import assert from "node:assert/strict";
import test from "node:test";

import { apiClient } from "@/lib/api";

test("multiple realtime subscribers share one WebSocket connection", async () => {
  const originalWindow = globalThis.window;
  const originalLocalStorage = globalThis.localStorage;
  const originalWebSocket = globalThis.WebSocket;
  const originalRequest = apiClient.request;

  class FakeWebSocket {
    static CONNECTING = 0;
    static OPEN = 1;
    static CLOSING = 2;
    static CLOSED = 3;
    static instances = [];

    constructor(url) {
      this.url = url;
      this.readyState = FakeWebSocket.CONNECTING;
      this.sent = [];
      FakeWebSocket.instances.push(this);
    }

    open() {
      this.readyState = FakeWebSocket.OPEN;
      this.onopen?.();
    }

    send(payload) {
      this.sent.push(JSON.parse(payload));
    }

    receive(payload) {
      this.onmessage?.({ data: JSON.stringify(payload) });
    }

    close() {
      this.readyState = FakeWebSocket.CLOSED;
      this.onclose?.({ code: 1000, reason: "", wasClean: true });
    }
  }

  globalThis.window = { addEventListener() {} };
  globalThis.localStorage = {
    getItem(key) {
      return key === "access_token" ? "test-token" : null;
    },
  };
  globalThis.WebSocket = FakeWebSocket;
  apiClient.request = async (endpoint) => {
    assert.equal(endpoint, "/api/auth/ws-ticket/");
    return { ticket: "single-use-ticket", expires_in: 30 };
  };

  try {
    const { default: manager } = await import("./websocketManager.ts");
    const unsubscribeMessages = manager.subscribe(() => {});
    const unsubscribeStatus = manager.subscribeStatus(() => {});

    await new Promise((resolve) => setTimeout(resolve, 0));

    assert.equal(FakeWebSocket.instances.length, 1);
    assert.match(FakeWebSocket.instances[0].url, /ticket=single-use-ticket/);
    assert.doesNotMatch(FakeWebSocket.instances[0].url, /token=/);

    const socket = FakeWebSocket.instances[0];
    socket.open();
    manager.setActiveChat(114);

    assert.equal(FakeWebSocket.instances.length, 1);
    assert.deepEqual(socket.sent.at(-1), {
      action: "open_chat",
      chat_id: 114,
      load_history: false,
    });

    socket.receive({ type: "ping", timestamp: "2026-08-17T12:00:00Z" });
    assert.deepEqual(socket.sent.at(-1), {
      action: "pong",
      timestamp: "2026-08-17T12:00:00Z",
    });

    unsubscribeMessages();
    unsubscribeStatus();
  } finally {
    globalThis.window = originalWindow;
    globalThis.localStorage = originalLocalStorage;
    globalThis.WebSocket = originalWebSocket;
    apiClient.request = originalRequest;
  }
});

test("connection recovers immediately when browser comes back online", async () => {
  const originalWindow = globalThis.window;
  const originalDocument = globalThis.document;
  const originalLocalStorage = globalThis.localStorage;
  const originalWebSocket = globalThis.WebSocket;
  const originalRequest = apiClient.request;
  const originalSetTimeout = globalThis.setTimeout;
  const originalClearTimeout = globalThis.clearTimeout;
  const originalSetInterval = globalThis.setInterval;
  const originalClearInterval = globalThis.clearInterval;
  const listeners = new Map();
  const scheduledTimeouts = [];
  const statuses = [];

  class FakeWebSocket {
    static OPEN = 1;
    static instances = [];

    constructor(url) {
      this.url = url;
      this.readyState = 0;
      FakeWebSocket.instances.push(this);
    }

    open() {
      this.readyState = FakeWebSocket.OPEN;
      this.onopen?.();
    }

    send() {}

    fail() {
      this.readyState = 3;
      this.onclose?.({ code: 1006, reason: "network", wasClean: false });
    }

    close() {
      this.readyState = 3;
    }
  }

  globalThis.window = {
    addEventListener(type, handler) {
      listeners.set(type, handler);
    },
  };
  globalThis.document = {
    visibilityState: "visible",
    addEventListener(type, handler) {
      listeners.set(type, handler);
    },
  };
  globalThis.localStorage = {
    getItem(key) {
      return key === "access_token" ? "access" : null;
    },
  };
  globalThis.WebSocket = FakeWebSocket;
  globalThis.setTimeout = (handler, delay) => {
    const timer = { handler, delay, cleared: false };
    scheduledTimeouts.push(timer);
    return timer;
  };
  globalThis.clearTimeout = (timer) => {
    timer.cleared = true;
  };
  globalThis.setInterval = () => ({ interval: true });
  globalThis.clearInterval = () => {};
  apiClient.request = async () => ({
    ticket: "recovery-ticket",
    expires_in: 30,
  });

  try {
    const { WebSocketManager } = await import("./websocketManager.ts");
    const manager = new WebSocketManager();
    const unsubscribe = manager.subscribe(() => {});
    const unsubscribeStatus = manager.subscribeStatus((status) =>
      statuses.push(status),
    );
    await new Promise((resolve) => originalSetTimeout(resolve, 0));
    assert.equal(FakeWebSocket.instances.length, 1);

    FakeWebSocket.instances[0].open();
    FakeWebSocket.instances[0].fail();
    assert.equal(statuses.at(-1).lastCloseCode, 1006);
    assert.equal(statuses.at(-1).lastCloseReason, "network");
    assert.equal(scheduledTimeouts.length, 1);
    assert.ok(scheduledTimeouts[0].delay >= 1600);
    assert.ok(scheduledTimeouts[0].delay <= 2400);

    listeners.get("online")?.();
    await new Promise((resolve) => originalSetTimeout(resolve, 0));
    assert.equal(scheduledTimeouts[0].cleared, true);
    assert.equal(FakeWebSocket.instances.length, 2);
    unsubscribe();
    unsubscribeStatus();
  } finally {
    globalThis.window = originalWindow;
    globalThis.document = originalDocument;
    globalThis.localStorage = originalLocalStorage;
    globalThis.WebSocket = originalWebSocket;
    globalThis.setTimeout = originalSetTimeout;
    globalThis.clearTimeout = originalClearTimeout;
    globalThis.setInterval = originalSetInterval;
    globalThis.clearInterval = originalClearInterval;
    apiClient.request = originalRequest;
  }
});