"use client";

import Link from "next/link";
import { usePathname } from "next/navigation";
import { useEffect, useState } from "react";
import {
    LayoutDashboard,
    Users,
    CalendarCheck,
    CreditCard,
    Settings,
    LogOut,
    Brain,
} from "lucide-react";
import { UserButton, useUser } from "@clerk/nextjs";

interface Recommendation {
    id: string;
    status: string;
}

export function Sidebar() {
    const pathname = usePathname();
    const { user } = useUser();
    const [pendingCount, setPendingCount] = useState(0);

    useEffect(() => {
        const fetchPending = async () => {
            try {
                const res = await fetch("/api/recommendations");
                if (res.ok) {
                    const data = await res.json();
                    const pending = (data.recommendations || []).filter(
                        (r: Recommendation) => r.status === "pending"
                    );
                    setPendingCount(pending.length);
                }
            } catch (e) {
                console.error("Failed to fetch pending recommendations", e);
            }
        };
        fetchPending();
    }, []);

    const menuItems = [
        { icon: LayoutDashboard, label: "Dashboard", href: "/" },
        { icon: Users, label: "Users", href: "/users" },
        {
            icon: Brain,
            label: (
                <span className="flex items-center">
                    AI Recommendations
                    {pendingCount > 0 && (
                        <span className="ml-2 inline-block bg-red-600 text-xs rounded-full px-2 py-0.5">
                            {pendingCount}
                        </span>
                    )}
                </span>
            ),
            href: "/recommendations",
        },
        { icon: CalendarCheck, label: "Attendance", href: "/attendance" },
        { icon: CreditCard, label: "Payments", href: "/payments" },
        { icon: Settings, label: "Settings", href: "/settings" },
    ];

    return (
        <aside className="w-20 hover:w-64 bg-slate-900 text-white h-screen fixed left-0 top-0 flex flex-col border-r border-slate-800 transition-all duration-300 z-50 group overflow-hidden">
            <div className="p-6 border-b border-slate-800 flex items-center overflow-hidden whitespace-nowrap">
                <h1 className="text-2xl font-bold bg-gradient-to-r from-blue-400 to-indigo-400 bg-clip-text text-transparent opacity-0 group-hover:opacity-100 transition-opacity duration-300">
                    FitAI Admin
                </h1>
            </div>

            <nav className="flex-1 p-4 space-y-2">
                {menuItems.map((item) => {
                    const Icon = item.icon;
                    const isActive = pathname === item.href;
                    const label = typeof item.label === "string" ? item.label : item.label;
                    return (
                        <Link
                            key={item.href}
                            href={item.href}
                            className={`flex items-center gap-3 px-4 py-3 rounded-lg transition-all duration-200 ${isActive
                                ? "bg-blue-600 text-white shadow-lg shadow-blue-900/20"
                                : "text-slate-400 hover:bg-slate-800 hover:text-white"}`}
                        >
                            <div className="min-w-[20px]">
                                <Icon size={20} className={isActive ? "text-white" : "text-slate-500 group-hover:text-white"} />
                            </div>
                            <span className="font-medium opacity-0 group-hover:opacity-100 transition-opacity duration-300 whitespace-nowrap overflow-hidden">
                                {label}
                            </span>
                        </Link>
                    );
                })}
            </nav>

            <div className="p-4 border-t border-slate-800">
                <div className="flex items-center gap-3 px-2 py-3 rounded-lg bg-slate-800/50 overflow-hidden whitespace-nowrap">
                    <div className="min-w-[32px]">
                        <UserButton afterSignOutUrl="/" />
                    </div>
                    <div className="flex-1 min-w-0 opacity-0 group-hover:opacity-100 transition-opacity duration-300">
                        <p className="text-sm font-medium text-white truncate">
                            {user?.fullName || "Admin User"}
                        </p>
                        <p className="text-xs text-slate-400 truncate">
                            {user?.primaryEmailAddress?.emailAddress}
                        </p>
                    </div>
                </div>
            </div>
        </aside>
    );
}
