/*
 * 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.gtask.data;

import android.database.Cursor;
import android.util.Log;

import net.micode.notes.tool.GTaskStringUtils;

import org.json.JSONException;
import org.json.JSONObject;

/**
 * 元数据任务类，继承自基础Task类
 *
 * 功能说明：
 * - 用于处理与Google Task相关的元数据信息
 * - 存储关联任务ID(gid)和元信息JSON数据
 * - 作为特殊类型的任务，不参与常规的同步操作
 *
 * 注意事项：
 * - 此类重写了部分父类方法并直接抛出异常，因为元数据不应通过常规方式操作
 * - 主要用于在笔记和Google Task之间建立关联关系
 */
public class MetaData extends Task {
    private final static String TAG = MetaData.class.getSimpleName();

    private String mRelatedGid = null;
    /**
     * 设置元数据信息
     * @param gid 关联的Google Task ID
     * @param metaInfo 要存储的元信息JSON对象
     *
     * 说明：
     * - 将gid存入JSON对象中
     * - 设置固定的任务名称标识此为元数据任务
     */
    public void setMeta(String gid, JSONObject metaInfo) {
        try {
            metaInfo.put(GTaskStringUtils.META_HEAD_GTASK_ID, gid);
        } catch (JSONException e) {
            Log.e(TAG, "failed to put related gid");
        }
        setNotes(metaInfo.toString());
        setName(GTaskStringUtils.META_NOTE_NAME);
    }

    public String getRelatedGid() {
        return mRelatedGid;
    }

    @Override
    public boolean isWorthSaving() {
        return getNotes() != null;
    }
    /**
     * 从远程JSON数据设置内容
     * @param js 包含远程数据的JSON对象
     *
     * 说明：
     * - 解析notes字段中的JSON数据获取关联gid
     * - 如果解析失败会清空已存储的gid
     */
    @Override
    public void setContentByRemoteJSON(JSONObject js) {
        super.setContentByRemoteJSON(js);
        if (getNotes() != null) {
            try {
                JSONObject metaInfo = new JSONObject(getNotes().trim());
                mRelatedGid = metaInfo.getString(GTaskStringUtils.META_HEAD_GTASK_ID);
            } catch (JSONException e) {
                Log.w(TAG, "failed to get related gid");
                mRelatedGid = null;
            }
        }
    }
    /**
     * (禁止使用)从本地JSON设置内容
     * @throws IllegalAccessError 始终抛出，因为元数据不应通过本地JSON设置
     */
    @Override
    public void setContentByLocalJSON(JSONObject js) {
        // this function should not be called
        throw new IllegalAccessError("MetaData:setContentByLocalJSON should not be called");
    }
    /**
     * (禁止使用)获取本地JSON内容
     * @throws IllegalAccessError 始终抛出，因为元数据不应转换为本地JSON
     */
    @Override
    public JSONObject getLocalJSONFromContent() {
        throw new IllegalAccessError("MetaData:getLocalJSONFromContent should not be called");
    }
    /**
     * (禁止使用)获取同步动作
     * @throws IllegalAccessError 始终抛出，因为元数据不应参与常规同步
     */
    @Override
    public int getSyncAction(Cursor c) {
        throw new IllegalAccessError("MetaData:getSyncAction should not be called");
    }

}