import { expect, tap } from '@git.zone/tstest/tapbundle';
import * as smartipc from '../ts/index.js';
import * as smartdelay from '@push.rocks/smartdelay';
import * as plugins from '../ts/smartipc.plugins.js';
import * as fs from 'fs';
import * as path from 'path';

let server: smartipc.IpcServer;
let client: smartipc.IpcClient;

tap.test('setup TCP server and client (streaming)', async () => {
  server = smartipc.SmartIpc.createServer({
    id: 'stream-test-server',
    host: '127.0.0.1',
    port: 19876,
    heartbeat: false
  });
  await server.start();

  client = smartipc.SmartIpc.createClient({
    id: 'stream-test-server',
    host: '127.0.0.1',
    port: 19876,
    clientId: 'stream-client-1',
    heartbeat: false
  });
  await client.connect();
  expect(client.getIsConnected()).toBeTrue();
});

tap.test('client -> server streaming large payload', async () => {
  // Create ~5MB buffer
  const size = 5 * 1024 * 1024 + 123; // add some non-chunk-aligned bytes
  const data = Buffer.alloc(size);
  for (let i = 0; i < size; i++) data[i] = i % 251;

  const received: Buffer[] = [];
  const done = new Promise<void>((resolve, reject) => {
    server.on('stream', (info: any, readable: plugins.stream.Readable) => {
      // only handle our test stream
      if (info?.meta?.direction === 'client-to-server') {
        readable.on('data', chunk => received.push(Buffer.from(chunk)));
        readable.on('end', resolve);
        readable.on('error', reject);
      }
    });
  });

  // Send stream from client
  const readable = plugins.stream.Readable.from(data);
  await client.sendStream(readable, { meta: { direction: 'client-to-server' }, chunkSize: 64 * 1024 });

  await done;
  const result = Buffer.concat(received);
  expect(result.length).toEqual(data.length);
  expect(result.equals(data)).toBeTrue();
});

tap.test('server -> client streaming large payload', async () => {
  const size = 6 * 1024 * 1024 + 7;
  const data = Buffer.alloc(size);
  for (let i = 0; i < size; i++) data[i] = (i * 7) % 255;

  const received: Buffer[] = [];
  const done = new Promise<void>((resolve, reject) => {
    client.on('stream', (info: any, readable: plugins.stream.Readable) => {
      if (info?.meta?.direction === 'server-to-client') {
        readable.on('data', chunk => received.push(Buffer.from(chunk)));
        readable.on('end', resolve);
        readable.on('error', reject);
      }
    });
  });

  const readable = plugins.stream.Readable.from(data);
  await server.sendStreamToClient('stream-client-1', readable, { meta: { direction: 'server-to-client' }, chunkSize: 64 * 1024 });

  await done;
  const result = Buffer.concat(received);
  expect(result.length).toEqual(data.length);
  expect(result.equals(data)).toBeTrue();
});

tap.test('client -> server file transfer to disk', async () => {
  const baseTmp1 = path.join(process.cwd(), '.nogit', 'tmp');
  fs.mkdirSync(baseTmp1, { recursive: true });
  const tmpDir = fs.mkdtempSync(path.join(baseTmp1, 'tmp-'));
  const srcPath = path.join(tmpDir, 'src.bin');
  const dstPath = path.join(tmpDir, 'dst.bin');

  // Prepare file ~1MB
  const size = 1024 * 1024 + 333;
  const buf = Buffer.alloc(size);
  for (let i = 0; i < size; i++) buf[i] = (i * 11) % 255;
  fs.writeFileSync(srcPath, buf);

  const done = new Promise<void>((resolve, reject) => {
    server.on('stream', async (info: any, readable: plugins.stream.Readable) => {
      if (info?.meta?.type === 'file' && info?.meta?.basename === 'src.bin') {
        try {
          await smartipc.pipeStreamToFile(readable, dstPath);
          resolve();
        } catch (e) {
          reject(e);
        }
      }
    });
  });

  await client.sendFile(srcPath);
  await done;
  const out = fs.readFileSync(dstPath);
  expect(out.equals(buf)).toBeTrue();
});

tap.test('server -> client file transfer to disk', async () => {
  const baseTmp2 = path.join(process.cwd(), '.nogit', 'tmp');
  fs.mkdirSync(baseTmp2, { recursive: true });
  const tmpDir = fs.mkdtempSync(path.join(baseTmp2, 'tmp-'));
  const srcPath = path.join(tmpDir, 'serverfile.bin');
  const dstPath = path.join(tmpDir, 'clientfile.bin');

  const size = 512 * 1024 + 77;
  const buf = Buffer.alloc(size);
  for (let i = 0; i < size; i++) buf[i] = (i * 17) % 251;
  fs.writeFileSync(srcPath, buf);

  const done = new Promise<void>((resolve, reject) => {
    client.on('stream', async (info: any, readable: plugins.stream.Readable) => {
      if (info?.meta?.type === 'file' && info?.meta?.basename === 'serverfile.bin') {
        try {
          await smartipc.pipeStreamToFile(readable, dstPath);
          resolve();
        } catch (e) {
          reject(e);
        }
      }
    });
  });

  await server.sendFileToClient('stream-client-1', srcPath);
  await done;
  const out = fs.readFileSync(dstPath);
  expect(out.equals(buf)).toBeTrue();
});

tap.test('receiver cancels an incoming stream', async () => {
  // Create a slow readable that emits many chunks
  const bigChunk = Buffer.alloc(128 * 1024, 1);
  let pushed = 0;
  const readable = new plugins.stream.Readable({
    read() {
      setTimeout(() => {
        if (pushed > 200) {
          this.push(null);
        } else {
          this.push(bigChunk);
          pushed++;
        }
      }, 5);
    }
  });

  let cancelled = false;
  const cancelPromise = new Promise<void>((resolve) => {
    server.on('stream', (info: any, r: plugins.stream.Readable) => {
      if (info?.meta?.direction === 'client-to-server-cancel') {
        // cancel after first chunk
        r.once('data', async () => {
          cancelled = true;
          // send cancel back to sender
          await (server as any).primaryChannel.cancelIncomingStream(info.streamId, { clientId: info.clientId });
          resolve();
        });
        r.on('error', () => { /* ignore cancellation error */ });
        // drain to trigger data
        r.resume();
      }
    });
  });

  const sendPromise = client
    .sendStream(readable, { meta: { direction: 'client-to-server-cancel' } })
    .catch(() => { /* expected due to cancel */ });
  await cancelPromise;
  expect(cancelled).toBeTrue();
  await sendPromise;
});

tap.test('enforce maxConcurrentStreams option', async () => {
  // Setup separate low-limit server/client
  const srv = smartipc.SmartIpc.createServer({ id: 'limit-srv', host: '127.0.0.1', port: 19999, heartbeat: false, maxConcurrentStreams: 1 });
  await srv.start();
  const cli = smartipc.SmartIpc.createClient({ id: 'limit-srv', host: '127.0.0.1', port: 19999, clientId: 'limit-client', heartbeat: false, maxConcurrentStreams: 1 });
  await cli.connect();

  const r1 = plugins.stream.Readable.from(Buffer.alloc(256 * 1024));
  const r2 = plugins.stream.Readable.from(Buffer.alloc(256 * 1024));
  const p1 = cli.sendStream(r1, { meta: { n: 1 } });
  let threw = false;
  try {
    await cli.sendStream(r2, { meta: { n: 2 } });
  } catch (e) {
    threw = true;
  }
  expect(threw).toBeTrue();
  await p1;
  await cli.disconnect();
  await srv.stop();
});

tap.test('cleanup streaming test', async () => {
  await client.disconnect();
  await server.stop();
  await smartdelay.delayFor(50);
});

export default tap.start();