import { getAtprotoEnv } from "../atproto/env.ts";

export function resolvePublicUrl(request: Request): string {
	return getAtprotoEnv()?.publicUrl ?? new URL(request.url).origin;
}

// Callers interpolate these results straight into href="…", and slugs/handles can
// come from remote records, so anything outside the RFC 3986 unreserved set is
// percent-encoded here rather than at ~25 call sites. ":" is kept: it is a legal
// path character and /@did:plc:… must stay readable.
function seg(segment: string): string {
	return segment.replace(/[^A-Za-z0-9\-._~:]+/gu, (run) =>
		encodeURIComponent(run).replace(
			/[!'()*]/g,
			(c) => `%${c.charCodeAt(0).toString(16).toUpperCase()}`,
		),
	);
}

export function wikiUrl(handle: string, wikiSlug: string): string {
	return `/@${seg(handle)}/${seg(wikiSlug)}`;
}

export function noteUrl(
	handle: string,
	wikiSlug: string,
	noteSlug: string,
): string {
	return `/@${seg(handle)}/${seg(wikiSlug)}/${seg(noteSlug)}`;
}

export function editNoteUrl(
	handle: string,
	wikiSlug: string,
	noteSlug: string,
): string {
	return `${noteUrl(handle, wikiSlug, noteSlug)}/edit`;
}

export function newNoteUrl(handle: string, wikiSlug: string): string {
	return `${wikiUrl(handle, wikiSlug)}/new`;
}

export function settingsUrl(handle: string, wikiSlug: string): string {
	return `${wikiUrl(handle, wikiSlug)}/-/settings`;
}

export function membersUrl(handle: string, wikiSlug: string): string {
	return `${wikiUrl(handle, wikiSlug)}/-/members`;
}

export function sidebarEditUrl(handle: string, wikiSlug: string): string {
	return `${wikiUrl(handle, wikiSlug)}/-/sidebar/edit`;
}

export function profileUrl(didOrHandle: string): string {
	return `/@${seg(didOrHandle)}`;
}

export function exportUrl(handle: string, wikiSlug: string): string {
	return `${wikiUrl(handle, wikiSlug)}/-/export`;
}

export function exportNoteUrl(
	handle: string,
	wikiSlug: string,
	noteSlug: string,
): string {
	return `${noteUrl(handle, wikiSlug, noteSlug)}/-/export`;
}

export function historyNoteUrl(
	handle: string,
	wikiSlug: string,
	noteSlug: string,
): string {
	return `${noteUrl(handle, wikiSlug, noteSlug)}/-/history`;
}

/**
 * Path for the collab WebSocket. The client prepends ws(s):// + host. Note: no
 * `@` before the handle here — it matches the `/collab/:handle/...` route param.
 */
export function collabWsPath(
	handle: string,
	wikiSlug: string,
	noteSlug: string,
): string {
	return `/collab/${seg(handle)}/${seg(wikiSlug)}/${seg(noteSlug)}`;
}

export function redirect(url: string): Response {
	return new Response(null, {
		status: 302,
		headers: { Location: url },
	});
}