name: 'Commit and push if the version file has changed'

inputs:
  name:
    description: 'The name of the commiter'
    required: true
    default: 'github-actions[bot]'
  email:
    description: 'The email of the commiter'
    required: true
    default: 'github-actions[bot]@users.noreply.github.com'
  message:
    description: 'The commit message'
    required: true
    default: 'New release version(s)'
  files:
    description: 'The file(s) to add in the commit'
    required: true
    default: '*'
  directory:
    description: 'The directory in which the action will be performed'
    required: true
    default: '.'
  src_branch:
    description: 'Checkout (or create) a specific branch before commit/push. Defaults to current branch'
    required: false
    default: ''
  dst_branch:
    description: 'Push the created commit on a specific branch. Defaults to current branch'
    required: false
    default: ''
  secret:
    description: 'A token allowing to push the commit on the repository'
    required: true
    default: '.'
  repository:
    description: 'The repository where to push'
    required: true
    default: ''

runs:
  using: 'composite'
  steps:
    - name: Commit the changes
      id: commit
      run: |
        git config --global user.name ${{ inputs.name }}
        ORIGIN="$(pwd)"
        cd ${{ inputs.directory }}

        CURRENT_BRANCH=${GITHUB_REF#refs/heads/};
        # calculating source branch
        if [ -n  "${{ inputs.src_branch }}" ]; \
        then \
          git switch ${{ inputs.src_branch }} 2>/dev/null || git switch -c ${{ inputs.src_branch }}; \
          SRC_BRANCH=${{ inputs.src_branch }}; \
        else \
          SRC_BRANCH=`git branch --show-current`; \
          if [ -z "$SRC_BRANCH" ]; \
          then \
            SRC_BRANCH=$CURRENT_BRANCH; \
          fi \
        fi

        # calculating destination branch
        if [ -n "${{ inputs.dst_branch }}" ]; \
        then \
          DST_BRANCH=${{ inputs.dst_branch }}; \
        else \
          DST_BRANCH=`git branch --show-current`; \
          if [ -z "$DST_BRANCH" ]; \
          then \
            DST_BRANCH=$CURRENT_BRANCH; \
          fi \
        fi

        echo "-----------------------------------------------------------"
        echo "Initial repo status"
        git status
        # checking changes, commit if needed
        CHANGES="$(git status --porcelain ${{ inputs.files }})"
        if [ -n "${CHANGES}" ]; \
        then \
          echo -e "Changes:\n${CHANGES}"; \
          git add ${{ inputs.files }}; \
          echo "-----------------------------------------------------------"; \
          echo "Repo status before commit"; \
          git status; \
          git commit -am "${{ inputs.message }}"; \
        fi

        # compute if a push is needed
        if [ -n "${CHANGES}" -o "$SRC_BRANCH" != "$DST_BRANCH" ]; \
        then \
          PUSH="YES"; \
        else \
          PUSH="NO"; \
        fi

        git log -n 2
        cd "${ORIGIN}"

        echo " -- Env SRC_BRANCH: $SRC_BRANCH";
        echo " -- Env DST_BRANCH: $DST_BRANCH";
        echo " -- Env PUSH: $PUSH"
        # exporting these variables for next steps
        echo "##[set-output name=src_branch;]$(echo $SRC_BRANCH)";
        echo "##[set-output name=dst_branch;]$(echo $DST_BRANCH)";
        echo "##[set-output name=push;]$(echo $PUSH)";
      shell: bash

    - name: Push commit
      if: steps.commit.outputs.push == 'YES'
      uses: ad-m/github-push-action@master
      with:
        github_token: ${{ inputs.secret }}
        branch: ${{ steps.commit.outputs.dst_branch }}
        directory: ${{ inputs.directory }}
        repository: ${{ inputs.repository }}