import { describe, expect, it } from "vitest";
import { clientGstinStateError, gstinChecksumError, gstinFullError, vendorGstinError } from "./validators";

// Same GSTINs as the Rust tests in src-tauri/src/gst.rs.
describe("GSTIN checksum", () => {
  it("accepts valid GSTINs", () => {
    expect(gstinChecksumError("27AAPFU0939F1ZV")).toBeUndefined();
    expect(gstinChecksumError("07AAGFF2194N1Z1")).toBeUndefined();
    expect(gstinChecksumError("29ABCDE1234F1ZW")).toBeUndefined();
  });

  it("rejects a wrong check digit and bad shapes", () => {
    expect(gstinChecksumError("29ABCDE1234F1Z5")).toMatch(/expected W/);
    expect(gstinChecksumError("27AAPFU0939F1ZX")).toMatch(/check digit/);
    expect(gstinChecksumError("27AAPFU0939F1Z")).toMatch(/15-character/);
  });

  it("cross-checks the PAN and the state", () => {
    expect(gstinFullError("27AAPFU0939F1ZV", "AAPFU0939F")).toBeUndefined();
    expect(gstinFullError("27AAPFU0939F1ZV", "AAPFU0939G")).toMatch(/PAN/);
    expect(gstinFullError("")).toBeUndefined();
    expect(vendorGstinError("unregistered", "", "", "29")).toBeUndefined();
    expect(vendorGstinError("regular", "", "", "27")).toMatch(/needs a GSTIN/);
    expect(vendorGstinError("regular", "27AAPFU0939F1ZV", "AAPFU0939F", "29")).toMatch(/state code/);
    expect(vendorGstinError("regular", "27AAPFU0939F1ZV", "AAPFU0939F", "27")).toBeUndefined();
  });
});

describe("clientGstinStateError", () => {
  it("allows empty and NA", () => {
    expect(clientGstinStateError("", "29")).toBeUndefined();
    expect(clientGstinStateError("NA", "29")).toBeUndefined();
  });
  it("checks shape and checksum", () => {
    expect(clientGstinStateError("29ABCDE1234F1Z5", "29")).toMatch(/check digit/);
    expect(clientGstinStateError("29ABC", "")).toMatch(/15-character/);
  });
  it("checks the state prefix only when a state is chosen", () => {
    expect(clientGstinStateError("29ABCDE1234F1ZW", "29")).toBeUndefined();
    expect(clientGstinStateError("29abcde1234f1zw", "")).toBeUndefined();
    expect(clientGstinStateError("29ABCDE1234F1ZW", "27")).toMatch(/starts with 29/);
  });
});