package main

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

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

type infoKey struct {
	channel via.Channel
	param   uint8
}

// DetectChannels lets the info command's target seam reuse this fake.
func (f *fakeInfoProtocol) DetectChannels() ([]via.Channel, error) {
	return impact80Channels(), nil
}

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

func (f *fakeInfoProtocol) GetValue(channel via.Channel, 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 (f *fakeInfoProtocol) SetValue(via.Channel, uint8, uint8) error {
	return errors.New("unexpected SetValue call")
}

func (f *fakeInfoProtocol) SetColor(via.Channel, uint8, uint8) error {
	return errors.New("unexpected SetColor call")
}

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

func TestInfoSuccessfulRecord(t *testing.T) {
	t.Cleanup(vendoredDefinitions(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 := []via.Channel{via.ChannelRgbMatrix, via.ChannelRgblight}

	got, err := readInfo(protocol, zones, impact80Display(), impact80Catalog(t))
	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:       "backlight",
				Channel:    3,
				Enabled:    true,
				Effect:     "rainbow_moving_chevron",
				EffectID:   17,
				Brightness: 160,
				Speed:      2,
				Color:      infoColor{Hue: 85, Saturation: 255},
			},
			{
				Zone:       "logo",
				Channel:    2,
				Enabled:    true,
				Effect:     "breathe",
				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":"breathe","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) {
	t.Cleanup(vendoredDefinitions(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 := []via.Channel{via.ChannelRgblight, via.ChannelAudio, via.ChannelRgbMatrix}

	got, err := readInfo(protocol, zones, impact80Display(), impact80Catalog(t))
	if err == nil {
		t.Fatal("readInfo() expected error, got nil")
	}
	want := infoOutput{
		Enabled:    true,
		Mode:       "breathe",
		Brightness: 120,
		Speed:      3,
		Zones: []zoneInfo{
			{
				Zone:       "logo",
				Channel:    2,
				Enabled:    true,
				Effect:     "breathe",
				EffectID:   4,
				Brightness: 120,
				Speed:      3,
				Color:      infoColor{Hue: 10, Saturation: 20},
			},
			{
				Zone:    "side",
				Channel: 4,
				Error:   "side unavailable",
			},
			{
				// The vendor spells this channel's breathing effect differently
				// from the other two channels': "breathing" here and "breathe"
				// there. Both are the vendor's own, and the tool reports each
				// channel as its definition writes it.
				Zone:       "backlight",
				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])
	}
}

func TestInfoCommandPrintsJSONBeforeReturningError(t *testing.T) {
	withJSON(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"),
		},
	}
	t.Cleanup(stubOpenTarget(t, protocol, impact80Display(), impact80Channels(), 0x36B0, 0x309F))

	var stdout bytes.Buffer
	var stderr bytes.Buffer
	cmd := NewInfoCmd()
	cmd.SetOut(&stdout)
	cmd.SetErr(&stderr)
	cmd.SilenceErrors = true
	cmd.SilenceUsage = true
	cmd.SetArgs(nil)
	err := cmd.Execute()
	if err == nil {
		t.Fatal("Execute() expected query error, got nil")
	}
	if !strings.Contains(stdout.String(), `"zones"`) || !strings.Contains(stdout.String(), `"error"`) {
		t.Errorf("stdout = %q, want JSON containing zones and error", stdout.String())
	}
	if stderr.Len() != 0 {
		t.Errorf("stderr = %q, want no Cobra usage/error noise", stderr.String())
	}
}