import { useEffect, useRef, useState } from 'react';
import { Turnstile } from '@marsidev/react-turnstile';
import { Callout, CalloutDescription } from '@/components/ui/callout';
import { AlertCircle, RefreshCw } from 'lucide-react';
import { Button } from '@/components/ui/button';

interface TurnstileCaptchaProps {
  onSuccess: (token: string) => void;
  onError?: (error: string) => void;
  onExpire?: () => void;
  siteKey?: string;
  theme?: 'light' | 'dark' | 'auto';
  size?: 'normal' | 'compact';
  className?: string;
}

export function TurnstileCaptcha({
  onSuccess,
  onError,
  onExpire,
  siteKey = import.meta.env.VITE_TURNSTILE_SITE_KEY,
  theme = 'auto',
  size = 'normal',
  className = ''
}: TurnstileCaptchaProps) {
  const [error, setError] = useState<string | null>(null);
  const [loading, setLoading] = useState(true);
  const [key, setKey] = useState(0);
  const turnstileRef = useRef(null);

  const handleSuccess = (token: string) => {
    setError(null);
    setLoading(false);
    onSuccess(token);
  };

  const handleError = (errorCode: string) => {
    setLoading(false);
    const errorMessage = getErrorMessage(errorCode);
    setError(errorMessage);
    onError?.(errorMessage);
  };

  const handleExpire = () => {
    setError('CAPTCHA expired. Please try again.');
    onExpire?.();
  };

  const handleLoad = () => {
    setLoading(false);
    setError(null);
  };

  const resetCaptcha = () => {
    setKey(prev => prev + 1);
    setError(null);
    setLoading(true);
  };

  const getErrorMessage = (errorCode: string): string => {
    switch (errorCode) {
      case 'network-error':
        return 'Network error. Please check your connection and try again.';
      case 'timeout':
        return 'CAPTCHA timed out. Please try again.';
      case 'invalid-sitekey':
        return 'Invalid site configuration. Please contact support.';
      case 'token-already-spent':
        return 'CAPTCHA token already used. Please refresh and try again.';
      default:
        return 'CAPTCHA verification failed. Please try again.';
    }
  };

  // Monitor for initialization failures
  useEffect(() => {
    if (loading) {
      const timeout = setTimeout(() => {
        setLoading(false);
      }, 5000); // 5 second timeout
      return () => clearTimeout(timeout);
    }
  }, [loading]);

  if (!siteKey) {
    return (
      <Callout variant="warning">
        <AlertCircle className="h-4 w-4" />
        <CalloutDescription>
          CAPTCHA is not configured. Please set VITE_TURNSTILE_SITE_KEY environment variable.
        </CalloutDescription>
      </Callout>
    );
  }

  return (
    <div className={`space-y-3 ${className}`}>
      <div className="flex flex-col items-center">
        {loading && (
          <div className="w-[300px] h-[65px] flex items-center justify-center border border-dashed border-muted-foreground/30 rounded-lg bg-muted/10 animate-pulse">
            <span className="text-xs text-muted-foreground">Loading CAPTCHA...</span>
          </div>
        )}
        
        <div 
          className="transition-opacity duration-100"
          style={{ 
            display: loading ? 'none' : 'block',
            opacity: loading ? 0 : 1
          }}
        >
          <Turnstile
            key={key}
            ref={turnstileRef}
            siteKey={siteKey}
            onSuccess={handleSuccess}
            onError={handleError}
            onExpire={handleExpire}
            onLoad={handleLoad}
            options={{
              theme,
              size,
              execution: 'render',
              appearance: 'always',
              retry: 'auto'
            }}
          />
        </div>
      </div>

      {error && (
        <Callout variant="destructive">
          <AlertCircle className="h-4 w-4" />
          <CalloutDescription className="flex items-center justify-between">
            <span>{error}</span>
            <Button
              variant="outline"
              size="sm"
              onClick={resetCaptcha}
              className="ml-2 h-6 px-2 text-xs"
            >
              <RefreshCw className="w-3 h-3 mr-1" />
              Retry
            </Button>
          </CalloutDescription>
        </Callout>
      )}
    </div>
  );
}