import type { MonitoringData, TargetSummary, TargetVehicle, TrendPoint } from './types';

const BASE = '/api/mileage';

async function fetchJson<T>(url: string): Promise<T> {
  const res = await fetch(url);
  if (!res.ok) throw new Error(`API error: ${res.status} ${res.statusText}`);
  return res.json();
}

export async function fetchMonitoring(params?: {
  sortBy?: string;
  sortOrder?: string;
  limit?: number;
  page?: number;
  search?: string;
  dept?: string;
  customer?: string;
  project?: string;
  entity?: string;
  plate?: string;
  mileageMin?: string;
  mileageMax?: string;
}): Promise<MonitoringData> {
  const query = new URLSearchParams();
  if (params?.sortBy) query.set('sortBy', params.sortBy);
  if (params?.sortOrder) query.set('sortOrder', params.sortOrder);
  if (params?.limit) query.set('limit', String(params.limit));
  if (params?.page) query.set('page', String(params.page));
  if (params?.search) query.set('search', params.search);
  if (params?.dept) query.set('dept', params.dept);
  if (params?.customer) query.set('customer', params.customer);
  if (params?.project) query.set('project', params.project);
  if (params?.entity) query.set('entity', params.entity);
  if (params?.plate) query.set('plate', params.plate);
  if (params?.mileageMin) query.set('mileageMin', params.mileageMin);
  if (params?.mileageMax) query.set('mileageMax', params.mileageMax);
  const qs = query.toString();
  return fetchJson<MonitoringData>(`${BASE}/monitoring${qs ? `?${qs}` : ''}`);
}

export async function fetchTargets(): Promise<TargetSummary[]> {
  return fetchJson<TargetSummary[]>(`${BASE}/targets`);
}

export async function fetchTargetVehicles(targetId: number): Promise<TargetVehicle[]> {
  return fetchJson<TargetVehicle[]>(`${BASE}/target/${targetId}/vehicles`);
}

export async function fetchTrend(targetId?: number, days = 7): Promise<TrendPoint[]> {
  const params = new URLSearchParams();
  if (targetId) params.set('targetId', String(targetId));
  params.set('days', String(days));
  return fetchJson<TrendPoint[]>(`${BASE}/trend?${params.toString()}`);
}