name: Release build & publish

on:
  release:
    types: [created]
  workflow_dispatch:
    inputs:
      tag:
        description: "Existing release tag to (re)build and publish (e.g. v0.5.0)"
        required: true
        type: string

permissions:
  contents: write

env:
  BIN_NAME: nyx
  RELEASE_TAG: ${{ github.event.release.tag_name || inputs.tag }}

jobs:
  frontend:
    name: build-frontend
    runs-on: ubuntu-latest
    steps:
      - name: Check out sources
        uses: actions/checkout@v6
        with:
          ref: ${{ env.RELEASE_TAG }}

      - uses: actions/setup-node@v6
        with:
          node-version: 20
          cache: npm
          cache-dependency-path: frontend/package-lock.json

      - name: Install frontend dependencies
        working-directory: frontend
        run: npm ci

      - name: Build frontend
        working-directory: frontend
        run: npm run build

      - name: Upload frontend dist
        uses: actions/upload-artifact@v7
        with:
          name: frontend-dist
          path: src/server/assets/dist/
          if-no-files-found: error
          retention-days: 1

  build:
    needs: frontend
    strategy:
      matrix:
        include:
          - target: x86_64-unknown-linux-gnu
            os: ubuntu-latest
          - target: aarch64-unknown-linux-gnu
            os: ubuntu-latest
          - target: x86_64-pc-windows-msvc
            os: windows-latest
          - target: x86_64-apple-darwin
            os: macos-14
          - target: aarch64-apple-darwin
            os: macos-14
    runs-on: ${{ matrix.os }}

    steps:
      - name: Check out sources
        uses: actions/checkout@v6
        with:
          ref: ${{ env.RELEASE_TAG }}

      - name: Download prebuilt frontend dist
        uses: actions/download-artifact@v8
        with:
          name: frontend-dist
          path: src/server/assets/dist/

      - name: Install Rust toolchain
        uses: actions-rust-lang/setup-rust-toolchain@v1
        with:
          toolchain: stable
          target: ${{ matrix.target }}
          cache: true

      - name: Install cross-compilation tools (ARM Linux)
        if: matrix.target == 'aarch64-unknown-linux-gnu'
        run: |
          sudo apt-get update
          sudo apt-get install -y gcc-aarch64-linux-gnu
          echo '[target.aarch64-unknown-linux-gnu]' >> ~/.cargo/config.toml
          echo 'linker = "aarch64-linux-gnu-gcc"' >> ~/.cargo/config.toml

      - name: Install target
        run: rustup target add ${{ matrix.target }}

      - name: Build
        run: cargo build --release --bin ${{ env.BIN_NAME }} --target ${{ matrix.target }}

      - name: Package (Linux & macOS)
        if: runner.os != 'Windows'
        shell: bash
        run: |
          set -euo pipefail
          BIN=${{ env.BIN_NAME }}
          TARGET=${{ matrix.target }}
          EXT=$([[ "$TARGET" == *windows* ]] && echo ".exe" || echo "")
          BIN_PATH=target/$TARGET/release/$BIN$EXT
          mkdir -p dist
          ARCHIVE=$BIN-$TARGET.zip
          files=("$BIN_PATH" THIRDPARTY-LICENSES.html)
          shopt -s nullglob
          license_files=(LICENSE* COPYING*)
          shopt -u nullglob
          files+=("${license_files[@]}")
          zip -9 "dist/$ARCHIVE" "${files[@]}"
          echo "ASSET=$ARCHIVE" >> "$GITHUB_ENV"

      - name: Package (Windows)
        if: runner.os == 'Windows'
        shell: pwsh
        run: |
          $Bin      = '${{ env.BIN_NAME }}'
          $Target   = '${{ matrix.target }}'
          $Ext      = '.exe'
          $BinPath  = "target/$Target/release/$Bin$Ext"
          New-Item -ItemType Directory -Path dist -Force | Out-Null
          $Archive  = "$Bin-$Target.zip"
          $LicenseFiles = @(Get-ChildItem -Path 'LICENSE*', 'COPYING*' -File -ErrorAction SilentlyContinue | ForEach-Object { $_.FullName })
          $Files = @($BinPath, 'THIRDPARTY-LICENSES.html') + $LicenseFiles

          Compress-Archive `
              -Path $Files `
              -DestinationPath "dist/$Archive" `
              -CompressionLevel Optimal

          Add-Content -Path $env:GITHUB_ENV -Value "ASSET=$Archive"

      - name: Upload build artifact
        uses: actions/upload-artifact@v7
        with:
          name: release-${{ matrix.target }}
          path: dist/${{ env.ASSET }}
          if-no-files-found: error
          retention-days: 1

  reproducibility:
    name: reproducibility-check
    needs: frontend
    runs-on: ubuntu-latest
    continue-on-error: true
    steps:
      - name: Check out sources
        uses: actions/checkout@v6
        with:
          ref: ${{ env.RELEASE_TAG }}

      - name: Download prebuilt frontend dist
        uses: actions/download-artifact@v8
        with:
          name: frontend-dist
          path: src/server/assets/dist/

      - name: Install Rust toolchain
        uses: actions-rust-lang/setup-rust-toolchain@v1
        with:
          toolchain: stable
          target: x86_64-unknown-linux-gnu
          cache: true

      - name: Build twice and diff hashes
        shell: bash
        env:
          RUSTFLAGS: "--remap-path-prefix=${{ github.workspace }}=/build"
        run: |
          set -euo pipefail
          TARGET=x86_64-unknown-linux-gnu
          BIN=${{ env.BIN_NAME }}
          BIN_PATH="target/$TARGET/release/$BIN"

          SOURCE_DATE_EPOCH=$(git log -1 --format=%ct HEAD)
          export SOURCE_DATE_EPOCH
          echo "SOURCE_DATE_EPOCH=$SOURCE_DATE_EPOCH"

          cargo build --release --bin "$BIN" --target "$TARGET"
          HASH1=$(sha256sum "$BIN_PATH" | awk '{print $1}')
          echo "first build:  $HASH1"

          cargo clean --release --target "$TARGET"
          cargo build --release --bin "$BIN" --target "$TARGET"
          HASH2=$(sha256sum "$BIN_PATH" | awk '{print $1}')
          echo "second build: $HASH2"

          if [ "$HASH1" != "$HASH2" ]; then
            echo "::error::Reproducibility check failed: builds are not bit-identical"
            echo "  first:  $HASH1"
            echo "  second: $HASH2"
            exit 1
          fi
          echo "::notice::Reproducible build verified (sha256=$HASH1)"

  publish:
    name: publish-release
    runs-on: ubuntu-latest
    needs: [build]
    permissions:
      contents: write
      id-token: write
      attestations: write
    steps:
      - name: Check out sources
        uses: actions/checkout@v6
        with:
          ref: ${{ env.RELEASE_TAG }}

      - name: Generate CycloneDX SBOM
        uses: anchore/sbom-action@v0
        with:
          path: .
          format: cyclonedx-json
          output-file: nyx-${{ env.RELEASE_TAG }}.cdx.json
          upload-artifact: false
          upload-release-assets: false

      - name: Download all build artifacts
        uses: actions/download-artifact@v8
        with:
          path: release-artifacts
          pattern: release-*
          merge-multiple: true

      - name: Generate SHA256SUMS
        run: |
          set -euo pipefail
          cd release-artifacts
          ls -lh
          sha256sum *.zip > SHA256SUMS
          cat SHA256SUMS

      # Sigstore keyless signing. Verify with:
      #   cosign verify-blob --bundle <file>.bundle \
      #     --certificate-identity-regexp 'https://github.com/elicpeter/nyx/.*' \
      #     --certificate-oidc-issuer https://token.actions.githubusercontent.com \
      #     <file>
      - name: Install cosign
        uses: sigstore/cosign-installer@v4.1.2

      - name: Cosign keyless sign release artifacts
        shell: bash
        run: |
          set -euo pipefail
          SBOM="nyx-${{ env.RELEASE_TAG }}.cdx.json"
          (
            cd release-artifacts
            for f in *.zip SHA256SUMS; do
              cosign sign-blob --yes \
                --bundle "$f.bundle" \
                "$f"
            done
          )
          cosign sign-blob --yes \
            --bundle "$SBOM.bundle" \
            "$SBOM"

      # SLSA v1 provenance. Verify with `gh attestation verify <file> --repo <repo>`.
      - name: Generate SLSA build provenance
        uses: actions/attest-build-provenance@v4
        with:
          subject-path: |
            release-artifacts/*.zip
            release-artifacts/SHA256SUMS
            nyx-${{ env.RELEASE_TAG }}.cdx.json

      - name: Upload to the release
        uses: softprops/action-gh-release@v3
        with:
          tag_name: ${{ env.RELEASE_TAG }}
          files: |
            release-artifacts/*.zip
            release-artifacts/*.zip.bundle
            release-artifacts/SHA256SUMS
            release-artifacts/SHA256SUMS.bundle
            nyx-${{ env.RELEASE_TAG }}.cdx.json
            nyx-${{ env.RELEASE_TAG }}.cdx.json.bundle
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}