/*
 * 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.
 */

// 数据库笔记实体类，负责处理便签数据的本地存储和同步操作
package net.micode.notes.gtask.data;

// Android基础组件导入
import android.appwidget.AppWidgetManager;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.net.Uri;
import android.util.Log;

// 项目内部类导入
import net.micode.notes.data.Notes;
import net.micode.notes.data.Notes.DataColumns;
import net.micode.notes.data.Notes.NoteColumns;
import net.micode.notes.gtask.exception.ActionFailureException;
import net.micode.notes.tool.GTaskStringUtils;
import net.micode.notes.tool.ResourceParser;

// JSON处理类导入
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

// Java工具类导入
import java.util.ArrayList;

/**
 * SQLite数据库笔记操作类，封装便签的CRUD操作和Google Task同步功能
 */
public class SqlNote {
    // 日志标签
    private static final String TAG = SqlNote.class.getSimpleName();

    // 无效ID常量
    private static final int INVALID_ID = -99999;

    // 笔记表查询字段投影
    public static final String[] PROJECTION_NOTE = new String[] {
            NoteColumns.ID, NoteColumns.ALERTED_DATE, NoteColumns.BG_COLOR_ID,
            NoteColumns.CREATED_DATE, NoteColumns.HAS_ATTACHMENT, NoteColumns.MODIFIED_DATE,
            NoteColumns.NOTES_COUNT, NoteColumns.PARENT_ID, NoteColumns.SNIPPET, NoteColumns.TYPE,
            NoteColumns.WIDGET_ID, NoteColumns.WIDGET_TYPE, NoteColumns.SYNC_ID,
            NoteColumns.LOCAL_MODIFIED, NoteColumns.ORIGIN_PARENT_ID, NoteColumns.GTASK_ID,
            NoteColumns.VERSION
    };

    // 字段列索引常量定义
    public static final int ID_COLUMN = 0;
    public static final int ALERTED_DATE_COLUMN = 1;
    public static final int BG_COLOR_ID_COLUMN = 2;
    public static final int CREATED_DATE_COLUMN = 3;
    public static final int HAS_ATTACHMENT_COLUMN = 4;
    public static final int MODIFIED_DATE_COLUMN = 5;
    public static final int NOTES_COUNT_COLUMN = 6;
    public static final int PARENT_ID_COLUMN = 7;
    public static final int SNIPPET_COLUMN = 8;
    public static final int TYPE_COLUMN = 9;
    public static final int WIDGET_ID_COLUMN = 10;
    public static final int WIDGET_TYPE_COLUMN = 11;
    public static final int SYNC_ID_COLUMN = 12;
    public static final int LOCAL_MODIFIED_COLUMN = 13;
    public static final int ORIGIN_PARENT_ID_COLUMN = 14;
    public static final int GTASK_ID_COLUMN = 15;
    public static final int VERSION_COLUMN = 16;

    // 上下文对象
    private Context mContext;

    // 内容解析器
    private ContentResolver mContentResolver;

    // 是否为新创建标志
    private boolean mIsCreate;

    // 笔记ID
    private long mId;

    // 提醒日期
    private long mAlertDate;

    // 背景颜色ID
    private int mBgColorId;

    // 创建日期
    private long mCreatedDate;

    // 是否有附件标志
    private int mHasAttachment;

    // 修改日期
    private long mModifiedDate;

    // 父节点ID
    private long mParentId;

    // 内容摘要
    private String mSnippet;

    // 笔记类型
    private int mType;

    // 小部件ID
    private int mWidgetId;

    // 小部件类型
    private int mWidgetType;

    // 原始父节点ID
    private long mOriginParent;

    // 数据版本号
    private long mVersion;

    // 差异内容值对象
    private ContentValues mDiffNoteValues;

    // 关联数据列表
    private ArrayList<SqlData> mDataList;

    /**
     * 构造函数（新建笔记）
     * @param context 上下文对象
     */
    public SqlNote(Context context) {
        // 初始化上下文和内容解析器
        mContext = context;
        mContentResolver = context.getContentResolver();

        // 设置新建标志
        mIsCreate = true;

        // 初始化默认值
        mId = INVALID_ID;
        mAlertDate = 0;
        mBgColorId = ResourceParser.getDefaultBgId(context);
        mCreatedDate = System.currentTimeMillis();
        mHasAttachment = 0;
        mModifiedDate = System.currentTimeMillis();
        mParentId = 0;
        mSnippet = "";
        mType = Notes.TYPE_NOTE;
        mWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID;
        mWidgetType = Notes.TYPE_WIDGET_INVALIDE;
        mOriginParent = 0;
        mVersion = 0;

        // 初始化差异值和数据列表
        mDiffNoteValues = new ContentValues();
        mDataList = new ArrayList<SqlData>();
    }

    /**
     * 构造函数（从游标加载）
     * @param context 上下文对象
     * @param c 数据库游标
     */
    public SqlNote(Context context, Cursor c) {
        mContext = context;
        mContentResolver = context.getContentResolver();
        mIsCreate = false;

        // 从游标加载数据
        loadFromCursor(c);
        mDataList = new ArrayList<SqlData>();

        // 如果是笔记类型，加载关联数据
        if (mType == Notes.TYPE_NOTE)
            loadDataContent();

        mDiffNoteValues = new ContentValues();
    }

    /**
     * 构造函数（从ID加载）
     * @param context 上下文对象
     * @param id 笔记ID
     */
    public SqlNote(Context context, long id) {
        mContext = context;
        mContentResolver = context.getContentResolver();
        mIsCreate = false;

        // 从ID加载数据
        loadFromCursor(id);
        mDataList = new ArrayList<SqlData>();

        // 如果是笔记类型，加载关联数据
        if (mType == Notes.TYPE_NOTE)
            loadDataContent();

        mDiffNoteValues = new ContentValues();
    }

    /**
     * 从ID加载笔记数据
     * @param id 笔记ID
     */
    private void loadFromCursor(long id) {
        Cursor c = null;
        try {
            // 查询指定ID的笔记
            c = mContentResolver.query(Notes.CONTENT_NOTE_URI, PROJECTION_NOTE, "(_id=?)",
                    new String[] { String.valueOf(id) }, null);

            if (c != null) {
                c.moveToNext();
                loadFromCursor(c);
            } else {
                Log.w(TAG, "loadFromCursor: cursor = null");
            }
        } finally {
            if (c != null)
                c.close();
        }
    }

    /**
     * 从游标加载笔记数据
     * @param c 数据库游标
     */
    private void loadFromCursor(Cursor c) {
        // 从游标读取各字段值
        mId = c.getLong(ID_COLUMN);
        mAlertDate = c.getLong(ALERTED_DATE_COLUMN);
        mBgColorId = c.getInt(BG_COLOR_ID_COLUMN);
        mCreatedDate = c.getLong(CREATED_DATE_COLUMN);
        mHasAttachment = c.getInt(HAS_ATTACHMENT_COLUMN);
        mModifiedDate = c.getLong(MODIFIED_DATE_COLUMN);
        mParentId = c.getLong(PARENT_ID_COLUMN);
        mSnippet = c.getString(SNIPPET_COLUMN);
        mType = c.getInt(TYPE_COLUMN);
        mWidgetId = c.getInt(WIDGET_ID_COLUMN);
        mWidgetType = c.getInt(WIDGET_TYPE_COLUMN);
        mVersion = c.getLong(VERSION_COLUMN);
    }

    /**
     * 加载笔记关联数据内容
     */
    private void loadDataContent() {
        Cursor c = null;
        mDataList.clear();
        try {
            // 查询关联数据
            c = mContentResolver.query(Notes.CONTENT_DATA_URI, SqlData.PROJECTION_DATA,
                    "(note_id=?)", new String[] { String.valueOf(mId) }, null);

            if (c != null) {
                if (c.getCount() == 0) {
                    Log.w(TAG, "it seems that the note has not data");
                    return;
                }

                // 遍历游标创建数据对象
                while (c.moveToNext()) {
                    SqlData data = new SqlData(mContext, c);
                    mDataList.add(data);
                }
            } else {
                Log.w(TAG, "loadDataContent: cursor = null");
            }
        } finally {
            if (c != null)
                c.close();
        }
    }

    /**
     * 从JSON对象设置笔记内容
     * @param js JSON对象
     * @return 是否设置成功
     */
    public boolean setContent(JSONObject js) {
        try {
            // 获取笔记节点
            JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);

            // 处理系统文件夹
            if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_SYSTEM) {
                Log.w(TAG, "cannot set system folder");
            }
            // 处理普通文件夹
            else if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_FOLDER) {
                // 更新摘要和类型
                String snippet = note.has(NoteColumns.SNIPPET) ? note.getString(NoteColumns.SNIPPET) : "";
                if (mIsCreate || !mSnippet.equals(snippet)) {
                    mDiffNoteValues.put(NoteColumns.SNIPPET, snippet);
                }
                mSnippet = snippet;

                int type = note.has(NoteColumns.TYPE) ? note.getInt(NoteColumns.TYPE) : Notes.TYPE_NOTE;
                if (mIsCreate || mType != type) {
                    mDiffNoteValues.put(NoteColumns.TYPE, type);
                }
                mType = type;
            }
            // 处理普通笔记
            else if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_NOTE) {
                // 获取数据数组
                JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA);

                // 更新各字段值
                long id = note.has(NoteColumns.ID) ? note.getLong(NoteColumns.ID) : INVALID_ID;
                if (mIsCreate || mId != id) {
                    mDiffNoteValues.put(NoteColumns.ID, id);
                }
                mId = id;

                long alertDate = note.has(NoteColumns.ALERTED_DATE) ? note.getLong(NoteColumns.ALERTED_DATE) : 0;
                if (mIsCreate || mAlertDate != alertDate) {
                    mDiffNoteValues.put(NoteColumns.ALERTED_DATE, alertDate);
                }
                mAlertDate = alertDate;

                int bgColorId = note.has(NoteColumns.BG_COLOR_ID) ? note.getInt(NoteColumns.BG_COLOR_ID)
                        : ResourceParser.getDefaultBgId(mContext);
                if (mIsCreate || mBgColorId != bgColorId) {
                    mDiffNoteValues.put(NoteColumns.BG_COLOR_ID, bgColorId);
                }
                mBgColorId = bgColorId;

                long createDate = note.has(NoteColumns.CREATED_DATE) ? note.getLong(NoteColumns.CREATED_DATE)
                        : System.currentTimeMillis();
                if (mIsCreate || mCreatedDate != createDate) {
                    mDiffNoteValues.put(NoteColumns.CREATED_DATE, createDate);
                }
                mCreatedDate = createDate;

                int hasAttachment = note.has(NoteColumns.HAS_ATTACHMENT) ? note.getInt(NoteColumns.HAS_ATTACHMENT) : 0;
                if (mIsCreate || mHasAttachment != hasAttachment) {
                    mDiffNoteValues.put(NoteColumns.HAS_ATTACHMENT, hasAttachment);
                }
                mHasAttachment = hasAttachment;

                long modifiedDate = note.has(NoteColumns.MODIFIED_DATE) ? note.getLong(NoteColumns.MODIFIED_DATE)
                        : System.currentTimeMillis();
                if (mIsCreate || mModifiedDate != modifiedDate) {
                    mDiffNoteValues.put(NoteColumns.MODIFIED_DATE, modifiedDate);
                }
                mModifiedDate = modifiedDate;

                long parentId = note.has(NoteColumns.PARENT_ID) ? note.getLong(NoteColumns.PARENT_ID) : 0;
                if (mIsCreate || mParentId != parentId) {
                    mDiffNoteValues.put(NoteColumns.PARENT_ID, parentId);
                }
                mParentId = parentId;

                String snippet = note.has(NoteColumns.SNIPPET) ? note.getString(NoteColumns.SNIPPET) : "";
                if (mIsCreate || !mSnippet.equals(snippet)) {
                    mDiffNoteValues.put(NoteColumns.SNIPPET, snippet);
                }
                mSnippet = snippet;

                int type = note.has(NoteColumns.TYPE) ? note.getInt(NoteColumns.TYPE) : Notes.TYPE_NOTE;
                if (mIsCreate || mType != type) {
                    mDiffNoteValues.put(NoteColumns.TYPE, type);
                }
                mType = type;

                int widgetId = note.has(NoteColumns.WIDGET_ID) ? note.getInt(NoteColumns.WIDGET_ID)
                        : AppWidgetManager.INVALID_APPWIDGET_ID;
                if (mIsCreate || mWidgetId != widgetId) {
                    mDiffNoteValues.put(NoteColumns.WIDGET_ID, widgetId);
                }
                mWidgetId = widgetId;

                int widgetType = note.has(NoteColumns.WIDGET_TYPE) ? note.getInt(NoteColumns.WIDGET_TYPE)
                        : Notes.TYPE_WIDGET_INVALIDE;
                if (mIsCreate || mWidgetType != widgetType) {
                    mDiffNoteValues.put(NoteColumns.WIDGET_TYPE, widgetType);
                }
                mWidgetType = widgetType;

                long originParent = note.has(NoteColumns.ORIGIN_PARENT_ID) ? note.getLong(NoteColumns.ORIGIN_PARENT_ID) : 0;
                if (mIsCreate || mOriginParent != originParent) {
                    mDiffNoteValues.put(NoteColumns.ORIGIN_PARENT_ID, originParent);
                }
                mOriginParent = originParent;

                // 处理关联数据
                for (int i = 0; i < dataArray.length(); i++) {
                    JSONObject data = dataArray.getJSONObject(i);
                    SqlData sqlData = null;

                    // 查找已有数据
                    if (data.has(DataColumns.ID)) {
                        long dataId = data.getLong(DataColumns.ID);
                        for (SqlData temp : mDataList) {
                            if (dataId == temp.getId()) {
                                sqlData = temp;
                            }
                        }
                    }

                    // 创建新数据对象
                    if (sqlData == null) {
                        sqlData = new SqlData(mContext);
                        mDataList.add(sqlData);
                    }

                    // 设置数据内容
                    sqlData.setContent(data);
                }
            }
        } catch (JSONException e) {
            Log.e(TAG, e.toString());
            e.printStackTrace();
            return false;
        }
        return true;
    }

    /**
     * 获取笔记内容的JSON表示
     * @return JSON对象
     */
    public JSONObject getContent() {
        try {
            JSONObject js = new JSONObject();

            // 检查是否已创建
            if (mIsCreate) {
                Log.e(TAG, "it seems that we haven't created this in database yet");
                return null;
            }

            JSONObject note = new JSONObject();

            // 处理普通笔记
            if (mType == Notes.TYPE_NOTE) {
                // 添加笔记字段
                note.put(NoteColumns.ID, mId);
                note.put(NoteColumns.ALERTED_DATE, mAlertDate);
                note.put(NoteColumns.BG_COLOR_ID, mBgColorId);
                note.put(NoteColumns.CREATED_DATE, mCreatedDate);
                note.put(NoteColumns.HAS_ATTACHMENT, mHasAttachment);
                note.put(NoteColumns.MODIFIED_DATE, mModifiedDate);
                note.put(NoteColumns.PARENT_ID, mParentId);
                note.put(NoteColumns.SNIPPET, mSnippet);
                note.put(NoteColumns.TYPE, mType);
                note.put(NoteColumns.WIDGET_ID, mWidgetId);
                note.put(NoteColumns.WIDGET_TYPE, mWidgetType);
                note.put(NoteColumns.ORIGIN_PARENT_ID, mOriginParent);
                js.put(GTaskStringUtils.META_HEAD_NOTE, note);

                // 添加关联数据
                JSONArray dataArray = new JSONArray();
                for (SqlData sqlData : mDataList) {
                    JSONObject data = sqlData.getContent();
                    if (data != null) {
                        dataArray.put(data);
                    }
                }
                js.put(GTaskStringUtils.META_HEAD_DATA, dataArray);
            }
            // 处理文件夹和系统文件夹
            else if (mType == Notes.TYPE_FOLDER || mType == Notes.TYPE_SYSTEM) {
                note.put(NoteColumns.ID, mId);
                note.put(NoteColumns.TYPE, mType);
                note.put(NoteColumns.SNIPPET, mSnippet);
                js.put(GTaskStringUtils.META_HEAD_NOTE, note);
            }

            return js;
        } catch (JSONException e) {
            Log.e(TAG, e.toString());
            e.printStackTrace();
        }
        return null;
    }

    /**
     * 设置父节点ID
     * @param id 父节点ID
     */
    public void setParentId(long id) {
        mParentId = id;
        mDiffNoteValues.put(NoteColumns.PARENT_ID, id);
    }

    /**
     * 设置Google Task ID
     * @param gid Google Task ID
     */
    public void setGtaskId(String gid) {
        mDiffNoteValues.put(NoteColumns.GTASK_ID, gid);
    }

    /**
     * 设置同步ID
     * @param syncId 同步ID
     */
    public void setSyncId(long syncId) {
        mDiffNoteValues.put(NoteColumns.SYNC_ID, syncId);
    }

    /**
     * 重置本地修改标志
     */
    public void resetLocalModified() {
        mDiffNoteValues.put(NoteColumns.LOCAL_MODIFIED, 0);
    }

    /**
     * 获取笔记ID
     * @return 笔记ID
     */
    public long getId() {
        return mId;
    }

    /**
     * 获取父节点ID
     * @return 父节点ID
     */
    public long getParentId() {
        return mParentId;
    }

    /**
     * 获取内容摘要
     * @return 内容摘要
     */
    public String getSnippet() {
        return mSnippet;
    }

    /**
     * 检查是否为笔记类型
     * @return 是否为笔记类型
     */
    public boolean isNoteType() {
        return mType == Notes.TYPE_NOTE;
    }

    /**
     * 提交更改到数据库
     * @param validateVersion 是否验证版本号
     */
    public void commit(boolean validateVersion) {
        // 处理新建笔记
        if (mIsCreate) {
            // 处理无效ID
            if (mId == INVALID_ID && mDiffNoteValues.containsKey(NoteColumns.ID)) {
                mDiffNoteValues.remove(NoteColumns.ID);
            }

            // 插入新笔记
            Uri uri = mContentResolver.insert(Notes.CONTENT_NOTE_URI, mDiffNoteValues);
            try {
                mId = Long.valueOf(uri.getPathSegments().get(1));
            } catch (NumberFormatException e) {
                Log.e(TAG, "Get note id error :" + e.toString());
                throw new ActionFailureException("create note failed");
            }

            // 检查ID是否有效
            if (mId == 0) {
                throw new IllegalStateException("Create thread id failed");
            }

            // 提交关联数据
            if (mType == Notes.TYPE_NOTE) {
                for (SqlData sqlData : mDataList) {
                    sqlData.commit(mId, false, -1);
                }
            }
        }
        // 处理已有笔记更新
        else {
            // 检查ID有效性
            if (mId <= 0 && mId != Notes.ID_ROOT_FOLDER && mId != Notes.ID_CALL_RECORD_FOLDER) {
                Log.e(TAG, "No such note");
                throw new IllegalStateException("Try to update note with invalid id");
            }

            // 如果有差异值需要更新
            if (mDiffNoteValues.size() > 0) {
                mVersion ++;
                int result = 0;

                // 根据是否验证版本选择更新方式
                if (!validateVersion) {
                    result = mContentResolver.update(Notes.CONTENT_NOTE_URI, mDiffNoteValues,
                            "(" + NoteColumns.ID + "=?)",
                            new String[] { String.valueOf(mId) });
                } else {
                    result = mContentResolver.update(Notes.CONTENT_NOTE_URI, mDiffNoteValues,
                            "(" + NoteColumns.ID + "=?) AND (" + NoteColumns.VERSION + "<=?)",
                            new String[] { String.valueOf(mId), String.valueOf(mVersion) });
                }

                // 检查更新结果
                if (result == 0) {
                    Log.w(TAG, "there is no update. maybe user updates note when syncing");
                }
            }

            // 提交关联数据
            if (mType == Notes.TYPE_NOTE) {
                for (SqlData sqlData : mDataList) {
                    sqlData.commit(mId, validateVersion, mVersion);
                }
            }
        }

        // 刷新本地数据
        loadFromCursor(mId);
        if (mType == Notes.TYPE_NOTE)
            loadDataContent();

        // 重置差异值和创建标志
        mDiffNoteValues.clear();
        mIsCreate = false;
    }
}