// lookupTokenInfo() cuts the symbol and name it reads off a contract on
// code-point boundaries, as displaySymbol() counts them, so an emoji outside
// the Basic Multilingual Plane is never stored cut in half
// (https://git.eeqj.de/sneak/AutistMask/issues/458).

// An emoji outside the Basic Multilingual Plane: two UTF-16 units.
const FOX = "\u{1F98A}";

// The leading "A" puts every emoji at an odd UTF-16 offset, so a cut that
// counts UTF-16 units lands between the two halves of one.
const SYMBOL = "A" + FOX.repeat(12);
const NAME = "A" + FOX.repeat(64);

// The contract answers symbol(), decimals() and name() with the values above.
jest.doMock("ethers", () => ({
    ...jest.requireActual("ethers"),
    Contract: function () {
        return {
            symbol: async () => SYMBOL,
            decimals: async () => 18n,
            name: async () => NAME,
        };
    },
}));

const { lookupTokenInfo } = require("../src/shared/balances");

const ADDRESS = "0x1111111111111111111111111111111111111111";
const RPC_URL = "https://rpc.example.invalid";

beforeEach(() => {
    // A token found is logged at info level, which is not under test.
    jest.spyOn(console, "log").mockImplementation(() => {});
});

afterEach(() => {
    jest.restoreAllMocks();
});

test("the symbol is cut to 12 code points, never inside an emoji", async () => {
    const { symbol } = await lookupTokenInfo(ADDRESS, RPC_URL, "mainnet");
    expect(symbol).toBe("A" + FOX.repeat(11));
});

test("the name is cut to 64 code points, never inside an emoji", async () => {
    const { name } = await lookupTokenInfo(ADDRESS, RPC_URL, "mainnet");
    expect(name).toBe("A" + FOX.repeat(63));
});