name: Model Capability Regenerate-Then-Diff

on:
  pull_request:
    paths:
      - 'scripts/model-capabilities.json'
      - 'scripts/generate-model-capabilities.mjs'
      - 'crates/buzz-agent/src/generated_model_capabilities.rs'
      - 'desktop/src/features/agents/ui/modelCapabilities.ts'
      - 'scripts/generated-model-capabilities-coverage.json'
      - '.github/workflows/model-capability-regen-diff.yml'
      # Differential harness and fixtures — any change to old/new side or inputs re-runs.
      - 'scripts/run-differential.mjs'
      - 'scripts/normative-corpus.json'
      - 'scripts/catalog-sample-fixture.json'
      - 'desktop/src/features/agents/ui/effortTable.fixture.json'
      - 'desktop/src/features/agents/ui/buzzAgentConfig.ts'
      - 'crates/buzz-agent/src/config.rs'
      - 'crates/buzz-agent/src/llm.rs'
  push:
    branches: [main, release, 'duncan/databricks-model-label-registry']

jobs:
  regen-diff:
    name: Regenerate and diff model capability artifacts
    runs-on: ubuntu-latest
    timeout-minutes: 5
    permissions:
      contents: read

    steps:
      - uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6

      - name: Set up Node.js
        uses: actions/setup-node@49933ea5288caeca8642d1e84afbd3f7d6820020 # v4.4.0
        with:
          node-version: '22'
          package-manager-cache: false

      - name: Regenerate artifacts
        run: node scripts/generate-model-capabilities.mjs

      - name: Diff check — fail if generated files are stale
        run: |
          if ! git diff --exit-code \
            crates/buzz-agent/src/generated_model_capabilities.rs \
            desktop/src/features/agents/ui/modelCapabilities.ts \
            scripts/generated-model-capabilities-coverage.json; then
            echo ""
            echo "ERROR: Generated model-capability files are stale."
            echo "Run: node scripts/generate-model-capabilities.mjs"
            echo "Then commit the regenerated files."
            exit 1
          fi
          echo "✓ All generated files are up to date."

      - name: Run corpus (TS interpreter via --experimental-strip-types)
        run: node --experimental-strip-types scripts/run-corpus.mjs

      - name: Validate manifest (schema-negative tests)
        run: node --test scripts/test-manifest-validator.mjs

      - name: Run differential harness (old vs new, all input sets)
        run: node --experimental-strip-types scripts/run-differential.mjs