package rgb

import (
	"encoding/json"
	"errors"
	"reflect"
	"testing"

	intrgb "github.com/wobkey/rgb/internal/rgb"
	"github.com/wobkey/rgb/internal/via"
)

type infoKey struct {
	channel via.LEDType
	param   uint8
}

type fakeInfoProtocol struct {
	values map[infoKey][]byte
	errors map[infoKey]error
	calls  []infoKey
}

func (f *fakeInfoProtocol) GetValue(channel via.LEDType, param uint8) ([]byte, error) {
	key := infoKey{channel: channel, param: param}
	f.calls = append(f.calls, key)
	if err := f.errors[key]; err != nil {
		return nil, err
	}
	return append([]byte(nil), f.values[key]...), nil
}

func TestInfoSuccessfulRecord(t *testing.T) {
	protocol := &fakeInfoProtocol{
		values: map[infoKey][]byte{
			{channel: 3, param: 1}: {160},
			{channel: 3, param: 2}: {17},
			{channel: 3, param: 3}: {2},
			{channel: 3, param: 4}: {85, 255},
			{channel: 2, param: 1}: {80},
			{channel: 2, param: 2}: {4},
			{channel: 2, param: 3}: {1},
			{channel: 2, param: 4}: {0, 128},
		},
		errors: make(map[infoKey]error),
	}
	zones := []intrgb.Zone{intrgb.ZoneBacklight, intrgb.ZoneLogo}

	got, err := readInfo(protocol, zones)
	if err != nil {
		t.Fatalf("readInfo() unexpected error: %v", err)
	}
	want := infoOutput{
		Enabled:    true,
		Mode:       "rainbow_moving_chevron",
		Brightness: 160,
		Speed:      2,
		Zones: []zoneInfo{
			{
				Zone:       intrgb.ZoneBacklight,
				Channel:    3,
				Enabled:    true,
				Effect:     "rainbow_moving_chevron",
				EffectID:   17,
				Brightness: 160,
				Speed:      2,
				Color:      infoColor{Hue: 85, Saturation: 255},
			},
			{
				Zone:       intrgb.ZoneLogo,
				Channel:    2,
				Enabled:    true,
				Effect:     "breathing",
				EffectID:   4,
				Brightness: 80,
				Speed:      1,
				Color:      infoColor{Hue: 0, Saturation: 128},
			},
		},
	}
	if !reflect.DeepEqual(got, want) {
		t.Fatalf("readInfo() = %+v, want %+v", got, want)
	}

	data, err := json.Marshal(got)
	if err != nil {
		t.Fatalf("json.Marshal() error = %v", err)
	}
	wantJSON := `{"enabled":true,"mode":"rainbow_moving_chevron","brightness":160,"speed":2,"zones":[{"zone":"backlight","channel":3,"enabled":true,"effect":"rainbow_moving_chevron","effectId":17,"brightness":160,"speed":2,"color":{"hue":85,"saturation":255}},{"zone":"logo","channel":2,"enabled":true,"effect":"breathing","effectId":4,"brightness":80,"speed":1,"color":{"hue":0,"saturation":128}}]}`
	if string(data) != wantJSON {
		t.Errorf("JSON = %s, want %s", data, wantJSON)
	}
}

func TestInfoErrorRecord(t *testing.T) {
	protocol := &fakeInfoProtocol{
		values: map[infoKey][]byte{
			{channel: 2, param: 1}: {120},
			{channel: 2, param: 2}: {4},
			{channel: 2, param: 3}: {3},
			{channel: 2, param: 4}: {10, 20},
			{channel: 3, param: 1}: {90},
			{channel: 3, param: 2}: {5},
			{channel: 3, param: 3}: {4},
			{channel: 3, param: 4}: {30, 40},
		},
		errors: map[infoKey]error{
			{channel: 4, param: 1}: errors.New("side unavailable"),
		},
	}
	zones := []intrgb.Zone{intrgb.ZoneLogo, intrgb.ZoneSide, intrgb.ZoneBacklight}

	got, err := readInfo(protocol, zones)
	if err == nil {
		t.Fatal("readInfo() expected error, got nil")
	}
	want := infoOutput{
		Enabled:    true,
		Mode:       "breathing",
		Brightness: 120,
		Speed:      3,
		Zones: []zoneInfo{
			{
				Zone:       intrgb.ZoneLogo,
				Channel:    2,
				Enabled:    true,
				Effect:     "breathing",
				EffectID:   4,
				Brightness: 120,
				Speed:      3,
				Color:      infoColor{Hue: 10, Saturation: 20},
			},
			{
				Zone:    intrgb.ZoneSide,
				Channel: 4,
				Error:   "side unavailable",
			},
			{
				Zone:       intrgb.ZoneBacklight,
				Channel:    3,
				Enabled:    true,
				Effect:     "breathing",
				EffectID:   5,
				Brightness: 90,
				Speed:      4,
				Color:      infoColor{Hue: 30, Saturation: 40},
			},
		},
	}
	if !reflect.DeepEqual(got, want) {
		t.Fatalf("readInfo() = %+v, want %+v", got, want)
	}

	data, err := json.Marshal(got)
	if err != nil {
		t.Fatalf("json.Marshal() error = %v", err)
	}
	var envelope struct {
		Zones []map[string]json.RawMessage `json:"zones"`
	}
	if err := json.Unmarshal(data, &envelope); err != nil {
		t.Fatalf("json.Unmarshal() error = %v", err)
	}
	if len(envelope.Zones) != 3 {
		t.Fatalf("zones = %d, want 3", len(envelope.Zones))
	}
	if _, ok := envelope.Zones[1]["error"]; !ok {
		t.Errorf("error zone JSON = %v, want error key", envelope.Zones[1])
	}
}