#include <gtest/gtest.h>

#include "Helper.h"

#include "../AccessHelper.h"
#include "../fat32/FS.h"


TEST (TestSeek, seek1) {

	using BlockDev = AccessHelper<TestDevice>;
	using FS = FAT32::FS<BlockDev>;

	size_t size = 32*1024*1024;
	TestDevice dev(size);
	BlockDev bDev(dev);

	FS fs(bDev, 0);
	ASSERT_FALSE(fs.isValid());	// filesystem must not be considered valid, header contains only zeros
	fs.setup(size, true);		// initialize the filesystem
	ASSERT_TRUE(fs.isValid());	// must be considered valid now

	auto testData = [] (const uint32_t pos) {
		return (uint8_t) (pos * 21 + 13);
	};

	// create a file
	FS::File f1 = fs.getOrCreateFile("test.txt");
	static constexpr uint32_t testSize = 16*1024;
	uint8_t d1[testSize];
	for (int i = 0; i < testSize; ++i) {
		d1[i] = testData(i);
	}
	ASSERT_EQ(testSize, f1.write(testSize, d1));

	// re-open the file
	FS::File f2 = fs.getOrCreateFile("test.txt");


	for (int i = 0; i < 1024; ++i) {
		uint8_t tmp = 0;
		f2.read(1, &tmp);
		ASSERT_EQ(testData(i), tmp);
	}

	for (int i = 0; i < 100; ++i) {
		uint32_t pos = rand() % testSize;
		f2.seekTo(pos);
		uint8_t tmp = 0;
		f2.read(1, &tmp);
		uint8_t expected = testData(pos);
		ASSERT_EQ(expected, tmp);
	}

}