name: Update Community PRs After Merge

on:
  push:
    branches: [main]
    paths:
      - 'community/**'
      - 'schemas/community_submission.*.schema.json'

permissions:
  contents: write
  pull-requests: write

jobs:
  update-open-prs:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          token: ${{ secrets.GITHUB_TOKEN }}

      - name: Setup Python
        uses: actions/setup-python@v5
        with:
          python-version: "3.12"

      - name: Install dependencies
        run: pip install jsonschema

      - name: Get current schema version
        id: schema
        run: |
          # Find the latest schema version on main
          latest=$(ls schemas/community_submission.v*.schema.json 2>/dev/null | sed 's/.*\.v\([0-9]*\)\.schema\.json/\1/' | sort -n | tail -1)
          echo "latest_version=${latest:-1}" >> "$GITHUB_OUTPUT"
          echo "Latest schema version: ${latest:-1}"

      - name: Find and update open community PRs
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          LATEST_SCHEMA_VERSION: ${{ steps.schema.outputs.latest_version }}
        run: |
          # Get list of open community PRs
          prs=$(gh pr list --label community --state open --json number,headRefName --jq '.[] | "\(.number) \(.headRefName)"')
          
          if [ -z "$prs" ]; then
            echo "No open community PRs found"
            exit 0
          fi
          
          echo "$prs" | while read pr_number branch_name; do
            echo "Processing PR #$pr_number (branch: $branch_name)"
            
            # Checkout PR branch
            git fetch origin "$branch_name"
            git checkout "$branch_name"
            
            # Check if this PR has a schema file that needs updating
            pr_schema=$(ls schemas/community_submission.v*.schema.json 2>/dev/null | sed 's/.*\.v\([0-9]*\)\.schema\.json/\1/' | sort -n | tail -1)
            
            if [ "$pr_schema" -le "$LATEST_SCHEMA_VERSION" ] 2>/dev/null; then
              echo "  PR schema version ($pr_schema) <= main version ($LATEST_SCHEMA_VERSION)"
              
              # Merge main into PR branch
              git config user.name "github-actions[bot]"
              git config user.email "github-actions[bot]@users.noreply.github.com"
              
              if git merge origin/main -m "Merge main to update schema baseline"; then
                # Regenerate schema for this PR's submission
                python -m src.contributions.regenerate_pr_schema || true
                
                # If there are changes, commit and push
                if [ -n "$(git status --porcelain schemas/)" ]; then
                  new_version=$((LATEST_SCHEMA_VERSION + 1))
                  git add schemas/
                  git commit -m "Update schema to v${new_version} (rebased on main)"
                  git push origin "$branch_name"
                  echo "  Updated PR #$pr_number with new schema"
                else
                  git push origin "$branch_name"
                  echo "  Merged main into PR #$pr_number"
                fi
              else
                echo "  Merge conflict in PR #$pr_number, adding comment"
                gh pr comment "$pr_number" --body $'⚠️ **Merge Conflict**\n\nAnother community submission was merged and this PR has conflicts.\n\nA maintainer may need to:\n1. Close this PR\n2. Remove the `approved` label from the original issue\n3. Re-add the `approved` label to regenerate the PR'
                git merge --abort
              fi
            fi
            
            git checkout main
          done