const { $, showView, showFlash, balanceLinesForAddress } = require("./helpers");
const { state, currentAddress } = require("../../shared/state");
const { formatUsd, getAddressValueUsd } = require("../../shared/prices");
const { fetchRecentTransactions } = require("../../shared/transactions");
const { updateSendBalance } = 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-full").textContent = addr.address;
    $("address-usd-total").textContent = formatUsd(getAddressValueUsd(addr));
    const ensEl = $("address-ens");
    if (addr.ensName) {
        ensEl.textContent = addr.ensName;
        ensEl.classList.remove("hidden");
    } else {
        ensEl.classList.add("hidden");
    }
    $("address-balances").innerHTML = balanceLinesForAddress(addr);
    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";
}

function escapeHtml(s) {
    const div = document.createElement("div");
    div.textContent = s;
    return div.innerHTML;
}

let loadedTxs = [];

async function loadTransactions(address) {
    try {
        const txs = await fetchRecentTransactions(address, state.blockscoutUrl);
        loadedTxs = txs;
        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;
    }
    list.innerHTML = "";
    txs.forEach((tx, i) => {
        const counterparty = tx.direction === "sent" ? tx.to : tx.from;
        const dirLabel = tx.direction === "sent" ? "Sent" : "Received";
        const errorStyle = tx.isError ? " opacity:0.5" : "";

        const row = document.createElement("div");
        row.className =
            "py-2 border-b border-border-light text-xs cursor-pointer hover:bg-hover";
        if (errorStyle) row.style.cssText = errorStyle;

        const line1 = document.createElement("div");
        line1.className = "flex justify-between";
        const age = document.createElement("span");
        age.className = "text-muted";
        age.textContent = timeAgo(tx.timestamp);
        age.title = isoDate(tx.timestamp);
        const dir = document.createElement("span");
        dir.className = tx.isError ? "text-muted" : "";
        dir.textContent = dirLabel + (tx.isError ? " (failed)" : "");
        line1.appendChild(age);
        line1.appendChild(dir);

        const line2 = document.createElement("div");
        line2.className = "flex justify-between";
        const addr = document.createElement("span");
        addr.className = "break-all pr-2";
        addr.textContent = counterparty;
        const amount = document.createElement("span");
        amount.className = "shrink-0";
        amount.textContent = tx.value + " " + tx.symbol;
        line2.appendChild(addr);
        line2.appendChild(amount);

        row.appendChild(line1);
        row.appendChild(line2);
        row.addEventListener("click", () => {
            state.selectedTx = i;
            showTxDetail(tx);
        });
        list.appendChild(row);
    });
}

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

function renderSendTokenSelect(addr) {
    const sel = $("send-token");
    sel.innerHTML = '<option value="ETH">ETH</option>';
    for (const t of addr.tokenBalances || []) {
        const opt = document.createElement("option");
        opt.value = t.address;
        opt.textContent = t.symbol;
        sel.appendChild(opt);
    }
}

function init(ctx) {
    $("address-full").addEventListener("click", () => {
        const addr = $("address-full").textContent;
        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 };