package retryer

import (
	"context"
	"errors"
	"testing"
	"time"

	"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/pkg/service/tree"
	"github.com/aws/aws-sdk-go-v2/aws"
	"github.com/aws/aws-sdk-go-v2/aws/retry"
	"github.com/stretchr/testify/require"
)

func TestRetryer(t *testing.T) {
	ctx := context.Background()

	retryer := retry.NewStandard(func(options *retry.StandardOptions) {
		options.MaxAttempts = 3
		options.Backoff = retry.BackoffDelayerFunc(func(int, error) (time.Duration, error) { return 0, nil })
		options.Retryables = []retry.IsErrorRetryable{retry.IsErrorRetryableFunc(func(err error) aws.Ternary {
			if errors.Is(err, tree.ErrNodeAccessDenied) {
				return aws.TrueTernary
			}
			return aws.FalseTernary
		})}
	})

	t.Run("no retryable", func(t *testing.T) {
		count := 0
		err := MakeWithRetry(ctx, func() error {
			count++
			if count == 1 {
				return tree.ErrNodeNotFound
			}
			return tree.ErrNodeAccessDenied
		}, retryer)
		require.ErrorIs(t, err, tree.ErrNodeNotFound)
	})

	t.Run("retry", func(t *testing.T) {
		count := 0
		err := MakeWithRetry(ctx, func() error {
			count++
			if count < 3 {
				return tree.ErrNodeAccessDenied
			}
			return nil
		}, retryer)
		require.NoError(t, err)
	})

	t.Run("retry exhausted", func(t *testing.T) {
		err := MakeWithRetry(ctx, func() error {
			return tree.ErrNodeAccessDenied
		}, retryer)
		require.ErrorIs(t, err, tree.ErrNodeAccessDenied)
	})
}