name: Build and Push .NET Images

on:
  release:
    types: [published, prereleased]
  workflow_dispatch:
  schedule:
    # Weekly rebuild for CVE patches (Sunday 6am UTC)
    - cron: "0 6 * * 0"

permissions:
  id-token: write
  contents: read
  packages: write

env:
  DOCKER_IMAGE: docker.io/svrnty/dotnet
  RELEASES_INDEX_URL: https://dotnetcli.azureedge.net/dotnet/release-metadata/releases-index.json

jobs:
  build:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3
        with:
          platforms: arm64

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Log in to DockerHub
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.REGISTRY_USERNAME }}
          password: ${{ secrets.REGISTRY_PASSWORD }}

      - name: Install apko
        run: |
          curl -fsSL https://github.com/chainguard-dev/apko/releases/latest/download/apko_$(curl -fsSL https://api.github.com/repos/chainguard-dev/apko/releases/latest | jq -r .tag_name | sed 's/^v//')_linux_amd64.tar.gz \
            | tar xz --strip-components=1 -C /usr/local/bin

      - name: Install Docker Scout
        run: |
          curl -fsSL https://raw.githubusercontent.com/docker/scout-cli/main/install.sh -o install-scout.sh
          sh install-scout.sh

      - name: Determine tag suffix
        id: suffix
        run: |
          if [[ "${{ github.event.release.prerelease }}" == "true" ]]; then
            echo "TAG_SUFFIX=-test" >> $GITHUB_ENV
            echo "Prerelease detected — tags will use -test suffix"
          else
            echo "TAG_SUFFIX=" >> $GITHUB_ENV
          fi

      - name: Discover versions and build all images
        run: |
          set -euo pipefail

          # Discover supported .NET versions
          RELEASES=$(curl -fsSL "$RELEASES_INDEX_URL")
          SUPPORTED=$(echo "$RELEASES" | jq -c '[.["releases-index"][] | select(.["support-phase"] == "active" or .["support-phase"] == "go-live")]')

          LTS_MAJOR=$(echo "$SUPPORTED" | jq -r '[.[] | select(.["release-type"] == "lts")] | sort_by(.["channel-version"] | split(".") | map(tonumber)) | last | .["channel-version"] | split(".")[0]')
          STS_MAJOR=$(echo "$SUPPORTED" | jq -r '[.[] | select(.["release-type"] == "sts")] | sort_by(.["channel-version"] | split(".") | map(tonumber)) | last | .["channel-version"] | split(".")[0] // ""')

          echo "LTS major: $LTS_MAJOR"
          echo "STS major: $STS_MAJOR"

          # Build apko base images (shared across all .NET versions)
          for VARIANT in runtime runtime-invariant sdk; do
            for ARCH in x86_64 aarch64; do
              echo "::group::Building apko base: $VARIANT ($ARCH)"
              mkdir -p build-${ARCH}/${VARIANT}
              apko build --arch $ARCH \
                apko/${VARIANT}.yaml ${VARIANT}:latest build-${ARCH}/${VARIANT}/rootfs.tar.gz
              echo "::endgroup::"
            done
          done

          # Iterate over each supported .NET version
          echo "$SUPPORTED" | jq -r '.[] | "\(.["channel-version"] | split(".")[0]) \(.["latest-runtime"]) \(.["latest-sdk"]) \(.["release-type"])"' | \
          while read -r MAJOR RUNTIME SDK TYPE; do
            echo "============================================="
            echo "Building .NET $MAJOR: runtime=$RUNTIME sdk=$SDK type=$TYPE"
            echo "============================================="

            # Download .NET binaries
            for ARCH in x86_64 aarch64; do
              if [ "$ARCH" = "x86_64" ]; then
                DOTNET_ARCH="x64"
                PLATFORM_ARCH="amd64"
              else
                DOTNET_ARCH="arm64"
                PLATFORM_ARCH="arm64"
              fi

              echo "::group::Downloading ASP.NET Core runtime $RUNTIME ($DOTNET_ARCH)"
              mkdir -p dotnet-${PLATFORM_ARCH}/runtime
              curl -fsSL "https://dotnetcli.azureedge.net/dotnet/aspnetcore/Runtime/${RUNTIME}/aspnetcore-runtime-${RUNTIME}-linux-${DOTNET_ARCH}.tar.gz" \
                -o /tmp/aspnet-runtime-${PLATFORM_ARCH}.tar.gz
              tar xf /tmp/aspnet-runtime-${PLATFORM_ARCH}.tar.gz -C dotnet-${PLATFORM_ARCH}/runtime
              echo "::endgroup::"

              echo "::group::Downloading .NET SDK $SDK ($DOTNET_ARCH)"
              mkdir -p dotnet-${PLATFORM_ARCH}/sdk
              curl -fsSL "https://dotnetcli.azureedge.net/dotnet/Sdk/${SDK}/dotnet-sdk-${SDK}-linux-${DOTNET_ARCH}.tar.gz" \
                -o /tmp/dotnet-sdk-${PLATFORM_ARCH}.tar.gz
              tar xf /tmp/dotnet-sdk-${PLATFORM_ARCH}.tar.gz -C dotnet-${PLATFORM_ARCH}/sdk
              echo "::endgroup::"
            done

            # Build and push each variant
            for VARIANT in runtime runtime-invariant sdk; do
              if [ "$VARIANT" = "sdk" ]; then
                VERSION="$SDK"
                DOTNET_DIR="sdk"
              else
                VERSION="$RUNTIME"
                DOTNET_DIR="runtime"
              fi

              echo "::group::Building $VARIANT-$MAJOR"

              # Prepare build context
              CONTEXT="context-${VARIANT}-${MAJOR}"
              rm -rf "$CONTEXT"
              mkdir -p "$CONTEXT"
              for ARCH in amd64 arm64; do
                APKO_ARCH=$([[ "$ARCH" == "amd64" ]] && echo "x86_64" || echo "aarch64")
                mkdir -p "$CONTEXT/build-${ARCH}/${VARIANT}"
                cp "build-${APKO_ARCH}/${VARIANT}/rootfs.tar.gz" "$CONTEXT/build-${ARCH}/${VARIANT}/"
                mkdir -p "$CONTEXT/dotnet-${ARCH}"
                cp -r "dotnet-${ARCH}/${DOTNET_DIR}" "$CONTEXT/dotnet-${ARCH}/"
              done
              cp "dockerfiles/${VARIANT}.Dockerfile" "$CONTEXT/Dockerfile"

              # Determine tags
              TAGS="-t $DOCKER_IMAGE:${VARIANT}-${MAJOR}${TAG_SUFFIX} -t $DOCKER_IMAGE:${VARIANT}-${VERSION}${TAG_SUFFIX}"
              if [ "$MAJOR" = "$LTS_MAJOR" ]; then
                TAGS="$TAGS -t $DOCKER_IMAGE:${VARIANT}-lts${TAG_SUFFIX}"
              fi
              if [ "$MAJOR" = "$STS_MAJOR" ]; then
                TAGS="$TAGS -t $DOCKER_IMAGE:${VARIANT}-sts${TAG_SUFFIX}"
              fi

              echo "Building $VARIANT with tags: $TAGS"
              docker buildx build --platform linux/amd64,linux/arm64 --push \
                --sbom=true --provenance=mode=max \
                $TAGS \
                "$CONTEXT/"

              echo "::endgroup::"
            done

            # Docker Scout CVE scan
            for VARIANT in runtime runtime-invariant sdk; do
              echo "::group::Scout scan: ${VARIANT}-${MAJOR}"
              docker scout cves "$DOCKER_IMAGE:${VARIANT}-${MAJOR}${TAG_SUFFIX}" --only-severity critical,high || true
              echo "::endgroup::"
            done

            # Clean up .NET binaries for this version before next iteration
            rm -rf dotnet-amd64 dotnet-arm64
          done