package serialport

import (
	"testing"

	"golang.org/x/sys/unix"
)

func TestConfigureRaw115200OverridesInheritedBaud(t *testing.T) {
	var termios unix.Termios
	termios.Iflag = unix.IGNBRK | unix.ICRNL
	termios.Oflag = unix.OPOST
	termios.Lflag = unix.ICANON | unix.ECHO
	termios.Cflag = unix.B9600 | unix.CS8 | unix.CREAD | unix.CLOCAL | unix.HUPCL
	termios.Ispeed = unix.B9600
	termios.Ospeed = unix.B9600

	configureRaw115200(&termios)

	if got := termios.Cflag & unix.CBAUD; got != unix.B115200 {
		t.Fatalf("effective baud bits=%#o want %#o", got, unix.B115200)
	}
	if got := termios.Cflag & unix.CSIZE; got != unix.CS8 {
		t.Fatalf("character size bits=%#o want %#o", got, unix.CS8)
	}
	for _, flag := range []uint32{unix.CREAD, unix.CLOCAL} {
		if termios.Cflag&flag == 0 {
			t.Fatalf("flag %#o lost", flag)
		}
	}
	for _, flag := range []uint32{unix.PARENB, unix.CSTOPB, unix.CRTSCTS} {
		if termios.Cflag&flag != 0 {
			t.Fatalf("flag %#o must be cleared", flag)
		}
	}
	if termios.Iflag != 0 || termios.Oflag != 0 || termios.Lflag != 0 {
		t.Fatal("raw mode must clear Iflag, Oflag and Lflag")
	}
	if termios.Ispeed != unix.B115200 || termios.Ospeed != unix.B115200 {
		t.Fatalf("speed fields=%d/%d want 115200/115200", termios.Ispeed, termios.Ospeed)
	}
	if termios.Cc[unix.VMIN] != 1 || termios.Cc[unix.VTIME] != 0 {
		t.Fatalf("VMIN=%d VTIME=%d want 1/0", termios.Cc[unix.VMIN], termios.Cc[unix.VTIME])
	}
}

func TestVerifyBaudAcceptsOnlyConfiguredLineSpeed(t *testing.T) {
	var inherited unix.Termios
	inherited.Cflag = unix.B9600 | unix.CS8
	if err := verifyBaud(inherited, unix.B115200); err == nil {
		t.Fatal("inherited 9600 line speed must fail verification")
	}

	var configured unix.Termios
	configured.Cflag = unix.B115200 | unix.CS8 | unix.CREAD
	if err := verifyBaud(configured, unix.B115200); err != nil {
		t.Fatalf("115200 line speed must verify: %v", err)
	}
}