import { describe, expect, it } from "vitest";
import type { BankAccount, Invoice, InvoiceItem, Settings } from "../../lib/types";
import { buildRenderModel, type BuildInput } from "./build";
import { bankFromSnapshot, vendorFromSnapshot } from "./vendor";

const vendor: Settings = {
  vendorName: "Test Vendor",
  vendorAddress: "13-B Type House,\r\nTest Road,  Test Town\nBangalore - 560005",
  vendorEmail: "Sample@example.com",
  vendorPhone: "9000000000",
  vendorPan: "ABCDE1234F",
  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: "Test Vendor",
  accountNo: "000000000000",
  branch: "000001",
  ifsc: "TEST0000001",
  isDefault: true,
};

const items: InvoiceItem[] = [
  { description: "Voice-over\nsession A", mode: "rate", rate: 1200, unit: "hour", quantity: 2.5, amount: 3000, sortOrder: 0, hsnSac: "998397" },
  { description: "", mode: "fixed", rate: 0, unit: "unit", quantity: 1, amount: 2500.5, sortOrder: 1 },
];

const base: Invoice = {
  id: 1,
  number: "INV-0001",
  seriesId: 1,
  invoiceDate: "2026-09-15",
  dueDate: "2026-10-05",
  clientId: null,
  clientName: "Acme   Pvt Ltd",
  clientAddress: "1 Main Road\r\nMumbai",
  clientGstin: "",
  poNumber: "",
  placeOfSupplyStateCode: "",
  subtotal: 5500.5,
  discount: 0,
  taxType: "none",
  taxRate: 0,
  cgstAmount: 0,
  sgstAmount: 0,
  igstAmount: 0,
  total: 5500.5,
  amountInWords: "Five Thousand Five Hundred Rupees and Fifty Paise Only",
  bankAccountId: 1,
  bankSnapshot: "",
  signaturePath: null,
  notes: "Thanks\r\n\r\nPay in 30 days",
  status: "issued",
  createdAt: "2026-09-15T00:00:00Z",
  updatedAt: "2026-09-15T00:00:00Z",
  docType: "invoice",
  reverseCharge: false,
  vendorSnapshot: "",
  snapshotOrigin: "",
  cancelledAt: null,
  cancelReason: "",
  archivedPdfSha256: null,
  renderPrefs: "",
  items,
};

const make = (over: Partial<Invoice> = {}, v: Partial<Settings> = {}, rest: Partial<BuildInput> = {}) =>
  buildRenderModel({
    invoice: { ...base, ...over },
    vendor: { ...vendor, ...v },
    bank,
    logo: null,
    signatureDataUri: null,
    appVersion: "0.1.0",
    ...rest,
  });

describe("unregistered invoice", () => {
  const m = make();
  it("is a plain Invoice without tax slots", () => {
    expect(m.docTitle).toBe("Invoice");
    expect(m.docType).toBe("invoice");
    expect(m.pdfTitle).toBe("Invoice INV-0001");
    expect(m.slots).toEqual({ gstin: false, clientGstin: false, pos: false, hsn: true, taxRows: false, reverseCharge: false });
    expect(m.totals).toMatchObject({
      subtotalText: "₹5,500.50",
      discountText: null,
      taxableText: null,
      taxRows: [],
      totalText: "₹5,500.50",
    });
    expect(m.supplier.gstin).toBeNull();
    expect(m.supplier.showGstin).toBe(false);
    expect(m.client.posLabel).toBeNull();
    expect(m.cancelled).toBe(false);
    expect(m.reverseCharge).toBeNull();
    expect(m.logo).toBeNull();
  });
  it("formats and sanitises text", () => {
    expect(m.supplier.addressLines).toEqual(["13-B Type House,", "Test Road, Test Town", "Bangalore - 560005"]);
    expect(m.supplier.stateName).toBe("Karnataka");
    expect(m.client.name).toBe("Acme Pvt Ltd");
    expect(m.client.addressLines).toEqual(["1 Main Road", "Mumbai"]);
    expect(m.client.poNumber).toBeNull();
    expect(m.notesLines).toEqual(["Thanks", "Pay in 30 days"]);
    expect(m.meta).toEqual({ numberLabel: "Invoice No.", number: "INV-0001", date: "15 Sept 2026", isoDate: "2026-09-15", dueDate: "05 Oct 2026" });
  });
  it("builds items with rate, quantity and em-dash fallback", () => {
    expect(m.items[0]).toEqual({
      sno: 1,
      descriptionLines: ["Voice-over", "session A"],
      hsnSac: "998397",
      rateText: "₹1,200.00 per hour",
      qtyText: "2.5",
      amountText: "₹3,000.00",
    });
    expect(m.items[1]).toEqual({
      sno: 2,
      descriptionLines: ["—"],
      hsnSac: null,
      rateText: null,
      qtyText: "1",
      amountText: "₹2,500.50",
    });
  });
  it("labels the bank lines and defaults the signature to the vendor name", () => {
    expect(m.bank).toEqual({
      accountName: "Test Vendor",
      lines: [
        { label: "Bank", value: "State Bank of India" },
        { label: "Account No.", value: "000000000000" },
        { label: "Branch", value: "000001" },
        { label: "IFSC", value: "TEST0000001" },
      ],
    });
    expect(m.signature).toEqual({ dataUri: null, name: "Test Vendor", designation: "" });
  });
});

describe("CGST + SGST tax invoice", () => {
  const m = make(
    {
      docType: "tax_invoice",
      taxType: "cgst_sgst",
      taxRate: 5,
      discount: 500.5,
      cgstAmount: 125,
      sgstAmount: 125,
      total: 5250,
      clientGstin: "29ABCDE1234F1Z5",
      placeOfSupplyStateCode: "29",
      poNumber: "PO-77",
      reverseCharge: true,
    },
    { vendorGstin: "29AAAAA0000A1Z5", gstRegistration: "regular", signatoryName: "A. Person", signatoryDesignation: "Proprietor" },
  );
  it("derives labels, rates and slots", () => {
    expect(m.docTitle).toBe("Tax Invoice");
    expect(m.totals.taxRows).toEqual([
      { label: "CGST", rateText: "2.5%", amountText: "₹125.00" },
      { label: "SGST", rateText: "2.5%", amountText: "₹125.00" },
    ]);
    expect(m.totals.discountText).toBe("₹500.50");
    expect(m.totals.taxableText).toBe("₹5,000.00");
    expect(m.totals.totalText).toBe("₹5,250.00");
    expect(m.slots).toEqual({ gstin: true, clientGstin: true, pos: true, hsn: true, taxRows: true, reverseCharge: true });
    expect(m.client.posLabel).toBe("29 – Karnataka");
    expect(m.client.gstin).toBe("29ABCDE1234F1Z5");
    expect(m.client.poNumber).toBe("PO-77");
    expect(m.supplier.showGstin).toBe(true);
    expect(m.reverseCharge).toBe("Tax is payable on reverse charge: Yes");
    expect(m.signature).toMatchObject({ name: "A. Person", designation: "Proprietor" });
  });
});

describe("reverse charge line", () => {
  it("is always present on a tax invoice (Yes or No) and absent on a plain invoice", () => {
    expect(make({ docType: "tax_invoice", reverseCharge: false }).reverseCharge).toBe("Tax is payable on reverse charge: No");
    expect(make({ docType: "tax_invoice", reverseCharge: true }).reverseCharge).toBe("Tax is payable on reverse charge: Yes");
    expect(make({ docType: "invoice", reverseCharge: true }).reverseCharge).toBeNull();
  });
});

describe("IGST", () => {
  const m = make({ docType: "tax_invoice", taxType: "igst", taxRate: 18, igstAmount: 990.09, total: 6490.59, placeOfSupplyStateCode: "27" });
  it("has one IGST row at the full rate", () => {
    expect(m.totals.taxRows).toEqual([{ label: "IGST", rateText: "18%", amountText: "₹990.09" }]);
    expect(m.client.posLabel).toBe("27 – Maharashtra");
  });
});

describe("UTGST supplier states", () => {
  it.each(["04", "26", "31", "35", "38"])("uses UTGST for supplier state %s", (code) => {
    const m = make({ docType: "tax_invoice", taxType: "cgst_sgst", taxRate: 18, cgstAmount: 1, sgstAmount: 1 }, { vendorStateCode: code });
    expect(m.totals.taxRows.map((r) => r.label)).toEqual(["CGST", "UTGST"]);
  });
  it("keeps SGST for ordinary states and Delhi/Puducherry", () => {
    for (const code of ["29", "07", "34", "01"]) {
      const m = make({ docType: "tax_invoice", taxType: "cgst_sgst", taxRate: 18 }, { vendorStateCode: code });
      expect(m.totals.taxRows[1].label).toBe("SGST");
    }
  });
  it("resolves the supplier state name", () => {
    expect(make({}, { vendorStateCode: "04" }).supplier.stateName).toBe("Chandigarh");
  });
});

describe("cancelled and logo", () => {
  it("flags cancelled invoices", () => {
    expect(make({ status: "cancelled" }).cancelled).toBe(true);
    expect(make({ status: "draft" }).cancelled).toBe(false);
  });
  it("passes the logo and signature through, and keeps null when absent", () => {
    const logo = { dataUri: "data:image/png;base64,AA==", width: 200, height: 40 };
    const m = make({}, {}, { logo, signatureDataUri: "data:image/png;base64,BB==" });
    expect(m.logo).toEqual(logo);
    expect(m.signature.dataUri).toBe("data:image/png;base64,BB==");
    expect(make().logo).toBeNull();
  });
});

describe("snapshots", () => {
  it("lets the invoice's vendor snapshot override live settings", () => {
    const snap = JSON.stringify({ vendorName: "Old Name", vendorStateCode: "04", vendorGstin: "04AAAAA0000A1Z5", gstRegistration: "regular" });
    const m = make({ vendorSnapshot: snap, docType: "tax_invoice", taxType: "cgst_sgst", taxRate: 12 });
    expect(m.supplier.name).toBe("Old Name");
    expect(m.supplier.stateCode).toBe("04");
    expect(m.totals.taxRows[1].label).toBe("UTGST");
    expect(m.supplier.showGstin).toBe(true);
  });
  it("falls back to live settings for a corrupt snapshot", () => {
    expect(vendorFromSnapshot("{nope", vendor)).toBe(vendor);
    expect(vendorFromSnapshot(undefined, vendor)).toBe(vendor);
    expect(vendorFromSnapshot("", vendor)).toBe(vendor);
  });
  it("parses the bank snapshot only when no bank is given", () => {
    const snap = JSON.stringify({ ...bank, bankName: "HDFC" });
    expect(bankFromSnapshot(snap, null)?.bankName).toBe("HDFC");
    expect(bankFromSnapshot(snap, bank)).toBe(bank);
    expect(bankFromSnapshot("{bad", null)).toBeNull();
    expect(bankFromSnapshot("", null)).toBeNull();
    const m = buildRenderModel({ invoice: { ...base, bankSnapshot: snap }, vendor, bank: null, logo: null, signatureDataUri: null, appVersion: "x" });
    expect(m.bank?.lines[0]).toEqual({ label: "Bank", value: "HDFC" });
  });
  it("omits the bank block when there is no bank", () => {
    expect(make({}, {}, { bank: null }).bank).toBeNull();
  });
});