import { Prisma } from '@prisma/client';
import { JalaliDate } from '../jalali';

/**
 * One accounting software (D27). AccountingSyncService picks a driver by the
 * admin's switch and owns everything around the call — links, outbox, retries,
 * logging — so a driver only translates between the app's shapes and its
 * software's API.
 *
 * Every figure a driver returns is ALREADY in the app's convention:
 *   * gold in grams of 750, positive balance = the customer owes;
 *   * rial in rial, positive balance = the customer owes.
 * Each software's own sign and unit quirks stay inside its driver.
 */

export type ProviderName = 'tahesab' | 'zarrin';

/** Decrypted connection settings, handed to every call. */
export interface ProviderSettings {
  baseUrl: string;
  token: string;
  caCert: string | null;
  timeoutMs: number;
  /** Tahesab only: the `DBname` header (`TahesabDB` for SQL Server, `DB` for Access). */
  dbName?: string;
  /** Zarrin only, until verified on a real installation (plan §9). */
  balanceOwesWhen?: 'negative' | 'positive';
}

export interface ExternalGroup {
  id: string;
  name: string;
}

export interface ExternalCustomer {
  code: string;
  name: string;
  /** Normalised to 09xxxxxxxxx, or null when the account has no usable mobile. */
  mobile: string | null;
  phone: string | null;
  nationalCode: string | null;
  address: string | null;
  groupId: string | null;
  groupName: string | null;
}

export interface CustomerPayload {
  firstName: string;
  lastName: string;
  fullName: string;
  mobile: string;
  phone: string | null;
  address: string | null;
  nationalCode: string | null;
  group: { id: string | null; name: string | null };
}

export interface ExternalBalance {
  code: string;
  goldGrams: Prisma.Decimal;
  rial: Prisma.Decimal;
}

export interface StatementQuery {
  code: string;
  from: JalaliDate;
  to: JalaliDate;
}

/** One line of a customer's statement, normalised across providers. */
export interface StatementRow {
  /** Stable within the provider (Tahesab ID + Radif, Zarrin idRadif). */
  key: string;
  /** The document the line belongs to — what a detail lookup is keyed on. */
  documentRef: string;
  /** The account the line belongs to, for the SEC-16 ownership check. */
  accountCode: string;
  documentNo: string;
  /** Jalali `1405/07/12`. */
  date: string;
  time: string | null;
  title: string;
  description: string | null;
  itemName: string | null;
  weight: Prisma.Decimal | null;
  karat: number | null;
  count: Prisma.Decimal | null;
  unitPrice: Prisma.Decimal | null;
  wagePercent: Prisma.Decimal | null;
  /** 750-equivalent gold received from the customer (reduces what they owe). */
  goldIn: Prisma.Decimal;
  goldOut: Prisma.Decimal;
  rialIn: Prisma.Decimal;
  rialOut: Prisma.Decimal;
  /** Running balance after this line, when the software reports one. */
  goldBalance: Prisma.Decimal | null;
  rialBalance: Prisma.Decimal | null;
  metal: string | null;
  temporary: boolean;
}

export interface ExternalKarSakhte {
  /** Zarrin idKar; for Tahesab, which has no item ids, the item name itself. */
  code: string;
  name: string;
  groupId: string | null;
  groupName: string | null;
  typeId: string | null;
  typeName: string | null;
  saleWagePercent: Prisma.Decimal | null;
  stockWeight: Prisma.Decimal | null;
  stockCount: Prisma.Decimal | null;
}

export interface KarSakhteStock {
  weight: Prisma.Decimal | null;
  count: Prisma.Decimal | null;
}

export interface MovementRow {
  itemCode: string | null;
  itemName: string;
  date: string;
  description: string | null;
  weight: Prisma.Decimal | null;
  amount: Prisma.Decimal | null;
  count: Prisma.Decimal | null;
}

export interface DocumentLine {
  /** The linked کارساخته: Zarrin idKar / Tahesab Name_Kar. */
  itemCode: string;
  itemName: string;
  /** Physical (raw) weight of the line, all pieces. */
  weightGrams: Prisma.Decimal;
  count: number;
  /** Effective making charge: variant wage minus discount, in percent. */
  wagePercent: Prisma.Decimal;
  /** Flat rial charge of the line (stones), all pieces. */
  flatRial: Prisma.Decimal;
  karat: number;
  description: string;
}

export interface OrderDocumentInput {
  /** Deterministic per order; Tahesab dedupes on it (≥ 20 chars, lowercase). */
  factorCode: string;
  customerCode: string;
  date: Date;
  description: string;
  temporary: boolean;
  lines: DocumentLine[];
}

/** Resumable state of a multi-call document (Zarrin posts one call per line). */
export interface DocumentProgress {
  factorId?: string;
  doneLines?: number;
}

export interface DocumentPostResult {
  ref: string;
  progress: DocumentProgress;
  response: unknown;
}

/** What changed in the accounting software since the last poll (real-time sync). */
export interface ChangeBatch {
  /** Opaque; hand it back on the next poll. */
  cursor: string;
  /** Accounts that got a new or edited document. */
  accountCodes: string[];
  /** کارساخته names that got a new or edited document. */
  itemNames: string[];
  /** More changed than one poll can see: the caller must do a full refresh. */
  overflow: boolean;
}

export interface ProviderCapabilities {
  /** Can a کارساخته be created through the API? (Zarrin yes, Tahesab no.) */
  createKarSakhte: boolean;
  /** Can a posted document be looked up by our own key before a retry? */
  documentInquiry: boolean;
  /** Does the movement report cover every account, or only recent documents? */
  movementScope: 'all' | 'recent-documents';
  /** Can recent changes be polled cheaply (see getChanges)? */
  changeFeed: boolean;
}

export interface AccountingProvider {
  readonly name: ProviderName;
  readonly label: string;
  readonly capabilities: ProviderCapabilities;

  health(s: ProviderSettings): Promise<Record<string, unknown>>;

  listCustomerGroups(s: ProviderSettings): Promise<ExternalGroup[]>;
  /** One page of accounts; `next` is null after the last page. */
  listCustomers(s: ProviderSettings, cursor: string | null): Promise<{ items: ExternalCustomer[]; next: string | null }>;
  findCustomersByMobile(s: ProviderSettings, mobile: string): Promise<ExternalCustomer[]>;
  createCustomer(s: ProviderSettings, p: CustomerPayload): Promise<{ code: string; response: unknown }>;
  updateCustomer(s: ProviderSettings, code: string, p: CustomerPayload): Promise<{ response: unknown }>;

  getBalances(s: ProviderSettings, codes: string[]): Promise<ExternalBalance[]>;
  /**
   * Documents added or edited since `cursor` (null = first poll: only returns
   * the starting cursor). Cheap enough to call every few seconds.
   */
  getChanges(s: ProviderSettings, cursor: string | null): Promise<ChangeBatch>;
  getStatement(s: ProviderSettings, q: StatementQuery): Promise<StatementRow[]>;

  listKarSakhteGroups(s: ProviderSettings): Promise<ExternalGroup[]>;
  listKarSakhteTypes(s: ProviderSettings): Promise<ExternalGroup[]>;
  listKarSakhte(s: ProviderSettings): Promise<ExternalKarSakhte[]>;
  getKarSakhteStock(s: ProviderSettings, item: { code: string; name: string }): Promise<KarSakhteStock>;
  getKarSakhteMovement(s: ProviderSettings, from: JalaliDate, to: JalaliDate): Promise<MovementRow[]>;
  createKarSakhte(
    s: ProviderSettings,
    item: { name: string; groupId: string | null; typeId: string | null },
  ): Promise<{ code: string; response: unknown }>;

  postOrderDocument(
    s: ProviderSettings,
    doc: OrderDocumentInput,
    progress: DocumentProgress,
    onProgress: (p: DocumentProgress) => Promise<void>,
  ): Promise<DocumentPostResult>;
  /** True when a document with this key exists. */
  documentExists(s: ProviderSettings, doc: { factorCode: string; ref: string | null }): Promise<boolean>;
  deleteDocument(
    s: ProviderSettings,
    doc: { factorCode: string; ref: string | null; customerCode: string },
  ): Promise<{ response: unknown }>;
}

/**
 * A call the software answered with an error, or could not be made.
 * `ambiguous` = the software may have acted on it anyway (timeout after send).
 */
export class AccountingProviderError extends Error {
  constructor(
    message: string,
    readonly ambiguous = false,
    readonly response?: unknown,
    readonly notFound = false,
  ) {
    super(message);
    this.name = 'AccountingProviderError';
  }
}

/** Not offered by this software's API. */
export class AccountingNotSupportedError extends AccountingProviderError {
  constructor(what: string) {
    super(`${what} در API این نرم‌افزار وجود ندارد`);
    this.name = 'AccountingNotSupportedError';
  }
}

// ── shared helpers ─────────────────────────────────────────────────────

const PERSIAN_DIGITS = '۰۱۲۳۴۵۶۷۸۹';
const ARABIC_DIGITS = '٠١٢٣٤٥٦٧٨٩';

export function asciiDigits(v: string) {
  return v
    .replace(/[۰-۹]/g, (d) => String(PERSIAN_DIGITS.indexOf(d)))
    .replace(/[٠-٩]/g, (d) => String(ARABIC_DIGITS.indexOf(d)));
}

/**
 * `9121234567`, `09121234567`, `+989121234567`, `00989121234567`, Persian
 * digits → `09121234567`. Anything that is not an Iranian mobile → null.
 */
export function normalizeMobile(v: unknown): string | null {
  if (v === null || v === undefined) return null;
  let d = asciiDigits(String(v)).replace(/\D/g, '');
  if (d.startsWith('0098')) d = d.slice(4);
  else if (d.startsWith('98') && d.length === 12) d = d.slice(2);
  if (d.length === 10 && d.startsWith('9')) d = `0${d}`;
  return /^09\d{9}$/.test(d) ? d : null;
}

/** A Prisma.Decimal from a value the software sent, or null for "null"/blank/NaN. */
export function dec(v: unknown): Prisma.Decimal | null {
  if (v === null || v === undefined) return null;
  const s = asciiDigits(String(v)).replace(/,/g, '').trim();
  if (s === '' || s.toLowerCase() === 'null' || s.toLowerCase() === 'nan') return null;
  try {
    const d = new Prisma.Decimal(s);
    return d.isFinite() ? d : null;
  } catch {
    return null;
  }
}

export const ZERO = new Prisma.Decimal(0);

export function str(v: unknown): string | null {
  if (v === null || v === undefined) return null;
  const s = String(v).trim();
  return s === '' || s.toLowerCase() === 'null' ? null : s;
}

/** Split a full name into first/last the way the app's DB trigger does. */
export function splitName(full: string): { firstName: string; lastName: string } {
  const parts = full.trim().split(/\s+/).filter(Boolean);
  if (parts.length <= 1) return { firstName: parts[0] ?? '', lastName: '' };
  return { firstName: parts[0], lastName: parts.slice(1).join(' ') };
}