#pragma once

#if !defined(BAD_APPLE_OS_SERIAL_HPP_INCLUDED)
#define BAD_APPLE_OS_SERIAL_HPP_INCLUDED

#include <cstdint>

#include "./port.hpp"

inline constexpr std::uint16_t PORT_COM1 = 0x3F8;
inline constexpr std::uint16_t PORT_COM2 = 0x2F8;
inline constexpr std::uint16_t PORT_COM3 = 0x3E8;
inline constexpr std::uint16_t PORT_COM4 = 0x2E8;
inline constexpr std::uint16_t PORT_COM5 = 0x5F8;
inline constexpr std::uint16_t PORT_COM6 = 0x4F8;
inline constexpr std::uint16_t PORT_COM7 = 0x5E8;
inline constexpr std::uint16_t PORT_COM8 = 0x4E8;

[[nodiscard]] inline bool initSerialPort(std::uint16_t port) noexcept
{
    writePortByte(port + 1, 0x00);    // Disable all interrupts
    writePortByte(port + 3, 0x80);    // Enable DLAB (set baud rate divisor)
    writePortByte(port + 0, 0x03);    // Set divisor to 3 (lo byte) 38400 baud
    writePortByte(port + 1, 0x00);    //                  (hi byte)
    writePortByte(port + 3, 0x03);    // 8 bits, no parity, one stop bit
    writePortByte(port + 2, 0xC7);    // Enable FIFO, clear them, with 14-byte threshold
    writePortByte(port + 4, 0x0B);    // IRQs enabled, RTS/DSR set
    writePortByte(port + 4, 0x1E);    // Set in loopback mode, test the serial chip
    writePortByte(port + 0, 0xAE);    // Test serial chip (send byte 0xAE and check if serial returns same byte)

    // Check if serial is faulty (i.e: not same byte as sent)
    if(readPortByte(port + 0) != 0xAE) {
        return false;
    }

    // If serial is not faulty set it in normal operation mode
    // (not-loopback with IRQs enabled and OUT#1 and OUT#2 bits enabled)
    writePortByte(port + 4, 0x0F);
    return true;
}

inline void serialWrite(std::uint16_t port, std::uint8_t data) noexcept
{
    while ((readPortByte(port + 5) & 0x20) == 0);
    writePortByte(port, data);
}

inline void serialWriteString(std::uint16_t port, const char* str) noexcept
{
    while (*str)
    {
        serialWrite(port, *str);
        ++str;
    }
}

#endif // !defined(BAD_APPLE_OS_SERIAL_HPP_INCLUDED)