"use client";

import { useState, useEffect, useCallback } from "react";
import { Card } from "@/components/ui/card";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import {
  Table, TableBody, TableCell, TableHead, TableHeader, TableRow,
} from "@/components/ui/table";
import { Search, Ban, CheckCircle, RefreshCw } from "lucide-react";
import { toast } from "sonner";
import { adminListCustomers, adminBlockCustomer, CustomerApi } from "@/lib/api/customers";
import { useLanguage } from "@/contexts/LanguageContext";
import { ApiError } from "@/lib/api";

export default function AdminClients() {
  const { t, locale } = useLanguage();
  const [customers, setCustomers] = useState<CustomerApi[]>([]);
  const [loading, setLoading] = useState(true);
  const [search, setSearch] = useState("");
  const [query, setQuery] = useState("");
  const [updating, setUpdating] = useState<string | null>(null);

  const load = useCallback(async () => {
    setLoading(true);
    try {
      const res = await adminListCustomers(query || undefined);
      setCustomers(res.data);
    } catch (err) {
      toast.error(err instanceof ApiError ? err.message : t("admin.error"));
    } finally {
      setLoading(false);
    }
  }, [query]);

  useEffect(() => { load(); }, [load]);

  const handleSearch = (e: React.FormEvent) => {
    e.preventDefault();
    setQuery(search);
  };

  const toggleBlock = async (c: CustomerApi) => {
    setUpdating(c.id);
    try {
      const updated = await adminBlockCustomer(c.id, !c.is_blocked);
      setCustomers((prev) => prev.map((x) => (x.id === c.id ? { ...x, is_blocked: updated.is_blocked } : x)));
      toast.success(updated.is_blocked ? t("admin.customers.blocked") : t("admin.customers.unblocked"));
    } catch (err) {
      toast.error(err instanceof ApiError ? err.message : t("admin.error"));
    } finally {
      setUpdating(null);
    }
  };

  return (
    <div className="space-y-6">
      <div className="flex items-center justify-between">
        <div>
          <h2 className="font-serif text-2xl font-semibold">{t("admin.customers.title")}</h2>
          <p className="text-sm text-muted-foreground mt-1">{customers.length} {t("admin.customers.subtitle")}</p>
        </div>
        <Button variant="outline" size="sm" onClick={load} disabled={loading}>
          <RefreshCw className={`h-4 w-4 mr-2 ${loading ? "animate-spin" : ""}`} />
          {t("admin.refresh")}
        </Button>
      </div>

      <form onSubmit={handleSearch} className="flex gap-2 max-w-sm">
        <Input
          placeholder={t("admin.customers.search_ph")}
          value={search}
          onChange={(e) => setSearch(e.target.value)}
        />
        <Button type="submit" variant="outline" size="icon">
          <Search className="h-4 w-4" />
        </Button>
      </form>

      <Card>
        {loading ? (
          <div className="p-8 space-y-3">
            {Array.from({ length: 5 }).map((_, i) => (
              <div key={i} className="h-12 bg-muted animate-pulse rounded" />
            ))}
          </div>
        ) : (
          <Table>
            <TableHeader>
              <TableRow>
                <TableHead>{t("admin.customers.col_name")}</TableHead>
                <TableHead>{t("admin.customers.col_email")}</TableHead>
                <TableHead>{t("admin.customers.col_phone")}</TableHead>
                <TableHead className="text-center">{t("admin.customers.col_orders")}</TableHead>
                <TableHead className="text-center">{t("admin.customers.col_bookings")}</TableHead>
                <TableHead className="text-right">{t("admin.customers.col_spent")}</TableHead>
                <TableHead>{t("admin.customers.col_joined")}</TableHead>
                <TableHead>{t("admin.status")}</TableHead>
                <TableHead />
              </TableRow>
            </TableHeader>
            <TableBody>
              {customers.length === 0 ? (
                <TableRow>
                  <TableCell colSpan={9} className="text-center text-muted-foreground py-8">
                    {t("admin.customers.none")}
                  </TableCell>
                </TableRow>
              ) : (
                customers.map((c) => (
                  <TableRow key={c.id}>
                    <TableCell className="font-medium">{c.full_name || "—"}</TableCell>
                    <TableCell className="text-sm text-muted-foreground">{c.email}</TableCell>
                    <TableCell className="text-sm text-muted-foreground">{c.phone ?? "—"}</TableCell>
                    <TableCell className="text-center text-sm">{c.orders_count}</TableCell>
                    <TableCell className="text-center text-sm">{c.bookings_count}</TableCell>
                    <TableCell className="text-right font-semibold">{Number(c.total_spent).toFixed(2)} €</TableCell>
                    <TableCell className="text-sm text-muted-foreground">
                      {new Date(c.created_at).toLocaleDateString(locale, { day: "2-digit", month: "short", year: "numeric" })}
                    </TableCell>
                    <TableCell>
                      {c.is_blocked ? (
                        <Badge variant="destructive">{t("admin.status.blocked")}</Badge>
                      ) : (
                        <Badge variant="secondary">{t("admin.status.active")}</Badge>
                      )}
                    </TableCell>
                    <TableCell>
                      <Button
                        variant="ghost"
                        size="icon"
                        disabled={updating === c.id}
                        onClick={() => toggleBlock(c)}
                        title={c.is_blocked ? t("admin.status.active") : t("admin.status.blocked")}
                      >
                        {c.is_blocked ? (
                          <CheckCircle className="h-4 w-4 text-primary" />
                        ) : (
                          <Ban className="h-4 w-4 text-muted-foreground" />
                        )}
                      </Button>
                    </TableCell>
                  </TableRow>
                ))
              )}
            </TableBody>
          </Table>
        )}
      </Card>
    </div>
  );
}