/**
 * Settings Routes – key/value application settings
 */
import type { FastifyInstance } from 'fastify';
import type { DatabaseInterface } from '../database/DatabaseInterface.js';
import { requireAuth } from '../auth/authMiddleware.js';
import type { AuthService } from '../auth/AuthService.js';
import { validateSettingsKey, validateSettingsValue } from '../utils/validation.js';

/** Built-in default settings so the frontend never sees a 404 for known keys. */
const DEFAULT_SETTINGS: Record<string, string> = {
  'cad.unit': 'mm',
  'cad.gridSize': '20',
  'cad.scaleFactor': '1',
};

export function registerSettingsRoutes(fastify: FastifyInstance, db: DatabaseInterface, authService: AuthService) {
  // Get a single setting by key
  fastify.get('/api/settings/:key', async (request, reply) => {
    if (!requireAuth(request, reply, authService)) return;
    const { key } = request.params as { key: string };
    const keyErr = validateSettingsKey(key);
    if (keyErr) return reply.code(400).send({ error: keyErr });
    const setting = db.getSetting(key);
    if (setting) return setting;
    // Return a default value for known CAD settings instead of 404
    if (DEFAULT_SETTINGS[key] !== undefined) {
      return { key, value: DEFAULT_SETTINGS[key], updated_at: new Date().toISOString() };
    }
    return reply.code(404).send({ error: 'Setting not found' });
  });

  // Create or update a setting (upsert)
  fastify.put('/api/settings/:key', async (request, reply) => {
    if (!requireAuth(request, reply, authService)) return;
    const { key } = request.params as { key: string };
    const keyErr = validateSettingsKey(key);
    if (keyErr) return reply.code(400).send({ error: keyErr });
    const body = request.body as { value?: string };
    const valueErr = validateSettingsValue(body.value);
    if (valueErr) return reply.code(400).send({ error: valueErr });
    db.setSetting(key, body.value as string);
    return { key, value: body.value as string, updated_at: new Date().toISOString() };
  });
}