const test = require("node:test");
const assert = require("node:assert/strict");
const { loadConfig } = require("../src/config");
const { createRuntime } = require("../src/runtime");

const silentLogger = {
  info() {},
  warn() {},
  error() {},
};

function testConfig() {
  return loadConfig({
    NODE_ENV: "test",
    HOST: "127.0.0.1",
    PORT: "0",
    DATABASE_PATH: ":memory:",
    APP_TIMEZONE: "America/Chicago",
    SHUTDOWN_TIMEOUT_MS: "1000",
    S3_ENDPOINT: "http://seaweedfs:8333",
    S3_BUCKET: "announcements-test",
  });
}

function testStorage() {
  return {
    async start() {},
    stop() {},
    health() {
      return {
        status: "healthy",
        checkedAt: "2032-04-05T12:00:00.000Z",
        lastSuccessAt: "2032-04-05T12:00:00.000Z",
      };
    },
  };
}

async function jsonRequest(baseUrl, route, { body, ...init } = {}) {
  const response = await fetch(`${baseUrl}${route}`, {
    ...init,
    ...(body === undefined
      ? {}
      : {
          headers: { "content-type": "application/json", ...init.headers },
          body: JSON.stringify(body),
        }),
  });
  return { response, body: await response.json() };
}

function splitEnginePackets(payload) {
  return payload.split("\x1e").filter(Boolean);
}

function socketEvents(payload) {
  return splitEnginePackets(payload)
    .filter((packet) => packet.startsWith("42"))
    .map((packet) => JSON.parse(packet.slice(2)));
}

async function connectPollingSocket(baseUrl) {
  let requestNumber = 0;
  const endpoint = (sid) => {
    const parameters = new URLSearchParams({
      EIO: "4",
      transport: "polling",
      t: String(requestNumber++),
    });
    if (sid) parameters.set("sid", sid);
    return `${baseUrl}/socket.io/?${parameters}`;
  };

  const openingResponse = await fetch(endpoint());
  assert.equal(openingResponse.status, 200);
  const openingPackets = splitEnginePackets(await openingResponse.text());
  const openPacket = openingPackets.find((packet) => packet.startsWith("0"));
  assert.ok(openPacket, "Engine.IO must return an open packet");
  const { sid } = JSON.parse(openPacket.slice(1));

  const connectResponse = await fetch(endpoint(sid), {
    method: "POST",
    headers: { "content-type": "text/plain;charset=UTF-8" },
    body: "40",
  });
  assert.equal(connectResponse.status, 200);
  await connectResponse.text();

  const connectedResponse = await fetch(endpoint(sid));
  assert.equal(connectedResponse.status, 200);
  const connectedPayload = await connectedResponse.text();
  assert.ok(
    splitEnginePackets(connectedPayload).some((packet) =>
      packet.startsWith("40"),
    ),
    "Socket.IO must acknowledge the namespace connection",
  );

  return {
    async poll() {
      const response = await fetch(endpoint(sid), {
        signal: AbortSignal.timeout(3_000),
      });
      assert.equal(response.status, 200);
      return response.text();
    },
    async close() {
      const response = await fetch(endpoint(sid), {
        method: "POST",
        headers: { "content-type": "text/plain;charset=UTF-8" },
        body: "41",
      });
      await response.text();
    },
  };
}

test("Socket.IO publishes playlists:changed only after successful semantic mutations", async (t) => {
  const runtime = createRuntime({
    config: testConfig(),
    logger: silentLogger,
    storage: testStorage(),
  });
  await runtime.start();
  t.after(() => runtime.stop("test cleanup"));
  const baseUrl = `http://127.0.0.1:${runtime.address.port}`;
  const socket = await connectPollingSocket(baseUrl);
  t.after(() => socket.close().catch(() => {}));

  await jsonRequest(baseUrl, "/api/playlists");
  const invalid = await jsonRequest(baseUrl, "/api/playlists", {
    method: "POST",
    body: {},
  });
  assert.equal(invalid.response.status, 400);
  await jsonRequest(baseUrl, "/api/settings", {
    method: "PATCH",
    body: { defaultDurationMs: 7_000 },
  });

  const created = await jsonRequest(baseUrl, "/api/playlists", {
    method: "POST",
    body: { name: "Sunday" },
  });
  assert.equal(created.response.status, 201);
  let events = socketEvents(await socket.poll());
  assert.equal(events.length, 1);
  assert.equal(events[0][0], "playlists:changed");
  assert.equal(events[0][1].reason, "created");
  assert.equal(events[0][1].playlistId, created.body.id);

  const duplicate = await jsonRequest(baseUrl, "/api/playlists", {
    method: "POST",
    body: { name: "SUNDAY" },
  });
  assert.equal(duplicate.response.status, 409);
  await jsonRequest(baseUrl, `/api/playlists/${created.body.id}`, {
    method: "PATCH",
    body: { name: "Sunday" },
  });
  await jsonRequest(baseUrl, "/api/settings", {
    method: "PATCH",
    body: { defaultDurationMs: 8_000 },
  });
  events = socketEvents(await socket.poll());
  assert.deepEqual(events, [
    [
      "playlists:changed",
      {
        reason: "settings_updated",
        playlistIds: null,
        settingsRevision: 2,
      },
    ],
  ]);

  const second = await jsonRequest(baseUrl, "/api/playlists", {
    method: "POST",
    body: { name: "Midweek" },
  });
  assert.equal(second.response.status, 201);
  events = socketEvents(await socket.poll());
  assert.equal(events.length, 1);
  assert.equal(events[0][1].reason, "created");

  const activated = await jsonRequest(
    baseUrl,
    `/api/playlists/${created.body.id}/activate`,
    { method: "POST" },
  );
  assert.equal(activated.response.status, 200);
  assert.equal(activated.body.activation, "active");
  events = socketEvents(await socket.poll());
  assert.equal(events.length, 1);
  assert.equal(events[0][0], "playlists:changed");
  assert.equal(events[0][1].reason, "activated");
  assert.equal(events[0][1].playlistId, created.body.id);
  assert.equal(
    events[0][1].playbackRevision,
    activated.body.playback.revision,
  );

  const activeDelete = await jsonRequest(
    baseUrl,
    `/api/playlists/${created.body.id}`,
    { method: "DELETE" },
  );
  assert.equal(activeDelete.response.status, 409);
  assert.equal(activeDelete.body.error.code, "PLAYLIST_ACTIVE");
});