const BASE = "/api/public";

export interface PublicBusiness {
  id: number;
  name: string;
  industry: string;
  currency_symbol: string;
  phone: string | null;
  address: string | null;
  booking_enabled: boolean;
  cancel_window_hours: number;
  cancel_penalty_pct: number;
  require_deposit: boolean;
  deposit_pct: number;
}

export interface PublicService {
  id: number;
  name: string;
  description: string | null;
  category: string;
  duration_min: number;
  price: number;
  color: string;
}

export interface PublicEmployee {
  id: number;
  name: string;
  role: string;
  color: string;
}

export interface PublicBusinessResponse {
  business: PublicBusiness;
  services: PublicService[];
  employees: PublicEmployee[];
}

export interface PublicSlot {
  time: string;
  iso: string;
  employee_id: number;
  employee_name: string;
}

export interface PublicSlotsResponse {
  slots: PublicSlot[];
  service: Pick<PublicService, "id" | "name" | "price" | "duration_min">;
}

export interface BookClient {
  name: string;
  email?: string;
  phone?: string;
  notes?: string;
}

export interface BookPayload {
  service_id: number;
  employee_id: number;
  start_at: string;
  client: BookClient;
}

export interface BookResponse {
  appointment: {
    id: number;
    start_at: string;
    price: number;
    service_name: string;
    employee_name: string;
  };
  business: { name: string; currency_symbol: string };
  client_created: boolean;
}

async function request<T>(path: string, init?: RequestInit): Promise<T> {
  const res = await fetch(`${BASE}${path}`, {
    ...init,
    headers: {
      "Content-Type": "application/json",
      ...(init?.headers as Record<string, string> | undefined),
    },
  });
  if (!res.ok) {
    let message = `Error ${res.status}`;
    try {
      const body = await res.json();
      if (body?.error) message = body.error;
    } catch {
      /* ignore */
    }
    throw new Error(message);
  }
  return (await res.json()) as T;
}

export function getBusiness(slug: string): Promise<PublicBusinessResponse> {
  return request<PublicBusinessResponse>(`/${slug}`);
}

export function getSlots(
  slug: string,
  serviceId: number,
  date: string,
  employeeId?: number
): Promise<PublicSlotsResponse> {
  const q = new URLSearchParams({ service_id: String(serviceId), date });
  if (employeeId) q.set("employee_id", String(employeeId));
  return request<PublicSlotsResponse>(`/${slug}/slots?${q.toString()}`);
}

export function book(slug: string, payload: BookPayload): Promise<BookResponse> {
  return request<BookResponse>(`/${slug}/book`, {
    method: "POST",
    body: JSON.stringify(payload),
  });
}