/**
 * Resolve a package-app path against a relative data-base and the page origin.
 * `new URL(path, '/packages/lineage/')` throws in browsers.
 */
export function resolveAppUrl(base: string, path: string, origin: string): string {
	const root = new URL(base || '/', origin)
	if (!root.pathname.endsWith('/')) root.pathname += '/'
	return new URL(String(path).replace(/^\//, ''), root).toString()
}

export function scopedAssetPath(scope: string, path: string): string {
	const root = scope.endsWith('/') ? scope : `${scope}/`
	return `${root}${String(path).replace(/^\//, '')}`
}

/** Default max scope for `sw.js` at `/packages/foo/sw.js` — trailing slash, no host header required. */
export function serviceWorkerScope(base: string, origin: string): string {
	const root = new URL(base || '/', origin)
	if (!root.pathname.endsWith('/')) root.pathname += '/'
	return root.href
}

export function shouldCanonicalizeClientPath(pathname: string): boolean {
	return Boolean(pathname) && !pathname.endsWith('/')
}

export function serviceWorkerAllowedPath(base: string): string {
	const path = base.startsWith('/') ? base : `/${base}`
	return path.endsWith('/') && path !== '/' ? path.slice(0, -1) : path
}

export function needsCanonicalAppRedirect(pathname: string, appBasePath: string): boolean {
	return pathname === appBasePath
}