// The balance and fee lines of the Send and confirmation screens, and the fee
// line they must share with the approval screen.
//
// An ETH balance, a token balance or a fee below 0.000001 rendered as zero on
// these screens (https://git.eeqj.de/sneak/AutistMask/issues/343): the stored
// balances and the fee were each cut to six decimal places, a rule of their
// own, while the approval screen showed the same fee through
// src/shared/amountDisplay.js with the nonzero floor. The balances are now
// stored exactly, and the screens show them and the fee through that helper.
//
// Driven through the real refreshBalances(), Send screen, confirmation screen
// and approval screen, with only the node, the explorer and the DOM stubbed: a
// balance written onto state by hand would skip the place the cut happened.

"use strict";

// What the stub node answers. Each test sets what it needs.
const mockNode = {
    balanceWei: 0n,
    feeData: { maxFeePerGas: 1n, gasPrice: 1n },
};

// The token rows the stub explorer reports for the address.
const mockExplorer = { items: [] };

jest.mock("ethers", () => {
    const actual = jest.requireActual("ethers");
    class StubProvider {
        async getBalance() {
            return mockNode.balanceWei;
        }
        async lookupAddress() {
            return null;
        }
        async getFeeData() {
            return mockNode.feeData;
        }
        async estimateGas() {
            return 21000n;
        }
        async getCode() {
            return "0x";
        }
        async getTransactionCount() {
            return 1;
        }
    }
    return {
        ...actual,
        JsonRpcProvider: StubProvider,
        Network: { from: () => ({}) },
    };
});

jest.mock("../src/shared/log", () => ({
    log: {
        debugf: () => {},
        infof: () => {},
        warnf: () => {},
        errorf: () => {},
    },
    // The explorer's token list, which refreshBalances() also fetches.
    debugFetch: jest.fn(async () => ({
        ok: true,
        status: 200,
        json: async () => mockExplorer.items,
    })),
    setRuntimeDebug: () => {},
    isDebug: () => false,
}));

// The confirmation screen's Etherscan label lookup is the only fetch() these
// screens make; it fails, as it does offline.
global.fetch = jest.fn(() => {
    throw new Error("tests must not perform network requests");
});

// The approval the background hands the approval screen. Set per test.
let approvalDetails = null;

const { makeStorageStub } = require("./support/storageStub");
global.chrome = {
    storage: makeStorageStub(),
    runtime: {
        connect: () => ({
            postMessage() {},
            disconnect() {},
            onDisconnect: { addListener() {} },
        }),
        sendMessage(message, callback) {
            callback(
                message.type === "AUTISTMASK_GET_APPROVAL"
                    ? approvalDetails
                    : undefined,
            );
        },
    },
};

// A stub DOM: every id resolves to a recording element.
const elements = new Map();

function makeEl(id) {
    const handlers = new Map();
    return {
        id,
        textContent: "",
        innerHTML: "",
        value: "",
        disabled: false,
        style: {},
        dataset: {},
        classList: {
            add() {},
            remove() {},
            toggle() {},
            contains: () => false,
        },
        handlers,
        addEventListener(name, fn) {
            handlers.set(name, fn);
        },
        appendChild(child) {
            return child;
        },
        querySelectorAll: () => [],
        querySelector: () => null,
        remove() {},
        focus() {},
    };
}

global.document = {
    getElementById(id) {
        if (!elements.has(id)) elements.set(id, makeEl(id));
        return elements.get(id);
    },
    createElement: (tag) => makeEl(tag),
    body: { prepend() {}, appendChild() {} },
    addEventListener() {},
};
global.navigator = { clipboard: { writeText() {} } };

const { refreshBalances } = require("../src/shared/balances");
const { state } = require("../src/shared/state");
const { prices, clearPrices } = require("../src/shared/prices");
const send = require("../src/popup/views/send");
const confirmTx = require("../src/popup/views/confirmTx");
const approval = require("../src/popup/views/approval");
const {
    addressHoldsFunds,
    balanceLinesForAddress,
} = require("../src/popup/views/helpers");

const HOLDER = "0x" + "a".repeat(40);
const RECIPIENT = "0xC0FfEE0000000000000000000000000000c0fFEe";

// 0.0000005 ETH, or 0.0000005 of an 18-decimal token.
const HALF_MICRO_ETH = 500000000000n;

// A token the bundled list does not know.
const TOKEN = "0x" + "d".repeat(40);

// The explorer's row for TOKEN, holding `value` base units. With only five
// holders, it is listed only when the user tracks the token.
function tokenRow(value, token = {}) {
    return {
        value: String(value),
        token: {
            type: "ERC-20",
            address_hash: TOKEN,
            symbol: "TOK",
            name: "Token",
            decimals: "18",
            holders_count: "5",
            ...token,
        },
    };
}

function text(id) {
    return global.document.getElementById(id).textContent;
}

function errors() {
    return global.document.getElementById("confirm-errors").innerHTML;
}

// The ETH balance the node reports and the token rows the explorer reports,
// fetched and stored exactly where the popup stores them.
async function refreshWith(balanceWei, tokenItems = []) {
    mockNode.balanceWei = balanceWei;
    mockExplorer.items = tokenItems;
    state.wallets = [{ name: "Wallet 1", addresses: [{ address: HOLDER }] }];
    state.selectedWallet = 0;
    state.selectedAddress = 0;
    await refreshBalances(
        state.wallets,
        "https://rpc.example.invalid",
        "https://blockscout.example/api/v2",
        state.trackedTokens,
        "mainnet",
    );
}

// Press Review on the Send screen for a send of `token` ("ETH" or a token
// address), and show the confirmation screen it leads to with its fee estimate
// settled.
async function confirmSend(amount, token = "ETH") {
    let txInfo = null;
    send.init({ showConfirmTx: (info) => (txInfo = info) });
    state.selectedToken = token;
    global.document.getElementById("send-to").value = RECIPIENT;
    global.document.getElementById("send-amount").value = amount;
    await global.document
        .getElementById("btn-send-review")
        .handlers.get("click")();
    confirmTx.show(txInfo);
    for (let i = 0; i < 10; i++) await new Promise((r) => setTimeout(r, 0));
}

// The approval screen for a dApp transaction of 21000 gas, the gas the stub
// node estimates for the send above.
async function approveTxWithFeePerGas(maxFeePerGas) {
    approvalDetails = {
        type: "tx",
        hostname: "dapp.example",
        approvedFrom: HOLDER,
        approvedTx: {
            to: RECIPIENT,
            value: "0",
            data: "0x",
            chainId: "0x1",
            gasLimit: "21000",
            maxFeePerGas: String(maxFeePerGas),
            nonce: 0,
        },
    };
    await approval.show("1");
}

beforeEach(() => {
    elements.clear();
    state.selectedToken = null;
    state.trackedTokens = [];
    state.fraudContracts = [];
    state.currentView = null;
    mockNode.feeData = { maxFeePerGas: 1n, gasPrice: 1n };
});

describe("an ETH balance below 0.000001 never renders as zero", () => {
    test("on the Send screen", async () => {
        await refreshWith(HALF_MICRO_ETH);
        state.selectedToken = "ETH";
        send.updateSendBalance();
        expect(text("send-balance")).toBe("Current balance: 0.0000005 ETH");
    });

    test("on the confirmation screen", async () => {
        await refreshWith(HALF_MICRO_ETH);
        await confirmSend("0.0000001");
        expect(text("confirm-balance")).toBe("0.0000005 ETH");
    });

    test("while a balance above the floor keeps four decimals", async () => {
        await refreshWith(1234567890000000000n);
        await confirmSend("0.1");
        expect(text("confirm-balance")).toBe("1.2345 ETH");
    });
});

// A token the user tracks stays on the balance list when the explorer's row is
// dropped, so a holding of it below 0.000001 reached these screens as zero, and
// the send was checked against zero.
describe("a tracked token holding below 0.000001 never renders as zero", () => {
    beforeEach(() => {
        state.trackedTokens = [
            { address: TOKEN, symbol: "TOK", name: "Token", decimals: 18 },
        ];
    });

    test("on the Send screen", async () => {
        await refreshWith(10n ** 18n, [tokenRow(HALF_MICRO_ETH)]);
        state.selectedToken = TOKEN;
        send.updateSendBalance();
        expect(text("send-balance")).toBe("Current balance: 0.0000005 TOK");
    });

    test("on the confirmation screen, which checks the send against it", async () => {
        await refreshWith(10n ** 18n, [tokenRow(HALF_MICRO_ETH)]);
        await confirmSend("0.0000005", TOKEN);
        expect(text("confirm-balance")).toBe("0.0000005 TOK");
        expect(errors()).toBe("");
        await confirmSend("0.0000006", TOKEN);
        expect(errors()).toContain(
            "You have 0.0000005 TOK but are trying to send 0.0000006 TOK.",
        );
    });

    // The stored balance keeps all 24 places, and the balance check reads the
    // first 18 of them rather than refusing it as no balance at all.
    test("with more than 18 decimals, the send is checked against 18 of them", async () => {
        state.trackedTokens[0].decimals = 24;
        // 1.5 plus one base unit.
        const value = 15n * 10n ** 23n + 1n;
        await refreshWith(10n ** 18n, [tokenRow(value, { decimals: "24" })]);
        await confirmSend("1.5", TOKEN);
        expect(text("confirm-balance")).toBe("1.5000 TOK");
        expect(errors()).toBe("");
    });

    test("with more than 18 decimals and a holding below 10^-18", async () => {
        state.trackedTokens[0].decimals = 24;
        // One base unit, 0.000000000000000000000001 TOK, and no ETH, so the
        // token is all the address holds.
        await refreshWith(0n, [tokenRow(1n, { decimals: "24" })]);
        state.selectedToken = TOKEN;
        send.updateSendBalance();
        expect(text("send-balance")).toBe(
            "Current balance: 0.000000000000000000000001 TOK",
        );
        await confirmSend("0.000000000000000001", TOKEN);
        expect(text("confirm-balance")).toBe("0.000000000000000000000001 TOK");
        expect(errors()).toContain(
            "You have 0.000000000000000000000001 TOK but are trying to send" +
                " 0.000000000000000001 TOK.",
        );
        // Listed with zero balances hidden, and counted as funds.
        const addr = state.wallets[0].addresses[0];
        expect(
            balanceLinesForAddress(addr, state.trackedTokens, false),
        ).toContain(`data-token="${TOKEN}"`);
        expect(addressHoldsFunds(addr)).toBe(true);
    });

    test("while an untracked holding below 0.000001 is still not listed", async () => {
        state.trackedTokens = [];
        await refreshWith(10n ** 18n, [
            tokenRow(HALF_MICRO_ETH, { holders_count: "50000" }),
        ]);
        expect(state.wallets[0].addresses[0].tokenBalances).toEqual([]);
    });
});

describe("a fee below 0.000001 ETH never renders as zero", () => {
    test("when the estimate and the reserve are the same", async () => {
        await refreshWith(10n ** 18n);
        await confirmSend("0.1");
        // 21000 gas at 1 wei is 0.000000000000021 ETH, shown to its first
        // significant digit.
        expect(text("confirm-fee-amount")).toBe("0.00000000000002 ETH");
    });

    test("when they differ, on both lines", async () => {
        mockNode.feeData = { maxFeePerGas: 2n, gasPrice: 1n };
        await refreshWith(10n ** 18n);
        await confirmSend("0.1");
        expect(text("confirm-fee-amount")).toBe("~0.00000000000002 ETH");
        expect(text("confirm-fee-reserve")).toBe(
            "up to 0.00000000000004 ETH reserved",
        );
    });
});

// The confirmation screen shows the reserve alone when the node quotes no
// cheaper estimate, and that reserve is the same gas limit times maximum fee
// per gas that the approval screen calls the max fee. An ETH price is set, as
// it is on mainnet, so the USD value has to match too.
describe("the same fee reads the same on the confirmation and approval screens", () => {
    beforeEach(() => {
        prices.ETH = 3000;
    });
    afterEach(() => {
        clearPrices();
    });

    test.each([
        // 21000 gas at 1 wei.
        ["below the floor", 1n, "0.00000000000002 ETH (< $0.01)"],
        // 0.001235294117631 ETH, which is $3.71. Pricing the truncated
        // 0.0012 instead would read $3.60.
        ["with more than four decimals", 58823529411n, "0.0012 ETH ($3.71)"],
    ])("%s", async (_label, feePerGas, expected) => {
        mockNode.feeData = { maxFeePerGas: feePerGas, gasPrice: feePerGas };
        await refreshWith(10n ** 18n);
        await confirmSend("0.1");
        expect(text("confirm-fee-amount")).toBe(expected);
        await approveTxWithFeePerGas(feePerGas);
        expect(text("approve-tx-fee")).toBe(expected);
    });
});