/*
 * telegram-mock.ts — the D-11 Mock-Telegram harness.
 * -------------------------------------------------
 * Injects a fake `window.Telegram.WebApp` into the SAME window the app
 * runs in — never an iframe. Bot API 10.2 (enforced 2026-07-20) rejects
 * Mini App method calls from any origin other than the registered Mini
 * App domain, so an iframe harness would silently fail (RESEARCH
 * Pitfall 6).
 *
 * Dev-signed initData uses the SAME HMAC path as bot/src/security/initdata.ts
 * (`HMAC(bot_token, "WebAppData")`) so `POST /api/session` accepts it
 * unmodified against `bot/.dev.vars`. Changes nothing when the token
 * is real, and never logs it.
 *
 * Signing runs on the Web Crypto API (crypto.subtle.importKey + sign,
 * HMAC-SHA-256, TextEncoder) — the only crypto available in a browser
 * — so `makeDevInitData` is async. The test suites use their own
 * test-side signer instead.
 *
 * This module ships nothing to production: `no-storage.test.mjs` and
 * the build-artifact gate both assert it is excluded from `web/dist`.
 *
 * Phase 4 (04-04): the mock satisfies the contract's three new OPTIONAL
 * members in the SAME change that introduces them — `startParam` (appended
 * to the fake initData as `&start_param=<encoded>`, the direct-link carrier
 * the ONBD-02 harness leg exercises), `homeScreenStatus` (what the mock's
 * checkHomeScreenStatus callback delivers; default "unknown", the iOS
 * reality), and the addToHomeScreen stub whose `__homeScreenAdded` counter
 * tests read (the `__events` / `__backButtonClicks` exposure precedent).
 * The mock's initData is HMAC-unvalidated by design — the runner page
 * stubs `/api/session`.
 *
 * The ?drive= replay knob (06-08, D-16's browser leg): `?drive=<name>` makes
 * THIS mock replace navigator.geolocation with a replay source that streams
 * a committed drive fixture (web/test/fixtures/drives/*.json — the same JSON
 * the Node replays prove the brain with) through the LIVE shell — the real
 * pump, real builders, real camera consume the fixes via the real
 * createGuidanceWatch. The replay clock starts lazily at the FIRST
 * watchPosition arm (the route draw — the pump's ensureWatch), so no fix is
 * ever emitted before something consumes it, and plays REAL-TIME: the
 * machine's grace/storm clocks read wall time (route.ts's now()), so a
 * compressed playback would desync them. window.__ARAHARAH_DRIVE.pause()/
 * resume() freeze/resume emission mid-stream — the capture script's freeze
 * for stable scripted taps (confirm/tripend legs) and the REROUTING leg's
 * window. A pause stops EMISSION only; the shell's wall clock keeps running
 * (grace windows inflate across a pause — legs that pause close before any
 * machine timing matters). Console emits NOTHING per fix; an unknown drive
 * name is the knob's one honest token (`ARAHARAH-DRIVE state=unknown`) and
 * falls back to the default geolocation — never a crash, never replayed
 * arbitrary data (the fixture/kernel mismatch mitigation, T-06-08).
 */
import type { TelegramWebAppLike, HomeScreenStatus } from "../telegram/webapp.ts";

export interface MockOptions {
  platform?: "android" | "ios" | "tdesktop" | "macos" | "windows" | "linux" | "web";
  version?: string;
  colorScheme?: "light" | "dark";
  /** Telegram language_code carried in the fake initData's user JSON —
   *  lets main.ts's localeFromInitData exercise its real parsing path
   *  and lets the runner page switch locales via ?locale=. */
  languageCode?: string;
  /** Artificial delivery delay (ms) for LocationManager.init()/getLocation()
   *  callbacks — the runner page's ?fixdelay= knob. At localhost speeds the
   *  whole three-source chain resolves in a few ms, so the staged boot cards
   *  (BOOT-01 validating / BOOT-02 acquiring) cannot otherwise be photographed;
   *  a delayed fix delivery holds the earlier stage on screen (03-04 capture
   *  harness only — defaults to 0, the fallback dev install is unchanged). */
  deliveryDelayMs?: number;
  telegramFix?: { lat: number; lng: number; accuracyM?: number | null; headingDeg?: number | null } | null;
  webviewFix?: { lat: number; lng: number; accuracyM?: number } | null;
  grantLocation?: boolean;
  /** The direct-link start parameter (04-04): appended to the mock initData
   *  as `&start_param=<encoded>` — the SECONDARY destination carrier's
   *  harness leg. The URL query carrier needs no mock: page.goto preserves
   *  `?dest=` in window.location.search. */
  startParam?: string | null;
  /** What the mock's checkHomeScreenStatus callback delivers (04-04).
   *  Defaults to "unknown" — the documented iOS reality, treated by the
   *  app as "supported but indeterminate", never an error. */
  homeScreenStatus?: HomeScreenStatus;
}

interface MockLocationManager {
  isInited: boolean;
  isLocationAvailable: boolean;
  isAccessRequested: boolean;
  isAccessGranted: boolean;
  init(cb: () => void): void;
  getLocation(cb: (data: unknown | null) => void): void;
}

interface MockWebApp extends TelegramWebAppLike {
  __events: Map<string, Array<() => void>>;
  __backButtonClicks: Array<() => void>;
  __homeScreenAdded: number;
  __fullscreenRequested: number;
  __fullscreenExited: number;
  __orientationLocked: number;
  __orientationUnlocked: number;
  __isFullscreen: boolean;
}

/* ————— Web-Crypto dev signer (mirror of bot/src/security/initdata.ts's HMAC path) ————— */

function utf8Bytes(value: string): Uint8Array {
  return new TextEncoder().encode(value);
}

async function hmacBytes(message: Uint8Array, key: Uint8Array): Promise<Uint8Array> {
  const cryptoKey = await crypto.subtle.importKey(
    "raw",
    key as unknown as ArrayBuffer,
    { name: "HMAC", hash: "SHA-256" },
    false,
    ["sign"],
  );
  const sig = await crypto.subtle.sign("HMAC", cryptoKey, message as unknown as ArrayBuffer);
  return new Uint8Array(sig);
}

function bytesToHex(bytes: Uint8Array): string {
  return [...bytes].map((b) => b.toString(16).padStart(2, "0")).join("");
}

/** dataCheckString = fields minus hash/signature, sorted by key, `key=value`, joined with "\n". */
function dataCheckString(fields: Array<[string, string]>): string {
  return fields
    .filter(([key]) => key !== "hash" && key !== "signature")
    .slice()
    .sort((a, b) => (a[0] < b[0] ? -1 : a[0] > b[0] ? 1 : 0))
    .map(([key, value]) => `${key}=${value}`)
    .join("\n");
}

/** `POST /api/session` computes the same two-step HMAC: key = HMAC(botToken, salt). */
export async function makeDevInitData(
  botToken: string,
  user: { id: number; first_name?: string; language_code?: string },
): Promise<string> {
  const fields: Array<[string, string]> = [
    ["user", JSON.stringify(user)],
    ["auth_date", String(Math.floor(Date.now() / 1000))],
  ];
  const dcs = dataCheckString(fields);
  // Step 1: secret key = HMAC(message = botToken bytes, key = the platform salt constant).
  const secretKey = await hmacBytes(utf8Bytes(botToken), utf8Bytes("WebAppData"));
  // Step 2: hash = HMAC(message = dataCheckString bytes, key = that secret key).
  const hash = bytesToHex(await hmacBytes(utf8Bytes(dcs), secretKey));
  const wire = fields.map(([key, value]) => `${key}=${encodeURIComponent(value)}`).join("&");
  return `${wire}&hash=${hash}`;
}

/* ————— install / uninstall ————— */

/** Dotted-numeric Bot API version compare: "8.0" >= "8.0", "9.1" >= "8.0". */
function versionAtLeast(have: string, want: string): boolean {
  const a = have.split(".").map((n) => Number.parseInt(n, 10) || 0);
  const b = want.split(".").map((n) => Number.parseInt(n, 10) || 0);
  for (let i = 0; i < Math.max(a.length, b.length); i++) {
    const av = a[i] ?? 0;
    const bv = b[i] ?? 0;
    if (av > bv) return true;
    if (av < bv) return false;
  }
  return true;
}

let installed: MockWebApp | null = null;

/**
 * Harness initData: a non-empty, correctly-SHAPED Telegram wire string
 * (`user=<url-encoded JSON>&auth_date=1&query_id=h&hash=harness`). The
 * capture runner stubs POST /api/session OUTSIDE any dead-code strip, so
 * this never reaches an HMAC validator — it exists so main.ts's
 * localeFromInitData parses the real wire format instead of falling
 * back to "en" (locale = options.languageCode, defaulting to "en").
 * Untouched when no languageCode is given (the plain-dev fallback mock
 * keeps initData "" exactly as before) — unless a startParam arrives
 * (04-04), in which case the wire carries it as `&start_param=<encoded>`
 * so the SECONDARY destination carrier is exercisable end-to-end.
 */
function buildMockInitData(languageCode?: string, startParam?: string | null): string {
  if (languageCode === undefined && !startParam) return "";
  const user = JSON.stringify({ language_code: languageCode ?? "en", id: 1, first_name: "Harness" });
  const base = `user=${encodeURIComponent(user)}&auth_date=1&query_id=h&hash=harness`;
  return startParam ? `${base}&start_param=${encodeURIComponent(startParam)}` : base;
}

/* ————— the ?drive= fixture-replay source (06-08, D-16's browser leg) ————— */

/** A committed drive fixture's structural minimum (the 06-02 replay shape:
 *  { _notice, pairId, maneuverIdx, kinds, fixes[] } with Fix-shaped fixes). */
interface DriveFixture {
  fixes: Array<{ lat: number; lng: number; accuracyM?: number | null; headingDeg?: number | null; ts: number; source?: string }>;
}

/** The pause/resume surface the capture script drives (window.__ARAHARAH_DRIVE). */
export interface DriveReplayControls {
  /** Freeze the replay clock mid-stream — emission stops until resume(). */
  pause(): void;
  /** Continue mid-stream: unpaused wall time resumes driving the schedule. */
  resume(): void;
  readonly name: string;
}

declare global {
  interface Window {
    /** Installed ONLY when ?drive= names a committed fixture — the capture
     *  script's freeze surface (and its diagnostics: .name). */
    __ARAHARAH_DRIVE?: DriveReplayControls;
  }
}

/** Drive names are slugs (the pairId/destinationId pattern — bounds the
 *  lookup against hostile query strings before the fixture record is read). */
const DRIVE_NAME_PATTERN = /^[a-z0-9-]{1,64}$/;

/** The committed D-16 drive replays, inlined into the HARNESS bundle at build
 *  time (eager glob, the route-profiles BA-exclusion posture: this module is
 *  imported by main.ts's dead harness branch and tree-shaken from production —
 *  BA5 asserts the absence). The pattern is ROOT-ABSOLUTE (/test/... — Vite 8's
 *  importGlob matches no relative pattern that escapes src/; verified by the
 *  06-08 dev-server probe). */
const DRIVE_FIXTURES = import.meta.glob<unknown>("/test/fixtures/drives/*.json", {
  eager: true,
  import: "default",
});

/** Defensive shape check (the fixture-source isUsablePair posture): a
 *  malformed drive degrades to the honest unknown-fallback, never a crash
 *  and never a partial replay (T-06-08's Tampering mitigation). */
function isDriveFixture(value: unknown): value is DriveFixture {
  if (value === null || typeof value !== "object") return false;
  const fixes = (value as { fixes?: unknown }).fixes;
  if (!Array.isArray(fixes) || fixes.length < 2) return false;
  return fixes.every((f) => {
    if (f === null || typeof f !== "object") return false;
    const p = f as { lat?: unknown; lng?: unknown; ts?: unknown };
    return (
      typeof p.lat === "number" &&
      Number.isFinite(p.lat) &&
      typeof p.lng === "number" &&
      Number.isFinite(p.lng) &&
      typeof p.ts === "number" &&
      Number.isFinite(p.ts)
    );
  });
}

function driveFixtureByName(name: string): DriveFixture | null {
  if (!DRIVE_NAME_PATTERN.test(name)) return null;
  const hit = DRIVE_FIXTURES[`/test/fixtures/drives/${name}.json`];
  return isDriveFixture(hit) ? hit : null;
}

/** Position assembled from a fixture fix at a replayed wall timestamp. The
 *  watch (createGuidanceWatch) normalizes exactly the four consumed fields;
 *  the GeolocationPosition type's remaining members are cast — the harness
 *  source is the fixture itself, not a lying platform. */
function replayedPosition(f: DriveFixture["fixes"][number], timestamp: number): GeolocationPosition {
  return {
    coords: {
      latitude: f.lat,
      longitude: f.lng,
      accuracy: f.accuracyM ?? undefined,
      altitude: null,
      altitudeAccuracy: null,
      altitudeAngle: null,
      heading: f.headingDeg ?? undefined,
      speed: null,
    },
    timestamp,
  } as unknown as GeolocationPosition;
}

/**
 * Replace navigator.geolocation with the drive replay (harness-only): the
 * REAL pump arms its REAL watch against this object, so the shell consumes
 * the committed stream through the unmodified D-15 throttle — replay proves
 * the shell, never bypassing it (the trust boundary's law).
 *
 * Clock semantics: the schedule is real-time (offset = fix.ts − fixes[0].ts;
 * a 200ms tick delivers every fix whose offset has elapsed). pos.timestamp
 * is t0 + offset so the machine's now()-anchored windows stay aligned with
 * the fixes that drive them. Exhaustion stops the timer; a later re-arm
 * delivers nothing (the drive is over).
 */
function installDriveReplay(name: string, fixture: DriveFixture): DriveReplayControls {
  const fixes = fixture.fixes;
  const first = fixes[0]!;
  const offsets = fixes.map((f) => Math.max(0, f.ts - first.ts));
  let clockStart: number | null = null; // performance.now() at the first watch arm
  let wallT0 = 0; // Date.now() at the same instant — pos.timestamp = wallT0 + offset
  let pausedAt: number | null = null;
  let pausedTotal = 0;
  let delivered = 0;
  let nextId = 0;
  let timer: ReturnType<typeof setInterval> | null = null;
  const sinks = new Map<number, (pos: GeolocationPosition) => void>();

  const elapsedMs = (): number => {
    if (clockStart === null) return -1;
    const nowP = performance.now();
    return (nowP - clockStart) - pausedTotal - (pausedAt !== null ? nowP - pausedAt : 0);
  };
  const stopTimer = (): void => {
    if (timer !== null) {
      clearInterval(timer);
      timer = null;
    }
  };
  const tick = (): void => {
    const e = elapsedMs();
    if (e < 0) return;
    while (delivered < fixes.length) {
      const offset = offsets[delivered]!;
      if (offset > e) break;
      const fix = fixes[delivered]!;
      const pos = replayedPosition(fix, wallT0 + offset);
      for (const sink of sinks.values()) sink(pos);
      delivered += 1;
    }
    if (delivered >= fixes.length) stopTimer(); // fully replayed — the drive is over
  };
  const ensureTimer = (): void => {
    if (timer === null && delivered < fixes.length) timer = setInterval(tick, 200);
  };

  const fakeGeo = {
    getCurrentPosition(success: PositionCallback, _error?: PositionErrorCallback | null, _opts?: PositionOptions): void {
      // the chain's LINK-2 shape (unused while the Telegram mock serves LINK 1):
      // the drive's FIRST fix, at wall-now, like a real one-shot read
      const f = first;
      setTimeout(() => success(replayedPosition(f, Date.now())), 0);
    },
    watchPosition(success: PositionCallback, _error?: PositionErrorCallback | null, _opts?: PositionOptions): number {
      const id = ++nextId;
      sinks.set(id, success);
      if (clockStart === null) {
        clockStart = performance.now();
        wallT0 = Date.now();
      }
      ensureTimer(); // the first arm starts the clock; re-arms resume delivery
      return id;
    },
    clearWatch(id: number): void {
      sinks.delete(id);
      if (sinks.size === 0) stopTimer(); // the pump stopped the watch — the replay stops with it
    },
  };
  Object.defineProperty(navigator, "geolocation", { value: fakeGeo, configurable: true });

  const controls: DriveReplayControls = {
    get name(): string {
      return name;
    },
    pause(): void {
      if (pausedAt === null) pausedAt = performance.now();
    },
    resume(): void {
      if (pausedAt !== null) {
        pausedTotal += performance.now() - pausedAt;
        pausedAt = null;
      }
      ensureTimer();
    },
  };
  window.__ARAHARAH_DRIVE = controls;
  return controls;
}

export function installMockWebApp(options: MockOptions = {}): TelegramWebAppLike {
  const version = options.version ?? "8.0";
  const telegramFix = options.telegramFix ?? null;
  const delayMs = options.deliveryDelayMs ?? 0;
  const lm: MockLocationManager = {
    isInited: false,
    isLocationAvailable: options.grantLocation !== false,
    isAccessRequested: options.grantLocation !== false,
    isAccessGranted: options.grantLocation !== false,
    init(cb: () => void) {
      setTimeout(() => {
        lm.isInited = true;
        cb();
      }, delayMs);
    },
    getLocation(cb: (data: unknown | null) => void) {
      // grantLocation true → delivers the configured fix on a macrotask so the
      // callback is asynchronous (a wedged client is cb(null) or silence).
      // The DELIVERY SHAPE is the Telegram LocationManager wire format —
      // { latitude, longitude, horizontal_accuracy, course } — because the
      // consumer is requestTelegramFix, which maps exactly those keys. The
      // MockOptions.telegramFix keys (lat/lng/accuracyM/headingDeg) are the
      // authoring shape; delivering them verbatim maps to undefined → a NaN
      // LngLat pageerror in marker.update (found by the 03-04 capture harness,
      // the first end-to-end consumer of this callback).
      if (options.grantLocation !== false && telegramFix !== null) {
        setTimeout(() => cb({
          latitude: telegramFix.lat,
          longitude: telegramFix.lng,
          horizontal_accuracy: telegramFix.accuracyM ?? undefined,
          course: telegramFix.headingDeg ?? undefined,
        }), delayMs);
      } else {
        setTimeout(() => cb(null), 0); // the denial signal — synchronous null would hide async bugs
      }
    },
  };
  const events = new Map<string, Array<() => void>>();
  const backButtonClicks: Array<() => void> = [];
  let homeScreenAddedCount = 0;
  const homeScreenStatus: HomeScreenStatus = options.homeScreenStatus ?? "unknown";
  const fake: MockWebApp = {
    initData: buildMockInitData(options.languageCode, options.startParam),
    startParam: options.startParam ?? undefined,
    colorScheme: options.colorScheme ?? "light",
    themeParams: {},
    version,
    platform: options.platform ?? "android",
    __events: events,
    __backButtonClicks: backButtonClicks,
    __homeScreenAdded: 0,
    __fullscreenRequested: 0,
    __fullscreenExited: 0,
    __orientationLocked: 0,
    __orientationUnlocked: 0,
    __isFullscreen: false,
    isVersionAtLeast(v: string) {
      return versionAtLeast(version, v);
    },
    close() {
      /* the runner page listens to window-event hooks; nothing to close here */
    },
    addToHomeScreen() {
      homeScreenAddedCount += 1;
      fake.__homeScreenAdded = homeScreenAddedCount;
    },
    checkHomeScreenStatus(cb: (status: HomeScreenStatus) => void) {
      setTimeout(() => cb(homeScreenStatus), 0);
    },
    // PX-04/D-03 (07-01): the fullscreen members ship with the contract —
    // the mock satisfies the grown contract in the SAME change ("contract +
    // fake + test together"). The ?mock= profile's `version` below 8.0 makes
    // the fullscreen path a silent no-op via the version guard — never
    // hard-coded, the mock's own versionAtLeast drives the guard.
    requestFullscreen() {
      fake.__fullscreenRequested = (fake.__fullscreenRequested ?? 0) + 1;
      fake.__isFullscreen = true;
    },
    exitFullscreen() {
      fake.__fullscreenExited = (fake.__fullscreenExited ?? 0) + 1;
      fake.__isFullscreen = false;
    },
    lockOrientation() {
      fake.__orientationLocked = (fake.__orientationLocked ?? 0) + 1;
    },
    unlockOrientation() {
      fake.__orientationUnlocked = (fake.__orientationUnlocked ?? 0) + 1;
    },
    onEvent(event: string, cb: () => void) {
      const list = events.get(event) ?? [];
      list.push(cb);
      events.set(event, list);
    },
    offEvent(event: string, cb: () => void) {
      events.set(event, (events.get(event) ?? []).filter((f) => f !== cb));
    },
    BackButton: {
      show() {},
      hide() {},
      onClick(cb: () => void) {
        backButtonClicks.push(cb);
      },
      offClick(cb: () => void) {
        const i = backButtonClicks.indexOf(cb);
        if (i >= 0) backButtonClicks.splice(i, 1);
      },
    },
    LocationManager: lm,
  };
  installed = fake;
  const w = window as unknown as { Telegram?: unknown };
  w.Telegram = { WebApp: fake };
  // The ?drive= replay knob (06-08): read from location.search HERE — the
  // mock module is the harness surface, so the knob rides every install path
  // (the runner page's profile install AND main.ts's plain-dev fallback)
  // without a new carrier. Unknown name → one honest token + the default
  // geolocation stays; never a crash, never replayed arbitrary data.
  let driveName: string | null = null;
  try {
    driveName = new URLSearchParams(window.location?.search ?? "").get("drive");
  } catch {
    driveName = null;
  }
  if (driveName !== null) {
    const fixture = driveFixtureByName(driveName);
    if (fixture === null) console.log("ARAHARAH-DRIVE state=unknown");
    else installDriveReplay(driveName, fixture);
  }
  return fake;
}

export function uninstallMockWebApp(): void {
  installed = null;
  const w = window as unknown as { Telegram?: unknown };
  delete w.Telegram;
}

/** Fire the registered themeChanged listeners — theme.test.mjs PX-02 case 4. */
export function emitThemeChanged(): void {
  const fake = installed;
  if (!fake) throw new Error("installMockWebApp must run before emitThemeChanged");
  for (const cb of fake.__events.get("themeChanged") ?? []) cb();
}