package services

import (
	"context"
	"errors"
	"google.golang.org/grpc"
	"google.golang.org/grpc/credentials/insecure"
	"testing"

	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs/services/client"
	grpcService "git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/frostfs/services/tree"
	"github.com/stretchr/testify/require"
	"go.uber.org/zap/zaptest"
)

func TestHandleError(t *testing.T) {
	defaultError := errors.New("default error")
	for _, tc := range []struct {
		err           error
		expectedError error
	}{
		{
			err:           defaultError,
			expectedError: defaultError,
		},
		{
			err:           errors.New("something not found"),
			expectedError: layer.ErrNodeNotFound,
		},
		{
			err:           errors.New("something is denied by some acl rule"),
			expectedError: layer.ErrNodeAccessDenied,
		},
	} {
		t.Run("", func(t *testing.T) {
			err := handleError("err message", tc.err)
			require.True(t, errors.Is(err, tc.expectedError))
		})
	}
}

func TestRetry(t *testing.T) {
	ctx := context.Background()
	log := zaptest.NewLogger(t)

	grpcDialOpt := grpc.WithTransportCredentials(insecure.NewCredentials())
	cl := &ServiceClientGRPC{
		log: zaptest.NewLogger(t),
		clients: []*client.TreeClient{
			client.NewTreeClient("node0", grpcDialOpt),
			client.NewTreeClient("node1", grpcDialOpt),
			client.NewTreeClient("node2", grpcDialOpt),
			client.NewTreeClient("node3", grpcDialOpt),
		},
	}

	makeFn := func(shouldFail []string) func(grpcService.TreeServiceClient) error {
		return func(client grpcService.TreeServiceClient) error {

			//for _, item := range shouldFail {
			//if item == client.address {
			//	return errors.New("not found")
			//}
			//}
			return nil
		}
	}

	t.Run("first ok", func(t *testing.T) {
		err := cl.requestWithRetry(ctx, log, makeFn([]string{}))
		require.NoError(t, err)
		require.Equal(t, 0, cl.getStartIndex())
		cl.setStartIndex(0)
	})

	t.Run("first failed", func(t *testing.T) {
		err := cl.requestWithRetry(ctx, log, makeFn([]string{"node0"}))
		require.NoError(t, err)
		require.Equal(t, 1, cl.getStartIndex())
		cl.setStartIndex(0)
	})

	t.Run("all failed", func(t *testing.T) {
		err := cl.requestWithRetry(ctx, log, makeFn([]string{"node0", "node1", "node2", "node3"}))
		require.Error(t, err)
		require.Equal(t, 0, cl.getStartIndex())
		cl.setStartIndex(0)
	})

	t.Run("round", func(t *testing.T) {
		err := cl.requestWithRetry(ctx, log, makeFn([]string{"node0", "node1"}))
		require.NoError(t, err)
		require.Equal(t, 2, cl.getStartIndex())

		err = cl.requestWithRetry(ctx, log, makeFn([]string{"node2", "node3"}))
		require.NoError(t, err)
		require.Equal(t, 0, cl.getStartIndex())
		cl.setStartIndex(0)
	})
}