import * as Linking from "expo-linking";

export type ShortcutAction = "clock-in" | "clock-out" | "open-timer";

export type ParsedShortcut = {
  action: ShortcutAction;
  title: string;
  clientId: string;
};

function queryParam(value: string | string[] | undefined): string {
  if (Array.isArray(value)) return value[0] ?? "";
  return value ?? "";
}

function normalizeShortcutPath(hostname: string | null, path: string | null): string | null {
  const host = (hostname ?? "").replace(/^\/+|\/+$/g, "");
  const segment = (path ?? "").replace(/^\/+|\/+$/g, "");

  if (host === "shortcuts" && segment) {
    return segment;
  }

  const combined = [host, segment].filter(Boolean).join("/");
  const match = combined.match(/(?:^|\/)shortcuts\/(clock-in|clock-out)$/);
  if (match?.[1]) return match[1];

  if (combined === "clock-in" || combined === "clock-out") {
    return combined;
  }

  return null;
}

/** Parse `beenvoice://shortcuts/clock-in` and related URLs from Shortcuts / Siri. */
export function parseShortcutUrl(url: string | null | undefined): ParsedShortcut | null {
  if (!url) return null;

  const parsed = Linking.parse(url);
  if (parsed.scheme !== "beenvoice") return null;

  const path = (parsed.path ?? "").replace(/^\/+/, "");
  const host = parsed.hostname ?? "";

  if (path === "timer" || host === "timer") {
    return { action: "open-timer", title: "", clientId: "" };
  }

  const shortcutAction = normalizeShortcutPath(host, path);
  if (shortcutAction === "clock-in" || shortcutAction === "clock-out") {
    return {
      action: shortcutAction,
      title: queryParam(parsed.queryParams?.title),
      clientId: queryParam(parsed.queryParams?.clientId),
    };
  }

  return null;
}

export const SHORTCUT_URLS = {
  timer: "beenvoice://timer",
  clockIn: "beenvoice://shortcuts/clock-in",
  clockOut: "beenvoice://shortcuts/clock-out",
} as const;