#include "catch.hpp"

#include "MemoryBufferFile.hh"

#include "File.hh"

#include "ranges.hh"

#include "xrange.hh"

#include <array>

using namespace openmsx;

TEST_CASE("MemoryBufferFile")

{

	std::array<uint8_t, 10> buffer = {

		1, 2, 3, 4, 5, 6, 7, 8, 9, 10

	};

	std::array<uint8_t, 100> tmp;

	// create memory-backed-file

	File file = memory_buffer_file(buffer);

	CHECK(file.getPos() == 0);

	CHECK(file.isReadOnly());

	CHECK(file.getSize() == 10);

	// seek and read small part

	file.seek(2);

	CHECK(file.getPos() == 2);

	file.read(subspan(tmp, 0, 3));

	CHECK(file.getPos() == 5);

	CHECK(tmp[0] == 3);

	CHECK(tmp[1] == 4);

	CHECK(tmp[2] == 5);

	// seek beyond end of file is ok, but reading there is not

	file.seek(100);

	CHECK(file.getPos() == 100);

	CHECK_THROWS(file.read(subspan(tmp, 0, 2)));

	// try to read more than file size

	file.seek(0);

	CHECK(file.getPos() == 0);

	CHECK_THROWS(file.read(subspan(tmp, 0, 100)));

	CHECK(file.getPos() == 0);

	// read full file

	file.seek(0);

	file.read(std::span{tmp.data(), file.getSize()});

	for (auto i : xrange(10)) {

		CHECK(tmp[i] == (i + 1));

	}

	CHECK(file.getPos() == file.getSize());

	// writing is not supported

	CHECK_THROWS(file.write(std::span{tmp.data(), file.getSize()}));

}