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

import { startNearIntentsWs } from '../src/venues/near-intents/ws.mjs';

function delay(ms) {
  return new Promise((resolve) => setTimeout(resolve, ms));
}

function installMockWebSocket() {
  const original = globalThis.WebSocket;
  const instances = [];

  class MockWebSocket {
    static CONNECTING = 0;
    static OPEN = 1;
    static CLOSING = 2;
    static CLOSED = 3;

    constructor(url, options) {
      this.url = url;
      this.options = options;
      this.readyState = MockWebSocket.CONNECTING;
      this.sent = [];
      this.listeners = new Map();
      this.closeCalls = 0;
      this.emitErrorDuringClose = false;
      instances.push(this);
    }

    addEventListener(type, listener) {
      const existing = this.listeners.get(type) || [];
      existing.push(listener);
      this.listeners.set(type, existing);
    }

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

    close() {
      this.closeCalls += 1;
      if (this.readyState === MockWebSocket.CLOSED) return;
      if (this.emitErrorDuringClose) {
        this.emit('error', new Error('socket failed while closing'));
      }
      this.readyState = MockWebSocket.CLOSED;
      this.emit('close', {});
    }

    open() {
      this.readyState = MockWebSocket.OPEN;
      this.emit('open', {});
    }

    error(error = new Error('socket failed')) {
      this.emit('error', error);
    }

    emit(type, event) {
      for (const listener of this.listeners.get(type) || []) listener(event);
    }
  }

  globalThis.WebSocket = MockWebSocket;

  return {
    instances,
    restore() {
      globalThis.WebSocket = original;
    },
  };
}

test('near intents ingest reconnects after websocket error before open without runtime close', async () => {
  const mock = installMockWebSocket();
  const producer = { sendJson: async () => {} };
  const client = await startNearIntentsWs({
    apiKey: 'api-key',
    wsUrl: 'wss://relay.example/ws',
    pairFilter: ['btc', 'eure'],
    producer,
    rawTopic: 'raw.near_intents.quote',
    normalizedTopic: 'norm.swap_demand',
    reconnectDelayMs: 1,
  });

  try {
    assert.equal(mock.instances.length, 1);
    mock.instances[0].error(new Error('network failed'));
    await delay(10);

    assert.equal(client.getState().connected, false);
    assert.ok(client.getState().reconnect_count >= 2);
    assert.ok(mock.instances.length >= 2);

    mock.instances[1].open();
    assert.equal(client.getState().connected, true);
    assert.equal(mock.instances[1].sent.length, 2);
  } finally {
    client.close();
    mock.restore();
  }
});

test('near intents websocket close is reentrant-safe when close emits an error', async () => {
  const mock = installMockWebSocket();
  const errors = [];
  const producer = { sendJson: async () => {} };
  const logger = {
    error: (event) => errors.push(event),
    info: () => {},
    warn: () => {},
  };
  const client = await startNearIntentsWs({
    apiKey: 'api-key',
    wsUrl: 'wss://relay.example/ws',
    pairFilter: ['btc', 'eure'],
    producer,
    rawTopic: 'raw.near_intents.quote',
    normalizedTopic: 'norm.swap_demand',
    logger,
    reconnectDelayMs: 1,
  });

  try {
    assert.equal(mock.instances.length, 1);
    mock.instances[0].open();
    mock.instances[0].emitErrorDuringClose = true;

    assert.doesNotThrow(() => {
      mock.instances[0].error(new Error('network failed'));
    });
    await delay(10);

    assert.equal(mock.instances[0].closeCalls, 1);
    assert.equal(errors.filter((event) => event === 'socket_error').length, 1);
    assert.equal(client.getState().connected, false);
    assert.ok(client.getState().reconnect_count >= 2);
    assert.ok(mock.instances.length >= 2);
  } finally {
    client.close();
    mock.restore();
  }
});