// A balance refresh the popup started on one network, and that returns after
// the network was switched to another, writes nothing: the switch cleared every
// address's balances, and the previous network's must not come back over them
// (https://git.eeqj.de/sneak/AutistMask/issues/577). The switch is made either
// by the user in this popup's Settings, or by the background after the user
// approved a site's request, which changes only the stored record. Driven
// through the real popup over a stored profile on Ethereum Mainnet. The same
// refresh in the background is in tests/backgroundStateIsolation.test.js.

const {
    bootPopup,
    cleanupPopup,
    unversionedValidProfile,
    TOKEN_ADDRESS,
} = require("./support/popupBoot");
const { applyChainSwitchFields } = require("../src/shared/chainSwitchFields");

afterEach(() => {
    cleanupPopup();
});

// Starts the ten-second refresh and holds it open. The balance stand-in writes
// Ethereum Mainnet's balances in place, on the records handed in, as the real
// refreshBalances() does, once the returned function is called. Resolves with
// that function and the refresh still running.
async function holdRefresh(page) {
    const { refreshBalances } = require("../src/shared/balances");
    let answer;
    refreshBalances.mockImplementationOnce(async (wallets) => {
        await new Promise((resolve) => {
            answer = resolve;
        });
        wallets[0].addresses[0].balance = "7.0";
        wallets[0].addresses[0].tokenBalances = [
            {
                address: TOKEN_ADDRESS,
                name: "Test Token",
                symbol: "TST",
                decimals: 18,
                balance: "5.0",
                holders: null,
            },
        ];
    });
    const ticking = page.tick();
    await page.settle();
    return {
        finish: async () => {
            answer();
            await ticking;
        },
    };
}

// Picks `networkId` in the Settings network selector, as the user does.
async function chooseNetwork(page, networkId) {
    const select = page.node("settings-network");
    select.value = networkId;
    for (const fn of select.listeners.change) await fn();
    await page.settle();
}

// The stored record holds none of Ethereum Mainnet's balances, and no refresh
// recorded as done.
function expectNothingStored(page) {
    const stored = page.storage.read("autistmask");
    expect(stored.networkId).toBe("sepolia");
    expect(stored.wallets[0].addresses[0].balance).toBe("0");
    expect(stored.wallets[0].addresses[0].tokenBalances).toEqual([]);
    expect(stored.lastBalanceRefresh).toBe(0);
}

test("a refresh that returns after a switch in Settings writes nothing, and the next one runs on the new network", async () => {
    const page = await bootPopup(unversionedValidProfile());
    expect(page.pageErrors).toEqual([]);
    const { refreshBalances } = require("../src/shared/balances");
    const { state } = require("../src/shared/state");

    const refresh = await holdRefresh(page);
    await page.click("btn-settings");
    await chooseNetwork(page, "sepolia");
    await refresh.finish();

    expect(state.wallets[0].addresses[0].balance).toBe("0");
    expect(state.wallets[0].addresses[0].tokenBalances).toEqual([]);
    expectNothingStored(page);

    await page.click("btn-settings-back");
    expect(page.visibleViews()).toEqual(["main"]);
    expect(page.text("total-value")).toBe("0.0000 SepoliaETH");

    await page.tick();

    expect(refreshBalances.mock.lastCall[4]).toBe("sepolia");
    expect(page.storage.read("autistmask").lastBalanceRefresh).toBeGreaterThan(
        0,
    );
});

// The stored record still holds Ethereum Mainnet while the refresh's save reads
// it, so only this page's own network shows the switch.
test("a refresh whose save is reading the stored record when the user switches in Settings writes nothing", async () => {
    const page = await bootPopup(unversionedValidProfile());
    expect(page.pageErrors).toEqual([]);
    const { state } = require("../src/shared/state");

    const refresh = await holdRefresh(page);
    await page.click("btn-settings");

    // The next read of the stored record, the refresh's save's, is held.
    const get = page.storage.local.get;
    const read = get.getMockImplementation();
    let releaseRead;
    get.mockImplementationOnce(async (key) => {
        await new Promise((resolve) => {
            releaseRead = resolve;
        });
        return read(key);
    });
    const finishing = refresh.finish();
    await page.settle();

    // The user picks Sepolia meanwhile; the switch's own save waits for the
    // refresh's save to let the lock go.
    const select = page.node("settings-network");
    select.value = "sepolia";
    const switching = Promise.all(select.listeners.change.map((fn) => fn()));
    await page.settle();

    releaseRead();
    await finishing;
    await switching;
    await page.settle();

    expect(state.networkId).toBe("sepolia");
    expect(state.wallets[0].addresses[0].balance).toBe("0");
    expect(state.wallets[0].addresses[0].tokenBalances).toEqual([]);
    expectNothingStored(page);
});

test("a refresh that returns after the background switched the network writes nothing", async () => {
    const page = await bootPopup(unversionedValidProfile());
    expect(page.pageErrors).toEqual([]);
    const { saveState } = require("../src/shared/state");

    const refresh = await holdRefresh(page);
    // The background writes the switch to Sepolia, as its updateState() does
    // once the user approves a site's request. This page is not told.
    const record = page.storage.read("autistmask");
    applyChainSwitchFields(record, "sepolia");
    page.storage.write("autistmask", record);
    await refresh.finish();

    expectNothingStored(page);

    // Nor does a later save by this page, such as every navigation makes.
    await saveState();

    expectNothingStored(page);
});