export interface Staff {
  id: string;
  name: string;
  active: boolean;
}

export type BusinessStatus = 'ACTIVE' | 'SOLD' | 'INACTIVE';

export interface BusinessListItem {
  id: string;
  name: string;
  status: BusinessStatus;
}

export interface BusinessList {
  businesses: BusinessListItem[];
  counts: Record<BusinessStatus, number>;
}

export interface Business {
  id: string;
  name: string;
  nas_path: string;
  status: BusinessStatus;
}

export interface BusinessFile {
  /** Relative to the business directory, posix separators. */
  path: string;
  size: number;
  mtime: string;
}

export interface ScanResult {
  scanned: number;
  inserted: number;
  updated: number;
  missing: number;
}

// ------------------------------------------------------------ Buyer side
export type BuyerStatus = 'ACTIVE' | 'DEACTIVATED' | 'LEGACY';
export type NdaStatus = 'SENT' | 'SIGNED';
export type DealStatus = 'NEW' | 'INFO_SENT' | 'DUE_DILIGENCE' | 'LOI' | 'CLOSING' | 'ENDED';

/** Calendar day as 'YYYY-MM-DD' — the API never sends date columns as instants. */
export type Day = string;

export interface PrimaryContact {
  name: string;
  email: string | null;
  phone: string | null;
}

export interface BuyerListItem {
  id: string;
  company_name: string | null;
  status: BuyerStatus;
  primary_contact: PrimaryContact | null;
  nda_count: number;
  open_deal_count: number;
}

export interface BuyerList {
  buyers: BuyerListItem[];
  counts: Record<BuyerStatus, number>;
}

export interface DuplicateCandidate {
  buyer_id: string;
  company_name: string | null;
  buyer_status: BuyerStatus;
  /** Any of 'email' | 'name' | 'phone' — a buyer can match on several at once. */
  matched_on: string[];
  contact_name: string;
  contact_email: string | null;
  nda_count: number;
  last_date: Day | null;
}

export interface Contact {
  id: string;
  name: string;
  email: string | null;
  phone: string | null;
  cell: string | null;
  is_primary: boolean;
}

export interface Deal {
  id: string;
  status: DealStatus;
  follow_up_at: Day | null;
  note_count: number;
  business: { id: string; name: string; status: BusinessStatus };
}

export interface NdaRound {
  id: string;
  status: NdaStatus;
  nas_path: string | null;
  sent_at: Day | null;
  signed_at: Day | null;
  intro_date: Day | null;
  preferred_businesses_text: string | null;
  total_purchase_price: string | null;
  down_payment: string | null;
  deals: Deal[];
}

export interface Buyer {
  id: string;
  company_name: string | null;
  status: BuyerStatus;
  address: string | null;
  state: string | null;
  background_experience: string | null;
  how_heard: string | null;
  /** null = not answered on the intake sheet, distinct from an explicit false. */
  interested_in_updates: boolean | null;
  contacts: Contact[];
  ndas: NdaRound[];
  /** Only present on the PATCH response. */
  open_deal_count?: number;
}

export interface DealNote {
  id: string;
  text: string;
  highlight: boolean;
  created_at: string;
  author: string | null;
}

export interface BusinessDeal {
  id: string;
  status: DealStatus;
  buyer_id: string;
  company_name: string | null;
  buyer_status: BuyerStatus;
  contact_name: string | null;
  intro_date: Day | null;
  signed_at: Day | null;
  created_at: string;
}

export interface InquiryInput {
  buyer_id?: string;
  company_name?: string;
  contact: { name: string; email?: string; phone?: string; cell?: string };
  business_id: string;
  backfill?: {
    deal_status: DealStatus;
    nda_status: NdaStatus;
    signed_at?: string;
    nda_nas_path?: string;
  };
}

export interface InquiryResult {
  buyer_id: string;
  nda_id: string;
  deal_id: string;
  created: { buyer: boolean; contact: boolean };
}

export class ApiError extends Error {
  constructor(readonly status: number, message: string) {
    super(message);
  }
}

async function request<T>(path: string, init?: RequestInit): Promise<T> {
  const res = await fetch(path, { credentials: 'same-origin', ...init });
  if (!res.ok) {
    const body = (await res.json().catch(() => null)) as { error?: string } | null;
    throw new ApiError(res.status, body?.error ?? `Request failed (${res.status})`);
  }
  return (await res.json()) as T;
}

function send<T>(method: 'POST' | 'PATCH', path: string, body?: unknown): Promise<T> {
  return request<T>(path, {
    method,
    headers: { 'content-type': 'application/json' },
    body: JSON.stringify(body ?? {}),
  });
}

const post = <T>(path: string, body?: unknown) => send<T>('POST', path, body);
const patch = <T>(path: string, body: unknown) => send<T>('PATCH', path, body);

const qs = (params: Record<string, string>) =>
  new URLSearchParams(params).toString();

export const api = {
  me: () => request<Staff>('/api/me'),
  staff: () => request<Staff[]>('/api/staff'),
  login: (staffId: string) => post<{ ok: boolean; staff: Staff }>('/api/login', { staff_id: staffId }),
  logout: () => post<{ ok: boolean }>('/api/logout'),
  businesses: (status: BusinessStatus | '', search: string) =>
    request<BusinessList>(`/api/businesses?${qs({ status, search })}`),
  business: (id: string) => request<Business>(`/api/businesses/${id}`),
  businessFiles: (id: string) => request<BusinessFile[]>(`/api/businesses/${id}/files`),
  businessDeals: (id: string) => request<BusinessDeal[]>(`/api/businesses/${id}/deals`),
  scan: () => post<ScanResult>('/api/businesses/scan'),

  buyers: (status: BuyerStatus | '', search: string) =>
    request<BuyerList>(`/api/buyers?${qs({ status, search })}`),
  buyer: (id: string) => request<Buyer>(`/api/buyers/${id}`),
  updateBuyer: (id: string, body: Record<string, unknown>) =>
    patch<Buyer>(`/api/buyers/${id}`, body),
  duplicates: (probe: { email?: string; name?: string; phone?: string }) =>
    request<{ candidates: DuplicateCandidate[] }>(
      `/api/buyers/duplicates?${qs({
        email: probe.email ?? '',
        name: probe.name ?? '',
        phone: probe.phone ?? '',
      })}`,
    ),
  createInquiry: (body: InquiryInput) => post<InquiryResult>('/api/inquiries', body),
  addContact: (buyerId: string, body: Record<string, unknown>) =>
    post<Contact>(`/api/buyers/${buyerId}/contacts`, body),
  updateContact: (id: string, body: Record<string, unknown>) =>
    patch<Contact>(`/api/contacts/${id}`, body),
  updateNda: (id: string, body: Record<string, unknown>) =>
    patch<NdaRound>(`/api/ndas/${id}`, body),
  addDeal: (ndaId: string, businessId: string) =>
    post<Deal>(`/api/ndas/${ndaId}/deals`, { business_id: businessId }),
  setDealStatus: (id: string, status: DealStatus, comment?: string) =>
    post<{ id: string; status: DealStatus; follow_up_at: Day | null }>(
      `/api/deals/${id}/status`,
      { status, comment },
    ),
  dealNotes: (id: string) => request<DealNote[]>(`/api/deals/${id}/notes`),
};

/** Same-origin streaming URL of one file inside a business directory. */
export function businessFileUrl(id: string, filePath: string): string {
  return `/api/businesses/${id}/file?path=${encodeURIComponent(filePath)}`;
}

/** The standalone (unbundled) pdf.js viewer page, pointed at a business file. */
export function viewerUrl(id: string, filePath: string): string {
  return `/viewer/index.html?file=${encodeURIComponent(businessFileUrl(id, filePath))}`;
}