/*
 * 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.model;
import android.content.ContentProviderOperation;
import android.content.ContentProviderResult;
import android.content.ContentUris;
import android.content.ContentValues;
import android.content.Context;
import android.content.OperationApplicationException;
import android.net.Uri;
import android.os.RemoteException;
import android.util.Log;

import net.micode.notes.data.Notes;
import net.micode.notes.data.Notes.CallNote;
import net.micode.notes.data.Notes.DataColumns;
import net.micode.notes.data.Notes.NoteColumns;
import net.micode.notes.data.Notes.TextNote;

import java.util.ArrayList;


public class Note {
    private ContentValues mNoteDiffValues;//ContentValues是用于给其他应用调用小米便签的内容的共享数据
    private NoteData mNoteData;
    private static final String TAG = "Note";
    /**
     * Create a new note id for adding a new note to databases
     */
    public static synchronized long getNewNoteId(Context context, long folderId) {
        // Create a new note in the database//获取新建便签的编号
        ContentValues values = new ContentValues();
        long createdTime = System.currentTimeMillis();//读取当前系统时间
        values.put(NoteColumns.CREATED_DATE, createdTime);
        values.put(NoteColumns.MODIFIED_DATE, createdTime);
        values.put(NoteColumns.TYPE, Notes.TYPE_NOTE);
        values.put(NoteColumns.LOCAL_MODIFIED, 1);
        values.put(NoteColumns.PARENT_ID, folderId);
        Uri uri = context.getContentResolver().insert(Notes.CONTENT_NOTE_URI, values);
//外部应用对ContentProvider中的数据进行添加、删除、修改和查询操作
        long noteId = 0;//实现外部应用对数据的插入删除等操作
        try {
            noteId = Long.valueOf(uri.getPathSegments().get(1));
        } catch (NumberFormatException e) {
            Log.e(TAG, "Get note id error :" + e.toString());
            noteId = 0;
        }
        if (noteId == -1) {
            throw new IllegalStateException("Wrong note id:" + noteId);
        }
        return noteId;
    }

    public Note() {//定义两个变量用来存储便签的数据，一个是存储便签属性、一个是存储便签内容
        mNoteDiffValues = new ContentValues();
        mNoteData = new NoteData();
    }

    public void setNoteValue(String key, String value) {//设置数据库表格的标签属性数据
        mNoteDiffValues.put(key, value);
        mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
        mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
    }

    public void setTextData(String key, String value) {
        mNoteData.setTextData(key, value);
    }
//设置数据库表格的标签文本内容的数据
    public void setTextDataId(long id) {
        mNoteData.setTextDataId(id);
    }
//设置文本数据的ID
    public long getTextDataId() {
        return mNoteData.mTextDataId;
    }
//获取文本数据的id
    public void setCallDataId(long id) {
        mNoteData.setCallDataId(id);
    }
//设置电话号码数据的ID
    public void setCallData(String key, String value) {
        mNoteData.setCallData(key, value);
    }
//得到电话号码数据的ID
    public boolean isLocalModified() {//判断是否是本地修改
        return mNoteDiffValues.size() > 0 || mNoteData.isLocalModified();
    }

    public boolean syncNote(Context context, long noteId) {//判断便签是否同步
        if (noteId <= 0) {
            throw new IllegalArgumentException("Wrong note id:" + noteId);
        }

        if (!isLocalModified()) {//如果本地没有发现修改，直接返回1，指示已经同步到数据库中
            return true;
        }

        /**
         * In theory, once data changed, the note should be updated on {@link NoteColumns#LOCAL_MODIFIED} and
         * {@link NoteColumns#MODIFIED_DATE}. For data safety, though update note fails, we also update the
         * note data info
         */
        if (context.getContentResolver().update(//发现更新错误时，及时反馈错误信息
                ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId), mNoteDiffValues, null,
                null) == 0) {
            Log.e(TAG, "Update note error, should not happen");
            // Do not return, fall through
        }
        mNoteDiffValues.clear();//初始化便签特征值

        if (mNoteData.isLocalModified()//判断未同步
                && (mNoteData.pushIntoContentResolver(context, noteId) == null)) {
            return false;
        }

        return true;
    }

    private class NoteData {//定义一个基本的便签内容的数据类，主要包含文本数据和电话号码数据
        private long mTextDataId;

        private ContentValues mTextDataValues;

        private long mCallDataId;

        private ContentValues mCallDataValues;

        private static final String TAG = "NoteData";

        public NoteData() {//NoteData的构造函数，初始化四个变量
            mTextDataValues = new ContentValues();
            mCallDataValues = new ContentValues();
            mTextDataId = 0;
            mCallDataId = 0;
        }

        boolean isLocalModified() {//下面是上述几个函数的具体实现
            return mTextDataValues.size() > 0 || mCallDataValues.size() > 0;
        }

        void setTextDataId(long id) {
            if(id <= 0) {
                throw new IllegalArgumentException("Text data id should larger than 0");
            }
            mTextDataId = id;
        }

        void setCallDataId(long id) {//判断ID是否合法
            if (id <= 0) {
                throw new IllegalArgumentException("Call data id should larger than 0");
            }
            mCallDataId = id;
        }

        void setCallData(String key, String value) {//设置电话号码数据内容，并且保存修改时间
            mCallDataValues.put(key, value);
            mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
            mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
        }

        void setTextData(String key, String value) {//设置文本数据
            mTextDataValues.put(key, value);
            mNoteDiffValues.put(NoteColumns.LOCAL_MODIFIED, 1);
            mNoteDiffValues.put(NoteColumns.MODIFIED_DATE, System.currentTimeMillis());
        }

        Uri pushIntoContentResolver(Context context, long noteId) {//下面函数的作用是将新的数据通过Uri的操作存储到数据库
            /**
             * Check for safety
             */
            if (noteId <= 0) {
                throw new IllegalArgumentException("Wrong note id:" + noteId);
            }

            ArrayList<ContentProviderOperation> operationList = new ArrayList<ContentProviderOperation>();//数据库操作链表
            ContentProviderOperation.Builder builder = null;

            if(mTextDataValues.size() > 0) {//把文本数据存入DataColumns
                mTextDataValues.put(DataColumns.NOTE_ID, noteId);
                if (mTextDataId == 0) {//uri插入文本数据
                    mTextDataValues.put(DataColumns.MIME_TYPE, TextNote.CONTENT_ITEM_TYPE);
                    Uri uri = context.getContentResolver().insert(Notes.CONTENT_DATA_URI,
                            mTextDataValues);
                    try {
                        setTextDataId(Long.valueOf(uri.getPathSegments().get(1)));//尝试重新给它设置id
                    } catch (NumberFormatException e) {
                        Log.e(TAG, "Insert new text data fail with noteId" + noteId);//插入数据失败
                        mTextDataValues.clear();
                        return null;
                    }
                } else {
                    builder = ContentProviderOperation.newUpdate(ContentUris.withAppendedId(//更新builder对象，追加uri数据和文本ID
                            Notes.CONTENT_DATA_URI, mTextDataId));
                    builder.withValues(mTextDataValues);
                    operationList.add(builder.build());
                }
                mTextDataValues.clear();
            }

            if(mCallDataValues.size() > 0) {//对于电话号码的数据也是和文本数据一样的同步处理
                mCallDataValues.put(DataColumns.NOTE_ID, noteId);
                if (mCallDataId == 0) {//将电话号码的id设定为uri提供的id
                    mCallDataValues.put(DataColumns.MIME_TYPE, CallNote.CONTENT_ITEM_TYPE);
                    Uri uri = context.getContentResolver().insert(Notes.CONTENT_DATA_URI,
                            mCallDataValues);
                    try {/异常处理
                        setCallDataId(Long.valueOf(uri.getPathSegments().get(1)));
                    } catch (NumberFormatException e) {
                        Log.e(TAG, "Insert new call data fail with noteId" + noteId);
                        mCallDataValues.clear();
                        return null;
                    }
                } else {// 当电话号码不为新建时，更新电话号码ID
                    builder = ContentProviderOperation.newUpdate(ContentUris.withAppendedId(
                            Notes.CONTENT_DATA_URI, mCallDataId));
                    builder.withValues(mCallDataValues);
                    operationList.add(builder.build());
                }
                mCallDataValues.clear();
            }
//把电话号码数据存入DataColumns
            if (operationList.size() > 0) {//存储过程中如果遇到异常，通过如下进行处理
                try {
                    ContentProviderResult[] results = context.getContentResolver().applyBatch(
                            Notes.AUTHORITY, operationList);
                    return (results == null || results.length == 0 || results[0] == null) ? null
                            : ContentUris.withAppendedId(Notes.CONTENT_NOTE_URI, noteId);
                } catch (RemoteException e) {//捕捉操作异常并写回日志
                    Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));
                    return null;
                } catch (OperationApplicationException e) {
                    Log.e(TAG, String.format("%s: %s", e.toString(), e.getMessage()));//异常日志
                    return null;
                }
            }
            return null;
        }
    }
}