shinkan-jinkendo/frontend/src/api/client.js

/**
 * HTTP-Client: Token, Mandanten-Header, Fehler-Mapping.
 * Alle API-Aufrufe laufen über request() — siehe utils/api.js (Facade) und Domänenmodule (planning.js, exercises.js).
 */

export const API_URL = import.meta.env.VITE_API_URL || ''

/** LocalStorage + Request-Header für Mandanten-Kontext */
export const ACTIVE_CLUB_STORAGE_KEY = 'shinkan_active_club_id'

export function mergeActiveClubHeader(headers = {}) {
  const cid = localStorage.getItem(ACTIVE_CLUB_STORAGE_KEY)
  if (cid && /^\d+$/.test(String(cid).trim())) {
    return { ...headers, 'X-Active-Club-Id': String(cid).trim() }
  }
  return headers
}

async function _fetchWithAuth(endpoint, options = {}) {
  const token = localStorage.getItem('authToken')
  const method = (options.method || 'GET').toUpperCase()

  const headers = mergeActiveClubHeader({
    ...options.headers,
  })
  if (method !== 'GET' && method !== 'HEAD') {
    if (!headers['Content-Type'] && !headers['content-type']) {
      headers['Content-Type'] = 'application/json'
    }
  }

  if (token) {
    headers['X-Auth-Token'] = token
  }

  const url = `${API_URL}${endpoint}`

  try {
    const response = await fetch(url, {
      ...options,
      headers,
    })

    if (!response.ok) {
      const text = await response.text()
      let parsed = null
      try {
        parsed = JSON.parse(text)
      } catch {
        parsed = null
      }
      if (parsed?.detail != null) {
        const d = parsed.detail
        throw new Error(typeof d === 'string' ? d : JSON.stringify(d))
      }
      if (response.status === 502) {
        throw new Error(
          'HTTP 502 (Bad Gateway): Der Reverse-Proxy hat die API nicht korrekt erreicht. Ist `shinkan-api` aktiv (`docker compose ps`, `docker logs shinkan-api`)? Bei Host-Routing nur einen Weg verwenden — alles auf Port 3003 (Nginx nach `backend:8000`) oder sauber `/api` → Backend-Port.'
        )
      }
      const snippet = (text || '').replace(/\s+/g, ' ').trim().slice(0, 180)
      throw new Error(snippet ? `HTTP ${response.status}: ${snippet}` : `HTTP ${response.status}`)
    }

    return response
  } catch (e) {
    if (e instanceof TypeError && (e.message === 'Failed to fetch' || e.message.includes('fetch'))) {
      const hint =
        API_URL && API_URL.length > 0
          ? `Verbindung zum API unter ${API_URL} fehlgeschlagen. Läuft das Backend (z. B. Port 8098) und ist CORS erlaubt?`
          : 'Kein VITE_API_URL gesetzt: Anfragen gehen an die Frontend-URL und schlagen oft fehl. Setze in .env z. B. VITE_API_URL=http://localhost:8098 und starte Vite neu.'
      throw new Error(`${hint} [Technisch: ${e.message}; URL war ${endpoint}]`)
    }
    throw e
  }
}

/**
 * Generischer API-Aufruf inkl. X-Auth-Token und X-Active-Club-Id.
 */
export async function request(endpoint, options = {}) {
  const response = await _fetchWithAuth(endpoint, options)
  return response.json()
}

/** Text-Download (z. B. CSV-Export) mit gleicher Auth wie request(). */
export async function requestText(endpoint, options = {}) {
  const response = await _fetchWithAuth(endpoint, options)
  const disposition = response.headers.get('Content-Disposition') || ''
  const match = disposition.match(/filename="([^"]+)"/)
  return {
    text: await response.text(),
    filename: match ? match[1] : null,
  }
}