name: Unpack files.zip (create branch + PR)

on:
  workflow_dispatch:
    inputs:
      branch:
        description: 'Branch containing files.zip'
        required: true
        default: 'C2-integration'

permissions:
  contents: write
  pull-requests: write

jobs:
  unpack-and-pr:
    runs-on: ubuntu-latest

    steps:
      # ---------------------------------------------------------
      # 0. Checkout the target branch ONLY — prevents recursion
      # ---------------------------------------------------------
      - name: Checkout target branch
        uses: actions/checkout@v4
        with:
          ref: ${{ github.event.inputs.branch }}
          fetch-depth: 0
          persist-credentials: true

      - name: Install tools
        run: |
          sudo apt-get update -y
          sudo apt-get install -y unzip rsync jq

      # ---------------------------------------------------------
      # 1. Verify files.zip exists in branch root
      # ---------------------------------------------------------
      - name: Check for files.zip
        run: |
          if [ ! -f "files.zip" ]; then
            echo "::error ::files.zip not found in root of branch ${{ github.event.inputs.branch }}"
            exit 1
          fi
          echo "Found files.zip:"
          ls -lh files.zip

      # ---------------------------------------------------------
      # 2. Unzip files into extracted/
      # ---------------------------------------------------------
      - name: Extract zip
        run: |
          rm -rf extracted
          mkdir extracted
          unzip -o files.zip -d extracted
          echo "Extracted files sample:"
          find extracted -type f | sed -n '1,50p'

      # ---------------------------------------------------------
      # 3. Copy extracted files into root of repo
      # ---------------------------------------------------------
      - name: Copy extracted contents
        run: |
          rsync -a extracted/ . --exclude='.git'

      # ---------------------------------------------------------
      # 4. Detect changes and create commit branch
      # ---------------------------------------------------------
      - name: Commit changes if any
        id: gitops
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"

          if git status --porcelain | grep -q . ; then
            BRANCH="unpacked-${{ github.event.inputs.branch }}-$(date +%s)"
            git checkout -b "$BRANCH"
            git add -A
            git commit -m "Unpacked files.zip automatically"
            echo "branch=$BRANCH" >> $GITHUB_OUTPUT
          else
            echo "nochanges=true" >> $GITHUB_OUTPUT
          fi

      # ---------------------------------------------------------
      # 5. Push branch only if changes exist
      # ---------------------------------------------------------
      - name: Push branch
        if: steps.gitops.outputs.nochanges != 'true'
        run: |
          git push --set-upstream origin "${{ steps.gitops.outputs.branch }}"

      # ---------------------------------------------------------
      # 6. Open PR only if changes exist
      # ---------------------------------------------------------
      - name: Open Pull Request
        if: steps.gitops.outputs.nochanges != 'true'
        uses: peter-evans/create-pull-request@v6
        with:
          token: ${{ secrets.GITHUB_TOKEN }}
          title: "Automated unpack of files.zip into ${{ github.event.inputs.branch }}"
          body: |
            This PR was automatically generated.

            **Action:** Unpacked `files.zip` from branch `${{ github.event.inputs.branch }}`.
            **Branch:** `${{ steps.gitops.outputs.branch }}`
          base: ${{ github.event.inputs.branch }}
          head: ${{ steps.gitops.outputs.branch }}
          draft: false

      # ---------------------------------------------------------
      # 7. Final log
      # ---------------------------------------------------------
      - name: Done
        run: |
          if [ "${{ steps.gitops.outputs.nochanges }}" = "true" ]; then
            echo "No changes detected. Nothing to commit."
          else
            echo "PR created successfully."
          fi