#!/usr/bin/env node
/*
 * fullscreen.test.mjs — FS1..FS9, the PX-04 fullscreen gates (D-03).
 * -------------------------------------------------------------------------------
 * The Telegram-native requestFullscreen/exitFullscreen wiring behind the
 * Bot API 8.0 capability guard, driven with INJECTED FAKES (the
 * homescreen.test.mjs template: build the fake, call, assert — globals
 * stubbed per case and restored in a finally block, never leaked).
 *
 * Platform laws under test:
 *   - the capability guard is BOTH halves (method presence AND version)
 *   - a refused/throwing platform call is a supported degradation, never
 *     an error surface (T-07-06) — the guidance path continues
 *   - the old-client fallback (SC2.e): no fullscreen members → silent no-op,
 *     the client is still fully usable
 *   - fullscreenChanged / fullscreenFailed are observability, never
 *     correctness; a throwing observer cannot break the pump
 *   - the safe-area insets re-resolve on safeAreaChanged (PX-04.d)
 *   - NO DOM Fullscreen API, NO generic orientation lock anywhere
 *     (T-07-10, the FS9 source-scan ban)
 */
import { strict as assert } from "node:assert";
import { readFileSync } from "node:fs";
import path from "node:path";
import { fileURLToPath } from "node:url";
import { test } from "./harness.mjs";

const { requestGuidanceFullscreen, exitGuidanceFullscreen, watchFullscreenEvents } =
  await import("../src/telegram/fullscreen.ts");
const { watchSafeAreaChanges, applySafeArea, resolveSafeInsets } =
  await import("../src/telegram/safe-area.ts");

/** Fake TelegramWebAppLike with the 8.0+ fullscreen members (the
 * homescreen.test.mjs builder shape: segment-wise numeric version compare). */
function fakeWebApp(opts = {}) {
  const calls = {
    requestFullscreen: 0,
    exitFullscreen: 0,
    lockOrientation: 0,
    unlockOrientation: 0,
  };
  const events = new Map();
  const wa = {
    initData: "",
    version: opts.version ?? "10.0",
    isVersionAtLeast(v) {
      const a = wa.version.split(".").map(Number);
      const b = v.split(".").map(Number);
      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;
    },
    close() {},
    onEvent(event, cb) {
      const list = events.get(event) ?? [];
      list.push(cb);
      events.set(event, list);
    },
    emitEvent(event) {
      for (const cb of events.get(event) ?? []) cb();
    },
  };
  if (!opts.noRequestFullscreen) {
    wa.requestFullscreen = opts.throwRequestFullscreen
      ? () => {
          calls.requestFullscreen += 1;
          throw new Error("platform refused");
        }
      : () => {
          calls.requestFullscreen += 1;
        };
  }
  if (!opts.noExitFullscreen) {
    wa.exitFullscreen = () => {
      calls.exitFullscreen += 1;
    };
  }
  if (!opts.noLockOrientation) {
    wa.lockOrientation = () => {
      calls.lockOrientation += 1;
    };
  }
  if (!opts.noUnlockOrientation) {
    wa.unlockOrientation = () => {
      calls.unlockOrientation += 1;
    };
  }
  if (opts.safeAreaInset !== undefined) wa.safeAreaInset = opts.safeAreaInset;
  wa.__calls = calls;
  return wa;
}

/* ————— FS1..FS4 — the request path (BOTH-halves guard + refusal law) ————— */

test("FS1 a client without requestFullscreen is a silent no-op — nothing thrown, the method never queried", () => {
  const wa = fakeWebApp({ noRequestFullscreen: true });
  let result;
  assert.doesNotThrow(() => {
    result = requestGuidanceFullscreen(wa);
  });
  assert.equal(result, false, "method-absent half of the guard → false");
  assert.equal(wa.__calls.lockOrientation, 0, "no orientation lock without fullscreen");
});

test("FS2 an old client (7.9) with requestFullscreen PRESENT still gets false — the version guard ran BEFORE the call", () => {
  const wa = fakeWebApp({ version: "7.9" });
  const result = requestGuidanceFullscreen(wa);
  assert.equal(result, false, "version half of the guard → false");
  assert.equal(wa.__calls.requestFullscreen, 0, "the platform method was never invoked below Bot API 8.0");
});

test("FS3 a Bot API 8.0+ client gets fullscreen requested exactly once — and the CURRENT orientation locked", () => {
  const wa = fakeWebApp({ version: "8.0" });
  const result = requestGuidanceFullscreen(wa);
  assert.equal(result, true);
  assert.equal(wa.__calls.requestFullscreen, 1, "requested exactly once, never retried");
  assert.equal(wa.__calls.lockOrientation, 1, "Telegram's own orientation lock — CURRENT orientation only");
});

test("FS4 a THROWING requestFullscreen (the platform refuses) does not throw out of the wrapper — it returns false and guidance continues", () => {
  const wa = fakeWebApp({ throwRequestFullscreen: true });
  let result;
  assert.doesNotThrow(() => {
    result = requestGuidanceFullscreen(wa);
  }, "a refused request must not break the guidance start");
  assert.equal(result, false, "the refusal is reported as false, never thrown");
});

/* ————— FS5 — the exit mirror ————— */

test("FS5 exitGuidanceFullscreen mirrors the guard: absent method → false, old client → false, 8.0 → called exactly once", () => {
  const absent = fakeWebApp({ version: "10.0", noExitFullscreen: true });
  assert.equal(exitGuidanceFullscreen(absent), false);
  const old = fakeWebApp({ version: "7.9" });
  assert.equal(exitGuidanceFullscreen(old), false);
  assert.equal(old.__calls.exitFullscreen, 0, "never invoked below Bot API 8.0");
  const fresh = fakeWebApp({ version: "9.0" });
  assert.equal(exitGuidanceFullscreen(fresh), true);
  assert.equal(fresh.__calls.exitFullscreen, 1);
  assert.equal(fresh.__calls.unlockOrientation, 1, "the orientation lock is released with it");
});

/* ————— FS6 — the fullscreen events (observability, never correctness) ————— */

test("FS6 fullscreenChanged → onChange(true); fullscreenFailed → onChange(false); a THROWING observer cannot escape", () => {
  const wa = fakeWebApp({ version: "10.0" });
  const seen = [];
  watchFullscreenEvents(wa, (isFullscreen) => seen.push(isFullscreen));
  wa.emitEvent("fullscreenChanged");
  wa.emitEvent("fullscreenFailed");
  assert.deepEqual(seen, [true, false], "the category events map to the boolean");
  // a throwing client callback is contained — never breaks the pump
  let escaped = false;
  try {
    watchFullscreenEvents(wa, () => {
      throw new Error("observer exploded");
    });
    wa.emitEvent("fullscreenChanged");
    wa.emitEvent("fullscreenFailed");
  } catch {
    escaped = true;
  }
  assert.equal(escaped, false, "the handler wraps the callback in try/catch");
});

/* ————— FS7 — the OLD-CLIENT FALLBACK (SC2.e) ————— */

test("FS7 a version-7.0 client with NO fullscreen members: every call is a silent no-op, the client stays fully usable", () => {
  const wa = fakeWebApp({ version: "7.0", noRequestFullscreen: true, noExitFullscreen: true });
  let ok = true;
  try {
    assert.equal(requestGuidanceFullscreen(wa), false);
    assert.equal(exitGuidanceFullscreen(wa), false);
    watchFullscreenEvents(wa, () => {});
    wa.emitEvent("fullscreenChanged"); // unknown events fire nothing — no throw
  } catch {
    ok = false;
  }
  assert.equal(ok, true, "no error surface on the oldest supported clients");
  assert.equal(wa.__calls.requestFullscreen, 0);
  assert.equal(wa.__calls.exitFullscreen, 0);
});

/* ————— FS8 — the safe-area re-resolution (PX-04.d) ————— */

/** Minimal document stub exposing exactly the surface safe-area.ts touches:
 *  documentElement.style (the CSS-var record), body.appendChild (the env()
 *  probe host), createElement (the probe), getComputedStyle (reads 0). */
function installSafeAreaDocumentStub() {
  const recorded = new Map();
  const documentElementStyle = {
    setProperty(k, v) {
      recorded.set(k, v);
    },
    getPropertyValue(k) {
      return recorded.get(k) ?? "";
    },
  };
  const probe = {
    style: { cssText: "" },
    remove() {},
  };
  globalThis.document = {
    documentElement: { style: documentElementStyle },
    body: {
      appendChild() {},
    },
    createElement() {
      return probe;
    },
  };
  globalThis.getComputedStyle = () => ({
    getPropertyValue() {
      return "0px"; // env() resolves 0 in the stub — the union reads the Telegram half
    },
  });
  return documentElementStyle;
}

function restoreSafeAreaDocumentStub() {
  delete globalThis.document;
  delete globalThis.getComputedStyle;
}

test("FS8 a safeAreaChanged event re-applies the NEW insets — the cockpit re-resolves on rotation/fullscreen", () => {
  const style = installSafeAreaDocumentStub();
  try {
    // boot-time value: the client reports top=10
    const wa = fakeWebApp({ version: "10.0", safeAreaInset: { top: 10, bottom: 0, left: 0, right: 0 } });
    applySafeArea(resolveSafeInsets(wa));
    assert.equal(style.getPropertyValue("--safe-top"), "10px", "the first value lands at boot");
    watchSafeAreaChanges(wa);
    // the device rotates / enters fullscreen — the client now reports top=24
    wa.safeAreaInset = { top: 24, bottom: 4, left: 0, right: 0 };
    assert.doesNotThrow(() => wa.emitEvent("safeAreaChanged"));
    assert.equal(style.getPropertyValue("--safe-top"), "24px", "the inset re-resolved through the union authority");
    assert.equal(style.getPropertyValue("--safe-bottom"), "4px");
    // and the contentSafeAreaChanged event re-applies too
    wa.safeAreaInset = { top: 30, bottom: 0, left: 0, right: 0 };
    assert.doesNotThrow(() => wa.emitEvent("contentSafeAreaChanged"));
    assert.equal(style.getPropertyValue("--safe-top"), "30px", "both inset events re-resolve");
  } finally {
    restoreSafeAreaDocumentStub();
  }
});

/* ————— FS9 — the source-scan ban (T-07-10, the HS9 shape) ————— */

test("FS9 NO DOM-fullscreen / generic-orientation-lock escape hatches — the Telegram-native path is the only primary path", () => {
  const file = path.join(path.dirname(fileURLToPath(new URL(import.meta.url))), "..", "src", "telegram", "fullscreen.ts");
  const code = readFileSync(file, "utf8")
    .replace(/\/\*[\s\S]*?\*\//g, " ")
    .replace(/(^|[^:\\])\/\/[^\n]*/g, "$1");
  const banned = [
    "documentElement.requestFullscreen",
    "screen.orientation.lock",
    "webkitRequestFullscreen",
    "mozRequestFullScreen",
    "orientation.lock",
  ];
  for (const token of banned) {
    assert.ok(!code.includes(token), `fullscreen.ts code references ${token} — T-07-10 forbids the DOM escape hatches`);
  }
  assert.ok(!/document\s*\.\s*requestFullscreen\s*\(/.test(code), "requestFullscreen( may only be called on the Telegram WebApp, never on document");
  assert.ok(code.includes('isVersionAtLeast("8.0")'), "the 8.0 version half of the capability guard is NOT optional");
});