import { loadTrip } from "@/lib/tripStorage";

type LoginDict = {
  hintExplore: string;
  hintProfile: string;
  hintPlan: string;
  hintCompare: string;
  hintTools: string;
  hintDestination: string;
  hintDating: string;
  hintChat: string;
  hintMeetups: string;
  hintJoin: string;
  hintNotifications: string;
  hintGigs: string;
  hintCommunity: string;
  hintSubmit: string;
  redirectTo: string;
  planMergeNote: string;
  destHome: string;
  destProfile: string;
  destPlan: string;
  destCompare: string;
  destTools: string;
  destDestination: string;
  destDating: string;
  destChat: string;
  destMeetups: string;
  destJoin: string;
  destNotifications: string;
  destGigs: string;
  destCommunity: string;
  destSubmit: string;
  submitLoginDefault: string;
  submitLoginPlan: string;
  demoHintDefault: string;
  demoHintPlan: string;
  welcomeToastDefault: string;
  welcomeToastPlan: string;
};

export interface AuthNextMeta {
  path: string;
  label: string;
  hint: string;
  showRedirect: boolean;
  showPlanMerge: boolean;
  submitLogin: string;
  demoHint: string;
  welcomeToast: string;
}

/** Post-login redirect when opening login from site chrome */
export function loginNextFrom(pathname: string | null): string {
  if (!pathname || pathname === "/" || pathname === "/login") return "/profile";
  return pathname;
}

/** Safe in-app redirect target after auth */
export function normalizeAuthNext(raw: string | null): string {
  if (!raw || !raw.startsWith("/") || raw.startsWith("//")) return "/profile";
  const path = raw.split("?")[0].split("#")[0];
  if (!path) return "/profile";
  return path;
}

function destLabel(path: string, t: LoginDict): string {
  if (path === "/") return t.destHome;
  if (path === "/profile") return t.destProfile;
  if (path === "/plan") return t.destPlan;
  if (path === "/compare") return t.destCompare;
  if (path === "/tools") return t.destTools;
  if (path.startsWith("/destinations/")) return t.destDestination;
  if (path.startsWith("/dating")) return t.destDating;
  if (path.startsWith("/chat")) return t.destChat;
  if (path.startsWith("/meetups")) return t.destMeetups;
  if (path.startsWith("/join")) return t.destJoin;
  if (path.startsWith("/notifications")) return t.destNotifications;
  if (path.startsWith("/gigs")) return t.destGigs;
  if (path.startsWith("/community")) return t.destCommunity;
  if (path === "/submit") return t.destSubmit;
  return t.destProfile;
}

function hintFor(path: string, t: LoginDict): string {
  if (path === "/plan") return t.hintPlan;
  if (path === "/compare") return t.hintCompare;
  if (path === "/tools") return t.hintTools;
  if (path.startsWith("/destinations/")) return t.hintDestination;
  if (path === "/profile") return t.hintProfile;
  if (path.startsWith("/dating")) return t.hintDating;
  if (path.startsWith("/chat")) return t.hintChat;
  if (path.startsWith("/meetups")) return t.hintMeetups;
  if (path.startsWith("/join")) return t.hintJoin;
  if (path.startsWith("/notifications")) return t.hintNotifications;
  if (path.startsWith("/gigs")) return t.hintGigs;
  if (path.startsWith("/community")) return t.hintCommunity;
  if (path === "/submit") return t.hintSubmit;
  return t.hintExplore;
}

export function resolveAuthNext(raw: string | null, t: LoginDict): AuthNextMeta {
  const path = normalizeAuthNext(raw);
  const hasLocalPlan = loadTrip().length > 0;
  const isPlanFlow = path === "/plan" || path === "/compare";
  const label = destLabel(path, t);
  const hint = hintFor(path, t);
  const showPlanMerge = hasLocalPlan && (isPlanFlow || path === "/profile");
  const showRedirect = path !== "/profile" || showPlanMerge;

  return {
    path,
    label,
    hint,
    showRedirect,
    showPlanMerge,
    submitLogin: isPlanFlow ? t.submitLoginPlan : t.submitLoginDefault,
    demoHint: isPlanFlow ? t.demoHintPlan : t.demoHintDefault,
    welcomeToast: isPlanFlow ? t.welcomeToastPlan : t.welcomeToastDefault,
  };
}