name: GH → GL Backup (staged, parallel)

on:
  schedule:
    - cron: '0 0 * * 1'
  workflow_dispatch:

concurrency:
  group: gh2gl-mirror
  cancel-in-progress: false

env:
  FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true

jobs:
  discover:
    runs-on: ubuntu-latest
    timeout-minutes: 10
    outputs:
      repos: ${{ steps.out.outputs.repos }}
      batches: ${{ steps.out.outputs.batches }}
      batch_count: ${{ steps.out.outputs.batch_count }}
      repo_count: ${{ steps.out.outputs.repo_count }}
    steps:
      - uses: actions/checkout@v6
        with:
          fetch-depth: 1
          sparse-checkout: scripts
      - name: Discover repos (all includes forks + archived)
        id: out
        env:
          GH_USER: ${{ github.repository_owner }}
          GH_TOKEN: ${{ secrets.GH_PAT }}
          MAX_BATCHES: '25'
        run: node scripts/gitlab/discover.js

  backup:
    needs: discover
    if: ${{ needs.discover.result == 'success' && needs.discover.outputs.repo_count != '0' }}
    runs-on: ubuntu-latest
    timeout-minutes: 60
    strategy:
      fail-fast: false
      max-parallel: 25
      matrix:
        batch: ${{ fromJson(needs.discover.outputs.batches) }}
    steps:
      - uses: actions/checkout@v6
        with:
          fetch-depth: 1
          sparse-checkout: scripts
      - name: Ensure GitLab projects & mirror batch
        env:
          REPOS_JSON: ${{ needs.discover.outputs.repos }}
          BATCH_INDEX: ${{ matrix.batch }}
          BATCH_COUNT: ${{ needs.discover.outputs.batch_count }}
          CONCURRENCY: '3'
          GH_USER: ${{ github.repository_owner }}
          GH_TOKEN: ${{ secrets.GH_PAT }}
          GITLAB_TOKEN: ${{ secrets.GITLAB_TOKEN }}
          GITLAB_HOST: ${{ secrets.GITLAB_HOST }}
          GITLAB_NAMESPACE: ${{ secrets.GITLAB_NAMESPACE }}
          RESULTS_DIR: ${{ github.workspace }}/mirror-results
        run: node scripts/gitlab/mirror.js
      - name: Upload batch results
        if: always()
        uses: actions/upload-artifact@v7
        with:
          name: mirror-results-${{ matrix.batch }}
          path: mirror-results/
          retention-days: 1
          if-no-files-found: ignore

  notify:
    needs: [discover, backup]
    if: always()
    runs-on: ubuntu-latest
    timeout-minutes: 10
    steps:
      - uses: actions/checkout@v6
        with:
          fetch-depth: 1
          sparse-checkout: scripts
      - name: Download mirror results
        uses: actions/download-artifact@v8
        with:
          pattern: mirror-results-*
          path: mirror-results/
          merge-multiple: true
        continue-on-error: true
      - name: Send Discord notification
        env:
          DISCORD_WEBHOOK_URL: ${{ secrets.DISCORD_WEBHOOK_URL }}
          WORKFLOW_STATUS: ${{ (needs.discover.result == 'success' && needs.backup.result == 'success') && 'success' || 'failure' }}
          BACKUP_RESULT: ${{ needs.backup.result }}
          REPO_COUNT: ${{ needs.discover.outputs.repo_count }}
          RESULTS_DIR: ${{ github.workspace }}/mirror-results
        run: node scripts/gitlab/notify.js