Session management

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function createConversationChain() {
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  let lastChatId: string | null = null;
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  return async function sendMessage(assistantId: string, input: string) {
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    const requestBody = {
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      assistantId,
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      input,
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      ...(lastChatId && { previousChatId: lastChatId })
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    };
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    const response = await fetch('https://api.vapi.ai/chat', {
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      method: 'POST',
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      headers: {
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        'Authorization': `Bearer ${process.env.VAPI_API_KEY}`,
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        'Content-Type': 'application/json'
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      },
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      body: JSON.stringify(requestBody)
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    });
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    const chat = await response.json();
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    lastChatId = chat.id;
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    return chat.output[0].content;
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  };
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}
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// Usage
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const sendMessage = createConversationChain();
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await sendMessage("asst_123", "Hi, I'm Alice");
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await sendMessage("asst_123", "What's my name?"); // Remembers Alice

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async function createSession(assistantId: string) {
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  const response = await fetch('https://api.vapi.ai/session', {
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    method: 'POST',
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    headers: {
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      'Authorization': `Bearer ${process.env.VAPI_API_KEY}`,
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      'Content-Type': 'application/json'
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    },
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    body: JSON.stringify({ assistantId })
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  });
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  const session = await response.json();
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  return function sendMessage(input: string) {
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    return fetch('https://api.vapi.ai/chat', {
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      method: 'POST',
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      headers: {
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        'Authorization': `Bearer ${process.env.VAPI_API_KEY}`,
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        'Content-Type': 'application/json'
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      },
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      body: JSON.stringify({ sessionId: session.id, input })
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    })
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    .then(response => response.json())
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    .then(chat => chat.output[0].content);
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  };
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}
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// Usage
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const sendMessage = await createSession("asst_123");
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await sendMessage("I need help with my account");
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await sendMessage("What was my first question?"); // Remembers context

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function createMultiAssistantWorkflow() {
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  const sessions = new Map<string, string>();
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  return async function sendToAssistant(assistantId: string, input: string) {
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    let sessionId = sessions.get(assistantId);
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    if (!sessionId) {
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      const response = await fetch('https://api.vapi.ai/session', {
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        method: 'POST',
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        headers: {
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          'Authorization': `Bearer ${process.env.VAPI_API_KEY}`,
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          'Content-Type': 'application/json'
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        },
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        body: JSON.stringify({ assistantId })
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      });
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      const session = await response.json();
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      sessionId = session.id;
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      sessions.set(assistantId, sessionId);
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    }
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    const response = await fetch('https://api.vapi.ai/chat', {
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      method: 'POST',
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      headers: {
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        'Authorization': `Bearer ${process.env.VAPI_API_KEY}`,
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        'Content-Type': 'application/json'
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      },
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      body: JSON.stringify({ sessionId, input })
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    });
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    const chat = await response.json();
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    return chat.output[0].content;
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  };
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}
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// Usage
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const sendToAssistant = createMultiAssistantWorkflow();
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await sendToAssistant("support_agent", "I have a billing issue");
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await sendToAssistant("billing_agent", "Can you help with this?");