package rep

import (
	"math/rand"
	"net/http"
	"net/http/httptest"
	"path/filepath"
	"reflect"
	"strings"
	"testing"
	"time"
)

func TestAppHarnessRun(t *testing.T) {
	TestAppHarness{}.Run(t)
}

type TestAppHarness struct {
}

func (h TestAppHarness) Run(t *testing.T) {
	val := reflect.ValueOf(h)
	typ := val.Type()
	for i := 0; i < typ.NumMethod(); i++ {
		method := typ.Method(i)

		if !strings.HasPrefix(method.Name, "Test") {
			continue
		}

		t.Run(method.Name, func(t *testing.T) {
			//t.Parallel()
			rootDir := t.TempDir()

			app1 := newApp(t, rand.Int63(), Config{
				Primary:         true,
				RootDir:         filepath.Join(rootDir, "app1"),
				ReplicationPSK:  "123",
				WALSegMinCount:  1,
				WALSegMaxAgeSec: 1,
				WALSegGCAgeSec:  1,
			})
			defer app1.Close()

			mux := http.NewServeMux()
			mux.HandleFunc("/rep/", app1.rep.Handle)
			testServer := httptest.NewServer(mux)
			defer testServer.Close()

			app2 := newApp(t, rand.Int63(), Config{
				Primary:         false,
				RootDir:         filepath.Join(rootDir, "app2"),
				ReplicationPSK:  "123",
				PrimaryEndpoint: testServer.URL + "/rep/",
				WALSegMinCount:  1,
				WALSegMaxAgeSec: 1,
				WALSegGCAgeSec:  1,
			})

			val.MethodByName(method.Name).Call([]reflect.Value{
				reflect.ValueOf(t),
				reflect.ValueOf(app1),
				reflect.ValueOf(app2),
			})
		})
	}
}

func (TestAppHarness) TestRandomUpdates(t *testing.T, app1, app2 *TestApp) {
	go app1.UpdateRandomFor(4 * time.Second)
	app2.WaitForEOF()
	app1.AssertEqual(t, app2)
}

/*
func (TestAppHarness) TestRandomUpdatesReplay(t *testing.T, app1, app2 *TestApp) {
	app1.UpdateRandomFor(4 * time.Second)
	app2.WaitForEOF()

	app1.Close()
	app1 = newApp(t, app1.ID, app1.rep.conf)

	app1.AssertEqual(t, app2)
	info := app1.rep.Info()
	if info.AppSeqNum != 0 {
		t.Fatal(info)
	}
}

func (TestAppHarness) TestRandomUpdatesAck(t *testing.T, app1, app2 *TestApp) {
	go app1.UpdateRandomFor(4 * time.Second)
	app2.WaitForEOF()
	app1.AssertEqual(t, app2)
	info := app1.rep.Info()
	if info.AppSeqNum == 0 || info.AppSeqNum != info.WALLastSeqNum {
		t.Fatal(info)
	}
}

func (TestAppHarness) TestWriteThenOpenFollower(t *testing.T, app1, app2 *TestApp) {
	app2.Close()
	app1.UpdateRandomFor(4 * time.Second)

	app2 = newApp(t, app2.ID, app2.rep.conf)
	app2.WaitForEOF()
	app1.AssertEqual(t, app2)
}

func (TestAppHarness) TestUpdateOpenFollowerConcurrently(t *testing.T, app1, app2 *TestApp) {
	app2.Close()
	go app1.UpdateRandomFor(4 * time.Second)
	time.Sleep(2 * time.Second)
	app2 = newApp(t, app2.ID, app2.rep.conf)
	app2.WaitForEOF()
	app1.AssertEqual(t, app2)
}

func (TestAppHarness) TestUpdateCloseOpenFollowerConcurrently(t *testing.T, app1, app2 *TestApp) {
	go app1.UpdateRandomFor(4 * time.Second)

	time.Sleep(time.Second)
	app2.Close()
	time.Sleep(time.Second)
	app2 = newApp(t, app2.ID, app2.rep.conf)
	app2.WaitForEOF()
	app1.AssertEqual(t, app2)
}
*/