name: Merge and Push to Other Repository

on:
  pull_request:
    branches:
      - main
    types: 
      - closed

permissions:
  contents: write
  actions: read
  
jobs:
  export_pr:
    if: github.event.pull_request.merged == true && github.event.pull_request.base.ref == 'main' && github.event.pull_request.head.ref == 'sync_branch'
    runs-on: ubuntu-latest
    steps:
      # Step 1: Checkout the current repository
      - name: Checkout current repository
        uses: actions/checkout@v3
        with:
          fetch-depth: 0  # Fetch all history for all branches
      - name: Get Repository Name
        id: get_repo_name
        run: |
          REPO_NAME=${GITHUB_REPOSITORY#*/}

      # Step 2: Clone the target repository
      - name: Remove existing directory
        run: |
          rm -rf ${{ env.TARGET_DIR }}  # Ensure the directory is clean before cloning
      - name: Clone target repository
        run: |
          git clone https://$GITHUB_ACTOR:${{ secrets.TARGET_REPO_PAT }}@github.com/${{ vars.TARGET_REPO }}.git
          cd ${{ vars.TARGET_DIR }}
          git checkout main  # Ensure we are on the main branch

       # Step 3: Set Git user info
      - name: Set Git user info
        run: |
          cd ${{ vars.TARGET_DIR }}
          git config user.name "GitHub Actions"  # Set a name for the user
          git config user.email "actions@github.com"  # Set an email for the user

      # Step 4: Fetch changes from the current repository
      - name: Fetch current repository changes
        run: |
          cd ${{ vars.TARGET_DIR }}
          # Add current repo as a remote
          git remote add current-repo ../  # Give it a descriptive name
          git fetch current-repo  # Fetch from the current repo

          # Get the current branch name
          CURRENT_BRANCH=$(echo $GITHUB_REF | awk -F'/' '{print $3}')  # Get the current branch name

          # Checkout the current branch from the current repository
          git checkout -b sync_branch current-repo/$CURRENT_BRANCH  # Create a new branch based on the current repo's branch

      # Step 5: Merge the target repository's main into the temporary branch
      - name: Merge target repository's main into temp branch
        run: |
          cd ${{ vars.TARGET_DIR }}
          git merge -s ours origin/main --allow-unrelated-histories  # Allow unrelated histories if necessary

      # Step 6: Push the merged changes to the target repository
      - name: Push merged changes to target repository
        run: |
          cd ${{ vars.TARGET_DIR }}
          git push origin sync_branch --force # Push the temporary branch to the target repo

      # Step 7: Create a PR from the temporary branch to the target repo's main
      - name: Create PR from temporary branch to target repo's main
        run: |
          curl -X POST -H "Authorization: token ${{ secrets.TARGET_REPO_PAT }}" \
          -H "Accept: application/vnd.github.v3+json" \
          https://api.github.com/repos/${{ vars.TARGET_REPO }}/pulls \
          -d "{\"title\":\"Sync $REPO_NAME (public) into main\",\"head\":\"sync_branch\",\"base\":\"main\",\"body\":\"Automated PR from GitHub Actions\"}"