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 }}
    steps:
      - uses: actions/checkout@v7
        with:
          persist-credentials: false
          fetch-depth: 0

      - 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@v7
        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

      # 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
    steps:
      - uses: actions/checkout@v7
        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 \
            libsdl2-dev zlib1g-dev libgl1-mesa-dev

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

      - 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: 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. No shared libs are bundled — the README tells the user to
      # install SDL2 / zlib / libGL from their distro. Same ROM / size guards
      # as the Windows bundle.
      - 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@v7
        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'
    runs-on: windows-latest
    defaults:
      run:
        shell: msys2 {0}
    steps:
      - uses: actions/checkout@v7
        with:
          persist-credentials: false

      - uses: msys2/setup-msys2@v2
        with:
          msystem: MINGW64
          update: true
          install: >-
            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
            zip
            unzip

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

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

      # 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@v7
        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.
  release:
    if: github.ref_type == 'tag'
    needs: [ changes, validate, windows-build, linux-build ]
    runs-on: ubuntu-22.04
    permissions:
      contents: write
    steps:
      - uses: actions/checkout@v7
        with:
          persist-credentials: false

      - uses: actions/download-artifact@v7
        with:
          name: goldeneye-pc-port-win64
          path: dist

      - uses: actions/download-artifact@v7
        with:
          name: goldeneye-pc-port-linux-x86_64
          path: dist

      - 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)
          if gh release view "$TAG" >/dev/null 2>&1; then
            gh release upload "$TAG" "${ASSETS[@]}" --clobber
          else
            gh release create "$TAG" "${ASSETS[@]}" \
              --draft --prerelease \
              --title "GoldenEye 007 PC Port $TAG" \
              --notes-file .github/release-notes.md
          fi