name: Version Bump
description: Bump or get semver patch version with git tags

inputs:
  token:
    description: GitHub/Gitea token for pushing tags
    required: true
  mode:
    description: "bump (create tag) or get (read only)"
    required: false
    default: bump

outputs:
  version:
    description: "e.g. 0.1.0 (no v prefix)"
    value: ${{ steps.calc.outputs.version }}
  version_with_sha:
    description: "e.g. 0.1.0-a1b2c3d"
    value: ${{ steps.calc.outputs.version_with_sha }}

runs:
  using: composite
  steps:
    - name: Configure git
      shell: bash
      run: |
        git config user.name "CI Bot"
        git config user.email "ci@git.sebse.de"
        git remote set-url origin https://ci:${{ inputs.token }}@git.sebse.de/${{ github.repository }}

    - name: Fetch tags
      shell: bash
      run: git fetch --tags --force

    - name: Calculate version
      id: calc
      shell: bash
      run: |
        SHORT_SHA=$(echo "${GITHUB_SHA}" | cut -c1-7)
        LATEST_TAG=$(git tag -l 'v*' --sort=-v:refname | head -n1)

        if [ -z "$LATEST_TAG" ]; then
          MAJOR=0
          MINOR=0
          PATCH=0
        else
          V="${LATEST_TAG#v}"
          MAJOR=$(echo "$V" | cut -d. -f1)
          MINOR=$(echo "$V" | cut -d. -f2)
          PATCH=$(echo "$V" | cut -d. -f3)
        fi

        if [ "${{ inputs.mode }}" = "bump" ]; then
          NEW_PATCH=$((PATCH + 1))
        else
          NEW_PATCH=$PATCH
        fi

        VERSION="${MAJOR}.${MINOR}.${NEW_PATCH}"
        echo "version=${VERSION}" >> $GITHUB_OUTPUT
        echo "version_with_sha=${VERSION}-${SHORT_SHA}" >> $GITHUB_OUTPUT
        echo "VERSION=${VERSION}" >> $GITHUB_ENV

    - name: Create and push tag
      if: inputs.mode == 'bump'
      shell: bash
      run: |
        git tag "v${VERSION}"
        git push origin "v${VERSION}"