import OpenAI from 'openai'
const openai = new OpenAI({
  apiKey:
    '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'
}) // or set environment: export OPENAI_API_KEY=...

const my = {
  model: 'gpt-5-nano'
}

const tools = [
  {
    type: 'function',
    name: 'get_horoscope',
    description: "Get today's horoscope for an astrological sign.",
    parameters: {
      type: 'object',
      properties: {
        sign: {
          type: 'string',
          description: 'An astrological sign like Taurus or Aquarius'
        }
      },
      required: ['sign']
    }
  }
]

const api = {
  get_horoscope ({ sign } = {}) {
    return sign + ' Next Tuesday you will befriend a baby otter.'
  }
}

// Create a running input list we will add to over time
let input = [
  { role: 'user', content: 'What is my horoscope? I am an Aquarius.' }
]

// 2. Prompt the model with tools defined
let response = await openai.responses.create({
  model: my.model,
  tools,
  input
})

console.log('==========Response 1. round')
console.log(JSON.stringify(response, null, 2)) // response.output_text/output_parsed

input.push(...response.output) // add the model's response to the input, including any function calls, otherwise the next request reports: 'BadRequestError: 400 No tool call found for function call output with call_id ...'

response.output.forEach(item => {
  if (item.type == 'function_call') {
    if (typeof api[item.name] === 'function') {
      console.log('function call =', item)

      const function_call_output = api[item.name](JSON.parse(item.arguments))
      console.log('function call output =', function_call_output)

      // 4. Provide function call results to the model
      input.push({
        type: 'function_call_output',
        call_id: item.call_id,
        output: function_call_output.toString()
      })
    }
  }
})

console.log('=========Input appended with function call output')
console.log(JSON.stringify(input, null, 2))

response = await openai.responses.create({
  model: my.model,
  //instructions: 'Respond only with a horoscope generated by a tool.',
  tools,
  input
})

// 5. The model should be able to give a response!
console.log('============Final output:')
console.log(JSON.stringify(response.output, null, 2))