on:
  workflow_dispatch:

env:
  NIX_CONFIG: |
    extra-substituters = https://attic.radiantwavetech.com/radiantwave https://nixos-raspberrypi.cachix.org
    extra-trusted-public-keys = radiantwave:QADrjpBWJssTZ3KmiZtcWEf4uAm66oOlHmtQI3jkrgA= nixos-raspberrypi.cachix.org-1:4iMO9LXa8BqhU+Rpg6LQKiGa2lsNh/j2oiYLNOQ5sPI=

jobs:
  build-rpi:
    runs-on: orion-lxc

    steps:
      - name: Checkout
        run: git clone --depth 1 ssh://git@gitea.radiantwavetech.com:2222/RadiantWaveTech/KioskConfig.git .

      - name: Guard main branch is on the production channel
        run: |
          . /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
          NAME=$(nix eval --impure --raw .#channelName)
          if [ "$NAME" != "radiantwave" ]; then
            echo "ERROR: main branch resolves to the '$NAME' channel, expected 'radiantwave'."
            echo "       A dev->main merge brought a dev-pointing channel block into flake.nix."
            echo "       Set channel.appInput/atticRepo/gitRef back to main values before building prod images."
            exit 1
          fi

      # Fail fast unless the closure baked into the image is exactly what
      # RadiantWave CI published to Attic (aarch64). Otherwise the Pi compiles
      # RadiantWave from source (slow) unless RadiantWave CI has published both
      # the aarch64 closure and aarch64-manifest.json. See `channel` in flake.nix.
      - name: Verify baked baseline matches the published channel
        run: |
          set -euo pipefail
          . /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh

          VERSION=$(nix eval --impure --raw .#channelVersion)
          ATTIC=$(nix eval --impure --raw .#channelAtticUrl)
          MANIFEST_URL="$(nix eval --impure --raw .#channelManifestDir)/aarch64-manifest.json"
          BASELINE=$(nix eval --impure --raw .#baselineOutPaths.aarch64-linux)

          MANIFEST=$(curl -fsSL "$MANIFEST_URL")
          PUB_VERSION=$(MANIFEST="$MANIFEST" nix eval --impure --raw --expr '(builtins.fromJSON (builtins.getEnv "MANIFEST")).version')
          PUB_PATH=$(MANIFEST="$MANIFEST" nix eval --impure --raw --expr '(builtins.fromJSON (builtins.getEnv "MANIFEST")).storePath')

          echo "channel version : $VERSION"
          echo "manifest version: $PUB_VERSION"
          echo "baseline path   : $BASELINE"
          echo "manifest path   : $PUB_PATH"

          if [ "$VERSION" != "$PUB_VERSION" ]; then
            echo "ERROR: channel.appVersion '$VERSION' != published manifest version '$PUB_VERSION'."
            echo "       Bump channel.appVersion (and the pinned radiantwave input) to match the release."
            exit 1
          fi

          if [ "$BASELINE" != "$PUB_PATH" ]; then
            echo "ERROR: baseline '$BASELINE' is not the published closure '$PUB_PATH'."
            echo "       Run 'nix flake update radiantwave' so the pinned input resolves to the release the manifest was built from."
            exit 1
          fi

          HASH=$(basename "$BASELINE" | cut -d- -f1)
          if ! curl -fsS -o /dev/null "$ATTIC/${HASH}.narinfo"; then
            echo "ERROR: $BASELINE is not in $ATTIC; the image would compile RadiantWave from source."
            exit 1
          fi

      - name: Prepare output directory
        run: mkdir -p /var/lib/gitea-runner/radiantwave

      - name: Build Raspberry Pi image
        run: |
          export NIXPKGS_ALLOW_UNFREE=1
          . /nix/var/nix/profiles/default/etc/profile.d/nix-daemon.sh
          nix build -L --impure .#nixosConfigurations.radiantwavekiosk-rpi.config.system.build.sdImage

      - name: Rename Raspberry Pi image
        run: |
          ISO_DATE=$(date +%Y-%m-%d_%H-%M-%S)
          FILENAME="radiantwave-rpi-${ISO_DATE}.img.zst"
          cp -L result/sd-image/*.img.zst "/var/lib/gitea-runner/radiantwave/${FILENAME}"
          echo "RPI_IMAGE_FILENAME=${FILENAME}" >> "$GITHUB_ENV"

      - name: Copy Raspberry Pi image to fileserver
        run: |
          scp "/var/lib/gitea-runner/radiantwave/${RPI_IMAGE_FILENAME}" \
            157.245.124.103:/mnt/infrastructure_data/files/images/

      - name: Cleanup Raspberry Pi image
        run: rm -f "/var/lib/gitea-runner/radiantwave/${RPI_IMAGE_FILENAME}"