name: Weekly docs refresh

# Runs the full pipeline: scrape upstream → rebuild indexes → push
# image. Cron'd weekly (Mondays). Skip the reindex + image-push if the
# scrape produced no diff against the committed corpus.
#
# IMPORTANT: actions/checkout@v4 fetch-depth: 0 is required because
# the digest-history step walks git log up to --history-days back.
# With a shallow checkout the history file ships empty.

on:
  schedule:
    - cron: "0 6 * * 1"     # Mondays 06:00 UTC
  workflow_dispatch:
    inputs:
      force_build:
        description: "Rebuild indexes + push image even if corpus is unchanged"
        type: boolean
        default: false

env:
  # If your registry sits behind Cloudflare with its 100 MB body cap,
  # use a LAN endpoint for pushes (bypasses CF) and the public hostname
  # for pulls (response bodies aren't capped).
  REGISTRY_PUSH: <lan-host>:<port>
  REGISTRY_PULL: <public-registry-hostname>
  IMAGE: <owner>/<product>-docs-mcp

  # Embedder. One URL per GPU; the indexer round-robins.
  OLLAMA_URL: http://<gpu-host>:11434
  EMBED_MODEL: nomic-embed-text

  PRODUCT_NAME: <product>

jobs:
  refresh:
    runs-on: docker
    container:
      image: catthehacker/ubuntu:act-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          # Full history — required for the digest-history step to
          # walk git log. Default fetch-depth: 1 silently produces a
          # 0-byte history file.
          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

      # ---- Phase 1: scrape ---------------------------------------
      - name: Refresh bundle catalog
        run: python -m scrape.bundles

      - name: Re-scrape all bundles
        # --force re-fetches every page so we actually see upstream
        # edits. Without it the runner skips pages already on disk.
        run: python -m scrape.runner --all --force --concurrency 6

      # ---- Build the digest history BEFORE committing ------------
      # See PLAN.md Phase 13. Walks recent corpus-touching commits
      # and writes corpus/.digest/history.jsonl. The current refresh
      # gets added on the NEXT run's history (one-week lag is fine).
      - name: Build digest history
        run: |
          mkdir -p corpus/.digest
          python -m scrape.changelog \
              --history-out corpus/.digest/history.jsonl \
              --history-days 120

      # ---- Commit + retry-on-race --------------------------------
      - name: Commit corpus changes (if any)
        id: commit
        run: |
          git config user.name "<product>-docs-refresh"
          git config user.email "actions@<your-domain>"
          git add bundles.json corpus
          if git diff --cached --quiet; then
            echo "no corpus changes — skipping reindex and image build"
            echo "changed=false" >> "$GITHUB_OUTPUT"
            exit 0
          fi
          echo "changed=true" >> "$GITHUB_OUTPUT"
          python -m scrape.changelog --cached > /tmp/changelog.txt
          summary=$(head -1 /tmp/changelog.txt)
          ts=$(date -u +"%Y-%m-%dT%H:%MZ")
          {
            echo "weekly refresh: ${ts} — ${summary}"
            echo ""
            cat /tmp/changelog.txt
          } > /tmp/commitmsg.txt
          git commit -F /tmp/commitmsg.txt
          # Retry on race: if main moved while we were scraping (a
          # human merged a PR during the run), `git push` rejects
          # with "fetch first". Rebase our corpus commit onto new
          # main and retry. Corpus + code paths are disjoint, so
          # the rebase is trivially clean.
          attempt=1
          while [ $attempt -le 3 ]; do
            if git push; then
              echo "pushed corpus changes (attempt $attempt)"
              break
            fi
            if [ $attempt -eq 3 ]; then
              echo "push still failing after 3 attempts — bailing"
              exit 1
            fi
            git fetch origin main
            git rebase origin/main || { echo "rebase conflict — bailing"; exit 1; }
            attempt=$((attempt + 1))
          done

      # ---- Reindex Chroma + BM25 ---------------------------------
      - name: Rebuild indexes
        if: steps.commit.outputs.changed == 'true' || inputs.force_build == true
        run: python -m rag.index --rebuild

      # ---- Build & push image ------------------------------------
      - name: Log in to registry (LAN endpoint)
        if: steps.commit.outputs.changed == 'true' || inputs.force_build == true
        run: echo "${{ secrets.REGISTRY_TOKEN }}" | docker login "${REGISTRY_PUSH}" -u <user> --password-stdin

      - name: Build & push image
        if: steps.commit.outputs.changed == 'true' || inputs.force_build == true
        # Runner shell is /bin/sh — use cut instead of ${VAR::N}.
        # Three tags: :latest (Watchtower target), :<sha12>
        # (rollback pin), :<YYYY.MM.DD> (human-readable).
        run: |
          SHA_TAG=$(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}"

      # ---- Registry GC -------------------------------------------
      - name: Prune old container versions
        if: steps.commit.outputs.changed == 'true' || inputs.force_build == true
        env:
          GITEA_TOKEN: ${{ secrets.REGISTRY_TOKEN }}
        run: |
          python scripts/registry_gc.py \
            --owner <user> \
            --package <product>-docs-mcp \
            --keep-days 90 \
            --keep-latest 5