name: "Codegen Check"

on:
  push:
    branches:
      - main
  pull_request:
    paths:
      - 'scripts/codegen/**'
      - 'src/generated/java/**'
      - '.github/workflows/codegen-check.yml'
  workflow_dispatch:

# Permissions: contents: write and pull-requests: write are needed to push
# regenerated files back to PR branches. actions: write is needed to trigger
# the agentic fix workflow via gh workflow run.
#
# Dependabot PR caveat: Workflows triggered by pull_request from Dependabot
# run with a read-only GITHUB_TOKEN regardless of declared permissions.
# The push step uses continue-on-error to handle this gracefully — if the
# push fails (Dependabot), the agentic fix workflow will handle pushing
# via its own push-to-pull-request-branch safe-output.
permissions:
  contents: write
  pull-requests: write
  actions: write

jobs:
  check:
    name: "Verify generated files are up-to-date"
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:
          ref: ${{ github.event.pull_request.head.sha || github.sha }}
          # For PRs, check out the PR head so we can push back to it
          repository: ${{ github.event.pull_request.head.repo.full_name || github.repository }}

      - uses: actions/setup-node@48b55a011bda9f5d6aeb4c2d9c7362e8dae4041e # v6
        with:
          node-version: 22

      - name: Install codegen dependencies
        working-directory: ./scripts/codegen
        run: npm ci

      - name: Run codegen
        working-directory: ./scripts/codegen
        run: npm run generate

      - name: Check for uncommitted changes
        id: check-changes
        run: |
          if [ -n "$(git status --porcelain)" ]; then
            echo "changed=true" >> "$GITHUB_OUTPUT"
            echo "Generated files are out of date."
            git diff --stat
          else
            echo "changed=false" >> "$GITHUB_OUTPUT"
            echo "✅ Generated files are up-to-date"
          fi

      # --- On push to main: fail if generated files are stale (existing behavior) ---
      - name: Fail on stale generated files (push to main)
        if: steps.check-changes.outputs.changed == 'true' && github.event_name != 'pull_request'
        run: |
          echo "::error::Generated files are out of date. Run 'cd scripts/codegen && npm run generate' and commit the changes."
          git diff
          exit 1

      # --- On PR: commit regenerated files back and verify build ---
      - name: Commit and push regenerated files to PR branch
        id: push-regen
        if: steps.check-changes.outputs.changed == 'true' && github.event_name == 'pull_request'
        continue-on-error: true
        env:
          GH_TOKEN: ${{ github.token }}
          HEAD_REF: ${{ github.head_ref }}
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git add -A
          git commit -m "Regenerate codegen output

          Auto-committed by codegen-check workflow."
          git push origin "HEAD:$HEAD_REF"

      - name: Fail if regenerated files could not be pushed
        if: steps.push-regen.outcome == 'failure'
        run: |
          echo "::error::Could not push regenerated files to the PR branch. This is expected for Dependabot PRs (read-only token) and fork PRs."
          echo "To fix: check out this PR branch locally, run 'cd scripts/codegen && npm run generate', commit, and push."
          exit 1

      - uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5
        if: steps.push-regen.outcome == 'success'
        with:
          java-version: "17"
          distribution: "microsoft"
          cache: "maven"

      - name: Run mvn verify
        id: mvn-verify
        if: steps.push-regen.outcome == 'success'
        continue-on-error: true
        env:
          COPILOT_GITHUB_TOKEN: ${{ secrets.COPILOT_GITHUB_TOKEN }}
        run: |
          set -o pipefail
          mvn verify 2>&1 | tee /tmp/mvn-verify-output.txt
          echo "exit_code=$?" >> "$GITHUB_OUTPUT"

      - name: Capture error summary
        id: error-summary
        if: steps.mvn-verify.outcome == 'failure'
        run: |
          SUMMARY=$(tail -80 /tmp/mvn-verify-output.txt)
          echo "$SUMMARY" > /tmp/error-summary.txt
          echo "has_errors=true" >> "$GITHUB_OUTPUT"

      - name: Trigger agentic fix workflow
        id: trigger-fix
        if: steps.error-summary.outputs.has_errors == 'true' && steps.push-regen.outcome == 'success'
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PR_NUMBER: ${{ github.event.pull_request.number }}
          BRANCH: ${{ github.head_ref }}
        run: |
          ERROR_SUMMARY=$(cat /tmp/error-summary.txt)

          gh workflow run codegen-agentic-fix.lock.yml \
            -f branch="$BRANCH" \
            -f pr_number="$PR_NUMBER" \
            -f error_summary="$ERROR_SUMMARY"
          echo "Triggered codegen-agentic-fix workflow on branch $BRANCH for PR #$PR_NUMBER"

      - name: Wait for agentic fix to complete
        if: steps.trigger-fix.outcome == 'success'
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          BRANCH: ${{ github.head_ref }}
        run: |
          echo "Waiting for agentic fix workflow to start..."
          sleep 30

          for i in $(seq 1 60); do
            RUN_ID=$(gh run list \
              --workflow=codegen-agentic-fix.lock.yml \
              --branch="$BRANCH" \
              --limit=1 \
              --json databaseId,status \
              --jq '.[0].databaseId')

            STATUS=$(gh run list \
              --workflow=codegen-agentic-fix.lock.yml \
              --branch="$BRANCH" \
              --limit=1 \
              --json databaseId,status \
              --jq '.[0].status')

            if [ "$STATUS" = "completed" ]; then
              echo "Agentic fix workflow run $RUN_ID completed."
              CONCLUSION=$(gh run view "$RUN_ID" --json conclusion --jq .conclusion)
              echo "Conclusion: $CONCLUSION"
              break
            fi

            echo "Run $RUN_ID status: $STATUS (attempt $i/60)"
            sleep 30
          done

          if [ "$STATUS" != "completed" ]; then
            echo "::warning::Agentic fix workflow did not complete within 30 minutes."
          fi

      - name: Fetch latest changes after agentic fix
        if: steps.trigger-fix.outcome == 'success'
        env:
          HEAD_REF: ${{ github.head_ref }}
        run: |
          git fetch origin "$HEAD_REF"
          git reset --hard "origin/$HEAD_REF"

      - name: Final mvn verify after agentic fix
        if: steps.trigger-fix.outcome == 'success'
        env:
          COPILOT_GITHUB_TOKEN: ${{ secrets.COPILOT_GITHUB_TOKEN }}
        run: mvn verify