package serial

import (
	"errors"
	"testing"
)

func TestNormalizeLineConfigAppliesSafeDefaults(t *testing.T) {
	config, err := NormalizeLineConfig(LineConfig{Device: "/dev/ttyS1"})
	if err != nil {
		t.Fatalf("normalize line config: %v", err)
	}

	if config.BaudRate != 9600 {
		t.Fatalf("baud rate = %d, want 9600", config.BaudRate)
	}
	if config.DataBits != 8 {
		t.Fatalf("data bits = %d, want 8", config.DataBits)
	}
	if config.Parity != "none" {
		t.Fatalf("parity = %q, want none", config.Parity)
	}
	if config.StopBits != 1 {
		t.Fatalf("stop bits = %d, want 1", config.StopBits)
	}
	if config.StopBitsMode != "1" {
		t.Fatalf("stop bits mode = %q, want 1", config.StopBitsMode)
	}
	if config.FlowControl != "none" {
		t.Fatalf("flow control = %q, want none", config.FlowControl)
	}
}

func TestNormalizeLineConfigAcceptsTargetDeviceProfile(t *testing.T) {
	config, err := NormalizeLineConfig(LineConfig{
		Device:      "/dev/serial/by-path/platform-pcie-uart-port1",
		BaudRate:    115200,
		DataBits:    7,
		Parity:      "Even",
		StopBits:    2,
		FlowControl: "RTSCTS",
	})
	if err != nil {
		t.Fatalf("normalize line config: %v", err)
	}

	if config.Parity != "even" {
		t.Fatalf("parity = %q, want even", config.Parity)
	}
	if config.FlowControl != "rtscts" {
		t.Fatalf("flow control = %q, want rtscts", config.FlowControl)
	}
}

func TestNormalizeLineConfigRejectsUnsafeOrUnsupportedValues(t *testing.T) {
	for _, item := range []LineConfig{
		{Device: ""},
		{Device: "COM1"},
		{Device: "/dev/ttyS1", BaudRate: 12345},
		{Device: "/dev/ttyS1", DataBits: 9},
		{Device: "/dev/ttyS1", Parity: "invalid"},
		{Device: "/dev/ttyS1", StopBits: 3},
		{Device: "/dev/ttyS1", FlowControl: "invalid"},
		{Device: "/dev/ttyS1", FlowControl: "rtscts", RTSControl: "on"},
		{Device: "/dev/ttyS1", DataBits: 8, StopBitsMode: "1.5"},
	} {
		if _, err := NormalizeLineConfig(item); !errors.Is(err, ErrInvalidLineConfig) {
			t.Fatalf("NormalizeLineConfig(%#v) error = %v, want ErrInvalidLineConfig", item, err)
		}
	}
}