name: Update_CalVer_Amend

on:
  push:
    branches:
      - 'main'
    paths:
      - 'subgen.py'
  workflow_dispatch:  # Allow manual triggering

jobs:
  docker:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v3
        with:
          fetch-depth: 0  # Crucial for getting full history

      - name: Calculate version
        id: version
        run: |
          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 subgen.py with version
        run: |
          sed -i "s/subgen_version =.*/subgen_version = '${{ env.VERSION }}'/" subgen.py

      - name: Check if subgen.py was actually changed (compare with HEAD)
        id: check_change
        run: |
          if git diff --quiet HEAD subgen.py; then
            echo "::set-output name=changed::false"
          else
            echo "::set-output name=changed::true"
          fi

      - name: Amend commit if subgen.py changed
        if: steps.check_change.outputs.changed == 'true'
        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}"

          git add subgen.py
          git commit --amend --reuse-message=HEAD --author="${GIT_AUTHOR_NAME} <${GIT_AUTHOR_EMAIL}>"  # Amend the last commit

          # Push with force-with-lease (safer than --force)
          git push --force-with-lease origin HEAD:main