package services

import (
	"errors"
	"sync/atomic"
	"testing"

	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/api/layer"
	"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) {
	cl := &ServiceClientGRPC{
		log: zaptest.NewLogger(t),
		clients: []treeClient{
			{address: "node0"},
			{address: "node1"},
			{address: "node2"},
			{address: "node3"},
		},
	}

	makeFn := func(shouldFail []string) func(treeClient) error {
		return func(client treeClient) 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(makeFn([]string{}))
		require.NoError(t, err)
		require.Equal(t, 0, int(atomic.LoadInt32(&cl.startIndex)))
		atomic.StoreInt32(&cl.startIndex, 0)
	})

	t.Run("first failed", func(t *testing.T) {
		err := cl.requestWithRetry(makeFn([]string{"node0"}))
		require.NoError(t, err)
		require.Equal(t, 1, int(atomic.LoadInt32(&cl.startIndex)))
		atomic.StoreInt32(&cl.startIndex, 0)
	})

	t.Run("all failed", func(t *testing.T) {
		err := cl.requestWithRetry(makeFn([]string{"node0", "node1", "node2", "node3"}))
		require.Error(t, err)
		require.Equal(t, 0, int(atomic.LoadInt32(&cl.startIndex)))
		atomic.StoreInt32(&cl.startIndex, 0)
	})

	t.Run("round", func(t *testing.T) {
		err := cl.requestWithRetry(makeFn([]string{"node0", "node1"}))
		require.NoError(t, err)
		require.Equal(t, 2, int(atomic.LoadInt32(&cl.startIndex)))

		err = cl.requestWithRetry(makeFn([]string{"node2", "node3"}))
		require.NoError(t, err)
		require.Equal(t, 0, int(atomic.LoadInt32(&cl.startIndex)))
		atomic.StoreInt32(&cl.startIndex, 0)
	})
}