name: AI Engine CI

# Validates the Python AI engine: regenerates tool models and runs the
# engine quality gate (lint, type-check, format-check, tests). Called from
# build.yml on PRs and merge_group; also runs directly on push to main as
# a post-merge safety net.
on:
  workflow_call:
  push:
    branches: [main]

permissions:
  contents: read

jobs:
  engine:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      pull-requests: write
    env:
      DEPOT_TOKEN: ${{ secrets.DEPOT_TOKEN }}
    steps:
      - name: Harden the runner (Audit all outbound calls)
        uses: step-security/harden-runner@ab7a9404c0f3da075243ca237b5fac12c98deaa5 # v2.19.3
        with:
          egress-policy: audit

      - name: Checkout code
        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2

      - name: Install uv
        uses: astral-sh/setup-uv@08807647e7069bb48b6ef5acd8ec9567f424441b # v8.1.0
        with:
          enable-cache: true

      - name: Set up JDK 25
        uses: actions/setup-java@be666c2fcd27ec809703dec50e508c2fdc7f6654 # v5.2.0
        with:
          java-version: "25"
          distribution: "temurin"

      - name: Setup Gradle
        uses: gradle/actions/setup-gradle@50e97c2cd7a37755bbfafc9c5b7cafaece252f6e # v6.1.0
        with:
          gradle-version: 9.3.1

      - name: Install Task
        uses: go-task/setup-task@3be4020d41929789a01026e0e427a4321ce0ad44 # v2.0.0

      - name: Regenerate tool models
        run: task engine:tool-models

      - name: Verify tool models are up to date
        id: tool-models-check
        continue-on-error: true
        run: git diff --exit-code engine/src/stirling/models/tool_models.py

      - name: Comment on tool models check failure
        # Only post a comment on PRs. github-script's PR helpers need an
        # issue/PR number, which doesn't exist on merge_group runs.
        if: steps.tool-models-check.outcome == 'failure' && github.event_name == 'pull_request'
        continue-on-error: true
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        with:
          script: |
            const marker = '<!-- tool-models-check -->';
            const body = [
              marker,
              '### Tool Models Check Failed',
              '',
              'The generated `engine/src/stirling/models/tool_models.py` is out of date with the Java OpenAPI spec and will need to be regenerated before it can be merged in.',
              '',
              'Run `task engine:tool-models` to regenerate, then commit the updated file.',
            ].join('\n');
            const { data: comments } = await github.rest.issues.listComments({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
            });
            const existing = comments.find(c => c.body.includes(marker));
            if (existing) {
              await github.rest.issues.updateComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                comment_id: existing.id,
                body,
              });
            } else {
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.issue.number,
                body,
              });
            }

      - name: Fail if tool models check failed
        if: steps.tool-models-check.outcome == 'failure'
        run: |
          echo "============================================"
          echo "  Tool Models Check Failed"
          echo "============================================"
          echo ""
          echo "The generated engine/src/stirling/models/tool_models.py"
          echo "is out of date with the Java OpenAPI spec and will"
          echo "need to be regenerated before it can be merged in."
          echo ""
          echo "Run 'task engine:tool-models' to regenerate, then"
          echo "commit the updated file."
          echo "============================================"
          exit 1

      - name: Remove tool models check comment on success
        if: steps.tool-models-check.outcome == 'success' && github.event_name == 'pull_request'
        continue-on-error: true
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        with:
          script: |
            const marker = '<!-- tool-models-check -->';
            const { data: comments } = await github.rest.issues.listComments({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
            });
            const existing = comments.find(c => c.body.includes(marker));
            if (existing) {
              await github.rest.issues.deleteComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                comment_id: existing.id,
              });
            }

      - name: Quality-check engine
        id: engine-check
        run: task engine:check
        continue-on-error: true

      - name: Comment on engine check failure
        # Only post a comment on PRs. github-script's PR helpers need an
        # issue/PR number, which doesn't exist on merge_group runs.
        if: steps.engine-check.outcome == 'failure' && github.event_name == 'pull_request'
        continue-on-error: true
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        with:
          script: |
            const marker = '<!-- engine-check -->';
            const body = [
              marker,
              '### Engine Check Failed',
              '',
              'There are issues with your Python code that will need to be fixed before they can be merged in.',
              '',
              'Run `task engine:fix` to auto-fix what can be fixed automatically, then run `task engine:check` to see what still needs fixing manually.',
            ].join('\n');
            const { data: comments } = await github.rest.issues.listComments({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
            });
            const existing = comments.find(c => c.body.includes(marker));
            if (existing) {
              await github.rest.issues.updateComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                comment_id: existing.id,
                body,
              });
            } else {
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.issue.number,
                body,
              });
            }

      - name: Fail if engine check failed
        if: steps.engine-check.outcome == 'failure'
        run: |
          echo "============================================"
          echo "  Engine Check Failed"
          echo "============================================"
          echo ""
          echo "There are issues with your Python code that"
          echo "will need to be fixed before they can be merged in."
          echo ""
          echo "Run 'task engine:fix' to auto-fix what can be"
          echo "fixed automatically, then run 'task engine:check'"
          echo "to see what still needs fixing manually."
          echo "============================================"
          exit 1

      - name: Remove engine check comment on success
        if: steps.engine-check.outcome == 'success' && github.event_name == 'pull_request'
        continue-on-error: true
        uses: actions/github-script@3a2844b7e9c422d3c10d287c895573f7108da1b3 # v9.0.0
        with:
          script: |
            const marker = '<!-- engine-check -->';
            const { data: comments } = await github.rest.issues.listComments({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
            });
            const existing = comments.find(c => c.body.includes(marker));
            if (existing) {
              await github.rest.issues.deleteComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                comment_id: existing.id,
              });
            }