// SPDX-License-Identifier: AGPL-3.0-or-later
import { existsSync } from 'node:fs';
import { resolve } from 'node:path';
import Fastify from 'fastify';
import fastifyCookie from '@fastify/cookie';
import fastifyRateLimit from '@fastify/rate-limit';
import fastifyStatic from '@fastify/static';
import fastifyWebsocket from '@fastify/websocket';
import { sql } from 'drizzle-orm';
import type { Config } from './config.ts';
import type { Db } from './db/client.ts';
import type { Generator } from './generator/index.ts';
import type { AmiClient } from './ami/client.ts';
import { settingsRoutes } from './routes/settings.ts';
import { HttpError, errorHandler, forbidden, notFound, sendError } from './errors.ts';
import { authRoutes } from './routes/auth.ts';
import { userRoutes } from './routes/users.ts';
import { oidcRoutes } from './routes/oidc.ts';
import { systemRoutes } from './routes/system.ts';
import { extensionRoutes } from './routes/extensions.ts';
import { trunkRoutes } from './routes/trunks.ts';
import { didRoutes } from './routes/dids.ts';
import { outboundRouteRoutes } from './routes/outbound.ts';
import { liveRoutes } from './live/hub.ts';
import { meRoutes } from './routes/me.ts';
import { mobileRoutes } from './routes/mobile.ts';
import { soundRoutes } from './routes/sounds.ts';
import { ringGroupRoutes } from './routes/ringgroups.ts';
import { queueRoutes } from './routes/queues.ts';
import { conferenceRoutes } from './routes/conferences.ts';
import { pagingRoutes } from './routes/paging.ts';
import { mohRoutes } from './routes/moh.ts';
import { deviceRoutes } from './routes/devices.ts';
import { provisioningRoutes } from './routes/provisioning.ts';
import { ivrRoutes } from './routes/ivrs.ts';
import { timeConditionRoutes } from './routes/timeconditions.ts';
import { announcementRoutes } from './routes/announcements.ts';
import { blockedRoutes } from './routes/blocked.ts';
import { callRoutes } from './routes/calls.ts';
import { recordingRoutes } from './routes/recordings.ts';
import { liveCallRoutes } from './routes/livecalls.ts';
import { integrationRoutes } from './routes/integrations.ts';
import { reportRoutes } from './routes/reports.ts';
import { aboutRoutes } from './routes/about.ts';
import { contactRoutes } from './routes/contacts.ts';

declare module 'fastify' {
  interface FastifyInstance {
    db: Db;
    config: Config;
    /** Decorated by the caller (index.ts, tests) before ready(): it needs app.log. */
    generator: Generator;
    /** Decorated by the caller too (tests pass a fake). */
    ami: Pick<AmiClient, 'action' | 'command' | 'isConnected'>;
  }
}

// Paths the SPA must never swallow (04 §1 step 5).
const NON_SPA = /^\/(api|prov|hooks)(\/|$)/;
const SAFE_METHODS = new Set(['GET', 'HEAD', 'OPTIONS']);
/** A Linphone setup link's token is the credential (07 §5): keep it out of the request log. */
export const logUrl = (url: string) => url.replace(/^(\/prov\/linphone\/)[^/?]+/i, '$1…');

export function buildApp(config: Config, db: Db, publicDir = resolve('public')) {
  const app = Fastify({
    trustProxy: config.TRUST_PROXY ? '127.0.0.1' : false,
    logger: {
      level: config.LOG_LEVEL,
      redact: [
        '*.password',
        '*.secret',
        '*.token',
        '*.pin',
        '*.Secret',
        'req.headers.authorization',
        'req.headers.cookie',
      ],
      serializers: {
        // Fastify's own req serializer, with the URL masked (M11-T8).
        req: (req) => ({
          method: req.method,
          url: logUrl(req.url),
          host: req.host,
          remoteAddress: req.ip,
          remotePort: req.socket?.remotePort,
        }),
      },
    },
  });

  app.decorate('db', db);
  app.decorate('config', config);
  app.decorateRequest('user', null);
  app.decorateRequest('sessionId', null);
  app.register(fastifyCookie);
  app.register(fastifyWebsocket);
  // Every route, per client IP (08 §2.4). Before the routes, so each one gets it; routes with
  // their own limits (login, /prov) or a stricter one say so in `config.rateLimit`.
  if (config.RATE_LIMIT_PER_MINUTE > 0)
    app.register(fastifyRateLimit, {
      max: config.RATE_LIMIT_PER_MINUTE,
      timeWindow: 60_000,
      errorResponseBuilder: (_req, ctx) =>
        new HttpError(429, 'rate_limited', `Too many requests, try again in ${ctx.after}`),
    });
  app.setErrorHandler(errorHandler);

  // CSRF (04 §2.2): browsers can't add this header cross-site without CORS, and CORS is off.
  // API-token requests (Authorization: Bearer) don't need it: requireAuth then ignores the cookie,
  // and a cross-site page can't set Authorization either.
  app.addHook('onRequest', async (req, reply) => {
    if (
      // The matched route, not req.url: the router decodes "/%61pi/…" to /api/… (M11-T8).
      (req.routeOptions.url ?? req.url).startsWith('/api/') &&
      !SAFE_METHODS.has(req.method) &&
      !req.headers.authorization?.startsWith('Bearer ') &&
      req.headers['x-requested-with'] !== 'selfphoneng'
    )
      return sendError(reply, forbidden('Missing X-Requested-With header', 'csrf'));
  });

  // Security headers on every response (08 §2.4). The softphone's WebSocket may live elsewhere
  // (WEBRTC_WS_URL, e.g. in dev), so its origin is allowed too. HSTS is the reverse proxy's job.
  const wsOrigins = [
    `wss://${config.PUBLIC_HOSTNAME}`,
    ...(config.WEBRTC_WS_URL ? [new URL(config.WEBRTC_WS_URL).origin] : []),
  ];
  const csp = [
    "default-src 'self'",
    `connect-src 'self' ${[...new Set(wsOrigins)].join(' ')}`,
    "media-src 'self' blob:",
    "img-src 'self' data:",
    "style-src 'self' 'unsafe-inline'",
    "frame-ancestors 'none'",
  ].join('; ');
  app.addHook('onSend', async (_req, reply) => {
    reply.header('Content-Security-Policy', csp);
    reply.header('X-Content-Type-Options', 'nosniff');
    reply.header('Referrer-Policy', 'same-origin');
    reply.header('Permissions-Policy', 'microphone=(self), camera=()');
  });

  app.get('/healthz', async (_req, reply) => {
    try {
      await db.execute(sql`select 1`);
      return { ok: true };
    } catch {
      return reply.code(503).send({ ok: false, reasons: ['db'] });
    }
  });

  app.register(authRoutes);
  app.register(userRoutes);
  app.register(oidcRoutes);
  app.register(systemRoutes);
  app.register(extensionRoutes);
  app.register(trunkRoutes);
  app.register(didRoutes);
  app.register(outboundRouteRoutes);
  app.register(settingsRoutes);
  app.register(liveRoutes);
  app.register(meRoutes);
  app.register(mobileRoutes);
  app.register(contactRoutes);
  app.register(soundRoutes);
  app.register(ringGroupRoutes);
  app.register(queueRoutes);
  app.register(conferenceRoutes);
  app.register(pagingRoutes);
  app.register(mohRoutes);
  app.register(deviceRoutes);
  app.register(provisioningRoutes);
  app.register(ivrRoutes);
  app.register(timeConditionRoutes);
  app.register(announcementRoutes);
  app.register(blockedRoutes);
  app.register(callRoutes);
  app.register(recordingRoutes);
  app.register(liveCallRoutes);
  app.register(integrationRoutes);
  app.register(reportRoutes);
  app.register(aboutRoutes);

  // Always registered: reply.sendFile also streams voicemail audio (with Range) from the spool.
  app.register(fastifyStatic, {
    root: publicDir,
    serve: existsSync(publicDir),
    wildcard: false,
  });
  app.setNotFoundHandler((req, reply) => {
    if (existsSync(publicDir) && req.method === 'GET' && !NON_SPA.test(req.url))
      return reply.sendFile('index.html');
    return sendError(reply, notFound());
  });
  return app;
}