/*
 * Copyright (C) 2016 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.bluetooth.util;

import java.util.ArrayList;
import java.util.List;

/**
 * Centralized Bluetooth Interoperability workaround utilities and database.
 * This is the Java version. An analagous native version can be found
 * in /system/bt/devices/include/interop_database.h.
 */
public class Interop {

    /**
     * Simple interop entry consisting of a workarond id (see below)
     * and a (partial or complete) Bluetooth device address string
     * to match against.
     */
    private static class Entry {
        public String address;
        public int workaround_id;

        Entry(int workaroundId, String address) {
            this.workaround_id = workaroundId;
            this.address = address;
        }
    }

    /**
     * The actual "database" of interop entries.
     */
    private static List<Entry> sEntries = null;

    /**
     * Workaround ID for deivces which do not accept non-ASCII
     * characters in SMS messages.
     */
    public static final int INTEROP_MAP_ASCIIONLY = 1;

    /**
     * Initializes the interop datbase with the relevant workaround
     * entries.
     * When adding entries, please provide a description for each
     * device as to what problem the workaround addresses.
     */
    private static void lazyInitInteropDatabase() {
        if (sEntries != null) {
            return;
        }
        sEntries = new ArrayList<Entry>();

        /** Mercedes Benz NTG 4.5 does not handle non-ASCII characters in SMS */
        sEntries.add(new Entry(INTEROP_MAP_ASCIIONLY, "00:26:e8"));
    }

    /**
     * Checks wheter a given device identified by |address| is a match
     * for a given workaround identified by |workaroundId|.
     * Return true if the address matches, false otherwise.
     */
    public static boolean matchByAddress(int workaroundId, String address) {
        if (address == null || address.isEmpty()) {
            return false;
        }

        lazyInitInteropDatabase();
        for (Entry entry : sEntries) {
            if (entry.workaround_id == workaroundId && entry.address.startsWith(
                    address.toLowerCase())) {
                return true;
            }
        }

        return false;
    }
}