/*
 * 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.text.TextUtils;
import android.util.Log;

import net.micode.notes.data.Notes;
import net.micode.notes.data.Notes.DataColumns;
import net.micode.notes.data.Notes.DataConstants;
import net.micode.notes.data.Notes.NoteColumns;
import net.micode.notes.gtask.exception.ActionFailureException;
import net.micode.notes.tool.GTaskStringUtils;

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


public class Task extends Node {
    private static final String TAG = Task.class.getSimpleName();
    private boolean mCompleted;       // 任务完成状态
    private String mNotes;            // 任务备注
    private JSONObject mMetaInfo;     // 元数据（存储本地笔记与GTask的映射）
    private Task mPriorSibling;       // 前一个兄弟任务（用于排序）
    private TaskList mParent;         // 所属任务列表

    // 构造函数：初始化任务属性
    public Task() {
        super();
        mCompleted = false;
        mNotes = null;
        mPriorSibling = null;
        mParent = null;
        mMetaInfo = null;
    }

    // 生成创建任务的JSON请求
    public JSONObject getCreateAction(int actionId) {
        JSONObject js = new JSONObject();
        try {
            js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE, "create");       // 动作类型
            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId);         // 动作ID
            js.put(GTaskStringUtils.GTASK_JSON_INDEX, mParent.getChildTaskIndex(this)); // 排序索引
            // 任务实体数据
            JSONObject entity = new JSONObject();
            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName());         // 任务名称
            entity.put(GTaskStringUtils.GTASK_JSON_ENTITY_TYPE, "task");     // 实体类型
            if (getNotes() != null) entity.put(GTaskStringUtils.GTASK_JSON_NOTES, getNotes());
            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
            // 父任务列表信息
            js.put(GTaskStringUtils.GTASK_JSON_PARENT_ID, mParent.getGid());
            js.put(GTaskStringUtils.GTASK_JSON_LIST_ID, mParent.getGid());
            // 前一个兄弟任务ID（用于排序）
            if (mPriorSibling != null) {
                js.put(GTaskStringUtils.GTASK_JSON_PRIOR_SIBLING_ID, mPriorSibling.getGid());
            }
        } catch (JSONException e) {
            throw new ActionFailureException("生成创建任务JSON失败");
        }
        return js;
    }

    // 生成更新任务的JSON请求
    public JSONObject getUpdateAction(int actionId) {
        JSONObject js = new JSONObject();
        try {
            js.put(GTaskStringUtils.GTASK_JSON_ACTION_TYPE, "update");       // 动作类型
            js.put(GTaskStringUtils.GTASK_JSON_ACTION_ID, actionId);         // 动作ID
            js.put(GTaskStringUtils.GTASK_JSON_ID, getGid());                // 任务ID
            // 任务实体数据（仅更新变更字段）
            JSONObject entity = new JSONObject();
            entity.put(GTaskStringUtils.GTASK_JSON_NAME, getName());
            if (getNotes() != null) entity.put(GTaskStringUtils.GTASK_JSON_NOTES, getNotes());
            entity.put(GTaskStringUtils.GTASK_JSON_DELETED, getDeleted());   // 删除状态
            js.put(GTaskStringUtils.GTASK_JSON_ENTITY_DELTA, entity);
        } catch (JSONException e) {
            throw new ActionFailureException("生成更新任务JSON失败");
        }
        return js;
    }

    // 从远程JSON（GTask数据）设置任务内容
    public void setContentByRemoteJSON(JSONObject js) {
        if (js != null) {
            try {
                setGid(js.getString(GTaskStringUtils.GTASK_JSON_ID));         // 设置GTask ID
                setLastModified(js.getLong(GTaskStringUtils.GTASK_JSON_LAST_MODIFIED)); // 最后修改时间
                setName(js.getString(GTaskStringUtils.GTASK_JSON_NAME));       // 任务名称
                setNotes(js.getString(GTaskStringUtils.GTASK_JSON_NOTES));     // 任务备注
                setDeleted(js.getBoolean(GTaskStringUtils.GTASK_JSON_DELETED)); // 删除状态
                setCompleted(js.getBoolean(GTaskStringUtils.GTASK_JSON_COMPLETED)); // 完成状态
            } catch (JSONException e) {
                throw new ActionFailureException("解析远程JSON失败");
            }
        }
    }

    // 从本地JSON（笔记数据）设置任务内容
    public void setContentByLocalJSON(JSONObject js) {
        if (js == null || !js.has(GTaskStringUtils.META_HEAD_NOTE)) return;
        try {
            JSONObject note = js.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
            JSONArray dataArray = js.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
            // 仅处理普通笔记类型
            if (note.getInt(NoteColumns.TYPE) != Notes.TYPE_NOTE) return;
            // 从数据列表中获取笔记内容作为任务名称
            for (int i = 0; i < dataArray.length(); i++) {
                JSONObject data = dataArray.getJSONObject(i);
                if (data.getString(DataColumns.MIME_TYPE).equals(DataConstants.NOTE)) {
                    setName(data.getString(DataColumns.CONTENT));
                    break;
                }
            }
        } catch (JSONException e) {
            Log.e(TAG, "解析本地JSON失败", e);
        }
    }

    // 从任务内容生成本地JSON（用于存储到本地数据库）
    public JSONObject getLocalJSONFromContent() {
        String name = getName();
        try {
            if (mMetaInfo == null) {
                // 新建任务（无元数据）
                JSONObject js = new JSONObject();
                JSONObject note = new JSONObject();
                JSONArray dataArray = new JSONArray();
                JSONObject data = new JSONObject();
                data.put(DataColumns.CONTENT, name);
                dataArray.put(data);
                js.put(GTaskStringUtils.META_HEAD_DATA, dataArray);
                note.put(NoteColumns.TYPE, Notes.TYPE_NOTE);
                js.put(GTaskStringUtils.META_HEAD_NOTE, note);
                return js;
            } else {
                // 已同步任务（更新元数据）
                JSONObject note = mMetaInfo.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
                JSONArray dataArray = mMetaInfo.getJSONArray(GTaskStringUtils.META_HEAD_DATA);
                for (int i = 0; i < dataArray.length(); i++) {
                    JSONObject data = dataArray.getJSONObject(i);
                    if (data.getString(DataColumns.MIME_TYPE).equals(DataConstants.NOTE)) {
                        data.put(DataColumns.CONTENT, name);
                        break;
                    }
                }
                note.put(NoteColumns.TYPE, Notes.TYPE_NOTE);
                return mMetaInfo;
            }
        } catch (JSONException e) {
            Log.e(TAG, "生成本地JSON失败", e);
            return null;
        }
    }

    // 设置元数据（本地笔记与GTask的映射）
    public void setMetaInfo(MetaData metaData) {
        if (metaData != null && metaData.getNotes() != null) {
            try {
                mMetaInfo = new JSONObject(metaData.getNotes());
            } catch (JSONException e) {
                Log.w(TAG, "解析元数据失败", e);
                mMetaInfo = null;
            }
        }
    }

    // 判断当前同步动作类型
    public int getSyncAction(Cursor c) {
        try {
            if (mMetaInfo == null || !mMetaInfo.has(GTaskStringUtils.META_HEAD_NOTE)) {
                return SYNC_ACTION_UPDATE_REMOTE; // 元数据不存在，需从远程更新
            }
            JSONObject noteInfo = mMetaInfo.getJSONObject(GTaskStringUtils.META_HEAD_NOTE);
            // 验证笔记ID
            if (c.getLong(SqlNote.ID_COLUMN) != noteInfo.getLong(NoteColumns.ID)) {
                return SYNC_ACTION_UPDATE_LOCAL; // ID不匹配，需更新本地
            }
            // 判断本地修改状态
            if (c.getInt(SqlNote.LOCAL_MODIFIED_COLUMN) == 0) {
                // 本地未修改
                if (c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified()) {
                    return SYNC_ACTION_NONE; // 无变更
                } else {
                    return SYNC_ACTION_UPDATE_LOCAL; // 远程有更新，需同步到本地
                }
            } else {
                // 本地已修改
                if (!c.getString(SqlNote.GTASK_ID_COLUMN).equals(getGid())) {
                    return SYNC_ACTION_ERROR; // GTask ID不匹配，错误
                }
                if (c.getLong(SqlNote.SYNC_ID_COLUMN) == getLastModified()) {
                    return SYNC_ACTION_UPDATE_REMOTE; // 本地修改，需同步到远程
                } else {
                    return SYNC_ACTION_UPDATE_CONFLICT; // 本地与远程都有修改，冲突
                }
            }
        } catch (Exception e) {
            Log.e(TAG, "获取同步动作失败", e);
        }
        return SYNC_ACTION_ERROR;
    }

    // 判断任务是否值得保存
    public boolean isWorthSaving() {
        return mMetaInfo != null ||
                (getName() != null && getName().trim().length() > 0) ||
                (getNotes() != null && getNotes().trim().length() > 0);
    }

    // Getter和Setter方法
    public void setCompleted(boolean completed) { this.mCompleted = completed; }
    public void setNotes(String notes) { this.mNotes = notes; }
    public void setPriorSibling(Task priorSibling) { this.mPriorSibling = priorSibling; }
    public void setParent(TaskList parent) { this.mParent = parent; }
    public boolean getCompleted() { return mCompleted; }
    public String getNotes() { return mNotes; }
    public Task getPriorSibling() { return mPriorSibling; }
    public TaskList getParent() { return mParent; }
}