package namecheap

import (
	"fmt"
	"time"
)

func (c *Client) WaitForDNSPropagation(domain, subdomain, expectedIP string, timeout time.Duration) error {
	deadline := time.Now().Add(timeout)
	backoff := 5 * time.Second
	maxBackoff := 80 * time.Second

	for {
		if time.Now().After(deadline) {
			return fmt.Errorf("timeout waiting for DNS propagation")
		}

		records, err := c.ListDNSRecords(domain)
		if err != nil {
			return fmt.Errorf("failed to check DNS records: %w", err)
		}

		for _, record := range records {
			if record.Name == subdomain && record.Address == expectedIP {
				return nil
			}
		}

		time.Sleep(backoff)
		if backoff < maxBackoff {
			backoff *= 2
		}
	}
}