Using OpenAI chat completion (GPT3) with function calls to SMHI api

The API is instructed to use the current time in Europe/Stockholm timezone. If the message can not be handled with the weather API endpoint, the Open AI assistant will reply instead.

• SMHI, forecast documentation
• OPEN AI, GPT function calling documentation

RUN_ENDPOINT?args=["A weather question"]

{ 
answer?: string // If the message could not be answered with the SMHI  API
error?:string // 
data?: unknown // the actual data returned from SMHI, if the API is called
summary?: string // a summary of the data, by GPT API
 }

• How is the weather in the Capital of Sweden tomorrow.
• How is the weather at Liseberg on Friday.

• zod: for describing the SMHI API response and function API input
• zod-to-json-schema: Transform the zod schema to json schema (readable by the GPT API)
• gpt3-tokenizer: count the number of tokens
• date-fns-tz: To handle dates in a specific timezone (Europe/Stockholm)