package linknorm

import (
	"strings"
	"unicode"
)

// SanitizeShareText strips BOM, bidi isolates and zero-width chars that break
// scheme detection (common when pasting from messengers / Amnezia share).
func SanitizeShareText(raw string) string {
	raw = strings.TrimPrefix(raw, "\ufeff")
	raw = strings.TrimSpace(raw)
	if raw == "" {
		return ""
	}
	var b strings.Builder
	b.Grow(len(raw))
	for _, r := range raw {
		switch r {
		case '\u200b', '\u200c', '\u200d', '\u2060', '\ufeff', // zero-width / BOM
			'\u2066', '\u2067', '\u2068', '\u2069', // LRI/RLI/FSI/PDI
			'\u200e', '\u200f', // LRM/RLM
			'\u202a', '\u202b', '\u202c', '\u202d', '\u202e': // embedding overrides
			continue
		}
		if r < 0x20 && r != '\n' && r != '\r' && r != '\t' {
			continue
		}
		if unicode.Is(unicode.Cf, r) { // other format controls
			continue
		}
		b.WriteRune(r)
	}
	return strings.TrimSpace(b.String())
}