//
//  NIB.cpp
//  Clock Signal
//
//  Created by Thomas Harte on 21/04/2018.
//  Copyright © 2018 Thomas Harte. All rights reserved.
//

#include "NIB.hpp"

using namespace Storage::Disk;

namespace {

const std::size_t track_length = 6656;
const std::size_t number_of_tracks = 35;

}

NIB::NIB(const std::string &file_name) :
	file_(file_name) {
	// A NIB should be 35 tracks, each 6656 bytes long.
	if(file_.stats().st_size != track_length*number_of_tracks) {
		throw ErrorNotNIB;
	}

	// TODO: all other validation.
}

int NIB::get_head_position_count() {
	return number_of_tracks * 4;
}

std::shared_ptr<::Storage::Disk::Track> NIB::get_track_at_position(::Storage::Disk::Track::Address address) {
	// NIBs contain data for even-numbered tracks underneath a single head only.
	if(address.head || (address.position&1)) return nullptr;

//	const int file_track = address.position >> 1;
//	file_.seek(static_cast<long>(file_track * track_length), SEEK_SET);
//	std::vector<uint8_t> track_data = file_.read(track_length);

	// TODO: determine which FFs are syncs, and produce track.

	return nullptr;
}