"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 { ChevronLeft, ChevronRight } from "lucide-react";
import { formatDate } from "@/lib/utils";
import { LibreChatUser, LibreChatBalance } from "@/lib/types";


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

  // Charger les utilisateurs
  const {
    data: users = [],
    total = 0,
    loading: usersLoading,
  } = useCollection<LibreChatUser>("users", {
    page,
    limit,
  });

  // 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>
        <CardTitle>Liste des utilisateurs ({total})</CardTitle>
      </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.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>
                      <Badge variant={isActive ? 'default' : 'secondary'}>
                        {isActive ? 'Actif' : 'Inactif'}
                      </Badge>
                    </TableCell>
                    <TableCell>
                      <span className="text-sm text-muted-foreground">
                        {formatDate(user.createdAt)}
                      </span>
                    </TableCell>
                  </TableRow>
                );
              })}
            </TableBody>
          </Table>
        </div>

        {/* Pagination */}
        <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>
      </CardContent>
    </Card>
  );
}