import { computeTotals } from "../../lib/invoice";
import { amountInWords } from "../../lib/numberToWords";
import type { BankAccount, Invoice, InvoiceItem, Settings, TaxType } from "../../lib/types";
import { buildRenderModel, type RenderModel } from "../model/build";
import { DEFAULT_PREFS, type RenderPrefsV1 } from "../model/prefs";

/**
 * Pure data for the Diagnostics self-test and the goldens test (no Node or DOM imports, so the
 * webview and Node build the very same models). Change a fixture and regenerate the goldens.
 */

export interface SelfTestFixture {
  id: string;
  label: string;
  model: RenderModel;
  prefs: RenderPrefsV1;
  invoiceNumber: string;
  /** The grand total as the template prints it, e.g. "₹8,260.00". */
  totalText: string;
}

const VENDOR: Settings = {
  vendorName: "Selftest Studio",
  vendorAddress: "1 Test Lane, Test Town, Bangalore - 560005",
  vendorEmail: "selftest@example.com",
  vendorPhone: "9000000000",
  vendorPan: "AAAAA0000A",
  vendorGstin: "",
  vendorStateCode: "29",
  logoPath: null,
  signaturePath: null,
  defaultBankId: 1,
  defaultTaxRate: 18,
  defaultTaxType: "cgst_sgst",
  paymentTermsDays: 30,
  currency: "INR",
  onboarded: true,
  theme: "g10",
  gstRegistration: "unregistered",
  defaultHsnSac: "",
  signatoryName: "",
  signatoryDesignation: "",
  renderPrefs: "",
};

const BANK: BankAccount = {
  id: 1,
  label: "Primary",
  bankName: "State Bank of India",
  accountName: "Selftest Studio",
  accountNo: "00000000000",
  branch: "000000",
  ifsc: "SBIN0000000",
  isDefault: true,
};

const items = (n: number, hsn: boolean): InvoiceItem[] =>
  Array.from({ length: n }, (_, i) => ({
    id: i + 1,
    description: `Voice-over session ${i + 1} - narration for module ${i + 1}`,
    mode: i % 2 === 0 ? "rate" : "fixed",
    rate: 1200,
    unit: "hour",
    quantity: 1 + (i % 3),
    amount: 2500 + i * 10,
    sortOrder: i,
    ...(hsn ? { hsnSac: "998397" } : {}),
  }));

function build(o: { id: string; label: string; number: string; rows: number; registered: boolean; prefs: Partial<RenderPrefsV1> }): SelfTestFixture {
  const taxType: TaxType = o.registered ? "cgst_sgst" : "none";
  const taxRate = o.registered ? 18 : 0;
  const rows = items(o.rows, o.registered);
  const totals = computeTotals(rows, 0, taxType, taxRate);
  const vendor: Settings = o.registered
    ? { ...VENDOR, vendorGstin: "29AAAAA0000A1Z5", gstRegistration: "regular", signatoryName: "Selftest Studio", signatoryDesignation: "Proprietor" }
    : VENDOR;
  const invoice: Invoice = {
    id: 1,
    number: o.number,
    seriesId: 1,
    invoiceDate: "2026-09-15",
    dueDate: "2026-10-15",
    clientId: null,
    clientName: "Acme Learning Pvt Ltd",
    clientAddress: "42 MG Road\nBangalore 560001",
    clientGstin: o.registered ? "29ABCDE1234F1Z5" : "",
    poNumber: "",
    placeOfSupplyStateCode: o.registered ? "29" : "",
    subtotal: totals.subtotal,
    discount: totals.discount,
    taxType,
    taxRate,
    cgstAmount: totals.cgst,
    sgstAmount: totals.sgst,
    igstAmount: totals.igst,
    total: totals.total,
    amountInWords: amountInWords(totals.total),
    bankAccountId: 1,
    bankSnapshot: "",
    signaturePath: null,
    notes: "",
    status: "issued",
    createdAt: "2026-09-15T00:00:00Z",
    updatedAt: "2026-09-15T00:00:00Z",
    docType: o.registered ? "tax_invoice" : "invoice",
    reverseCharge: false,
    vendorSnapshot: "",
    snapshotOrigin: "",
    cancelledAt: null,
    cancelReason: "",
    archivedPdfSha256: null,
    renderPrefs: "",
    items: rows,
  };
  const model = buildRenderModel({ invoice, vendor, bank: BANK, logo: null, signatureDataUri: null, appVersion: "0.0.0-selftest" });
  return {
    id: o.id,
    label: o.label,
    model,
    prefs: { ...DEFAULT_PREFS, ...o.prefs },
    invoiceNumber: o.number,
    totalText: model.totals.totalText,
  };
}

export const SELF_TEST_FIXTURE_IDS = ["classic-a4-tax-3", "classic-letter-unreg-60"] as const;

/** Classic A4 tax invoice with 3 rows, and Classic Letter plain invoice with 60 rows (a multi-page table). */
export function selfTestFixtures(): SelfTestFixture[] {
  return [
    build({ id: "classic-a4-tax-3", label: "Classic, A4, tax invoice, 3 rows", number: "ST/2026-001", rows: 3, registered: true, prefs: { pageSize: "A4" } }),
    build({ id: "classic-letter-unreg-60", label: "Classic, Letter, unregistered, 60 rows", number: "ST/2026-002", rows: 60, registered: false, prefs: { pageSize: "LETTER" } }),
  ];
}