# gates — re-run this repo's gate entry point on every push, on a machine that does not care who
# pushed or what they typed.
#
#   *** THIS REPORTS. IT CANNOT REFUSE. ***
#
# felhom repos push straight to `main` with no pull request, so there is no merge for a status
# check to stand at. The refusing half is `.githooks/pre-push`, which is local to a clone and which
# `git push --no-verify` skips; this half is what notices when that happened. Neither half is the
# whole thing, and both are named in felhom.eu documentation/backlog/OPEN-ITEMS.md R-168.
#
# NO `uses:` STEP ANYWHERE, deliberately: JavaScript actions need a node runtime in the runner, and
# the runner is a host-mode container with python3 and git and nothing else (see
# homelab-manifests/gitea-system/act-runner.yaml for why it is not privileged). Probe P3 measured
# that a plain `git fetch` of the pushed SHA from the in-cluster Gitea service is enough.
#
# A failing run must reach a person — a detector nobody hears is the defect R-29 filed, rebuilt one
# layer up. That is the last step, and it runs ONLY on failure.
name: gates
on: [push]

jobs:
  gates:
    runs-on: felhom-gates
    steps:
      - name: Fetch the pushed commit and the sibling clone it needs
        # This repo's entry point invokes a SHARED checker that lives in the felhom.eu clone next
        # door and is deliberately never copied here — so CI has to reproduce the workspace's
        # sibling layout or the gate fails closed with "gate is MISSING". The sibling is also
        # needed for CONTENT: this repo's REUSE.md cites a path that lives in the hub.
        run: |
          # Shallow, and pinned to the exact SHA that was pushed — not to the branch tip,
          # which can move under us if two pushes race.
          mkdir -p ws/felhom-controller
          cd ws/felhom-controller
          git init -q .
          git remote add origin http://gitea.gitea-system.svc.cluster.local:3000/admin/felhom-controller.git
          git fetch -q --depth 1 origin "$GITHUB_SHA"
          git checkout -q FETCH_HEAD
          echo "checked out $(git rev-parse HEAD)"
          cd .. && git clone -q --depth 1 http://gitea.gitea-system.svc.cluster.local:3000/admin/felhom.eu.git felhom.eu
          echo "sibling felhom.eu present at $(cd felhom.eu && git rev-parse --short HEAD)"

      - name: Run the gate entry point
        # The ONLY thing CI runs. No go build, no go test, no linting, no deploy. The
        # exit code IS the result: no `|| true`, no pipe that could swallow it.
        run: cd ws/felhom-controller/controller && python3 scripts/controller_gates.py --fast

      - name: Alarm on failure
        # THE POINT OF THE WHOLE THING. Probe P5 measured that a failed run produces NO mail, NO
        # notification row and NO log line from Gitea itself — a red tick in a web UI nobody watches
        # is exactly the shape R-29 filed against. So the run sends its own alarm, on the project's
        # existing transactional path (Resend, the same one the hub uses), and prints the provider's
        # accepted id so "a message left the machine" is an observable, not an assumption.
        #
        # Pure python3 and urllib, NOT curl: the runner image carries python3 and git and nothing
        # else on purpose, and the first version of this step died on `curl: command not found`.
        # Reaching for a bigger image to send one HTTP request would have been the wrong trade.
        if: failure()
        env:
          RESEND_API_KEY: ${{ secrets.RESEND_API_KEY }}
        run: |
          python3 - <<'PY'
          import json, os, sys, urllib.request, urllib.error

          key = os.environ.get("RESEND_API_KEY", "")
          if not key:
              sys.exit("ALARM FAILED: RESEND_API_KEY is empty — the alarm cannot be sent, and a "
                       "silent alarm is worse than none. Set the user-level Actions secret.")

          repo = os.environ.get("GITHUB_REPOSITORY", "?")
          sha  = os.environ.get("GITHUB_SHA", "?")
          run  = os.environ.get("GITHUB_RUN_NUMBER", "?")
          srv  = os.environ.get("GITHUB_SERVER_URL", "https://gitea.dooplex.hu")

          body = json.dumps({
              "from": "Felhom CI <monitoring@felhom.eu>",
              "to": ["admin@felhom.eu"],
              "subject": "[felhom CI] gates FAILED in %s" % repo,
              "text": (
                  "The gate entry point exited non-zero.\n\n"
                  "Repository : %s\n"
                  "Commit     : %s\n"
                  "Run        : %s/%s/actions/runs/%s\n\n"
                  "The failing gate names itself in the run log.\n\n"
                  "If the local pre-push hook was GREEN for this commit, then CI and the hook\n"
                  "disagree - that is a finding about the gates themselves, not about CI, and it\n"
                  "outranks whatever the push was for.\n"
              ) % (repo, sha, srv, repo, run),
          }).encode()

          req = urllib.request.Request(
              "https://api.resend.com/emails", data=body, method="POST",
              headers={"Authorization": "Bearer %s" % key,
                       "Content-Type": "application/json",
                       # Cloudflare fronts api.resend.com and BLOCKS the default
                       # "Python-urllib/3.x" agent with its own 403 (error 1010) — which looks
                       # exactly like an auth failure and is not one. Measured 2026-08-02.
                       "User-Agent": "felhom-ci/1.0"})
          try:
              with urllib.request.urlopen(req, timeout=30) as r:
                  print("RESEND-ACCEPTED id=%s" % json.load(r)["id"])
          except urllib.error.HTTPError as e:
              sys.exit("ALARM FAILED: Resend returned HTTP %s: %s" % (e.code, e.read().decode()[:300]))
          PY
