package usecase

import (
	"time"

	notifconfig "gateway/internal/model/notification/config"
)

const defaultMaxRetry = 5

func effectiveMaxRetry(cfg notifconfig.AsyncConfig) int {
	if cfg.MaxRetry > 0 {
		return cfg.MaxRetry
	}
	return defaultMaxRetry
}

// retryDelay returns wait duration before attempt number `nextAttempt` (1-based).
func retryDelay(cfg notifconfig.AsyncConfig, nextAttempt int) time.Duration {
	if nextAttempt < 1 {
		nextAttempt = 1
	}
	secs := cfg.BackoffSeconds
	if len(secs) == 0 {
		secs = []int{1, 5, 30, 300, 1800}
	}
	idx := nextAttempt - 1
	if idx >= len(secs) {
		idx = len(secs) - 1
	}
	return time.Duration(secs[idx]) * time.Second
}