// Shared DOM helpers used by all views.

const { DEBUG } = require("../../shared/constants");
const {
    formatUsd,
    getPrice,
    getAddressValueUsd,
} = require("../../shared/prices");
const { state, saveState } = require("../../shared/state");

// When views are added, removed, or transitions between them change,
// update the view-navigation documentation in README.md to match.
const VIEWS = [
    "welcome",
    "add-wallet",
    "import-key",
    "main",
    "address",
    "address-token",
    "send",
    "confirm-tx",
    "wait-tx",
    "success-tx",
    "error-tx",
    "receive",
    "add-token",
    "settings",
    "delete-wallet-confirm",
    "settings-addtoken",
    "transaction",
    "approve-site",
    "approve-tx",
    "approve-sign",
    "export-privkey",
];

function $(id) {
    return document.getElementById(id);
}

function showError(id, msg) {
    const el = $(id);
    el.textContent = msg;
    el.classList.remove("hidden");
}

function hideError(id) {
    $(id).classList.add("hidden");
}

function showView(name) {
    for (const v of VIEWS) {
        const el = document.getElementById(`view-${v}`);
        if (el) {
            el.classList.toggle("hidden", v !== name);
        }
    }
    clearFlash();
    state.currentView = name;
    saveState();
    if (DEBUG) {
        const banner = document.getElementById("debug-banner");
        if (banner) {
            banner.textContent = "DEBUG / INSECURE (" + name + ")";
        }
    }
}

let flashTimer = null;

function clearFlash() {
    if (flashTimer) {
        clearTimeout(flashTimer);
        flashTimer = null;
    }
    $("flash-msg").textContent = "";
}

function showFlash(msg, duration = 2000) {
    clearFlash();
    $("flash-msg").textContent = msg;
    flashTimer = setTimeout(() => {
        $("flash-msg").textContent = "";
        flashTimer = null;
    }, duration);
}

function balanceLine(symbol, amount, price, tokenId) {
    const qty = amount.toFixed(4);
    const usd = price ? formatUsd(amount * price) || " " : " ";
    const tokenAttr = tokenId ? ` data-token="${tokenId}"` : "";
    const clickClass = tokenId
        ? " cursor-pointer hover:bg-hover balance-row"
        : "";
    return (
        `<div class="flex text-xs${clickClass}"${tokenAttr}>` +
        `<span class="flex justify-between" style="width:42ch;max-width:100%">` +
        `<span>${symbol}</span>` +
        `<span>${qty}</span>` +
        `</span>` +
        `<span class="text-right text-muted flex-1">${usd}</span>` +
        `</div>`
    );
}

function balanceLinesForAddress(addr, trackedTokens, showZero) {
    let html = balanceLine(
        "ETH",
        parseFloat(addr.balance || "0"),
        getPrice("ETH"),
        "ETH",
    );
    const seen = new Set();
    for (const t of addr.tokenBalances || []) {
        const bal = parseFloat(t.balance || "0");
        if (bal === 0 && !showZero) continue;
        html += balanceLine(
            t.symbol,
            bal,
            getPrice(t.symbol),
            t.address.toLowerCase(),
        );
        seen.add(t.address.toLowerCase());
    }
    if (showZero && trackedTokens) {
        for (const t of trackedTokens) {
            if (seen.has(t.address.toLowerCase())) continue;
            html += balanceLine(
                t.symbol,
                0,
                getPrice(t.symbol),
                t.address.toLowerCase(),
            );
        }
    }
    return html;
}

// Truncate the middle of a string, replacing removed characters with "…".
// Safety: refuses to truncate more than 10 characters, which is the maximum
// that still prevents address spoofing attacks (see Display Consistency in
// README).  Callers that need to display less should use a different UI
// approach rather than silently making addresses insecure.
function truncateMiddle(str, maxLen) {
    if (str.length <= maxLen) return str;
    const removed = str.length - maxLen + 1; // +1 for the ellipsis char
    if (removed > 10) {
        maxLen = str.length - 10 + 1;
    }
    if (maxLen >= str.length) return str;
    const half = Math.floor((maxLen - 1) / 2);
    return str.slice(0, half) + "\u2026" + str.slice(-(maxLen - 1 - half));
}

// 16 colors evenly spaced around the hue wheel (22.5° apart),
// all at HSL saturation 70%, lightness 50% for uniform vibrancy.
const ADDRESS_COLORS = [
    "#d92626",
    "#d96926",
    "#d9ac26",
    "#c2d926",
    "#80d926",
    "#3dd926",
    "#26d953",
    "#26d996",
    "#26d9d9",
    "#2696d9",
    "#2653d9",
    "#3d26d9",
    "#8026d9",
    "#c226d9",
    "#d926ac",
    "#d92669",
];

function addressColor(address) {
    const idx = parseInt(address.slice(2, 6), 16) % 16;
    return ADDRESS_COLORS[idx];
}

function addressDotHtml(address) {
    const color = addressColor(address);
    return `<span style="width:8px;height:8px;border-radius:50%;display:inline-block;background:${color};margin-right:4px;vertical-align:middle;flex-shrink:0;"></span>`;
}

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

// Look up an address across all wallets and return its title
// (e.g. "Address 1.2") or null if it's not one of ours.
function addressTitle(address, wallets) {
    const lower = address.toLowerCase();
    for (let wi = 0; wi < wallets.length; wi++) {
        const addrs = wallets[wi].addresses;
        for (let ai = 0; ai < addrs.length; ai++) {
            if (addrs[ai].address.toLowerCase() === lower) {
                return wallets[wi].name + " \u2014 Address " + (ai + 1);
            }
        }
    }
    return null;
}

// Render an address with color dot, optional ENS name, optional title,
// and optional truncation. Title and ENS are shown as bold labels above
// the full address.
function formatAddressHtml(address, ensName, maxLen, title) {
    const dot = addressDotHtml(address);
    const displayAddr = maxLen ? truncateMiddle(address, maxLen) : address;
    if (title || ensName) {
        let html = "";
        if (title) {
            html += `<div class="flex items-center font-bold">${dot}${escapeHtml(title)}</div>`;
        }
        if (ensName) {
            html += `<div class="flex items-center font-bold">${title ? "" : dot}${escapeHtml(ensName)}</div>`;
        }
        html += `<div class="break-all">${escapeHtml(displayAddr)}</div>`;
        return html;
    }
    return `<div class="flex items-center">${dot}<span class="break-all">${escapeHtml(displayAddr)}</span></div>`;
}

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";
}

module.exports = {
    $,
    showError,
    hideError,
    showView,
    showFlash,
    balanceLine,
    balanceLinesForAddress,
    addressColor,
    addressDotHtml,
    escapeHtml,
    addressTitle,
    formatAddressHtml,
    truncateMiddle,
    isoDate,
    timeAgo,
};