# CI-01: this repository's FIRST automated check. Before this file, admin/goodwe-addon
# had no `.gitea/workflows/` directory at all - eight runnable test files, ~100 s
# of real coverage including a wall-clock cadence test, and not one machine ever
# ran them. Every merge here was a human reading a diff.
#
# ⚠️ NO `paths:` FILTER, AND ITS ABSENCE IS LOAD-BEARING. Branch protection on
# release/1.0 requires the context `checks / unit (pull_request)`. Gitea leaves a
# required context it never receives PENDING forever, so the moment this workflow
# learns to sit a PR out, that PR becomes unmergeable. Condition a STEP if you
# must; never the workflow.
#
# ⚠️ THE RUNNER IS SHARED WITH THE OTHER REPO'S RIG. `goodwe-runner` on
# 192.168.2.147 carries the labels `self-hosted` and `goodwe-rig` and is
# registered `:host`, and it is the only runner there is - so this job wears the
# rig label without wanting a rig. Nothing below starts, stops, or reads the
# `goodwe-sim` compose project or takes `sim/riglock.py`; it runs one short
# container and exits. It does occupy the runner's single slot (`capacity: 1`),
# so it QUEUES behind a rig campaign - a delayed verdict, never a destroyed one.
#
# NO JS ACTIONS: the runner image has no node, so `actions/checkout` cannot run.
# Checkout is plain git below - and since CI-02 it is a checkout of the MERGE of
# the pull request into its base, not of the branch tip. See the long note on
# that step; a green from this workflow is a claim about content that can land.
name: checks

on:
  pull_request:
    branches: [release/1.0, master]
  workflow_dispatch:

# ⚠️ NO `concurrency:` BLOCK, AND ITS ABSENCE IS AS LOAD-BEARING AS THE MISSING
# `paths:` FILTER ABOVE. CI-01 put one here - `group: addon-checks-<pr number>`,
# `cancel-in-progress: true` - to stop a second pull request superseding a
# first one's run. It did stop that. It also did this, twice, on PR #14:
#
#   run 531  created 17:08:19  `pending / Waiting to run`
#            cancelled 17:10:44  <- the exact second run 532 was created
#   run 533  created 17:45:11  `pending / Waiting to run`
#            cancelled 18:11:22  <- the exact second run 534 was created
#
# Both cancelled runs have `started_at` at the Unix epoch: they never executed.
# A cancelled run posts `failure` on the required context, described
# `Canceled after 0s`. Branch protection compares STATE, not description, so
# "nothing ran" and "your tests are broken" arrive at the gate as the same red,
# and the correct operator response to each is the opposite of the other.
#
# CI-02 MEASURED THE THREE CANDIDATE SETTINGS ON A THROWAWAY PR (#29) RATHER
# THAN READING THE DOCS, because the docs and this Gitea disagree about which
# knob does it. In each trial one run was made to hold the single slot and two
# further pushes followed:
#
#   trial 1, NO concurrency block   - runs 561 and 562 both sat queued together
#                                     and both executed. Nothing was cancelled.
#   trial 2, group kept, cancel-in-progress: FALSE
#                                   - run 564 sat `pending / Blocked by required
#                                     conditions` and was cancelled at 0s the
#                                     second run 565 was created.
#
# So `cancel-in-progress` IS NOT THE KNOB. A shared group cancels a run that has
# not started no matter what that flag says - GitHub documents this ("any
# previously pending run in the group will be cancelled") and Gitea 1.27
# implements it. The only configuration that leaves a queued run alive is having
# no group at all, which is what is written here.
#
# ⚠️ DO NOT REPLACE THIS WITH A SHA-KEYED GROUP as a compromise. It looks
# tempting - two runs on different commits could never share a group, so nothing
# would be cancelled - but the only cancellations it still permits are the
# same-sha ones, and those are precisely the dangerous half: a red for a run
# that never started, landing on a commit that IS still the head. It
# concentrates the failure instead of removing it.
#
# WHAT THIS COSTS, stated honestly: the runner is `capacity: 1` and shared with
# the other repo's rig, so a developer who pushes four times in a minute now
# occupies it four times instead of once. That is CI-01's own trade written the
# other way round - it accepted "a delayed verdict, never a destroyed one" for
# the rig, and this accepts the same for pushes. A destroyed verdict here is
# worse than a slow one, because it is indistinguishable from a real failure.

jobs:
  unit:
    runs-on: [self-hosted, goodwe-rig]
    timeout-minutes: 70   # ~4 to run; the rest is queueing for the single slot
    env:
      # ⚠️ UNDER /home/homelab, NOT $GITHUB_WORKSPACE (ENV-01, and re-measured
      # during CI-01). act's workspace is `/root/.cache/act/<id>/hostexecutor`, a
      # path that exists only INSIDE the runner container. Hand it to the host's
      # snap-confined dockerd and the build fails with "failed to read
      # dockerfile", or - worse, and this is the documented case - a bind mount
      # resolves to an EMPTY DIRECTORY with no error at all. /home/homelab is
      # mirrored 1:1 into the runner and is under $HOME, where snap confinement
      # accepts it. The same probe under /tmp failed and under $HOME succeeded.
      WS: /home/homelab/ci/addon-checks-${{ github.run_number }}
    steps:
      # ⚠️ THE CHECKOUT IS TWO LEVELS BELOW THE MOUNT ROOT, DELIBERATELY.
      # test_freeze.py's find_hwsim() reads `HERE.parents[1] / "goodwe" / "sim"`,
      # looking for the infra repo as a SIBLING of this one. Check out flat -
      # goodwe_controller directly at the mount root - and `parents[1]` does not
      # exist, so the test dies on `IndexError: 1` before its first assertion.
      # Measured during CI-01; the flat layout was tried first and did exactly
      # that. $WS/goodwe-addon/goodwe_controller gives parents[1] == $WS.
      #
      # ⚠️ WHAT THIS CHECKS OUT IS THE MERGE, NOT THE BRANCH, AND THAT IS THE
      # WHOLE OF CI-02. What was here before was one line:
      #
      #   git fetch -q --depth 1 origin "$GITHUB_REF" \
      #     || git fetch -q --depth 1 origin "$GITHUB_SHA"
      #
      # CI-02 measured what those two names actually are on this Gitea, on a
      # deliberately conflicted throwaway PR (#29, runs 558 and 559), by asking
      # one question per STEP - the Actions log endpoints 404 here, so a step's
      # own conclusion is the only channel out of a job. The answers:
      #
      #   GITHUB_REF == refs/pull/<n>/head        (step P01 passed)
      #   GITHUB_REF != refs/pull/<n>/merge       (step P02 failed)
      #   GITHUB_SHA == the pull request head sha (step P03 passed)
      #   fetching GITHUB_REF succeeds            (step P04 passed)
      #   ...and lands on the bare head           (step P05 passed)
      #   refs/pull/<n>/merge does not exist      (step P06 failed)
      #
      # ⚠️ SO THE FALLBACK NEVER FIRED, AND THE DEFECT IS WORSE THAN THE ONE
      # REPORTED. The ticket says a conflicted PR loses its merge ref and the
      # `||` quietly grades the bare head instead. It does not: this Gitea has
      # no merge refs at all - `git ls-remote origin 'refs/pull/*'` advertises
      # only `/head`, for open and closed pull requests alike - so the FIRST
      # half always succeeds, and both halves name the same commit anyway
      # (GITHUB_REF resolves to GITHUB_SHA). The gate has never once graded
      # merged content, on any pull request in this repository's history. Green
      # has meant "this branch passed on its own", which on a base that has
      # moved - and `block_on_outdated_branch` is off here, so it usually has -
      # is not the content that lands. PR #14 reporting success while
      # `mergeable: false` was not the fallback misfiring; it was the gate
      # working exactly as written.
      #
      # A fallback that cannot fire cannot be "kept for the case it was for", so
      # it is gone from this path and kept, ANNOUNCED, on the one path that has
      # no pull request to merge (workflow_dispatch, below).
      #
      # ⚠️ NOT `--depth 1` ANY MORE. A merge needs the merge base, and a shallow
      # pair does not have one. Measured before changing it: a full fetch of
      # this repository is 6.8 MB and 1.1 s against this server, over 95
      # commits. The depth flag was buying nothing worth a wrong verdict.
      #
      # ⚠️ THE WORKFLOW AND THE CONTENT NOW COME FROM DIFFERENT TREES. Gitea
      # picks the workflow file from refs/pull/<n>/head, so THIS file is always
      # the branch's; the tree graded below - including .gitea/ci/Dockerfile -
      # is the merge. That is the right way round (a pull request must not be
      # able to grade itself with a gate the base has not seen) but it means a
      # change to this file is tested by the branch it is on, which is how you
      # are reading this.
      - name: check out the base branch and the pull request head (git; no node for actions/checkout)
        env:
          URL: ${{ github.server_url }}/${{ github.repository }}.git
          TOKEN: ${{ secrets.GITHUB_TOKEN }}
          PRNUM: ${{ github.event.pull_request.number }}
          BASEREF: ${{ github.base_ref }}
        run: |
          set -eu
          rm -rf "$WS" && mkdir -p "$WS/goodwe-addon" && cd "$WS/goodwe-addon"
          git init -q .
          git remote add origin "$(echo "$URL" | sed "s#://#://x-access-token:${TOKEN}@#")"
          if [ -n "$PRNUM" ]; then
            # Two fetches, not one, so that a failure to reach either ref fails
            # HERE with the ref in the message, rather than inside the merge
            # step where it would read as a conflict. `github.base_ref` being
            # populated at all was checked on the probe PR too (step Q01).
            git fetch -q origin "+refs/heads/$BASEREF:refs/remotes/origin/base"
            git fetch -q origin "+refs/pull/$PRNUM/head:refs/remotes/origin/pr"
            git checkout -qf refs/remotes/origin/base
            echo "base  $BASEREF                $(git rev-parse refs/remotes/origin/base)"
            echo "head  refs/pull/$PRNUM/head   $(git rev-parse refs/remotes/origin/pr)"
          else
            # NO PULL REQUEST (workflow_dispatch). There is nothing to merge
            # into, so this path grades a bare ref and SAYS SO - which is all
            # the old `||` ever needed to do. It is kept here because a branch
            # can be deleted or renamed between the dispatch and the fetch, and
            # unlike the pull_request path that is a case nobody has ruled out.
            if git fetch -q origin "$GITHUB_REF"; then
              echo "GRADED: the bare ref $GITHUB_REF - NOT merged content (no pull request in this event)."
            else
              git fetch -q origin "$GITHUB_SHA"
              echo "GRADED: the bare commit $GITHUB_SHA - NOT merged content, and NOT $GITHUB_REF either, which would not fetch."
            fi
            git checkout -qf FETCH_HEAD
          fi
          echo "checked out $(git log --oneline -1)"

      # ⚠️ THIS STEP IS THE ONE THAT MAKES A GREEN MEAN SOMETHING. It exists as
      # its OWN step rather than as three lines of the checkout because the
      # Actions log endpoints 404 on this Gitea and
      # /api/v1/repos/.../actions/runs/<id>/jobs - which carries a per-step
      # conclusion - is the only machine-readable account of what a run did. A
      # reader who sees this step red knows the pull request does not apply and
      # that NO TEST RAN; a reader who sees the next two red knows the tests ran
      # and spoke. Collapse them back together and that distinction is gone
      # again, which is the shape of defect this whole ticket is about.
      #
      # The refusal is a FAILURE rather than a skip on purpose. "Reports
      # nothing" would leave the required context pending forever, which this
      # file's own header explains is unmergeable-forever; and a conflicted pull
      # request cannot be merged by Gitea anyway, so the red blocks nothing that
      # was not already blocked. What it does is stop a green being posted about
      # content that cannot land.
      - name: grade the merge, not the branch - refuse a pull request that does not apply
        env:
          PRNUM: ${{ github.event.pull_request.number }}
          BASEREF: ${{ github.base_ref }}
        run: |
          set -eu
          cd "$WS/goodwe-addon"
          if [ -z "$PRNUM" ]; then
            echo "no pull request in this event - nothing to merge, and the previous step said what it graded."
            exit 0
          fi
          if git -c user.email=checks@localhost -c user.name=checks \
               merge --no-edit refs/remotes/origin/pr; then
            echo "GRADED: refs/pull/$PRNUM/head merged into $BASEREF"
            echo "        result  $(git rev-parse HEAD)"
            echo "        tree    $(git rev-parse 'HEAD^{tree}')"
          else
            git merge --abort 2>/dev/null || true
            echo "REFUSED: refs/pull/$PRNUM/head does not merge into $BASEREF."
            echo "         NOTHING HAS BEEN TESTED. This is not a test failure - no test ran."
            echo "         Rebase or merge $BASEREF into the branch and push again."
            exit 1
          fi

      - name: build the test image (shipped deps, from apk - see .gitea/ci/Dockerfile)
        run: |
          set -eu
          docker build -q -t goodwe-addon-checks:1 "$WS/goodwe-addon/.gitea/ci" >/dev/null
          docker run --rm goodwe-addon-checks:1 python3 -c \
            'import aiohttp, paho.mqtt.client as m, sys; print("python", sys.version.split()[0], "aiohttp", aiohttp.__version__)'

      # ⚠️ THE FILE LIST IS DERIVED FROM THE TREE, NOT TYPED HERE. A hand-written
      # list is how a new test file joins the repo and is never run - the exact
      # shape of failure this ticket exists to close. The step globs `test_*.py`,
      # prints the count, and REFUSES A COUNT OF ZERO: a loop over an empty glob
      # exits 0 and would report a green gate that examined nothing.
      #
      # ⚠️ test_loop.py TAKES ~93 SECONDS OF WALL CLOCK ON PURPOSE (its own
      # docstring says so, and says why: it drives the real `run_control()`
      # against a real wall-clock floor, and mocking the clock would leave the
      # assertion testing the mock). It is not hung. Do not "fix" it with a
      # shorter timeout - a 60 s limit was tried during CI-01 and reported
      # exactly the false hang the docstring predicts.
      #
      # ⚠️ WHAT THIS RUN DOES NOT COVER, stated because a pass here would
      # otherwise over-claim. test_freeze.py's third section wants the infra
      # repo's `sim/hwsim.py` to drive a real HTTP meter through the real
      # transport. admin/goodwe is PRIVATE (checked via the API) and this
      # workflow's GITHUB_TOKEN is minted for THIS repository only, so hwsim is
      # absent here and `find_hwsim()` returns None. The rest of the file runs
      # and passes. It does so SILENTLY - the file prints nothing to say the
      # hwsim section was skipped - so "test_freeze.py: PASS" below is a weaker
      # claim than it looks. That belongs to whoever owns test_freeze.py next;
      # naming it here is the least this gate can do about it.
      # ⚠️ PYTHONDONTWRITEBYTECODE=1 IS BELT AND BRACES, NOT A FIX FOR A LIVE
      # HOLE. TEST-15 measured this runner's actual exposure and found none: the
      # checkout below is bind mounted `:ro`, so the interpreter physically
      # cannot write a __pycache__ into the tree it is grading - it fails
      # SILENTLY, no error and exit status 0 - and every job `rm -rf`s $WS and
      # clones afresh, so nothing survives from a previous job on this shared
      # runner either. The variable is here because the `:ro` is the load-bearing
      # part and it is one character wide: delete it while debugging a write and
      # the gate quietly starts caching bytecode across a rebuild again. Note
      # what it does NOT do, per TEST-15 part 2 - it stops bytecode being
      # WRITTEN, never a stale one being READ. It is not a substitute for the
      # purge in goodwe_controller/tools/mutation_run.sh.
      - name: the add-on's own tests
        run: |
          set -eu
          docker run --rm -e PYTHONDONTWRITEBYTECODE=1 -v "$WS:/w:ro" goodwe-addon-checks:1 sh -eu -c '
            cd /w/goodwe-addon/goodwe_controller
            set -- test_*.py
            if [ "$1" = "test_*.py" ]; then
              echo "NO test_*.py FOUND - the mount is empty or the layout moved. NOTHING has been checked."
              exit 1
            fi
            echo "$# test file(s) to run"
            rc=0
            for f in "$@"; do
              start=$(date +%s)
              if python3 "$f" > /tmp/out 2>&1; then
                echo "PASS  $f  ($(( $(date +%s) - start ))s)"
              else
                echo "FAIL  $f  ($(( $(date +%s) - start ))s)"
                tail -40 /tmp/out
                rc=1
              fi
            done
            exit $rc
          '

      - name: clean up
        if: always()
        run: |
          rm -rf "$WS" || true
          # Root-owned by this runner inside a directory the `homelab` user owns,
          # and sudo on that box is interactive-only, so the user cannot clean
          # this up and the job that made it has to.
          ls -1dt /home/homelab/ci/addon-checks-*/ 2>/dev/null | tail -n +6 | xargs -r rm -rf || true