// Réglages exposés à l'UI (onglet Réglages). Frontière de sécurité CENTRALE : la table `settings`
// contient aussi des SECRETS (server_secret, vapid_private). Ces routes n'exposent QUE des champs
// non sensibles et n'écrivent QUE des clés explicitement allow-listées — jamais les secrets.
import type { FastifyInstance } from 'fastify';
import type { ServerInfo, SettingsResponse, UpdateSettingsRequest } from '@arboretum/shared';
import type { Config } from '../config.js';
import { type Db, getSetting, setSetting } from '../db/index.js';
import type { PushService } from '../core/push-service.js';
import {
  SCAN_INTERVAL_KEY,
  SCAN_ROOTS_KEY,
  normalizeScanIntervalMin,
  normalizeScanRoots,
  readScanIntervalMin,
  readScanRoots,
} from '../core/scan-settings.js';

// Clés de `settings` modifiables via l'API (allow-list stricte). Les secrets ne figurent JAMAIS ici.
const GITEA_URL_KEY = 'gitea_url';

/** Valide/normalise une URL Gitea : http(s) uniquement (anti-XSS sur le href de l'icône). */
function normalizeGiteaUrl(raw: string): string | null {
  const trimmed = raw.trim();
  if (trimmed === '') return null;
  let url: URL;
  try {
    url = new URL(trimmed);
  } catch {
    return null;
  }
  if (url.protocol !== 'http:' && url.protocol !== 'https:') return null;
  return url.toString();
}

export function registerSettingsRoutes(
  app: FastifyInstance,
  db: Db,
  config: Config,
  serverVersion: string,
  push: PushService,
): void {
  // '' (effacé) est normalisé en null côté réponse.
  const readGiteaUrl = (): string | null => getSetting(db, GITEA_URL_KEY) || null;
  const serverInfo = (): ServerInfo => ({
    version: serverVersion,
    port: config.port,
    bind: config.bind,
    allowedOrigins: config.allowedOrigins,
    dataDir: config.dataDir,
    vapidPublicKey: push.publicKey() || null,
    vapidContact: config.vapidContact,
  });
  const snapshot = (): SettingsResponse => ({
    settings: {
      giteaUrl: readGiteaUrl(),
      scanRoots: readScanRoots(db),
      scanIntervalMin: readScanIntervalMin(db),
    },
    server: serverInfo(),
  });

  app.get('/api/v1/settings', async (): Promise<SettingsResponse> => snapshot());

  app.patch('/api/v1/settings', async (req, reply) => {
    const body = (req.body as Partial<UpdateSettingsRequest> | null) ?? {};
    if ('giteaUrl' in body) {
      const v = body.giteaUrl;
      if (v === null || v === '') {
        setSetting(db, GITEA_URL_KEY, ''); // effacement
      } else if (typeof v === 'string') {
        const normalized = normalizeGiteaUrl(v);
        if (!normalized) {
          return reply.status(400).send({ error: { code: 'BAD_REQUEST', message: 'giteaUrl must be a valid http(s) URL' } });
        }
        setSetting(db, GITEA_URL_KEY, normalized);
      } else {
        return reply.status(400).send({ error: { code: 'BAD_REQUEST', message: 'giteaUrl must be a string or null' } });
      }
    }
    if ('scanRoots' in body) {
      const roots = normalizeScanRoots(body.scanRoots);
      if (!roots) {
        return reply.status(400).send({ error: { code: 'BAD_REQUEST', message: 'scanRoots must be an array of ≤16 absolute, normalized paths (never "/")' } });
      }
      setSetting(db, SCAN_ROOTS_KEY, JSON.stringify(roots));
    }
    if ('scanIntervalMin' in body) {
      const interval = normalizeScanIntervalMin(body.scanIntervalMin);
      if (interval === null) {
        return reply.status(400).send({ error: { code: 'BAD_REQUEST', message: 'scanIntervalMin must be an integer between 0 and 1440' } });
      }
      setSetting(db, SCAN_INTERVAL_KEY, String(interval));
    }
    return reply.send(snapshot());
  });
}