name: CI

on:
  push:
    branches: [ main, master ]
    tags: [ 'v*' ]
    # No paths-ignore here: tag pushes must always build so a release can be
    # cut even when the tagged commit only touched docs, and a workflow that
    # never triggers would leave a required status check pending forever.
    # Docs-only branch pushes are instead skipped by the `changes` job below,
    # which reports the build jobs as "skipped" (green for branch protection).
  pull_request:
    # No paths-ignore here either: a docs-only PR must still trigger the
    # workflow so the required checks report a status. The `changes` job
    # below diffs the PR against its base and, for a docs-only PR, reports
    # the build jobs as "skipped" — which branch protection accepts as
    # success. With paths-ignore the workflow never ran and the required
    # checks stayed "expected" forever, wedging every docs PR (M-44).
  workflow_dispatch:

# Minimal token: CI only reads the repo and uploads build artifacts, neither of
# which needs write access. Fork PRs run untrusted build scripts on the runner,
# so keep the granted scope as small as possible and never expose secrets here.
permissions:
  contents: read

concurrency:
  group: ci-${{ github.ref }}
  cancel-in-progress: true

# Jobs:
#
#   linux-build   — ubuntu, system GCC. Actually compiles + links (unlike
#                   validate), then packages the Linux bundle (exe + README +
#                   licenses + prepare-assets, NO ROM / assets / bundled libs)
#                   via tools_pc/bundle-linux.sh and uploads it. Surfaces
#                   GCC-on-Linux strictness gaps MinGW misses. Not a runtime
#                   claim; not a required check yet.
#
#   validate      — ubuntu, configure-only. Byte-compiles the tooling,
#                   regenerates the US ROM-asset symbol file, and CMake-
#                   configures ntsc-final (REGION_DEFS, the source list, and
#                   that SDL2 / zlib / OpenGL are discoverable). No ROM is used.
#                   Does NOT compile; running on ubuntu is NOT a claim the port
#                   works on Linux.
#
#   windows-build — windows/MSYS2, the real supported platform. Compiles and
#                   links the full executable, then packages the distributable
#                   bundle (exe + runtime DLLs + README + licenses, NO ROM /
#                   assets) via tools_pc/bundle-win.sh and uploads it. Neither
#                   the ROM nor extracted assets are needed to BUILD (they are
#                   runtime-only), so CI builds but never runs the port.
#
#   release       — tags only (v*). Downloads the Windows + Linux bundles and
#                   attaches both to a DRAFT pre-release for that tag. Draft, so
#                   a human does the ROM smoke-test on each platform and hits
#                   Publish. This is the only job granted contents: write.

jobs:
  # Did this change touch anything outside docs / licenses? No workflow-level
  # paths-ignore exists (see the `on:` comments), so this job is the single
  # place a docs-only push OR pull request is filtered out — a PR is diffed
  # against its base sha, a branch push against `github.event.before`. Tag
  # builds always run. Docs globs: **.md, docs/**, LICENSE, NOTICE.
  changes:
    runs-on: ubuntu-22.04
    outputs:
      code: ${{ steps.filter.outputs.code }}
      # Windows builds default to the self-hosted box (fast, local ccache;
      # docs/dev/notes/SELFHOSTED-RUNNER-PLAN.md §G2) for everything EXCEPT:
      # (a) a release build (tag push) -- keep that on a clean, reproducible
      #     GitHub-hosted runner for the artifact that actually ships, and
      # (b) a fork PR -- untrusted PR code must never reach a box that will
      #     later hold a ROM. Same-repo (non-fork) PRs now also get routed to
      #     self-hosted per the 2026-09-12 standing preference.
      windows_selfhosted: ${{ steps.runner.outputs.selfhosted }}
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          persist-credentials: false
          fetch-depth: 0

      - id: runner
        run: |
          if [ "${GITHUB_REF_TYPE}" = "tag" ]; then
            echo "selfhosted=false" >> "$GITHUB_OUTPUT"
          elif [ "${{ github.event_name }}" = "pull_request" ] && \
               [ "${{ github.event.pull_request.head.repo.full_name }}" != "${{ github.repository }}" ]; then
            echo "selfhosted=false" >> "$GITHUB_OUTPUT"
          else
            echo "selfhosted=true" >> "$GITHUB_OUTPUT"
          fi

      - id: filter
        run: |
          if [ "${{ github.event_name }}" = "pull_request" ]; then
            base='${{ github.event.pull_request.base.sha }}'
            head='${{ github.event.pull_request.head.sha }}'
          elif [ "${{ github.event_name }}" != "push" ] || [ "${GITHUB_REF_TYPE}" = "tag" ]; then
            echo "code=true" >> "$GITHUB_OUTPUT"; exit 0
          else
            base='${{ github.event.before }}'
            head='${{ github.sha }}'
          fi
          if ! git cat-file -e "${base}^{commit}" 2>/dev/null || ! git cat-file -e "${head}^{commit}" 2>/dev/null; then
            echo "no usable base ${base}/head ${head} — building to be safe"
            echo "code=true" >> "$GITHUB_OUTPUT"; exit 0
          fi
          changed="$(git diff --name-only "$base" "$head")"
          echo "Changed files:"; echo "$changed"
          if echo "$changed" | grep -qvE '(\.md$|^docs/|^LICENSE$|^NOTICE$)'; then
            echo "code=true"  >> "$GITHUB_OUTPUT"
          else
            echo "docs-only push — skipping build"
            echo "code=false" >> "$GITHUB_OUTPUT"
          fi

  validate:
    needs: changes
    if: needs.changes.outputs.code == 'true'
    runs-on: ubuntu-22.04
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          persist-credentials: false

      - name: Install dependencies
        run: |
          sudo apt-get update
          sudo apt-get install -y cmake python3 libsdl2-dev zlib1g-dev libgl1-mesa-dev

      - name: Byte-compile Python tooling
        run: python3 -m compileall -q scripts tools_pc

      # Generated dev-docs stay in sync with the tree (speed-ups plan Step 4).
      - name: Check generated dev indexes are current
        run: |
          python3 tools_pc/gen_findings_index.py --check
          python3 tools_pc/gen_env_probes.py --check

      # Docs budget guardrail (ctx-opt P2): warn, don't fail. The §F index
      # table should stay one-liners; fat cell content belongs in `## Dxx`
      # sections at the file tail (lookup path: docs/dev/findings-index.csv).
      - name: Check dev-docs size budgets (warn only)
        run: |
          # Budget = ~55 KB of table rows + ~110 KB of legacy D24–D33 / M-xxx
          # narrative that predates the ctx-opt migration. The signal is fat
          # ROWS re-accumulating, so the threshold sits ~15 KB above today's
          # 166 KB total.
          f=$(awk '/^### F\./{f=1;next} /^### G\./{f=0} f' docs/dev/findings.md | wc -c)
          [ "$f" -le 184320 ] || echo "WARNING: findings.md §F region is $f bytes (> 180 KB) — fat rows accumulating; migrate cell content to ## Dxx sections at the file tail"
          p=$(wc -c < docs/porting-notes.md)
          [ "$p" -le 122880 ] || echo "WARNING: porting-notes.md is $p bytes (> 120 KB) — consider splitting or adding a TOC block"

      # US only. gen_romassets.py resolves every symbol for the US region from
      # the committed CSVs with no ROM present; PAL/JP each need a handful of
      # region-specific prop/font offsets that only come from that region's ROM
      # (see docs/building.md — PAL/JP builders generate romassets_e/j.s
      # locally). No ROM is used or required here.
      - name: Regenerate ROM-asset symbol file (US)
        run: |
          python3 scripts/gen_romassets.py u
          git diff --stat -- port/src/romassets_u.s

      - name: CMake configure (ntsc-final)
        run: cmake -S . -B build-ntsc -DROMID=ntsc-final

  # Linux (Ubuntu, system GCC) compile job. Unlike `validate` this actually
  # runs `cmake --build`, so it surfaces the GCC-on-Linux strictness gaps that
  # MinGW does not flag. The port has never been run on Linux — a green build
  # here is a "does it compile + link" signal only, not a runtime claim.
  # Not a required check yet; flip it to required once it is reliably green.
  #
  # Toolchain: ubuntu-24.04 + gcc-14. The port is developed on MinGW GCC 16;
  # pinning a recent GCC here keeps the first bring-up focused on real
  # portability gaps rather than a decade of accumulated old-GCC pedantry.
  # (A "does it build on the GCC a typical distro ships" pass can come later.)
  linux-build:
    runs-on: ubuntu-24.04
    env:
      CC: gcc-14
      CXX: g++-14
      # CMakeLists.txt opt-in enables CMAKE_{C,CXX}_COMPILER_LAUNCHER=ccache
      # when ccache is on PATH (b4de1c68, speed-ups plan Step 5). Game
      # sources are frozen (1:1 with the decomp), so after the first run only
      # touched port/ files miss cache -- near-total hit rate.
      CCACHE_DIR: ${{ github.workspace }}/.ccache
      CCACHE_MAXSIZE: 500M
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          persist-credentials: false

      - name: Install dependencies
        run: |
          sudo apt-get update
          sudo apt-get install -y build-essential gcc-14 g++-14 cmake python3 \
            python3-pip libsdl2-dev zlib1g-dev libgl1-mesa-dev ccache patchelf

      - name: Restore ccache
        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
        with:
          path: ${{ env.CCACHE_DIR }}
          key: ccache-linux-${{ hashFiles('CMakeLists.txt') }}-${{ github.sha }}
          restore-keys: |
            ccache-linux-${{ hashFiles('CMakeLists.txt') }}-
            ccache-linux-

      - name: Regenerate ROM-asset symbol file (US)
        run: python3 scripts/gen_romassets.py u

      # Drop-in ROM support: freeze the asset-prep tool into a single
      # ge007-convert binary the engine spawns on first run when the
      # pcmodels/pccg sidecars are missing (port/src/romconvert.c). Pure-
      # stdlib scripts, so PyInstaller --onefile is clean; lands in
      # tools_pc/dist/prepare-assets/ where bundle-linux.sh picks it up.
      - name: Freeze asset converter (PyInstaller)
        run: |
          python3 -c "import PyInstaller, sys; sys.exit(PyInstaller.__version__ != '6.22.3')" 2>/dev/null \
            || python3 -m pip install --quiet --break-system-packages pyinstaller==6.22.3
          python3 -m PyInstaller --onefile --noconfirm --clean \
            --name ge007-convert \
            --distpath tools_pc/dist/prepare-assets \
            --workpath build-pyinst --specpath build-pyinst \
            tools_pc/dist/prepare-assets/prepare-assets.py
          ls -la tools_pc/dist/prepare-assets/ge007-convert

      - name: Configure (ntsc-final)
        run: cmake -S . -B build-linux -DROMID=ntsc-final
             -DCMAKE_C_COMPILER=gcc-14 -DCMAKE_CXX_COMPILER=g++-14

      - name: Build (ntsc-final)
        run: cmake --build build-linux -j"$(nproc)"

      - name: ccache stats
        run: ccache -s

      - name: Show binary
        run: |
          ls -la build-linux/ge007* || true
          file build-linux/ge007* || true

      # Package the Linux bundle on every run so the release path stays
      # exercised. SDL2 is bundled (patchelf sets the exe's rpath to $ORIGIN)
      # so the tarball runs as-is on any distro / a sideloaded Steam Deck;
      # zlib + libGL stay system deps. Same ROM / size guards as Windows.
      - name: Package Linux bundle
        run: |
          if [ "${GITHUB_REF_TYPE}" = "tag" ]; then
            V="${GITHUB_REF_NAME}"
          else
            V="0.0.0-ci.${GITHUB_SHA::7}"
          fi
          tools_pc/bundle-linux.sh "$V"

      - name: Upload bundle
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: goldeneye-pc-port-linux-x86_64
          path: |
            dist/*.tar.gz
            dist/*.tar.gz.sha256
          if-no-files-found: error
          retention-days: 14

  # Real Windows (MSYS2 MINGW64) build — the only platform the port is
  # developed and tested on. This compiles and LINKS the full executable.
  #
  # No ROM and no extracted assets are needed to build: the compiled asset set
  # is a handful of committed pure-data .c files plus the generated
  # address-constant romassets_<region>.s. The ROM (.z64) and the ROM-derived
  # blobs are runtime-only dependencies — CI cannot run the game, only build it.
  windows-build:
    needs: changes
    if: needs.changes.outputs.code == 'true'
    # Self-hosted by default (fast, local ccache); windows-latest only for a
    # release (tag) build or a fork PR — see the `changes` job's `runner`
    # step for the exact rule (docs/dev/notes/SELFHOSTED-RUNNER-PLAN.md §G2).
    runs-on: ${{ needs.changes.outputs.windows_selfhosted == 'true' && fromJSON('["self-hosted", "windows"]') || 'windows-latest' }}
    defaults:
      run:
        shell: msys2 {0}
    env:
      # Same opt-in ccache CMakeLists.txt already wires up (Step 5). Note:
      # this cache path is read/written by the JS actions/cache step outside
      # the msys2 shell too, so it stays a plain workspace-relative path
      # rather than an msys /c/... form.
      CCACHE_DIR: ${{ github.workspace }}/.ccache
      CCACHE_MAXSIZE: 500M
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          persist-credentials: false

      # windows-latest (release tag / fork PR) is ephemeral: full install +
      # update every run. Self-hosted (everything else): `release: false`
      # reuses the box's own C:\msys64 as-is and, with update/install both
      # empty here, does no pacman -Syu / pacman -S at all (verified against
      # the action's source) — it only registers the `msys2 {0}` shell
      # wrapper every job needs. Packages themselves are hand-maintained on
      # the box; the dependency check below (not this step) verifies they're
      # present.
      - uses: msys2/setup-msys2@ec48f7c5447b3140e2b088413ae3a55687bccb6e # v2.33.0
        with:
          msystem: MINGW64
          release: ${{ needs.changes.outputs.windows_selfhosted != 'true' }}
          update: ${{ needs.changes.outputs.windows_selfhosted != 'true' }}
          install: ${{ needs.changes.outputs.windows_selfhosted != 'true' && 'mingw-w64-x86_64-toolchain mingw-w64-x86_64-cmake mingw-w64-x86_64-SDL2 mingw-w64-x86_64-zlib mingw-w64-x86_64-python mingw-w64-x86_64-ccache zip unzip' || '' }}

      # Self-hosted only: fails fast with exact install instructions if the
      # box's hand-maintained MSYS2 is missing a required package, instead of
      # a confusing failure deeper in the build. windows-latest just installed
      # everything above, so this would be redundant there.
      - name: Check self-hosted dependencies
        if: needs.changes.outputs.windows_selfhosted == 'true'
        run: tools_pc/check-selfhosted-deps.sh

      - name: Restore ccache
        uses: actions/cache@55cc8345863c7cc4c66a329aec7e433d2d1c52a9 # v6.1.0
        with:
          path: ${{ env.CCACHE_DIR }}
          key: ccache-windows-${{ hashFiles('CMakeLists.txt') }}-${{ github.sha }}
          restore-keys: |
            ccache-windows-${{ hashFiles('CMakeLists.txt') }}-
            ccache-windows-

      - name: Regenerate ROM-asset symbol file (US)
        run: python scripts/gen_romassets.py u

      # Drop-in ROM support: freeze the asset-prep tool into a single
      # ge007-convert.exe the engine spawns on first run when the pcmodels/
      # pccg sidecars are missing (port/src/romconvert.c). Lands in
      # tools_pc/dist/prepare-assets/ where bundle-win.sh picks it up.
      - name: Freeze asset converter (PyInstaller)
        run: |
          # MSYS2's mingw python ships without pip and has ensurepip
          # disabled — install pip from pacman, then PyInstaller.
          python -c "import PyInstaller, sys; sys.exit(PyInstaller.__version__ != '6.22.3')" 2>/dev/null || {
            pacman -S --noconfirm --needed mingw-w64-x86_64-python-pip
            python -m pip install --quiet --break-system-packages pyinstaller==6.22.3
          }
          python -m PyInstaller --onefile --noconfirm --clean \
            --name ge007-convert \
            --distpath tools_pc/dist/prepare-assets \
            --workpath build-pyinst --specpath build-pyinst \
            tools_pc/dist/prepare-assets/prepare-assets.py
          ls -la tools_pc/dist/prepare-assets/ge007-convert.exe

      - name: Build (ntsc-final)
        run: ./build-pc.sh ntsc-final

      # D441 ratchet: fail if the per-file count of 64-bit pointer/int ABI
      # warnings rises relative to tools_pc/abi_baseline.json. Re-baseline
      # locally with `python tools_pc/abi_ratchet.py build-pc --update`.
      - name: ABI warning ratchet (D441)
        run: python tools_pc/abi_ratchet.py build-pc

      - name: ccache stats
        run: ccache -s

      # Package the distributable bundle on every run so the release path is
      # always exercised. On a tag build VERSION is the tag; otherwise it is a
      # throwaway CI string. bundle-win.sh hard-fails if a ROM image or an
      # oversized blob ends up inside the bundle.
      - name: Package Windows bundle
        run: |
          if [ "${GITHUB_REF_TYPE}" = "tag" ]; then
            V="${GITHUB_REF_NAME}"
          else
            V="0.0.0-ci.${GITHUB_SHA::7}"
          fi
          tools_pc/bundle-win.sh "$V"

      - name: Upload bundle
        uses: actions/upload-artifact@043fb46d1a93c77aae656e7c1c64a875d1fc6a0a # v7.0.1
        with:
          name: goldeneye-pc-port-win64
          path: |
            dist/*.zip
            dist/*.zip.sha256
          if-no-files-found: error
          retention-days: 14

      # CI builds and packages the executable but does not run it — running the
      # port needs a ROM, which CI does not provide. Runtime checks (the
      # -level_09 soak, a golden-frame diff) would run on a self-hosted runner
      # instead. Not planned.

  # Tags only. Attach the packaged Windows + Linux bundles to a DRAFT
  # pre-release so a human can do the ROM smoke-test on each platform before
  # publishing. This job — and only this job — gets contents: write, and it
  # is also the only job that attests build provenance (id-token: write +
  # attestations: write; attest-build-provenance needs both).
  release:
    if: github.ref_type == 'tag'
    needs: [ changes, validate, windows-build, linux-build ]
    runs-on: ubuntu-22.04
    permissions:
      contents: write
      id-token: write
      attestations: write
    steps:
      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
        with:
          persist-credentials: false

      # The pushed tag must match the version baked into the exe (the update
      # check compares against it); bump GE007_VERSION in CMakeLists.txt first.
      - name: Check tag matches GE007_VERSION
        run: |
          ver=$(sed -n 's/^set(GE007_VERSION "\([^"]*\)").*/\1/p' CMakeLists.txt)
          if [ -z "$ver" ] || [ "${GITHUB_REF_NAME}" != "v${ver}" ]; then
            echo "tag ${GITHUB_REF_NAME} != v${ver} (CMakeLists.txt GE007_VERSION)"; exit 1
          fi

      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
        with:
          name: goldeneye-pc-port-win64
          path: dist

      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
        with:
          name: goldeneye-pc-port-linux-x86_64
          path: dist

      # SLSA build provenance for the release artifacts (in-toto, signed by
      # GitHub's OIDC key for this repo's workflow at the tagged commit).
      # Anyone can check a downloaded file:
      #   gh attestation verify <file> --repo jkdansereau/goldeneye-pc-port
      - uses: actions/attest-build-provenance@e8998f949152b193b063cb0ec769d69d929409be # v2.4.0
        with:
          subject-path: |
            dist/*.zip
            dist/*.zip.sha256
            dist/*.tar.gz
            dist/*.tar.gz.sha256

      - name: Create or update draft pre-release
        env:
          GH_TOKEN: ${{ github.token }}
        run: |
          TAG="${GITHUB_REF_NAME}"
          ASSETS=(dist/*.zip dist/*.zip.sha256 dist/*.tar.gz dist/*.tar.gz.sha256)
          NOTES="$(mktemp)"
          # Asset names are built from the tag with the leading v stripped
          # (bundle-{linux,win}.sh), so substitute the same form -- a raw
          # TAG would make the notes reference goldeneye-pc-port-v*.* assets
          # that don't exist.
          NOTES_VERSION="${TAG#v}"
          sed "s/<version>/${NOTES_VERSION}/g" .github/release-notes.md > "$NOTES"
          if gh release view "$TAG" >/dev/null 2>&1; then
            gh release upload "$TAG" "${ASSETS[@]}" --clobber
            # Re-stamp the notes body too: it is only set at creation, and
            # release-notes.md may have moved since the draft was first cut.
            gh release edit "$TAG" --notes-file "$NOTES"
          else
            gh release create "$TAG" "${ASSETS[@]}" \
              --draft --prerelease \
              --title "GoldenEye 007 PC Port $TAG" \
              --notes-file "$NOTES"
          fi