const x86 = @import("arch/x86/lib/index.zig");
const console = @import("console.zig");

const PS2_DATA = 0x60;
const PS2_STATUS = 0x64;
const KEYMAP_MAX = 59;
const KEYMAP_US = [_][2]u8{
    "\x00\x00",
    "\x00\x00", //escape
    "1!",
    "2@",
    "3#",
    "4$",
    "5%",
    "6^",
    "7&",
    "8*",
    "9(",
    "0)",
    "-_",
    "=+",
    "\x00\x00", //backspace
    "\x00\x00", //tab
    "qQ",
    "wW",
    "eE",
    "rR",
    "tT",
    "yY",
    "uU",
    "iI",
    "oO",
    "pP",
    "[{",
    "]}",
    "\n\n",
    "\x00\x00", //left_control
    "aA",
    "sS",
    "dD",
    "fF",
    "gG",
    "hH",
    "jJ",
    "kK",
    "lL",
    ";:",
    "'\"",
    "`~",
    "\x00\x00", //left shift
    "\\|",
    "zZ",
    "xX",
    "cC",
    "vV",
    "bB",
    "nN",
    "mM",
    ",<",
    ".>",
    "/?",
    "\x00\x00", //right shift
    "**",
    "\x00\x00", //left alt
    "  ",
    "\x00\x00", //capslock
};

fn ps2_scancode() u8 {
    var scancode: u8 = 0;
    while (true) {
        if (x86.inb(PS2_DATA) != scancode) {
            scancode = x86.inb(PS2_DATA);
            if (scancode > 0)
                return scancode;
        }
    }
}

fn key_isrelease(scancode: u8) bool {
    return (scancode & 1 << 7 != 0);
}

pub fn keyboard_handler() void {
    const scancode = ps2_scancode();
    const isrelease = key_isrelease(scancode);
    if (isrelease) {
        return;
    }
    const shift = false;
    console.keypress(KEYMAP_US[scancode][if (shift) 1 else 0]);
}