/*
 * strings.ts — the Mini App shell's copy tokens.css (UI-SPEC §Copywriting Contract).
 * -------------------------------------------------------------------------------
 * Every user-facing string the shell renders lives here and NOWHERE else —
 * `web/src/ui/*` and `web/src/main.ts` import from this module, and the copy
 * gate (web/test/copy-gate.test.mjs COPY1..COPY5) keeps it verbatim against
 * the approved UI-SPEC table in en + ms. Register labels (`BOOT-01 //`,
 * `BOOT-02 //`, `GEO // LOCATION`, `SYS // POSITION`) are instrument
 * vocabulary: identical in both locales by design. Tone is clinical + honest
 * (D-01): plain statements of what is stored and what is not.
 *
 * Locales: English default ("en") + Bahasa Melayu ("ms") — Phase 2 D-05
 * precedent, same pickLocale ms-prefix rule as bot/src/i18n/strings.ts.
 */

export interface ShellStrings {
  bootValidatingRegister: string;
  bootValidatingHeadline: string;
  bootValidatingBody: string;
  bootAcquiringRegister: string;
  bootAcquiringHeadline: string;
  bootAcquiringBody: string;
  deniedRegister: string;
  ctaTryAgain: string;
  ctaAskViaChat: string;
  ctaLocationSettings: string;
  deniedHeadline: string;
  deniedBody: string;
  deniedHint: string;
  lostRegister: string;
  lostHeadline: string;
  lostBody: string;
  lostHint: string;
  chatFallbackWaiting: string;
  stripValidating: string;
  stripAcquiring: string;
  stripLive: string;
  stripSignalLost: string;
  stripLocationOff: string;
  stripAwaitingPin: string;
  attribution: string;
  ariaRecenter: string;
}

export type Locale = "en" | "ms";

export const strings: Record<Locale, ShellStrings> = {
  en: {
    bootValidatingRegister: "BOOT-01 // SESSION",
    bootValidatingHeadline: "Validating session",
    bootValidatingBody: "Confirming your Telegram identity. Takes a few seconds and stores nothing.",
    bootAcquiringRegister: "BOOT-02 // LOCATION",
    bootAcquiringHeadline: "Acquiring location",
    bootAcquiringBody: "Finding where you are. Your position is never written to storage.",
    deniedRegister: "GEO // LOCATION",
    ctaTryAgain: "TRY AGAIN",
    ctaAskViaChat: "ASK VIA CHAT",
    ctaLocationSettings: "LOCATION SETTINGS",
    deniedHeadline: "Location is switched off",
    deniedBody: "araharah guides you from where you physically are. Without location there is no route to draw.",
    deniedHint: "Grant location to Telegram, or send a pin in this chat: attach → Location.",
    lostRegister: "SYS // POSITION",
    lostHeadline: "Signal lost",
    lostBody: "Showing your last known position — marked on the map. Reacquiring automatically.",
    lostHint: "You can also send a fresh pin in this chat: attach → Location.",
    chatFallbackWaiting: "Waiting for the pin you send in chat.",
    stripValidating: "VALIDATING",
    stripAcquiring: "ACQUIRING",
    stripLive: "LIVE",
    stripSignalLost: "SIGNAL LOST",
    stripLocationOff: "LOCATION OFF",
    stripAwaitingPin: "AWAITING PIN",
    attribution: "© OpenStreetMap contributors",
    ariaRecenter: "Recenter map",
  },
  ms: {
    bootValidatingRegister: "BOOT-01 // SESSION",
    bootValidatingHeadline: "Menyemak sesi",
    bootValidatingBody: "Mengesahkan identiti Telegram anda. Hanya beberapa saat, tiada apa-apa disimpan.",
    bootAcquiringRegister: "BOOT-02 // LOCATION",
    bootAcquiringHeadline: "Mendapatkan lokasi",
    bootAcquiringBody: "Mencari kedudukan anda. Lokasi anda tidak pernah disimpan.",
    deniedRegister: "GEO // LOCATION",
    ctaTryAgain: "CUBA LAGI",
    ctaAskViaChat: "MINTA VIA CHAT",
    ctaLocationSettings: "TETAPAN LOKASI",
    deniedHeadline: "Lokasi dimatikan",
    deniedBody: "araharah memandu dari kedudukan sebenar anda. Tanpa lokasi, tiada laluan boleh dilukis.",
    deniedHint: "Benarkan lokasi untuk Telegram, atau hantar pin dalam chat ini: lampiran → Lokasi.",
    lostRegister: "SYS // POSITION",
    lostHeadline: "Isyarat hilang",
    lostBody: "Menunjukkan kedudukan terakhir anda — ditanda pada peta. Sedang mencari semula.",
    lostHint: "Anda juga boleh hantar pin baharu dalam chat ini: lampiran → Lokasi.",
    chatFallbackWaiting: "Menanti pin yang anda hantar dalam chat.",
    stripValidating: "MENYEMAK",
    stripAcquiring: "MENDAPAT",
    stripLive: "LANGSUNG",
    stripSignalLost: "ISYARAT HILANG",
    stripLocationOff: "LOKASI MATI",
    stripAwaitingPin: "AWAITING PIN",
    attribution: "© OpenStreetMap contributors",
    ariaRecenter: "Tetapkan semula peta",
  },
};

/**
 * D-05 fallback rule (verbatim from bot/src/i18n/strings.ts): a Telegram
 * `language_code` that starts with the Malay tag selects "ms"; every other
 * value (including null/undefined and unknown languages) falls back to en.
 */
export function pickLocale(telegramLanguageCode?: string | null): Locale {
  const code = telegramLanguageCode ?? "";
  return code === "ms" || code.startsWith("ms-") ? "ms" : "en";
}

/** Derive the locale from the RAW initData string (RESEARCH §Security V2 —
 *  the signed string, never initDataUnsafe). Telegram's wire format is
 *  user=<url-encoded JSON>&auth_date=...&query_id=...&signature=...&hash=...,
 *  so the first query component is `user`. A malformed or absent field
 *  falls back to "en" — never throws, never blocks boot. */
export function localeFromInitData(initData: string): Locale {
  try {
    const userField = initData.split("&")[0] ?? "";
    if (!userField.startsWith("user=")) return "en";
    const user = JSON.parse(decodeURIComponent(userField.slice(5))) as { language_code?: string };
    return pickLocale(user.language_code);
  } catch {
    return "en";
  }
}