import type { ServerResponse } from 'node:http';
import { CodingProjectServiceError } from '../../coding-projects/project-service';
import { CodingConversationServiceError } from '../../coding-runtime/conversation-service';
import { sendJson } from '../route-utils';

export function sendCodingRouteError(res: ServerResponse, error: unknown): void {
  if (error instanceof CodingProjectServiceError || error instanceof CodingConversationServiceError) {
    sendJson(res, error.status, {
      success: false,
      code: error.code,
      error: error.message,
    });
    return;
  }
  if (error instanceof SyntaxError) {
    sendJson(res, 400, {
      success: false,
      code: 'CODING_REQUEST_INVALID',
      error: 'Request JSON is invalid',
    });
    return;
  }
  sendJson(res, 500, {
    success: false,
    code: 'CODING_REQUEST_FAILED',
    error: 'Coding request failed',
  });
}

export function decodeRouteId(value: string): string {
  try {
    const decoded = decodeURIComponent(value).trim();
    if (!decoded || decoded.length > 128 || decoded.includes('/')) throw new Error();
    return decoded;
  } catch {
    throw new CodingConversationServiceError(
      400,
      'CODING_CONVERSATION_REQUEST_INVALID',
      'Route identifier is invalid',
    );
  }
}