nextjs-app/src/lib/api-response.ts

import { NextResponse } from 'next/server'

/**
 * Standard API response helpers.
 * All API routes should use these for consistent response envelopes.
 *
 * Success: { ok: true, ...data }
 * Error:   { ok: false, error: string, ...extra }
 */

export function apiSuccess<T extends Record<string, unknown>>(
  data: T,
  status = 200
): NextResponse {
  return NextResponse.json({ ok: true, ...data }, { status })
}

export function apiError(
  error: string,
  status = 500,
  extra?: Record<string, unknown>
): NextResponse {
  return NextResponse.json({ ok: false, error, ...extra }, { status })
}

/** Common error responses */
export const ApiErrors = {
  noApiBase: () =>
    apiError('API URL yapılandırılmamış. NEXT_PUBLIC_API_URL tanımlayın.', 500),

  invalidJson: () => apiError('Geçersiz JSON body', 400),

  bodyRequired: () => apiError('JSON body gerekli', 400),

  invalidSymbol: () =>
    apiError('Geçerli bir symbol alanı gerekli (ör: THYAO)', 400),

  upstream: (route: string, status: number, detail?: unknown) =>
    apiError(`Upstream ${route} error: ${status}`, status >= 400 ? status : 502, {
      detail: detail ?? null,
    }),

  timeout: (route: string) =>
    apiError(`${route} isteği zaman aşımına uğradı`, 504),

  unknown: (msg?: string) =>
    apiError(msg || 'Bilinmeyen hata', 502),
} as const