name: Image rebuild (skip scrape)

# Fast path for code-only changes. Skips the scrape and goes straight to:
# rebuild indexes (from corpus already committed on main) + image build
# + push. Runtime is ~18 min vs ~40 min for the full refresh.
#
# Use when a PR only changes code/config — anything where the upstream
# corpus hasn't moved but we want the new Python in the running image.
#
# IMPORTANT: fetch-depth: 0 is required for the digest-history step
# to find commits to walk. Don't change to 1.

on:
  workflow_dispatch:

env:
  REGISTRY_PUSH: <lan-host>:<port>
  REGISTRY_PULL: <public-registry-hostname>
  IMAGE: <owner>/<product>-docs-mcp
  OLLAMA_URL: http://<gpu-host>:11434
  EMBED_MODEL: nomic-embed-text
  PRODUCT_NAME: <product>

jobs:
  build:
    runs-on: docker
    container:
      image: catthehacker/ubuntu:act-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          # Full history (not shallow) so the digest-history step can
          # walk git log up to --history-days back.
          fetch-depth: 0

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

      - name: Install dependencies
        run: |
          python -m pip install -q --upgrade pip
          python -m pip install -q -r requirements.txt

      - name: Refresh digest history
        # Cheap (a few seconds); doesn't touch corpus content.
        # Without this step, a code-only deploy would ship an
        # increasingly-stale digest history relative to git.
        run: |
          mkdir -p corpus/.digest
          python -m scrape.changelog \
              --history-out corpus/.digest/history.jsonl \
              --history-days 120

      - name: Verify committed corpus is present
        run: |
          test -d corpus || { echo "ERROR: corpus/ missing on this ref"; exit 1; }
          echo "corpus: $(du -sh corpus | cut -f1), $(find corpus -name '*.md' | wc -l) markdown files"

      - name: Rebuild indexes from existing corpus
        run: python -m rag.index --rebuild

      - name: Log in to registry (LAN endpoint)
        run: echo "${{ secrets.REGISTRY_TOKEN }}" | docker login "${REGISTRY_PUSH}" -u <user> --password-stdin

      - name: Build & push image
        run: |
          SHA_TAG=$(echo "$GITHUB_SHA" | cut -c1-12)
          DATE_TAG=$(date -u +%Y.%m.%d)
          docker build \
            -t "${REGISTRY_PUSH}/${IMAGE}:latest" \
            -t "${REGISTRY_PUSH}/${IMAGE}:${SHA_TAG}" \
            -t "${REGISTRY_PUSH}/${IMAGE}:${DATE_TAG}" \
            .
          docker push "${REGISTRY_PUSH}/${IMAGE}:latest"
          docker push "${REGISTRY_PUSH}/${IMAGE}:${SHA_TAG}"
          docker push "${REGISTRY_PUSH}/${IMAGE}:${DATE_TAG}"

      - name: Prune old container versions
        env:
          GITEA_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
        run: |
          python scripts/registry_gc.py \
            --owner <user> \
            --package <product>-docs-mcp \
            --keep-days 90 \
            --keep-latest 5