'use client';
import React, { useState, useEffect } from 'react';
import Link from 'next/link';
import { useAuth } from '@/contexts/AuthContext';
import { useRouter } from 'next/navigation';

const STAT_CARDS = [
  { key: 'revenue_ytd', label: 'Revenue YTD', color: 'text-green-400', bg: 'bg-green-400/10', href: '/admin/accounting/invoices' },
  { key: 'expenses_ytd', label: 'Expenses YTD', color: 'text-red-400', bg: 'bg-red-400/10', href: '/admin/accounting/expenses' },
  { key: 'net_profit', label: 'Net Profit YTD', color: 'text-blue-400', bg: 'bg-blue-400/10', href: '/admin/accounting/reports' },
  { key: 'outstanding', label: 'Outstanding Invoices', color: 'text-yellow-400', bg: 'bg-yellow-400/10', href: '/admin/accounting/invoices?status=pending' },
  { key: 'unreconciled', label: 'Unreconciled Transactions', color: 'text-orange-400', bg: 'bg-orange-400/10', href: '/admin/accounting/reconciliation' },
  { key: 'commissions_outstanding', label: 'Commissions Outstanding', color: 'text-purple-400', bg: 'bg-purple-400/10', href: '/admin/accounting/commissions' },
];

function fmt(cents: number) {
  return '$' + (cents / 100).toLocaleString('en-US', { minimumFractionDigits: 2, maximumFractionDigits: 2 });
}

export default function AccountingDashboard() {
  const { user, loading } = useAuth();
  const router = useRouter();
  const [stats, setStats] = useState<Record<string, number>>({});
  const [siteRevenue, setSiteRevenue] = useState<any[]>([]);
  const [topClients, setTopClients] = useState<any[]>([]);
  const [loadingData, setLoadingData] = useState(true);

  useEffect(() => {
    if (!loading && !user) router.push('/login?next=' + encodeURIComponent(window.location.pathname));
  }, [user, loading, router]);

  useEffect(() => {
    if (!user) return;
    fetch('/api/accounting/dashboard')
      .then(r => r.json())
      .then(d => {
        setStats(d.stats ?? {});
        setSiteRevenue(d.siteRevenue ?? []);
        setTopClients(d.topClients ?? []);
      })
      .catch(() => {})
      .finally(() => setLoadingData(false));
  }, [user]);

  if (loading || loadingData) return (
    <div className="min-h-screen bg-[#0a0a0a] flex items-center justify-center">
      <div className="w-8 h-8 border-2 border-[#1D4ED8] border-t-transparent rounded-full animate-spin" />
    </div>
  );
  if (!user) return null;

  return (
    <div className="min-h-screen bg-[#0a0a0a] text-white p-6">
      <div className="max-w-7xl mx-auto space-y-6">
        {/* Header */}
        <div className="flex items-center justify-between">
          <div>
            <h1 className="text-2xl font-bold text-white">Accounting Dashboard</h1>
            <p className="text-[#888] text-sm mt-1">Relevant Media Properties, LLC</p>
          </div>
          <div className="flex gap-2 flex-wrap">
            <Link href="/admin/accounting/clients" className="px-3 py-1.5 bg-[#FFFFFF] border border-[#2a3a50] rounded text-xs text-[#1D4ED8] hover:bg-[#0d1a2d] transition-colors">+ New Client</Link>
            <Link href="/admin/accounting/orders" className="px-3 py-1.5 bg-[#FFFFFF] border border-[#2a3a50] rounded text-xs text-[#1D4ED8] hover:bg-[#0d1a2d] transition-colors">+ New Order</Link>
            <Link href="/admin/accounting/invoices" className="px-3 py-1.5 bg-[#FFFFFF] border border-[#2a3a50] rounded text-xs text-[#1D4ED8] hover:bg-[#0d1a2d] transition-colors">+ New Invoice</Link>
            <Link href="/admin/accounting/expenses" className="px-3 py-1.5 bg-[#FFFFFF] border border-[#2a3a50] rounded text-xs text-[#1D4ED8] hover:bg-[#0d1a2d] transition-colors">+ Log Expense</Link>
            <Link href="/admin/accounting/reconciliation" className="px-3 py-1.5 bg-[#FFFFFF] border border-[#2a3a50] rounded text-xs text-[#1D4ED8] hover:bg-[#0d1a2d] transition-colors">Upload Bank CSV</Link>
          </div>
        </div>

        {/* Stat Cards */}
        <div className="grid grid-cols-2 md:grid-cols-3 lg:grid-cols-6 gap-3">
          {STAT_CARDS.map(c => (
            <Link key={c.key} href={c.href} className="bg-[#111] border border-[#DCE6F2] rounded-lg p-4 hover:border-[#333] transition-colors">
              <p className={`text-lg font-bold ${c.color}`}>{fmt(stats[c.key] ?? 0)}</p>
              <p className="text-xs text-[#888] mt-1">{c.label}</p>
            </Link>
          ))}
        </div>

        {/* Site Revenue Table */}
        <div className="bg-[#111] border border-[#DCE6F2] rounded-lg overflow-hidden">
          <div className="px-4 py-3 border-b border-[#DCE6F2]">
            <h2 className="text-sm font-semibold text-white">Revenue by Site</h2>
          </div>
          <table className="w-full text-sm">
            <thead>
              <tr className="border-b border-[#FFFFFF]">
                {['Site','Revenue MTD','Revenue YTD','Outstanding','Active Orders'].map(h => (
                  <th key={h} className="px-4 py-2 text-left text-xs text-[#555] font-medium">{h}</th>
                ))}
              </tr>
            </thead>
            <tbody>
              {siteRevenue.length === 0 ? (
                <tr><td colSpan={5} className="px-4 py-6 text-center text-[#555] text-xs">No data yet</td></tr>
              ) : siteRevenue.map((row: any) => (
                <tr key={row.site} className="border-b border-[#FFFFFF] hover:bg-[#FFFFFF]">
                  <td className="px-4 py-2 text-white font-medium capitalize">{row.site}</td>
                  <td className="px-4 py-2 text-green-400">{fmt(row.revenue_mtd ?? 0)}</td>
                  <td className="px-4 py-2 text-green-400">{fmt(row.revenue_ytd ?? 0)}</td>
                  <td className="px-4 py-2 text-yellow-400">{fmt(row.outstanding ?? 0)}</td>
                  <td className="px-4 py-2 text-[#ccc]">{row.active_orders ?? 0}</td>
                </tr>
              ))}
            </tbody>
          </table>
        </div>

        {/* Top Clients */}
        <div className="bg-[#111] border border-[#DCE6F2] rounded-lg overflow-hidden">
          <div className="px-4 py-3 border-b border-[#DCE6F2]">
            <h2 className="text-sm font-semibold text-white">Top 5 Clients YTD</h2>
          </div>
          <table className="w-full text-sm">
            <thead>
              <tr className="border-b border-[#FFFFFF]">
                {['Client','Revenue YTD','Active Orders'].map(h => (
                  <th key={h} className="px-4 py-2 text-left text-xs text-[#555] font-medium">{h}</th>
                ))}
              </tr>
            </thead>
            <tbody>
              {topClients.length === 0 ? (
                <tr><td colSpan={3} className="px-4 py-6 text-center text-[#555] text-xs">No data yet</td></tr>
              ) : topClients.map((c: any) => (
                <tr key={c.id} className="border-b border-[#FFFFFF] hover:bg-[#FFFFFF]">
                  <td className="px-4 py-2 text-white">{c.company_name}</td>
                  <td className="px-4 py-2 text-green-400">{fmt(c.revenue_ytd ?? 0)}</td>
                  <td className="px-4 py-2 text-[#ccc]">{c.active_orders ?? 0}</td>
                </tr>
              ))}
            </tbody>
          </table>
        </div>

        {/* Sub-nav links */}
        <div className="grid grid-cols-2 md:grid-cols-5 gap-2">
          {[
            { label: 'Clients', href: '/admin/accounting/clients' },
            { label: 'Orders', href: '/admin/accounting/orders' },
            { label: 'Invoices', href: '/admin/accounting/invoices' },
            { label: 'Staff & Commissions', href: '/admin/accounting/staff' },
            { label: 'Expenses', href: '/admin/accounting/expenses' },
            { label: 'Reconciliation', href: '/admin/accounting/reconciliation' },
            { label: 'Commissions', href: '/admin/accounting/commissions' },
            { label: 'Reports', href: '/admin/accounting/reports' },
            { label: 'Documents', href: '/admin/accounting/documents' },
          ].map(l => (
            <Link key={l.href} href={l.href} className="bg-[#111] border border-[#DCE6F2] rounded-lg p-3 text-center text-sm text-[#888] hover:text-white hover:border-[#1D4ED8] transition-colors">
              {l.label}
            </Link>
          ))}
        </div>
      </div>
    </div>
  );
}
