import {
  AccessAction,
  AccessRecord,
  ApiResponse,
  BlacklistCreate,
  BlacklistItem,
  ChangePasswordRequest,
  CurrentUser,
  ExcelImportResult,
  InsideVisitor,
  LoginRequest,
  StatsSummary,
  PublicPass,
  VisitRequestCreate,
  VisitRequestView,
  Zone,
} from './types';

const BASE = '/api';

/** Endpoints whose 401 must NOT trigger a redirect (login probe / public pages). */
const NO_REDIRECT_ON_401 = ['/auth/me', '/auth/login', '/auth/logout', '/public/'];

async function request<T>(path: string, init?: RequestInit): Promise<T> {
  const res = await fetch(`${BASE}${path}`, {
    credentials: 'include',
    ...init,
  });
  // Session expired / not authenticated on a protected call → send to login.
  if (
    res.status === 401 &&
    !NO_REDIRECT_ON_401.some((p) => path.startsWith(p)) &&
    typeof window !== 'undefined' &&
    !['/login', '/kiosk'].includes(window.location.pathname) &&
    !window.location.pathname.startsWith('/pass/')
  ) {
    window.location.assign('/login');
  }
  let body: ApiResponse<T> | null = null;
  try {
    body = (await res.json()) as ApiResponse<T>;
  } catch {
    // non-JSON (shouldn't happen with our envelope)
  }
  if (!res.ok || !body) {
    throw new Error(body?.message || `HTTP ${res.status}`);
  }
  return body.data as T;
}

function jsonInit(method: string, payload: unknown): RequestInit {
  return {
    method,
    headers: { 'Content-Type': 'application/json' },
    body: JSON.stringify(payload),
  };
}

// ===== Auth =====
export const login = (req: LoginRequest) =>
  request<CurrentUser>('/auth/login', jsonInit('POST', req));

export const logout = () =>
  request<string>('/auth/logout', { method: 'POST' });

export const getCurrentUser = () => request<CurrentUser>('/auth/me');

export const changePassword = (req: ChangePasswordRequest) =>
  request<string>('/auth/change-password', jsonInit('POST', req));

// ===== Zones =====
export const listZones = () => request<Zone[]>('/zones');

// ===== Visit requests =====
export const listVisitRequests = () =>
  request<VisitRequestView[]>('/visit-requests');

export const listPendingRequests = () =>
  request<VisitRequestView[]>('/visit-requests/pending');

export const getVisitRequest = (id: number) =>
  request<VisitRequestView>(`/visit-requests/${id}`);

export const createVisitRequest = (req: VisitRequestCreate) =>
  request<VisitRequestView>('/visit-requests', jsonInit('POST', req));

export const cancelVisitRequest = (id: number) =>
  request<VisitRequestView>(`/visit-requests/${id}/cancel`, { method: 'POST' });

export const uploadVisitRequests = (file: File) => {
  const form = new FormData();
  form.append('file', file);
  return request<ExcelImportResult>('/visit-requests/upload', {
    method: 'POST',
    body: form,
  });
};

// ===== Approvals =====
export const approveRequest = (id: number, comment?: string) =>
  request<VisitRequestView>(`/approvals/${id}/approve`, jsonInit('POST', { comment }));

export const rejectRequest = (id: number, comment?: string) =>
  request<VisitRequestView>(`/approvals/${id}/reject`, jsonInit('POST', { comment }));

// ===== Access console (check-in / out, currently inside) =====
export const searchApprovedForCheckIn = (q: string) =>
  request<VisitRequestView[]>(`/access/search?q=${encodeURIComponent(q)}`);

export const checkIn = (payload: { qrToken?: string; visitRequestId?: number; gateId?: string }) =>
  request<AccessAction>('/access/check-in', jsonInit('POST', payload));

export const checkOut = (payload: { qrToken?: string; visitRequestId?: number; gateId?: string }) =>
  request<AccessAction>('/access/check-out', jsonInit('POST', payload));

export const listInside = () => request<InsideVisitor[]>('/access/inside');
export const listTodayAccess = () => request<AccessRecord[]>('/access/today');

// ===== Passes / badge =====
export const getPass = (id: number) => request<VisitRequestView>(`/passes/${id}`);
export const passQrUrl = (id: number) => `/api/passes/${id}/qr.png`;

// ===== Public pass + self-service kiosk (no login, token-based) =====
export const getPublicPass = (token: string) => request<PublicPass>(`/public/passes/${token}`);
export const publicPassQrUrl = (token: string) => `/api/public/passes/${token}/qr.png`;
export const publicCheckIn = (token: string) =>
  request<AccessAction>(`/public/passes/${token}/check-in`, { method: 'POST' });
export const publicCheckOut = (token: string) =>
  request<AccessAction>(`/public/passes/${token}/check-out`, { method: 'POST' });

// ===== Stats =====
export const getStatsSummary = () => request<StatsSummary>('/stats/summary');

// ===== Blacklist (ADMIN) =====
export const listBlacklist = () => request<BlacklistItem[]>('/blacklist');
export const addBlacklist = (req: BlacklistCreate) =>
  request<BlacklistItem>('/blacklist', jsonInit('POST', req));
export const deleteBlacklist = (id: number) =>
  request<string>(`/blacklist/${id}`, { method: 'DELETE' });

// ===== Reports =====
export const reportDownloadUrl = (from: string, to: string) =>
  `/api/reports/visits.xlsx?from=${from}&to=${to}`;