package notify

import (
	"context"
	"errors"
	"net"
	"testing"
)

func TestReconnectClientRejectsDirectConnSource(t *testing.T) {
	client := NewClient().(*ClientCommon)
	secret := []byte("0123456789abcdef0123456789abcdef")
	left, right := net.Pipe()
	defer left.Close()
	defer right.Close()

	server := newRunningPeerAttachServerForTest(t, func(server *ServerCommon) {
		server.SetSecretKey(secret)
	})
	bootstrapPeerAttachConnForTest(t, server, right)

	client.SetSecretKey(secret)
	if err := client.ConnectByConn(left); err != nil {
		t.Fatalf("ConnectByConn failed: %v", err)
	}
	client.setByeFromServer(true)
	if err := client.Stop(); err != nil {
		t.Fatalf("Stop failed: %v", err)
	}

	err := ReconnectClient(context.Background(), client)
	if !errors.Is(err, errClientReconnectSourceUnavailable) {
		t.Fatalf("ReconnectClient error = %v, want %v", err, errClientReconnectSourceUnavailable)
	}
}

func TestReconnectClientWithFactorySource(t *testing.T) {
	client := NewClient().(*ClientCommon)
	secret := []byte("0123456789abcdef0123456789abcdef")
	client.SetSecretKey(secret)
	server := newRunningPeerAttachServerForTest(t, func(server *ServerCommon) {
		server.SetSecretKey(secret)
	})

	dialCount := 0
	var peers []net.Conn
	dialFn := func(context.Context) (net.Conn, error) {
		dialCount++
		left, right := net.Pipe()
		peers = append(peers, right)
		bootstrapPeerAttachConnForTest(t, server, right)
		return left, nil
	}

	if err := client.ConnectByFactory(context.Background(), dialFn); err != nil {
		t.Fatalf("ConnectByFactory failed: %v", err)
	}
	client.setByeFromServer(true)
	if err := client.Stop(); err != nil {
		t.Fatalf("Stop failed: %v", err)
	}

	before, err := GetClientRuntimeSnapshot(client)
	if err != nil {
		t.Fatalf("GetClientRuntimeSnapshot before reconnect failed: %v", err)
	}
	if !before.CanReconnect || before.ConnectSource != clientConnectSourceFactory {
		t.Fatalf("unexpected reconnect snapshot before reconnect: %+v", before)
	}

	if err := ReconnectClient(context.Background(), client); err != nil {
		t.Fatalf("ReconnectClient failed: %v", err)
	}
	after, err := GetClientRuntimeSnapshot(client)
	if err != nil {
		t.Fatalf("GetClientRuntimeSnapshot after reconnect failed: %v", err)
	}
	if !after.Alive || !after.HasRuntimeConn || !after.CanReconnect {
		t.Fatalf("unexpected reconnect snapshot after reconnect: %+v", after)
	}
	if got, want := dialCount, 2; got != want {
		t.Fatalf("dial count mismatch: got %d want %d", got, want)
	}

	client.setByeFromServer(true)
	if err := client.Stop(); err != nil {
		t.Fatalf("final Stop failed: %v", err)
	}
	for _, peer := range peers {
		_ = peer.Close()
	}
}

func TestReconnectClientWithRetryRecordsRetryState(t *testing.T) {
	client := NewClient().(*ClientCommon)
	secret := []byte("0123456789abcdef0123456789abcdef")
	client.SetSecretKey(secret)
	server := newRunningPeerAttachServerForTest(t, func(server *ServerCommon) {
		server.SetSecretKey(secret)
	})

	dialCount := 0
	wantErr := errors.New("dial failed once")
	var peers []net.Conn
	dialFn := func(context.Context) (net.Conn, error) {
		dialCount++
		if dialCount == 2 {
			return nil, wantErr
		}
		left, right := net.Pipe()
		peers = append(peers, right)
		bootstrapPeerAttachConnForTest(t, server, right)
		return left, nil
	}

	if err := client.ConnectByFactory(context.Background(), dialFn); err != nil {
		t.Fatalf("ConnectByFactory failed: %v", err)
	}
	client.setByeFromServer(true)
	if err := client.Stop(); err != nil {
		t.Fatalf("Stop failed: %v", err)
	}

	if err := ReconnectClientWithRetry(context.Background(), client, &ConnectRetryOptions{
		MaxAttempts: 3,
		BaseDelay:   0,
		MaxDelay:    0,
	}); err != nil {
		t.Fatalf("ReconnectClientWithRetry failed: %v", err)
	}
	snapshot, err := GetClientRuntimeSnapshot(client)
	if err != nil {
		t.Fatalf("GetClientRuntimeSnapshot failed: %v", err)
	}
	if got, want := snapshot.Retry.RetryEventTotal, uint64(1); got != want {
		t.Fatalf("retry events mismatch: got %d want %d", got, want)
	}
	if got, want := snapshot.Retry.LastRetryAttempt, 1; got != want {
		t.Fatalf("last retry attempt mismatch: got %d want %d", got, want)
	}
	if got, want := snapshot.Retry.LastRetryError, wantErr.Error(); got != want {
		t.Fatalf("last retry error mismatch: got %q want %q", got, want)
	}
	if snapshot.Retry.LastResultError != "" {
		t.Fatalf("last result error should be empty, got %q", snapshot.Retry.LastResultError)
	}
	if got, want := dialCount, 3; got != want {
		t.Fatalf("dial count mismatch: got %d want %d", got, want)
	}

	client.setByeFromServer(true)
	if err := client.Stop(); err != nil {
		t.Fatalf("final Stop failed: %v", err)
	}
	for _, peer := range peers {
		_ = peer.Close()
	}
}