"use client";

import { useState } from "react";
import { useRouter } from "next/navigation";
import { Loader2, Trash2, Monitor, Smartphone, Globe } from "lucide-react";
import { toast } from "sonner";
import {
  Table,
  TableBody,
  TableCell,
  TableHead,
  TableHeader,
  TableRow,
} from "@/components/ui/table";
import { Button } from "@/components/ui/button";
import { Badge } from "@/components/ui/badge";
import {
  AlertDialog,
  AlertDialogAction,
  AlertDialogCancel,
  AlertDialogContent,
  AlertDialogDescription,
  AlertDialogFooter,
  AlertDialogHeader,
  AlertDialogTitle,
} from "@/components/ui/alert-dialog";

interface Session {
  id: string;
  ip_address: string;
  user_agent: string;
  created_at: string;
  expires_at: string;
}

interface UserSessionsProps {
  sessions: Session[];
  userId: string;
}

function parseUserAgent(ua: string): { device: string; browser: string } {
  const isMobile = /mobile|android|iphone|ipad/i.test(ua);
  const device = isMobile ? "Mobile" : "Desktop";
  
  let browser = "Unknown";
  if (ua.includes("Chrome")) browser = "Chrome";
  else if (ua.includes("Firefox")) browser = "Firefox";
  else if (ua.includes("Safari")) browser = "Safari";
  else if (ua.includes("Edge")) browser = "Edge";
  
  return { device, browser };
}

export function UserSessions({ sessions, userId }: UserSessionsProps) {
  const router = useRouter();
  const [isLoading, setIsLoading] = useState(false);
  const [showRevokeAllDialog, setShowRevokeAllDialog] = useState(false);
  const [revokingSessionId, setRevokingSessionId] = useState<string | null>(null);

  async function handleRevokeSession(sessionId: string) {
    setRevokingSessionId(sessionId);
    try {
      const response = await fetch(`/api/admin/users/${userId}/sessions/${sessionId}`, {
        method: "DELETE",
      });

      if (!response.ok) {
        const data = await response.json();
        throw new Error(data.error || "Failed to revoke session");
      }

      toast.success("Session revoked");
      router.refresh();
    } catch (error) {
      toast.error(error instanceof Error ? error.message : "An error occurred");
    } finally {
      setRevokingSessionId(null);
    }
  }

  async function handleRevokeAllSessions() {
    setIsLoading(true);
    try {
      const response = await fetch(`/api/admin/users/${userId}/sessions`, {
        method: "DELETE",
      });

      if (!response.ok) {
        const data = await response.json();
        throw new Error(data.error || "Failed to revoke sessions");
      }

      toast.success("All sessions revoked");
      router.refresh();
    } catch (error) {
      toast.error(error instanceof Error ? error.message : "An error occurred");
    } finally {
      setIsLoading(false);
      setShowRevokeAllDialog(false);
    }
  }

  if (sessions.length === 0) {
    return (
      <div className="text-center py-8 text-muted-foreground">
        No active sessions
      </div>
    );
  }

  return (
    <div className="space-y-4">
      <div className="flex justify-end">
        <Button
          variant="destructive"
          size="sm"
          onClick={() => setShowRevokeAllDialog(true)}
          disabled={isLoading}
        >
          Revoke All Sessions
        </Button>
      </div>

      <Table>
        <TableHeader>
          <TableRow>
            <TableHead>Device</TableHead>
            <TableHead>IP Address</TableHead>
            <TableHead>Created</TableHead>
            <TableHead>Expires</TableHead>
            <TableHead className="w-[100px]"></TableHead>
          </TableRow>
        </TableHeader>
        <TableBody>
          {sessions.map((session) => {
            const { device, browser } = parseUserAgent(session.user_agent || "");
            const isExpired = new Date(session.expires_at) < new Date();
            
            return (
              <TableRow key={session.id}>
                <TableCell>
                  <div className="flex items-center gap-2">
                    {device === "Mobile" ? (
                      <Smartphone className="h-4 w-4 text-muted-foreground" />
                    ) : (
                      <Monitor className="h-4 w-4 text-muted-foreground" />
                    )}
                    <span>{browser}</span>
                    {isExpired && (
                      <Badge variant="outline" className="text-xs">Expired</Badge>
                    )}
                  </div>
                </TableCell>
                <TableCell>
                  <div className="flex items-center gap-2">
                    <Globe className="h-4 w-4 text-muted-foreground" />
                    {session.ip_address || "Unknown"}
                  </div>
                </TableCell>
                <TableCell className="text-muted-foreground">
                  {new Date(session.created_at).toLocaleString()}
                </TableCell>
                <TableCell className="text-muted-foreground">
                  {new Date(session.expires_at).toLocaleString()}
                </TableCell>
                <TableCell>
                  <Button
                    variant="ghost"
                    size="sm"
                    onClick={() => handleRevokeSession(session.id)}
                    disabled={revokingSessionId === session.id}
                  >
                    {revokingSessionId === session.id ? (
                      <Loader2 className="h-4 w-4 animate-spin" />
                    ) : (
                      <Trash2 className="h-4 w-4" />
                    )}
                  </Button>
                </TableCell>
              </TableRow>
            );
          })}
        </TableBody>
      </Table>

      <AlertDialog open={showRevokeAllDialog} onOpenChange={setShowRevokeAllDialog}>
        <AlertDialogContent>
          <AlertDialogHeader>
            <AlertDialogTitle>Revoke All Sessions</AlertDialogTitle>
            <AlertDialogDescription>
              Are you sure you want to revoke all sessions for this user? They will
              be signed out from all devices.
            </AlertDialogDescription>
          </AlertDialogHeader>
          <AlertDialogFooter>
            <AlertDialogCancel disabled={isLoading}>Cancel</AlertDialogCancel>
            <AlertDialogAction
              onClick={handleRevokeAllSessions}
              disabled={isLoading}
              className="bg-destructive text-destructive-foreground hover:bg-destructive/90"
            >
              {isLoading ? (
                <>
                  <Loader2 className="mr-2 h-4 w-4 animate-spin" />
                  Revoking...
                </>
              ) : (
                "Revoke All"
              )}
            </AlertDialogAction>
          </AlertDialogFooter>
        </AlertDialogContent>
      </AlertDialog>
    </div>
  );
}
