#pragma once

#include "ISource.h"
#include "fs/Api.h"
#include "tl/span.h"

namespace fs
{

//Design rationale:
// Sources are throw-away objects representing a data source or sink (the Sink).
// They are not supposed to be reused. 
// There is only one owner of the source, enforced by the tl::unique_ref wrapper. Due to this, sources are NOT thread safe.
// There is no open/close for sources as the open is done in the constructor and close in the destructor. This is to reinforce the idea of throw-away objects.
// If you need a persistent source to be able to reload your data, hold a 
//		path to the source instead of the source. This is to allow the underlying file system to change (due to DLC for example). When you need the source again, request a new one from the file system.

class FS_API IMapSource : public ISource
{
public:
	IMapSource() = default;
	~IMapSource() override = default;

	IMapSource(IMapSource&&) = default;
	IMapSource& operator=(IMapSource&&) = default;

	//this maps the source from the current pointer and size bytes. the pointer is advanced with size bytes
	virtual tl::span<const uint8_t> map(size_t size) = 0;
};


}