name: CI

on:
  push:
    branches: [main]
  pull_request:
  workflow_dispatch:

# A new push supersedes the one before it on the same ref.
concurrency:
  group: ${{ github.workflow }}-${{ github.ref }}
  cancel-in-progress: true

# Least privilege by default; jobs opt into more where they need it.
permissions:
  contents: read

jobs:
  check:
    name: Typecheck, test, feed
    runs-on: ubuntu-latest
    steps:
      - uses: https://github.com/actions/checkout@v4

      - uses: https://github.com/oven-sh/setup-bun@v2
        with:
          bun-version: "1.3"

      - run: bun install --frozen-lockfile

      # `lastConfirmedAt` — the "we asked the wiki and it said this is still
      # current" half of the freshness badge — lives in the gitignored
      # snapshots/*.state.json, so without this the feed built here has only
      # `contentChangedAt` to go on and every source reads as stale two days
      # after its bytes last moved, which for a wiki page is most of the time.
      # Restore-only: refresh.yml owns writing this cache, and a miss just
      # returns the pre-existing fallback behaviour.
      - name: Restore refresh bookkeeping
        uses: https://github.com/actions/cache/restore@v4
        with:
          path: snapshots/*.state.json
          key: refresh-state-
          restore-keys: refresh-state-

      - name: Typecheck
        run: bun run typecheck

      - name: Test
        # Offline by design: no fixture is re-fetched, so a red run always means
        # the code changed, never that a source was unreachable.
        run: bun test

      - name: Build feed
        run: bun run build:feed

      - name: Feed sanity
        # A source that quietly stops yielding events is the failure mode a
        # parser-only pipeline is most prone to, and nothing else surfaces it.
        run: |
          bun -e '
            const feed = await Bun.file("public/data/events.v1.json").json();
            const games = new Set(feed.events.map((e) => e.game));
            console.log(`${feed.events.length} events across ${games.size} games`);
            for (const s of feed.sources) {
              console.log(`  ${s.sourceId.padEnd(24)} ${String(s.eventCount).padStart(3)}`);
            }
            if (feed.events.length < 20) {
              throw new Error(`feed collapsed to ${feed.events.length} events`);
            }
            if (feed.events.some((e) => !e.startsAt)) {
              throw new Error("events without a start date");
            }
            // Per source, not just in total: nine healthy sources hide a tenth
            // that has gone to zero, and the total stays comfortably over the
            // floor while one game shows an empty calendar.
            //
            // Which zero it is decides whether this build should fail, and
            // the rule lives in shared/feed.ts rather than here. It was
            // inline, and a test did pin it — by grepping this file for the
            // string. That proved the check existed, never that it was right,
            // and it was not: it read eventCount, which is counted after
            // expiry, so a page whose events had all simply ended reddened the
            // build. Behaviour belongs where behaviour can be exercised.
            const { brokenSources, quietSources, staleSources } = await import("./src/shared/feed.ts");
            for (const s of staleSources(feed.sources)) {
              console.log(
                `  note: ${s.sourceId} parsed ${s.parsedCount} events, all of them ended — stale page, not a fault`,
              );
            }
            for (const s of quietSources(feed.sources)) {
              console.log(
                `  note: ${s.sourceId} parsed nothing and the page says so itself — between versions, not a fault`,
              );
            }
            const broken = brokenSources(feed.sources);
            if (broken.length > 0) {
              throw new Error(
                `sources parsing to nothing: ${broken.map((s) => s.sourceId).join(", ")}`,
              );
            }
          '

  build:
    name: Build site
    runs-on: ubuntu-latest
    needs: check
    steps:
      - uses: https://github.com/actions/checkout@v4
      - uses: https://github.com/oven-sh/setup-bun@v2
        with:
          bun-version: "1.3"
      - run: bun install --frozen-lockfile

      # This is the job whose output is deployed, so this is the one that must
      # see the refresh bookkeeping; see the same step in `check`.
      - name: Restore refresh bookkeeping
        uses: https://github.com/actions/cache/restore@v4
        with:
          path: snapshots/*.state.json
          key: refresh-state-
          restore-keys: refresh-state-

      - name: Build
        # Built at the domain root, because the container image is what gets
        # deployed and `serve.ts` serves from `/`. A BASE_PATH belongs here only
        # if this artefact is ever hosted under a subpath again — it was set to
        # /<repo>/ for GitHub Pages, which this pipeline no longer deploys to.
        run: bun run build
      - uses: https://github.com/actions/upload-artifact@v4
        with:
          name: site
          path: public/
          retention-days: 7

  image:
    name: Container image
    runs-on: ubuntu-latest
    needs: check
    # Pushing an image for every pull request fills the registry; do it where
    # the artefact could actually be deployed.
    if: github.ref == 'refs/heads/main' && github.event_name != 'pull_request'
    permissions:
      contents: read
      packages: write
    steps:
      - uses: https://github.com/actions/checkout@v4

      - uses: https://github.com/docker/setup-buildx-action@v3

      - name: Lowercase image name
        id: img
        # Gitea's container registry, like GHCR before it, rejects any uppercase
        # in a repository name, and github.repository preserves the owner's
        # casing verbatim. The host is read from github.server_url rather than
        # hardcoded, so a fork on another Gitea instance pushes to its own
        # registry instead of this one.
        env:
          SERVER_URL: ${{ github.server_url }}
        run: |
          host="${SERVER_URL#https://}"
          host="${host#http://}"
          host="${host%%/*}"
          # Two outputs on purpose: login wants the bare host, the tags want the
          # full path. Passing the full path as the registry authenticates
          # against a host that does not exist.
          echo "host=${host}" >> "$GITHUB_OUTPUT"
          echo "name=${host}/${GITHUB_REPOSITORY,,}" >> "$GITHUB_OUTPUT"

      - uses: https://github.com/docker/login-action@v3
        with:
          registry: ${{ steps.img.outputs.host }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - uses: https://github.com/docker/build-push-action@v6
        with:
          context: .
          push: true
          tags: |
            ${{ steps.img.outputs.name }}:latest
            ${{ steps.img.outputs.name }}:${{ github.sha }}
          # Registry cache rather than `type=gha`. Gitea does expose the Actions
          # cache API, but buildx's gha backend is the least reliable corner of
          # that compatibility surface, and we are already authenticated to a
          # registry that can hold the layers.
          cache-from: type=registry,ref=${{ steps.img.outputs.name }}:buildcache
          cache-to: type=registry,ref=${{ steps.img.outputs.name }}:buildcache,mode=max