/**
 * API client for the FairRelay Brain backend.
 * All dashboard data comes from real backend endpoints.
 */

const API_BASE = import.meta.env.VITE_API_URL || 'http://localhost:8000';
const API_PREFIX = '/api/v1';

async function fetchJson(path: string, options: RequestInit = {}) {
  const token = localStorage.getItem('fairrelay_token') || '';
  const res = await fetch(`${API_BASE}${path}`, {
    ...options,
    headers: {
      'Content-Type': 'application/json',
      ...(token ? { Authorization: `Bearer ${token}` } : {}),
      ...options.headers,
    },
  });
  if (!res.ok) throw new Error(`API ${res.status}: ${res.statusText}`);
  return res.json();
}

// ═══ Dashboard KPIs ═══
export const getHealth = () => fetchJson('/health');
export const getApiHealth = () => fetchJson(`${API_PREFIX}/health`);

// ═══ Consolidation ═══
export const runConsolidation = (payload: any) =>
  fetchJson(`${API_PREFIX}/consolidate`, { method: 'POST', body: JSON.stringify(payload) });
export const runSimulation = (payload: any) =>
  fetchJson(`${API_PREFIX}/consolidate/simulate`, { method: 'POST', body: JSON.stringify(payload) });

// ═══ Allocation ═══
export const runAllocation = (payload: any) =>
  fetchJson(`${API_PREFIX}/allocate`, { method: 'POST', body: JSON.stringify(payload) });

// ═══ Drivers ═══
export const getDrivers = () => fetchJson(`${API_PREFIX}/drivers`);

// ═══ Routes ═══
export const optimizeRoute = (payload: any) =>
  fetchJson(`${API_PREFIX}/routes/optimize`, { method: 'POST', body: JSON.stringify(payload) });

// ═══ WebSocket ═══
export function connectWS(channel: 'tracking' | 'shipments' | 'dashboard'): WebSocket {
  const wsBase = API_BASE.replace('http', 'ws');
  return new WebSocket(`${wsBase}/ws/${channel}`);
}

// ═══ Ops Backend (Node) ═══
const OPS_BASE = import.meta.env.VITE_OPS_URL || 'http://localhost:3000';

export const getOpsStats = () => fetch(`${OPS_BASE}/api/dashboard/stats`).then(r => r.json());
export const getOpsActivity = () => fetch(`${OPS_BASE}/api/dashboard/activity`).then(r => r.json());
export const getOpsTracking = () => fetch(`${OPS_BASE}/api/dashboard/live-tracking-gps`).then(r => r.json());
export const getOpsShipments = (params?: string) => fetch(`${OPS_BASE}/api/shipments${params ? '?' + params : ''}`).then(r => r.json());