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package duration
import (
"errors"
"fmt"
"regexp"
"strconv"
"strings"
"time"
)
var bareIntegerPattern = regexp.MustCompile(`^[+-]?\d+$`)
const (
maxInt64 = int64(^uint64(0) >> 1)
minInt64 = -maxInt64 - 1
)
// Parse converts duration text into time.Duration.
// Go-style durations (e.g. "1h30m") are supported, and bare integers are seconds.
func Parse(value string) (time.Duration, error) {
trimmed := strings.TrimSpace(value)
if trimmed == "" {
return 0, errors.New("duration must not be empty")
}
if bareIntegerPattern.MatchString(trimmed) {
seconds, err := strconv.ParseInt(trimmed, 10, 64)
if err != nil {
return 0, fmt.Errorf("parse seconds %q: %w", value, err)
}
if seconds > maxInt64/int64(time.Second) || seconds < minInt64/int64(time.Second) {
return 0, fmt.Errorf("duration seconds %q overflows time.Duration", value)
}
return time.Duration(seconds) * time.Second, nil
}
parsed, err := time.ParseDuration(trimmed)
if err != nil {
return 0, fmt.Errorf("parse duration %q: %w", value, err)
}
return parsed, nil
}
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