<script lang="ts">
    import "$lib/iconify-offline";
    import { slide } from "svelte/transition";
    import Icon from "@iconify/svelte";
    import Search from "./Search.svelte";
    import { overlayOpen, overlayClose } from "$lib/overlay-store";
    import { t as tStatic, T } from "$lib/translations";
    import type { Translations } from "$lib/translations";
    import { page } from "$app/stores";

    function isActiveLink(href: string, pathname: string): boolean {
        if (!href) return false;
        const h = href.replace(/\/$/, "") || "/";
        const p = pathname.replace(/\/$/, "") || "/";
        if (h === "/") return p === "/";
        return p === h || p.startsWith(h + "/");
    }

    interface NavLink {
        href: string;
        label: string;
    }

    interface SocialLink {
        href: string;
        icon: string;
        label?: string;
    }

    let {
        links = [],
        socialLinks = [],
        logoUrl = null,
        logoSvgHtml = null,
        translations = {},
    }: {
        links?: NavLink[];
        socialLinks?: SocialLink[];
        logoUrl?: string | null;
        logoSvgHtml?: string | null;
        translations?: Translations | null;
    } = $props();

    function t(key: string) {
        return tStatic(translations ?? null, key);
    }
    let menuOpen = $state(false);
    let searchOpen = $state(false);

    function toggleMenu() {
        if (menuOpen) {
            menuOpen = false;
        } else {
            searchOpen = false;
            menuOpen = true;
        }
    }

    function closeMenu() {
        menuOpen = false;
    }

    function closeOverlays() {
        menuOpen = false;
        searchOpen = false;
    }

    $effect(() => {
        if (searchOpen) menuOpen = false;
    });
    $effect(() => {
        if (menuOpen) searchOpen = false;
    });
    $effect(() => {
        if (typeof window === "undefined") return;
        const open = menuOpen || searchOpen;
        overlayOpen.set(open);
        overlayClose.set(open ? closeOverlays : null);
    });
    $effect(() => {
        if (typeof window === "undefined") return;
        const open = menuOpen || searchOpen;
        if (open) window.scrollTo({ top: 0, behavior: "smooth" });
        document.documentElement.style.overflow = open ? "hidden" : "";
        document.body.style.overflow = open ? "hidden" : "";
        return () => {
            document.documentElement.style.overflow = "";
            document.body.style.overflow = "";
        };
    });
    $effect(() => {
        if (!menuOpen) return;
        const onKey = (e: KeyboardEvent) => {
            if (e.key === "Escape") closeMenu();
        };
        window.addEventListener("keydown", onKey);
        return () => window.removeEventListener("keydown", onKey);
    });
</script>

<header
    id="horizontal-navigation"
    class="gradient-blob-bg sticky top-0 z-20 border-b border-white/30 shadow-2xl backdrop-blur-md bg-wald-50"
>
    <div class="flex items-center justify-between container-custom py-2">
        <a
            href="/"
            aria-label={t(T.site_name_fallback)}
            class="logo flex items-center origin-left font-bold text-lg tracking-wide hover:scale-[1.12] transition-transform duration-200 ease-out relative"
        >
            {#if logoSvgHtml}
                <span
                    class="logo-svg h-10 w-auto inline-flex items-center text-inherit [&_svg]:block [&_svg]:h-full [&_svg]:w-auto [&_svg]:max-h-10"
                    aria-hidden="true">{@html logoSvgHtml}</span
                >
            {:else if logoUrl && logoUrl.trim() !== ""}
                <img src={logoUrl} alt="" class="h-10 w-auto object-contain" />
            {:else}
                <span>{t(T.site_name_fallback)}</span>
            {/if}
        </a>

        <!-- Desktop: horizontale Nav (ab lg) -->
        <nav
            class="hidden lg:flex items-center gap-4"
            aria-label={t(T.header_nav_aria)}
        >
            {#each links as link}
                {@const active = isActiveLink(link.href, $page.url.pathname)}
                <a
                    href={link.href}
                    class="text-[.7rem] py-1 {active ? 'font-bold  ' : ''}"
                    aria-current={active ? "page" : undefined}
                >
                    {link.label}
                </a>
            {/each}
            <div class="w-1 h-4"></div>
            {#each socialLinks as social}
                {@const isInternal = social.href.startsWith("/")}
                <a
                    href={social.href}
                    target={isInternal ? undefined : "_blank"}
                    rel={isInternal ? undefined : "noopener noreferrer"}
                    class="p-1.5 -m-1.5 rounded-xs transition-colors flex items-center justify-center"
                    aria-label={social.label || t(T.header_social_aria)}
                >
                    <Icon icon={social.icon} aria-hidden="true" />
                </a>
            {/each}
            <button
                type="button"
                class="p-2 -mr-2 rounded-xs transition-colors flex items-center justify-center"
                aria-label={searchOpen
                    ? t(T.header_search_close)
                    : t(T.header_search_open)}
                aria-expanded={searchOpen}
                aria-controls="search-panel"
                onclick={() => (searchOpen = !searchOpen)}
            >
                {#if searchOpen}
                    <Icon
                        icon="mdi:close"
                        class="text-error!"
                        aria-hidden="true"
                    />
                {:else}
                    <Icon icon="mdi:magnify" aria-hidden="true" />
                {/if}
            </button>
        </nav>

        <!-- Mobile: Such- und Burger-Buttons (unter lg) -->
        <div class="lg:hidden flex items-center gap-1">
            <button
                type="button"
                class="p-2 rounded-xs transition-colors flex items-center justify-center"
                aria-label={searchOpen
                    ? t(T.header_search_close)
                    : t(T.header_search_open)}
                aria-expanded={searchOpen}
                aria-controls="search-panel"
                onclick={() => (searchOpen = !searchOpen)}
            >
                {#if searchOpen}
                    <Icon
                        icon="mdi:close"
                        class="text-2xl text-error!"
                        aria-hidden="true"
                    />
                {:else}
                    <Icon
                        icon="mdi:magnify"
                        class="text-2xl"
                        aria-hidden="true"
                    />
                {/if}
            </button>
            <button
                type="button"
                class="p-2 -mr-2 hover:bg-stein-0/10 rounded-xs transition-colors flex items-center justify-center"
                aria-label={menuOpen
                    ? t(T.header_menu_close)
                    : t(T.header_menu_open)}
                aria-controls={menuOpen ? "mobile-nav" : undefined}
                aria-expanded={menuOpen}
                onclick={toggleMenu}
            >
                <span class="sr-only"
                    >{menuOpen
                        ? t(T.header_menu_close)
                        : t(T.header_menu_open)}</span
                >
                {#if menuOpen}
                    <Icon
                        icon="mdi:close"
                        class="text-2xl"
                        aria-hidden="true"
                    />
                {:else}
                    <Icon icon="mdi:menu" class="text-2xl" aria-hidden="true" />
                {/if}
            </button>
        </div>
    </div>

    <Search bind:open={searchOpen} />

    <!-- Mobile: Dropdown-Menü (unter lg) -->
    {#if menuOpen}
        <div
            id="mobile-nav"
            class="lg:hidden border-t border-stein-0/10 bg-stein-900/98 backdrop-blur overflow-hidden"
            role="dialog"
            aria-label="Navigation"
            in:slide={{ duration: 200 }}
            out:slide={{ duration: 150 }}
        >
            <nav
                class="container-custom py-4 flex flex-col gap-1"
                aria-label={t(T.header_nav_aria)}
            >
                {#each links as link}
                    {@const active = isActiveLink(
                        link.href,
                        $page.url.pathname,
                    )}
                    <a
                        href={link.href}
                        class="block py-4 px-3 rounded-xs transition-colors text-base {active
                            ? 'font-bold text-wald-300 bg-wald-700/20 border-l-4 border-wald-400'
                            : 'text-stein-100 hover:text-stein-0 hover:bg-stein-0/10 border-l-4 border-transparent'}"
                        aria-current={active ? "page" : undefined}
                        onclick={closeMenu}
                    >
                        {link.label}
                    </a>
                {/each}
                {#if socialLinks.length > 0}
                    <div
                        class="flex flex-wrap gap-2 pt-2 mt-2 border-t border-stein-0/10"
                    >
                        {#each socialLinks as social}
                            {@const isInternal = social.href.startsWith("/")}
                            <a
                                href={social.href}
                                target={isInternal ? undefined : "_blank"}
                                rel={isInternal
                                    ? undefined
                                    : "noopener noreferrer"}
                                class="inline-flex p-2 text-stein-100 hover:text-stein-0 hover:bg-stein-0/10 rounded-xs transition-colors"
                                aria-label={social.label ||
                                    t(T.header_social_aria)}
                                onclick={closeMenu}
                            >
                                <Icon
                                    icon={social.icon}
                                    class="text-[1.5rem]"
                                    aria-hidden="true"
                                />
                            </a>
                        {/each}
                    </div>
                {/if}
            </nav>
        </div>
    {/if}
</header>
