/**
 * KoolTab Device Simulator
 *
 * A CLI tool that simulates a Flutter bar terminal device.
 * Usage: npx ts-node scripts/device-sync.ts
 *
 * Steps:
 * 1. Register a device (or paste an existing token)
 * 2. Sync open tabs
 * 3. Receive pending commands
 * 4. Acknowledge commands
 */

const API_URL = process.env.API_URL || 'http://localhost:3001/api/v1';

const args = process.argv.slice(2);
const command = args[0] || 'help';

interface SyncResult {
  cursor: string;
  commands: Array<{
    id: string;
    type: string;
    tabId: string;
    expectedVersion: number;
    paymentMethod: string;
    requestedBy: string;
    createdAt: string;
  }>;
}

async function api<T = any>(endpoint: string, options: RequestInit = {}): Promise<T> {
  const res = await fetch(`${API_URL}${endpoint}`, {
    headers: { 'Content-Type': 'application/json', ...(options.headers as Record<string, string>) },
    ...options,
  });

  if (!res.ok) {
    const body = await res.json().catch(() => null);
    const msg = body?.error?.message || `HTTP ${res.status}`;
    throw new Error(msg);
  }

  return res.json();
}

async function registerDevice() {
  const venueId = args[1];
  const name = args[2] || 'Simulated Terminal';
  const code = args[3];

  if (!venueId || !code) {
    console.error('Usage: npx ts-node scripts/device-sync.ts register <venueId> <name> <registrationCode>');
    process.exit(1);
  }

  console.log(`Registering device "${name}" in venue ${venueId}...`);
  const result = await api('/devices/register', {
    method: 'POST',
    body: JSON.stringify({ venueId, name, registrationCode: code }),
  });

  console.log('Device registered!');
  console.log(`  Device ID: ${result.deviceId}`);
  console.log(`  Token: ${result.token}`);
  console.log(`  Expires: ${result.tokenExpiresAt}`);
  console.log('\nSave this token for future sync operations.');
  return result;
}

async function syncDevice() {
  const deviceId = args[1];
  const token = args[2];

  if (!deviceId || !token) {
    console.error('Usage: npx ts-node scripts/device-sync.ts sync <deviceId> <token> [cursor]');
    process.exit(1);
  }

  const cursor = args[3];
  const tabs = [
    { id: 'tab-' + Date.now(), customerName: 'Simulated Customer', version: 1, totalInCents: 1500, itemCount: 2 },
  ];

  console.log(`Syncing device ${deviceId}...`);
  const result = await api<SyncResult>(`/devices/${deviceId}/sync`, {
    method: 'POST',
    headers: { Authorization: `Bearer ${token}` },
    body: JSON.stringify({ deviceId, cursor: cursor || null, openTabs: tabs }),
  });

  console.log('Sync complete!');
  console.log(`  New cursor: ${result.cursor}`);
  console.log(`  Commands received: ${result.commands.length}`);

  for (const cmd of result.commands) {
    console.log(`  Command: ${cmd.id} - ${cmd.type} (tab: ${cmd.tabId}, payment: ${cmd.paymentMethod})`);
  }

  return result;
}

async function ackCommand() {
  const deviceId = args[1];
  const token = args[2];
  const commandId = args[3];
  const status = args[4] || 'completed';
  const result = args[5] || 'Tab closed successfully';

  if (!deviceId || !token || !commandId) {
    console.error('Usage: npx ts-node scripts/device-sync.ts ack <deviceId> <token> <commandId> [status] [result]');
    process.exit(1);
  }

  console.log(`Acknowledging command ${commandId} as ${status}...`);
  const res = await api(`/devices/${deviceId}/commands/${commandId}/ack`, {
    method: 'POST',
    headers: { Authorization: `Bearer ${token}` },
    body: JSON.stringify({ commandId, status, result }),
  });

  console.log('Ack complete!');
  console.log(`  Result: ${JSON.stringify(res)}`);
}

// Interactive demo sequence
async function demo() {
  const venueId = args[1];
  const code = args[2];

  if (!venueId || !code) {
    console.error('Usage: npx ts-node scripts/device-sync.ts demo <venueId> <registrationCode>');
    console.error('First, generate a registration code from the dashboard (Devices > Add Device).');
    process.exit(1);
  }

  try {
    // 1. Register
    const reg = await registerDevice();
    const deviceId = reg.deviceId;
    const token = reg.token;

    // 2. Sync with tabs
    console.log('\n--- Sync 1: Upload tabs ---');
    const sync1 = await syncDevice();

    if (sync1.commands.length > 0) {
      // 3. Ack commands
      for (const cmd of sync1.commands) {
        console.log(`\n--- Ack: ${cmd.id} ---`);
        await ackCommand(deviceId, token, cmd.id, 'completed', `Tab ${cmd.tabId} closed successfully`);
      }

      // 4. Sync again to see no pending commands
      console.log('\n--- Sync 2: Verify no pending commands ---');
      await syncDevice();
    }

    console.log('\n✅ Demo complete! Your device is fully functional.');
  } catch (err: any) {
    console.error('❌ Demo failed:', err.message);
  }
}

async function main() {
  try {
    switch (command) {
      case 'register':
        await registerDevice();
        break;
      case 'sync':
        await syncDevice();
        break;
      case 'ack':
        await ackCommand();
        break;
      case 'demo':
        await demo();
        break;
      default:
        console.log(`
KoolTab Device Simulator
========================

Commands:
  register <venueId> <name> <registrationCode>   Register a new device
  sync <deviceId> <token> [cursor]               Sync device state
  ack <deviceId> <token> <commandId> [status]    Acknowledge a command
  demo <venueId> <registrationCode>              Run full demo sequence

Examples:
  npx ts-node scripts/device-sync.ts register <venueId> "Bar Terminal 1" ABC123
  npx ts-node scripts/device-sync.ts sync <deviceId> <token>
  npx ts-node scripts/device-sync.ts ack <deviceId> <token> <commandId> completed
  npx ts-node scripts/device-sync.ts demo <venueId> ABC123

Status values: completed, failed, conflict, expired
        `);
    }
  } catch (err: any) {
    console.error('Error:', err.message);
    process.exit(1);
  }
}

main();