import { useState, useEffect } from 'react';
import { apiClient } from '@/services/api/client';
import { Button } from '@/components/ui/button';
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from '@/components/ui/card';
import { LoadingSpinner } from '@/components/ui/loading-spinner';
import {
  Shield,
  Smartphone,
  Monitor,
  Globe,
  Trash2,
  LogOut,
} from 'lucide-react';

interface Session {
  id: string;
  ip_address: string;
  user_agent: string;
  last_activity: string;
  created_at: string;
  is_current: boolean;
}

interface SessionsResponse {
  sessions: Session[];
  count: number;
}

export function SessionsPage() {
  const [sessions, setSessions] = useState<Session[]>([]);
  const [loading, setLoading] = useState(true);
  const [revoking, setRevoking] = useState<string | null>(null);
  const [revokingAll, setRevokingAll] = useState(false);
  const [error, setError] = useState<string | null>(null);

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

  const fetchSessions = async () => {
    try {
      setLoading(true);
      setError(null);
      const response = await apiClient.get<SessionsResponse>('/auth/sessions');
      setSessions(response.data.sessions);
    } catch (error: any) {
      console.error('Failed to fetch sessions', error);
      setError(
        error.response?.data?.error ||
          'Failed to load sessions. Please try again.',
      );
    } finally {
      setLoading(false);
    }
  };

  const revokeSession = async (sessionId: string) => {
    try {
      setRevoking(sessionId);
      setError(null);
      await apiClient.delete(`/auth/sessions/${sessionId}`);
      await fetchSessions();
    } catch (error: any) {
      console.error('Failed to revoke session', error);
      setError(
        error.response?.data?.error ||
          'Failed to revoke session. Please try again.',
      );
    } finally {
      setRevoking(null);
    }
  };

  const revokeAllOther = async () => {
    if (
      !window.confirm(
        'Are you sure you want to revoke all other sessions? You will remain logged in on this device.',
      )
    ) {
      return;
    }

    try {
      setRevokingAll(true);
      setError(null);
      await apiClient.delete('/auth/sessions');
      await fetchSessions();
    } catch (error: any) {
      console.error('Failed to revoke sessions', error);
      setError(
        error.response?.data?.error ||
          'Failed to revoke sessions. Please try again.',
      );
    } finally {
      setRevokingAll(false);
    }
  };

  const getDeviceIcon = (userAgent: string) => {
    const ua = userAgent.toLowerCase();
    if (
      ua.includes('mobile') ||
      ua.includes('android') ||
      ua.includes('iphone')
    ) {
      return <Smartphone className="h-5 w-5" />;
    }
    if (ua.includes('tablet') || ua.includes('ipad')) {
      return <Monitor className="h-5 w-5" />;
    }
    return <Monitor className="h-5 w-5" />;
  };

  const formatDate = (dateString: string) => {
    const date = new Date(dateString);
    return new Intl.DateTimeFormat('en-US', {
      year: 'numeric',
      month: 'short',
      day: 'numeric',
      hour: '2-digit',
      minute: '2-digit',
    }).format(date);
  };

  if (loading) {
    return (
      <div className="flex items-center justify-center min-h-[400px]">
        <LoadingSpinner />
      </div>
    );
  }

  return (
    <div className="space-y-6">
      {/* En-tête */}
      <div>
        <h1 className="text-3xl font-bold tracking-tight">Active Sessions</h1>
        <p className="text-muted-foreground">
          Manage your active sessions and sign out from other devices
        </p>
      </div>

      {/* Message d'erreur */}
      {error && (
        <div className="bg-destructive/10 text-destructive px-4 py-3 rounded-md">
          {error}
        </div>
      )}

      {/* Bouton pour révoquer toutes les autres sessions */}
      <div className="flex justify-end">
        <Button
          onClick={revokeAllOther}
          disabled={revokingAll || sessions.length <= 1}
          variant="destructive"
        >
          {revokingAll ? (
            <>
              <LoadingSpinner className="mr-2 h-4 w-4" />
              Revoking...
            </>
          ) : (
            <>
              <LogOut className="mr-2 h-4 w-4" />
              Revoke All Other Sessions
            </>
          )}
        </Button>
      </div>

      {/* Liste des sessions */}
      <Card>
        <CardHeader>
          <CardTitle className="flex items-center gap-2">
            <Shield className="h-5 w-5" />
            Sessions ({sessions.length})
          </CardTitle>
          <CardDescription>
            These are the devices where you're currently signed in
          </CardDescription>
        </CardHeader>
        <CardContent>
          {sessions.length === 0 ? (
            <div className="text-center py-8 text-muted-foreground">
              No active sessions found.
            </div>
          ) : (
            <div className="space-y-4">
              {sessions.map((session) => (
                <div
                  key={session.id}
                  className={`flex items-center justify-between p-4 border rounded-lg ${
                    session.is_current
                      ? 'border-primary bg-primary/5'
                      : 'border-border'
                  }`}
                >
                  <div className="flex items-start gap-4 flex-1">
                    <div className="mt-1">
                      {getDeviceIcon(session.user_agent)}
                    </div>
                    <div className="flex-1 space-y-1">
                      <div className="flex items-center gap-2">
                        <p className="font-medium">
                          {session.user_agent || 'Unknown Device'}
                        </p>
                        {session.is_current && (
                          <span className="px-2 py-0.5 text-xs font-medium bg-primary text-primary-foreground rounded">
                            Current Session
                          </span>
                        )}
                      </div>
                      <div className="flex flex-wrap gap-4 text-sm text-muted-foreground">
                        <div className="flex items-center gap-1">
                          <Globe className="h-4 w-4" />
                          <span>{session.ip_address || 'Unknown IP'}</span>
                        </div>
                        <div>
                          <span className="font-medium">Created:</span>{' '}
                          {formatDate(session.created_at)}
                        </div>
                        {session.last_activity && (
                          <div>
                            <span className="font-medium">Last activity:</span>{' '}
                            {formatDate(session.last_activity)}
                          </div>
                        )}
                      </div>
                    </div>
                  </div>
                  {!session.is_current && (
                    <Button
                      onClick={() => revokeSession(session.id)}
                      disabled={revoking === session.id}
                      variant="destructive"
                      size="sm"
                    >
                      {revoking === session.id ? (
                        <>
                          <LoadingSpinner className="mr-2 h-4 w-4" />
                          Revoking...
                        </>
                      ) : (
                        <>
                          <Trash2 className="mr-2 h-4 w-4" />
                          Revoke
                        </>
                      )}
                    </Button>
                  )}
                </div>
              ))}
            </div>
          )}
        </CardContent>
      </Card>
    </div>
  );
}

export default SessionsPage;
