package clocktime

import (
	"fmt"
	"time"

	"github.com/sosodev/duration"
)

// ISODuration wraps time.Duration with ISO 8601 string formatting.
type ISODuration time.Duration

// NewISODuration creates a duration from hour, minute, and second components.
func NewISODuration(hours, minutes, seconds int) ISODuration {
	return ISODuration(
		time.Hour*time.Duration(hours) +
			time.Minute*time.Duration(minutes) +
			time.Second*time.Duration(seconds),
	)
}

// ParseISODuration parses an ISO 8601 duration string (for example PT1H30M).
func ParseISODuration(s string) (ISODuration, error) {
	return DurationFromISOString(s)
}

// DurationFromISOString parses an ISO 8601 duration string.
func DurationFromISOString(s string) (ISODuration, error) {
	d, err := duration.Parse(s)
	if err != nil {
		return 0, fmt.Errorf("error parsing ISO 8601 duration: %w", err)
	}
	return ISODuration(d.ToTimeDuration()), nil
}

// ISODurationFromDuration converts a time.Duration to ISODuration.
func ISODurationFromDuration(d time.Duration) ISODuration {
	return ISODuration(d)
}

// String returns the ISO 8601 representation.
func (d ISODuration) String() string {
	return duration.FromTimeDuration(time.Duration(d)).String()
}

// Duration returns the underlying time.Duration.
func (d ISODuration) Duration() time.Duration {
	return time.Duration(d)
}