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

AttributeTableModel::AttributeTableModel(QObject* parent, const QString& connection, const QString& modelID, const QString& groupID, const QString& tableName)
    : QAbstractTableModel(parent)
    , m_connection(connection)
    , m_modelID(modelID)
    , m_groupID(groupID)
    , m_tableName(tableName)
{
    m_pageSize = 100;
    m_currentPage = 1;
    m_totalCount = 0;

    m_visibleColumns << "attribute" << "attribute_name" << "data_type_id" << "length_precision" << "default_value";
}

AttributeTableModel::~AttributeTableModel()
{}

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_currentPage - 1) * m_pageSize + row;

    if(index.column() == 0) //第一列显示行号
    {
        switch (role)
        {
        case Qt::DisplayRole:
        {
            QString prefix;
            if(m_modifiedRows.contains(globalRow))
            {
                switch(m_modifiedRows[globalRow].state)
                {
                case Modified:
                    prefix = "*";
                    break;
                case New:
                    prefix = "+";
                    break;
                case Deleted:
                    prefix = "-";
                    break;
                default:
                    break;
                }
            }
            return prefix + QString::number(globalRow + 1);
        }
        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);
        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;

    int row = index.row();
    int globalRow = (m_currentPage - 1) * m_pageSize + 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.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
        {
            return m_visibleColumns.value(section);
        }
    }
    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_visibleColumns.isEmpty() ? 0 : m_visibleColumns.count() + 1;
}

Qt::ItemFlags AttributeTableModel::flags(const QModelIndex &index) const
{
    Qt::ItemFlags flags = QAbstractTableModel::flags(index);
    if (index.column() != 0) //行号列不能编辑
        flags = flags | Qt::ItemIsEditable;
    return flags;
}

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

    beginResetModel();

    QString strSQL = QString("SELECT %1 FROM %2 LIMIT %3 OFFSET %4")
                         .arg(m_visibleColumns.join(", "))
                         .arg(m_tableName)
                         .arg(m_pageSize)
                         .arg((m_currentPage - 1) * m_pageSize);
    try
    {
        QSqlQuery query = SqlQueryExecutor::instance().executeSQL(m_connection, strSQL);
        while(query.next())
        {
            RowData data;
            data.record = query.record();
            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_modelID, m_groupID));
    }

    endResetModel();
}

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