Ask AI API reference

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import { useState, useCallback, useRef } from 'react';

function AskAIChat({ appId, apiKey, indexName, assistantId }) {
  const [messages, setMessages] = useState([]);
  const [isLoading, setIsLoading] = useState(false);
  const [isStreaming, setIsStreaming] = useState(false);
  const abortControllerRef = useRef(null);
  const baseUrl = 'https://askai.algolia.com';

  const getToken = useCallback(async () => {
    const response = await fetch(`${baseUrl}/chat/token`, {
      method: 'POST',
      headers: {
        'X-Algolia-Assistant-Id': assistantId,
      },
    });
    const data = await response.json();
    return data.token;
  }, [assistantId]);

  const sendMessage = useCallback(async (content) => {
    const newMessage = {
      role: 'user',
      content,
      id: `msg-${Date.now()}`,
    };

    setMessages(prev => [...prev, newMessage]);
    setIsLoading(true);
    setIsStreaming(true);

    // Create abort controller for cancellation
    abortControllerRef.current = new AbortController();

    try {
      const token = await getToken();
      const response = await fetch(`${baseUrl}/chat`, {
        method: 'POST',
        signal: abortControllerRef.current.signal,
        headers: {
          'Content-Type': 'application/json',
          'X-Algolia-Application-Id': appId,
          'X-Algolia-API-Key': apiKey,
          'X-Algolia-Index-Name': indexName,
          'X-Algolia-Assistant-Id': assistantId,
          'Authorization': token,
        },
        body: JSON.stringify({
          id: 'conversation-1',
          messages: [...messages, newMessage],
          searchParameters: {
            facetFilters: ['language:en', 'type:content']
          },
        }),
      });

      if (!response.ok) {
        throw new Error(`HTTP error! status: ${response.status}`);
      }

      // Handle streaming response in real-time
      const reader = response.body.getReader();
      const decoder = new TextDecoder();
      let assistantMessage = '';
      let assistantMessageId = `assistant-${Date.now()}`;

      // Add initial empty assistant message
      setMessages(prev => [...prev, {
        role: 'assistant',
        content: '',
        id: assistantMessageId
      }]);

      while (true) {
        const { done, value } = await reader.read();
        if (done) break;

        // Decode chunk and add to message
        const chunk = decoder.decode(value, { stream: true });
        if (chunk.trim()) {
          assistantMessage += chunk;

          // Update UI with streaming content immediately
          setMessages(prev => prev.map(msg =>
            msg.id === assistantMessageId
              ? { ...msg, content: assistantMessage }
              : msg
          ));
        }
      }
    } catch (error) {
      if (error.name !== 'AbortError') {
        console.error('Streaming error:', error);
        // Add error message to chat
        setMessages(prev => [...prev, {
          role: 'assistant',
          content: 'Sorry, there was an error processing your request.',
          id: `error-${Date.now()}`
        }]);
      }
    } finally {
      setIsLoading(false);
      setIsStreaming(false);
      abortControllerRef.current = null;
    }
  }, [messages, appId, apiKey, indexName, assistantId, getToken]);

  const cancelStream = useCallback(() => {
    if (abortControllerRef.current) {
      abortControllerRef.current.abort();
    }
  }, []);

  return (
    <div className="chat-container">
      <div className="messages">
        {messages.map((message) => (
          <div key={message.id} className={`message ${message.role}`}>
            <strong>{message.role}:</strong>
            <span className={isStreaming && message.role === 'assistant' && message === messages[messages.length - 1] ? 'streaming' : ''}>
              {message.content}
              {isStreaming && message.role === 'assistant' && message === messages[messages.length - 1] && (
                <span className="cursor">▊</span>
              )}
            </span>
          </div>
        ))}
      </div>

      <form onSubmit={(e) => {
        e.preventDefault();
        if (isLoading) return;

        const input = e.target.elements.message;
        if (input.value.trim()) {
          sendMessage(input.value);
          input.value = '';
        }
      }}>
        <input
          name="message"
          type="text"
          placeholder="Ask a question..."
          disabled={isLoading}
        />
        <button type="submit" disabled={isLoading}>
          {isLoading ? 'Sending...' : 'Send'}
        </button>
        {isStreaming && (
          <button type="button" onClick={cancelStream}>
            Cancel
          </button>
        )}
      </form>

      <style jsx>{`
        .streaming {
          animation: pulse 1.5s ease-in-out infinite;
        }
        .cursor {
          animation: blink 1s infinite;
        }
        @keyframes pulse {
          0%, 100% { opacity: 1; }
          50% { opacity: 0.7; }
        }
        @keyframes blink {
          0%, 50% { opacity: 1; }
          51%, 100% { opacity: 0; }
        }
      `}</style>
    </div>
  );
}

export default AskAIChat;