"use client";

import { useState, useEffect } from "react";
import {
  LayoutGrid,
  TrendingUp,
  CheckCircle2,
  DollarSign,
  Clock,
  Calendar,
  Users,
  Target,
  PiggyBank,
  AlertCircle,
  BarChart3,
  Lock,
} from "lucide-react";
import {
  PieChart,
  Pie,
  Cell,
  ResponsiveContainer,
  BarChart,
  Bar,
  XAxis,
  YAxis,
  Tooltip,
  Legend,
  RadialBarChart,
  RadialBar,
  CartesianGrid,
} from "recharts";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
import { Skeleton } from "@/components/ui/skeleton";
import { Badge } from "@/components/ui/badge";
import { getProjects } from "@/lib/projectsService";
import { Project } from "@/types/project";

// Colores consistentes
const COLORS = {
  primary: "#3b82f6",
  secondary: "#8b5cf6",
  success: "#22c55e",
  warning: "#f59e0b",
  danger: "#ef4444",
  gray: "#6b7280",
  orange: "#f97316",
  cyan: "#06b6d4",
};

const PROGRESS_COLORS = ["#ef4444", "#f97316", "#f59e0b", "#22c55e"];

// Paleta de colores para proyectos individuales (variada y distinguible)
const PROJECT_COLORS = [
  "#3b82f6", // blue
  "#8b5cf6", // violet
  "#06b6d4", // cyan
  "#10b981", // emerald
  "#f59e0b", // amber
  "#ef4444", // red
  "#ec4899", // pink
  "#6366f1", // indigo
  "#14b8a6", // teal
  "#f97316", // orange
  "#84cc16", // lime
  "#a855f7", // purple
];

// Obtener color por índice (cíclico)
function getProjectColor(index: number): string {
  return PROJECT_COLORS[index % PROJECT_COLORS.length];
}

// ==================== COMPONENTES DE CARDS ====================
interface StatCardProps {
  title: string;
  value: string | number;
  subtitle?: string;
  icon: React.ReactNode;
  highlight?: boolean;
}

function StatCard({ title, value, subtitle, icon, highlight }: StatCardProps) {
  return (
    <Card className={`border hover:shadow-md transition-shadow ${highlight ? "ring-2 ring-blue-500/20" : ""}`}>
      <CardHeader className="flex flex-row items-center justify-between pb-2">
        <CardTitle className="text-sm font-medium text-muted-foreground">{title}</CardTitle>
        {icon}
      </CardHeader>
      <CardContent>
        <div className="text-3xl font-bold text-foreground">{value}</div>
        {subtitle && <p className="text-xs text-muted-foreground mt-1">{subtitle}</p>}
      </CardContent>
    </Card>
  );
}

// ==================== COMPONENTES DE GRAFICOS ====================

// Pie Chart de distribucion por estado
interface StatusPieChartProps {
  borradores: number;
  abiertos: number;
  cerrados: number;
}

function StatusPieChart({ borradores, abiertos, cerrados }: StatusPieChartProps) {
  const data = [
    { name: "Borrador", value: borradores, color: COLORS.gray },
    { name: "Abierto", value: abiertos, color: COLORS.primary },
    { name: "Cerrado", value: cerrados, color: COLORS.success },
  ].filter(d => d.value > 0);

  const total = borradores + abiertos + cerrados;

  return (
    <Card className="border">
      <CardHeader className="pb-2">
        <CardTitle className="text-sm font-medium text-muted-foreground">Distribucion por Estado</CardTitle>
      </CardHeader>
      <CardContent>
        <div className="h-64 relative">
          <ResponsiveContainer width="100%" height="100%">
            <PieChart>
              <Pie
                data={data}
                cx="50%"
                cy="50%"
                innerRadius={50}
                outerRadius={80}
                paddingAngle={3}
                dataKey="value"
              >
                {data.map((entry, index) => (
                  <Cell key={`cell-${index}`} fill={entry.color} />
                ))}
              </Pie>
              <Tooltip 
                formatter={(value) => [`${value ?? 0} proyectos`, '']}
                contentStyle={{ fontSize: '12px' }}
              />
            </PieChart>
          </ResponsiveContainer>
          <div className="absolute inset-0 flex items-center justify-center pointer-events-none">
            <div className="text-center">
              <p className="text-2xl font-bold text-foreground">{total}</p>
              <p className="text-xs text-muted-foreground">Total</p>
            </div>
          </div>
        </div>
        <div className="flex justify-center gap-4 mt-2">
          {data.map((entry) => (
            <div key={entry.name} className="flex items-center gap-1.5">
              <div className="w-3 h-3 rounded-full" style={{ backgroundColor: entry.color }} />
              <span className="text-xs text-muted-foreground">{entry.name}: {entry.value}</span>
            </div>
          ))}
        </div>
      </CardContent>
    </Card>
  );
}

// Donut Chart para progreso
interface ProgressDonutProps {
  data: { name: string; value: number; color: string }[];
  title: string;
  centerValue?: string | number;
  centerLabel?: string;
}

function ProgressDonut({ data, title, centerValue, centerLabel }: ProgressDonutProps) {
  return (
    <Card className="border">
      <CardHeader className="pb-2">
        <CardTitle className="text-sm font-medium text-muted-foreground">{title}</CardTitle>
      </CardHeader>
      <CardContent>
        <div className="h-64 relative">
          <ResponsiveContainer width="100%" height="100%">
            <PieChart>
              <Pie
                data={data}
                cx="50%"
                cy="50%"
                innerRadius={55}
                outerRadius={85}
                paddingAngle={2}
                dataKey="value"
              >
                {data.map((entry, index) => (
                  <Cell key={`cell-${index}`} fill={entry.color} />
                ))}
              </Pie>
              <Tooltip 
                formatter={(value) => [`${value ?? 0} proyectos`, '']}
                contentStyle={{ fontSize: '12px' }}
              />
            </PieChart>
          </ResponsiveContainer>
          {centerValue !== undefined && (
            <div className="absolute inset-0 flex items-center justify-center pointer-events-none">
              <div className="text-center">
                <p className="text-2xl font-bold text-foreground">{centerValue}</p>
                {centerLabel && <p className="text-xs text-muted-foreground">{centerLabel}</p>}
              </div>
            </div>
          )}
        </div>
        <div className="flex flex-wrap justify-center gap-3 mt-2">
          {data.map((entry) => (
            <div key={entry.name} className="flex items-center gap-1.5">
              <div className="w-3 h-3 rounded-full" style={{ backgroundColor: entry.color }} />
              <span className="text-xs text-muted-foreground">{entry.name}</span>
            </div>
          ))}
        </div>
      </CardContent>
    </Card>
  );
}

// Radial Bar Chart para metricas
// Bar Chart horizontal para presupuestos por proyecto
interface BudgetBarChartProps {
  projects: Project[];
  title: string;
  maxItems?: number;
}

function BudgetBarChart({ projects, title, maxItems = 6 }: BudgetBarChartProps) {
  const data = projects
    .slice(0, maxItems)
    .map((p, index) => ({
      name: p.name.length > 15 ? p.name.substring(0, 15) + "..." : p.name,
      fullName: p.name,
      presupuesto: p.budget,
      gastado: p.spent,
      color: getProjectColor(index),
    }));

  return (
    <Card className="border">
      <CardHeader className="pb-2">
        <CardTitle className="text-sm font-medium text-muted-foreground">{title}</CardTitle>
      </CardHeader>
      <CardContent>
        <div className="h-72">
          <ResponsiveContainer width="100%" height="100%">
            <BarChart data={data} layout="vertical" margin={{ left: 10, right: 20 }}>
              <CartesianGrid strokeDasharray="3 3" horizontal={false} />
              <XAxis type="number" tickFormatter={(v) => `${(v / 1000).toFixed(0)}k`} fontSize={11} />
              <YAxis type="category" dataKey="name" width={100} fontSize={10} />
              <Tooltip 
                formatter={(value, name) => {
                  const label = name === 'presupuesto' ? 'Presupuesto' : name === 'gastado' ? 'Gastado' : String(name);
                  return [`€${Number(value ?? 0).toLocaleString("es-ES")}`, label];
                }}
                labelFormatter={(label, payload) => payload?.[0]?.payload?.fullName || label}
                contentStyle={{ fontSize: '12px' }}
              />
              <Legend wrapperStyle={{ fontSize: '11px' }} />
              <Bar dataKey="presupuesto" name="Presupuesto" radius={[0, 4, 4, 0]}>
                {data.map((entry, index) => (
                  <Cell key={`cell-budget-${index}`} fill={entry.color} />
                ))}
              </Bar>
              <Bar dataKey="gastado" name="Gastado" radius={[0, 4, 4, 0]}>
                {data.map((entry, index) => (
                  <Cell key={`cell-spent-${index}`} fill={entry.color} fillOpacity={0.5} />
                ))}
              </Bar>
            </BarChart>
          </ResponsiveContainer>
        </div>
      </CardContent>
    </Card>
  );
}

// Multi Radial para comparar metricas
interface MultiRadialProps {
  data: { name: string; value: number; fill: string }[];
  title: string;
  valueLabel?: string;
}

function MultiRadialChart({ data, title, valueLabel = "%" }: MultiRadialProps) {
  // Asignar colores únicos a cada proyecto
  const coloredData = data.map((item, index) => ({
    ...item,
    fill: getProjectColor(index),
  }));

  return (
    <Card className="border">
      <CardHeader className="pb-2">
        <CardTitle className="text-sm font-medium text-muted-foreground">{title}</CardTitle>
      </CardHeader>
      <CardContent>
        <div className="h-64">
          <ResponsiveContainer width="100%" height="100%">
            <RadialBarChart
              cx="50%"
              cy="50%"
              innerRadius="20%"
              outerRadius="90%"
              data={coloredData}
              startAngle={90}
              endAngle={-270}
            >
              <RadialBar
                background={{ fill: "hsl(var(--muted))" }}
                dataKey="value"
                cornerRadius={5}
              />
              <Tooltip 
                formatter={(value) => [`${value ?? 0}${valueLabel}`, '']}
                contentStyle={{ fontSize: '12px' }}
              />
              <Legend
                iconSize={10}
                layout="vertical"
                verticalAlign="middle"
                align="right"
                wrapperStyle={{ fontSize: "10px", right: 0 }}
              />
            </RadialBarChart>
          </ResponsiveContainer>
        </div>
      </CardContent>
    </Card>
  );
}

// ==================== FUNCIONES HELPER ====================
function calculateStats(projects: Project[]) {
  const total = projects.length;
  if (total === 0) {
    return {
      total: 0, avgProgress: 0, totalBudget: 0, totalSpent: 0,
      avgBudget: 0, budgetConsumed: 0, uniqueClients: 0, avgDuration: 0,
    };
  }

  const totalBudget = projects.reduce((acc, p) => acc + p.budget, 0);
  const totalSpent = projects.reduce((acc, p) => acc + p.spent, 0);
  const avgProgress = Math.round(projects.reduce((acc, p) => acc + p.progress, 0) / total);
  const avgBudget = Math.round(totalBudget / total);
  const budgetConsumed = totalBudget > 0 ? Math.round((totalSpent / totalBudget) * 100) : 0;
  const uniqueClients = new Set(projects.map((p) => p.client)).size;

  const durations = projects
    .map((p) => {
      const start = new Date(p.startDate).getTime();
      const end = new Date(p.endDate).getTime();
      if (isNaN(start) || isNaN(end)) return null;
      return Math.ceil((end - start) / (1000 * 60 * 60 * 24));
    })
    .filter((d): d is number => d !== null && d > 0);
  const avgDuration = durations.length > 0 ? Math.round(durations.reduce((a, b) => a + b, 0) / durations.length) : 0;

  return { total, avgProgress, totalBudget, totalSpent, avgBudget, budgetConsumed, uniqueClients, avgDuration };
}

function formatCurrency(value: number): string {
  if (value >= 1000000) return `€${(value / 1000000).toFixed(1)}M`;
  if (value >= 1000) return `€${(value / 1000).toFixed(0)}k`;
  return `€${value.toLocaleString("es-ES")}`;
}

// Calcular días restantes hasta fecha fin
function getDaysRemaining(endDate: string): number {
  const end = new Date(endDate).getTime();
  const now = new Date().getTime();
  return Math.ceil((end - now) / (1000 * 60 * 60 * 24));
}

// Proyectos próximos a vencer (menos de 30 días)
function getUpcomingDeadlines(projects: Project[], days: number = 30): Project[] {
  return projects
    .filter(p => p.status === "1" && p.progress < 100)
    .filter(p => {
      const remaining = getDaysRemaining(p.endDate);
      return remaining > 0 && remaining <= days;
    })
    .sort((a, b) => getDaysRemaining(a.endDate) - getDaysRemaining(b.endDate));
}

// Proyectos retrasados (fecha fin pasada pero no completados)
function getOverdueProjects(projects: Project[]): Project[] {
  return projects
    .filter(p => p.status === "1" && p.progress < 100)
    .filter(p => getDaysRemaining(p.endDate) < 0)
    .sort((a, b) => getDaysRemaining(a.endDate) - getDaysRemaining(b.endDate));
}

// ==================== PANEL: TODOS LOS PROYECTOS ====================
function AllProjectsStats({ projects }: { projects: Project[] }) {
  const stats = calculateStats(projects);
  const borradores = projects.filter(p => p.status === "0").length;
  const abiertos = projects.filter(p => p.status === "1").length;
  const cerrados = projects.filter(p => p.status === "2").length;

  const overdueProjects = getOverdueProjects(projects);
  const upcomingDeadlines = getUpcomingDeadlines(projects, 14);

  const progressData = [
    { name: "0-25%", value: projects.filter(p => p.progress < 25).length, color: PROGRESS_COLORS[0] },
    { name: "25-50%", value: projects.filter(p => p.progress >= 25 && p.progress < 50).length, color: PROGRESS_COLORS[1] },
    { name: "50-75%", value: projects.filter(p => p.progress >= 50 && p.progress < 75).length, color: PROGRESS_COLORS[2] },
    { name: "75-100%", value: projects.filter(p => p.progress >= 75).length, color: PROGRESS_COLORS[3] },
  ];

  return (
    <div className="space-y-6">
      {/* KPIs principales */}
      <div className="grid grid-cols-2 md:grid-cols-4 gap-4">
        <StatCard
          title="Total Proyectos"
          value={stats.total}
          subtitle={`${abiertos} activos, ${cerrados} cerrados`}
          icon={<LayoutGrid className="w-4 h-4 text-gray-400" />}
          highlight
        />
        <StatCard
          title="Presupuesto Total"
          value={formatCurrency(stats.totalBudget)}
          subtitle={`Gastado: ${formatCurrency(stats.totalSpent)}`}
          icon={<DollarSign className="w-4 h-4 text-green-500" />}
        />
        <StatCard
          title="Progreso Medio"
          value={`${stats.avgProgress}%`}
          subtitle={`${stats.uniqueClients} clientes`}
          icon={<TrendingUp className="w-4 h-4 text-blue-500" />}
        />
        <StatCard
          title="Requieren Atencion"
          value={overdueProjects.length}
          subtitle={overdueProjects.length > 0 ? "Proyectos retrasados" : "Todo en orden"}
          icon={<AlertCircle className={`w-4 h-4 ${overdueProjects.length > 0 ? "text-red-500" : "text-green-500"}`} />}
        />
      </div>

      {/* Graficos: Estado + Progreso */}
      <div className="grid grid-cols-1 lg:grid-cols-2 gap-4">
        <StatusPieChart borradores={borradores} abiertos={abiertos} cerrados={cerrados} />
        <ProgressDonut
          data={progressData}
          title="Distribucion por Progreso"
          centerValue={`${stats.avgProgress}%`}
          centerLabel="Promedio"
        />
      </div>

      {/* Presupuesto por proyecto */}
      <BudgetBarChart
        projects={[...projects].sort((a, b) => b.budget - a.budget)}
        title="Presupuesto vs Gastado por Proyecto"
        maxItems={8}
      />

      {/* Alertas: retrasados y proximos a vencer */}
      {(overdueProjects.length > 0 || upcomingDeadlines.length > 0) && (
        <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
          {overdueProjects.length > 0 && (
            <Card className="border-red-200 dark:border-red-900">
              <CardHeader className="pb-3">
                <CardTitle className="text-sm font-medium text-red-700 dark:text-red-400 flex items-center gap-2">
                  <AlertCircle className="w-4 h-4" />
                  Retrasados ({overdueProjects.length})
                </CardTitle>
              </CardHeader>
              <CardContent className="pt-0">
                <div className="space-y-2">
                  {overdueProjects.slice(0, 4).map(p => {
                    const daysOverdue = Math.abs(getDaysRemaining(p.endDate));
                    return (
                      <div key={p.id} className="flex items-center justify-between gap-2 p-2 rounded-md bg-red-50 dark:bg-red-950/20">
                        <div className="flex-1 min-w-0">
                          <p className="text-sm font-medium truncate">{p.name}</p>
                          <p className="text-xs text-muted-foreground">{p.progress}%</p>
                        </div>
                        <Badge variant="outline" className="border-red-300 dark:border-red-700 text-red-600 dark:text-red-400 text-xs shrink-0">
                          -{daysOverdue}d
                        </Badge>
                      </div>
                    );
                  })}
                </div>
              </CardContent>
            </Card>
          )}
          {upcomingDeadlines.length > 0 && (
            <Card className="border-amber-200 dark:border-amber-900">
              <CardHeader className="pb-3">
                <CardTitle className="text-sm font-medium text-amber-700 dark:text-amber-400 flex items-center gap-2">
                  <Clock className="w-4 h-4" />
                  Proximos a vencer ({upcomingDeadlines.length})
                </CardTitle>
              </CardHeader>
              <CardContent className="pt-0">
                <div className="space-y-2">
                  {upcomingDeadlines.slice(0, 4).map(p => {
                    const days = getDaysRemaining(p.endDate);
                    return (
                      <div key={p.id} className="flex items-center justify-between gap-2 p-2 rounded-md bg-amber-50 dark:bg-amber-950/20">
                        <div className="flex-1 min-w-0">
                          <p className="text-sm font-medium truncate">{p.name}</p>
                          <p className="text-xs text-muted-foreground">{p.progress}%</p>
                        </div>
                        <Badge
                          variant="outline"
                          className={`text-xs shrink-0 ${
                            days <= 3
                              ? "border-red-300 dark:border-red-700 text-red-600 dark:text-red-400"
                              : "border-amber-300 dark:border-amber-700 text-amber-600 dark:text-amber-400"
                          }`}
                        >
                          {days}d
                        </Badge>
                      </div>
                    );
                  })}
                </div>
              </CardContent>
            </Card>
          )}
        </div>
      )}
    </div>
  );
}

// ==================== PANEL: PROYECTOS ACTIVOS ====================
function ActiveProjectsStats({ projects }: { projects: Project[] }) {
  const activeProjects = projects.filter(p => p.status === "1" && p.progress < 100);
  const stats = calculateStats(activeProjects);

  if (activeProjects.length === 0) {
    return (
      <div className="flex flex-col items-center justify-center py-16">
        <TrendingUp className="w-16 h-16 text-muted-foreground/50 mb-4" />
        <h3 className="text-xl font-semibold text-foreground">No hay proyectos activos</h3>
        <p className="text-muted-foreground mt-2">Todos los proyectos están cerrados o en borrador</p>
      </div>
    );
  }

  const overdueProjects = getOverdueProjects(projects);
  const upcomingDeadlines = getUpcomingDeadlines(projects, 14);
  const needsAttention = activeProjects.filter(p => p.progress < 25).length;
  const nearCompletion = activeProjects.filter(p => p.progress >= 75).length;

  const progressData = [
    { name: "Inicio (0-25%)", value: activeProjects.filter(p => p.progress < 25).length, color: PROGRESS_COLORS[0] },
    { name: "En curso (25-50%)", value: activeProjects.filter(p => p.progress >= 25 && p.progress < 50).length, color: PROGRESS_COLORS[1] },
    { name: "Avanzado (50-75%)", value: activeProjects.filter(p => p.progress >= 50 && p.progress < 75).length, color: PROGRESS_COLORS[2] },
    { name: "Casi listo (75-99%)", value: activeProjects.filter(p => p.progress >= 75).length, color: PROGRESS_COLORS[3] },
  ];

  return (
    <div className="space-y-6">
      {/* KPIs */}
      <div className="grid grid-cols-2 md:grid-cols-4 gap-4">
        <StatCard title="Proyectos Activos" value={stats.total} subtitle="En progreso" icon={<TrendingUp className="w-4 h-4 text-blue-500" />} highlight />
        <StatCard title="Presupuesto Activo" value={formatCurrency(stats.totalBudget)} subtitle={`${stats.budgetConsumed}% consumido`} icon={<DollarSign className="w-4 h-4 text-green-500" />} />
        <StatCard title="Progreso Medio" value={`${stats.avgProgress}%`} subtitle={`${nearCompletion} casi listos`} icon={<Target className="w-4 h-4 text-purple-500" />} />
        <StatCard title="Requieren Atención" value={overdueProjects.length + needsAttention} subtitle={`${overdueProjects.length} retrasados, ${needsAttention} < 25%`} icon={<AlertCircle className="w-4 h-4 text-red-500" />} />
      </div>

      {/* Gráficos */}
      <div className="grid grid-cols-1 lg:grid-cols-2 gap-4">
        <ProgressDonut data={progressData} title="Estado de Avance" centerValue={stats.total} centerLabel="Activos" />
        <BudgetBarChart projects={activeProjects.sort((a, b) => b.budget - a.budget)} title="Presupuesto vs Gastado" maxItems={6} />
      </div>

      {/* Próximos vencimientos */}
      {upcomingDeadlines.length > 0 && (
        <Card className="border">
          <CardHeader className="pb-2">
            <CardTitle className="text-sm font-medium text-muted-foreground flex items-center gap-2">
              <Calendar className="w-4 h-4" /> Próximos Vencimientos (14 días)
            </CardTitle>
          </CardHeader>
          <CardContent>
            <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-3">
              {upcomingDeadlines.slice(0, 6).map((p, index) => {
                const days = getDaysRemaining(p.endDate);
                return (
                  <div key={p.id} className="flex items-center gap-3 p-3 bg-muted/50 rounded-lg">
                    <div className="w-2 h-2 rounded-full" style={{ backgroundColor: getProjectColor(index) }} />
                    <div className="flex-1 min-w-0">
                      <p className="text-sm font-medium text-foreground truncate">{p.name}</p>
                      <p className="text-xs text-muted-foreground">{p.progress}% completado</p>
                    </div>
                    <Badge variant="outline" className={days <= 3 ? 'border-red-300 dark:border-red-700 text-red-600 dark:text-red-400' : days <= 7 ? 'border-amber-300 dark:border-amber-700 text-amber-600 dark:text-amber-400' : ''}>
                      {days}d
                    </Badge>
                  </div>
                );
              })}
            </div>
          </CardContent>
        </Card>
      )}
    </div>
  );
}

// ==================== PANEL: PROYECTOS CERRADOS ====================
function ClosedProjectsStats({ projects }: { projects: Project[] }) {
  const closedProjects = projects.filter(p => p.status === "2");
  const stats = calculateStats(closedProjects);

  if (closedProjects.length === 0) {
    return (
      <div className="flex flex-col items-center justify-center py-16">
        <Lock className="w-16 h-16 text-muted-foreground/50 mb-4" />
        <h3 className="text-xl font-semibold text-foreground">No hay proyectos cerrados</h3>
        <p className="text-muted-foreground mt-2">Aún no se ha cerrado ningún proyecto</p>
      </div>
    );
  }

  const withinBudget = closedProjects.filter(p => p.spent <= p.budget).length;
  const overBudget = closedProjects.filter(p => p.spent > p.budget).length;
  const fullyCompleted = closedProjects.filter(p => p.progress >= 100).length;
  const savings = Math.max(0, stats.totalBudget - stats.totalSpent);

  const budgetComplianceData = [
    { name: "Dentro presupuesto", value: withinBudget, color: COLORS.success },
    { name: "Sobre presupuesto", value: overBudget, color: COLORS.danger },
  ].filter(d => d.value > 0);

  // Distribución de duración de los proyectos cerrados
  const durationRanges = closedProjects.reduce(
    (acc, p) => {
      const start = new Date(p.startDate);
      const end = new Date(p.endDate);
      const months = (end.getTime() - start.getTime()) / (1000 * 60 * 60 * 24 * 30.44);
      if (months < 3) acc.short++;
      else if (months < 6) acc.medium++;
      else if (months < 12) acc.long++;
      else acc.veryLong++;
      return acc;
    },
    { short: 0, medium: 0, long: 0, veryLong: 0 }
  );

  const durationData = [
    { name: "< 3 meses", value: durationRanges.short, color: COLORS.success },
    { name: "3-6 meses", value: durationRanges.medium, color: COLORS.primary },
    { name: "6-12 meses", value: durationRanges.long, color: COLORS.warning },
    { name: "> 12 meses", value: durationRanges.veryLong, color: COLORS.danger },
  ].filter(d => d.value > 0);

  // Eficiencia por proyecto con colores únicos
  const efficiencyData = closedProjects
    .slice(0, 5)
    .map((p, index) => {
      const efficiency = p.budget > 0 ? Math.round(((p.budget - p.spent) / p.budget) * 100) : 0;
      return {
        name: p.name.length > 12 ? p.name.substring(0, 12) + "..." : p.name,
        value: Math.max(0, Math.min(efficiency, 100)),
        fill: getProjectColor(index),
      };
    });

  return (
    <div className="space-y-6">
      {/* KPIs */}
      <div className="grid grid-cols-2 md:grid-cols-4 gap-4">
        <StatCard title="Proyectos Cerrados" value={stats.total} subtitle={`${fullyCompleted} al 100%`} icon={<Lock className="w-4 h-4 text-gray-500" />} highlight />
        <StatCard title="Presupuesto Gestionado" value={formatCurrency(stats.totalBudget)} subtitle={`Gastado: ${formatCurrency(stats.totalSpent)}`} icon={<DollarSign className="w-4 h-4 text-green-500" />} />
        <StatCard title="Tasa de Éxito" value={`${stats.total > 0 ? Math.round((withinBudget / stats.total) * 100) : 0}%`} subtitle={`${withinBudget} dentro de presupuesto`} icon={<CheckCircle2 className="w-4 h-4 text-green-500" />} />
        <StatCard title="Ahorro Total" value={formatCurrency(savings)} subtitle={`${100 - stats.budgetConsumed}% no usado`} icon={<PiggyBank className="w-4 h-4 text-emerald-500" />} />
      </div>

      {/* Cumplimiento visual */}
      <div className="grid grid-cols-1 md:grid-cols-2 gap-4">
        <Card className="border-green-200 dark:border-green-900 bg-gradient-to-br from-green-50 to-emerald-50 dark:from-green-950/30 dark:to-emerald-950/30">
          <CardContent className="py-6">
            <div className="flex items-center gap-6">
              <div className="p-4 bg-green-100 dark:bg-green-900/50 rounded-full">
                <CheckCircle2 className="w-8 h-8 text-green-600 dark:text-green-400" />
              </div>
              <div>
                <p className="text-sm font-medium text-green-700 dark:text-green-400">Dentro del Presupuesto</p>
                <p className="text-4xl font-bold text-green-600 dark:text-green-400">{withinBudget}</p>
                <p className="text-sm text-green-600 dark:text-green-400">{stats.total > 0 ? Math.round((withinBudget / stats.total) * 100) : 0}% de los cerrados</p>
              </div>
            </div>
          </CardContent>
        </Card>
        <Card className={`${overBudget > 0 ? 'border-red-200 dark:border-red-900 bg-gradient-to-br from-red-50 to-orange-50 dark:from-red-950/30 dark:to-orange-950/30' : 'border bg-muted/30'}`}>
          <CardContent className="py-6">
            <div className="flex items-center gap-6">
              <div className={`p-4 rounded-full ${overBudget > 0 ? 'bg-red-100 dark:bg-red-900/50' : 'bg-muted'}`}>
                <AlertCircle className={`w-8 h-8 ${overBudget > 0 ? 'text-red-600 dark:text-red-400' : 'text-muted-foreground/50'}`} />
              </div>
              <div>
                <p className={`text-sm font-medium ${overBudget > 0 ? 'text-red-700 dark:text-red-400' : 'text-muted-foreground'}`}>Excedieron Presupuesto</p>
                <p className={`text-4xl font-bold ${overBudget > 0 ? 'text-red-600 dark:text-red-400' : 'text-muted-foreground/50'}`}>{overBudget}</p>
                <p className={`text-sm ${overBudget > 0 ? 'text-red-600 dark:text-red-400' : 'text-muted-foreground/50'}`}>{stats.total > 0 ? Math.round((overBudget / stats.total) * 100) : 0}% de los cerrados</p>
              </div>
            </div>
          </CardContent>
        </Card>
      </div>

      {/* Gráficos */}
      <div className="grid grid-cols-1 lg:grid-cols-2 gap-4">
        <ProgressDonut data={budgetComplianceData} title="Cumplimiento Presupuestario" centerValue={`${stats.total > 0 ? Math.round((withinBudget / stats.total) * 100) : 0}%`} centerLabel="Éxito" />
        <ProgressDonut data={durationData} title="Duración de Proyectos" centerValue={closedProjects.length} centerLabel="Proyectos" />
      </div>

      {/* Eficiencia por proyecto */}
      <div className="grid grid-cols-1 lg:grid-cols-2 gap-4">
        <MultiRadialChart data={efficiencyData} title="Eficiencia por Proyecto (% Ahorrado)" valueLabel="%" />
        <BudgetBarChart projects={closedProjects.sort((a, b) => b.budget - a.budget)} title="Presupuesto vs Gastado" maxItems={5} />
      </div>
    </div>
  );
}

// ==================== PANEL: PROYECTOS COMPLETADOS ====================
function CompletedProjectsStats({ projects }: { projects: Project[] }) {
  const completedProjects = projects.filter(p => p.progress >= 100);
  const stats = calculateStats(completedProjects);

  if (completedProjects.length === 0) {
    return (
      <div className="flex flex-col items-center justify-center py-16">
        <CheckCircle2 className="w-16 h-16 text-muted-foreground/50 mb-4" />
        <h3 className="text-xl font-semibold text-foreground">No hay proyectos completados</h3>
        <p className="text-muted-foreground mt-2">Aún no se ha completado ningún proyecto al 100%</p>
      </div>
    );
  }

  const withinBudget = completedProjects.filter(p => p.spent <= p.budget).length;
  const savings = Math.max(0, stats.totalBudget - stats.totalSpent);
  const successRate = stats.total > 0 ? Math.round((withinBudget / stats.total) * 100) : 0;

  const statusData = [
    { name: "Abierto (pendiente cierre)", value: completedProjects.filter(p => p.status === "1").length, color: COLORS.primary },
    { name: "Cerrado", value: completedProjects.filter(p => p.status === "2").length, color: COLORS.success },
  ].filter(d => d.value > 0);

  return (
    <div className="space-y-6">
      {/* KPIs */}
      <div className="grid grid-cols-2 md:grid-cols-4 gap-4">
        <StatCard title="Completados" value={stats.total} subtitle="Proyectos al 100%" icon={<CheckCircle2 className="w-4 h-4 text-green-500" />} highlight />
        <StatCard title="Presupuesto Total" value={formatCurrency(stats.totalBudget)} subtitle={`Gastado: ${formatCurrency(stats.totalSpent)}`} icon={<DollarSign className="w-4 h-4 text-green-500" />} />
        <StatCard title="Tasa de Éxito" value={`${successRate}%`} subtitle={`${withinBudget} dentro de presupuesto`} icon={<Target className="w-4 h-4 text-emerald-500" />} />
        <StatCard title="Ahorro Total" value={formatCurrency(savings)} subtitle={`${100 - stats.budgetConsumed}% no usado`} icon={<PiggyBank className="w-4 h-4 text-blue-500" />} />
      </div>

      {/* Gráficos */}
      <div className="grid grid-cols-1 lg:grid-cols-2 gap-4">
        <ProgressDonut data={statusData} title="Estado Administrativo" centerValue={stats.total} centerLabel="Completados" />
        <BudgetBarChart projects={completedProjects.sort((a, b) => b.budget - a.budget)} title="Presupuesto vs Gastado" maxItems={6} />
      </div>
    </div>
  );
}

// ==================== SKELETON ====================
function StatisticsSkeleton() {
  return (
    <div className="space-y-6">
      <div className="grid grid-cols-2 md:grid-cols-4 gap-4">
        {Array.from({ length: 4 }).map((_, i) => (
          <Card key={i} className="border">
            <CardHeader className="pb-2"><Skeleton className="h-4 w-24" /></CardHeader>
            <CardContent><Skeleton className="h-8 w-16 mb-2" /><Skeleton className="h-3 w-32" /></CardContent>
          </Card>
        ))}
      </div>
      <div className="grid grid-cols-1 lg:grid-cols-3 gap-4">
        {Array.from({ length: 3 }).map((_, i) => (
          <Card key={i} className="border">
            <CardHeader className="pb-2"><Skeleton className="h-4 w-32" /></CardHeader>
            <CardContent><Skeleton className="h-64 w-full" /></CardContent>
          </Card>
        ))}
      </div>
    </div>
  );
}

// ==================== COMPONENTE PRINCIPAL ====================
export default function StatisticsPage() {
  const [projects, setProjects] = useState<Project[]>([]);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);

  useEffect(() => {
    async function loadProjects() {
      try {
        setLoading(true);
        const data = await getProjects();
        setProjects(data);
        setError(null);
      } catch (err) {
        console.error("Error loading projects:", err);
        setError("Error al cargar los proyectos");
      } finally {
        setLoading(false);
      }
    }
    loadProjects();
  }, []);

  if (error) {
    return (
      <div className="min-h-screen bg-background flex items-center justify-center">
        <div className="text-center">
          <AlertCircle className="w-16 h-16 text-red-400 dark:text-red-500 mx-auto mb-4" />
          <p className="text-red-600 dark:text-red-400 text-lg">{error}</p>
          <button onClick={() => window.location.reload()} className="mt-4 px-4 py-2 bg-blue-600 text-white rounded-lg hover:bg-blue-700">
            Reintentar
          </button>
        </div>
      </div>
    );
  }

  const activeCount = projects.filter(p => p.status === "1" && p.progress < 100).length;
  const closedCount = projects.filter(p => p.status === "2").length;
  const completedCount = projects.filter(p => p.progress >= 100).length;

  return (
    <div className="min-h-screen bg-background">
      <header className="bg-card border-b sticky top-0 z-10">
        <div className="px-6 py-6">
          <div className="flex items-center gap-3">
            <div className="p-2 bg-gradient-to-r from-blue-500 to-purple-600 rounded-lg">
              <BarChart3 className="w-6 h-6 text-white" />
            </div>
            <div>
              <h1 className="text-2xl font-bold text-foreground">Estadisticas</h1>
              <p className="text-sm text-muted-foreground">Analisis de {projects.length} proyectos en Dolibarr</p>
            </div>
          </div>
        </div>
      </header>

      <main className="px-6 py-8">
        {loading ? (
          <StatisticsSkeleton />
        ) : (
          <Tabs defaultValue="todos" className="space-y-6">
            <TabsList className="grid w-full grid-cols-4 lg:w-auto lg:inline-grid">
              <TabsTrigger value="todos" className="gap-2">
                <LayoutGrid className="w-4 h-4" />
                <span className="hidden sm:inline">Todos</span>
                <Badge variant="secondary" className="ml-1">{projects.length}</Badge>
              </TabsTrigger>
              <TabsTrigger value="activos" className="gap-2">
                <TrendingUp className="w-4 h-4" />
                <span className="hidden sm:inline">Activos</span>
                <Badge variant="secondary" className="ml-1 bg-blue-100 text-blue-700">{activeCount}</Badge>
              </TabsTrigger>
              <TabsTrigger value="cerrados" className="gap-2">
                <Lock className="w-4 h-4" />
                <span className="hidden sm:inline">Cerrados</span>
                <Badge variant="secondary" className="ml-1 bg-gray-100 text-gray-700">{closedCount}</Badge>
              </TabsTrigger>
              <TabsTrigger value="completados" className="gap-2">
                <CheckCircle2 className="w-4 h-4" />
                <span className="hidden sm:inline">Completados</span>
                <Badge variant="secondary" className="ml-1 bg-green-100 text-green-700">{completedCount}</Badge>
              </TabsTrigger>
            </TabsList>

            <TabsContent value="todos"><AllProjectsStats projects={projects} /></TabsContent>
            <TabsContent value="activos"><ActiveProjectsStats projects={projects} /></TabsContent>
            <TabsContent value="cerrados"><ClosedProjectsStats projects={projects} /></TabsContent>
            <TabsContent value="completados"><CompletedProjectsStats projects={projects} /></TabsContent>
          </Tabs>
        )}
      </main>
    </div>
  );
}