const {
    $,
    showView,
    showFlash,
    balanceLinesForAddress,
    addressDotHtml,
    escapeHtml,
    formatAddressHtml,
    truncateMiddle,
} = 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 } = require("./send");
const { log } = require("../../shared/log");
const QRCode = require("qrcode");

function show() {
    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 " + (wi + 1) + "." + (ai + 1);
    $("address-dot").innerHTML = addressDotHtml(addr.address);
    $("address-full").dataset.full = addr.address;
    $("address-full").textContent = addr.address;
    $("address-usd-total").textContent = formatUsd(getAddressValueUsd(addr));
    const ensEl = $("address-ens");
    if (addr.ensName) {
        ensEl.innerHTML =
            addressDotHtml(addr.address) + escapeHtml(addr.ensName);
        ensEl.classList.remove("hidden");
    } else {
        ensEl.classList.add("hidden");
    }
    $("address-balances").innerHTML = balanceLinesForAddress(
        addr,
        state.trackedTokens,
        state.showZeroBalanceTokens,
    );
    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");
    return (
        d.getFullYear() +
        "-" +
        pad(d.getMonth() + 1) +
        "-" +
        pad(d.getDate()) +
        " " +
        pad(d.getHours()) +
        ":" +
        pad(d.getMinutes()) +
        ":" +
        pad(d.getSeconds())
    );
}

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 unique counterparty addresses for ENS resolution.
        const counterparties = [
            ...new Set(
                txs.map((tx) => (tx.direction === "sent" ? tx.to : tx.from)),
            ),
        ];
        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 = $("tx-list");
    if (txs.length === 0) {
        list.innerHTML =
            '<div class="text-muted text-xs py-1">No transactions found.</div>';
        return;
    }
    let html = "";
    let i = 0;
    for (const tx of txs) {
        const counterparty = tx.direction === "sent" ? tx.to : tx.from;
        const ensName = ensNameMap.get(counterparty) || null;
        const dirLabel = tx.direction === "sent" ? "Sent" : "Received";
        const amountStr = escapeHtml(tx.value + " " + tx.symbol);
        const maxAddr = Math.max(10, 36 - Math.max(0, amountStr.length - 10));
        const displayAddr = ensName || truncateMiddle(counterparty, maxAddr);
        const addrStr = escapeHtml(displayAddr);
        const dot = addressDotHtml(counterparty);
        const err = tx.isError ? " (failed)" : "";
        const opacity = tx.isError ? " opacity:0.5;" : "";
        const ago = escapeHtml(timeAgo(tx.timestamp));
        const iso = escapeHtml(isoDate(tx.timestamp));
        html += `<div class="tx-row py-2 border-b border-border-light text-xs cursor-pointer hover:bg-hover" data-tx="${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);
            showTxDetail(loadedTxs[idx]);
        });
    });
}

function etherscanAddressLink(address) {
    return `https://etherscan.io/address/${address}`;
}

function etherscanTxLink(hash) {
    return `https://etherscan.io/tx/${hash}`;
}

const EXT_ICON =
    `<span style="display:inline-block;width:10px;height:10px;margin-left:4px;vertical-align:middle">` +
    `<svg viewBox="0 0 12 12" fill="none" stroke="currentColor" stroke-width="1.5">` +
    `<path d="M4.5 1.5H2a.5.5 0 00-.5.5v8a.5.5 0 00.5.5h8a.5.5 0 00.5-.5V7.5"/>` +
    `<path d="M7 1.5h3.5V5M7 5.5L10.5 1.5"/>` +
    `</svg></span>`;

function copyableHtml(text, extraClass) {
    const cls =
        "underline decoration-dashed cursor-pointer" +
        (extraClass ? " " + extraClass : "");
    return `<span class="${cls}" data-copy="${escapeHtml(text)}">${escapeHtml(text)}</span>`;
}

function txDetailAddressHtml(address) {
    const ensName = ensNameMap.get(address) || null;
    const dot = addressDotHtml(address);
    const link = etherscanAddressLink(address);
    const extLink = `<a href="${link}" target="_blank" rel="noopener" class="inline-flex items-center">${EXT_ICON}</a>`;
    if (ensName) {
        return (
            dot +
            copyableHtml(ensName, "") +
            extLink +
            `<div class="break-all">` +
            copyableHtml(address, "break-all") +
            `</div>`
        );
    }
    return dot + copyableHtml(address, "break-all") + extLink;
}

function txDetailHashHtml(hash) {
    const link = etherscanTxLink(hash);
    const extLink = `<a href="${link}" target="_blank" rel="noopener" class="inline-flex items-center">${EXT_ICON}</a>`;
    return copyableHtml(hash, "break-all") + extLink;
}

function showTxDetail(tx) {
    $("tx-detail-hash").innerHTML = txDetailHashHtml(tx.hash);
    $("tx-detail-from").innerHTML = txDetailAddressHtml(tx.from);
    $("tx-detail-to").innerHTML = txDetailAddressHtml(tx.to);
    $("tx-detail-value").textContent = tx.value + " " + tx.symbol;
    $("tx-detail-time").textContent =
        isoDate(tx.timestamp) + " (" + timeAgo(tx.timestamp) + ")";
    $("tx-detail-status").textContent = tx.isError ? "Failed" : "Success";
    showView("transaction");

    // Attach copy handlers
    document
        .getElementById("view-transaction")
        .querySelectorAll("[data-copy]")
        .forEach((el) => {
            el.onclick = () => {
                navigator.clipboard.writeText(el.dataset.copy);
                showFlash("Copied!");
            };
        });
}

function init(ctx) {
    $("address-full").addEventListener("click", () => {
        const addr = $("address-full").dataset.full;
        if (addr) {
            navigator.clipboard.writeText(addr);
            showFlash("Copied!");
        }
    });

    $("btn-address-back").addEventListener("click", () => {
        ctx.renderWalletList();
        showView("main");
    });

    $("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 = "";
        updateSendBalance();
        showView("send");
    });

    $("btn-receive").addEventListener("click", () => {
        const addr = currentAddress();
        const address = addr ? addr.address : "";
        $("receive-address").textContent = address;
        if (address) {
            QRCode.toCanvas($("receive-qr"), address, {
                width: 200,
                margin: 2,
                color: { dark: "#000000", light: "#ffffff" },
            });
        }
        showView("receive");
    });

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

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

module.exports = { init, show };