/* 
 * Copyright (c) 2010-2011, The MiCode Open Source Community (www.micode.net)
 * 
 * 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 net.micode.notes.data;

import android.content.Context;
import android.database.Cursor;
import android.provider.ContactsContract.CommonDataKinds.Phone;
import android.provider.ContactsContract.Data;
import android.telephony.PhoneNumberUtils;
import android.util.Log;

import java.util.HashMap;

public class Contact {

    // 静态缓存，用于存储已查询过的电话号码和对应的联系人姓名
    private static HashMap<String, String> sContactCache;
    // 日志标签
    private static final String TAG = "Contact";
    // SQL查询语句模板，用于根据电话号码查找联系人
    private static final String CALLER_ID_SELECTION = 
        "PHONE_NUMBERS_EQUAL(" + Phone.NUMBER + ",?) AND " +
        Data.MIMETYPE + "='" + Phone.CONTENT_ITEM_TYPE + "'" +
        " AND " + Data.RAW_CONTACT_ID + " IN " +
        "(SELECT raw_contact_id " +
        " FROM phone_lookup" +
        " WHERE min_match = '+')";

    /**
     * 根据电话号码获取联系人姓名
     * 
     * @param context 上下文环境
     * @param phoneNumber 要查询的电话号码
     * @return 对应的联系人姓名，如果未找到则返回null
     */
    public static String getContact(Context context, String phoneNumber) {
        // 初始化缓存
        if (sContactCache == null) {
            sContactCache = new HashMap<String, String>();
        }

        // 如果缓存中已有该电话号码的记录，则直接返回缓存中的联系人姓名
        if (sContactCache.containsKey(phoneNumber)) {
            return sContactCache.get(phoneNumber);
        }

        // 根据电话号码生成SQL查询语句
        String selection = CALLER_ID_SELECTION.replace("+", PhoneNumberUtils.toCallerIDMinMatch(phoneNumber));

        // 查询联系人数据库，获取对应的联系人姓名
        Cursor cursor = context.getContentResolver().query(
            Data.CONTENT_URI, // 查询的URI
            new String[] { Phone.DISPLAY_NAME }, // 查询的列
            selection, // 查询条件
            new String[] { phoneNumber }, // 查询条件的参数
            null // 排序方式
        );

        // TODO: 此处应添加处理查询结果并更新缓存的代码

        // 注意：在实际使用中，需要确保cursor被正确关闭以避免资源泄露
        // 例如，可以在finally块中调用cursor.close()

        return null; // 如果没有找到对应的联系人，则返回null
    }
}