name: Update_CalVer

on:
  push:
    branches:
      - 'main'
    paths:
      - 'subgen.py'
      - 'launcher.py'
  workflow_dispatch:

jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v3
        with:
          # Fetch only the latest commit initially
          fetch-depth: 1
          ref: main

      - name: Fetch commits for this month
        run: |
          # Fetch commits starting from the first day of the current month
          YEAR=$(date +%Y)
          MONTH=$(date +%m)
          git fetch --shallow-since="$YEAR-$MONTH-01"

      - name: Calculate version
        id: version
        run: |
          # Calculate the commit count for this month
          YEAR=$(date +%Y)
          MONTH=$(date +%m)
          COMMIT_COUNT=$(git rev-list --count HEAD --since="$YEAR-$MONTH-01")
          echo "COMMIT_COUNT=$COMMIT_COUNT"
          echo "VERSION=${YEAR}.${MONTH}.${COMMIT_COUNT}" >> $GITHUB_ENV

      - name: Update version file
        run: |
          # Update subgen.py with the calculated version
          sed -i "s/subgen_version =.*/subgen_version = '${{ env.VERSION }}'/" subgen.py

      - name: Amend commit with version update
        env:
          GIT_AUTHOR_NAME: "McCloudS"
          GIT_AUTHOR_EMAIL: "scott@mccloud.dev"
        run: |
          git config user.name "${GIT_AUTHOR_NAME}"
          git config user.email "${GIT_AUTHOR_EMAIL}"

          # Stage the modified file
          git add subgen.py

          # Amend the most recent commit, reusing the previous commit message
          git commit --amend --reuse-message=HEAD --author="${GIT_AUTHOR_NAME} <${GIT_AUTHOR_EMAIL}>"

          # Push the amended commit
          git push --force