import { redirectToLogin } from './auth.js';

export class ApiError extends Error {
  constructor(public status: number, public code: string, public details?: unknown) {
    super(`${status} ${code}`);
  }

  /** Удобочитаемое сообщение для UI: разворачивает zod issues если есть. */
  prettyMessage(): string {
    if (this.code === 'validation_error' && this.details && typeof this.details === 'object') {
      const d = this.details as { issues?: { fieldErrors?: Record<string, string[]> } };
      const fields = d.issues?.fieldErrors;
      if (fields) {
        const parts = Object.entries(fields)
          .filter(([, msgs]) => msgs && msgs.length > 0)
          .map(([k, msgs]) => `${k}: ${msgs!.join(', ')}`);
        if (parts.length) return `Ошибка в полях: ${parts.join('; ')}`;
      }
    }
    return `${this.code} (HTTP ${this.status})`;
  }
}

async function request<T>(method: string, path: string, body?: unknown): Promise<T> {
  const init: RequestInit = { method, credentials: 'include' };
  if (body !== undefined) {
    init.headers = { 'Content-Type': 'application/json' };
    init.body = JSON.stringify(body);
  }
  const res = await fetch(path, init);
  if (res.status === 401) {
    redirectToLogin();
  }
  if (res.status === 204) return undefined as T;
  const text = await res.text();
  const data = text ? JSON.parse(text) : undefined;
  if (!res.ok) {
    throw new ApiError(res.status, (data as { error?: string })?.error ?? 'http_error', data);
  }
  return data as T;
}

export const api = {
  get: <T>(p: string) => request<T>('GET', p),
  post: <T>(p: string, body: unknown) => request<T>('POST', p, body),
  put: <T>(p: string, body: unknown) => request<T>('PUT', p, body),
  del: <T = void>(p: string) => request<T>('DELETE', p),
};

export type Organization = {
  id: string;
  name: string;
  inn: string;
  kpp: string | null;
  ogrn: string | null;
  legalAddress: string | null;
  bankName: string | null;
  bankBik: string | null;
  bankAccount: string | null;
  signatoryName: string | null;
  signatoryPosition: string | null;
};

export type Client = {
  id: string;
  organizationId: string;
  kind: 'ul' | 'ip' | 'fl';
  name: string;
  inn: string | null;
  kpp: string | null;
  address: string | null;
  email: string | null;
  phone: string | null;
  contactPerson: string | null;
  requisitesJson: Record<string, unknown> | null;
  createdAt: string;
  updatedAt: string;
};

export type Service = {
  id: string;
  organizationId: string;
  name: string;
  unit: string;
  defaultPriceCents: number; // BigInt сериализуется в number (см. apps/api/src/lib/bigint.ts)
  defaultVat: VatRate;
  notes: string | null;
  archivedAt: string | null;
};

export type VatRate = 'none' | 'vat_0' | 'vat_5' | 'vat_7' | 'vat_10' | 'vat_20';
export type DocType = 'contract' | 'invoice' | 'act' | 'upd';
export type DocStatus = 'draft' | 'issued' | 'sent' | 'partially_paid' | 'paid' | 'cancelled' | 'signed';

export type DocumentLine = {
  id: string;
  documentId: string;
  position: number;
  serviceId: string | null;
  name: string;
  qtyMilli: number;
  unit: string;
  priceCents: number;
  vat: VatRate;
  sumCents: number;
};

export type DocumentSummary = {
  id: string;
  organizationId: string;
  docType: DocType;
  number: string;
  issuedAt: string | null;
  status: DocStatus;
  clientId: string | null;
  client: { id: string; name: string; kind: Client['kind'] } | null;
  parentDocumentId: string | null;
  totalCents: number;
  vatCents: number;
  currency: string;
  tochkaDocumentId: string | null;
  pdfPath: string | null;
  createdAt: string;
  updatedAt: string;
};

export type Document = DocumentSummary & {
  body: DocBody;
  client: Client | null;
  lines: DocumentLine[];
};

export type DocumentTemplate = {
  id: string;
  organizationId: string;
  docType: DocType;
  name: string;
  body: DocBody;
  createdAt: string;
  updatedAt: string;
};

// === Block schema (mirrors packages/shared) ===

export type RichText = {
  type: string;
  content?: RichText[];
  text?: string;
  marks?: { type: string }[];
};

export type Block =
  | { id: string; type: 'heading'; level: 1 | 2 | 3; text: RichText }
  | { id: string; type: 'paragraph'; text: RichText }
  | {
      id: string;
      type: 'party';
      role: 'executor' | 'customer';
      bind: { kind: 'self' } | { kind: 'client'; clientId?: string };
    }
  | {
      id: string;
      type: 'services_table';
      columns: Array<'name' | 'qty' | 'unit' | 'price' | 'vat' | 'sum'>;
      lines: { lineId: string }[];
    }
  | { id: string; type: 'totals'; showVat: boolean; showInWords: boolean }
  | { id: string; type: 'terms'; text: RichText }
  | { id: string; type: 'signatures'; sides: ('executor' | 'customer')[] }
  | { id: string; type: 'custom_text'; text: RichText }
  | { id: string; type: 'page_break' };

export type DocBody = {
  version: 1;
  blocks: Block[];
  vars: Record<string, unknown>;
};

export type LineHistoryItem = {
  serviceId: string | null;
  name: string;
  unit: string;
  priceCents: number;
  vat: VatRate;
  lastUsed: string;
  useCount: number;
};