/*
 * 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.util;

import android.database.Cursor;
import android.provider.ContactsContract.PhotoFiles;
import android.provider.ContactsContract.StreamItemPhotos;

/**
 * Data object for a photo associated with a social stream item.  These are comparable;
 * entries with a lower sort index will be displayed on top (with the ID used as a
 * tie-breaker).
 */
public class StreamItemPhotoEntry implements Comparable<StreamItemPhotoEntry> {
    private final long mId;
    private final int mSortIndex;
    private final long mPhotoFileId;
    private final String mPhotoUri;
    private final int mHeight;
    private final int mWidth;
    private final int mFileSize;

    public StreamItemPhotoEntry(long id, int sortIndex, long photoFileId, String photoUri,
            int height, int width, int fileSize) {
        mId = id;
        mSortIndex = sortIndex;
        mPhotoFileId = photoFileId;
        mPhotoUri = photoUri;
        mHeight = height;
        mWidth = width;
        mFileSize = fileSize;
    }

    public StreamItemPhotoEntry(Cursor cursor) {
        // This is expected to be populated via a cursor containing a join of all
        // StreamItemPhotos columns and all PhotoFiles columns (except for ID).
        mId = getLong(cursor, StreamItemPhotos._ID);
        mSortIndex = getInt(cursor, StreamItemPhotos.SORT_INDEX, -1);
        mPhotoFileId = getLong(cursor, StreamItemPhotos.PHOTO_FILE_ID);
        mPhotoUri = getString(cursor, StreamItemPhotos.PHOTO_URI);
        mHeight = getInt(cursor, PhotoFiles.HEIGHT, -1);
        mWidth = getInt(cursor, PhotoFiles.WIDTH, -1);
        mFileSize = getInt(cursor, PhotoFiles.FILESIZE, -1);
    }

    public long getId() {
        return mId;
    }

    public int getSortIndex() {
        return mSortIndex;
    }

    public long getPhotoFileId() {
        return mPhotoFileId;
    }

    public String getPhotoUri() {
        return mPhotoUri;
    }

    public int getHeight() {
        return mHeight;
    }

    public int getWidth() {
        return mWidth;
    }

    public int getFileSize() {
        return mFileSize;
    }

    @Override
    public int compareTo(StreamItemPhotoEntry streamItemPhotoEntry) {
        // Sort index is used to compare, falling back to ID if neither entry has a
        // sort index specified (entries without a sort index are sorted after entries
        // that have one).
        if (mSortIndex == streamItemPhotoEntry.mSortIndex) {
            if (mSortIndex == -1) {
                return mId == streamItemPhotoEntry.mId ? 0
                        : mId < streamItemPhotoEntry.mId ? -1 : 1;
            } else {
                return 0;
            }
        } else {
            if (mSortIndex == -1) {
                return 1;
            }
            if (streamItemPhotoEntry.mSortIndex == -1) {
                return -1;
            }
            return mSortIndex == streamItemPhotoEntry.mSortIndex ? 0
                    : mSortIndex < streamItemPhotoEntry.mSortIndex ? -1 : 1;
        }
    }

    private static String getString(Cursor cursor, String columnName) {
        return cursor.getString(cursor.getColumnIndex(columnName));
    }

    private static int getInt(Cursor cursor, String columnName, int missingValue) {
        final int columnIndex = cursor.getColumnIndex(columnName);
        return cursor.isNull(columnIndex) ? missingValue : cursor.getInt(columnIndex);
    }

    private static long getLong(Cursor cursor, String columnName) {
        final int columnIndex = cursor.getColumnIndex(columnName);
        return cursor.getLong(columnIndex);
    }
}