package gobot

import (
	"errors"
	"fmt"
	"log"
	"os"
	"testing"
	"time"

	multierror "github.com/hashicorp/go-multierror"
	"gobot.io/x/gobot/v2/gobottest"
)

func initTestMaster() *Master {
	log.SetOutput(&NullReadWriteCloser{})
	g := NewMaster()
	g.trap = func(c chan os.Signal) {
		c <- os.Interrupt
	}
	g.AddRobot(newTestRobot("Robot1"))
	g.AddRobot(newTestRobot("Robot2"))
	g.AddRobot(newTestRobot(""))
	return g
}

func initTestMaster1Robot() *Master {
	log.SetOutput(&NullReadWriteCloser{})
	g := NewMaster()
	g.trap = func(c chan os.Signal) {
		c <- os.Interrupt
	}
	g.AddRobot(newTestRobot("Robot99"))

	return g
}

func TestNullReadWriteCloser(t *testing.T) {
	n := &NullReadWriteCloser{}
	i, _ := n.Write([]byte{1, 2, 3})
	gobottest.Assert(t, i, 3)
	i, _ = n.Read(make([]byte, 10))
	gobottest.Assert(t, i, 10)
	gobottest.Assert(t, n.Close(), nil)
}

func TestMasterRobot(t *testing.T) {
	g := initTestMaster()
	gobottest.Assert(t, g.Robot("Robot1").Name, "Robot1")
	gobottest.Assert(t, g.Robot("Robot4"), (*Robot)(nil))
	gobottest.Assert(t, g.Robot("Robot4").Device("Device1"), (Device)(nil))
	gobottest.Assert(t, g.Robot("Robot4").Connection("Connection1"), (Connection)(nil))
	gobottest.Assert(t, g.Robot("Robot1").Device("Device4"), (Device)(nil))
	gobottest.Assert(t, g.Robot("Robot1").Device("Device1").Name(), "Device1")
	gobottest.Assert(t, g.Robot("Robot1").Devices().Len(), 3)
	gobottest.Assert(t, g.Robot("Robot1").Connection("Connection4"), (Connection)(nil))
	gobottest.Assert(t, g.Robot("Robot1").Connections().Len(), 3)
}

func TestMasterToJSON(t *testing.T) {
	g := initTestMaster()
	g.AddCommand("test_function", func(params map[string]interface{}) interface{} {
		return nil
	})
	json := NewJSONMaster(g)
	gobottest.Assert(t, len(json.Robots), g.Robots().Len())
	gobottest.Assert(t, len(json.Commands), len(g.Commands()))
}

func TestMasterStart(t *testing.T) {
	g := initTestMaster()
	gobottest.Assert(t, g.Start(), nil)
	gobottest.Assert(t, g.Stop(), nil)
	gobottest.Assert(t, g.Running(), false)
}

func TestMasterStartAutoRun(t *testing.T) {
	g := NewMaster()
	g.AddRobot(newTestRobot("Robot99"))
	go func() { _ = g.Start() }()
	time.Sleep(10 * time.Millisecond)
	gobottest.Assert(t, g.Running(), true)

	// stop it
	gobottest.Assert(t, g.Stop(), nil)
	gobottest.Assert(t, g.Running(), false)
}

func TestMasterStartDriverErrors(t *testing.T) {
	g := initTestMaster1Robot()
	e := errors.New("driver start error 1")
	testDriverStart = func() (err error) {
		return e
	}

	var want error
	want = multierror.Append(want, e)
	want = multierror.Append(want, e)
	want = multierror.Append(want, e)

	gobottest.Assert(t, g.Start(), want)
	gobottest.Assert(t, g.Stop(), nil)

	testDriverStart = func() (err error) { return }
}

func TestMasterHaltFromRobotDriverErrors(t *testing.T) {
	g := initTestMaster1Robot()
	var ec int
	testDriverHalt = func() (err error) {
		ec++
		return fmt.Errorf("driver halt error %d", ec)
	}
	defer func() { testDriverHalt = func() error { return nil } }()

	var want error
	for i := 1; i <= 3; i++ {
		e := fmt.Errorf("driver halt error %d", i)
		want = multierror.Append(want, e)
	}

	gobottest.Assert(t, g.Start(), want)
}

func TestMasterStartRobotAdaptorErrors(t *testing.T) {
	g := initTestMaster1Robot()
	var ec int
	testAdaptorConnect = func() (err error) {
		ec++
		return fmt.Errorf("adaptor start error %d", ec)
	}
	defer func() { testAdaptorConnect = func() error { return nil } }()

	var want error
	for i := 1; i <= 3; i++ {
		e := fmt.Errorf("adaptor start error %d", i)
		want = multierror.Append(want, e)
	}

	gobottest.Assert(t, g.Start(), want)
	gobottest.Assert(t, g.Stop(), nil)

	testAdaptorConnect = func() (err error) { return }
}

func TestMasterFinalizeErrors(t *testing.T) {
	g := initTestMaster1Robot()
	var ec int
	testAdaptorFinalize = func() (err error) {
		ec++
		return fmt.Errorf("adaptor finalize error %d", ec)
	}
	defer func() { testAdaptorFinalize = func() error { return nil } }()

	var want error
	for i := 1; i <= 3; i++ {
		e := fmt.Errorf("adaptor finalize error %d", i)
		want = multierror.Append(want, e)
	}

	gobottest.Assert(t, g.Start(), want)
}