"use client";

// ============================================================================
// Workspace Invites Page
// ============================================================================

import { useEffect, useState } from "react";
import { useParams } from "next/navigation";
import { Loader2, UserPlus, Mail, Check, X, Clock } from "lucide-react";
import { DashboardHeader } from "@/components/layout/dashboard-header";
import { invitesApi } from "@/lib/api";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from "@/components/ui/card";
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
  DialogTrigger,
} from "@/components/ui/dialog";
import { toast } from "sonner";
import type { WorkspaceInvite } from "@/lib/types/api";

// ============================================================================
// Component
// ============================================================================

export default function InvitesPage() {
  const params = useParams();
  const workspaceId = params?.workspaceId as string;

  const [invites, setInvites] = useState<WorkspaceInvite[]>([]);
  const [loading, setLoading] = useState(true);
  const [showDialog, setShowDialog] = useState(false);
  const [username, setUsername] = useState("");

  useEffect(() => {
    loadInvites();
  }, [workspaceId]);

  const loadInvites = async () => {
    try {
      setLoading(true);
      const response = await invitesApi.list(workspaceId, { size: 100 });
      setInvites(response.items);
    } catch (err) {
      console.error("Failed to load invites:", err);
    } finally {
      setLoading(false);
    }
  };

  const handleCreateInvite = async () => {
    if (!username.trim()) return;

    const cleanUsername = username.trim().replace(/^@/, "");
    await toast.promise(
      (async () => {
        const invite = await invitesApi.create(workspaceId, {
          username: cleanUsername,
        });
        setInvites((prev) => [invite, ...prev]);
        setShowDialog(false);
        setUsername("");
        return invite;
      })(),
      {
        loading: "Отправка приглашения...",
        success: `Приглашение отправлено @${cleanUsername}`,
        error: (err) => {
          const errorMessage = err?.error?.message || err?.detail;
          if (errorMessage?.includes("not found")) {
            return `Пользователь @${cleanUsername} не зарегистрирован на платформе`;
          }
          return errorMessage || "Не удалось отправить приглашение";
        },
      }
    );
  };

  const getStatusIcon = (status: WorkspaceInvite["status"]) => {
    switch (status) {
      case "pending":
        return <Clock className="h-4 w-4 text-yellow-500" />;
      case "accepted":
        return <Check className="h-4 w-4 text-green-500" />;
      case "rejected":
        return <X className="h-4 w-4 text-red-500" />;
    }
  };

  const getStatusText = (status: WorkspaceInvite["status"]) => {
    switch (status) {
      case "pending":
        return "Ожидает";
      case "accepted":
        return "Принято";
      case "rejected":
        return "Отклонено";
    }
  };

  const formatDate = (dateString: string) => {
    return new Date(dateString).toLocaleDateString("ru-RU", {
      day: "numeric",
      month: "short",
      year: "numeric",
    });
  };

  return (
    <>
      <DashboardHeader
        breadcrumbs={[
          { label: "Главная", href: `/dashboard/${workspaceId}` },
          { label: "Настройки", href: `/dashboard/${workspaceId}/settings` },
          { label: "Приглашения" },
        ]}
      />

      <div className="flex flex-1 flex-col gap-4 p-4 pt-0 mt-4">
        <div className="flex items-center justify-between">
          <div>
            <h1 className="text-2xl font-bold tracking-tight">Приглашения</h1>
            <p className="text-muted-foreground">
              Приглашения в воркспейс через Telegram
            </p>
          </div>

          <Dialog open={showDialog} onOpenChange={setShowDialog}>
            <DialogTrigger asChild>
              <Button>
                <UserPlus className="h-4 w-4 mr-2" />
                Пригласить
              </Button>
            </DialogTrigger>
            <DialogContent>
              <DialogHeader>
                <DialogTitle>Пригласить участника</DialogTitle>
                <DialogDescription>
                  Введите username Telegram пользователя для отправки
                  приглашения через бота
                </DialogDescription>
              </DialogHeader>
               <div className="space-y-4 py-4">
                 <div className="space-y-2">
                   <Label htmlFor="username">Telegram username</Label>
                   <Input
                     id="username"
                     placeholder="@username"
                     value={username}
                     onChange={(e) => setUsername(e.target.value)}
                     onKeyDown={(e) => {
                       if (e.key === "Enter") {
                         handleCreateInvite();
                       }
                     }}
                   />
                 </div>
               </div>
              <DialogFooter>
                <Button
                  variant="outline"
                  onClick={() => setShowDialog(false)}
                >
                  Отмена
                </Button>
                <Button
                  onClick={handleCreateInvite}
                  disabled={!username.trim()}
                >
                  <Mail className="h-4 w-4 mr-2" />
                  Отправить
                </Button>
              </DialogFooter>
            </DialogContent>
          </Dialog>
        </div>

        {loading ? (
          <div className="flex items-center justify-center py-12">
            <Loader2 className="h-8 w-8 animate-spin text-muted-foreground" />
          </div>
        ) : invites.length === 0 ? (
          <Card>
            <CardContent className="flex flex-col items-center justify-center py-12">
              <Mail className="h-12 w-12 text-muted-foreground mb-4" />
              <h3 className="text-lg font-semibold mb-2">Нет приглашений</h3>
              <p className="text-muted-foreground text-center">
                Пригласите участников в воркспейс через Telegram
              </p>
            </CardContent>
          </Card>
        ) : (
          <Card>
            <Table>
              <TableHeader>
                <TableRow>
                  <TableHead>Username</TableHead>
                  <TableHead>Статус</TableHead>
                  <TableHead>Дата</TableHead>
                </TableRow>
              </TableHeader>
              <TableBody>
                {invites.map((invite) => (
                  <TableRow key={invite.id}>
                    <TableCell>
                      <div className="flex items-center gap-2">
                        <UserPlus className="h-4 w-4 text-muted-foreground" />
                        <span className="font-medium">@{invite.username}</span>
                      </div>
                    </TableCell>
                    <TableCell>
                      <Badge
                        variant={
                          invite.status === "pending"
                            ? "outline"
                            : invite.status === "accepted"
                            ? "default"
                            : "destructive"
                        }
                        className="gap-1"
                      >
                        {getStatusIcon(invite.status)}
                        {getStatusText(invite.status)}
                      </Badge>
                    </TableCell>
                    <TableCell className="text-muted-foreground">
                      {formatDate(invite.created_at)}
                    </TableCell>
                  </TableRow>
                ))}
              </TableBody>
            </Table>
          </Card>
        )}
      </div>
    </>
  );
}