package spi

import (
	"image"
	"sync"
	"testing"

	"github.com/stretchr/testify/require"

	"gobot.io/x/gobot/v2"
)

// this ensures that the implementation is based on spi.Driver, which implements the gobot.Driver
// and tests all implementations, so no further tests needed here for gobot.Driver interface
var _ gobot.Driver = (*SSD1306Driver)(nil)

func initTestSSDDriver() *SSD1306Driver {
	return NewSSD1306Driver(newGpioTestAdaptor())
}

func TestDriverSSDStart(t *testing.T) {
	d := initTestSSDDriver()
	require.NoError(t, d.Start())
}

func TestDriverSSDHalt(t *testing.T) {
	d := initTestSSDDriver()
	_ = d.Start()
	require.NoError(t, d.Halt())
}

func TestDriverSSDDisplay(t *testing.T) {
	d := initTestSSDDriver()
	_ = d.Start()
	require.NoError(t, d.Display())
}

func TestSSD1306DriverShowImage(t *testing.T) {
	d := initTestSSDDriver()
	_ = d.Start()
	img := image.NewRGBA(image.Rect(0, 0, 640, 480))
	require.ErrorContains(t, d.ShowImage(img), "Image must match the display width and height")

	img = image.NewRGBA(image.Rect(0, 0, 128, 64))
	require.NoError(t, d.ShowImage(img))
}

type gpioTestAdaptor struct {
	name string
	port string
	mtx  sync.Mutex
	Connector
	digitalWriteFunc func() error
	servoWriteFunc   func() error
	pwmWriteFunc     func() error
	analogReadFunc   func() (val int, err error)
	digitalReadFunc  func() (val int, err error)
}

func (t *gpioTestAdaptor) ServoWrite(string, byte) error {
	t.mtx.Lock()
	defer t.mtx.Unlock()
	return t.servoWriteFunc()
}

func (t *gpioTestAdaptor) PwmWrite(string, byte) error {
	t.mtx.Lock()
	defer t.mtx.Unlock()
	return t.pwmWriteFunc()
}

func (t *gpioTestAdaptor) AnalogRead(string) (int, error) {
	t.mtx.Lock()
	defer t.mtx.Unlock()
	return t.analogReadFunc()
}

func (t *gpioTestAdaptor) DigitalRead(string) (int, error) {
	t.mtx.Lock()
	defer t.mtx.Unlock()
	return t.digitalReadFunc()
}

func (t *gpioTestAdaptor) DigitalWrite(string, byte) error {
	t.mtx.Lock()
	defer t.mtx.Unlock()
	return t.digitalWriteFunc()
}
func (t *gpioTestAdaptor) Connect() error   { return nil }
func (t *gpioTestAdaptor) Finalize() error  { return nil }
func (t *gpioTestAdaptor) Name() string     { return t.name }
func (t *gpioTestAdaptor) SetName(n string) { t.name = n }
func (t *gpioTestAdaptor) Port() string     { return t.port }

func newGpioTestAdaptor() *gpioTestAdaptor {
	a := newSpiTestAdaptor()
	return &gpioTestAdaptor{
		port: "/dev/null",
		digitalWriteFunc: func() error {
			return nil
		},
		servoWriteFunc: func() error {
			return nil
		},
		pwmWriteFunc: func() error {
			return nil
		},
		analogReadFunc: func() (int, error) {
			return 99, nil
		},
		digitalReadFunc: func() (int, error) {
			return 1, nil
		},
		Connector: a,
	}
}