name: fixtures

on:
    push:
        branches:
            - main
        paths:
            - 'web/src/chat/**'
            - 'web/src/lib/message-window-store.ts'
            - 'web/src/lib/sessionPatch.ts'
            - 'web/src/lib/messages.ts'
            - 'shared/src/**'
            - 'web/scripts/**'
            - 'shared/fixtures/**'
            - '.github/workflows/fixtures.yml'
    pull_request:
        paths:
            - 'web/src/chat/**'
            - 'web/src/lib/message-window-store.ts'
            - 'web/src/lib/sessionPatch.ts'
            - 'web/src/lib/messages.ts'
            - 'shared/src/**'
            - 'web/scripts/**'
            - 'shared/fixtures/**'
            - '.github/workflows/fixtures.yml'

permissions:
    contents: read

concurrency:
    group: fixtures-${{ github.ref }}
    cancel-in-progress: true

jobs:
    drift-gate:
        runs-on: ubuntu-latest
        steps:
            - uses: actions/checkout@v4
            - uses: oven-sh/setup-bun@v2
            - run: bun install --frozen-lockfile
            - name: Regenerate fixtures from the web pipeline
              run: bun run gen:fixtures
            - name: Fail on fixtures drift
              id: drift
              # --intent-to-add makes brand-new fixture files (new cases) visible
              # to git diff; deletions of stale files are visible either way.
              run: |
                  git add --intent-to-add shared/fixtures
                  git diff --exit-code -- shared/fixtures
            - name: Explain drift
              if: failure() && steps.drift.conclusion == 'failure'
              run: echo '::error::web pipeline behavior changed — run `bun run gen:fixtures` and commit the updated fixtures so native ports see the diff'
            - name: Web self-conformance (fixture-related tests)
              # src/lib/sessionPatch matches nothing until K7 lands its tests;
              # vitest unions filters, so the extra filter is future-proof, not fatal.
              run: cd web && bun run test -- src/chat/fixtures.test.ts src/lib/message-window-store.test.ts src/lib/messages.test.ts src/lib/sessionPatch