import { expect, tap } from '@git.zone/tstest/tapbundle';
import * as path from 'path';
import * as fs from 'fs';
import * as childProcess from 'child_process';
import * as os from 'os';
import { RustBridge } from '../ts/classes.rustbridge.js';
import type { ICommandDefinition } from '../ts/interfaces/index.js';

const testDir = path.resolve(path.dirname(new URL(import.meta.url).pathname));
const mockServerPath = path.join(testDir, 'helpers/mock-socket-server.mjs');

// Define the command types for our mock binary
type TMockCommands = {
  echo: { params: Record<string, any>; result: Record<string, any> };
  largeEcho: { params: Record<string, any>; result: Record<string, any> };
  error: { params: {}; result: never };
  emitEvent: { params: { eventName: string; eventData: any }; result: null };
  slow: { params: {}; result: { delayed: boolean } };
  exit: { params: {}; result: null };
  streamEcho: { params: { count: number }; chunk: { index: number; value: string }; result: { totalChunks: number } };
  streamError: { params: {}; chunk: { index: number; value: string }; result: never };
  streamEmpty: { params: {}; chunk: never; result: { totalChunks: number } };
};

/**
 * Start the mock socket server and return the socket path.
 * Returns { proc, socketPath }.
 */
async function startMockServer(testName: string): Promise<{ proc: childProcess.ChildProcess; socketPath: string }> {
  const socketPath = path.join(os.tmpdir(), `smartrust-test-${Date.now()}-${testName}.sock`);

  const proc = childProcess.spawn('node', [mockServerPath, socketPath], {
    stdio: ['pipe', 'pipe', 'pipe'],
  });

  // Wait for the server to signal readiness via stdout
  return new Promise((resolve, reject) => {
    let stdoutData = '';
    const timeout = setTimeout(() => {
      proc.kill();
      reject(new Error('Mock server did not start within 5s'));
    }, 5000);

    proc.stdout!.on('data', (data: Buffer) => {
      stdoutData += data.toString();
      const lines = stdoutData.split('\n');
      for (const line of lines) {
        if (line.trim()) {
          try {
            const parsed = JSON.parse(line.trim());
            if (parsed.ready) {
              clearTimeout(timeout);
              resolve({ proc, socketPath: parsed.socketPath });
              return;
            }
          } catch { /* not JSON yet */ }
        }
      }
    });

    proc.on('error', (err) => {
      clearTimeout(timeout);
      reject(err);
    });

    proc.on('exit', (code) => {
      clearTimeout(timeout);
      reject(new Error(`Mock server exited with code ${code}`));
    });
  });
}

function stopMockServer(proc: childProcess.ChildProcess, socketPath: string) {
  try { proc.kill('SIGTERM'); } catch { /* ignore */ }
  try { fs.unlinkSync(socketPath); } catch { /* ignore */ }
}

// === Socket Transport Tests via RustBridge.connect() ===

tap.test('socket: should connect and receive ready event', async () => {
  const { proc, socketPath } = await startMockServer('connect-ready');
  try {
    const bridge = new RustBridge<TMockCommands>({
      binaryName: 'mock-daemon',
      readyTimeoutMs: 5000,
    });

    const result = await bridge.connect(socketPath);
    expect(result).toBeTrue();
    expect(bridge.running).toBeTrue();

    bridge.kill();
    expect(bridge.running).toBeFalse();
  } finally {
    stopMockServer(proc, socketPath);
  }
});

tap.test('socket: should send command and receive response', async () => {
  const { proc, socketPath } = await startMockServer('send-command');
  try {
    const bridge = new RustBridge<TMockCommands>({
      binaryName: 'mock-daemon',
      readyTimeoutMs: 5000,
    });

    await bridge.connect(socketPath);

    const result = await bridge.sendCommand('echo', { hello: 'world', num: 42 });
    expect(result).toEqual({ hello: 'world', num: 42 });

    bridge.kill();
  } finally {
    stopMockServer(proc, socketPath);
  }
});

tap.test('socket: should handle error responses', async () => {
  const { proc, socketPath } = await startMockServer('error-response');
  try {
    const bridge = new RustBridge<TMockCommands>({
      binaryName: 'mock-daemon',
      readyTimeoutMs: 5000,
    });

    await bridge.connect(socketPath);

    let threw = false;
    try {
      await bridge.sendCommand('error', {});
    } catch (err: any) {
      threw = true;
      expect(err.message).toInclude('Test error message');
    }
    expect(threw).toBeTrue();

    bridge.kill();
  } finally {
    stopMockServer(proc, socketPath);
  }
});

tap.test('socket: should receive custom events', async () => {
  const { proc, socketPath } = await startMockServer('custom-events');
  try {
    const bridge = new RustBridge<TMockCommands>({
      binaryName: 'mock-daemon',
      readyTimeoutMs: 5000,
    });

    await bridge.connect(socketPath);

    const eventPromise = new Promise<any>((resolve) => {
      bridge.once('management:testEvent', (data) => resolve(data));
    });

    await bridge.sendCommand('emitEvent', {
      eventName: 'testEvent',
      eventData: { key: 'value' },
    });

    const eventData = await eventPromise;
    expect(eventData).toEqual({ key: 'value' });

    bridge.kill();
  } finally {
    stopMockServer(proc, socketPath);
  }
});

tap.test('socket: should handle multiple concurrent commands', async () => {
  const { proc, socketPath } = await startMockServer('concurrent');
  try {
    const bridge = new RustBridge<TMockCommands>({
      binaryName: 'mock-daemon',
      readyTimeoutMs: 5000,
    });

    await bridge.connect(socketPath);

    const results = await Promise.all([
      bridge.sendCommand('echo', { id: 1 }),
      bridge.sendCommand('echo', { id: 2 }),
      bridge.sendCommand('echo', { id: 3 }),
    ]);

    expect(results[0]).toEqual({ id: 1 });
    expect(results[1]).toEqual({ id: 2 });
    expect(results[2]).toEqual({ id: 3 });

    bridge.kill();
  } finally {
    stopMockServer(proc, socketPath);
  }
});

tap.test('socket: should handle 1MB payload round-trip', async () => {
  const { proc, socketPath } = await startMockServer('large-payload');
  try {
    const bridge = new RustBridge<TMockCommands>({
      binaryName: 'mock-daemon',
      readyTimeoutMs: 5000,
      requestTimeoutMs: 30000,
    });

    await bridge.connect(socketPath);

    const largeString = 'x'.repeat(1024 * 1024);
    const result = await bridge.sendCommand('largeEcho', { data: largeString });
    expect(result.data).toEqual(largeString);
    expect(result.data.length).toEqual(1024 * 1024);

    bridge.kill();
  } finally {
    stopMockServer(proc, socketPath);
  }
});

tap.test('socket: should disconnect without killing the daemon', async () => {
  const { proc, socketPath } = await startMockServer('no-kill-daemon');
  try {
    // First connection
    const bridge1 = new RustBridge<TMockCommands>({
      binaryName: 'mock-daemon',
      readyTimeoutMs: 5000,
    });
    await bridge1.connect(socketPath);
    expect(bridge1.running).toBeTrue();

    // Disconnect
    bridge1.kill();
    expect(bridge1.running).toBeFalse();

    // Second connection — daemon should still be alive
    const bridge2 = new RustBridge<TMockCommands>({
      binaryName: 'mock-daemon',
      readyTimeoutMs: 5000,
    });
    const result = await bridge2.connect(socketPath);
    expect(result).toBeTrue();
    expect(bridge2.running).toBeTrue();

    // Verify the daemon is functional
    const echoResult = await bridge2.sendCommand('echo', { reconnected: true });
    expect(echoResult).toEqual({ reconnected: true });

    bridge2.kill();
  } finally {
    stopMockServer(proc, socketPath);
  }
});

tap.test('socket: should stream responses via socket', async () => {
  const { proc, socketPath } = await startMockServer('streaming');
  try {
    const bridge = new RustBridge<TMockCommands>({
      binaryName: 'mock-daemon',
      readyTimeoutMs: 5000,
      requestTimeoutMs: 10000,
    });

    await bridge.connect(socketPath);

    const stream = bridge.sendCommandStreaming('streamEcho', { count: 5 });
    const chunks: Array<{ index: number; value: string }> = [];

    for await (const chunk of stream) {
      chunks.push(chunk);
    }

    expect(chunks.length).toEqual(5);
    for (let i = 0; i < 5; i++) {
      expect(chunks[i].index).toEqual(i);
      expect(chunks[i].value).toEqual(`chunk_${i}`);
    }

    const result = await stream.result;
    expect(result.totalChunks).toEqual(5);

    bridge.kill();
  } finally {
    stopMockServer(proc, socketPath);
  }
});

tap.test('socket: should return false when socket path does not exist', async () => {
  const bridge = new RustBridge<TMockCommands>({
    binaryName: 'mock-daemon',
    readyTimeoutMs: 3000,
  });

  const result = await bridge.connect('/tmp/nonexistent-smartrust-test.sock');
  expect(result).toBeFalse();
  expect(bridge.running).toBeFalse();
});

tap.test('socket: should throw when sending command while not connected', async () => {
  const bridge = new RustBridge<TMockCommands>({
    binaryName: 'mock-daemon',
  });

  let threw = false;
  try {
    await bridge.sendCommand('echo', {});
  } catch (err: any) {
    threw = true;
    expect(err.message).toInclude('not running');
  }
  expect(threw).toBeTrue();
});

export default tap.start();