import type {
  SummaryData,
  TypeSummary,
  VehicleListItem,
  DeptGroup,
  RegionGroup,
  CustomerStats,
  RegionalInventoryStats,
} from './types';
import { fetchJson } from '../../auth/api-client';

const BASE = '/api/vehicles';

export interface SubjectOption {
  name: string;
  total: number;
  inventory: number;
  operating: number;
}

function withSubject(path: string, subject?: string | null): string {
  if (!subject) return path;
  const sep = path.includes('?') ? '&' : '?';
  return `${path}${sep}subject=${encodeURIComponent(subject)}`;
}

export async function fetchSubjects(): Promise<SubjectOption[]> {
  return fetchJson<SubjectOption[]>(`${BASE}/subjects`);
}

export async function fetchSummary(subject?: string | null): Promise<SummaryData> {
  return fetchJson<SummaryData>(withSubject(`${BASE}/summary`, subject));
}

export async function fetchByType(subject?: string | null): Promise<TypeSummary[]> {
  return fetchJson<TypeSummary[]>(withSubject(`${BASE}/by-type`, subject));
}

export async function fetchVehicleList(params: {
  batch?: string;
  model?: string;
  location?: string;
  status?: string;
  category?: string;
  vehicleType?: string;
  manager?: string;
  customer?: string;
  isColdChain?: string;
  isTrailer?: string;
  department?: string;
  attendance?: string;
  subject?: string | null;
  source?: string;
}): Promise<VehicleListItem[]> {
  const query = new URLSearchParams();
  if (params.batch) query.set('batch', params.batch);
  if (params.model) query.set('model', params.model);
  if (params.location) query.set('location', params.location);
  if (params.status) query.set('status', params.status);
  if (params.category) query.set('category', params.category);
  if (params.vehicleType) query.set('vehicleType', params.vehicleType);
  if (params.manager) query.set('manager', params.manager);
  if (params.customer) query.set('customer', params.customer);
  if (params.isColdChain) query.set('isColdChain', params.isColdChain);
  if (params.isTrailer) query.set('isTrailer', params.isTrailer);
  if (params.department) query.set('department', params.department);
  if (params.attendance) query.set('attendance', params.attendance);
  if (params.subject) query.set('subject', params.subject);
  if (params.source) query.set('source', params.source);
  return fetchJson<VehicleListItem[]>(`${BASE}/list?${query.toString()}`);
}

export interface WeeklyDetailItem {
  truck_id: number;
  plate_number: string;
  handover_date: string | null;
  contract_type: string | null;
  customer_name: string | null;
}

export async function fetchDeptStats(subject?: string | null): Promise<DeptGroup[]> {
  return fetchJson<DeptGroup[]>(withSubject(`${BASE}/dept-stats`, subject));
}

export async function fetchRegionStats(
  params?: { customer?: string; city?: string; region?: string },
  subject?: string | null,
): Promise<RegionGroup[]> {
  const query = new URLSearchParams();
  if (params?.customer) query.set('customer', params.customer);
  if (params?.city) query.set('city', params.city);
  if (params?.region) query.set('region', params.region);
  if (subject) query.set('subject', subject);
  const qs = query.toString();
  return fetchJson<RegionGroup[]>(`${BASE}/region-stats${qs ? `?${qs}` : ''}`);
}

export async function fetchCustomerStats(subject?: string | null): Promise<CustomerStats[]> {
  return fetchJson<CustomerStats[]>(withSubject(`${BASE}/customer-stats`, subject));
}

export async function fetchInventoryStats(subject?: string | null): Promise<RegionalInventoryStats[]> {
  return fetchJson<RegionalInventoryStats[]>(withSubject(`${BASE}/inventory-stats`, subject));
}

export async function fetchRegionChart(
  groupBy: string,
  top = 8,
  source = 'realtime',
  subject?: string | null,
): Promise<{ name: string; value: number }[]> {
  return fetchJson<{ name: string; value: number }[]>(
    withSubject(`${BASE}/region-chart?groupBy=${groupBy}&top=${top}&source=${source}`, subject),
  );
}

export async function fetchWeeklyDetail(
  type: string,
  filters?: { model?: string; batch?: string; location?: string; source?: string },
): Promise<WeeklyDetailItem[]> {
  const params = new URLSearchParams({ type });
  if (filters?.model && filters.model !== 'All') params.set('model', filters.model);
  if (filters?.batch && filters.batch !== 'All') params.set('batch', filters.batch);
  if (filters?.location && filters.location !== 'All') params.set('location', filters.location);
  if (filters?.source) params.set('source', filters.source);
  return fetchJson<WeeklyDetailItem[]>(`${BASE}/weekly-detail?${params.toString()}`);
}