// The sign-in funnel: public auth config, email+password register/login/reset, email verification,
// session management, access requests, and the hidden demo login. Errors on the interactive paths
// are surfaced inline (quiet) rather than via the global modal. Only touches core's req.
import { req, uiLang } from "./core";

/** Why password sign-in refused. The three account-shaped reasons name the mailbox and both gates,
 * so the card can render an honest state instead of a red line; `invalid` and `rate_limited` answer
 * BEFORE the password is proven and therefore carry nothing (they must stay identical for a real
 * account and an unknown one). Since E9.5 S1 the gates are order-independent — read both flags, never
 * infer one from the other. */
export type LoginBlocked = {
  reason: "email_unverified" | "pending_approval" | "suspended" | "invalid" | "rate_limited";
  /** The address ON THE ACCOUNT — not the spelling that was typed. Absent for the two pre-proof
   * reasons. Naming it is what would have exposed the 2026-09-03 Gmail-alias mismatch in a second. */
  email?: string;
  emailVerified?: boolean;
  approved?: boolean;
  /** Operator contact, when the instance publishes one (suspended accounts only). */
  operator?: string;
};

/** Did a password-reset call fail because the LINK itself is finished — spent, expired, or belonging
 * to an account that no longer exists — rather than because the new password was too short? The two
 * arrive as the same 400, and only the first one means the form should come down. */
export function deadResetLink(detail: unknown): boolean {
  const d = detail as { code?: string; reason?: string } | null | undefined;
  return d?.code === "reset" && d.reason === "invalid";
}

const LOGIN_REASONS = new Set<LoginBlocked["reason"]>([
  "email_unverified",
  "pending_approval",
  "suspended",
  "invalid",
  "rate_limited",
]);

/** Read a `{code:"login", …}` error detail into LoginBlocked, or null for anything else — including
 * a reason a NEWER server invented, which the card must fall back to a plain message for rather than
 * render as a blank panel. */
export function loginBlocked(detail: unknown): LoginBlocked | null {
  const d = detail as Record<string, unknown> | null | undefined;
  if (!d || d.code !== "login") return null;
  const reason = d.reason as LoginBlocked["reason"];
  if (!LOGIN_REASONS.has(reason)) return null;
  return {
    reason,
    email: typeof d.email === "string" ? d.email : undefined,
    emailVerified: typeof d.email_verified === "boolean" ? d.email_verified : undefined,
    approved: typeof d.approved === "boolean" ? d.approved : undefined,
    operator: typeof d.operator === "string" ? d.operator : undefined,
  };
}

export const authApi = {
  // Public: which sign-in options this instance offers (e.g. hide Google when not configured).
  authConfig: (): Promise<{
    google_enabled: boolean;
    allow_registration: boolean;
    operator_contact: string | null;
  }> => req("/auth/config"),

  // --- email + password (errors handled inline via quiet) ---
  // `lang` is stamped here rather than passed in: this is the ONE moment the sign-up language
  // exists anywhere the server can see it (the account does not exist yet to carry it), and every
  // mail this person ever gets is written from what lands here.
  register: (email: string, password: string): Promise<{ status: string }> =>
    req(
      "/auth/register",
      { method: "POST", body: JSON.stringify({ email, password, lang: uiLang() }) },
      { quiet: true },
    ),
  // A refusal carries a structured `{code:"login", reason, …}` detail — see LoginBlocked above.
  passwordLogin: (email: string, password: string): Promise<{ ok: boolean }> =>
    req(
      "/auth/password-login",
      { method: "POST", body: JSON.stringify({ email, password }) },
      { quiet: true },
    ),
  requestPasswordReset: (email: string): Promise<{ status: string }> =>
    req(
      "/auth/password-reset/request",
      { method: "POST", body: JSON.stringify({ email }) },
      { quiet: true },
    ),
  // Is a `#reset=` token still usable? Answers WITHOUT spending it, so the card can refuse to draw a
  // form that cannot succeed (a deleted account, an expired or already-used link). Advisory only —
  // confirmPasswordReset stays the authority, since the token can die between the two calls.
  checkPasswordReset: (token: string): Promise<{ ok: boolean }> =>
    req(
      "/auth/password-reset/check",
      { method: "POST", body: JSON.stringify({ token }) },
      { quiet: true },
    ),
  confirmPasswordReset: (token: string, password: string): Promise<{ ok: boolean }> =>
    req(
      "/auth/password-reset/confirm",
      { method: "POST", body: JSON.stringify({ token, password }) },
      { quiet: true },
    ),
  // Confirm an email-verification token the SPA read from the URL fragment (SB3).
  // `password_reset_required` = SEC-10 dropped the password this account registered with, so signing
  // in would fail with the uniform credentials error. The card sends the user to the reset flow instead
  // of leaving them to guess. Rare since E9.5 S1: only accounts stripped before that change, and the
  // Google-adoption path, still reach it.
  // `email` is the address that was just confirmed — echoed back so the banner can name it, which
  // matters when the browser holds a session for a DIFFERENT account.
  verifyEmail: (
    token: string,
  ): Promise<{ ok: boolean; password_reset_required?: boolean; email?: string }> =>
    req("/auth/verify", { method: "POST", body: JSON.stringify({ token }) }, { quiet: true }),
  // Re-issue a verification link (the first one expired, or was lost). Uniform response — never
  // reveals whether the email has a pending account.
  resendVerification: (email: string): Promise<{ status: string }> =>
    req(
      "/auth/verify/resend",
      { method: "POST", body: JSON.stringify({ email }) },
      { quiet: true },
    ),
  // SA4: sign every OTHER session for this account out (keeps the current one).
  logoutOthers: (): Promise<{ ok: boolean }> => req("/auth/logout-others", { method: "POST" }),
  // Set or change the signed-in account's password (errors shown inline via quiet).
  setPassword: (password: string, currentPassword?: string): Promise<{ ok: boolean }> =>
    req(
      "/auth/set-password",
      { method: "POST", body: JSON.stringify({ password, current_password: currentPassword }) },
      { quiet: true },
    ),

  // --- onboarding: access requests + demo entry ---
  // Same reasoning as register: the requester has no account to carry a language preference, so the
  // page they asked from is what decides the language of the approval or denial mail.
  requestAccess: (email: string): Promise<{ status: string }> =>
    req("/auth/request-access", {
      method: "POST",
      body: JSON.stringify({ email, lang: uiLang() }),
    }),
  // Hidden demo entry: a whitelisted email logs into the shared demo account, no Google
  // sign-in. Returns whether a session was established.
  demoLogin: (email: string): Promise<{ authenticated: boolean }> =>
    req("/auth/demo", { method: "POST", body: JSON.stringify({ email }) }),
};