package client

import (
	"errors"
	"flag"
	"os"
	"testing"
	"time"
)

const (
	TestStr = "Hello world"
)

var (
	client              *Client
	runIntegrationTests bool
)

func TestMain(m *testing.M) {
	integrationsTestFlag := flag.Bool("integration", false, "Run the integration tests (in addition to the unit tests)")
	flag.Parse()
	if integrationsTestFlag != nil {
		runIntegrationTests = *integrationsTestFlag
	}
	code := m.Run()
	os.Exit(code)
}

func TestClientAddServer(t *testing.T) {
	if !runIntegrationTests {
		t.Skip("To run this test, use: go test -integration")
	}
	t.Log("Add local server 127.0.0.1:4730")
	var err error
	if client, err = New(Network, "127.0.0.1:4730"); err != nil {
		t.Fatal(err)
	}
	client.ErrorHandler = func(e error) {
		t.Log(e)
	}
}

func TestClientEcho(t *testing.T) {
	if !runIntegrationTests {
		t.Skip("To run this test, use: go test -integration")
	}
	echo, err := client.Echo([]byte(TestStr))
	if err != nil {
		t.Error(err)
		return
	}
	if string(echo) != TestStr {
		t.Errorf("Echo error, %s expected, %s got", TestStr, echo)
		return
	}
}

func TestClientDoBg(t *testing.T) {
	if !runIntegrationTests {
		t.Skip("To run this test, use: go test -integration")
	}
	handle, err := client.DoBg("ToUpper", []byte("abcdef"), JobLow)
	if err != nil {
		t.Error(err)
		return
	}
	if handle == "" {
		t.Error("Handle is empty.")
	} else {
		t.Log(handle)
	}
}

func TestClientDo(t *testing.T) {
	if !runIntegrationTests {
		t.Skip("To run this test, use: go test -integration")
	}
	jobHandler := func(job *Response) {
		str := string(job.Data)
		if str == "ABCDEF" {
			t.Log(str)
		} else {
			t.Errorf("Invalid data: %s", job.Data)
		}
		return
	}
	handle, err := client.Do("ToUpper", []byte("abcdef"),
		JobLow, jobHandler)
	if err != nil {
		t.Error(err)
		return
	}
	if handle == "" {
		t.Error("Handle is empty.")
	} else {
		t.Log(handle)
	}
}

func TestClientMultiDo(t *testing.T) {
	if !runIntegrationTests {
		t.Skip("To run this test, use: go test -integration")
	}

	// This integration test requires that examples/pl/worker_multi.pl be running.
	//
	// Test invocation is:
	//    go test -integration -timeout 10s -run '^TestClient(AddServer|MultiDo)$'
	//
	// Send 1000 requests to go through all race conditions
	const nreqs = 1000
	errCh := make(chan error)
	gotCh := make(chan string, nreqs)

	olderrh := client.ErrorHandler
	client.ErrorHandler = func(e error) { errCh <- e }
	client.ResponseTimeout = 5 * time.Second
	defer func() { client.ErrorHandler = olderrh }()

	nextJobCh := make(chan struct{})
	defer close(nextJobCh)
	go func() {
		for range nextJobCh {
			start := time.Now()
			handle, err := client.Do("PerlToUpper", []byte("abcdef"), JobNormal, func(r *Response) { gotCh <- string(r.Data) })
			if err == ErrLostConn && time.Since(start) > client.ResponseTimeout {
				errCh <- errors.New("Impossible 'lost conn', deadlock bug detected")
			} else if err != nil {
				errCh <- err
			}
			if handle == "" {
				errCh <- errors.New("Handle is empty.")
			}
		}
	}()

	for i := 0; i < nreqs; i++ {
		select {
		case err := <-errCh:
			t.Fatal(err)
		case nextJobCh <- struct{}{}:
		}
	}

	remaining := nreqs
	for remaining > 0 {
		select {
		case err := <-errCh:
			t.Fatal(err)
		case got := <-gotCh:
			if got != "ABCDEF" {
				t.Error("Unexpected response from PerlDoUpper: ", got)
			}
			remaining--
			t.Logf("%d response remaining", remaining)
		}
	}
}

func TestClientStatus(t *testing.T) {
	if !runIntegrationTests {
		t.Skip("To run this test, use: go test -integration")
	}
	status, err := client.Status("handle not exists")
	if err != nil {
		t.Error(err)
		return
	}
	if status.Known {
		t.Errorf("The job (%s) shouldn't be known.", status.Handle)
		return
	}
	if status.Running {
		t.Errorf("The job (%s) shouldn't be running.", status.Handle)
		return
	}

	handle, err := client.Do("Delay5sec", []byte("abcdef"), JobLow, nil)
	if err != nil {
		t.Error(err)
		return
	}
	status, err = client.Status(handle)
	if err != nil {
		t.Error(err)
		return
	}
	if !status.Known {
		t.Errorf("The job (%s) should be known.", status.Handle)
		return
	}
	if status.Running {
		t.Errorf("The job (%s) shouldn't be running.", status.Handle)
		return
	}
}

func TestClientClose(t *testing.T) {
	if !runIntegrationTests {
		t.Skip("To run this test, use: go test -integration")
	}
	if err := client.Close(); err != nil {
		t.Error(err)
	}
}