import type { IncomingMessage, ServerResponse } from 'node:http';

import type { GatewayAutoService } from '../../features/routing/index.js';
import { HarborError } from '../../../shared/errors.js';
import { sendJson } from '../response.js';

interface GatewayAutoRouteDependencies {
  appMode: string;
  gatewayAuto: Pick<GatewayAutoService, 'setEnabled'>;
  readBody(req: IncomingMessage): Promise<Record<string, unknown>>;
  withOperation<T>(kind: string, operation: () => Promise<T>): Promise<T>;
  readStatePayload(): Promise<Record<string, unknown> & { gatewayAuto?: unknown }>;
}

export function createGatewayAutoRoute(dependencies: GatewayAutoRouteDependencies) {
  return {
    async handle(req: IncomingMessage, res: ServerResponse) {
      if (req.method !== 'POST' || req.url !== '/api/gateway-auto') return false;
      if (dependencies.appMode !== 'client') throw new HarborError('REQUEST_INVALID');
      const { enabled } = await dependencies.readBody(req);
      if (typeof enabled !== 'boolean') throw new HarborError('REQUEST_INVALID');

      await dependencies.withOperation(
        'gateway-auto',
        () => dependencies.gatewayAuto.setEnabled(enabled),
      );
      const state = await dependencies.readStatePayload();
      sendJson(res, 200, { success: true, gatewayAuto: state.gatewayAuto, state });
      return true;
    },
  };
}