// Shared DOM helpers used by all views.

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

const VIEWS = [
    "welcome",
    "add-wallet",
    "import-key",
    "main",
    "address",
    "send",
    "confirm-tx",
    "receive",
    "add-token",
    "settings",
    "transaction",
    "approve",
];

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();
    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) {
    const qty = amount.toFixed(4);
    const usd = price ? formatUsd(amount * price) : "";
    return (
        `<div class="flex text-xs">` +
        `<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) {
    let html = balanceLine(
        "ETH",
        parseFloat(addr.balance || "0"),
        getPrice("ETH"),
    );
    for (const t of addr.tokenBalances || []) {
        const bal = parseFloat(t.balance || "0");
        if (bal === 0) continue;
        html += balanceLine(t.symbol, bal, getPrice(t.symbol));
    }
    return html;
}

function truncateMiddle(str, maxLen) {
    if (str.length <= maxLen) return str;
    if (maxLen < 5) return str.slice(0, maxLen);
    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>`;
}

module.exports = {
    $,
    showError,
    hideError,
    showView,
    showFlash,
    balanceLinesForAddress,
    addressColor,
    addressDotHtml,
    truncateMiddle,
};