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1# Originally written by, https://github.com/yzwijsen
2# https://raw.githubusercontent.com/yzwijsen/chatgpt-powershell/main/ChatGPT-One-Shot.ps1
3
4<#
5This script will take a rough email draft and help you turn it into a professionally written email.
6It's a minimal example showing how to set a system message in order to elicit a one-shot response from ChatGPT.
7#>
8
9# Define API key and endpoint
10$ApiKey = "<your API key>"
11$ApiEndpoint = "https://api.openai.com/v1/chat/completions"
12
13<#
14System message.
15You can use this to give the AI instructions on what to do, how to act or how to respond to future prompts.
16Default value for ChatGPT = "You are a helpful assistant."
17#>
18$AiSystemMessage = "You are an email writing assistant. I will provide you with a rough draft of an email or some general message that I want to convey and you will respond with a clean, professionally writen email. Please provide 3 seperate answers ranging from informal, formal to business formal. All answers must be in the same language as the provided input."
19
20# Function to send a message to ChatGPT
21function Invoke-ChatGPT ($message) {
22    # List of Hashtables that will hold the system message and user message.
23    [System.Collections.Generic.List[Hashtable]]$messages = @()
24
25    # Sets the initial system message
26    $messages.Add(@{"role" = "system"; "content" = $AiSystemMessage}) | Out-Null
27
28    # Add the user input
29    $messages.Add(@{"role"="user"; "content"=$message})
30
31    # Set the request headers
32    $headers = @{
33    "Content-Type" = "application/json"
34    "Authorization" = "Bearer $ApiKey"
35    }   
36
37    # Set the request body
38    $requestBody = @{
39        "model" = "gpt-3.5-turbo"
40        "messages" = $messages
41        "max_tokens" = 2000 # Max amount of tokens the AI will respond with
42        "temperature" = 0.5 # lower is more coherent and conservative, higher is more creative and diverse.
43    }
44
45    # Send the request
46    $response = Invoke-RestMethod -Method POST -Uri $ApiEndpoint -Headers $headers -Body (ConvertTo-Json $requestBody)
47
48    # Return the message content
49    return $response.choices[0].message.content
50}
51
52# Get user input
53$userInput = Read-Host "Rough email draft or message"
54
55# Query ChatGPT
56$AiResponse = Invoke-ChatGPT $UserInput
57
58# Show response
59write-output $AiResponse
60
61Read-Host "Press enter to Exit..."