/*
 * 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.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;

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;

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

import java.util.ArrayList;

/**
 * SqlNote 类用于管理与 Notes 数据库相关的操作，
 * 提供对笔记数据的增、删、查、改操作。
 * 该类将与 GTask 等数据交互，使用 SQLite 数据库与 ContentProvider 进行数据存取。
 */
public class SqlNote {

    // 日志标签，用于输出调试信息
    private static final String TAG = SqlNote.class.getSimpleName();

    // 定义一个无效的 ID 值，用于初始化或标识错误的 ID
    private static final int INVALID_ID = -99999;

    // 定义一个 Notes 表的列名数组，用于查询操作中获取不同的列数据
    public static final String[] PROJECTION_NOTE = new String[] {
            NoteColumns.ID, // 笔记的 ID
            NoteColumns.ALERTED_DATE, // 提醒日期
            NoteColumns.BG_COLOR_ID, // 背景颜色 ID
            NoteColumns.CREATED_DATE, // 创建日期
            NoteColumns.HAS_ATTACHMENT, // 是否有附件
            NoteColumns.MODIFIED_DATE, // 修改日期
            NoteColumns.NOTES_COUNT, // 笔记内容数量
            NoteColumns.PARENT_ID, // 父笔记 ID
            NoteColumns.SNIPPET, // 笔记内容的摘录
            NoteColumns.TYPE, // 笔记类型
            NoteColumns.WIDGET_ID, // 小部件 ID
            NoteColumns.WIDGET_TYPE, // 小部件类型
            NoteColumns.SYNC_ID, // 同步 ID
            NoteColumns.LOCAL_MODIFIED, // 本地修改标记
            NoteColumns.ORIGIN_PARENT_ID, // 原始父笔记 ID
            NoteColumns.GTASK_ID, // Google 任务 ID
            NoteColumns.VERSION // 笔记版本
    };

    // 每一列在查询返回的 Cursor 中的索引
    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;

    // 上下文和内容解析器，提供与系统服务的交互接口
    private Context mContext;
    private ContentResolver mContentResolver;

    // 是否是新创建的笔记
    private boolean mIsCreate;

    // 笔记的各类数据成员
    private long mId;
    private long mAlertDate;
    private int mBgColorId;
    private long mCreatedDate;
    private int mHasAttachment;
    private long mModifiedDate;
    private long mParentId;
    private String mSnippet;
    private int mType;
    private int mWidgetId;
    private int mWidgetType;
    private long mOriginParent;
    private long mVersion;

    // 保存笔记的差异数据
    private ContentValues mDiffNoteValues;

    // 存储与笔记相关的数据列表
    private ArrayList<SqlData> mDataList;
}

// 构造函数：用于创建一个新笔记对象，初始化其成员变量
public SqlNote(Context context) {
    // 初始化上下文和内容解析器，用于访问应用的内容提供者
    mContext = context;
    mContentResolver = context.getContentResolver();

    // 标记这是一个新创建的笔记
    mIsCreate = true;

    // 初始化各个成员变量，设置默认值
    mId = INVALID_ID; // 默认的无效ID
    mAlertDate = 0; // 默认没有提醒
    mBgColorId = ResourceParser.getDefaultBgId(context); // 获取默认背景颜色
    mCreatedDate = System.currentTimeMillis(); // 设置为当前时间戳
    mHasAttachment = 0; // 默认没有附件
    mModifiedDate = System.currentTimeMillis(); // 设置为当前时间戳
    mParentId = 0; // 默认父ID为0
    mSnippet = ""; // 默认笔记摘录为空字符串
    mType = Notes.TYPE_NOTE; // 默认笔记类型为普通笔记
    mWidgetId = AppWidgetManager.INVALID_APPWIDGET_ID; // 默认小部件ID无效
    mWidgetType = Notes.TYPE_WIDGET_INVALIDE; // 默认小部件类型无效
    mOriginParent = 0; // 默认原始父ID为0
    mVersion = 0; // 默认版本为0
    mDiffNoteValues = new ContentValues(); // 用于存储笔记差异的ContentValues
    mDataList = new ArrayList<SqlData>(); // 初始化数据列表，用于存储与笔记相关的数据
}

// 构造函数：用于从数据库中的Cursor加载现有笔记对象
public SqlNote(Context context, Cursor c) {
    // 初始化上下文和内容解析器
    mContext = context;
    mContentResolver = context.getContentResolver();

    // 标记这是一个已存在的笔记
    mIsCreate = false;

    // 从Cursor中加载数据
    loadFromCursor(c);

    // 初始化数据列表
    mDataList = new ArrayList<SqlData>();

    // 如果是普通笔记，加载相关的数据内容
    if (mType == Notes.TYPE_NOTE) {
        loadDataContent();
    }

    // 初始化差异数据的ContentValues
    mDiffNoteValues = new ContentValues();
}

// 构造函数：用于根据笔记ID从数据库加载笔记数据
public SqlNote(Context context, long id) {
    // 初始化上下文和内容解析器
    mContext = context;
    mContentResolver = context.getContentResolver();

    // 标记这是一个已存在的笔记
    mIsCreate = false;

    // 根据ID加载数据
    loadFromCursor(id);

    // 初始化数据列表
    mDataList = new ArrayList<SqlData>();

    // 如果是普通笔记，加载相关的数据内容
    if (mType == Notes.TYPE_NOTE) {
        loadDataContent();
    }

    // 初始化差异数据的ContentValues
    mDiffNoteValues = new ContentValues();
}

// 私有方法：根据笔记ID加载数据，执行数据库查询，返回指定笔记的Cursor
private void loadFromCursor(long id) {
    Cursor c = null;
    try {
        // 通过ID查询笔记数据
        c = mContentResolver.query(Notes.CONTENT_NOTE_URI, PROJECTION_NOTE, "(_id=?)",
                new String[] {
                    String.valueOf(id)
                }, null);

        // 如果查询结果不为空，移动Cursor到下一行并加载数据
        if (c != null) {
            c.moveToNext();
            loadFromCursor(c); // 从Cursor加载数据到当前对象
        } else {
            Log.w(TAG, "loadFromCursor: cursor = null"); // 如果Cursor为空，打印警告
        }
    } finally {
        // 查询完成后关闭Cursor
        if (c != null)
            c.close();
    }
}

// 私有方法：从Cursor中加载数据，将数据映射到当前对象的成员变量
private void loadFromCursor(Cursor c) {
    // 根据列的索引从Cursor中获取数据并赋值给相应的成员变量
    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);
}

// 私有方法：加载与笔记相关的数据内容，查询笔记的附加数据并存储在 mDataList 中
private void loadDataContent() {
    Cursor c = null;
    mDataList.clear(); // 清空当前数据列表
    try {
        // 根据笔记ID查询相关的数据内容
        c = mContentResolver.query(Notes.CONTENT_DATA_URI, SqlData.PROJECTION_DATA,
                "(note_id=?)", new String[] {
                    String.valueOf(mId)
                }, null);

        // 如果查询结果不为空，处理数据
        if (c != null) {
            if (c.getCount() == 0) {
                Log.w(TAG, "it seems that the note has not data"); // 如果没有数据，打印警告
                return;
            }

            // 遍历查询结果，将每一条数据加入到数据列表
            while (c.moveToNext()) {
                SqlData data = new SqlData(mContext, c);
                mDataList.add(data);
            }
        } else {
            Log.w(TAG, "loadDataContent: cursor = null"); // 如果Cursor为空，打印警告
        }
    } finally {
        // 查询完成后关闭Cursor
        if (c != null)
            c.close();
    }
}
   // 设置笔记内容的方法
public boolean setContent(JSONObject js) {
    try {
        // 从传入的JSONObject中获取笔记对象
        JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
        // 检查笔记类型是否为系统笔记，如果是，则打印警告日志
        if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_SYSTEM) {
            Log.w(TAG, "cannot set system folder");
        } else if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_FOLDER) {
            // 如果是文件夹类型，只能更新摘要和类型
            // 更新摘要
            String snippet = note.has(NoteColumns.SNIPPET) ? note
                    .getString(NoteColumns.SNIPPET) : "";
            if (mIsCreate || !mSnippet.equals(snippet)) {
                mDiffNoteValues.put(NoteColumns.SNIPPET, snippet);
            }
            mSnippet = snippet;

            // 更新类型
            int type = note.has(NoteColumns.TYPE) ? note.getInt(NoteColumns.TYPE)
                    : Notes.TYPE_NOTE;
            if (mIsCreate || mType != type) {
                mDiffNoteValues.put(NoteColumns.TYPE, type);
            }
            mType = type;
        } else if (note.getInt(NoteColumns.TYPE) == Notes.TYPE_NOTE) {
            // 如果是普通笔记类型，更新笔记的各种属性
            JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
            long id = note.has(NoteColumns.ID) ? note.getLong(NoteColumns.ID) : INVALID_ID;
            // 更新ID
            if (mIsCreate || mId != id) {
                mDiffNoteValues.put(NoteColumns.ID, id);
            }
            mId = id;

            // 更新提醒日期
            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;

            // 更新背景颜色ID
            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;

            // 更新创建日期
            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;

            // 更新是否有附件
            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;

            // 更新修改日期
            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;

            // 更新父ID
            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;

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

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

            // 更新小部件ID
            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;

            // 更新小部件类型
            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;

            // 更新原始父ID
            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;

            // 更新数据内容
            for (int i = 0; i < dataArray.length(); i++) {
                JSONObject data = dataArray.getJSONObject(i);
                SqlData sqlData = null;
                if (data.has(DataColumns.ID)) {
                    long dataId = data.getLong(DataColumns.ID);
                    for (SqlData temp : mDataList) {
                        if (dataId == temp.getId()) {
                            sqlData = temp;
                        }
                    }
                }

                if (sqlData == null) {
                    sqlData = new SqlData(mContext);
                    mDataList.add(sqlData);
                }

                sqlData.setContent(data);
            }
        }
    } catch (JSONException e) {
        Log.e(TAG, e.toString());
        e.printStackTrace();
        return false;
    }
    return true;
}

// 获取笔记内容的方法
public JSONObject getContent() {
    try {
        JSONObject js = new JSONObject();

        if (mIsCreate) {
            Log.e(TAG, "it seems that we haven't created this in database yet");
            return null;
        }

        JSONObject note = new JSONObject();
        if (mType == Notes.TYPE_NOTE) {
            // 如果是普通笔记类型，构建包含所有属性的JSONObject
            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);

            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);
        } else if (mType == Notes.TYPE_FOLDER || mType == Notes.TYPE_SYSTEM) {
            // 如果是文件夹或系统笔记类型，构建包含ID、类型和摘要的JSONObject
            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;
}

// 设置笔记的父ID
public void setParentId(long id) {
    mParentId = id;
    mDiffNoteValues.put(NoteColumns.PARENT_ID, id);
}

// 设置笔记的GTask ID
public void setGtaskId(String gid) {
    mDiffNoteValues.put(NoteColumns.GTASK_ID, gid);
}

// 设置笔记的同步ID
public void setSyncId(long syncId) {
    mDiffNoteValues.put(NoteColumns.SYNC_ID, syncId);
}

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

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

// 获取笔记的父ID
public long getParentId() {
    return mParentId;
}

// 获取笔记的摘要
public String getSnippet() {
    return mSnippet;
}

// 检查笔记是否为普通笔记类型
public boolean isNoteType() {
        return mType == Notes.TYPE_NOTE;
}

// 提交笔记数据，包括创建和更新
public void commit(boolean validateVersion) {
if (mIsCreate) {
// 如果是创建笔记，插入数据到数据库并获取新创建的笔记ID
if (mId == INVALID_ID && mDiffNoteValues.containsKey(NoteColumns.ID)) {
mDiffNoteValues.remove(NoteColumns.ID);
}

    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");
    }
    if (mId == 0) {
        throw new IllegalStateException("Create thread id failed");
    }

    if (mType == Notes.TYPE_NOTE) {
        // 如果是普通笔记类型，提交关联的数据内容
        for (SqlData sqlData : mDataList) {
            sqlData.commit(mId, false, -1);
        }
    }
} else {
    // 如果是更新笔记，检查ID是否有效
    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");
    }
    if (mDiffNoteValues.size() > 0) {
        mVersion ++;
        // 更新数据库中的笔记数据
        int result = 0;
        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)
                    });
        }
        if (result == 0) {
            Log.w(TAG, "there is no update. maybe user updates note when syncing");
        }
    }

    if (mType == Notes.TYPE_NOTE) {
        // 如果是普通笔记类型，提交关联的数据内容
        for (SqlData sqlData : mDataList) {
            sqlData.commit(mId, validateVersion, mVersion);
        }
    }
}

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

mDiffNoteValues.clear();
mIsCreate = false;
}