#include "TablesTableModel.h"
#include "catalog/PgDatabaseCatalog.h"
#include "catalog/PgClass.h"
#include "catalog/PgClassContainer.h"
#include "catalog/PgNamespace.h"
#include "catalog/PgNamespaceContainer.h"
#include "Pgsql_declare.h"
#include "CustomDataRole.h"
#include <QBrush>

TablesTableModel::TablesTableModel(QObject *parent)
	: QAbstractTableModel(parent)
{}

void TablesTableModel::setNamespaceFilter(NamespaceFilter nsf)
{
	m_namespaceFilter = nsf;
	reloadData();
}

void TablesTableModel::setCatalog(std::shared_ptr<const PgDatabaseCatalog> cat)
{
	m_catalog = cat;
	reloadData();

}

void TablesTableModel::reloadData()
{
	if (!m_catalog)
		return;

	beginResetModel();

	// Later afscheiden naar filter functie
	auto classes = m_catalog->classes();

	// How many?

	m_tables.clear();
	for (const auto &e : *classes) {
		bool add = false;
		if (e.kind == RelKind::Table || e.kind == RelKind::View
				|| e.kind == RelKind::MaterializedView  || e.kind == RelKind::ForeignTable) {
			switch (m_namespaceFilter) {
			case TablesTableModel::User:
				add = !e.ns().isSystemCatalog();
				break;
			case TablesTableModel::PgCatalog:
				add = e.ns().objectName() == "pg_catalog";
				break;
			case TablesTableModel::InformationSchema:
				add = e.ns().objectName() == "information_schema";
				break;
			}
		}
		if (add)
			m_tables.push_back(e);
	}

	doSort(1);
	endResetModel();
}

void TablesTableModel::setSortOrder(int so)
{
	beginResetModel();
	doSort(so);
	endResetModel();
}

namespace {

	inline bool compareByName(PgClass l, PgClass r)
	{
		return l.objectName() < r.objectName()
				|| (l.objectName() == r.objectName() && l.nsName() < r.nsName());
	}

	inline bool compareBySchema(PgClass l, PgClass r)
	{
		return l.nsName() < r.nsName()
							|| (l.nsName() == r.nsName() && l.objectName() < r.objectName());
	}

}

void TablesTableModel::sort(int column, Qt::SortOrder order)
{
	if (column == NameCol) {
		if (order == Qt::AscendingOrder)
			std::sort(m_tables.begin(), m_tables.end(), compareByName);
		else
			std::sort(m_tables.begin(), m_tables.end(), [] (auto l, auto r) { return !compareByName(l, r); });
	}
	else if (column == NamespaceCol) {
		if (order == Qt::AscendingOrder)
			std::sort(m_tables.begin(), m_tables.end(), compareBySchema);
		else
			std::sort(m_tables.begin(), m_tables.end(), [] (auto l, auto r) { return !compareBySchema(l, r); });
	}

	emit layoutChanged();
}

void TablesTableModel::doSort(int )
{
//	if (so == 1)
//		std::sort(m_tables.begin(), m_tables.end(),
//				  [] (auto l, auto r) -> bool { return l.relnamespace_name < r.relnamespace_name
//						|| (l.relnamespace_name == r.relnamespace_name && l.name < r.name); });
//	else
//		std::sort(m_tables.begin(), m_tables.end(),
//				  [] (auto l, auto r) -> bool { return l.name < r.name; });
}


QVariant TablesTableModel::headerData(int section, Qt::Orientation orientation, int role) const
{
	if (orientation == Qt::Horizontal) {
		if (role == Qt::DisplayRole) {
			switch (section) {
			case NameCol: return tr("Name");
			case NamespaceCol: return tr("Schema");
			case KindCol: return tr("Kind");
			case OwnerCol: return tr("Owner");
			case TablespaceCol: return tr("Tablespace");
			case OptionsCol: return tr("Options");
			case AclCol: return tr("ACL");
			}
		}
	}
	return QVariant();
}

// Basic functionality:
int TablesTableModel::rowCount(const QModelIndex &) const
{
	return m_tables.size();
}

int TablesTableModel::columnCount(const QModelIndex &) const
{
	return colCount;
}

Oid TablesTableModel::getType(int column) const
{
	Oid oid;
	switch (column) {
	case TablespaceCol:
	case OwnerCol:
	case NameCol:
	case NamespaceCol:
	case KindCol:
	case OptionsCol:
	case AclCol:
	default:
		oid = Pgsql::varchar_oid;
	}
	return oid;
}

QVariant TablesTableModel::getData(const QModelIndex &index) const
{
	const auto &t = m_tables[index.row()];
	switch (index.column()) {
	case NameCol:       return t.objectName();
	case NamespaceCol:  return t.nsName();
	case KindCol:       return t.typeName();
	case OwnerCol:      return t.ownerName();
	case TablespaceCol: return getTablespaceDisplayString(*m_catalog, t.tablespace);
	case OptionsCol:	break;
	case AclCol:        return t.aclString();
	}

	return QVariant();
}

PgClass TablesTableModel::getTable(int row) const
{
	return m_tables[row];
}

Oid TablesTableModel::getTableOid(int row) const
{
	return m_tables[row].oid();
}

//QString TablesTableModel::formatTableName(const PgClass &cls) const
//{
//	const char * format = "%2 (%1)";
//	QString ns_name = getNamespaceDisplayString(*m_catalog, cls.relnamespace);
//	return QString(format).arg(ns_name).arg(cls.objectName());
//}

QVariant TablesTableModel::data(const QModelIndex &index, int role) const
{
	if (role == Qt::DisplayRole)
		return getData(index);
	else if (role == CustomDataTypeRole)
		return getType(index.column());
	return QVariant();
}