# Gate every pull request into `main` on a fast, DB-free check suite, so a broken
# build or a failing test can't reach the branch that gets released.
#
# Mirrors RunicGateway/website's pr-checks.yml — this module is two npm packages
# shaped like that repo's `server/` and `client/`, and it is loaded into that
# repo's process, so it is checked the same way with the same Node version.
#
# ── What each job is really asking ───────────────────────────────────────────
#
# The tests are the ordinary half. The two `check:*` scripts are the interesting
# one, because they are the acceptance criteria of the module contract itself
# (docs/website/MODULE_API.md Part 5) rather than of this module's behaviour:
#
#   • `server: check:imports` — no relative path escapes the module root, and no
#     shipped file resolves a bare specifier. A module that reaches into core's
#     tree works right up until core moves a file, and the whole boundary is
#     worth exactly as much as this check is (§5.1).
#
#   • `client: check:externals` — the BUILT chunk has no bare imports left. That
#     failure is invisible in source: `import { useState } from 'react'` is
#     correct in every file, and whether it becomes core's React or a bare
#     specifier no browser can resolve is decided by vite.config.js. It has to
#     be asked of the artifact, so it runs after the build. (The other half —
#     a shared dependency being BUNDLED — fails the build itself, from a
#     resolution-time guard inside vite.config.js.)
#
# Building the chunk in CI is not only a check: it is how the chunk that ships is
# produced, since an operator never builds (MODULE_SYSTEM.md §1.14).
#
#   • `server: check:swagger` — `swagger-fragment.json` describes the routes this
#     module registers, today. Core has no way to generate it: core is a prebuilt
#     image, this module arrived on a volume afterwards, and it mounts through a
#     call no static parser can follow. So the fragment core merges into
#     `/api/docs.json` is whatever this repo committed, and a stale one documents
#     a URL surface that does not exist (§2.8).
#
#   • `frozen-manifest` — the job with the interesting shape. It clones CORE at
#     the ref pinned in `ci/core-ref.json`, generates its route manifest twice
#     (without this module, then with) and takes the difference. That difference
#     is what this module serves, and it is checked three ways: it must match the
#     committed `routes.manifest.json`, it must not have REMOVED or changed one of
#     core's own routes, and every route in it must have an operation in
#     `swagger-fragment.json` — the per-module form of core's rule that a route
#     which isn't in the spec doesn't ship (§5.3, §2.8).
#
#     Nothing else can ask those questions. Every other check here runs against
#     this repo alone, where a mount prefix is a string in `server/index.js` and a
#     documented path is a string in a JSON file; whether they name the same URL
#     is a fact about a running core, and this is the only job that has one.
#
# Still not here, deliberately: nothing. The release workflow is
# `.gitea/workflows/release.yml` and runs on a tag rather than on a PR.
#
# Enforcement (one-time, in the Gitea UI):
#   Repository Settings → Branches → Branch Protection (rule for `main`)
#     • Enable Status Check
#     • Status check patterns:  PR Checks / *
#   Note: Gitea only lists a context in its dropdown after it has reported once,
#   so let this workflow run on one PR first. The `PR Checks / *` glob matches
#   without needing the dropdown, and keeps matching as jobs are added.
#
# Runner: the shared self-hosted `ubuntu-latest` runner. These jobs need only
# Node — no Docker socket, no database.

name: PR Checks

on:
  pull_request:
    branches: [main]

# A newer push to the same PR cancels the in-flight run.
concurrency:
  group: pr-checks-${{ github.ref }}
  cancel-in-progress: true

# npm's own retry, turned up. The shared runner reads ETIMEDOUT from the registry
# often enough to matter, and there are five `npm ci` calls across these jobs — a
# red X that means "the network hiccuped" costs a reviewer more than it costs the
# runner to retry, and teaches everyone to re-run rather than read a failure.
env:
  NPM_CONFIG_FETCH_RETRIES: 5
  NPM_CONFIG_FETCH_RETRY_MINTIMEOUT: 20000
  NPM_CONFIG_FETCH_RETRY_MAXTIMEOUT: 120000

jobs:
  server-tests:
    runs-on: ubuntu-latest
    timeout-minutes: 20
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-node@v4
        with:
          node-version: 20
          cache: npm
          cache-dependency-path: server/package-lock.json

      # `npm ci` rather than `npm install`: it also proves the lockfile is in
      # sync with package.json instead of silently updating it.
      - name: Install server deps
        run: npm ci --prefix server

      - name: Run server tests
        run: npm test --prefix server

      - name: Check the module boundary (MODULE_API.md §5.1)
        run: npm run check:imports --prefix server

      - name: Check the OpenAPI fragment is current (MODULE_API.md §2.8)
        run: npm run check:swagger --prefix server

  client-build:
    runs-on: ubuntu-latest
    timeout-minutes: 20
    steps:
      - uses: actions/checkout@v4

      - uses: actions/setup-node@v4
        with:
          node-version: 20
          cache: npm
          cache-dependency-path: client/package-lock.json

      - name: Install client deps
        run: npm ci --prefix client

      # The build comes FIRST, and that ordering is load-bearing as of slice 3.
      # Two of the client tests read `dist/entry.js` — the chunk's externals, and
      # what it registers when imported against a fake `window.__rg` — and both
      # skip when there is no build. Run the other way round they skip silently
      # in CI, which is the worst of both: green, and not asking the question.
      - name: Build the client chunk
        run: npm run build --prefix client

      - name: Run client tests
        run: npm test --prefix client

      - name: Check the built chunk's externals (MODULE_API.md §3.6)
        run: npm run check:externals --prefix client

  # ── The URLs this module actually serves ──────────────────────────────────
  #
  # Everything above proves the module against itself. This proves it against a
  # real core: the one place where "the prefix I register" and "the path I
  # document" are the same fact rather than two strings that ought to agree.
  #
  # The module is COPIED into the core checkout, never symlinked — core's loader
  # filters its scan with `entry.isDirectory()`, which reports a link as a link
  # and skips it silently, so a symlinked module produces a manifest with no
  # module routes in it and a diff that looks like the module registering
  # nothing.
  frozen-manifest:
    runs-on: ubuntu-latest
    timeout-minutes: 20
    steps:
      - uses: actions/checkout@v4
        with:
          path: module

      - uses: actions/setup-node@v4
        with:
          node-version: 20

      # Anonymous HTTPS, and a full clone rather than a shallow one: the pin is a
      # commit sha, and `--depth 1` can only fetch a branch tip.
      - name: Clone core at the pinned ref (MODULE_API.md §5.3)
        run: |
          REPO=$(node -p "require('./module/ci/core-ref.json').repo")
          REF=$(node -p "require('./module/ci/core-ref.json').ref")
          echo "core: $REPO @ $REF"
          git clone --quiet "$REPO" core
          git -C core checkout --quiet "$REF"

      - name: Install core's server deps
        run: npm ci --prefix core/server

      # Core alone. `--check` first, so a pin that no longer regenerates its own
      # committed manifest fails HERE, naming the pin, instead of showing up below
      # as this module having removed a route it never touched.
      - name: Generate core's manifest without this module
        run: |
          npm run routes:manifest --prefix core/server -- --check
          cp core/server/routes.manifest.json before.json

      # The chunk has to exist before the loader will accept the module at all —
      # `client.entry` is validated during the manifest step of the scan, and a
      # missing one is a load failure, not a warning.
      - name: Build the client chunk
        run: |
          npm ci --prefix module/client
          npm run build --prefix module/client

      - name: Install the module into core
        run: |
          mkdir -p core/modules/uo
          tar -C module --exclude=.git --exclude=node_modules -cf - . | tar -C core/modules/uo -xf -
          npm ci --omit=dev --prefix core/modules/uo/server

      - name: Generate core's manifest with this module
        run: |
          npm run routes:manifest --prefix core/server
          cp core/server/routes.manifest.json after.json

      - name: Check the frozen manifest and the fragment's coverage
        working-directory: module
        run: node server/scripts/frozenManifest.js --before ../before.json --after ../after.json --check