#pragma once

#include "Peripherals.hpp"

#include <cstdint>
#include <vector>
#include <stack>

namespace chocochip8 {

class Interpreter {
private:
  using reg_t = uint8_t;
  using sreg_t = unsigned;

public:
  constexpr static sreg_t scResetVector = 0x0200;
  constexpr static size_t scMemorySize = 4096;

  enum {
    R_V0, R_V1, R_V2, R_V3, R_V4, R_V5, R_V6, R_V7,
    R_V8, R_V9, R_VA, R_VB, R_VC, R_VD, R_VE, R_VF,
    R_COUNT
  };

  enum {
    SR_PC, SR_I, SR_T1, SR_T2,
    SR_COUNT
  };

  enum class Opcode {
    SET, ADD, SUB, SUB2, AND, OR, XOR, LSH, RSH, RAND, JEQ, JNEQ, UNIMPL
  };

public:
  Interpreter(unsigned ticksPerSecond, Display &display, Buzzer &buzzer, Keypad &keypad);
  void tick();
  void loadProgram(size_t where, char const* data, size_t count);

private:
  void executeArithmetic(Opcode opcode, int iReg, reg_t operand);

private:
  std::vector<uint8_t> mvMemory;
  std::stack<sreg_t> mCallStack;
  Display &mrDisplay;
  Buzzer &mrBuzzer;
  Keypad &mrKeypad;
  const unsigned mcTicksPerSecond;
  sreg_t mvSpecialReg[SR_COUNT];
  reg_t mvReg[R_COUNT];
}; // class Interpreter

}; // namespace chocohip8