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#ifndef __fixedarray2d_H__
#define __fixedarray2d_H__

#include "util/fixedarray.h"

namespace Util
{
	/**
		简单的固定大小的2维数组的实现。可退化到1维数组使用
		1、表示一个固定大小的二维数组。
		2、列优先存储。
		(0,0)(1,0)(2,0)
	**/
	template<typename TYPE>
	class FixedArray2D
	{
	public:
		/// define element iterator
		typedef TYPE* Iterator;

		FixedArray2D();

		FixedArray2D(SizeT rowSize, SizeT colSize, const TYPE& initialValue);

		/// all elems count 
		SizeT Size() const;

		/// max row size
		SizeT RowSize() const;
		
		/// max column size
		SizeT ColSize() const;

		/// reset  size 
		void Resize(SizeT rowSize, SizeT colSize);

		/// reset  size  with initialValue
		void Resize(SizeT rowSize, SizeT colSize, const TYPE& initialValue);

		/// clear all elems
		void Clear();

		/// for get elem
		const TYPE& At(IndexT row, IndexT col) const;

		/// for get and set elem
		TYPE& At(IndexT row, IndexT col);

		/// get iterator to first element
		Iterator Begin() const;

		/// get iterator past last element
		Iterator End() const;

		/// (row,col) to 1D Index
		IndexT Index(IndexT row, IndexT col) const;

	protected:
		 Util::FixedArray<TYPE> _array;
		 SizeT _rowSize;	//	行数
		 SizeT _colSize;	//  列数
	};

	//------------------------------------------------------------------------------
	template<typename TYPE>
	FixedArray2D<TYPE>::FixedArray2D() :
	_rowSize(0),
	_colSize(0),
	_array(0)
	{
		// empty
	}
	//------------------------------------------------------------------------
	template<typename TYPE>
	FixedArray2D<TYPE>::FixedArray2D(SizeT rowSize, SizeT colSize, const TYPE& initialValue) :
	_rowSize(rowSize),
	_colSize(colSize),
	_array(rowSize*colSize,initialValue)
	{
#if NEBULA3_BOUNDSCHECKS
		n_assert(rowSize > 0 && colSize >0 );
#endif
	}
	//------------------------------------------------------------------------
	template<typename TYPE>
	SizeT
	FixedArray2D<TYPE>::Size() const
	{
		return _array.Size();
	}
	//------------------------------------------------------------------------
	template<typename TYPE>
	SizeT
	FixedArray2D<TYPE>::RowSize() const
	{
		return _rowSize;
	}
	//------------------------------------------------------------------------
	template<typename TYPE>
	SizeT
	FixedArray2D<TYPE>::ColSize() const
	{
		return _colSize;
	}
	//------------------------------------------------------------------------
	template<typename TYPE>
	void
	FixedArray2D<TYPE>::Resize(SizeT rowSize, SizeT colSize)
	{
#if NEBULA3_BOUNDSCHECKS
		n_assert(rowSize > 0 && colSize >0 );
#endif

		_rowSize = rowSize;
		_colSize = colSize;
		_array.Resize(_rowSize*_colSize);
	}
	//------------------------------------------------------------------------
	template<typename TYPE>
	void
	FixedArray2D<TYPE>::Resize(SizeT rowSize, SizeT colSize, const TYPE& initialValue)
	{
#if NEBULA3_BOUNDSCHECKS
		n_assert(rowSize > 0 && colSize >0 );
#endif

		_rowSize = rowSize;
		_colSize = colSize;
		_array.Resize(_rowSize*_colSize);
		FixedArray2D<TYPE>::Iterator itor = Begin();
		FixedArray2D<TYPE>::Iterator end = End();
		for (; itor != end; ++itor )
		{
			(*itor) = initialValue;
		}
	}
	//------------------------------------------------------------------------
	template<typename TYPE>
	void 
	FixedArray2D<TYPE>::Clear()
	{
		_array.Clear();
		_colSize = 0;
		_rowSize = 0;
	}
	//------------------------------------------------------------------------
	template<typename TYPE>
	const TYPE& 
	FixedArray2D<TYPE>::At(IndexT row, IndexT col) const
	{
#if NEBULA3_BOUNDSCHECKS
		n_assert(row >= 0 && row < _rowSize);
		n_assert(col >= 0 && col < _colSize);
#endif

		IndexT index = Index(row,col);
		return _array[index];
	}
	//------------------------------------------------------------------------
	template<typename TYPE>
	TYPE& 
	FixedArray2D<TYPE>::At(IndexT row, IndexT col)
	{
#if NEBULA3_BOUNDSCHECKS
		n_assert(row >= 0 && row < _rowSize);
		n_assert(col >= 0 && col < _colSize);
#endif

		IndexT index = Index(row,col);
		return _array[index];
	}
	//------------------------------------------------------------------------
	template<typename TYPE>
	typename FixedArray2D<TYPE>::Iterator 
	FixedArray2D<TYPE>::Begin() const
	{
		return _array.Begin();
	}
	//------------------------------------------------------------------------
	template<typename TYPE>
	typename FixedArray2D<TYPE>::Iterator 
	FixedArray2D<TYPE>::End() const
	{
		return _array.End();
	}
	//------------------------------------------------------------------------
	template<typename TYPE>
	IndexT 
	FixedArray2D<TYPE>::Index(IndexT row, IndexT col) const
	{
		return row + col * _rowSize;
	}
}






#endif // __fixedarray2d_H__