import { describe, it } from "node:test";
import assert from "node:assert/strict";
import { formatUsdtAmount, parseUsdtAmount } from "../src/domain/amount.js";

void describe("USDT amount parsing", () => {
  void it("parses whole and fractional USDT with 6 decimals", () => {
    assert.equal(parseUsdtAmount("1"), 1_000_000n);
    assert.equal(parseUsdtAmount("1.234567"), 1_234_567n);
    assert.equal(parseUsdtAmount("0.000001"), 1n);
  });

  void it("rejects zero, negative, malformed, and over-precise values", () => {
    assert.throws(() => parseUsdtAmount("0"), /greater than zero/);
    assert.throws(() => parseUsdtAmount("-1"), /valid decimal/);
    assert.throws(() => parseUsdtAmount("1.0000001"), /at most 6 decimals/);
    assert.throws(() => parseUsdtAmount("1e3"), /valid decimal/);
  });

  void it("formats raw token units back to a trimmed USDT string", () => {
    assert.equal(formatUsdtAmount(1_234_567n), "1.234567");
    assert.equal(formatUsdtAmount(1_000_000n), "1");
    assert.equal(formatUsdtAmount(10n), "0.00001");
  });
});