"use client";

import { useState } from "react";
import { Check, X, Trash2, Mail, Phone } from "lucide-react";
import { Button } from "@/components/ui/button";
import { Card } from "@/components/ui/card";
import { Badge } from "@/components/ui/badge";
import {
  Table, TableBody, TableCell, TableHead, TableHeader, TableRow,
} from "@/components/ui/table";
import { Tabs, TabsList, TabsTrigger } from "@/components/ui/tabs";
import {
  AlertDialog, AlertDialogAction, AlertDialogCancel, AlertDialogContent,
  AlertDialogDescription, AlertDialogFooter, AlertDialogHeader, AlertDialogTitle,
} from "@/components/ui/alert-dialog";
import { useAdmin, Reservation } from "@/contexts/AdminContext";
import { useLanguage } from "@/contexts/LanguageContext";
import { ApiError } from "@/lib/api";
import { toast } from "sonner";

export default function AdminReservations() {
  const { reservations, reservationsLoading, updateReservationStatus, deleteReservation } = useAdmin();
  const { t, locale } = useLanguage();
  const [filter, setFilter] = useState<"all" | Reservation["status"]>("all");
  const [deleteId, setDeleteId] = useState<string | null>(null);

  const statusConfig: Record<Reservation["status"], { label: string; variant: "default" | "secondary" | "destructive" }> = {
    pending:   { label: t("admin.status.pending"),   variant: "secondary" },
    confirmed: { label: t("admin.status.confirmed"), variant: "default" },
    cancelled: { label: t("admin.status.cancelled"), variant: "destructive" },
  };

  const filtered = reservations
    .filter((r) => filter === "all" || r.status === filter)
    .sort((a, b) => `${b.date}${b.time}`.localeCompare(`${a.date}${a.time}`));

  const handleConfirm = async (id: string) => {
    try {
      await updateReservationStatus(id, "confirmed");
      toast.success(t("admin.bookings.confirmed_toast"));
    } catch (err) {
      toast.error(err instanceof ApiError ? err.message : t("admin.error"));
    }
  };

  const handleCancel = async (id: string) => {
    try {
      await updateReservationStatus(id, "cancelled");
      toast.success(t("admin.bookings.cancelled_toast"));
    } catch (err) {
      toast.error(err instanceof ApiError ? err.message : t("admin.error"));
    }
  };

  const handleDelete = async () => {
    if (!deleteId) return;
    try {
      await deleteReservation(deleteId);
      toast.success(t("admin.bookings.deleted_toast"));
    } catch (err) {
      toast.error(err instanceof ApiError ? err.message : t("admin.error"));
    } finally {
      setDeleteId(null);
    }
  };

  return (
    <div className="space-y-6">
      <div>
        <h2 className="font-serif text-2xl font-semibold">{t("admin.bookings.title")}</h2>
        <p className="text-sm text-muted-foreground mt-1">
          {reservations.length} {t("admin.bookings.subtitle")}
        </p>
      </div>

      <Tabs value={filter} onValueChange={(v) => setFilter(v as typeof filter)}>
        <TabsList>
          <TabsTrigger value="all">{t("admin.bookings.tab_all")}</TabsTrigger>
          <TabsTrigger value="pending">{t("admin.bookings.tab_pending")}</TabsTrigger>
          <TabsTrigger value="confirmed">{t("admin.bookings.tab_confirmed")}</TabsTrigger>
          <TabsTrigger value="cancelled">{t("admin.bookings.tab_cancelled")}</TabsTrigger>
        </TabsList>
      </Tabs>

      <Card>
        {reservationsLoading ? (
          <div className="p-8 space-y-3">
            {Array.from({ length: 4 }).map((_, i) => (
              <div key={i} className="h-12 bg-muted animate-pulse rounded" />
            ))}
          </div>
        ) : (
          <Table>
            <TableHeader>
              <TableRow>
                <TableHead>{t("admin.bookings.col_client")}</TableHead>
                <TableHead>{t("admin.bookings.col_contact")}</TableHead>
                <TableHead>{t("admin.bookings.col_service")}</TableHead>
                <TableHead>{t("admin.bookings.col_datetime")}</TableHead>
                <TableHead>{t("admin.status")}</TableHead>
                <TableHead className="text-right">{t("admin.actions")}</TableHead>
              </TableRow>
            </TableHeader>
            <TableBody>
              {filtered.length === 0 ? (
                <TableRow>
                  <TableCell colSpan={6} className="text-center text-muted-foreground py-8">
                    {t("admin.bookings.none")}
                  </TableCell>
                </TableRow>
              ) : (
                filtered.map((r) => (
                  <TableRow key={r.id}>
                    <TableCell className="font-medium">{r.clientName}</TableCell>
                    <TableCell>
                      <div className="text-xs space-y-1">
                        <div className="flex items-center gap-1 text-muted-foreground">
                          <Mail className="h-3 w-3" /> {r.email}
                        </div>
                        <div className="flex items-center gap-1 text-muted-foreground">
                          <Phone className="h-3 w-3" /> {r.phone}
                        </div>
                      </div>
                    </TableCell>
                    <TableCell>{r.service}</TableCell>
                    <TableCell>
                      <div className="text-sm">
                        {new Date(r.date).toLocaleDateString(locale, { day: "2-digit", month: "short", year: "numeric" })}
                      </div>
                      <div className="text-xs text-muted-foreground">{r.time}</div>
                    </TableCell>
                    <TableCell>
                      <Badge variant={statusConfig[r.status].variant}>
                        {statusConfig[r.status].label}
                      </Badge>
                    </TableCell>
                    <TableCell className="text-right space-x-1">
                      {r.status !== "confirmed" && (
                        <Button variant="ghost" size="icon" onClick={() => handleConfirm(r.id)} title={t("admin.status.confirmed")}>
                          <Check className="h-4 w-4 text-primary" />
                        </Button>
                      )}
                      {r.status !== "cancelled" && (
                        <Button variant="ghost" size="icon" onClick={() => handleCancel(r.id)} title={t("admin.status.cancelled")}>
                          <X className="h-4 w-4 text-muted-foreground" />
                        </Button>
                      )}
                      <Button variant="ghost" size="icon" onClick={() => setDeleteId(r.id)} title={t("admin.delete")}>
                        <Trash2 className="h-4 w-4 text-destructive" />
                      </Button>
                    </TableCell>
                  </TableRow>
                ))
              )}
            </TableBody>
          </Table>
        )}
      </Card>

      <AlertDialog open={!!deleteId} onOpenChange={(o) => !o && setDeleteId(null)}>
        <AlertDialogContent>
          <AlertDialogHeader>
            <AlertDialogTitle>{t("admin.bookings.delete_title")}</AlertDialogTitle>
            <AlertDialogDescription>{t("admin.irreversible")}</AlertDialogDescription>
          </AlertDialogHeader>
          <AlertDialogFooter>
            <AlertDialogCancel>{t("admin.cancel")}</AlertDialogCancel>
            <AlertDialogAction onClick={handleDelete}>{t("admin.delete")}</AlertDialogAction>
          </AlertDialogFooter>
        </AlertDialogContent>
      </AlertDialog>
    </div>
  );
}