const linux = std.os.linux;
const std = @import("std");

const STDIN_FILENO = std.os.STDIN_FILENO;
const RawMode = @This();
const tcflag_t = linux.tcflag_t;
const tcgetattr = std.os.tcgetattr;
const tcsetattr = std.os.tcsetattr;
const termios = std.os.termios;

orig: termios,

pub fn init() !RawMode {
    const orig = try tcgetattr(STDIN_FILENO);
    const self = RawMode{ .orig = orig };
    errdefer self.deinit();

    var raw = orig;

    raw.iflag &= ~@as(tcflag_t, linux.BRKINT | linux.ICRNL | linux.INPCK | linux.ISTRIP | linux.IXON);
    raw.lflag &= ~@as(tcflag_t, linux.ECHO | linux.ICANON | linux.IEXTEN | linux.ISIG);
    raw.oflag &= ~@as(tcflag_t, linux.OPOST);

    raw.cflag |= linux.CS8;

    raw.cc[linux.V.MIN] = 0;
    raw.cc[linux.V.TIME] = 1;

    try tcsetattr(STDIN_FILENO, .FLUSH, raw);

    return self;
}

pub fn deinit(self: RawMode) void {
    tcsetattr(STDIN_FILENO, .FLUSH, self.orig) catch |err| {
        std.log.err("Failed to reset termios: {}", .{err});
    };
}