---
import { getLangFromUrl, getTranslations } from "@/i18n";

const lang = getLangFromUrl(Astro.url);
const t = getTranslations(lang);
const pathname = Astro.url.pathname;
const items = [
    { href: `/${lang}/`, label: t.nav.home, exact: true },
    { href: `/${lang}/about/`, label: t.nav.about },
    { href: `/${lang}/tags/`, label: t.nav.tags },
    { href: `/${lang}/timeline/`, label: t.nav.timeline },
    { href: `/${lang}/friends/`, label: t.nav.friends },
];

const isCurrent = (href: string, exact = false) =>
    exact
        ? pathname === href || pathname === href.slice(0, -1)
        : pathname.startsWith(href);
---

<nav class="site-nav" aria-label="Site navigation">
    <div class="site-nav-desktop">
        {
            items.map(({ href, label, exact }) => (
                <a
                    href={href}
                    aria-current={isCurrent(href, exact) ? "page" : undefined}
                >
                    {label}
                </a>
            ))
        }
    </div>

    <details class="site-nav-mobile">
        <summary>☰ {lang === "zh" ? "导航栏" : "Menu"}</summary>
        <div class="dropdown-menu">
            {
                items.map(({ href, label, exact }) => (
                    <a
                        href={href}
                        aria-current={isCurrent(href, exact) ? "page" : undefined}
                    >
                        {label}
                    </a>
                ))
            }
        </div>
    </details>
</nav>

<script>
    document.addEventListener("click", (event) => {
        const nav = document.querySelector(".site-nav-mobile");

        if (!nav) return;

        const target = event.target as Node;

        if (!nav.contains(target)) {
            nav.removeAttribute("open");
        }
    });
</script>

<style>
    .site-nav {
        margin: 1rem 0;
        padding-bottom: 1rem;
        position: relative;
    }

    .site-nav-desktop {
        display: flex;
        gap: 1.5rem;
        align-items: center;
    }

    .site-nav a {
        position: relative;
        color: var(--text-color);
        text-decoration: none;
        font-weight: 500;
        font-size: 1.05rem;
        line-height: 1.4;
    }

    .site-nav-desktop a::after {
        content: "";
        position: absolute;
        left: 50%;
        bottom: -0.28rem;
        width: 100%;
        height: 2px;
        background: var(--deep-red);
        transform: translateX(-50%) scaleX(0);
        transform-origin: center;
        transition: transform 0.18s ease;
    }

    .site-nav-desktop a:hover::after,
    .site-nav-desktop a:focus-visible::after,
    .site-nav-desktop a[aria-current="page"]::after {
        transform: translateX(-50%) scaleX(1);
    }

    .site-nav a:focus-visible {
        outline: 2px solid var(--url-color);
        outline-offset: 0.35rem;
        text-decoration: none;
    }

    :global(.dark) .site-nav a {
        color: var(--text-color-dark);
    }

    :global(.dark) .site-nav a:hover {
        color: #fff;
    }

    .site-nav-mobile {
        display: none;
        position: relative;
    }

    .site-nav-mobile summary {
        list-style: none;
        cursor: pointer;
        display: inline-block;
        font-weight: 500;
        font-size: 1rem;
        color: var(--text-color);
        text-decoration: none;
        user-select: none;
    }

    .site-nav-mobile summary::-webkit-details-marker {
        display: none;
    }

    :global(.dark) .site-nav-mobile summary {
        color: white;
    }

    .dropdown-menu {
        position: absolute;
        top: calc(100% + 0.75rem);
        left: 0;
        min-width: 180px;
        display: flex;
        flex-direction: column;
        gap: 0.75rem;
        padding: 0.9rem 1rem;
        background: #fffaf5;
        border: 2px dashed #8b5e3c;
        border-radius: 0;
        z-index: 20;
    }

    .dropdown-menu a {
        font-size: 1rem;
        text-decoration: none;
        color: black;
    }

    .dropdown-menu a:hover {
        text-decoration: underline;
    }

    .dropdown-menu a[aria-current="page"] {
        color: var(--deep-red);
        font-weight: 600;
    }

    :global(.dark) .dropdown-menu {
        background: #1f1b18;
        border-color: #c8a98a;
    }

    :global(.dark) .dropdown-menu a {
        color: white;
    }

    @media (max-width: 700px) {
        .site-nav-desktop {
            display: none;
        }

        .site-nav-mobile {
            display: block;
        }
    }
</style>