import express from 'express';
import { HttpError } from './matchService.js';
import { publicPools } from './mapPools.js';
import { createRateLimiter, safeEqual } from './security.js';
import { createAdminRouter } from './adminRoutes.js';

function bearer(req) {
  const header = req.get('authorization') ?? '';
  return header.startsWith('Bearer ') ? header.slice(7).trim() : null;
}

/** Bis zu zwei Zugänge: Authorization (Organisator, Spieler oder Zuschauer) und X-Player-Token. */
function accessTokens(req) {
  return [bearer(req), req.get('x-player-token')?.trim() || null];
}

export function createApiRouter({ service, manager, config, pools, adapter, settings, knife }) {
  const router = express.Router();

  // Live-Logs vom CS2-Server (logaddress_add_http). Vor dem JSON-Parser, weil CS2 Klartext sendet.
  // Der Schlüssel in der URL ist pro Server und Match zufällig und nur im Backend bekannt.
  router.post('/logs/:id/:key', express.text({ type: () => true, limit: '2mb' }), (req, res) => {
    try {
      const body = typeof req.body === 'string' ? req.body : '';
      // LOG_DEBUG=true: empfangene Zeilen ausgeben, z. B. um das Logformat eines Servers zu prüfen
      if (config.logDebug) console.log(`[logs ${req.params.id}] ${body.trim().replace(/\n/g, `\n[logs ${req.params.id}] `)}`);
      service.ingestLogs(req.params.id, req.params.key, body);
      res.status(200).end();
    } catch (err) {
      res.status(err.status ?? 500).end();
    }
  });

  router.use(express.json({ limit: '32kb' }));
  router.use('/admin', createAdminRouter({ service, manager, config, settings, knife }));

  const limiters = {
    create: createRateLimiter({ windowMs: 60_000, max: 10 }),
    code: createRateLimiter({ windowMs: 60_000, max: 20 }),
    action: createRateLimiter({ windowMs: 60_000, max: 120 }),
  };
  const limit = (name) => (req, res, next) => {
    if (!limiters[name](`${name}:${req.ip}`)) {
      return next(new HttpError(429, 'Zu viele Anfragen – bitte kurz warten', 'rate_limited'));
    }
    next();
  };

  const wrap = (fn) => async (req, res, next) => {
    try {
      const result = await fn(req, res);
      if (!res.headersSent) res.json(result ?? { ok: true });
    } catch (err) {
      next(err);
    }
  };

  // Ermittelt die Rolle des Aufrufers für das Match in der URL.
  const viewerFor = (req) => {
    const viewer = service.resolveViewer(req.params.id, accessTokens(req));
    service.touch(req.params.id);
    return viewer;
  };

  router.get('/config', wrap(() => ({
    pools: publicPools(pools),
    createRequiresPassword: Boolean(config.createMatchPassword),
    requireFullTeams: config.requireFullTeams,
    server: { adapter: adapter.name, simulated: adapter.simulated, idleTimeoutMinutes: config.idleTimeoutMinutes },
  })));

  router.get('/matches', wrap(() => ({ matches: service.listMatches() })));

  // Messer-Server für die Seitenwahl: offen, ohne Passwort, deshalb für alle sichtbar
  router.get('/knife-servers', wrap(() => ({ servers: knife.list().filter((k) => k.status === 'running') })));

  // Stream-Übersicht aller Matches; mit STREAM_KEY nur mit passendem ?key=
  router.get('/stream/overview', wrap((req) => {
    if (config.streamKey && !safeEqual(String(req.query.key ?? ''), config.streamKey)) {
      throw new HttpError(403, 'Für die Stream-Übersicht wird der Stream-Schlüssel benötigt', 'forbidden');
    }
    return service.streamOverview();
  }));

  router.post('/matches', limit('create'), wrap((req) => {
    const { teamA, teamB, mode, format, vetoStart, password } = req.body ?? {};
    if (config.createMatchPassword && !safeEqual(password ?? '', config.createMatchPassword)) {
      throw new HttpError(403, 'Falsches Passwort zum Erstellen von Matches', 'forbidden');
    }
    const { id, organizerToken } = service.createMatch({ teamA, teamB, mode, format, vetoStart });
    return { id, organizerToken };
  }));

  router.post('/access', limit('code'), wrap((req) => {
    const { matchId, access, team, match } = service.lookupCode(req.body?.code);
    return {
      matchId,
      access,
      team,
      teamName: team ? service.teamName(match, team) : null,
      title: `${match.team_a_name} vs. ${match.team_b_name}`,
      status: match.status,
    };
  }));

  router.get('/matches/:id', wrap((req) => service.snapshot(req.params.id, viewerFor(req))));

  router.post('/matches/:id/join', limit('code'), wrap((req) => {
    service.getMatch(req.params.id);
    return service.join(req.params.id, req.body ?? {});
  }));

  const action = (path, handler) => router.post(`/matches/:id/${path}`, limit('action'), wrap((req) => handler(viewerFor(req), req.body ?? {})));

  action('ready', (v, b) => service.setReady(v, Boolean(b.ready)));
  action('leave', (v) => service.leave(v));
  action('kick', (v, b) => service.kick(v, b.playerId));
  action('captain', (v, b) => service.setCaptain(v, b.playerId));
  action('codes/regenerate', (v, b) => service.regenerateCode(v, b.target));
  action('veto/start', (v) => service.startVeto(v));
  action('veto/action', (v, b) => service.vetoAction(v, b));
  action('server/retry', (v) => manager.retry(v));
  action('server/stop', (v) => manager.stopByOrganizer(v));
  action('server/warmup-end', (v) => manager.endWarmup(v));
  action('series/next', (v) => manager.loadNextMap(v));
  action('finish', (v) => service.close(v, 'finished'));
  action('cancel', (v) => service.close(v, 'cancelled'));

  router.use((req, res, next) => next(new HttpError(404, 'Unbekannter Endpunkt', 'not_found')));

  // eslint-disable-next-line no-unused-vars
  router.use((err, req, res, next) => {
    const status = err.status ?? 500;
    if (status >= 500) console.error(err);
    res.status(status).json({
      error: status >= 500 && !err.code ? 'Interner Fehler' : err.message,
      code: err.code ?? 'error',
    });
  });

  return router;
}