package config

import (
	"fmt"
	"time"
)

// Duration is a time.Duration that can be unmarshalled from a TOML string
// (e.g., "30s", "5m"). go-toml v2 does not natively decode strings into
// time.Duration, so this wrapper implements encoding.TextUnmarshaler.
type Duration struct {
	time.Duration
}

// UnmarshalText implements encoding.TextUnmarshaler for TOML string decoding.
func (d *Duration) UnmarshalText(text []byte) error {
	parsed, err := time.ParseDuration(string(text))
	if err != nil {
		return fmt.Errorf("invalid duration %q: %w", string(text), err)
	}
	d.Duration = parsed
	return nil
}

// MarshalText implements encoding.TextMarshaler for TOML string encoding.
func (d Duration) MarshalText() ([]byte, error) {
	return []byte(d.String()), nil
}