package main

import (
	"errors"
	"reflect"
	"testing"

	"netdome.biz/paul/qmk-rgb/internal/via"
)

type commandReport struct {
	channel    via.Channel
	param      uint8
	value      uint8
	hue        uint8
	saturation uint8
}

type fakeZoneProtocol struct {
	reports  []commandReport
	failAt   int
	channels []via.Channel
}

// DetectChannels reports the board's three channels unless a test asks for a
// different set.
func (f *fakeZoneProtocol) DetectChannels() ([]via.Channel, error) {
	if f.channels == nil {
		return impact80Channels(), nil
	}
	return f.channels, nil
}

func (f *fakeZoneProtocol) SetValue(channel via.Channel, param, value uint8) error {
	if f.failAt >= 0 && f.failAt == len(f.reports) {
		return errors.New("write failed")
	}
	f.reports = append(f.reports, commandReport{
		channel: channel,
		param:   param,
		value:   value,
	})
	return nil
}

func (f *fakeZoneProtocol) SetColor(channel via.Channel, hue, saturation uint8) error {
	if f.failAt >= 0 && f.failAt == len(f.reports) {
		return errors.New("write failed")
	}
	f.reports = append(f.reports, commandReport{
		channel:    channel,
		param:      4,
		hue:        hue,
		saturation: saturation,
	})
	return nil
}

// GetValue reports the last value written to a channel, so a command that reads
// back what it set sees a keyboard that accepted it. A channel that was never
// written to still fails, so a read-back without a preceding set stays visible.
func (f *fakeZoneProtocol) GetValue(channel via.Channel, param uint8) ([]byte, error) {
	for i := len(f.reports) - 1; i >= 0; i-- {
		if f.reports[i].channel == channel && f.reports[i].param == param {
			return []byte{f.reports[i].value}, nil
		}
	}
	return nil, errors.New("unexpected GetValue call")
}

func (f *fakeZoneProtocol) Close() error {
	return nil
}

func TestSelectedChannelOperations(t *testing.T) {
	defaultZones := []via.Channel{via.ChannelRgblight, via.ChannelRgbMatrix, via.ChannelAudio}
	sideZones := []via.Channel{via.ChannelAudio}

	operations := []struct {
		name      string
		zones     []via.Channel
		sideZones []via.Channel
		run       func(zoneProtocol, []via.Channel) error
		want      []commandReport
		wantSide  []commandReport
	}{
		{
			name:      "brightness",
			zones:     defaultZones,
			sideZones: sideZones,
			run: func(protocol zoneProtocol, zones []via.Channel) error {
				return setBrightnessOnChannels(protocol, zones, 160)
			},
			want: []commandReport{
				{channel: 2, param: 1, value: 160},
				{channel: 3, param: 1, value: 160},
				{channel: 4, param: 1, value: 160},
			},
			wantSide: []commandReport{{channel: 4, param: 1, value: 160}},
		},
		{
			name:      "speed",
			zones:     defaultZones,
			sideZones: sideZones,
			run: func(protocol zoneProtocol, zones []via.Channel) error {
				return setSpeedChannels(protocol, zones, 2)
			},
			want: []commandReport{
				{channel: 2, param: 3, value: 2},
				{channel: 3, param: 3, value: 2},
				{channel: 4, param: 3, value: 2},
			},
			wantSide: []commandReport{{channel: 4, param: 3, value: 2}},
		},
		{
			name:      "color",
			zones:     defaultZones,
			sideZones: sideZones,
			run: func(protocol zoneProtocol, zones []via.Channel) error {
				return setColorOnChannels(protocol, zones, 85, 255)
			},
			want: []commandReport{
				{channel: 2, param: 4, hue: 85, saturation: 255},
				{channel: 3, param: 4, hue: 85, saturation: 255},
				{channel: 4, param: 4, hue: 85, saturation: 255},
			},
			wantSide: []commandReport{{channel: 4, param: 4, hue: 85, saturation: 255}},
		},
		{
			name:      "disable",
			zones:     defaultZones,
			sideZones: sideZones,
			run:       disableLightingOnChannels,
			want: []commandReport{
				{channel: 2, param: 2, value: 0},
				{channel: 2, param: 1, value: 0},
				{channel: 3, param: 2, value: 0},
				{channel: 3, param: 1, value: 0},
				{channel: 4, param: 2, value: 0},
				{channel: 4, param: 1, value: 0},
			},
			wantSide: []commandReport{
				{channel: 4, param: 2, value: 0},
				{channel: 4, param: 1, value: 0},
			},
		},
		{
			name:      "enable",
			zones:     defaultZones,
			sideZones: sideZones,
			run: func(protocol zoneProtocol, channels []via.Channel) error {
				return enableLightingOnChannels(protocol, channels, impact80Catalog(t))
			},
			// enable writes the first effect each channel's own list names, which
			// is wave on logo and side and solid_color on the backlight.
			want: []commandReport{
				{channel: 2, param: 2, value: 1},
				{channel: 2, param: 1, value: 160},
				{channel: 3, param: 2, value: 1},
				{channel: 3, param: 1, value: 160},
				{channel: 4, param: 2, value: 1},
				{channel: 4, param: 1, value: 160},
			},
			wantSide: []commandReport{
				{channel: 4, param: 2, value: 1},
				{channel: 4, param: 1, value: 160},
			},
		},
	}

	for _, tc := range operations {
		t.Run(tc.name+"/default", func(t *testing.T) {
			protocol := &fakeZoneProtocol{failAt: -1}
			if err := tc.run(protocol, tc.zones); err != nil {
				t.Fatalf("operation error = %v", err)
			}
			if !reflect.DeepEqual(protocol.reports, tc.want) {
				t.Errorf("reports = %v, want %v", protocol.reports, tc.want)
			}
		})
		t.Run(tc.name+"/side", func(t *testing.T) {
			protocol := &fakeZoneProtocol{failAt: -1}
			if err := tc.run(protocol, tc.sideZones); err != nil {
				t.Fatalf("operation error = %v", err)
			}
			if !reflect.DeepEqual(protocol.reports, tc.wantSide) {
				t.Errorf("reports = %v, want %v", protocol.reports, tc.wantSide)
			}
		})
	}
}

func TestSelectedChannelStopsOnFirstError(t *testing.T) {
	protocol := &fakeZoneProtocol{failAt: 1}
	err := setBrightnessOnChannels(protocol, impact80Channels(), 160)
	if err == nil {
		t.Fatal("setBrightnessOnChannels() expected error, got nil")
	}
	if len(protocol.reports) != 1 {
		t.Errorf("reports = %v, want one report before failure", protocol.reports)
	}
}

// README.md promises the commands that take no arguments reject a stray token.
// keyboard info declared none, so cobra accepted any number of them.
func TestKeyboardInfoRejectsAStrayToken(t *testing.T) {
	if keyboardInfoCmd.Args == nil {
		t.Fatal("keyboard info declares no Args, so a stray token is accepted")
	}
	if err := keyboardInfoCmd.Args(keyboardInfoCmd, []string{"bogus"}); err == nil {
		t.Error("keyboard info accepted a stray token, want it rejected")
	}
	if err := keyboardInfoCmd.Args(keyboardInfoCmd, nil); err != nil {
		t.Errorf("keyboard info rejected no token: %v", err)
	}
}