// components/portal/UtilitySwitcher.tsx
"use client";

import { useEffect, useMemo, useRef, useState } from "react";
import { useRouter, useSearchParams } from "next/navigation";
import { cn } from "@/lib/utils";

type Item = {
    key: string;        // used in ?t=
    label: string;
    note?: string;
    icon?: string;      // optional icon (public/images/utils/<icon>)
    href: string;       // absolute URL
};

const ITEMS: Item[] = [
    // On-site (embed)
    {
        key: "laser-toolkit",
        label: "Laser Toolkit",
        note: "convert laser settings, interval and more",
        icon: "toolkit.png",
        href: "https://makearmy.io/laser-toolkit",
    },
{
    key: "files",
    label: "File Server",
    note: "download from our file explorer",
    icon: "fs.png",
    href: "https://makearmy.io/files",
},
{
    key: "buying-guide",
    label: "Buying Guide",
    note: "reviews and listings for relevant products",
    icon: "bg.png",
    href: "https://makearmy.io/buying-guide",
},
{
    key: "svgnest",
    label: "SVGnest",
    note: "automatically nests parts and exports svg",
    icon: "nest.png",
    href: "https://makearmy.io/svgnest",
},
{
    key: "background-remover",
    label: "BG Remover",
    note: "open source background remover",
    icon: "bgrm.png",
    href: "https://makearmy.io/background-remover",
},

// Subdomains (new tab)
{
    key: "picsur",
    label: "Picsur",
    note: "Simple Image Host",
    icon: "picsur.png",
    href: "https://images.makearmy.io",
},
{
    key: "privatebin",
    label: "PrivateBin",
    note: "Encrypted internet clipboard",
    icon: "privatebin.png",
    href: "https://paste.makearmy.io/",
},
{
    key: "forgejo",
    label: "Forgejo",
    note: "git for our community members",
    icon: "forgejo.png",
    href: "https://forge.makearmy.io",
},
];

function isExternal(urlStr: string) {
    try {
        const u = new URL(urlStr);
        return u.hostname !== "makearmy.io";
    } catch {
        return true;
    }
}

/** For on-site URLs, convert absolute https://makearmy.io/path → /path for iframe src */
function toOnsitePath(urlStr: string): string {
    try {
        const u = new URL(urlStr);
        if (u.hostname === "makearmy.io") {
            return `${u.pathname}${u.search}${u.hash}`;
        }
    } catch {}
    return urlStr;
}

function Panel({ item }: { item: Item }) {
    const external = isExternal(item.href);

    if (external) {
        return (
            <div className="space-y-2 text-sm">
            <div>
            Opened <span className="font-medium">{item.label}</span> in a new tab.
            </div>
            <a
            href={item.href}
            target="_blank"
            rel="noopener noreferrer"
            className="underline"
            >
            Click here if it didn’t open.
            </a>
            </div>
        );
    }

    const src = toOnsitePath(item.href);
    return (
        <div className="space-y-3">
        <div className="text-sm opacity-70">{item.note}</div>
        <iframe
        key={src}
        src={src}
        className="w-full h-[72vh] rounded-md border"
        sandbox="allow-same-origin allow-scripts allow-forms allow-popups"
        />
        </div>
    );
}

export default function UtilitySwitcher() {
    const router = useRouter();
    const sp = useSearchParams();
    const openedRef = useRef<string | null>(null); // prevent double window.open
    const [firstPaint, setFirstPaint] = useState(true);

    const activeKey = useMemo(() => {
        const t = (sp.get("t") || ITEMS[0].key).toLowerCase();
        return ITEMS.some(i => i.key === t) ? t : ITEMS[0].key;
    }, [sp]);

    const activeItem = useMemo(
        () => ITEMS.find(i => i.key === activeKey) || ITEMS[0],
                               [activeKey]
    );

    function setTab(nextKey: string) {
        const q = new URLSearchParams(sp.toString());
        q.set("t", nextKey);
        router.replace(`/portal/utilities?${q.toString()}`, { scroll: false });
    }

    // When landing on an external tab, open it once in a new tab.
    useEffect(() => {
        const item = activeItem;
        if (!item) return;
        const external = isExternal(item.href);
        if (!external) return;

        // Avoid duplicate opens in strict mode / re-renders
        if (openedRef.current === item.key) return;
        openedRef.current = item.key;

        // Don’t auto-open on the very first paint if you prefer manual click only.
        // Set to false to always auto-open, even on initial load of ?t=<external>.
        const AUTO_OPEN_ON_FIRST_PAINT = true;

        if (AUTO_OPEN_ON_FIRST_PAINT || !firstPaint) {
            window.open(item.href, "_blank", "noopener,noreferrer");
        }
        // eslint-disable-next-line react-hooks/exhaustive-deps
    }, [activeItem?.key, activeItem?.href]);

    useEffect(() => {
        setFirstPaint(false);
    }, []);

    return (
        <div>
        <div className="mb-4 flex flex-wrap items-center gap-2">
        {ITEMS.map((it) => {
            const external = isExternal(it.href);
            const iconSrc = it.icon ? `/images/utils/${it.icon}` : null;
            const isActive = it.key === activeKey;
            return (
                <button
                key={it.key}
                onClick={() => {
                    setTab(it.key);
                    if (external) {
                        // Also open immediately on click
                        window.open(it.href, "_blank", "noopener,noreferrer");
                    }
                }}
                className={cn(
                    "flex items-center gap-2 rounded-md border px-3 py-1.5 text-sm transition",
                    isActive ? "bg-primary text-primary-foreground" : "hover:bg-muted"
                )}
                title={it.note || it.label}
                >
                {iconSrc ? (
                    // eslint-disable-next-line @next/next/no-img-element
                    <img
                    src={iconSrc}
                    alt=""
                    width={16}
                    height={16}
                    className="h-4 w-4 rounded-sm border object-cover"
                    onError={(e) => {
                        (e.currentTarget as HTMLImageElement).style.display = "none";
                    }}
                    />
                ) : null}
                <span className="truncate">{it.label}</span>
                {external && (
                    <span className="rounded bg-muted px-1 py-0.5 text-[10px] uppercase tracking-wide text-muted-foreground">
                    new tab
                    </span>
                )}
                </button>
            );
        })}
        </div>

        <div className="rounded-md border p-4">
        <Panel item={activeItem} />
        </div>
        </div>
    );
}