import { test } from "node:test";
import assert from "node:assert/strict";
import { build } from "esbuild";
const compiled = await build({
  entryPoints: ["client/src/lib/aiFir.ts"],
  bundle: true,
  write: false,
  format: "esm",
  platform: "node",
});
const fir = await import(
  "data:text/javascript;base64," +
    Buffer.from(compiled.outputFiles[0].text).toString("base64")
);
function pair(n = 8192) {
  const left = Array(n).fill(0),
    right = Array(n).fill(0);
  left[10] = 0.4;
  right[12] = 0.2;
  left[200] = 0.1;
  right[202] = 0.05;
  left[0] = -0;
  return { left, right };
}
function adjustment(extra = {}) {
  return {
    snapshot_id: "snapshot",
    name: "test",
    explanation: "Less late energy",
    gain_db: 0,
    tail_gain_db: 0,
    smoothing: 0,
    ...extra,
  };
}
function storage() {
  const data = new Map();
  return {
    setItem: (k, v) => data.set(k, v),
    getItem: k => data.get(k) ?? null,
  };
}
function proposal() {
  const before = pair();
  return {
    id: "p",
    device: "device1",
    before,
    after: fir.renderFir(before, adjustment({ tail_gain_db: -6 })),
    adjustment: adjustment({ tail_gain_db: -6 }),
    created: "now",
  };
}
function binary(values) {
  const b = new ArrayBuffer(values.length * 4),
    v = new DataView(b);
  values.forEach((x, i) => v.setFloat32(i * 4, x, true));
  return b;
}
function mockDevice(p) {
  const current = {
    left: binary(p.before.left),
    right: binary(p.before.right),
  };
  const posts = [];
  return {
    posts,
    current,
    getFirChannel: async side => current[side].slice(0),
    uploadFirChannel: async (side, data) => {
      posts.push(side);
      current[side] = data.slice(0);
    },
  };
}
test("decode validates raw float32 lengths/nonfinite and mismatched ear counts", () => {
  assert.throws(() => fir.decodeFir(new ArrayBuffer(4)));
  const b = binary(pair().left);
  new DataView(b).setFloat32(0, NaN, true);
  assert.throws(() => fir.decodeFir(b));
  assert.throws(() =>
    fir.validatePair({ left: pair().left, right: pair(8191).right })
  );
});
test("identity, common attenuation and common envelope keep taps and stereo timing", () => {
  for (const n of [8191, 8192]) {
    const p = pair(n),
      a = fir.renderFir(p, adjustment());
    assert.equal(a.left.length, n);
    assert.equal(a.right.length, n);
    assert.equal(a.left[10], Math.fround(p.left[10]));
    assert.equal(a.right[12], Math.fround(p.right[12]));
    const q = fir.renderFir(p, adjustment({ gain_db: -6, tail_gain_db: -12 }));
    assert.ok(q.left[200] < q.left[10] / 4);
    assert.equal(q.left.indexOf(Math.max(...q.left)), 10);
    assert.equal(q.right.indexOf(Math.max(...q.right)), 12);
    assert.ok(q.left.every((x, i) => Math.abs(x) <= Math.abs(p.left[i])));
  }
});
test("bounded transforms reject gain boosts, NaN and out-of-range smoothing", () => {
  for (const a of [
    { gain_db: 1 },
    { gain_db: NaN },
    { tail_gain_db: -25 },
    { smoothing: 2 },
  ])
    assert.throws(() => fir.renderFir(pair(), adjustment(a)));
});
test("smoothing uses documented causal 3 tap kernel", () => {
  const p = pair();
  const q = fir.renderFir(p, adjustment({ smoothing: 1 }));
  assert.equal(q.left[10], Math.fround(0.1));
  assert.equal(q.left[11], Math.fround(0.2));
  assert.equal(q.left[12], Math.fround(0.1));
});
test("cache preserves exact float32 bytes including signed zero, isolated by device", () => {
  const p = proposal(),
    s = storage();
  fir.saveFirBackup(s, { version: 1, proposal: p, state: "pending" });
  const loaded = fir.loadFirBackup(s, p.device);
  assert.ok(Object.is(loaded.proposal.before.left[0], -0));
  assert.deepEqual(binary(loaded.proposal.before.left), binary(p.before.left));
  assert.equal(fir.loadFirBackup(s, "different"), null);
});
test("backup failure or changed device blocks ALL POSTs", async () => {
  const p = proposal(),
    d = mockDevice(p);
  await assert.rejects(
    fir.applyFirVersion(
      d,
      {
        setItem() {
          throw Error("quota");
        },
        getItem() {
          return null;
        },
      },
      { version: 1, proposal: p, state: "pending" },
      "B",
      true
    )
  );
  assert.deepEqual(d.posts, []);
  new DataView(d.current.left).setFloat32(100, 1, true);
  await assert.rejects(
    fir.applyFirVersion(
      d,
      storage(),
      { version: 1, proposal: p, state: "pending" },
      "B",
      true
    ),
    /FIR_CHANGED/
  );
  assert.deepEqual(d.posts, []);
});
test("backup precedes left/right upload; verified A/B restores byte-exact original without switch writes", async () => {
  const p = proposal(),
    s = storage(),
    d = mockDevice(p);
  const send = d.uploadFirChannel;
  d.uploadFirChannel = async (side, data) => {
    assert.ok(fir.loadFirBackup(s, p.device));
    await send(side, data);
  };
  const done = await fir.applyFirVersion(
    d,
    s,
    { version: 1, proposal: p, state: "pending" },
    "B",
    true
  );
  assert.equal(done.state, "B");
  assert.deepEqual(d.posts, ["left", "right"]);
  const restored = await fir.applyFirVersion(d, s, done, "A");
  assert.equal(restored.state, "A");
  assert.deepEqual(d.current.left, binary(p.before.left));
  assert.deepEqual(d.current.right, binary(p.before.right));
});
test("right-ear failure retains original backup and marks incomplete, no automatic retries", async () => {
  const p = proposal(),
    s = storage(),
    d = mockDevice(p),
    send = d.uploadFirChannel;
  d.uploadFirChannel = async (side, data) => {
    if (side === "right") throw Error("502");
    await send(side, data);
  };
  await assert.rejects(
    fir.applyFirVersion(
      d,
      s,
      { version: 1, proposal: p, state: "pending" },
      "B",
      true
    )
  );
  const cached = fir.loadFirBackup(s, p.device);
  assert.equal(cached.state, "incomplete");
  assert.deepEqual(binary(cached.proposal.before.left), binary(p.before.left));
  assert.deepEqual(d.posts, ["left"]);
});
test("readback mismatch does not report success", async () => {
  const p = proposal(),
    s = storage(),
    d = mockDevice(p);
  d.uploadFirChannel = async () => {};
  await assert.rejects(
    fir.applyFirVersion(
      d,
      s,
      { version: 1, proposal: p, state: "pending" },
      "B",
      true
    ),
    /FIR_VERIFY/
  );
  assert.equal(fir.loadFirBackup(s, p.device).state, "incomplete");
});
test("zero FIR metrics are finite and do not invent sample rate", () => {
  const p = { left: Array(8192).fill(0), right: Array(8192).fill(0) };
  const m = fir.firMetrics(p);
  assert.equal(m.sample_rate, null);
  assert.equal(m.left.late_energy_ratio, 0);
});

test('A/B WAV exports preserve coefficients and signed zero', () => {
 const before = pair(); const after = fir.renderFir(before, adjustment({tail_gain_db: -6}));
 for (const value of [before, after]) {
  const files = fir.firPairWavs(value);
  for (const side of ['left', 'right']) {
   const view = new DataView(files[side]);
   assert.equal(view.getUint16(20, true), 3);
   assert.equal(view.getUint32(24, true), 48000);
   assert.deepEqual(fir.decodeFir(files[side].slice(58)), value[side].map(Math.fround));
  }
 }
});