package pipeline

import "strings"

// AutoSpanForHint returns a suggested refinement span based on the candidate hint.
// It is intentionally conservative: spans are wide enough for robust demod/classify,
// but not so wide that refinement becomes wasteful.
func AutoSpanForHint(hint string) (float64, string) {
	h := strings.ToLower(hint)
	switch {
	case strings.Contains(h, "wfm"):
		return 200000, "auto:wfm"
	case strings.Contains(h, "nfm"):
		return 18000, "auto:nfm"
	case strings.Contains(h, "usb") || strings.Contains(h, "lsb") || strings.Contains(h, "ssb"):
		return 6000, "auto:ssb"
	case strings.Contains(h, "cw"):
		return 500, "auto:cw"
	case strings.Contains(h, "dmr") || strings.Contains(h, "d-star") || strings.Contains(h, "dstar"):
		return 15000, "auto:dig_voice"
	case strings.Contains(h, "ft8") || strings.Contains(h, "wspr"):
		return 4000, "auto:dig_weak"
	case strings.Contains(h, "fsk") || strings.Contains(h, "psk"):
		return 6000, "auto:dig"
	case strings.Contains(h, "am"):
		return 12000, "auto:am"
	default:
		return 0, ""
	}
}