#!/usr/bin/env node
/**
 * Deploy the demo flow fresh and trace the first 60 seconds of behavior.
 * Captures: container logs, PS volume evolution, flow events.
 */

const http = require('http');
const fs = require('fs');
const path = require('path');
const { execSync } = require('child_process');

const NR_URL = 'http://localhost:1880';
const FLOW_FILE = path.join(__dirname, '..', 'docker', 'demo-flow.json');
const TRACE_SECONDS = 45;

function httpReq(method, urlPath, body) {
  return new Promise((resolve, reject) => {
    const parsed = new URL(NR_URL + urlPath);
    const opts = {
      hostname: parsed.hostname,
      port: parsed.port,
      path: parsed.pathname,
      method,
      headers: {
        'Content-Type': 'application/json',
        'Node-RED-Deployment-Type': 'full',
      },
    };
    if (body) {
      const buf = Buffer.from(JSON.stringify(body));
      opts.headers['Content-Length'] = buf.length;
    }
    const req = http.request(opts, (res) => {
      const chunks = [];
      res.on('data', (c) => chunks.push(c));
      res.on('end', () => {
        const text = Buffer.concat(chunks).toString();
        resolve({ status: res.statusCode, body: text });
      });
    });
    req.on('error', reject);
    if (body) req.write(JSON.stringify(body));
    req.end();
  });
}

function getLogs(since) {
  try {
    // Get ALL logs since our timestamp
    const cmd = `docker logs evolv-nodered --since ${since} 2>&1`;
    return execSync(cmd, { encoding: 'utf8', timeout: 5000 });
  } catch (e) {
    return 'Log error: ' + e.message;
  }
}

(async () => {
  console.log('=== Deploy & Trace ===');
  console.log('Loading flow from', FLOW_FILE);

  const flow = JSON.parse(fs.readFileSync(FLOW_FILE, 'utf8'));
  console.log(`Flow has ${flow.length} nodes`);

  // Deploy
  const deployTime = new Date().toISOString();
  console.log(`\nDeploying at ${deployTime}...`);
  const res = await httpReq('POST', '/flows', flow);
  console.log(`Deploy response: ${res.status}`);

  if (res.status !== 204 && res.status !== 200) {
    console.error('Deploy failed:', res.body);
    process.exit(1);
  }

  // Wait 3 seconds for initial setup
  console.log('Waiting 3s for init...\n');
  await new Promise((r) => setTimeout(r, 3000));

  // Trace loop
  const traceStart = Date.now();
  const volumeHistory = [];
  let lastLogPos = 0;

  for (let i = 0; i < Math.ceil(TRACE_SECONDS / 3); i++) {
    const elapsed = ((Date.now() - traceStart) / 1000).toFixed(1);

    // Get new logs since deploy
    const logs = getLogs(deployTime);
    const newLines = logs.split('\n').slice(lastLogPos);
    lastLogPos = logs.split('\n').length;

    // Parse interesting log lines
    const safeGuards = [];
    const pressureChanges = [];
    const modeChanges = [];
    const stateChanges = [];
    const other = [];

    newLines.forEach((line) => {
      if (!line.trim()) return;

      const volMatch = line.match(/vol=([-\d.]+) m3.*remainingTime=([\w.]+)/);
      if (volMatch) {
        safeGuards.push({ vol: parseFloat(volMatch[1]), remaining: volMatch[2] });
        return;
      }

      if (line.includes('Pressure change detected')) {
        pressureChanges.push(1);
        return;
      }

      if (line.includes('Mode changed') || line.includes('setMode') || line.includes('Control mode')) {
        modeChanges.push(line.trim().substring(0, 200));
        return;
      }

      if (line.includes('machine state') || line.includes('State:') || line.includes('startup') || line.includes('shutdown')) {
        stateChanges.push(line.trim().substring(0, 200));
        return;
      }

      if (line.includes('q_in') || line.includes('netflow') || line.includes('Volume') ||
          line.includes('Height') || line.includes('Level') || line.includes('Controllevel')) {
        other.push(line.trim().substring(0, 200));
        return;
      }
    });

    console.log(`--- t=${elapsed}s ---`);

    if (safeGuards.length > 0) {
      const latest = safeGuards[safeGuards.length - 1];
      const first = safeGuards[0];
      console.log(`  SAFETY: ${safeGuards.length} triggers, vol: ${first.vol} → ${latest.vol} m3, remaining: ${latest.remaining}s`);
      volumeHistory.push({ t: parseFloat(elapsed), vol: latest.vol });
    } else {
      console.log('  SAFETY: none (good)');
    }

    if (pressureChanges.length > 0) {
      console.log(`  PRESSURE: ${pressureChanges.length} changes`);
    }

    if (modeChanges.length > 0) {
      modeChanges.forEach((m) => console.log(`  MODE: ${m}`));
    }

    if (stateChanges.length > 0) {
      stateChanges.slice(-5).forEach((s) => console.log(`  STATE: ${s}`));
    }

    if (other.length > 0) {
      other.slice(-5).forEach((o) => console.log(`  INFO: ${o}`));
    }

    console.log('');
    await new Promise((r) => setTimeout(r, 3000));
  }

  // Final analysis
  console.log('\n=== Volume Trajectory ===');
  volumeHistory.forEach((v) => {
    const bar = '#'.repeat(Math.max(0, Math.round(v.vol / 2)));
    console.log(`  t=${String(v.t).padStart(5)}s: ${String(v.vol.toFixed(2)).padStart(8)} m3 ${bar}`);
  });

  if (volumeHistory.length >= 2) {
    const first = volumeHistory[0];
    const last = volumeHistory[volumeHistory.length - 1];
    const dt = last.t - first.t;
    const dv = last.vol - first.vol;
    const rate = dt > 0 ? (dv / dt * 3600).toFixed(1) : 'N/A';
    console.log(`\n  Rate: ${rate} m3/h (${dv > 0 ? 'FILLING' : 'DRAINING'})`);
  }

  // Get ALL logs for comprehensive analysis
  console.log('\n=== Full Log Analysis ===');
  const allLogs = getLogs(deployTime);
  const allLines = allLogs.split('\n');

  // Count different message types
  const counts = { safety: 0, pressure: 0, mode: 0, state: 0, error: 0, warn: 0, flow: 0 };
  allLines.forEach((l) => {
    if (l.includes('Safe guard')) counts.safety++;
    if (l.includes('Pressure change')) counts.pressure++;
    if (l.includes('Mode') || l.includes('mode')) counts.mode++;
    if (l.includes('startup') || l.includes('shutdown') || l.includes('machine state')) counts.state++;
    if (l.includes('[ERROR]') || l.includes('Error')) counts.error++;
    if (l.includes('[WARN]')) counts.warn++;
    if (l.includes('netflow') || l.includes('q_in') || l.includes('flow')) counts.flow++;
  });

  console.log('Message counts:', JSON.stringify(counts, null, 2));

  // Print errors
  const errors = allLines.filter((l) => l.includes('[ERROR]') || l.includes('Error'));
  if (errors.length > 0) {
    console.log('\nErrors:');
    errors.slice(0, 20).forEach((e) => console.log('  ' + e.trim().substring(0, 200)));
  }

  // Print first few non-pressure, non-safety lines
  console.log('\nKey events (first 30):');
  let keyCount = 0;
  allLines.forEach((l) => {
    if (keyCount >= 30) return;
    if (l.includes('Pressure change detected')) return;
    if (l.includes('Safe guard triggered')) return;
    if (!l.trim()) return;
    console.log('  ' + l.trim().substring(0, 200));
    keyCount++;
  });
})().catch((err) => {
  console.error('Failed:', err);
  process.exit(1);
});