export function buildPublicShareEditHref(
  token: string,
  filePath: string,
  returnTo?: string,
  mode: "edit" | "view" = "edit",
  displayName?: string
): string {
  const trimmed = filePath.replace(/^\/+|\/+$/g, "")
  const base = `/drive/s/${encodeURIComponent(token)}/edit/${trimmed.split("/").map(encodeURIComponent).join("/")}`
  const params = new URLSearchParams()
  if (returnTo && returnTo.startsWith("/drive/s/")) {
    params.set("returnTo", returnTo)
  }
  if (mode === "view") {
    params.set("mode", "view")
  }
  if (displayName?.trim()) {
    params.set("name", displayName.trim())
  }
  const qs = params.toString()
  return qs ? `${base}?${qs}` : base
}

export function resolvePublicShareEditReturnTo(
  token: string,
  returnTo: string | null | undefined,
  filePath: string
): string {
  if (returnTo && returnTo.startsWith("/drive/s/")) return returnTo
  const parent = filePath.replace(/\/[^/]+$/, "") || "/"
  const trimmed = parent.replace(/^\/+|\/+$/g, "")
  if (!trimmed) return `/drive/s/${encodeURIComponent(token)}`
  return `/drive/s/${encodeURIComponent(token)}/${trimmed.split("/").map(encodeURIComponent).join("/")}`
}

export function filePathFromPublicEditSegments(
  token: string,
  segments: string[] | undefined
): string {
  if (!segments?.length) return "/"
  return "/" + segments.map((s) => decodeURIComponent(s)).join("/")
}