"use client";

import { Package, CalendarCheck, Clock, TrendingUp } from "lucide-react";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import { Badge } from "@/components/ui/badge";
import { useAdmin } from "@/contexts/AdminContext";

export default function AdminOverview() {
  const { products, reservations } = useAdmin();

  const pending = reservations.filter((r) => r.status === "pending").length;
  const confirmed = reservations.filter((r) => r.status === "confirmed").length;
  const totalValue = products.reduce((sum, p) => sum + p.price, 0);

  const stats = [
    { label: "Produits", value: products.length, icon: Package, color: "text-blue-600", bg: "bg-blue-100" },
    { label: "RDV en attente", value: pending, icon: Clock, color: "text-amber-600", bg: "bg-amber-100" },
    { label: "RDV confirmés", value: confirmed, icon: CalendarCheck, color: "text-green-600", bg: "bg-green-100" },
    { label: "Valeur catalogue", value: `${totalValue} €`, icon: TrendingUp, color: "text-primary", bg: "bg-primary/10" },
  ];

  const upcoming = [...reservations]
    .filter((r) => r.status !== "cancelled")
    .sort((a, b) => `${a.date}${a.time}`.localeCompare(`${b.date}${b.time}`))
    .slice(0, 5);

  return (
    <div className="space-y-6">
      <div>
        <h2 className="font-serif text-2xl font-semibold">Vue d'ensemble</h2>
        <p className="text-sm text-muted-foreground mt-1">Aperçu de votre activité</p>
      </div>

      <div className="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-4">
        {stats.map((s) => (
          <Card key={s.label}>
            <CardContent className="p-5 flex items-center justify-between">
              <div>
                <p className="text-sm text-muted-foreground">{s.label}</p>
                <p className="text-2xl font-semibold mt-1">{s.value}</p>
              </div>
              <div className={`h-10 w-10 rounded-full ${s.bg} flex items-center justify-center`}>
                <s.icon className={`h-5 w-5 ${s.color}`} />
              </div>
            </CardContent>
          </Card>
        ))}
      </div>

      <Card>
        <CardHeader>
          <CardTitle className="text-base">Prochains rendez-vous</CardTitle>
        </CardHeader>
        <CardContent>
          {upcoming.length === 0 ? (
            <p className="text-sm text-muted-foreground">Aucun rendez-vous à venir.</p>
          ) : (
            <div className="space-y-3">
              {upcoming.map((r) => (
                <div key={r.id} className="flex items-center justify-between py-3 border-b border-border last:border-0">
                  <div>
                    <p className="font-medium text-sm">{r.clientName}</p>
                    <p className="text-xs text-muted-foreground">{r.service}</p>
                  </div>
                  <div className="text-right">
                    <p className="text-sm font-medium">{new Date(r.date).toLocaleDateString("fr-FR", { day: "2-digit", month: "short" })} à {r.time}</p>
                    <Badge variant={r.status === "confirmed" ? "default" : "secondary"} className="mt-1 text-xs">
                      {r.status === "confirmed" ? "Confirmé" : "En attente"}
                    </Badge>
                  </div>
                </div>
              ))}
            </div>
          )}
        </CardContent>
      </Card>
    </div>
  );
};