package tests

import (
	"bytes"
	"fmt"
	"net/url"
	//"os"
	"path"
	"strings"
	"testing"

	apiutils "github.com/fnproject/fn/test/fn-api-tests"
	"github.com/fnproject/fn_go/models"
)

func LB() (string, error) {
	lbURL := "http://127.0.0.1:8081"

	u, err := url.Parse(lbURL)
	if err != nil {
		return "", err
	}
	return u.Host, nil
}

func TestCanExecuteFunction(t *testing.T) {
	s := apiutils.SetupHarness()
	s.GivenAppExists(t, &models.App{Name: s.AppName})
	defer s.Cleanup()

	rt := s.BasicRoute()
	rt.Type = "sync"

	s.GivenRouteExists(t, s.AppName, rt)

	lb, err := LB()
	if err != nil {
		t.Fatalf("Got unexpected error: %v", err)
	}
	u := url.URL{
		Scheme: "http",
		Host:   lb,
	}
	u.Path = path.Join(u.Path, "r", s.AppName, s.RoutePath)

	content := &bytes.Buffer{}
	output := &bytes.Buffer{}
	_, err = apiutils.CallFN(u.String(), content, output, "POST", []string{})
	if err != nil {
		t.Errorf("Got unexpected error: %v", err)
	}
	expectedOutput := "Hello World!\n"
	if !strings.Contains(expectedOutput, output.String()) {
		t.Errorf("Assertion error.\n\tExpected: %v\n\tActual: %v", expectedOutput, output.String())
	}
}

func TestBasicConcurrentExecution(t *testing.T) {
	s := apiutils.SetupHarness()

	s.GivenAppExists(t, &models.App{Name: s.AppName})
	defer s.Cleanup()

	rt := s.BasicRoute()
	rt.Type = "sync"

	s.GivenRouteExists(t, s.AppName, rt)

	lb, err := LB()
	if err != nil {
		t.Fatalf("Got unexpected error: %v", err)
	}
	u := url.URL{
		Scheme: "http",
		Host:   lb,
	}
	u.Path = path.Join(u.Path, "r", s.AppName, s.RoutePath)

	results := make(chan error)
	concurrentFuncs := 10
	for i := 0; i < concurrentFuncs; i++ {
		go func() {
			content := &bytes.Buffer{}
			output := &bytes.Buffer{}
			_, err = apiutils.CallFN(u.String(), content, output, "POST", []string{})
			if err != nil {
				results <- fmt.Errorf("Got unexpected error: %v", err)
				return
			}
			expectedOutput := "Hello World!\n"
			if !strings.Contains(expectedOutput, output.String()) {
				results <- fmt.Errorf("Assertion error.\n\tExpected: %v\n\tActual: %v", expectedOutput, output.String())
				return
			}
			results <- nil
		}()
	}
	for i := 0; i < concurrentFuncs; i++ {
		err := <-results
		if err != nil {
			t.Errorf("Error in basic concurrency execution test: %v", err)
		}
	}

}