#include "parsebackuplist.h"
#include <QFile>
#include <QTextStream>
#include <QXmlStreamReader>
#include <QDebug>
#include <algorithm>

/*
<?xml version='1.0'?>
<backupList>
     <BackupPoint>
          <Comment>21-07-21 14:14:01</Comment>
          <Time>21-07-21 14:14:03</Time>
          <Uuid>{beecb746-561f-4fa1-99ba-19fb849a1ba7}</Uuid>
          <Size>24.26KB</Size>
          <State>backup finished</State>
          <Type>2</Type>
          <Position>0</Position>
          <UserId>1000</UserId>
     </BackupPoint>
</backupList>
*/

#define BACKUPLIST "backupList"
#define BACKUPPOINT "BackupPoint"
#define COMMENT "Comment"
#define TIME "Time"
#define UUID "Uuid"
#define SIZE "Size"
#define STATE "State"
#define TYPE "Type"
#define POSITION "Position"
#define USERID "UserId"
#define OS "OS"
#define ARCH "Arch"
#define ARCHDETECT "ArchDetect"

#define STATUE_BACKUP_FINESHED "backup finished"

ParseBackupList::ParseBackupList(const QString& xmlPath)
    : m_xmlPath(xmlPath)
{
    QFile xmlFile(m_xmlPath);
    if (!xmlFile.exists() || 0 == xmlFile.size()) {
        InitXml();
    }
}

/**
 * @brief 初始化xml文件
 * @return
 */
bool ParseBackupList::InitXml()
{
    QFile xmlFile(m_xmlPath);
    if (!xmlFile.open(QIODevice::ReadWrite | QIODevice::Truncate))
        return false;

    QDomDocument doc;

    QDomProcessingInstruction ins = doc.createProcessingInstruction("xml", "version=\'1.0\'");
    doc.appendChild(ins);

    QDomElement root = doc.createElement(BACKUPLIST);
    doc.appendChild(root);

    QTextStream out(&xmlFile);
    doc.save(out, QDomNode::NodeType::CDATASectionNode);

    xmlFile.close();
    return true;
}

/**
 * @brief 校验xml格式是否正确
 * @return
 */
bool ParseBackupList::isXmlCorrect()
{
    QFile xmlFile(m_xmlPath);
    if (!xmlFile.open(QIODevice::ReadOnly | QIODevice::Text)) {
        qDebug() << "Open file " << m_xmlPath << " failure";
        return false;
    }
    QXmlStreamReader reader(&xmlFile);
    while (!reader.atEnd()) {
        if (reader.isStartElement()) {
        }
        reader.readNext();
    }
    if (reader.hasError()) {
        qDebug() << "xml parse error!";
        xmlFile.close();
        return false;
    }
    xmlFile.close();
    return true;
}

/**
 * @brief 读取xml文件
 * @param doc
 * @return
 */
bool ParseBackupList::Doc_setContent(QDomDocument& doc)
{
    QFile xmlFile(m_xmlPath);
    if (!xmlFile.open(QIODevice::ReadOnly)) {
        qDebug() << "open backuplist.xml failed!";
        return false;
    }
    QString errStr;
    int errLine;
    int errCol;

    if (!doc.setContent(&xmlFile, false, &errStr, &errLine, &errCol)) {
        qDebug() << QString("parse backuplist.xml error at line %1, column %2:%3").arg(errLine).arg(errCol).arg(errStr);
        xmlFile.close();
        return false;
    }
    xmlFile.close();
    return true;
}

/**
 * @brief ParseBackupList::BackupPoint::operator <
 * @param other
 * @return
 */
bool ParseBackupList::BackupPoint::operator < (const BackupPoint &other)
{
    return other.m_time > this->m_time;
}

/**
 * @brief 出厂备份修改backuplist.xml，仅保留出厂备份信息
 * @param factoryBackupUuid，出厂备份的uuid
 * @return ParseResult枚举类型
 * @author zhaominyong
 * @since 2021/06/27
 */
ParseBackupList::ParseResult ParseBackupList::updateForFactoryRestore(const QString& factoryBackupUuid)
{
    QDomDocument doc;
    if (!Doc_setContent(doc))
        return XML_PARSE_ERR;

    QDomElement root = doc.documentElement();
    QDomNodeList list = root.childNodes();

    for (int i = 0; i < list.count(); i++) {
        QDomNode node = list.at(i);
        if (!node.isElement())
            continue ;
        QDomElement element = node.toElement();
        QDomNodeList nodes = element.elementsByTagName(UUID);
        if (0 < nodes.count()) {
            QDomElement uuidElement = nodes.at(0).toElement();
            QString tag = uuidElement.tagName();
            QString text = uuidElement.text();
            if (uuidElement.text() != factoryBackupUuid) {
                root.removeChild(node);
                --i;
            }
        }
    }

    QFile xmlFile(m_xmlPath);
    if (!xmlFile.open(QIODevice::WriteOnly)) {
        qDebug() << "update state failed";
        return FAIL;
    }
    QTextStream out(&xmlFile);
    doc.save(out, QDomNode::NodeType::EntityReferenceNode);
    out.flush();
    xmlFile.close();
    return SUCCESS;
}

/**
 * @brief 根据comment查找uuid
 * @param comment
 * @return uuid
 */
QString ParseBackupList::findUuidByComment(const QString& comment)
{
    QDomDocument doc;
    if (!Doc_setContent(doc))
        return "";

    QDomElement root = doc.documentElement();
    QDomNodeList list = root.childNodes();

    for (int i = 0; i < list.count(); i++) {
        QDomNode node = list.at(i);
        if (!node.isElement())
            continue;

        QDomElement eleComment = node.firstChildElement(COMMENT);
        if (eleComment.isNull())
            continue;

        if (comment != eleComment.text())
            continue;

        QDomElement eleUuid = node.firstChildElement(UUID);
        if (eleUuid.isNull())
            return "";

        return eleUuid.text();
    }

    return "";
}

/**
 * @brief 根据Uuid查找备份点信息
 * @param Uuid
 * @return 备份点信息
 */
ParseBackupList::BackupPoint ParseBackupList::findBackupPointByUuid(const QString& Uuid)
{
    BackupPoint backupPoint;
    QDomDocument doc;
    if (!Doc_setContent(doc))
        return backupPoint;

    QDomElement root = doc.documentElement();
    QDomNodeList list = root.childNodes();

    for (int i = 0; i < list.count(); i++) {
        QDomNode node = list.at(i);
        if (!node.isElement())
            continue;

        QDomElement eleUuid = node.firstChildElement(UUID);
        if (eleUuid.isNull() || Uuid != eleUuid.text())
            continue;

        elementNodeToBackupPoint(node.toElement(), backupPoint);
        return backupPoint;
    }

    return backupPoint;
}

/**
 * @brief 获取最后一次系统备份，排除自动备份点
 * @return
 */
ParseBackupList::BackupPoint ParseBackupList::getLastSysBackupPoint()
{
    BackupPoint backupPoint;
    QDomDocument doc;
    if (!Doc_setContent(doc))
        return backupPoint;

    QDomElement root = doc.documentElement();
    QDomNodeList list = root.childNodes();

    for (int i = 0; i < list.count(); i++) {
        QDomNode node = list.at(i);
        if (!node.isElement())
            continue;

        QDomElement eleType = node.firstChildElement(TYPE);
        if (eleType.isNull() || (BackupType::BACKUP_SYSTEM != eleType.text().toInt() && BackupType::INC_BACKUP_SYSTEM != eleType.text().toInt()))
            continue;

        QDomElement eleUuid = node.firstChildElement(UUID);
        if (eleUuid.isNull() || eleUuid.text() == AUTO_BACKUP_UUID)
            continue;

        QDomElement eleState = node.firstChildElement(STATE);
        QString type = eleState.text();
        if (eleState.isNull() || eleState.text() != QString(STATUE_BACKUP_FINESHED))
            continue;

        elementNodeToBackupPoint(node.toElement(), backupPoint);
    }

    return backupPoint;
}

/**
 * @brief elementNode --> BackupPoint
 * @param node, QDomElement
 * @param backupPoint, BackupPoint
 */
void ParseBackupList::elementNodeToBackupPoint(const QDomElement& node, BackupPoint& backupPoint)
{
    QDomElement eleUuid = node.firstChildElement(UUID);
    if (!eleUuid.isNull())
        backupPoint.m_uuid = eleUuid.text();

    QDomElement eleComment = node.firstChildElement(COMMENT);
    if (!eleComment.isNull())
        backupPoint.m_backupName = eleComment.text();

    QDomElement eleTime = node.firstChildElement(TIME);
    if (!eleTime.isNull())
        backupPoint.m_time = eleTime.text();

    QDomElement eleSize = node.firstChildElement(SIZE);
    if (!eleSize.isNull())
        backupPoint.m_size = eleSize.text();

    QDomElement eleState = node.firstChildElement(STATE);
    if (!eleState.isNull())
        backupPoint.m_state = eleState.text();

    QDomElement eleType = node.firstChildElement(TYPE);
    if (!eleType.isNull())
        backupPoint.m_type = eleType.text().toInt();

    QDomElement elePosition = node.firstChildElement(POSITION);
    if (!elePosition.isNull() && !elePosition.text().isEmpty())
        backupPoint.m_iPosition = elePosition.text().toInt();

    QDomElement eleUserId = node.firstChildElement(USERID);
    if (!eleUserId.isNull())
        backupPoint.m_userId = eleUserId.text();

    QDomElement eleOS = node.firstChildElement(OS);
    if (!eleOS.isNull())
        backupPoint.m_os = eleOS.text();

    QDomElement eleArch = node.firstChildElement(ARCH);
    if (!eleArch.isNull())
        backupPoint.m_arch = eleArch.text();

    QDomElement eleArchDetect = node.firstChildElement(ARCHDETECT);
    if (!eleArchDetect.isNull())
        backupPoint.m_archdetect = eleArchDetect.text();

    backupPoint.m_path = m_xmlPath;
    backupPoint.m_path.replace(BACKUP_XML_PATH, "");
}

/**
 * @brief backupPoint --> ElementNode
 * @param backupPoint, BackupPoint
 * @param node, QDomElement
 */
void ParseBackupList::backupPointToElementNode(const BackupPoint& backupPoint, QDomDocument& doc, QDomNode& node)
{
    node.appendChild(createTextElement(doc, COMMENT, backupPoint.m_backupName));
    node.appendChild(createTextElement(doc, TIME, backupPoint.m_time));
    node.appendChild(createTextElement(doc, UUID, backupPoint.m_uuid));
    node.appendChild(createTextElement(doc, SIZE, backupPoint.m_size));
    node.appendChild(createTextElement(doc, STATE, backupPoint.m_state));
    node.appendChild(createTextElement(doc, TYPE, QString::number(backupPoint.m_type)));
    node.appendChild(createTextElement(doc, POSITION, QString::number(backupPoint.m_iPosition)));
    if (!backupPoint.m_userId.isEmpty()) {
        node.appendChild(createTextElement(doc, USERID, backupPoint.m_userId));
    }
    if (!backupPoint.m_os.isEmpty()) {
        node.appendChild(createTextElement(doc, OS, backupPoint.m_os));
    }
    if (!backupPoint.m_arch.isEmpty()) {
        node.appendChild(createTextElement(doc, ARCH, backupPoint.m_arch));
    }
    if (!backupPoint.m_archdetect.isEmpty()) {
        node.appendChild(createTextElement(doc, ARCHDETECT, backupPoint.m_archdetect));
    }
}

/**
 * @brief createTextElement
 * @param tagName
 * @param text
 * @return <tagName>text</tagName>
 */
QDomElement ParseBackupList::createTextElement(QDomDocument& doc, const QString& tagName, const QString& text)
{
    QDomElement node = doc.createElement(tagName);
    QDomText textNode = doc.createTextNode(text);
    node.appendChild(textNode);

    return node;
}

/**
 * @brief 新增备份节点
 * @param backupPoint, 备份点信息
 * @return SUCCESS成功； XML_PARSE_ERR失败
 */
ParseBackupList::ParseResult ParseBackupList::addItem(const BackupPoint& backupPoint)
{
    QDomDocument doc;
    if (!Doc_setContent(doc))
        return XML_PARSE_ERR;

    QDomElement backupPointNode = doc.createElement(BACKUPPOINT);
    backupPointToElementNode(backupPoint, doc, backupPointNode);

    QDomElement root = doc.documentElement();
    root.appendChild(backupPointNode);

    QFile xmlFile(m_xmlPath);
    if (!xmlFile.open(QIODevice::WriteOnly | QIODevice::Truncate))
        return FAIL;

    QTextStream out(&xmlFile);
    doc.save(out, QDomNode::NodeType::CDATASectionNode);
    xmlFile.close();
    return SUCCESS;
}

/**
 * @brief 更新备份点信息
 * @param backupPoint，新的备份点信息
 * @return SUCCESS成功； XML_PARSE_ERR失败
 */
ParseBackupList::ParseResult ParseBackupList::updateItem(const BackupPoint & backupPoint)
{
    QDomDocument doc;
    if (!Doc_setContent(doc))
        return XML_PARSE_ERR;

    QDomElement root = doc.documentElement();
    QDomNodeList list = root.childNodes();

    for (int i = 0; i < list.count(); i++) {
        QDomNode node = list.at(i);
        if (!node.isElement())
            continue;

        QDomElement eleUuid = node.firstChildElement(UUID);
        if (eleUuid.isNull() || backupPoint.m_uuid != eleUuid.text())
            continue;

        QDomElement newNode = doc.createElement(BACKUPPOINT);
        backupPointToElementNode(backupPoint, doc, newNode);
        root.replaceChild(newNode, node);

        break ;
    }

    QFile xmlFile(m_xmlPath);
    if (!xmlFile.open(QIODevice::WriteOnly | QIODevice::Truncate)) {
        return FAIL;
    }

    QTextStream out(&xmlFile);
    doc.save(out, QDomNode::NodeType::EntityReferenceNode);
    xmlFile.close();
    return SUCCESS;
}

/**
 * @brief 删除备份点记录
 * @param uuid
 * @return SUCCESS成功； XML_PARSE_ERR失败
 */
ParseBackupList::ParseResult ParseBackupList::deleteItem(const QString& uuid)
{
    QDomDocument doc;
    if (!Doc_setContent(doc))
        return XML_PARSE_ERR;

    QDomElement root = doc.documentElement();
    QDomNodeList list = root.childNodes();

    for (int i = 0; i < list.count(); i++) {
        QDomNode node = list.at(i);
        if (!node.isElement())
            continue;

        QDomElement eleUuid = node.firstChildElement(UUID);
        if (eleUuid.isNull() || uuid != eleUuid.text())
            continue;

        root.removeChild(node);

        break ;
    }

    QFile xmlFile(m_xmlPath);
    if (!xmlFile.open(QIODevice::WriteOnly | QIODevice::Truncate)) {
        return FAIL;
    }

    QTextStream out(&xmlFile);
    doc.save(out, QDomNode::NodeType::EntityReferenceNode);
    xmlFile.close();
    return SUCCESS;
}

/**
 * @brief 获取备份列表
 * @return
 */
QList<ParseBackupList::BackupPoint> ParseBackupList::getBackupPointList()
{
    QList<ParseBackupList::BackupPoint> backupPointList;
    QDomDocument doc;
    if (!Doc_setContent(doc))
        return backupPointList;

    QDomElement root = doc.documentElement();
    QDomNodeList list = root.childNodes();

    for (int i = 0; i < list.count(); i++) {
        QDomNode node = list.at(i);
        if (!node.isElement())
            continue;

        QDomElement eleUuid = node.firstChildElement(UUID);
        if (eleUuid.isNull())
            continue;

        BackupPoint backupPoint;
        elementNodeToBackupPoint(node.toElement(), backupPoint);
        backupPointList << backupPoint;
    }

    // std::sort(backupPointList.begin(), backupPointList.end());

    return backupPointList;
}