'use client';
import { useState } from "react";
import { Link } from "@/lib/nextRouterAdapter";
import {
  ArrowLeft,
  BarChart3,
  BookOpen,
  ClipboardList,
  DollarSign,
  FileText,
  Lock,
  Megaphone,
  MessageSquare,
  PenLine,
  Sparkles,
  Users,
} from "lucide-react";
import { useAuth } from "@/lib/AuthContext";
import { hasAdminAccess } from "@/lib/adminRules";
import AdminStats from "@/components/liveclass/admin/AdminStats";
import AdminStudents from "@/components/liveclass/admin/AdminStudents";
import AdminCourses from "@/components/liveclass/admin/AdminCourses";
import AdminSubmissions from "@/components/liveclass/admin/AdminSubmissions";
import AdminAnnouncements from "@/components/liveclass/admin/AdminAnnouncements";
import AdminRevenue from "@/components/liveclass/admin/AdminRevenue";
import AdminTemplates from "@/components/liveclass/admin/AdminTemplates";
import AdminBlog from "@/components/liveclass/admin/AdminBlog";
import AdminCommunityMod from "@/components/liveclass/admin/AdminCommunityMod";
import AdminAIFeedback from "@/components/liveclass/admin/AdminAIFeedback";

const BURGUNDY = "#3D0C11";
const GOLD = "#C9973A";
const CREAM = "#FFFFFF";
const IVORY = "#FAF7F2";
const MUTED_WARM = "#6B5B4E";
const BORDER_WARM = "#EDE8E0";

const TABS = [
  { id: "stats", label: "Overview", Icon: BarChart3 },
  { id: "revenue", label: "Revenue", Icon: DollarSign },
  { id: "students", label: "Students", Icon: Users },
  { id: "courses", label: "Courses", Icon: BookOpen },
  { id: "submissions", label: "Submissions", Icon: ClipboardList },
  { id: "community", label: "Community", Icon: MessageSquare },
  { id: "templates", label: "Templates", Icon: FileText },
  { id: "blog", label: "Blog", Icon: PenLine },
  { id: "announcements", label: "Announcements", Icon: Megaphone },
  { id: "ai_feedback", label: "AI Feedback", Icon: Sparkles },
];

export default function AdminDashboard() {
  const { user, isLoadingAuth } = useAuth();
  const [activeTab, setActiveTab] = useState("stats");

  if (isLoadingAuth) {
    return (
      <div className="min-h-screen flex items-center justify-center" style={{ backgroundColor: IVORY }}>
        <div className="w-8 h-8 border-4 rounded-full animate-spin" style={{ borderColor: `rgba(212,175,55,0.2)`, borderTopColor: GOLD }} />
      </div>
    );
  }

  if (!hasAdminAccess(user)) {
    return (
      <div className="min-h-screen flex items-center justify-center" style={{ backgroundColor: IVORY }}>
        <div className="text-center">
          <div className="mx-auto mb-4 flex h-14 w-14 items-center justify-center rounded-2xl" style={{ backgroundColor: "rgba(61,12,17,0.08)", color: BURGUNDY }}>
            <Lock size={26} strokeWidth={2.6} />
          </div>
          <h2 className="font-black text-2xl mb-2" style={{ color: BURGUNDY }}>Access Denied</h2>
          <p className="text-sm mb-6" style={{ color: MUTED_WARM }}>You need admin privileges to view this page.</p>
          <Link to="/dashboard" className="text-sm font-semibold px-5 py-2.5 rounded-xl text-white" style={{ backgroundColor: BURGUNDY }}>
            Go to Dashboard
          </Link>
        </div>
      </div>
    );
  }

  return (
    <div className="min-h-screen" style={{ backgroundColor: IVORY }}>
      {/* Header */}
      <div className="border-b px-6 py-4" style={{ backgroundColor: CREAM, borderColor: BORDER_WARM }}>
        <div className="max-w-7xl mx-auto flex items-center justify-between">
          <div className="flex items-center gap-3">
            <div className="w-9 h-9 rounded-xl flex items-center justify-center font-black text-sm text-white" style={{ backgroundColor: BURGUNDY }}>CV</div>
            <div>
              <div className="font-black text-base" style={{ color: BURGUNDY }}>Admin Dashboard</div>
              <div className="text-xs" style={{ color: GOLD }}>Cambridge Veritas</div>
            </div>
          </div>
          <Link to="/dashboard" className="inline-flex items-center gap-1.5 text-sm font-semibold transition-colors" style={{ color: MUTED_WARM }}>
            <ArrowLeft size={15} strokeWidth={2.4} />
            Student View
          </Link>
        </div>
      </div>

      {/* Tabs */}
      <div className="border-b px-6" style={{ backgroundColor: "white", borderColor: BORDER_WARM }}>
        <div className="max-w-7xl mx-auto flex gap-1 overflow-x-auto">
          {TABS.map((tab) => {
            const Icon = tab.Icon;
            const isActive = activeTab === tab.id;

            return (
              <button
                key={tab.id}
                onClick={() => setActiveTab(tab.id)}
                aria-pressed={isActive}
                className="flex items-center gap-2 px-4 py-3.5 text-sm font-semibold whitespace-nowrap border-b-2 transition-all"
                style={isActive
                  ? { borderColor: GOLD, color: BURGUNDY }
                  : { borderColor: "transparent", color: MUTED_WARM }
                }
              >
                <Icon size={15} strokeWidth={2.3} />
                {tab.label}
              </button>
            );
          })}
        </div>
      </div>

      {/* Content */}
      <div className="max-w-7xl mx-auto px-6 py-8">
        {activeTab === "stats" && <AdminStats />}
        {activeTab === "revenue" && <AdminRevenue />}
        {activeTab === "students" && <AdminStudents />}
        {activeTab === "courses" && <AdminCourses />}
        {activeTab === "submissions" && <AdminSubmissions />}
        {activeTab === "community" && <AdminCommunityMod />}
        {activeTab === "templates" && <AdminTemplates />}
        {activeTab === "blog" && <AdminBlog />}
        {activeTab === "announcements" && <AdminAnnouncements />}
        {activeTab === "ai_feedback" && <AdminAIFeedback />}
      </div>
    </div>
  );
}