name: Sync Upstream

on:
  schedule:
    # Run weekly on Sundays at 2 AM UTC
    - cron: '0 2 * * 0'
  workflow_dispatch:
    # Allow manual triggering

jobs:
  sync:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Configure Git
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"

      - name: Add upstream remote
        run: |
          git remote add upstream https://github.com/Dictionarry-Hub/database.git || true
          git fetch upstream

      - name: Sync from upstream stable branch
        run: |
          # Try to merge upstream changes
          git merge upstream/stable --no-edit --allow-unrelated-histories || {
            echo "=== Merge conflict detected, applying custom merge strategy ==="

            # PHASE 1: Accept ALL upstream changes first
            echo "Phase 1: Accepting all upstream changes..."
            git checkout --theirs .
            git add -A

            # PHASE 2: Restore our custom files explicitly
            echo "Phase 2: Restoring custom files from our branch..."

            CUSTOM_FILES=(
              "profiles/Micro.yml"
              "custom_formats/Micro Encode Tier 1.yml"
              "custom_formats/Micro Encode Tier 2.yml"
              "custom_formats/Micro Encode Tier 3.yml"
              "regex_patterns/BONE.yml"
              "regex_patterns/ETHEL.yml"
              "regex_patterns/GalaxyRG.yml"
              "regex_patterns/TGx.yml"
            )

            for file in "${CUSTOM_FILES[@]}"; do
              if git cat-file -e HEAD:"$file" 2>/dev/null; then
                echo "  ✓ Preserving: $file"
                git checkout --ours "$file"
                git add "$file"
              else
                echo "  ⚠ Not found in our branch: $file"
              fi
            done

            # Complete the merge
            if git diff --cached --quiet; then
              echo "No changes to commit after merge resolution"
            else
              echo "=== Committing merge ==="
              git commit -m "chore(sync): Merge upstream changes while preserving custom Micro profiles and formats"
            fi
          }

      - name: Push changes
        run: |
          git push origin stable
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

      - name: Create summary
        run: |
          echo "## Upstream Sync Summary" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "✅ Successfully synced from upstream repository" >> $GITHUB_STEP_SUMMARY
          echo "- Source: Dictionarry-Hub/database (stable branch)" >> $GITHUB_STEP_SUMMARY
          echo "- Custom files preserved: Micro profile, Micro encode tiers, and micro-encode release groups" >> $GITHUB_STEP_SUMMARY