name: Setup and update common workflows

on:
  schedule:
    - cron: "0 2 * * *"
  workflow_dispatch:
    inputs:
      config:
        description: 'Config'
        required: false
        default: ''

jobs:
  update:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout default branch
        # https://github.com/marketplace/actions/checkout
        uses: actions/checkout@v2
        with:
          token: ${{ secrets.GH_WORKFLOWS_TOKEN }}

      - name: Read config
        run: |
          CONFIG='{}'
          if [[ ! -z '${{ github.event.inputs.config }}' ]]; then
            CONFIG='${{ github.event.inputs.config }}'
          elif [[ -f "./.github/workflows-config.json" ]]; then
            CONFIG=$( jq -c .setupWorkflows './.github/workflows-config.json' )
          fi
          echo "CONFIG=$CONFIG" >> $GITHUB_ENV
          echo "Workflow config: $CONFIG"

      - name: Process config
        run: |
          AS_PR=$(echo '${{ env.CONFIG }}' | jq -r ".pushAsPullRequest")
          if [[ "$AS_PR" == "true" ]]; then
            echo "AS_PR=1" >> $GITHUB_ENV
          else
            echo "AS_PR=0" >> $GITHUB_ENV
          fi
          BRANCH_SOURCE=$(git rev-parse --abbrev-ref HEAD)
          if [[ "$AS_PR" == "true" ]]; then
            BRANCH_SOURCE="t/setup-workflows-update_$BRANCH_SOURCE"
          fi
          echo "BRANCH_SOURCE=$BRANCH_SOURCE" >> $GITHUB_ENV

      - name: Check if update branch already exists
        if: env.AS_PR == 1
        run: |
          if [[ $(git ls-remote --heads | grep ${{ env.BRANCH_SOURCE }} | wc -c) -ne 0 ]]; then
            echo "SHOULD_CANCEL=1" >> $GITHUB_ENV
          fi

      - name: Cancel build if update branch already exists
        if: env.SHOULD_CANCEL == 1
        # https://github.com/marketplace/actions/cancel-this-build
        uses: andymckay/cancel-action@0.2

      - name: Wait for cancellation
        if: env.SHOULD_CANCEL == 1
        # https://github.com/marketplace/actions/wait-sleep
        uses: jakejarvis/wait-action@master
        with:
          time: '60s'

      - name: Checkout common workflows repository
        # https://github.com/marketplace/actions/checkout
        uses: actions/checkout@v2
        with:
          path: ckeditor4-workflows-common
          repository: ckeditor/ckeditor4-workflows-common
          ref: master

      - name: Setup workflows directory
        run: |
          mkdir -p .github/workflows

      - name: Synchronize workflow files
        run: |
          rsync -a --include='*/' --include='*.yml' --exclude='*' ./ckeditor4-workflows-common/workflows/ ./.github/workflows/
          if [[ $(git status ./.github/workflows/ --porcelain) ]]; then
              echo "HAS_CHANGES=1" >> $GITHUB_ENV
          fi

      - name: Cleanup common workflows artifacts
        run: |
          rm -rf ckeditor4-workflows-common

      - name: Checkout PR branch
        if: env.HAS_CHANGES == 1
        run: |
          git checkout -b "t/${{ env.BRANCH_SOURCE }}"

      - name: Add changes
        if: env.HAS_CHANGES == 1
        run: |
          git config --local user.email "${{ secrets.GH_BOT_EMAIL }}"
          git config --local user.name "${{ secrets.GH_BOT_USERNAME }}"
          git add .github/workflows
          git commit -m "Update common workflows."

      - name: Push changes
        if: env.HAS_CHANGES == 1
        # https://github.com/marketplace/actions/github-push
        uses: ad-m/github-push-action@master
        with:
          github_token: ${{ secrets.GH_WORKFLOWS_TOKEN }}
          branch: ${{ env.BRANCH_SOURCE }}

      - name: Create PR
        if: env.HAS_CHANGES == 1 && env.AS_PR == 1
        # https://github.com/marketplace/actions/github-pull-request-action
        uses: repo-sync/pull-request@v2
        with:
          source_branch: "${{ env.BRANCH_SOURCE }}"
          destination_branch: "${{ github.ref }}"
          pr_title: "Update 'setup-workflows' workflow"
          pr_body: "Update 'setup-workflows' workflow."
          github_token: ${{ secrets.GITHUB_TOKEN }}