# Add to your profile the following bash function
# Use it with this command: git commit -m "$(summarize_git_diff)"
# To confirm how the commit message will look like: git log -1
export OPENAI_API_KEY='your openai api key'
summarize_git_diff() {
  # Capture the full git diff (staged changes) without using a pager
  local diff_file chunk_dir chunk_prefix final_summary chunk payload response chunk_summary
  diff_file=$(mktemp)
  git --no-pager diff --cached > "$diff_file"

  # Create a temporary directory for the chunk files
  chunk_dir=$(mktemp -d)
  chunk_prefix="${chunk_dir}/chunk_"

  # Split the diff file into chunks of 200 lines (adjust as needed)
  split -l 200 "$diff_file" "$chunk_prefix"

  # Initialize the final summary
  final_summary=""

  # Process each chunk
  for chunk in "${chunk_dir}"/chunk_*; do
    # Build the JSON payload safely using jq's --rawfile to avoid issues with quotes or newlines
    payload=$(jq -n --rawfile chunk "$chunk" \
      --arg preface "Summarize concisely without losing preciseness the following git diff output to produce a git commit message:\n" \
      '{
        model: "gpt-3.5-turbo",
        messages: [{role: "user", content: ($preface + $chunk)}],
        max_tokens: 150,
        temperature: 0.3
      }')
    
    # Call the OpenAI API
    response=$(curl -sS https://api.openai.com/v1/chat/completions \
      -H "Content-Type: application/json" \
      -H "Authorization: Bearer ${OPENAI_API_KEY}" \
      -d "$payload")
    
    # Extract the summary for this chunk
    chunk_summary=$(echo "$response" | jq -r '.choices[0].message.content')
    
    # Append the chunk summary to the final summary
    final_summary="${final_summary}\n\n${chunk_summary}"
  done

  # Clean up temporary files and directory
  rm "$diff_file"
  rm -r "$chunk_dir"

  # Output the combined summary
  echo -e "$final_summary"
}