package net.micode.notes.gtask.remote;
 
public class GTaskManager {
    private static final String TAG = GTaskManager.class.getSimpleName();
    public static final int STATE_SUCCESS = 0;
    public static final int STATE_NETWORK_ERROR = 1;
    public static final int STATE_INTERNAL_ERROR = 2;
    public static final int STATE_SYNC_IN_PROGRESS = 3;
    public static final int STATE_SYNC_CANCELLED = 4; 
    private static GTaskManager mInstance = null;
 
    private Activity mActivity;
    private Context mContext;
    private ContentResolver mContentResolver;
    private boolean mSyncing;
    private boolean mCancelled;
    private HashMap<String, TaskList> mGTaskListHashMap;
    private HashMap<String, Node> mGTaskHashMap;
    private HashMap<String, MetaData> mMetaHashMap;
    private TaskList mMetaList;
    private HashSet<Long> mLocalDeleteIdMap;   
    private HashMap<String, Long> mGidToNid;
    private HashMap<Long, String> mNidToGid;
 
    private GTaskManager() {                                   //对象初始化函数
        mSyncing = false;                                      //正在同步,flase代表未执行
        mCancelled = false;                                    //全局标识，flase代表可以执行
        mGTaskListHashMap = new HashMap<String, TaskList>();   //<>代表Java的泛型,就是创建一个用类型作为参数的类。
        mGTaskHashMap = new HashMap<String, Node>();
        mMetaHashMap = new HashMap<String, MetaData>();
        mMetaList = null;
        mLocalDeleteIdMap = new HashSet<Long>();
        mGidToNid = new HashMap<String, Long>();    //GoogleID to NodeID??
        mNidToGid = new HashMap<Long, String>();    //NodeID to GoogleID???通过hashmap散列表建立映射
    }
 
    /**
     * 包含关键字synchronized，语言级同步，指明该函数可能运行在多线程的环境下。
     * 功能：类初始化函数
     * @author TTS
     * @return GtaskManger
     */
    public static synchronized GTaskManager getInstance() {    //可能运行在多线程环境下，使用语言级同步--synchronized
        if (mInstance == null) {
            mInstance = new GTaskManager();
        }
        return mInstance;
    }
 
    /**
     * 包含关键字synchronized，语言级同步，指明该函数可能运行在多线程的环境下。
     * @author TTS
     * @param activity
     */
    public synchronized void setActivityContext(Activity activity) {
        // used for getting auth token
        mActivity = activity;
    }
 
    /**
     * 核心函数
     * 功能：实现了本地同步操作和远端同步操作
     * @author TTS
     * @param context-----获取上下文
     * @param asyncTask-------用于同步的异步操作类
     * @return int
     */
    public int sync(Context context, GTaskASyncTask asyncTask) {           //核心函数
        if (mSyncing) {
            Log.d(TAG, "Sync is in progress");                       //创建日志文件（调试信息），debug
            return STATE_SYNC_IN_PROGRESS;
        }
        mContext = context;
        mContentResolver = mContext.getContentResolver();
        mSyncing = true;
        mCancelled = false;
        mGTaskListHashMap.clear();
        mGTaskHashMap.clear();
        mMetaHashMap.clear();
        mLocalDeleteIdMap.clear();
        mGidToNid.clear();
        mNidToGid.clear();
 
        try {
            GTaskClient client = GTaskClient.getInstance();    //getInstance即为创建一个实例,client--客户机
            client.resetUpdateArray();     //JSONArray类型，reset即置为NULL
 
            // login google task
            if (!mCancelled) {
                if (!client.login(mActivity)) {
                    throw new NetworkFailureException("login google task failed");
                }
            }
 
            // get the task list from google
            asyncTask.publishProgess(mContext.getString(R.string.sync_progress_init_list));
            initGTaskList();                                 //获取Google上的JSONtasklist转为本地TaskList
 
            // do content sync work
            asyncTask.publishProgess(mContext.getString(R.string.sync_progress_syncing));
            syncContent();
        } catch (NetworkFailureException e) {                       //分为两种异常，此类异常为网络异常
            Log.e(TAG, e.toString());                             //创建日志文件（调试信息），error
            return STATE_NETWORK_ERROR;
        } catch (ActionFailureException e) {                        //此类异常为操作异常
            Log.e(TAG, e.toString());
            return STATE_INTERNAL_ERROR;
        } catch (Exception e) {
            Log.e(TAG, e.toString());
            e.printStackTrace();
            return STATE_INTERNAL_ERROR;
        } finally {
            mGTaskListHashMap.clear();
            mGTaskHashMap.clear();
            mMetaHashMap.clear();
            mLocalDeleteIdMap.clear();
            mGidToNid.clear();
            mNidToGid.clear();
            mSyncing = false;
        }
 
        return mCancelled ? STATE_SYNC_CANCELLED : STATE_SUCCESS;
    }
 
    /**
     *功能：初始化GtaskList，获取Google上的JSONtasklist转为本地TaskList。
     *获得的数据存储在mMetaList，mGTaskListHashMap，mGTaskHashMap
     *@author TTS
     *@exception NetworkFailureException
     *@return void
     */
    private void initGTaskList() throws NetworkFailureException {
        if (mCancelled)
            return;
        GTaskClient client = GTaskClient.getInstance();    //getInstance即为创建一个实例，client应指远端客户机
        try {
        	//Json对象是Name Value对(即子元素)的无序集合，相当于一个Map对象。JsonObject类是bantouyan-json库对Json对象的抽象，提供操纵Json对象的各种方法。
        	//其格式为{"key1":value1,"key2",value2....};key 必须是字符串。
        	//因为ajax请求不刷新页面，但配合js可以实现局部刷新，因此json常常被用来作为异步请求的返回对象使用。
            JSONArray jsTaskLists = client.getTaskLists();     //原注释为get task list
 
            // init meta list first初始化
            mMetaList = null;                                       //TaskList类型
            for (int i = 0; i < jsTaskLists.length(); i++) {
                JSONObject object = jsTaskLists.getJSONObject(i);  //JSONObject与JSONArray一个为对象，一个为数组。此处取出单个JASONObject
                String gid = object.getString(GTaskStringUtils.GTASK_JSON_ID);
                String name = object.getString(GTaskStringUtils.GTASK_JSON_NAME);
 
                if (name.equals(GTaskStringUtils.MIUI_FOLDER_PREFFIX + GTaskStringUtils.FOLDER_META)) {
                    mMetaList = new TaskList();                    //MetaList意为元表,Tasklist类型，此处为初始化
                    mMetaList.setContentByRemoteJSON(object);      //将JSON中部分数据复制到自己定义的对象中相对应的数据：name->mname...
 
                    // load meta data
                    JSONArray jsMetas = client.getTaskList(gid);   //原注释为get action_list
                    for (int j = 0; j < jsMetas.length(); j++) {
                        object = (JSONObject) jsMetas.getJSONObject(j);
                        MetaData metaData = new MetaData();            //继承自Node
                        metaData.setContentByRemoteJSON(object);
                        if (metaData.isWorthSaving()) {                             //if not worth to save，metadata将不加入mMetaList 判断是否存入
                            mMetaList.addChildTask(metaData);
                            if (metaData.getGid() != null) {
                                mMetaHashMap.put(metaData.getRelatedGid(), metaData);
                            }
                        }
                    }
                }
            }
 
            // create meta list if not existed
            if (mMetaList == null) {
                mMetaList = new TaskList();
                mMetaList.setName(GTaskStringUtils.MIUI_FOLDER_PREFFIX
                        + GTaskStringUtils.FOLDER_META);
                GTaskClient.getInstance().createTaskList(mMetaList);
            }
 
            // init task list初始化
            for (int i = 0; i < jsTaskLists.length(); i++) {
                JSONObject object = jsTaskLists.getJSONObject(i);
                String gid = object.getString(GTaskStringUtils.GTASK_JSON_ID);  //通过getString函数传入本地某个标志数据的名称，获取其在远端的名称。
                String name = object.getString(GTaskStringUtils.GTASK_JSON_NAME);
 
                if (name.startsWith(GTaskStringUtils.MIUI_FOLDER_PREFFIX)
                        && !name.equals(GTaskStringUtils.MIUI_FOLDER_PREFFIX
                                + GTaskStringUtils.FOLDER_META)) {
                    TaskList tasklist = new TaskList();     //继承自Node
                    tasklist.setContentByRemoteJSON(object);
                    mGTaskListHashMap.put(gid, tasklist);       
                    mGTaskHashMap.put(gid, tasklist);                           
                   // load tasks加载
                    JSONArray jsTasks = client.getTaskList(gid);
                    for (int j = 0; j < jsTasks.length(); j++) {
                        object = (JSONObject) jsTasks.getJSONObject(j);
                        gid = object.getString(GTaskStringUtils.GTASK_JSON_ID);
                        Task task = new Task();
                        task.setContentByRemoteJSON(object);
                        if (task.isWorthSaving()) {
                            task.setMetaInfo(mMetaHashMap.get(gid));
                            tasklist.addChildTask(task);
                            mGTaskHashMap.put(gid, task);
                        }
                    }
                }
            }
        } catch (JSONException e) {
            Log.e(TAG, e.toString());
            e.printStackTrace();
            throw new ActionFailureException("initGTaskList: handing JSONObject failed");
        }