//
// Created by rick on 23-03-20.
//
#include "keyboard.h"

#include <kprint.h>
#include <drivers/ports.h>
#include <cpu/isr.h>
#include <libc/libc.h>

char scancodes_ascii[] = {
        0, 0,
        '1', '2', '3', '4', '5', '6', '7', '8', '9', '0', '-', '=', 0,
        0, 'q', 'w', 'e', 'r', 't', 'y', 'u', 'i', 'o', 'p', '[', ']', 0,
        0, 'a', 's', 'd', 'f', 'g', 'h', 'j', 'k', 'l', ';', '\'', '`',
        0, '\\', 'z', 'x', 'c', 'v', 'b', 'n', 'm', ',', '.', '/', 0,
        '*',
        0, ' ',
        0,
        0, 0, 0, 0, 0, 0, 0, 0, 0, 0, // F1-F10
        0, 0,
        '7', '8', '9', '-',
        '4', '5', '6', '+',
        '1', '2', '3',
        '0', 0,
        0, // sysrq
        0, 0, // weird
        0, 0, // F11 F12
        // weid
};

char *MSG_KEY = "Clicked on key 'x'\n";

void print_scancode(unsigned char scancode);

static void keyboard_callback(registers_t regs) {
    unsigned char status = port_byte_in(PORT_PS2_STATUS);
    // check if data available
    if ((status & 0b00000001) == 0) {
        return;
    }
    unsigned char scancode = port_byte_in(PORT_PS2_DATA);
    print_scancode(scancode);
}

void init_keyboard() {
    register_interrupt_handler(IRQ1, keyboard_callback);
}

void print_scancode(unsigned char scancode) {
    char msg[256];
    char release = 0;
    if (scancode > 0x80) {
        // release
        release = 1;
        scancode -= 0x80;
    }
    char code = scancodes_ascii[scancode];
    if (code == 0) {
        // special
    } else {
        if (release && code > 0x60 && code < 0x7B) {
            code -= 0x20; // to lowercase
        }

        strcpy(msg, MSG_KEY);
        msg[strlen(msg) - 3] = code;
        kprint(msg);
    }
}