/**
 * All HTTP goes through this module (spec §8.2 rule 1).
 * No raw fetch() in components. Shapes mirror backend schemas.py (spec §8.3 rule 1).
 */

const BASE_URL = '' // same origin; Vite dev server proxies /api to the backend

async function request(path, options = {}) {
  const resp = await fetch(`${BASE_URL}${path}`, {
    headers: { 'Content-Type': 'application/json' },
    ...options,
  })
  if (!resp.ok) {
    // Try to extract backend error detail for a better message
    let detail = `${resp.status}`
    try {
      const body = await resp.json()
      if (body.detail) detail = body.detail
    } catch { /* can't parse — use status code */ }
    throw new Error(`API ${options.method ?? 'GET'} ${path} failed: ${detail}`)
  }
  // 204 No Content (DELETE) — return success indicator
  if (resp.status === 204) return { ok: true }
  return resp.json()
}

export const api = {
  health: () => request('/api/health'),
  // Foods (spec §3.1)
  searchFoods: (q) => request(`/api/foods?q=${encodeURIComponent(q)}`),
  recentFoods: (limit = 10) => request(`/api/foods/recent?limit=${limit}`),
  getFood: (id) => request(`/api/foods/${id}`),
  createFood: (food) => request('/api/foods', { method: 'POST', body: JSON.stringify(food) }),
  // Daily log (spec §3.3) — dates are YYYY-MM-DD strings end-to-end (spec §8.3 rule 4)
  getLog: (date) => request(`/api/log?date=${date}`),
  addLogEntry: (entry) => request('/api/log', { method: 'POST', body: JSON.stringify(entry) }),
  updateLogEntry: (id, data) => request(`/api/log/${id}`, { method: 'PUT', body: JSON.stringify(data) }),
  deleteLogEntry: (id) => request(`/api/log/${id}`, { method: 'DELETE' }),
  getSummary: (date) => request(`/api/log/summary?date=${date}`),
  // Targets (spec §3.4)
  getCurrentTarget: () => request('/api/targets/current'),
  getTargets: () => request('/api/targets'),
  createTarget: (target) => request('/api/targets', { method: 'POST', body: JSON.stringify(target) }),
  // OFF proxy (spec §3.5) — the frontend never calls OFF directly
  offProduct: (barcode) => request(`/api/off/product/${barcode}`),
  offSearch: (q) => request(`/api/off/search?q=${encodeURIComponent(q)}`),
}