import React, { useMemo } from 'react';
import {
  Users,
  DollarSign,
  TrendingUp,
  Megaphone,
  Calendar,
  ChevronRight,
  ArrowUpRight,
  ArrowDownRight,
  Plus,
  Clock,
  ArrowRight
} from 'lucide-react';
import { PageHeader } from '../components/PageHeader.tsx';
import { useHybridBackend } from '../hooks/useHybridBackend.ts';
import { HybridBackend } from '../services/backend.ts';
import { NotificationCenter } from '../components/NotificationCenter.tsx';

const StatCard: React.FC<{
  title: string;
  value: string | number;
  icon: React.ReactNode;
  trend?: string;
  isPositive?: boolean;
  color: 'blue' | 'green' | 'purple' | 'amber';
  onClick?: () => void;
}> = ({ title, value, icon, trend, isPositive, color, onClick }) => {
  const bgLight = {
    blue: 'bg-teal-50 text-teal-600',
    green: 'bg-emerald-50 text-emerald-600',
    purple: 'bg-emerald-50 text-emerald-600',
    amber: 'bg-amber-50 text-amber-600'
  };

  return (
    <div
      onClick={onClick}
      className={`bg-white rounded-[2rem] p-8 border border-gray-100 shadow-[0_10px_40px_-15px_rgba(0,0,0,0.05)] hover:shadow-[0_20px_50px_-20px_rgba(0,0,0,0.1)] transition-all duration-500 group relative overflow-hidden ${onClick ? 'cursor-pointer' : ''}`}
    >
      <div className="absolute top-0 right-0 w-32 h-32 opacity-[0.03] -mr-8 -mt-8 rounded-full bg-current transform group-hover:scale-110 transition-transform duration-700"></div>

      <div className="flex justify-between items-start relative z-10">
        <div className="space-y-4">
          <div className={`w-12 h-12 ${bgLight[color]} rounded-2xl flex items-center justify-center mb-2 group-hover:scale-110 transition-transform`}>
            {icon}
          </div>
          <div>
            <p className="text-[10px] font-black text-gray-400 uppercase tracking-[0.2em]">{title}</p>
            <h3 className="text-3xl font-black text-gray-900 tracking-tight mt-1">{value}</h3>
          </div>
          {trend && (
            <div className={`flex items-center gap-1.5 text-xs font-bold ${isPositive ? 'text-emerald-600' : 'text-rose-600'}`}>
              <div className={`p-0.5 rounded-full ${isPositive ? 'bg-emerald-100' : 'bg-rose-100'}`}>
                {isPositive ? <ArrowUpRight size={12} /> : <ArrowDownRight size={12} />}
              </div>
              {trend}
            </div>
          )}
        </div>
      </div>
    </div>
  );
};

export const Dashboard: React.FC = () => {
  const { data, isLoading } = useHybridBackend<any>(HybridBackend.getDashboardStats);

  const growthData = useMemo(() => {
    if (!data?.growth || data.growth.length === 0) {
      return Array(6).fill(null).map((_, i) => ({
        label: `MÊS ${i + 1}`,
        receita: 0,
        despesa: 0,
        heightP: '0%',
        heightR: '0%'
      }));
    }

    const maxVal = Math.max(...data.growth.map((g: any) => Math.max(parseFloat(g.receita), parseFloat(g.despesa))), 1000);

    return data.growth.map((g: any) => {
      const [year, month] = g.mes.split('-');
      const date = new Date(parseInt(year), parseInt(month) - 1);
      const label = date.toLocaleString('pt-BR', { month: 'short' }).toUpperCase();

      return {
        label,
        receita: parseFloat(g.receita),
        despesa: parseFloat(g.despesa),
        // Proporção para o gráfico
        heightR: `${(parseFloat(g.receita) / maxVal) * 100}%`,
        heightD: `${(parseFloat(g.despesa) / maxVal) * 100}%`
      };
    }).slice(-6); // Garantir últimos 6
  }, [data]);

  const currentRole = HybridBackend.getCurrentRole();
  const showFinancials = ['admin', 'donoclinica', 'funcionario'].includes(currentRole);

  if (isLoading) {
    return (
      <div className="flex items-center justify-center h-96">
        <div className="w-12 h-12 border-4 border-teal-600 border-t-transparent rounded-full animate-spin"></div>
      </div>
    );
  }

  const stats = data?.stats || {
    totalPacientes: 0,
    totalAgendamentos: 0,
    totalLeads: 0,
    faturamentoTotal: 0,
    despesasTotal: 0
  };

  const recent = data?.recentAgendamentos || [];

  return (
    <div className="space-y-10 pb-10">
      <header className="flex flex-col md:flex-row md:items-end justify-between gap-6">
        <div>
          <PageHeader
            title="DASHBOARD ANALÍTICO"
            description="Informações consolidadas em tempo real da sua clínica."
          />
        </div>
        <div className="flex items-center gap-3">
          {(currentRole === 'admin' || currentRole === 'donoclinica' || currentRole === 'funcionario') && (
            <button
              onClick={() => history.pushState({}, '', '/relatorios')}
              className="bg-white text-gray-900 border border-gray-200 px-6 py-3 rounded-2xl text-xs font-black uppercase tracking-widest hover:bg-gray-50 transition-all flex items-center gap-2 shadow-sm"
            >
              <Clock size={16} /> Relatórios
            </button>
          )}
          {(currentRole === 'admin' || currentRole === 'donoclinica' || currentRole === 'funcionario') && (
            <button
              onClick={() => history.pushState({}, '', '/pacientes')}
              className="bg-teal-600 text-white px-6 py-3 rounded-2xl text-xs font-black uppercase tracking-widest hover:bg-teal-700 hover:shadow-xl hover:shadow-teal-200 transition-all flex items-center gap-2 shadow-lg shadow-teal-100"
            >
              <Plus size={16} /> Novo Paciente
            </button>
          )}
          <NotificationCenter />
        </div>
      </header>

      {/* Stats Grid */}
      <div className={`grid grid-cols-1 md:grid-cols-2 lg:grid-cols-${showFinancials ? '4' : '2'} gap-8`}>
        <StatCard
          title="Pacientes Ativos"
          value={stats.totalPacientes}
          icon={<Users size={24} />}
          trend="+12% este mês"
          isPositive={true}
          color="blue"
          onClick={() => history.pushState({}, '', '/pacientes')}
        />
        {showFinancials && (
          <StatCard
            title="Faturamento Bruto"
            value={new Intl.NumberFormat('pt-BR', { style: 'currency', currency: 'BRL' }).format(stats.faturamentoTotal)}
            icon={<DollarSign size={24} />}
            trend="+5.4% vs mês ant."
            isPositive={true}
            color="green"
            onClick={() => history.pushState({}, '', '/financeiro')}
          />
        )}
        <StatCard
          title="Agendamentos"
          value={stats.totalAgendamentos}
          icon={<Calendar size={24} />}
          trend="82% de ocupação"
          isPositive={true}
          color="purple"
          onClick={() => history.pushState({}, '', '/agenda')}
        />
        {showFinancials && (
          <StatCard
            title="Novas Leads"
            value={stats.totalLeads}
            icon={<Megaphone size={24} />}
            trend="-2% vs ontem"
            isPositive={false}
            color="amber"
            onClick={() => history.pushState({}, '', '/leads')}
          />
        )}
      </div>

      <div className={`grid lg:grid-cols-${showFinancials ? '3' : '1'} gap-8`}>
        {/* Growth Chart Area */}
        {showFinancials && (
          <div className="lg:col-span-2 bg-white rounded-[2.5rem] p-10 border border-gray-100 shadow-[0_20px_50px_-15px_rgba(0,0,0,0.03)]">
            <div className="flex justify-between items-center mb-10">
              <div>
                <h4 className="text-xl font-black text-gray-900 uppercase tracking-tighter italic">Crescimento Mensal</h4>
                <p className="text-xs font-bold text-gray-400 mt-1 uppercase">Receitas vs Despesas Reais</p>
              </div>
              <select
                id="chart-period-dashboard"
                name="chart-period"
                className="bg-gray-50 border-none text-[10px] font-black uppercase tracking-widest px-4 py-2 rounded-xl focus:ring-2 focus:ring-teal-100 cursor-pointer"
              >
                <option value="6m">Últimos 6 meses</option>
                <option value="year">Este Ano</option>
              </select>
            </div>

            <div className="h-64 flex items-end justify-between gap-4 px-4">
              {growthData.map((d: any, i: number) => (
                <div key={i} className="flex-1 flex flex-col items-center gap-3 group">
                  <div className="w-full flex justify-center gap-1 items-end h-[200px] bg-slate-50/50 rounded-2xl p-1">
                    {/* Barra Despesa */}
                    <div
                      title={`Despesa: R$ ${d.despesa}`}
                      className="w-1/3 bg-rose-200 rounded-lg group-hover:bg-rose-300 transition-all duration-500 origin-bottom"
                      style={{ height: d.heightD || '5%' }}
                    ></div>
                    {/* Barra Receita */}
                    <div
                      title={`Receita: R$ ${d.receita}`}
                      className="w-1/3 bg-teal-500 rounded-lg group-hover:bg-teal-600 shadow-sm group-hover:shadow-teal-200 transition-all duration-500 origin-bottom"
                      style={{ height: d.heightR || '5%' }}
                    ></div>
                  </div>
                  <span className="text-[10px] font-black text-gray-400 uppercase tracking-tighter">{d.label}</span>
                </div>
              ))}
            </div>
            <div className="flex justify-center gap-6 mt-6">
              <div className="flex items-center gap-2">
                <div className="w-3 h-3 bg-teal-500 rounded-sm"></div>
                <span className="text-[10px] font-bold text-gray-500 uppercase">Receitas</span>
              </div>
              <div className="flex items-center gap-2">
                <div className="w-3 h-3 bg-rose-200 rounded-sm"></div>
                <span className="text-[10px] font-bold text-gray-500 uppercase">Despesas</span>
              </div>
            </div>
          </div>
        )}

        {/* Recent Activity */}
        <div className="bg-gray-900 rounded-[2.5rem] p-10 shadow-2xl shadow-teal-200 overflow-hidden relative">
          <div className="absolute top-0 right-0 w-32 h-32 bg-teal-600/20 blur-[80px] rounded-full"></div>
          <div className="relative z-10 h-full flex flex-col">
            <h4 className="text-xl font-black text-white uppercase tracking-tighter italic mb-8">Últimos Agendamentos</h4>

            <div className="space-y-6 flex-1 overflow-y-auto custom-scrollbar pr-2">
              {recent.length > 0 ? recent.map((app: any) => (
                <div
                  key={app.id}
                  onClick={() => history.pushState({}, '', '/agenda')}
                  className="flex items-center gap-4 group cursor-pointer"
                >
                  <div className="w-12 h-12 rounded-2xl bg-white/10 flex items-center justify-center text-teal-400 group-hover:bg-teal-600 group-hover:text-white transition-all duration-300 flex-shrink-0">
                    <Calendar size={20} />
                  </div>
                  <div className="flex-1 min-w-0">
                    <div className="text-sm font-black text-white uppercase tracking-tight truncate">{app.pacientenome || 'Paciente'}</div>
                    <div className="text-[10px] font-bold text-gray-400 uppercase tracking-widest mt-0.5 truncate">
                      {app.dentistaNome || 'Profissional'} • {new Date(app.start_time).toLocaleDateString('pt-BR')} {new Date(app.start_time).toLocaleTimeString('pt-BR', { hour: '2-digit', minute: '2-digit' })}
                    </div>
                  </div>
                  <ChevronRight size={16} className="text-gray-600 group-hover:text-white group-hover:translate-x-1 transition-all" />
                </div>
              )) : (
                <div className="flex flex-col items-center justify-center py-10 opacity-40">
                  <Calendar size={40} className="text-white mb-2" />
                  <p className="text-white text-[10px] font-bold uppercase tracking-widest">Nenhum agendamento recente.</p>
                </div>
              )}
            </div>

            <button
              onClick={() => history.pushState({}, '', '/agenda')}
              className="w-full mt-8 bg-white/5 border border-white/10 text-white py-4 rounded-2xl text-[10px] font-black uppercase tracking-widest hover:bg-white/10 transition-all flex items-center justify-center gap-2 group"
            >
              Ver Agenda Completa <ArrowRight size={14} className="group-hover:translate-x-1 transition-transform" />
            </button>
          </div>
        </div>
      </div>
    </div>
  );
};