"use client";

import { useState, useMemo } from "react";
import { useCollection } from "@/hooks/useCollection";
import { Card, CardContent, CardHeader, CardTitle } from "@/components/ui/card";
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table";
import { Button } from "@/components/ui/button";
import { Badge } from "@/components/ui/badge";
import { Input } from "@/components/ui/input";
import { ChevronLeft, ChevronRight, Search } from "lucide-react";
import { formatDate } from "@/lib/utils";
import { LibreChatUser, LibreChatBalance } from "@/lib/types";

export function UsersTable() {
  const [page, setPage] = useState(1);
  const [searchTerm, setSearchTerm] = useState("");
  const limit = 20;

  const {
    data: users = [],
    total = 0,
    loading: usersLoading,
  } = useCollection<LibreChatUser>("users", {
    page,
    limit,
    // ✅ AJOUTER le searchTerm ici
    search: searchTerm,
  });

  // Charger tous les balances pour associer les crédits
  const { data: balances = [] } = useCollection<LibreChatBalance>("balances", {
    limit: 1000, // Charger tous les balances
  });

  // Créer une map des crédits par utilisateur
  const creditsMap = useMemo(() => {
    const map = new Map<string, number>();
    balances.forEach((balance) => {
      map.set(balance.user, balance.tokenCredits || 0);
    });
    return map;
  }, [balances]);

  const totalPages = Math.ceil(total / limit);

  const handlePrevPage = () => {
    setPage((prev) => Math.max(1, prev - 1));
  };

  const handleNextPage = () => {
    setPage((prev) => Math.min(totalPages, prev + 1));
  };

  if (usersLoading) {
    return (
      <Card>
        <CardHeader>
          <CardTitle>Liste des utilisateurs</CardTitle>
        </CardHeader>
        <CardContent>
          <div className="space-y-4">
            {Array.from({ length: 5 }).map((_, i) => (
              <div key={i} className="h-16 bg-muted animate-pulse rounded" />
            ))}
          </div>
        </CardContent>
      </Card>
    );
  }

  return (
    <Card>
      <CardHeader>
        <div className="flex flex-col space-y-4 sm:flex-row sm:items-center sm:justify-between sm:space-y-0">
          <CardTitle>
            Liste des utilisateurs ({searchTerm ? users.length : total})
          </CardTitle>
          <div className="relative w-full sm:w-80">
            <Search className="absolute left-3 top-1/2 h-4 w-4 -translate-y-1/2 text-muted-foreground" />
            <Input
              placeholder="Rechercher par nom ou email..."
              value={searchTerm}
              onChange={(e) => setSearchTerm(e.target.value)}
              className="pl-10"
            />
          </div>
        </div>
      </CardHeader>
      <CardContent>
        <div className="rounded-md border">
          <Table>
            <TableHeader>
              <TableRow>
                <TableHead>ID</TableHead>
                <TableHead>Nom</TableHead>
                <TableHead>Email</TableHead>
                <TableHead>Rôle</TableHead>
                <TableHead>Crédits</TableHead>
                <TableHead>Statut</TableHead>
                <TableHead>Créé le</TableHead>
              </TableRow>
            </TableHeader>
            <TableBody>
              {users.length > 0 ? (
                users.map((user) => {
                  const userCredits = creditsMap.get(user._id) || 0;
                  const isActive =
                    new Date(user.updatedAt || user.createdAt) >
                    new Date(Date.now() - 30 * 24 * 60 * 60 * 1000); // 30 jours en millisecondes

                  return (
                    <TableRow key={user._id}>
                      <TableCell>
                        <span className="font-mono text-xs">
                          {user._id.slice(-8)}
                        </span>
                      </TableCell>
                      <TableCell>
                        <span className="font-medium">{user.name}</span>
                      </TableCell>
                      <TableCell>
                        <span className="text-sm">{user.email}</span>
                      </TableCell>
                      <TableCell>
                        <Badge
                          variant={
                            user.role === "ADMIN" ? "default" : "secondary"
                          }
                        >
                          {user.role}
                        </Badge>
                      </TableCell>
                      <TableCell>
                        <span className="font-semibold">
                          {userCredits.toLocaleString()} crédits
                        </span>
                      </TableCell>
                      <TableCell>
                        <span className="text-sm text-muted-foreground">
                          <Badge variant={isActive ? "default" : "secondary"}>
                            {isActive ? "Actif" : "Inactif"}
                          </Badge>
                        </span>
                      </TableCell>
                      <TableCell>
                        <span className="text-sm text-muted-foreground">
                          {formatDate(user.createdAt)}
                        </span>
                      </TableCell>
                    </TableRow>
                  );
                })
              ) : (
                <TableRow>
                  <TableCell
                    colSpan={7}
                    className="text-center py-8 text-muted-foreground"
                  >
                    {searchTerm
                      ? `Aucun utilisateur trouvé pour "${searchTerm}"`
                      : "Aucun utilisateur trouvé"}
                  </TableCell>
                </TableRow>
              )}
            </TableBody>
          </Table>
        </div>

        {/* Pagination - masquée lors de la recherche */}
        {!searchTerm && (
          <div className="flex items-center justify-between space-x-2 py-4">
            <div className="text-sm text-muted-foreground">
              Page {page} sur {totalPages} ({total} éléments au total)
            </div>
            <div className="flex space-x-2">
              <Button
                variant="outline"
                size="sm"
                onClick={handlePrevPage}
                disabled={page <= 1}
              >
                <ChevronLeft className="h-4 w-4" />
                Précédent
              </Button>
              <Button
                variant="outline"
                size="sm"
                onClick={handleNextPage}
                disabled={page >= totalPages}
              >
                Suivant
                <ChevronRight className="h-4 w-4" />
              </Button>
            </div>
          </div>
        )}

        {/* Info de recherche */}
        {searchTerm && (
          <div className="py-4 text-sm text-muted-foreground">
            {users.length} résultat(s) trouvé(s) pour &quot;{searchTerm}
            &quot;
          </div>
        )}
      </CardContent>
    </Card>
  );
}