package router

import (
	"regexp"
	"strings"
)

// Finding a URL in an utterance (Vikunja #259).
//
// This is deliberately strict: a scheme is required. "посмотри на example.org"
// is not treated as a fetch request, because a bare dotted word is also how
// people say file names, versions and Russian abbreviations, and the cost of a
// false positive here is an outbound request nobody asked for.
//
// Note where this runs: an utterance from STT. Whisper will mangle a spoken URL,
// which is fine — the URL that survives is one he pasted into the web chat, and
// a mangled one simply fails to match.
var urlRE = regexp.MustCompile(`(?i)\bhttps?://[^\s<>"']+`)

// FirstURL returns the first http(s) URL in text.
//
// Trailing punctuation is trimmed: he ends sentences, and "…/page." is not a
// path component. A closing bracket is only trimmed when it has no opener,
// because a wikipedia URL legitimately ends in one.
func FirstURL(text string) (string, bool) {
	m := urlRE.FindString(text)
	if m == "" {
		return "", false
	}
	m = strings.TrimRight(m, ".,;:!?…")
	if strings.HasSuffix(m, ")") && strings.Count(m, "(") == 0 {
		m = strings.TrimSuffix(m, ")")
	}
	// A scheme with nothing after it is not a URL.
	if rest := strings.SplitN(m, "//", 2); len(rest) < 2 || rest[1] == "" {
		return "", false
	}
	return m, true
}