/*
 * Copyright (C) 2020, KylinSoft Co., Ltd.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 *
 * Authors: zhangzihao <zhangzihao@kylinos.cn>
 * Modified by: zhangpengfei <zhangpengfei@kylinos.cn>
 *
 */
//#include <QtConcurrent>
#include "first-index.h"
#include <QDebug>

#define NEW_QUEUE(a) a = new QQueue<QString>(); qDebug("---------------------------%s %s %s new at %d..",__FILE__,__FUNCTION__,#a,__LINE__);
//#define DELETE_QUEUE(a )

FirstIndex::FirstIndex(const QString& path) : Traverse_BFS(path)
{
    QString indexDataBaseStatus =  GlobalSettings::getInstance()->getValue(INDEX_DATABASE_STATE).toString();
    QString contentIndexDataBaseStatus = GlobalSettings::getInstance()->getValue(CONTENT_INDEX_DATABASE_STATE).toString();
    QString inotifyIndexStatus = GlobalSettings::getInstance()->getValue(INOTIFY_NORMAL_EXIT).toString();

    qDebug() << "indexDataBaseStatus: " << indexDataBaseStatus;
    qDebug() << "contentIndexDataBaseStatus: " << contentIndexDataBaseStatus;
    qDebug() << "inotifyIndexStatus: " << inotifyIndexStatus;


    if (indexDataBaseStatus == "" || contentIndexDataBaseStatus == ""){
        this->bool_dataBaseExist = false;
    }
    else{
        this->bool_dataBaseExist = true;
    }
    if (indexDataBaseStatus != "2" || contentIndexDataBaseStatus != "2" || inotifyIndexStatus != "2"){
        this->bool_dataBaseStatusOK = false;
    }
    else{
        this->bool_dataBaseStatusOK = true;
    }

    this->q_index = new QQueue<QVector<QString>>();
    //this->q_content_index = new QQueue<QString>();
    NEW_QUEUE(this->q_content_index);
//    this->mlm = new MessageListManager();
}

FirstIndex::~FirstIndex()
{
    qDebug() << "~FirstIndex";
    if(this->q_index)
        delete this->q_index;
    this->q_index = nullptr;
    if(this->q_content_index)
        delete this->q_content_index;
    this->q_content_index = nullptr;
    if (this->p_indexGenerator)
        delete this->p_indexGenerator;
    this->p_indexGenerator = nullptr;
    qDebug() << "~FirstIndex end";
//    delete this->mlm;
//    this->mlm = nullptr;
}

void FirstIndex::DoSomething(const QFileInfo& fileInfo){
//    qDebug() << "there are some shit here"<<fileInfo.fileName() << fileInfo.absoluteFilePath() << QString(fileInfo.isDir() ? "1" : "0");
    this->q_index->enqueue(QVector<QString>() << fileInfo.fileName() << fileInfo.absoluteFilePath() << QString((fileInfo.isDir() && (!fileInfo.isSymLink())) ? "1" : "0"));
    if ((!fileInfo.fileName().split(".").isEmpty()) && (true == targetFileTypeMap[fileInfo.fileName().split(".").last()])){
        this->q_content_index->enqueue(fileInfo.absoluteFilePath());
    }
}

void FirstIndex::run(){
    QTime t1 = QTime::currentTime();

    int fifo_fd;
    char buffer[2];
    memset(buffer, 0, sizeof(buffer));
    buffer[0] = 0x1;
    buffer[1] = '\0';
    fifo_fd = open(UKUI_SEARCH_PIPE_PATH, O_RDWR);
    if(fifo_fd == -1)
    {
        perror("open fifo error\n");
        assert(false);
    }

//    this->q_content_index->enqueue(QString("/home/zhangzihao/Desktop/qwerty/四库全书.txt"));

//    this->p_indexGenerator->creatAllIndex(this->q_content_index);


    ++FileUtils::_index_status;

    pid_t pid;
    pid = fork();
    if(pid  == 0)
    {
        prctl(PR_SET_PDEATHSIG, SIGTERM);
        prctl(PR_SET_NAME,"first-index");
        if (this->bool_dataBaseExist){
            if (this->bool_dataBaseStatusOK){
                ::_exit(0);
            }
            else{
                //if the parameter is false, index won't be rebuild
                //if it is true, index will be rebuild
                p_indexGenerator = IndexGenerator::getInstance(true,this);
            }
        }
        else{
//            p_indexGenerator = IndexGenerator::getInstance(false,this);
            p_indexGenerator = IndexGenerator::getInstance(true,this);

        }
        QSemaphore sem(5);
        QMutex mutex1, mutex2, mutex3;
        mutex1.lock();
        mutex2.lock();
        mutex3.lock();
        sem.acquire(4);
        QtConcurrent::run([&](){
            sem.acquire(1);
            mutex1.unlock();
            this->setPath(QStandardPaths::writableLocation(QStandardPaths::HomeLocation));
            this->Traverse();
            FileUtils::_max_index_count = this->q_index->length();
            qDebug()<<"max_index_count:"<<FileUtils::_max_index_count;
            sem.release(5);
        });
        QtConcurrent::run([&](){
            sem.acquire(2);
            mutex2.unlock();
            qDebug() << "index start;";
            QQueue<QVector<QString>>* tmp = new QQueue<QVector<QString>>();
            while (!this->q_index->empty()) {
                for (size_t i = 0; (i < 8192) && (!this->q_index->empty()); ++i){
                    tmp->enqueue(this->q_index->dequeue());
                }
                this->p_indexGenerator->creatAllIndex(tmp);
                tmp->clear();
            }
//            this->p_indexGenerator->setSynonym();
            delete tmp;
            qDebug() << "index end;";
            sem.release(2);
        });
        QtConcurrent::run([&](){
            sem.acquire(2);
            mutex3.unlock();
            QQueue<QString>* tmp = new QQueue<QString>();
            qDebug()<<"q_content_index:"<<q_content_index->size();
            while (!this->q_content_index->empty()) {
//                for (size_t i = 0; (i < this->u_send_length) && (!this->q_content_index->empty()); ++i){
                for (size_t i = 0; (i < 30) && (!this->q_content_index->empty()); ++i){
                    tmp->enqueue(this->q_content_index->dequeue());
                }
                this->p_indexGenerator->creatAllIndex(tmp);
                tmp->clear();
            }
            delete tmp;
            qDebug() << "content index end;";
            sem.release(2);
        });
        mutex1.lock();
        mutex2.lock();
        mutex3.lock();
        sem.acquire(5);
        mutex1.unlock();
        mutex2.unlock();
        mutex3.unlock();

        if (this->q_index)
            delete this->q_index;
        this->q_index = nullptr;
        if (this->q_content_index)
            delete this->q_content_index;
        this->q_content_index = nullptr;
        if (p_indexGenerator)
            delete p_indexGenerator;
        p_indexGenerator = nullptr;
        GlobalSettings::getInstance()->forceSync();
        ::_exit(0);
    }
    else if(pid < 0)
    {
        qWarning()<<"First Index fork error!!";
    }
    else
    {
        waitpid(pid,NULL,0);
        --FileUtils::_index_status;
    }


    GlobalSettings::getInstance()->setValue(INOTIFY_NORMAL_EXIT, "2");
    int retval = write(fifo_fd, buffer, strlen(buffer));
    if(retval == -1)
    {
        qWarning("write error\n");
    }
    qDebug("write data ok!\n");
    QTime t2 = QTime::currentTime();
    qWarning() << t1;
    qWarning() << t2;

    return;

}