CLK/Machines/Acorn/Electron/Tape.hpp

//
//  Tape.hpp
//  Clock Signal
//
//  Created by Thomas Harte on 03/12/2016.
//  Copyright 2016 Thomas Harte. All rights reserved.
//

#pragma once

#include <cstdint>

#include "../../../ClockReceiver/ClockReceiver.hpp"
#include "../../../Storage/Tape/Tape.hpp"
#include "../../../Storage/Tape/Parsers/Acorn.hpp"
#include "Interrupts.hpp"

namespace Electron {

class Tape:
	public Storage::Tape::TapePlayer,
	public Storage::Tape::Acorn::Shifter::Delegate {
public:
	Tape();

	void run_for(const Cycles cycles);
	using Storage::Tape::TapePlayer::run_for;

	uint8_t get_data_register();
	void set_data_register(uint8_t value);
	void set_counter(uint8_t value);

	inline uint8_t get_interrupt_status() { return interrupt_status_; }
	void clear_interrupts(uint8_t interrupts);

	class Delegate {
		public:
			virtual void tape_did_change_interrupt_status(Tape *tape) = 0;
	};
	inline void set_delegate(Delegate *delegate) { delegate_ = delegate; }

	inline void set_is_running(bool is_running) { is_running_ = is_running; }
	inline void set_is_enabled(bool is_enabled) { is_enabled_ = is_enabled; }
	void set_is_in_input_mode(bool is_in_input_mode);

	void acorn_shifter_output_bit(int value);

private:
	void process_input_pulse(const Storage::Tape::Tape::Pulse &pulse);
	inline void push_tape_bit(uint16_t bit);
	inline void get_next_tape_pulse();

	struct {
		int minimum_bits_until_full = 0;
	} input_;
	struct {
		unsigned int cycles_into_pulse = 0;
		unsigned int bits_remaining_until_empty = 0;
	} output_;

	bool is_running_ = false;
	bool is_enabled_ = false;
	bool is_in_input_mode_ = false;

	inline void evaluate_interrupts();
	uint16_t data_register_ = 0;

	uint8_t interrupt_status_ = 0;
	uint8_t last_posted_interrupt_status_ = 0;
	Delegate *delegate_ = nullptr;

	::Storage::Tape::Acorn::Shifter shifter_;
};

}