package main

import (
	"reflect"
	"strings"
	"testing"

	"github.com/spf13/cobra"
	intdevice "netdome.biz/paul/qmk-rgb/internal/device"
	"netdome.biz/paul/qmk-rgb/internal/via"
)

func TestLightingEnabledRequiresActiveEffectAndBrightness(t *testing.T) {
	cases := []struct {
		name       string
		mode       uint8
		brightness uint8
		want       bool
	}{
		{"active", 1, 160, true},
		{"zero brightness", 1, 0, false},
		{"disabled effect", 0, 160, false},
		{"both zero", 0, 0, false},
	}

	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			if got := lightingEnabled(tc.mode, tc.brightness); got != tc.want {
				t.Errorf("lightingEnabled(%d, %d) = %t, want %t", tc.mode, tc.brightness, got, tc.want)
			}
		})
	}
}

// stubOneImpact80 puts one keyboard in front of the root command's validation,
// which now resolves the target before a subcommand runs.
func stubOneImpact80(t *testing.T) {
	t.Helper()

	stubDiscovery(t, []intdevice.Device{{Index: 1, Path: "hid-device-0", VendorID: 0x36B0, ProductID: 0x309F}})

}

func TestDeviceFlagIsInheritedByCommands(t *testing.T) {
	stubOneImpact80(t)
	ran := false

	cmd := newRootCommand()
	cmd.AddCommand(&cobra.Command{
		Use: "probe",
		Run: func(*cobra.Command, []string) { ran = true },
	})
	cmd.SetArgs([]string{"--device", "1", "probe"})

	if err := cmd.Execute(); err != nil {
		t.Fatalf("Execute() error = %v", err)
	}
	if !ran {
		t.Fatal("child command did not run")
	}
	if targetDevice != "1" {
		t.Errorf("targetDevice = %q, want %q", targetDevice, "1")
	}
}

func TestResolveChannelsDefaultsToEveryDetectedChannel(t *testing.T) {
	proto := &verifyingProtocol{}

	got, err := resolveChannels(proto, targetDeviceData{})
	if err != nil {
		t.Fatalf("resolveChannels() unexpected error: %v", err)
	}
	want := []via.Channel{via.ChannelRgblight, via.ChannelRgbMatrix, via.ChannelAudio}
	if !reflect.DeepEqual(got, want) {
		t.Errorf("resolveChannels() = %v, want %v", got, want)
	}
}

func TestResolveChannelsRejectsAChannelTheKeyboardDoesNotHave(t *testing.T) {
	proto := &verifyingProtocol{channels: []via.Channel{via.ChannelRgblight}}
	target := targetDeviceData{Requested: []via.Channel{via.ChannelAudio}}

	if _, err := resolveChannels(proto, target); err == nil {
		t.Fatal("resolveChannels() expected an error, want the missing channel reported")
	}
}

func TestResolveChannelsRejectsAShadowedDisplayName(t *testing.T) {
	proto := &verifyingProtocol{channels: []via.Channel{via.ChannelBacklight, via.ChannelRgbMatrix}}
	target := targetDeviceData{Display: map[uint16]string{3: "backlight"}}

	if _, err := resolveChannels(proto, target); err == nil {
		t.Fatal("resolveChannels() expected an error, want the shadowed name reported")
	}
}

func TestResolveChannelsReportsWhenNoChannelIsPresent(t *testing.T) {
	proto := &verifyingProtocol{channels: []via.Channel{}}

	if _, err := resolveChannels(proto, targetDeviceData{}); err == nil {
		t.Fatal("resolveChannels() expected an error when the keyboard has no channels")
	}
}

func TestZoneFlagIsInheritedByCommands(t *testing.T) {
	stubOneImpact80(t)
	ran := false
	cmd := newRootCommand()
	cmd.AddCommand(&cobra.Command{
		Use: "probe",
		Run: func(*cobra.Command, []string) { ran = true },
	})
	cmd.SetArgs([]string{"--zone", "backlight", "probe"})

	if err := cmd.Execute(); err != nil {
		t.Fatalf("Execute() error = %v", err)
	}
	if !ran {
		t.Fatal("child command did not run")
	}
	if targetZone != "backlight" {
		t.Errorf("targetZone = %q, want %q", targetZone, "backlight")
	}
}

// Precedence, documented because two errors can apply at once: a board that
// cannot be selected is reported first, since a zone name is resolved against
// the board's own names.
func TestNoKeyboardIsReportedBeforeAnUnknownZone(t *testing.T) {
	stubDiscovery(t, []intdevice.Device{})
	originalZone := targetZone
	t.Cleanup(func() { targetZone = originalZone })
	targetZone = "matx"

	_, _, _, err := openTarget()
	if err == nil {
		t.Fatal("openTarget() expected an error, got nil")
	}
	if !strings.Contains(err.Error(), "no QMK keyboard found") {
		t.Errorf("openTarget() error = %v, want the missing keyboard reported", err)
	}
}