name: Sync subtrees

on:
  workflow_dispatch:
    inputs:
      dryRun:
        description: 'If true, don’t push any changes (for testing only).'
        required: true
        default: true
        type: boolean
      testMerge:
        description: 'Run in test mode, pushing to a test branch.'
        required: true
        default: false
        type: boolean

env:
  CI_SERVER_HOST: github.com
  GROUP: ${{ github.repository_owner }}
  AUTH_TOKEN: "x-access-token:${{ secrets.X_ACCESS_TOKEN }}"
  DEFAULT_REF: ${{ github.event.repository.default_branch }}
  TEST_REF: _gha-${{ github.event.repository.name }}-sync-subtrees-${{ github.run_number }}

jobs:
  sync-subtrees:
    runs-on: ubuntu-latest
    container:
      image: buildpack-deps:bionic-scm

    steps:
      - name: Install GitHub CLI
        run: |
          apt-get update && apt-get install -y curl unzip
          curl -fsSL https://github.com/cli/cli/releases/download/v2.74.0/gh_2.74.0_linux_amd64.tar.gz | tar -xz
          cp gh_*/bin/gh /usr/local/bin
          gh --version

      - name: Print Configuration
        run: |
          echo "testMerge:   ${{ github.event.inputs.testMerge }}"
          echo "dryRun:      ${{ github.event.inputs.dryRun }}"
          echo "DEFAULT_REF: ${DEFAULT_REF}"
          echo "TEST_REF:    ${TEST_REF}"

      - name: Verify AUTH_TOKEN
        run: |
          expected="b7ff89ebb635bba5eac9652f5eae8a5123346c1da6ef42852d4494f58b0bf0cb"
          actual=$(echo "$AUTH_TOKEN" | sha256sum | awk '{print $1}' | tr -d '\r')
          if [ "$actual" != "$expected" ]; then
            echo "ERROR: Invalid AUTH_TOKEN" >&2
            exit 1
          fi

      - name: System Information
        run: |
          uname -a
          git --version
          gh --version
          printenv | sort

      - name: Clone repository
        run: |
          git clone https://${AUTH_TOKEN}@${CI_SERVER_HOST}/${GROUP}/${{ github.event.repository.name }}.git

      - name: Configure Git & Set REF
        run: |
          git config --global user.name "github-actions[bot]"
          git config --global user.email "41898282+github-actions[bot]@users.noreply.github.com"

          if [ "${{ github.event.inputs.testMerge }}" = "true" ]; then
            echo "REF=${TEST_REF}" >> $GITHUB_ENV
          else
            echo "REF=${DEFAULT_REF}" >> $GITHUB_ENV
          fi

      - name: Ensure REF is set
        run: |
          if [ -z "${REF}" ]; then
            echo "ERROR: REF not set" >&2
            exit 1
          fi
          echo "Using REF: ${REF}"

      - name: Checkout branch
        run: |
          cd ${{ github.event.repository.name }}
          git fetch origin
          git checkout ${REF} || git checkout -b ${REF}
          
      - name: Sync subtrees
        shell: bash
        run: |
          # See .gitlab-ci.yml for the original script.
          set -ex
          cd ${{ github.event.repository.name }}

          declare -A urls=( \
            ["iphreeqc-src"]="https://${AUTH_TOKEN}@${CI_SERVER_HOST}/${GROUP}-subtrees/iphreeqc-src.git" \
            ["phreeqc-commanuscript-cgfinal-examples-c"]="https://${AUTH_TOKEN}@${CI_SERVER_HOST}/${GROUP}-subtrees/phreeqc-commanuscript-cgfinal-examples-c.git" \
            ["phreeqc-commanuscript-cgfinal-examples-com"]="https://${AUTH_TOKEN}@${CI_SERVER_HOST}/${GROUP}-subtrees/phreeqc-commanuscript-cgfinal-examples-com.git" \
            ["phreeqc-COMManuscript-CGfinal-examples-fortran"]="https://${AUTH_TOKEN}@${CI_SERVER_HOST}/${GROUP}-subtrees/phreeqc-COMManuscript-CGfinal-examples-fortran.git" \
            ["phreeqc3-database"]="https://${AUTH_TOKEN}@${CI_SERVER_HOST}/${GROUP}-subtrees/phreeqc3-database.git" \
            ["phreeqc3-doc"]="https://${AUTH_TOKEN}@${CI_SERVER_HOST}/${GROUP}-subtrees/phreeqc3-doc.git" \
            ["phreeqc3-examples"]="https://${AUTH_TOKEN}@${CI_SERVER_HOST}/${GROUP}-subtrees/phreeqc3-examples.git" \
          )

          declare -A prefixes=( \
            ["iphreeqc-src"]="src" \
            ["phreeqc-commanuscript-cgfinal-examples-c"]="examples/c" \
            ["phreeqc-commanuscript-cgfinal-examples-com"]="examples/com" \
            ["phreeqc-COMManuscript-CGfinal-examples-fortran"]="examples/fortran" \
            ["phreeqc3-database"]="database" \
            ["phreeqc3-doc"]="phreeqc3-doc" \
            ["phreeqc3-examples"]="phreeqc3-examples" \
          )

          export GIT_EDITOR=true

          echo "---- Pulling subtrees ----"
          for remote in "${!urls[@]}"; do
            git subtree pull --prefix "${prefixes[$remote]}" --squash "${urls[$remote]}" ${DEFAULT_REF}
          done

          echo "---- Completed subtree pulls ----"

          if [ "${{ github.event.inputs.dryRun }}" = "true" ]; then
            echo "Dry run enabled: skipping pushes"
            exit 0
          fi          

          echo "---- Pushing changes to subtrees ----"
          for remote in "${!urls[@]}"; do
            git subtree push --prefix "${prefixes[$remote]}" "${urls[$remote]}" "${REF}" > /dev/null 2>&1 || echo "Failed to push to ${remote}" >&2
          done          

          echo "Pushing to origin..."
          git push origin "${REF}"