// Package retry provides a helper for retrying operations with configurable backoff.

package retry

import (

	"context"

	"time"

)

// WithBackoff calls fn up to maxAttempts times, pausing delay between each attempt.

// It returns nil as soon as fn returns nil.

// If ctx is cancelled during a backoff sleep, the helper must return ctx.Err()

// immediately without completing the sleep or making another attempt.

// Parameters: ctx — controls cancellation and deadline; fn — the operation to retry;

// maxAttempts — total number of calls including the first; delay — pause between retries.

func WithBackoff(ctx context.Context, maxAttempts int, delay time.Duration, fn func(context.Context) error) error {

	var err error

	for i := 0; i < maxAttempts; i++ {

		err = fn(ctx)

		if err == nil {

			return nil

		}

		if i < maxAttempts-1 {

			time.Sleep(delay)

		}

	}

	return err

}