name: Build binaries

on:
  push:
  pull_request:
    branches: [master]
  workflow_dispatch:

permissions:
  contents: read

env:
  CARGO_TERM_COLOR: always
  # Measure before stripping; the packaged copy is stripped below.
  CARGO_PROFILE_RELEASE_STRIP: none

jobs:
  build:
    name: Build (${{ matrix.target }})
    runs-on: ubuntu-latest
    timeout-minutes: 60
    env:
      TARGET: ${{ matrix.target }}
    defaults:
      run:
        shell: bash
    strategy:
      fail-fast: false
      # Supported by Gitea 28; bound concurrent cross-build memory use.
      max-parallel: 2
      matrix:
        target:
          - x86_64-musl
          - i686-musl
          - arm-musleabi
          - arm-musleabihf
          - armv7-musleabi
          - armv7-musleabihf
          - aarch64-musl
          - mips-musl
          - mipsel-musl
          - mips64-muslabi64
          - mips64el-muslabi64
          - riscv64gc-musl
    steps:
      - name: Checkout
        uses: builtin:checkout

      - name: Configure Rust directories
        # Cross remote's symlink traversal skips hidden directories under /root.
        run: |
          echo "CARGO_HOME=$RUNNER_TEMP/cargo" >> "$GITHUB_ENV"
          echo "RUSTUP_HOME=$RUNNER_TEMP/rustup" >> "$GITHUB_ENV"
          echo "$RUNNER_TEMP/cargo/bin" >> "$GITHUB_PATH"

      - name: Install Rust toolchain
        uses: actions-rust-lang/setup-rust-toolchain@ecabd13d1c56bd1345c230e542e9144811ad706f # v2
        with:
          toolchain: ${{ startsWith(matrix.target, 'mips') && 'nightly' || 'stable' }}
          cache: false
          build-warnings: warn

      - name: Install cross and binary tools
        run: |
          sudo apt-get update
          sudo apt-get install -y --no-install-recommends binutils llvm
          cargo install --git https://github.com/cross-rs/cross --locked cross
          echo "RUST_TARGET=${TARGET%-*}-unknown-linux-${TARGET#*-}" >> "$GITHUB_ENV"

      - name: Build release binary
        env:
          # MIPS build-std lacks Rust's bundled CRT objects; use the cross GCC copies.
          RUSTFLAGS: ${{ startsWith(matrix.target, 'mips') && '-C target-feature=+crt-static -C link-self-contained=no' || '-C target-feature=+crt-static' }}
          # Copy toolchains and sources instead of translating nested bind mounts.
          CROSS_REMOTE: "true"
          # Cross's per-artifact JSON capture hides compiler diagnostics.
          CROSS_REMOTE_COPY_FULL_TARGET_DIR: ${{ startsWith(matrix.target, 'mips') && 'true' || 'false' }}
        run: |
          cross build --release --locked --target "$RUST_TARGET"

      - name: Verify, package, and summarize binary
        run: |
          binary="target/${RUST_TARGET}/release/sqm-autorate-rust"
          readelf --program-headers "$binary" > /tmp/program-headers.txt
          readelf --dynamic "$binary" > /tmp/dynamic-section.txt
          if grep -q INTERP /tmp/program-headers.txt || grep -q NEEDED /tmp/dynamic-section.txt; then
            echo "Binary is not statically linked" >&2
            exit 1
          fi
          mkdir -p dist
          stripped="dist/sqm-autorate-rust-${TARGET}"
          artifact="${stripped}.tar.gz"
          cp "$binary" "$stripped"
          llvm-strip --strip-all "$stripped"
          # Tar preserves executable permissions when downloading the artifact.
          tar -czf "$artifact" -C dist "sqm-autorate-rust-${TARGET}"

          size() {
            stat -c %s "$1" | numfmt --to=iec-i --suffix=B --format='%.1f'
          }
          {
            echo '| Target | Unstripped | Stripped | Compressed |'
            echo '|:--|--:|--:|--:|'
            printf '| %s | %s | %s | %s |\n' \
              "$TARGET" "$(size "$binary")" "$(size "$stripped")" "$(size "$artifact")"
          } >> "$GITHUB_STEP_SUMMARY"

      - name: Upload binary
        # Use the v3 artifact protocol supported by Gitea.
        uses: actions/upload-artifact@cf430e030ddbb5b0abf93d22962f4752f3646cd9 # v7.0.2
        with:
          name: sqm-autorate-rust-${{ matrix.target }}
          path: dist/sqm-autorate-rust-${{ matrix.target }}.tar.gz
          if-no-files-found: error