'use client';

import { useEffect, useRef, useState } from 'react';
import { usePathname, useRouter } from 'next/navigation';
import { motion, AnimatePresence } from 'framer-motion';
import {
  ChevronDown,
  LogOut,
  Settings,
  UserCircle,
  CreditCard,
  Twitter,
  Linkedin,
  Github,
  X,
} from 'lucide-react';
import { getAuth, signOut } from 'firebase/auth';
import { app, db } from '@/lib/firebase';
import { useAuth } from '@/contexts/AuthContext';
import toast from 'react-hot-toast';
import { doc, onSnapshot } from 'firebase/firestore';

export default function DashboardLayout({ children }: { children: React.ReactNode }) {
  const { user } = useAuth();
  const router = useRouter();
  const pathname = usePathname();
  const auth = getAuth(app);

  const [isOpen, setIsOpen] = useState(false);
  const [credits, setCredits] = useState<number | null>(null);
  const [showCreditsPulse, setShowCreditsPulse] = useState(false);
  const [isQuickBuyOpen, setIsQuickBuyOpen] = useState(false);
  const dropdownRef = useRef<HTMLDivElement>(null);

  useEffect(() => {
    const handleClickOutside = (event: MouseEvent) => {
      if (dropdownRef.current && !dropdownRef.current.contains(event.target as Node)) {
        setIsOpen(false);
      }
    };
    document.addEventListener('mousedown', handleClickOutside);
    return () => document.removeEventListener('mousedown', handleClickOutside);
  }, []);

  useEffect(() => {
    if (!user) {
      setCredits(null);
      return;
    }
    const docRef = doc(db, 'users', user.uid);
    const unsubscribe = onSnapshot(
      docRef,
      (snapshot) => {
        const balance = snapshot.data()?.creditBalance ?? 0;
        setCredits((prev) => {
          if (prev !== null && prev !== balance) {
            setShowCreditsPulse(true);
            window.setTimeout(() => setShowCreditsPulse(false), 900);
          }
          return balance;
        });
      },
      (error) => {
        console.error('Failed to subscribe to credits', error);
        setCredits(0);
      }
    );
    return () => unsubscribe();
  }, [user]);

  const handleSignOut = async () => {
    try {
      await signOut(auth);
      toast.success('Signed out.');
      router.push('/auth');
    } catch (error) {
      console.error('Sign out failed', error);
      toast.error('Unable to sign out. Please try again.');
    }
  };

  const initial = user?.email?.[0]?.toUpperCase() ?? '?';

  const pricingTiers = [
    { label: '10 Credits', price: '€10', value: 10 },
    { label: '50 Credits', price: '€45', value: 50 },
    { label: '100 Credits', price: '€85', value: 100 },
  ];

  const handleQuickBuy = async (value: number, price: string) => {
    if (!user) {
      toast.error('Please sign in to purchase credits.');
      return;
    }
    try {
      const response = await fetch('/api/stripe/checkout', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json' },
        body: JSON.stringify({
          credits: value,
          amount: Number(price.replace('€', '')),
          userId: user.uid,
        }),
      });
      if (!response.ok) {
        throw new Error('Checkout failed');
      }
      const data = await response.json();
      if (data.url) {
        window.location.href = data.url;
      } else {
        throw new Error('Missing checkout URL');
      }
    } catch (error) {
      console.error('Quick buy failed', error);
      toast.error('Unable to start checkout.');
    }
  };

  return (
    <div className="min-h-screen bg-gradient-to-br from-[#0f0b1a] via-[#1b1330] to-[#0f1b3d] text-white flex flex-col">
      <header className="border-b border-white/10 bg-white/5 backdrop-blur-sm">
        <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-4 flex items-center justify-between">
          <div className="text-sm text-[#9ca3af]">Dashboard</div>
          <div className="flex items-center gap-3">
            <motion.button
              onClick={() => setIsQuickBuyOpen(true)}
              className="relative rounded-full bg-[#8b5cf6]/20 border border-[#8b5cf6]/40 px-3 py-1.5 text-xs font-semibold text-white hover:bg-[#8b5cf6]/30 transition"
              animate={showCreditsPulse ? { scale: [1, 1.08, 1] } : { scale: 1 }}
              transition={{ duration: 0.6 }}
            >
              💎 {credits ?? '—'} Credits
              {showCreditsPulse && (
                <span className="absolute inset-0 rounded-full bg-[#8b5cf6]/20 blur-md" />
              )}
            </motion.button>
            <div className="relative" ref={dropdownRef}>
            <button
              onClick={() => setIsOpen((prev) => !prev)}
              className="flex items-center gap-3 rounded-full border border-white/10 bg-white/5 px-3 py-1.5 hover:bg-white/10 transition"
            >
              <span className="h-9 w-9 rounded-full bg-[#8b5cf6] text-white flex items-center justify-center font-semibold">
                {initial}
              </span>
              <ChevronDown className={`h-4 w-4 text-[#9ca3af] transition ${isOpen ? 'rotate-180' : ''}`} />
            </button>

            <AnimatePresence>
              {isOpen && (
                <motion.div
                  initial={{ opacity: 0, y: 10, scale: 0.98 }}
                  animate={{ opacity: 1, y: 0, scale: 1 }}
                  exit={{ opacity: 0, y: 6, scale: 0.98 }}
                  transition={{ duration: 0.2 }}
                  className="absolute right-0 mt-3 w-64 rounded-2xl border border-[#8b5cf6]/30 bg-[#1a1625] shadow-2xl overflow-hidden"
                >
                  <div className="px-4 py-4 border-b border-white/10">
                    <div className="flex items-center gap-3">
                      <span className="h-10 w-10 rounded-full bg-[#8b5cf6]/30 border border-[#8b5cf6]/50 flex items-center justify-center font-semibold">
                        {initial}
                      </span>
                      <div>
                        <p className="text-sm font-semibold">Account</p>
                        <p className="text-xs text-[#9ca3af]">{user?.email ?? 'Unknown user'}</p>
                      </div>
                    </div>
                    <div className="mt-3 text-xs text-[#9ca3af]">
                      Credits: <span className="text-white">{credits ?? '—'}</span>
                    </div>
                  </div>
                  <div className="p-2 space-y-1">
                    <button
                      onClick={() => {
                        setIsOpen(false);
                        router.push('/dashboard/settings');
                      }}
                      className="w-full flex items-center gap-2 px-3 py-2 rounded-xl text-sm text-[#9ca3af] hover:text-white hover:bg-white/5 transition"
                    >
                      <UserCircle className="h-4 w-4" />
                      Profile
                    </button>
                    <button
                      onClick={() => {
                        setIsOpen(false);
                        router.push('/dashboard/settings');
                      }}
                      className="w-full flex items-center gap-2 px-3 py-2 rounded-xl text-sm text-[#9ca3af] hover:text-white hover:bg-white/5 transition"
                    >
                      <Settings className="h-4 w-4" />
                      Settings
                    </button>
                    <button
                      onClick={() => {
                        setIsOpen(false);
                        router.push('/dashboard/credits');
                      }}
                      className="w-full flex items-center gap-2 px-3 py-2 rounded-xl text-sm text-[#9ca3af] hover:text-white hover:bg-white/5 transition"
                    >
                      <CreditCard className="h-4 w-4" />
                      Billing
                    </button>
                    <button
                      onClick={() => {
                        setIsOpen(false);
                        handleSignOut();
                      }}
                      className="w-full flex items-center gap-2 px-3 py-2 rounded-xl text-sm text-red-300 hover:text-red-200 hover:bg-red-500/10 transition"
                    >
                      <LogOut className="h-4 w-4" />
                      Sign Out
                    </button>
                  </div>
                </motion.div>
              )}
            </AnimatePresence>
            </div>
          </div>
        </div>
      </header>

      <div className="flex-1">{children}</div>

      <AnimatePresence>
        {isQuickBuyOpen && (
          <motion.div
            className="fixed inset-0 z-50 flex items-center justify-center bg-black/60 px-4"
            initial={{ opacity: 0 }}
            animate={{ opacity: 1 }}
            exit={{ opacity: 0 }}
            onClick={() => setIsQuickBuyOpen(false)}
          >
            <motion.div
              initial={{ scale: 0.96, opacity: 0, y: 20 }}
              animate={{ scale: 1, opacity: 1, y: 0 }}
              exit={{ scale: 0.96, opacity: 0, y: 10 }}
              transition={{ duration: 0.2 }}
              className="w-full max-w-md rounded-3xl border border-[#8b5cf6]/30 bg-[#1a1625] p-6 shadow-2xl"
              onClick={(event) => event.stopPropagation()}
            >
              <div className="flex items-start justify-between">
                <div>
                  <h3 className="text-xl font-semibold">Quick Buy Credits</h3>
                  <p className="text-xs text-[#9ca3af] mt-1">Choose a package to top up.</p>
                </div>
                <button
                  onClick={() => setIsQuickBuyOpen(false)}
                  className="text-[#9ca3af] hover:text-white transition"
                  aria-label="Close quick buy"
                >
                  <X className="h-4 w-4" />
                </button>
              </div>
              <div className="mt-5 space-y-3">
                {pricingTiers.map((tier) => (
                  <button
                    key={tier.value}
                    onClick={() => handleQuickBuy(tier.value, tier.price)}
                    className="w-full flex items-center justify-between rounded-2xl border border-white/10 bg-[#0f0b1a] px-4 py-3 text-sm text-white hover:border-[#8b5cf6]/40 hover:bg-[#8b5cf6]/10 transition"
                  >
                    <span>{tier.label}</span>
                    <span className="text-[#9ca3af]">{tier.price}</span>
                  </button>
                ))}
              </div>
              <button
                onClick={() => {
                  setIsQuickBuyOpen(false);
                  router.push('/dashboard/credits');
                }}
                className="mt-4 w-full px-4 py-2 rounded-2xl bg-[#8b5cf6] text-white font-semibold hover:bg-[#7c3aed] transition"
              >
                Go to Billing & Credits
              </button>
            </motion.div>
          </motion.div>
        )}
      </AnimatePresence>

      <footer className="mt-auto border-t border-white/10 bg-[#120f1f]/80 backdrop-blur-sm">
        <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-6 text-center space-y-4">
          <div className="flex flex-wrap items-center justify-center gap-4 text-sm text-[#9ca3af]">
            <a href="#" className="hover:text-white transition">Privacy</a>
            <span className="text-[#2f2544]">|</span>
            <a href="#" className="hover:text-white transition">Terms</a>
            <span className="text-[#2f2544]">|</span>
            <a href="#" className="hover:text-white transition">Support</a>
            <span className="text-[#2f2544]">|</span>
            <a href="#" className="hover:text-white transition">Docs</a>
          </div>
          <div className="flex items-center justify-center gap-4 text-[#9ca3af]">
            <a href="#" aria-label="Twitter" className="hover:text-white transition">
              <Twitter className="h-4 w-4" />
            </a>
            <a href="#" aria-label="LinkedIn" className="hover:text-white transition">
              <Linkedin className="h-4 w-4" />
            </a>
            <a href="#" aria-label="GitHub" className="hover:text-white transition">
              <Github className="h-4 w-4" />
            </a>
          </div>
          <p className="text-xs text-[#9ca3af]">© 2026 HolaCompi. All rights reserved.</p>
        </div>
      </footer>
    </div>
  );
}