const { $, showView, showFlash } = require("./helpers");
const { hdWalletFromXprv, isValidXprv } = require("../../shared/wallet");
const { encryptWithPassword } = require("../../shared/vault");
const { state, saveState } = require("../../shared/state");
const { scanForAddresses } = require("../../shared/balances");

function show() {
    $("import-xprv-key").value = "";
    $("import-xprv-password").value = "";
    $("import-xprv-password-confirm").value = "";
    showView("import-xprv");
}

function init(ctx) {
    $("btn-import-xprv-confirm").addEventListener("click", async () => {
        const xprv = $("import-xprv-key").value.trim();
        if (!xprv) {
            showFlash("Please enter your extended private key.");
            return;
        }
        if (!isValidXprv(xprv)) {
            showFlash("Invalid extended private key.");
            return;
        }
        let result;
        try {
            result = hdWalletFromXprv(xprv);
        } catch (e) {
            showFlash("Invalid extended private key.");
            return;
        }
        const { xpub, firstAddress } = result;
        const duplicate = state.wallets.find(
            (w) =>
                (w.type === "hd" || w.type === "xprv") &&
                w.addresses[0] &&
                w.addresses[0].address.toLowerCase() ===
                    firstAddress.toLowerCase(),
        );
        if (duplicate) {
            showFlash("This key is already added (" + duplicate.name + ").");
            return;
        }
        const pw = $("import-xprv-password").value;
        const pw2 = $("import-xprv-password-confirm").value;
        if (!pw) {
            showFlash("Please choose a password.");
            return;
        }
        if (pw.length < 12) {
            showFlash("Password must be at least 12 characters.");
            return;
        }
        if (pw !== pw2) {
            showFlash("Passwords do not match.");
            return;
        }
        const encrypted = await encryptWithPassword(xprv, pw);
        const walletNum = state.wallets.length + 1;
        const wallet = {
            type: "xprv",
            name: "Wallet " + walletNum,
            xpub: xpub,
            encryptedSecret: encrypted,
            nextIndex: 1,
            addresses: [
                { address: firstAddress, balance: "0.0000", tokenBalances: [] },
            ],
        };
        state.wallets.push(wallet);
        state.hasWallet = true;
        await saveState();
        ctx.renderWalletList();
        showView("main");

        // Scan for used HD addresses beyond index 0.
        showFlash("Scanning for addresses...", 30000);
        const scan = await scanForAddresses(xpub, state.rpcUrl);
        if (scan.addresses.length > 1) {
            wallet.addresses = scan.addresses.map((a) => ({
                address: a.address,
                balance: "0.0000",
                tokenBalances: [],
            }));
            wallet.nextIndex = scan.nextIndex;
            await saveState();
            ctx.renderWalletList();
            showFlash("Found " + scan.addresses.length + " addresses.");
        } else {
            showFlash("Ready.", 1000);
        }

        ctx.doRefreshAndRender();
    });

    $("btn-import-xprv-back").addEventListener("click", () => {
        if (!state.hasWallet) {
            showView("welcome");
        } else {
            ctx.renderWalletList();
            showView("main");
        }
    });
}

module.exports = { init, show };