densityScale, pagingTouchSlop);
        }

        @Override
        public void addView(View view) {
            view.setBackgroundResource(R.drawable.dialer_recent_card_bg);

            final FrameLayout.LayoutParams params = new FrameLayout.LayoutParams(
                    FrameLayout.LayoutParams.MATCH_PARENT,
                    FrameLayout.LayoutParams.WRAP_CONTENT);
            params.setMarginsRelative(mCallLogPadding, mCallLogPadding, mCallLogPadding,
                    mCallLogPadding);
            view.setLayoutParams(params);

            super.addView(view);
        }

        @Override
        public View getChildAtPosition(MotionEvent ev) {
            return getChildCount() > 0 ? getChildAt(0) : null;
        }

        @Override
        public View getChildContentView(View v) {
            return v.findViewById(R.id.call_log_list_item);
        }

        @Override
        public void onScroll() {}

        @Override
        public boolean canChildBeDismissed(View v) {
            return true;
        }

        @Override
        public void onBeginDrag(View v) {
            // We do this so the underlying ScrollView knows that it won't get
            // the chance to intercept events anymore
            requestDisallowInterceptTouchEvent(true);
        }

        @Override
        public void onChildDismissed(View v) {
            if (v != null && mOnItemSwipeListener != null) {
                mOnItemSwipeListener.onSwipe(v);
            }
        }

        @Override
        public void onDragCancelled(View v) {}

        @Override
        public boolean onInterceptTouchEvent(MotionEvent ev) {
            if (mSwipeHelper != null) {
                return mSwipeHelper.onInterceptTouchEvent(ev) || super.onInterceptTouchEvent(ev);
            } else {
                return super.onInterceptTouchEvent(ev);
            }
        }

        @Override
        public boolean onTouchEvent(MotionEvent ev) {
            if (mSwipeHelper != null) {
                return mSwipeHelper.onTouchEvent(ev) || super.onTouchEvent(ev);
            } else {
                return super.onTouchEvent(ev);
            }
        }

        public void setOnItemSwipeListener(OnItemGestureListener listener) {
            mOnItemSwipeListener = listener;
        }
    }
}