// server/InfoServer.js
'use strict';

const express            = require('express');
const https              = require('https');
const path               = require('path');
const robotConfigService = require('./RobotConfigService');

const PUBLIC_DIR = path.join(__dirname, '..', 'public');

function createInfoServer(httpsOptions, sharedState, robot, GCode, senders, options = {}) {
  const app = express();

  // ── Statische Dateien ────────────────────────────────────────────────────
  const staticFile = (file) => (req, res) =>
    res.sendFile(path.join(PUBLIC_DIR, file), err => {
      if (err) res.status(404).end('Not found');
    });

  app.get('/',           staticFile('index.html'));
  app.get('/app.js',     staticFile('app.js'));
  app.get('/style.css',  staticFile('style.css'));
  app.get('/allApps.css', staticFile('allApps.css'));

  // ── API ──────────────────────────────────────────────────────────────────
  app.get('/api/status', (req, res) => {
    const sendersStatus = senders.map(({ name, instance, isGCodeReceiver }) => {
      const status = instance?.getStatus ? instance.getStatus() : {
        state:           instance?.isTestMode ? 'connected' : instance?.tSocket ? 'connected' : 'disconnected',
        url:             instance?.url    || null,
        error:           instance?.error  || null,
        isTestMode:      !!instance?.isTestMode,
        reconnectAttempt: instance?.reconnectAttempt || 0,
        reconnectTimer:  !!instance?.reconnectTimer
      };

      const state  = status.state || (instance?.tSocket ? 'connected' : 'disconnected');
      const health = state === 'connected'    ? 'ok'
                   : state === 'reconnecting' ? 'warning'
                   :                           'disconnected';
      const reason = state === 'disconnected'
        ? status.error || 'no active socket connection'
        : undefined;

      return {
        name,
        isGCodeReceiver:  isGCodeReceiver !== false,   // false nur für Shelly
        state,
        url:              status.url             || null,
        isTestMode:       !!status.isTestMode,
        error:            status.error           || null,
        reconnectAttempt: status.reconnectAttempt || 0,
        reconnectTimer:   !!status.reconnectTimer,
        health,
        reason,
        // Hardware-Feedback (ToDo_9 Paket 1/3): GRBL-Zustand aus dem Sender.
        grblState:         status.grblState         ?? null,
        machinePosition:   status.machinePosition   ?? null,
        plannerBlocksFree: status.plannerBlocksFree ?? null,
        rxBytesFree:       status.rxBytesFree        ?? null,
        lastError:         status.lastError          ?? null,
        lastReportAt:      status.lastReportAt       ?? null
      };
    });

    const connectedSenders = sendersStatus.filter(s => s.health === 'ok').length;
    res.json({
      generatedAt: new Date().toISOString(),
      health: {
        ok:               sendersStatus.length > 0 && sendersStatus.every(s => s.health === 'ok'),
        connectedSenders,
        totalSenders:     sendersStatus.length
      },
      clients:      sharedState.connectedClients,
      senders:      sendersStatus,
      lastCommands: sharedState.lastCommands,
      lastPings:    sharedState.lastPings
    });
  });

  app.get('/api/position', (req, res) => {
    res.json(JSON.parse(GCode.getM114(robot)));
  });

  // ── Robot-Config-Service ─────────────────────────────────────────────────
  robotConfigService.register(app, { apiKey: options.apiKey });

  // ── Power Status (Shelly) ────────────────────────────────────────────────
  //
  // GET /api/power-status
  //   Fragt den Shelly-Controller nach dem aktuellen Schaltzustand.
  //   Antwort: { ok, armed: bool, voltage?, power? }
  //   armed:true  → output:true  → Strom AN  → Roboter bestromt ("armed")
  //   armed:false → output:false → Strom AUS → Roboter stromlos

  app.get('/api/power-status', async (req, res) => {
    const shelly = senders.find(({ instance }) => typeof instance.getArmed === 'function');
    if (!shelly) {
      return res.json({ ok: false, armed: false, error: 'no shelly configured' });
    }
    const result = await shelly.instance.getArmed();
    res.json(result);
  });

  // ── Emergency Stop ───────────────────────────────────────────────────────
  //
  // POST /api/emergency-stop
  //   Ruft auf allen Sendern emergencyStop() auf (parallel).
  //   FluidNC-Sender: sendet '!' (Feed Hold).
  //   Shelly-Sender:  schaltet Strom ab.
  //   Aufruf vom Framework (Kopfzeile-Button): POST https://<host>:2098/api/emergency-stop
  //
  // POST /api/power-on
  //   Schaltet Strom über Shelly wieder ein (nach NotAus-Restart).
  //
  // POST /api/alarm-unlock
  //   Sendet '$X' an alle FluidNC-Controller (entsperrt ALARM-Zustand nach Strom-Neustart).
  //   Nur aufrufen, nachdem Roboterstellung manuell geprüft wurde.

  app.post('/api/emergency-stop', async (req, res) => {
    const settled = await Promise.allSettled(
      senders.map(({ name, instance }) =>
        instance.emergencyStop().then(r => ({ name, ...r }))
      )
    );
    const results = settled.map((r, i) =>
      r.status === 'fulfilled'
        ? r.value
        : { name: senders[i].name, ok: false, error: r.reason?.message }
    );
    const ok      = results.every(r => r.ok || r.skipped);
    const summary = results
      .map(r => `${r.name}:${r.skipped ? 'skip' : r.ok ? 'ok' : `FAIL(${r.error})`}`)
      .join(', ');
    console.warn(`⚠️  [EmergencyStop] ${new Date().toISOString()} — [${summary}]`);
    res.json({ ok, at: new Date().toISOString(), results });
  });

  app.post('/api/power-on', async (req, res) => {
    const shellyEntries = senders.filter(({ instance }) =>
      typeof instance.powerOn === 'function'
    );
    const settled = await Promise.allSettled(
      shellyEntries.map(({ name, instance }) => instance.powerOn().then(r => ({ name, ...r })))
    );
    const results = settled.map(r =>
      r.status === 'fulfilled' ? r.value : { ok: false, error: r.reason?.message }
    );
    const ok      = results.length > 0 && results.every(r => r.ok);
    const summary = results.map(r => `${r.name}:${r.ok ? 'ok' : `FAIL(${r.error})`}`).join(', ');
    console.warn(`⚠️  [PowerOn] ${new Date().toISOString()} — [${summary || 'keine Shelly konfiguriert'}]`);
    res.json({ ok, at: new Date().toISOString(), results });
  });

  app.post('/api/alarm-unlock', async (req, res) => {
    const settled = await Promise.allSettled(
      senders.map(({ name, instance }) =>
        instance.alarmUnlock().then(r => ({ name, ...r }))
      )
    );
    const results = settled.map((r, i) =>
      r.status === 'fulfilled'
        ? r.value
        : { name: senders[i].name, ok: false, error: r.reason?.message }
    );
    const ok      = results.every(r => r.ok || r.skipped);
    const summary = results
      .map(r => `${r.name}:${r.skipped ? 'skip' : r.ok ? 'ok' : `FAIL(${r.error})`}`)
      .join(', ');
    console.warn(`⚠️  [AlarmUnlock] ${new Date().toISOString()} — [${summary}]`);
    res.json({ ok, at: new Date().toISOString(), results });
  });

  // ── 404 ──────────────────────────────────────────────────────────────────
  app.use((req, res) => res.status(404).end('Not found'));

  return https.createServer(httpsOptions, app);
}

module.exports = createInfoServer;