package nws

import (
	"fmt"
	"strings"
	"time"
)

// ParseTime parses NWS timestamps.
//
// NWS observation timestamps are typically RFC3339, sometimes with fractional seconds.
// We accept RFC3339Nano first, then RFC3339.
func ParseTime(s string) (time.Time, error) {
	s = strings.TrimSpace(s)
	if s == "" {
		return time.Time{}, fmt.Errorf("empty time")
	}

	if t, err := time.Parse(time.RFC3339Nano, s); err == nil {
		return t, nil
	}
	if t, err := time.Parse(time.RFC3339, s); err == nil {
		return t, nil
	}

	return time.Time{}, fmt.Errorf("unsupported NWS timestamp format: %q", s)
}