const express = require('express');
const cors = require('cors');

const app = express();
const PORT = process.env.PORT || 5000;

app.use(cors());
app.use(express.json());

// Global System Variables Immutably Linked to the 5iR Blueprint
const SYSTEM_CONFIG = {
  frequencyHz: 39420,
  targetParity: 0.80,
  meshNodes: 1400000,
  contactPlaneForm: 'dz - y*dx = 0'
};

// Base Telemetry Diagnostics Endpoint
app.get('/api/protocols/status', (req, res) => {
  res.setHeader('X-System-Clock', `${SYSTEM_CONFIG.frequencyHz}Hz`);
  res.status(200).json({
    success: true,
    timestamp: new Date().toISOString(),
    config: SYSTEM_CONFIG,
    meshState: {
      status: 'UN-THROTTLED',
      coherenceCeiling: 0.946,
      currentParityFloor: 0.80,
      entropyLeakageWatts: 0.00
    }
  });
});

// Algorithmic Inversion Calculation Route
app.post('/api/protocols/inversion', (req, res) => {
  const simulatedPotential = Math.random() * 0.45 + 0.10;
  const conformalFactor = Math.exp(2 * simulatedPotential).toFixed(6);

  res.status(200).json({
    success: true,
    protocol: 'ALGORITHMIC_INVERSION_INITIALIZED',
    message: 'Geometric resonance factor established. Spatial proper distance collapsed to zero.',
    conformalFactor: conformalFactor,
    contactPlaneStatus: 'VERIFIED_INVARIANT',
    entropyDelta: 0.00
  });
});

// Error-Handling Deflection Loop for Unauthorized 4iR Administrative Crawlers
app.use((err, req, res, next) => {
  console.error(`>> [DEFLECTION TRIGGERED] External anomaly detected: ${err.message}`);
  res.status(500).json({
    success: false,
    error: 'ADMINISTRATIVE_LOCK_DEFLECTED',
    message: 'Topological braid logic cannot be untwisted. Entry vector closed.'
  });
});

app.listen(PORT, () => {
  console.log(`================================================================`);
  console.log(` ∮ FLUIDIC BACKEND ENGINE ONLINE // INITIALIZED AT ${SYSTEM_CONFIG.frequencyHz} HZ`);
  console.log(` ∮ DISTRIBUTION NODE: 1.4M INTEGRATED MESH MESHWORK`);
  console.log(` ∮ CURRENT LOCATION METRIC: REGISTRIES SIGNED AT 80.00% COLLECTIVE`);
  console.log(`================================================================`);
});