#!/bin/sh
# prepare-commit-msg hook for ULFlow Golang Starter Kit
# This hook prepares the commit message template

COMMIT_MSG_FILE=$1
COMMIT_SOURCE=$2
SHA1=$3

# Only add template if this is not a merge, amend, or rebase
if [ -z "$COMMIT_SOURCE" ]; then
  # Check the current branch name to suggest commit type
  BRANCH_NAME=$(git symbolic-ref --short HEAD)
  
  # Extract type from branch name (e.g., feat/123-user-auth -> feat)
  BRANCH_TYPE=$(echo $BRANCH_NAME | cut -d '/' -f 1)
  
  # If branch follows naming convention, prepopulate commit message
  if [[ "$BRANCH_TYPE" =~ ^(feat|fix|docs|style|refactor|test|chore)$ ]]; then
    # Get the first line of the current commit message
    first_line=$(head -n 1 $COMMIT_MSG_FILE)
    
    # If the first line doesn't already have the type, prepend it
    if [[ ! "$first_line" =~ ^$BRANCH_TYPE ]]; then
      # Read existing commit msg
      commit_msg=$(cat $COMMIT_MSG_FILE)
      
      # Create new commit msg with suggested type
      echo "$BRANCH_TYPE: " > $COMMIT_MSG_FILE
      echo "$commit_msg" >> $COMMIT_MSG_FILE
    fi
  fi
fi

exit 0