const {
    $,
    showView,
    showFlash,
    flashCopyFeedback,
    balanceLinesForAddress,
    addressDotHtml,
    addressTitle,
    escapeHtml,
    truncateMiddle,
    renderAddressHtml,
    attachCopyHandlers,
    goBack,
    pushCurrentView,
} = require("./helpers");
const { state, currentAddress, saveState } = require("../../shared/state");
const { formatUsd, getAddressValueUsd } = require("../../shared/prices");
const {
    fetchRecentTransactions,
    filterTransactions,
} = require("../../shared/transactions");
const { resolveEnsNames } = require("../../shared/ens");
const {
    updateSendBalance,
    renderSendTokenSelect,
    resetSendValidation,
} = require("./send");
const { log } = require("../../shared/log");
const makeBlockie = require("ethereum-blockies-base64");
const { decryptWithPassword } = require("../../shared/vault");
const { getSignerForAddress } = require("../../shared/wallet");

let ctx;

function show() {
    state.selectedToken = null;
    const wallet = state.wallets[state.selectedWallet];
    const addr = wallet.addresses[state.selectedAddress];
    const wi = state.selectedWallet;
    const ai = state.selectedAddress;
    $("address-title").textContent =
        wallet.name + " \u2014 Address " + (ai + 1);
    const blockieEl = $("address-jazzicon");
    blockieEl.innerHTML = "";
    const img = document.createElement("img");
    img.src = makeBlockie(addr.address);
    img.width = 48;
    img.height = 48;
    img.style.imageRendering = "pixelated";
    img.style.borderRadius = "50%";
    blockieEl.appendChild(img);
    const addrTitle = addressTitle(addr.address, state.wallets);
    $("address-line").innerHTML = renderAddressHtml(addr.address, {
        title: addrTitle,
        ensName: addr.ensName,
    });
    $("address-line").dataset.full = addr.address;
    attachCopyHandlers($("address-line"));
    const usdTotal = formatUsd(getAddressValueUsd(addr));
    $("address-usd-total").innerHTML = usdTotal || " ";
    const ensEl = $("address-ens");
    // ENS is now shown inside renderAddressHtml, hide the separate element
    ensEl.classList.add("hidden");
    $("address-balances").innerHTML = balanceLinesForAddress(
        addr,
        state.trackedTokens,
        state.showZeroBalanceTokens,
    );
    $("address-balances")
        .querySelectorAll(".balance-row")
        .forEach((row) => {
            row.addEventListener("click", () => {
                state.selectedToken = row.dataset.token;
                ctx.showAddressToken();
            });
        });
    renderSendTokenSelect(addr);
    $("tx-list").innerHTML =
        '<div class="text-muted text-xs py-1">Loading...</div>';
    showView("address");
    loadTransactions(addr.address);
}

function isoDate(timestamp) {
    const d = new Date(timestamp * 1000);
    const pad = (n) => String(n).padStart(2, "0");
    if (state.utcTimestamps) {
        return (
            d.getUTCFullYear() +
            "-" +
            pad(d.getUTCMonth() + 1) +
            "-" +
            pad(d.getUTCDate()) +
            "T" +
            pad(d.getUTCHours()) +
            ":" +
            pad(d.getUTCMinutes()) +
            ":" +
            pad(d.getUTCSeconds()) +
            "Z"
        );
    }
    const offsetMin = -d.getTimezoneOffset();
    const sign = offsetMin >= 0 ? "+" : "-";
    const absOff = Math.abs(offsetMin);
    const tzStr = sign + pad(Math.floor(absOff / 60)) + ":" + pad(absOff % 60);
    return (
        d.getFullYear() +
        "-" +
        pad(d.getMonth() + 1) +
        "-" +
        pad(d.getDate()) +
        "T" +
        pad(d.getHours()) +
        ":" +
        pad(d.getMinutes()) +
        ":" +
        pad(d.getSeconds()) +
        tzStr
    );
}

function timeAgo(timestamp) {
    const seconds = Math.floor(Date.now() / 1000 - timestamp);
    if (seconds < 60) return seconds + " seconds ago";
    const minutes = Math.floor(seconds / 60);
    if (minutes < 60)
        return minutes + " minute" + (minutes !== 1 ? "s" : "") + " ago";
    const hours = Math.floor(minutes / 60);
    if (hours < 24) return hours + " hour" + (hours !== 1 ? "s" : "") + " ago";
    const days = Math.floor(hours / 24);
    if (days < 30) return days + " day" + (days !== 1 ? "s" : "") + " ago";
    const months = Math.floor(days / 30);
    if (months < 12)
        return months + " month" + (months !== 1 ? "s" : "") + " ago";
    const years = Math.floor(days / 365);
    return years + " year" + (years !== 1 ? "s" : "") + " ago";
}

let loadedTxs = [];

let ensNameMap = new Map();

async function loadTransactions(address) {
    try {
        const rawTxs = await fetchRecentTransactions(
            address,
            state.blockscoutUrl,
        );
        const result = filterTransactions(rawTxs, {
            hideLowHolderTokens: state.hideLowHolderTokens,
            hideFraudContracts: state.hideFraudContracts,
            hideDustTransactions: state.hideDustTransactions,
            dustThresholdGwei: state.dustThresholdGwei,
            fraudContracts: state.fraudContracts,
        });
        const txs = result.transactions;

        // Persist any newly discovered fraud contracts
        if (result.newFraudContracts.length > 0) {
            for (const addr of result.newFraudContracts) {
                if (!state.fraudContracts.includes(addr)) {
                    state.fraudContracts.push(addr);
                }
            }
            await saveState();
        }

        loadedTxs = txs;

        // Collect ALL unique addresses (from + to) for ENS resolution so
        // that reverse lookups work for every displayed address, not just
        // the ones that were originally entered as ENS names.
        const counterparties = [
            ...new Set(txs.flatMap((tx) => [tx.from, tx.to].filter(Boolean))),
        ];
        if (counterparties.length > 0) {
            try {
                ensNameMap = await resolveEnsNames(
                    counterparties,
                    state.rpcUrl,
                );
            } catch {
                ensNameMap = new Map();
            }
        }

        renderTransactions(txs);
    } catch (e) {
        log.errorf("loadTransactions failed:", e.message);
        $("tx-list").innerHTML =
            '<div class="text-muted text-xs py-1">Failed to load transactions.</div>';
    }
}

function renderTransactions(txs) {
    const list = $("tx-list");
    if (txs.length === 0) {
        list.innerHTML =
            '<div class="text-muted text-xs py-1">No transactions found.</div>';
        return;
    }
    let html = "";
    let i = 0;
    for (const tx of txs) {
        // For swap transactions, show the user's own labelled wallet
        // address instead of the contract address (see issue #55).
        const counterparty =
            tx.direction === "contract" && tx.directionLabel === "Swap"
                ? tx.from
                : tx.direction === "sent" || tx.direction === "contract"
                  ? tx.to
                  : tx.from;
        const ensName = ensNameMap.get(counterparty) || null;
        const title = addressTitle(counterparty, state.wallets);
        const dirLabel = tx.directionLabel;
        const amountStr = tx.value
            ? escapeHtml(tx.value + " " + tx.symbol)
            : escapeHtml(tx.symbol);
        const maxAddr = Math.max(32, 36 - Math.max(0, amountStr.length - 10));
        const displayAddr =
            title || ensName || truncateMiddle(counterparty, maxAddr);
        const addrStr = escapeHtml(displayAddr);
        const dot = addressDotHtml(counterparty);
        const err = tx.isError ? " (failed)" : "";
        const opacity = tx.isError ? " opacity:0.5;" : "";
        const ago = escapeHtml(timeAgo(tx.timestamp));
        const iso = escapeHtml(isoDate(tx.timestamp));
        html += `<div class="tx-row py-2 border-b border-border-light text-xs cursor-pointer hover:bg-hover" data-tx="${i}" style="${opacity}">`;
        html += `<div class="flex justify-between"><span class="text-muted" title="${iso}">${ago}</span><span>${dirLabel}${err}</span></div>`;
        html += `<div class="flex justify-between"><span class="flex items-center">${dot}${addrStr}</span><span>${amountStr}</span></div>`;
        html += `</div>`;
        i++;
    }
    list.innerHTML = html;
    list.querySelectorAll(".tx-row").forEach((row) => {
        row.addEventListener("click", () => {
            const idx = parseInt(row.dataset.tx, 10);
            const tx = loadedTxs[idx];
            const counterparty = tx.direction === "sent" ? tx.to : tx.from;
            tx.fromEns = ensNameMap.get(tx.from) || null;
            tx.toEns = ensNameMap.get(tx.to) || null;
            ctx.showTransactionDetail(tx);
        });
    });
}

function init(_ctx) {
    ctx = _ctx;

    $("btn-address-back").addEventListener("click", () => {
        goBack();
    });

    $("btn-send").addEventListener("click", () => {
        const addr =
            state.wallets[state.selectedWallet].addresses[
                state.selectedAddress
            ];
        if (!addr.balance || parseFloat(addr.balance) === 0) {
            showFlash("Cannot send \u2014 zero balance.");
            return;
        }
        $("send-to").value = "";
        $("send-amount").value = "";
        $("send-token").classList.remove("hidden");
        $("send-token-static").classList.add("hidden");
        updateSendBalance();
        resetSendValidation();
        pushCurrentView();
        showView("send");
    });

    $("btn-receive").addEventListener("click", () => {
        ctx.showReceive();
    });

    $("btn-add-token").addEventListener("click", ctx.showAddTokenView);

    // More menu dropdown
    const moreBtn = $("btn-more-menu");
    const moreDropdown = $("more-menu-dropdown");
    moreBtn.addEventListener("click", (e) => {
        e.stopPropagation();
        const isOpen = !moreDropdown.classList.toggle("hidden");
        moreBtn.classList.toggle("bg-fg", isOpen);
        moreBtn.classList.toggle("text-bg", isOpen);
    });
    document.addEventListener("click", () => {
        moreDropdown.classList.add("hidden");
        moreBtn.classList.remove("bg-fg", "text-bg");
    });
    moreDropdown.addEventListener("click", (e) => {
        e.stopPropagation();
    });

    $("btn-export-privkey").addEventListener("click", () => {
        moreDropdown.classList.add("hidden");
        moreBtn.classList.remove("bg-fg", "text-bg");
        pushCurrentView();
        const wallet = state.wallets[state.selectedWallet];
        const addr = wallet.addresses[state.selectedAddress];
        const blockieEl = $("export-privkey-jazzicon");
        blockieEl.innerHTML = "";
        const bImg = document.createElement("img");
        bImg.src = makeBlockie(addr.address);
        bImg.width = 48;
        bImg.height = 48;
        bImg.style.imageRendering = "pixelated";
        bImg.style.borderRadius = "50%";
        blockieEl.appendChild(bImg);
        $("export-privkey-title").textContent =
            wallet.name + " \u2014 Address " + (state.selectedAddress + 1);
        const exportAddrContainer = $("export-privkey-dot").parentElement;
        exportAddrContainer.innerHTML = renderAddressHtml(addr.address);
        attachCopyHandlers(exportAddrContainer);
        $("export-privkey-password").value = "";
        $("export-privkey-flash").textContent = "";
        $("export-privkey-flash").style.visibility = "hidden";
        $("export-privkey-password-section").classList.remove("hidden");
        $("export-privkey-result").classList.add("hidden");
        $("export-privkey-value").textContent = "";
        showView("export-privkey");
    });

    $("btn-export-privkey-confirm").addEventListener("click", async () => {
        const password = $("export-privkey-password").value;
        if (!password) {
            $("export-privkey-flash").textContent = "Password is required.";
            $("export-privkey-flash").style.visibility = "visible";
            return;
        }
        const btn = $("btn-export-privkey-confirm");
        btn.disabled = true;
        btn.classList.add("text-muted");
        const wallet = state.wallets[state.selectedWallet];
        try {
            const secret = await decryptWithPassword(
                wallet.encryptedSecret,
                password,
            );
            const signer = getSignerForAddress(
                wallet,
                state.selectedAddress,
                secret,
            );
            const privateKey = signer.privateKey;
            $("export-privkey-password-section").classList.add("hidden");
            $("export-privkey-value").textContent = privateKey;
            $("export-privkey-result").classList.remove("hidden");
            $("export-privkey-flash").style.visibility = "hidden";
        } catch {
            $("export-privkey-flash").textContent = "Wrong password.";
            $("export-privkey-flash").style.visibility = "visible";
        } finally {
            btn.disabled = false;
            btn.classList.remove("text-muted");
        }
    });

    $("export-privkey-value").addEventListener("click", () => {
        const key = $("export-privkey-value").textContent;
        if (key) {
            navigator.clipboard.writeText(key);
            showFlash("Copied!");
            flashCopyFeedback($("export-privkey-value"));
        }
    });

    $("btn-export-privkey-back").addEventListener("click", () => {
        $("export-privkey-value").textContent = "";
        $("export-privkey-password").value = "";
        goBack();
    });
}

module.exports = { init, show };