/* This file is part of the Springlobby (GPL v2 or later), see COPYING */

#ifndef SRC_GUI_BASEDATAVIEWMODEL_H_
#define SRC_GUI_BASEDATAVIEWMODEL_H_

#include <wx/dataview.h>
#include <set>

#include <climits>

#include "log.h"

#define DEFAULT_COLUMN UINT_MAX


template <class DataType>
class BaseDataViewModel : public wxDataViewModel
{
public:
	explicit BaseDataViewModel(size_t columns)
	    : m_columns(columns)
	{
	}
	virtual ~BaseDataViewModel();

public:
	//Overriden methods from wxDataViewModel
	virtual void GetValue(wxVariant&, const wxDataViewItem&, unsigned int) const override = 0;
	virtual wxDataViewItem GetParent(const wxDataViewItem&) const override;
	virtual unsigned int GetChildren(const wxDataViewItem&, wxDataViewItemArray&) const override;
	virtual int Compare(const wxDataViewItem&, const wxDataViewItem&, unsigned int, bool) const override;
	virtual bool IsListModel() const override;
	virtual bool GetAttr(const wxDataViewItem&, unsigned int, wxDataViewItemAttr&) const override;
	size_t GetItemsCount() const
	{
		return m_ModelData.size();
	}

public:
	//Custom methods
	bool AddItem(const DataType&);
	bool RemoveItem(const DataType&);
	bool ContainsItem(const DataType&) const;
	void Clear();
	bool UpdateItem(const DataType&);
	const std::set<const DataType*>& GetItemsContainer() const;

public:
	//These methods from wxDataViewModel does not require to be overriden in derived classes
	bool IsContainer(const wxDataViewItem&) const override;
	bool SetValue(const wxVariant&, const wxDataViewItem&, unsigned int) override;
	//Must be reimplemented!
	wxString GetColumnType(unsigned int) const override = 0;
	virtual unsigned int GetColumnCount() const override
	{
		return m_columns;
	}

protected:
	const wxString COL_TYPE_TEXT = _T("string");
	const wxString COL_TYPE_ICONTEXT = _T("icontext");
	const wxString COL_TYPE_BITMAP = _T("bitmap");

private:
	size_t m_columns;
	std::set<const DataType*> m_ModelData;
};

/////////////////////////////////////////////////////////////////////////////////////////
///////////////////////////// Implementation ////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////////////////////

template <class DataType>
BaseDataViewModel<DataType>::~BaseDataViewModel()
{
	// TODO Auto-generated destructor stub
}

template <class DataType>
int BaseDataViewModel<DataType>::Compare(const wxDataViewItem& item1, const wxDataViewItem& item2,
					 unsigned int column, bool ascending) const
{
	return wxDataViewModel::Compare(item1, item2, column, ascending);
}

template <class DataType>
wxDataViewItem BaseDataViewModel<DataType>::GetParent(const wxDataViewItem& /*item*/) const
{
	return wxDataViewItem(); //Root is only one possible parent
}

template <class DataType>
unsigned int BaseDataViewModel<DataType>::GetChildren(const wxDataViewItem& item,
						      wxDataViewItemArray& children) const
{
	if (item.IsOk()) { //Return items only for root!
		return 0;
	} else {

		for (auto dataItem : m_ModelData) {
			children.Add(wxDataViewItem(const_cast<DataType*>(dataItem)));
		}
		return children.GetCount();
	}
}

template <class DataType>
bool BaseDataViewModel<DataType>::AddItem(const DataType& data)
{
	if (ContainsItem(data)) {
		wxASSERT(false);
		wxLogWarning(_T("BaseDataViewModel<DataType>::AddItem: Item already presents in model!"));
		return false;
	}

	m_ModelData.insert(&data);

	//Inform model about new item
	const wxDataViewItem item = wxDataViewItem(const_cast<DataType*>(&data));
	ItemAdded(GetParent(item), item);
	return true;
}

template <class DataType>
bool BaseDataViewModel<DataType>::RemoveItem(const DataType& data)
{
	if (!ContainsItem(data)) {
		wxASSERT(false);
		wxLogWarning(_T("BaseDataViewModel<DataType>::RemoveItem: No item presents in model!"));
		return false;
	}

	//Inform model about deleted item
	const wxDataViewItem item = wxDataViewItem(const_cast<DataType*>(&data));
	ItemDeleted(GetParent(item), item);
	m_ModelData.erase(&data);
	return true;
}

template <class DataType>
bool BaseDataViewModel<DataType>::IsContainer(const wxDataViewItem& item) const
{
	return !item.IsOk(); //Only root can containt items
}

template <class DataType>
bool BaseDataViewModel<DataType>::SetValue(const wxVariant&,
					   const wxDataViewItem&, unsigned int)
{
	assert(false);
	return true; //Dummy method
}

//Needed to inform model that there will be no expanders (make view looks like list)
template <class DataType>
inline bool BaseDataViewModel<DataType>::IsListModel() const
{
	return true;
}

template <class DataType>
inline bool BaseDataViewModel<DataType>::ContainsItem(const DataType& checkedItem) const
{
	assert(&checkedItem != nullptr);

	const DataType* checkItemPointer = &checkedItem;
	return m_ModelData.find(checkItemPointer) != m_ModelData.end();
}

template <class DataType>
inline void BaseDataViewModel<DataType>::Clear()
{
	if (m_ModelData.empty()) {
		return;
	}

	m_ModelData.clear();

	Cleared();
}

template <class DataType>
inline bool BaseDataViewModel<DataType>::UpdateItem(const DataType& item)
{
	if (ContainsItem(item)) {
		//FIXME: Maybe update item in m_ModelData. At this moment it stores pointer and does not need to be updated
		ItemChanged(wxDataViewItem(const_cast<DataType*>(&item)));
		return true;
	} else {
		wxASSERT(false);
		wxLogWarning(_T("BaseDataViewModel<DataType>::RemoveItem: No item presents in model!"));
		return false;
	}
}

template <class DataType>
inline bool BaseDataViewModel<DataType>::GetAttr(const wxDataViewItem&,
						 unsigned int, wxDataViewItemAttr&) const
{
	return false;
}

template <class DataType>
inline const std::set<const DataType*>& BaseDataViewModel<DataType>::GetItemsContainer() const
{
	return m_ModelData;
}

template <class DataType>
wxString BaseDataViewModel<DataType>::GetColumnType(unsigned int) const
{
	assert(false);
	return wxEmptyString; //Does nothing
}

#endif /* SRC_GUI_BASEDATAVIEWMODEL_H_ */
