/*
 * Copyright (C) 2011 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.contacts.list;

import android.app.Activity;
import android.app.Fragment;
import android.app.LoaderManager;
import android.app.LoaderManager.LoaderCallbacks;
import android.content.CursorLoader;
import android.content.Loader;
import android.content.res.Resources;
import android.database.Cursor;
import android.graphics.Rect;
import android.net.Uri;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ListView;
import android.widget.TextView;
import com.android.contacts.R;
import com.android.contacts.common.ContactPhotoManager;
import com.android.contacts.common.ContactTileLoaderFactory;
import com.android.contacts.common.list.ContactTileAdapter;
import com.android.contacts.common.list.ContactTileAdapter.DisplayType;
import com.android.contacts.common.list.ContactTileView;
import com.android.contacts.common.util.ContactListViewUtils;
import com.android.contacts.common.util.SchedulingUtils;

/**
 * Fragment containing a list of starred contacts followed by a list of frequently contacted.
 *
 * TODO: Make this an abstract class so that the favorites, frequent, and group list functionality
 * can be separated out. This will make it easier to customize any of those lists if necessary
 * (i.e. adding header views to the ListViews in the fragment). This work was started
 * by creating {@link ContactTileFrequentFragment}.
 */
public class ContactTileListFragment extends Fragment {
    private static final String TAG = ContactTileListFragment.class.getSimpleName();

    public interface Listener {
        void onContactSelected(Uri contactUri, Rect targetRect);
        void onCallNumberDirectly(String phoneNumber);
    }

    private Listener mListener;
    private ContactTileAdapter mAdapter;
    private DisplayType mDisplayType;
    private TextView mEmptyView;
    private ListView mListView;

    private boolean mOptionsMenuHasFrequents;

    @Override
    public void onAttach(Activity activity) {
        super.onAttach(activity);

        Resources res = getResources();
        int columnCount = res.getInteger(R.integer.contact_tile_column_count_in_favorites);

        mAdapter = new ContactTileAdapter(activity, mAdapterListener,
                columnCount, mDisplayType);
        mAdapter.setPhotoLoader(ContactPhotoManager.getInstance(activity));
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        return inflateAndSetupView(inflater, container, savedInstanceState,
                R.layout.contact_tile_list);
    }

    protected View inflateAndSetupView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState, int layoutResourceId) {
        View listLayout = inflater.inflate(layoutResourceId, container, false);

        mEmptyView = (TextView) listLayout.findViewById(R.id.contact_tile_list_empty);
        mListView = (ListView) listLayout.findViewById(R.id.contact_tile_list);

        mListView.setItemsCanFocus(true);
        mListView.setAdapter(mAdapter);
        ContactListViewUtils.applyCardPaddingToView(getResources(), mListView, listLayout);

        return listLayout;
    }

    @Override
    public void onHiddenChanged(boolean hidden) {
        super.onHiddenChanged(hidden);
        if (getActivity() != null && getView() != null && !hidden) {
            // If the padding was last applied when in a hidden state, it may have been applied
            // incorrectly. Therefore we need to reapply it.
            ContactListViewUtils.applyCardPaddingToView(getResources(), mListView, getView());
        }
    }

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

        // initialize the loader for this display type and destroy all others
        final DisplayType[] loaderTypes = mDisplayType.values();
        for (int i = 0; i < loaderTypes.length; i++) {
            if (loaderTypes[i] == mDisplayType) {
                getLoaderManager().initLoader(mDisplayType.ordinal(), null,
                        mContactTileLoaderListener);
            } else {
                getLoaderManager().destroyLoader(loaderTypes[i].ordinal());
            }
        }
    }

    /**
     * Returns whether there are any frequents with the side effect of setting the
     * internal flag mOptionsMenuHasFrequents to the value.  This should be called externally
     * by the activity that is about to prepare the options menu with the clear frequents
     * menu item.
     */
    public boolean hasFrequents() {
        mOptionsMenuHasFrequents = internalHasFrequents();
        return mOptionsMenuHasFrequents;
    }

    /**
     * Returns whether there are any frequents.
     */
    private boolean internalHasFrequents() {
        return mAdapter.getNumFrequents() > 0;
    }

    public void setColumnCount(int columnCount) {
        mAdapter.setColumnCount(columnCount);
    }

    public void setDisplayType(DisplayType displayType) {
        mDisplayType = displayType;
        mAdapter.setDisplayType(mDisplayType);
    }

    public void enableQuickContact(boolean enableQuickContact) {
        mAdapter.enableQuickContact(enableQuickContact);
    }

    private final LoaderManager.LoaderCallbacks<Cursor> mContactTileLoaderListener =
            new LoaderCallbacks<Cursor>() {

        @Override
        public CursorLoader onCreateLoader(int id, Bundle args) {
            switch (mDisplayType) {
              case STARRED_ONLY:
                  return ContactTileLoaderFactory.createStarredLoader(getActivity());
              case STREQUENT:
                  return ContactTileLoaderFactory.createStrequentLoader(getActivity());
              case FREQUENT_ONLY:
                  return ContactTileLoaderFactory.createFrequentLoader(getActivity());
              default:
                  throw new IllegalStateException(
                      "Unrecognized DisplayType " + mDisplayType);
            }
        }

        @Override
        public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
            if (data == null || data.isClosed()) {
                Log.e(TAG, "Failed to load contacts");
                return;
            }
            mAdapter.setContactCursor(data);
            mEmptyView.setText(getEmptyStateText());
            mListView.setEmptyView(mEmptyView);

            // invalidate the menu options if needed
            invalidateOptionsMenuIfNeeded();
        }

        @Override
        public void onLoaderReset(Loader<Cursor> loader) {}
    };

    private boolean isOptionsMenuChanged() {
        return mOptionsMenuHasFrequents != internalHasFrequents();
    }

    private void invalidateOptionsMenuIfNeeded() {
        if (isOptionsMenuChanged()) {
            getActivity().invalidateOptionsMenu();
        }
    }

    private String getEmptyStateText() {
        String emptyText;
        switch (mDisplayType) {
            case STREQUENT:
            case STARRED_ONLY:
                emptyText = getString(R.string.listTotalAllContactsZeroStarred);
                break;
            case FREQUENT_ONLY:
            case GROUP_MEMBERS:
                emptyText = getString(R.string.noContacts);
                break;
            default:
                throw new IllegalArgumentException("Unrecognized DisplayType " + mDisplayType);
        }
        return emptyText;
    }

    public void setListener(Listener listener) {
        mListener = listener;
    }

    private ContactTileView.Listener mAdapterListener =
            new ContactTileView.Listener() {
        @Override
        public void onContactSelected(Uri contactUri, Rect targetRect) {
            if (mListener != null) {
                mListener.onContactSelected(contactUri, targetRect);
            }
        }

        @Override
        public void onCallNumberDirectly(String phoneNumber) {
            if (mListener != null) {
                mListener.onCallNumberDirectly(phoneNumber);
            }
        }

        @Override
        public int getApproximateTileWidth() {
            return getView().getWidth() / mAdapter.getColumnCount();
        }
    };
}