#include "attributeTableModel.h"
#include "logger.h"
#include "sqlQueryExecutor.h"

AttributeTableModel::AttributeTableModel(const ModelAttributeGroup& modelAttributeGroup, QObject* parent, const QString& connection, const QString& tableName)
    : QAbstractTableModel(parent)
    , m_connection(connection)
    , m_tableName(tableName)
    , m_modelAttributeGroup(modelAttributeGroup)
{
    m_paginationInfo.entriesPerPage = 100;
    m_paginationInfo.currentPage = 1;
    m_paginationInfo.totalEntries = 0;

    iniDisplayField();
}

AttributeTableModel::~AttributeTableModel()
{}

QModelIndex AttributeTableModel::index(int row, int column, const QModelIndex& parent) const
{
    if(!hasIndex(row, column, parent))
        return QModelIndex();

    int dataCol = column - 1;
    if(dataCol >= m_displayField.count())
        return QModelIndex();

    return createIndex(row, column);
}

QVariant AttributeTableModel::data(const QModelIndex& index, int role) const
{
    if(!index.isValid())
        return QVariant();

    int row = index.row();
    int col = index.column();
    int globalRow = (m_paginationInfo.currentPage - 1) * m_paginationInfo.entriesPerPage + row;

    if(index.column() == 0) //第一列显示行号
    {
        switch (role)
        {
        case Qt::DisplayRole:
        {
            QString mark;
            if(m_modifiedRows.contains(globalRow))
            {
                switch(m_modifiedRows[globalRow].state)
                {
                case Modified:
                    mark = "*";
                    break;
                case New:
                    mark = "+";
                    break;
                case Deleted:
                    mark = "-";
                    break;
                default:
                    break;
                }
            }
            return QString::number(globalRow + 1) + mark;
        }
        case Qt::DecorationRole:
            return QVariant();
        case Qt::TextAlignmentRole:
            return Qt::AlignCenter; //行号居中展示
        default:
            return QVariant();
        }
    }
    else
    {
        int dataCol = col - 1;
        const RowData& rowData = m_currentPageData[row];
        if (role == Qt::DisplayRole || role == Qt::EditRole)
            //return rowData.record.value(dataCol);
            return rowData.values.value(dataCol);
        else if (role == Qt::UserRole + 100) //以100来标识数据是否被编辑,在相关代理Delegate类实现中同步进行处理（文字加粗等效果）
            return (rowData.state != Clean);
    }

    return QVariant();
}

bool AttributeTableModel::setData(const QModelIndex &index, const QVariant &value, int role)
{
    if (role != Qt::EditRole || index.column() == 0)
        return false;

    // QModelIndex numberIndex = createIndex(index.row(), 0);
    // QString text = numberIndex.data(Qt::DisplayRole).toString();
    // qDebug() << text;
    // if(text.contains("-")) //删除状态不可编辑
    //     return false;

    int row = index.row();
    int globalRow = (m_paginationInfo.currentPage - 1) * m_paginationInfo.entriesPerPage + row;
    int dataCol = index.column() - 1; //第一列显示了行号
    //记录修改
    RowData modifiedRow = m_currentPageData[row];
    //modifiedRow.record.setValue(dataCol, value);
    modifiedRow.values[dataCol] = value;
    modifiedRow.state = (modifiedRow.state == New) ? New : Modified;

    m_modifiedRows[globalRow] = modifiedRow;
    m_currentPageData[row] = modifiedRow;

    emit dataChanged(index, index, {role, Qt::UserRole + 100});
    return true;
}

QVariant AttributeTableModel::headerData(int section, Qt::Orientation orientation, int role) const
{
    if (orientation == Qt::Horizontal && role == Qt::DisplayRole)
    {
        if(section == 0)
            return role == Qt::DisplayRole ? "No." : QVariant();
        else
        {
            QString headerText = m_displayField.value(section - 1).displayName;
            if(!m_displayField.value(section - 1).dataType.isEmpty())
                headerText = headerText + "\n" + m_displayField.value(section - 1).dataType;

            return headerText;
        }
    }
    return QAbstractTableModel::headerData(section, orientation, role);
}

int AttributeTableModel::rowCount(const QModelIndex& parent) const
{
    return m_currentPageData.count();
}

int AttributeTableModel::columnCount(const QModelIndex &) const
{
    return m_displayField.isEmpty() ? 0 : m_displayField.count() + 1;
}

Qt::ItemFlags AttributeTableModel::flags(const QModelIndex &index) const
{
    QModelIndex numberIndex = createIndex(index.row(), 0);
    QString text = numberIndex.data(Qt::DisplayRole).toString();

    Qt::ItemFlags flags = QAbstractTableModel::flags(index);
    if (index.column() != 0 && !text.contains("-")) //行号列和处于删除状态的item不能编辑
        flags = flags | Qt::ItemIsEditable;
    return flags;
}

void AttributeTableModel::iniDisplayField()
{
    FieldInfo field1;
    field1.originalName = "attribute";
    field1.displayName = QString::fromWCharArray(L"属性类别");
    field1.dataType = "character varying(128)";
    m_displayField.append(field1);

    FieldInfo field2;
    field2.originalName = "attribute_name";
    field2.displayName = QString::fromWCharArray(L"属性名称");
    field2.dataType = "character varying(64)";
    m_displayField.append(field2);

    FieldInfo field3;
    field3.originalName = "data_type_id";
    field3.displayName = QString::fromWCharArray(L"数据类型");
    field3.dataType = "bigint";
    m_displayField.append(field3);

    FieldInfo field4;
    field4.originalName = "length_precision";
    field4.displayName = QString::fromWCharArray(L"数据精度");
    field4.dataType = "integer";
    m_displayField.append(field4);

    FieldInfo field5;
    field5.originalName = "default_value";
    field5.displayName = QString::fromWCharArray(L"默认值");
    field5.dataType = "character varying(64)";
    m_displayField.append(field5);
}

void AttributeTableModel::loadPageData()
{
    m_currentPageData.clear();

    if (m_tableName.isEmpty())
    {
        LOG_ERROR("DB", QString("Attribute table name is empty, load data failed"));
        return;
    }

    beginResetModel();

    QStringList columns;
    for(int i = 0; i < m_displayField.count(); i++)
        columns << m_displayField.at(i).originalName;
    QString strSQL = QString("SELECT %1 FROM %2 LIMIT %3 OFFSET %4")
                         .arg(columns.join(", "))
                         .arg(m_tableName)
                         .arg(m_paginationInfo.entriesPerPage)
                         .arg((m_paginationInfo.currentPage - 1) * m_paginationInfo.entriesPerPage);
    try
    {
        QSqlQuery query = SqlQueryExecutor::instance().executeSQL(m_connection, strSQL);
        while(query.next())
        {
            RowData data;
            //data.record = query.record();
            for(int i = 0; i < m_displayField.count(); i++)
            {
                data.values.append(query.value(i));
            }
            m_currentPageData.append(data);
        }
    }
    catch (const DatabaseException& e)
    {
        LOG_ERROR("SQL", QString::fromWCharArray(L"获取属性信息失败。modelID:%1, groupID:%2").arg(m_modelAttributeGroup.modelID, m_modelAttributeGroup.groupID));
    }

    endResetModel();
}

void AttributeTableModel::setPageSize(int size)
{
    if(m_paginationInfo.entriesPerPage != size && size > 0)
    {
        m_paginationInfo.entriesPerPage = size;
        refresh();
    }
}
int AttributeTableModel::pageSize() const
{
    return m_paginationInfo.entriesPerPage;
}

void AttributeTableModel::setCurrentPage(int page)
{
    if(m_paginationInfo.currentPage != page && page > 0 && page <= totalPages())
    {
        m_paginationInfo.currentPage = page;
        refresh();
    }
}
int AttributeTableModel::currentPage() const
{
    return m_paginationInfo.currentPage;
}

int AttributeTableModel::totalPages() const
{
    return qCeil(static_cast<qreal>(m_paginationInfo.totalEntries) / m_paginationInfo.entriesPerPage);
}

void AttributeTableModel::previousPage()
{
    if(m_paginationInfo.entriesPerPage == 1)
        return;

    setCurrentPage(m_paginationInfo.entriesPerPage--);
}
void AttributeTableModel::nextPage()
{
    if(m_paginationInfo.entriesPerPage == totalPages())
        return;

    setCurrentPage(m_paginationInfo.entriesPerPage++);
}
void AttributeTableModel::firstPage()
{
    if(m_paginationInfo.entriesPerPage == 1)
        return;

    setCurrentPage(1);
}
void AttributeTableModel::lastPage()
{
    if(m_paginationInfo.entriesPerPage == totalPages())
        return;

    setCurrentPage(totalPages());
}

void AttributeTableModel::updateTotalCount()
{
    if (m_tableName.isEmpty())
    {
        LOG_ERROR("SQL", QString::fromWCharArray(L"属性表名称为空，获取属性数量失败"));
        return;
    }

    m_paginationInfo.totalEntries = SqlQueryExecutor::instance().getAttributeCount(m_connection, m_tableName);
}

void AttributeTableModel::setTable(const QString& tableName)
{
    if(m_tableName == tableName)
        return;

    m_tableName = tableName;
    m_modifiedRows.clear();
    refresh();
}

void AttributeTableModel::refresh()
{
    if(!m_modifiedRows.isEmpty())
    {
        emit showMessage(type_question, QString::fromWCharArray(L"提示"),
                         QString::fromWCharArray(L"当前有编辑或修改数据未提交，是否进行提交？"));
        if(g_msgDlgBtn == btn_Yes)
        {

        }
        else
            m_modifiedRows.clear();

    }

    loadPageData();
    updateTotalCount();
    emit syncDataStatus(m_modifiedRows.isEmpty(), m_paginationInfo);
}

void AttributeTableModel::insertRecord(int row)
{
    if(row < 0 || row > rowCount())
        return;

    RowData newRow;
    newRow.state = New;
    newRow.values.resize(m_displayField.count());

    int globalRow = (m_paginationInfo.currentPage - 1) * m_paginationInfo.entriesPerPage + row;
    m_modifiedRows[globalRow] = newRow;

    beginInsertRows(QModelIndex(), row, row);
    m_currentPageData.insert(row, newRow);
    endInsertRows();
}

void AttributeTableModel::removeRecord(int row)
{
    if(row < 0 || row > rowCount())
        return;

    emit showMessage(type_question, QString::fromWCharArray(L"提示"),
                     QString::fromWCharArray(L"确认要删除该记录吗？"));
    if(g_msgDlgBtn == btn_No)
        return;


    int globalRow = (m_paginationInfo.currentPage - 1) * m_paginationInfo.entriesPerPage + row;
    /*if(m_currentPageData.at(row).state == New) //新添加未提交的记录,直接删除
    {
        beginRemoveRows(QModelIndex(), row, row);
        m_modifiedRows.remove(globalRow);
        m_currentPageData.removeAt(row);
        endRemoveRows();
    }
    else*/ //整行画红线进行标记
    {
        m_currentPageData[row].state = Deleted;
        m_modifiedRows[globalRow] = m_currentPageData[row];
        m_modifiedRows[globalRow].state = Deleted;

        QModelIndex topLeft = createIndex(row, 0);
        QModelIndex bottomRight = createIndex(row, columnCount() - 1);
        emit dataChanged(topLeft, bottomRight, {Qt::DisplayRole});
    }

}

void AttributeTableModel::triggerSyncSignal()
{
    emit syncDataStatus(m_modifiedRows.isEmpty(), m_paginationInfo);
}