name: Build

on:
  push:
    branches:
      - main
    tags:
      - '[0-9]*.[0-9]*.[0-9]*'
  # Build every PR head commit and publish UF2 artifacts for reviewers.
  pull_request:

concurrency:
  group: build-${{ github.event.pull_request.number || github.ref }}
  cancel-in-progress: true

permissions:
  contents: read

jobs:
  compile:
    runs-on: ubuntu-latest

    steps:
      - name: Check out repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          ref: ${{ github.event.pull_request.head.sha || github.sha }}

      - name: Set up Arduino CLI
        uses: arduino/setup-arduino-cli@v2

      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: '3.x'

      - name: Install adafruit-nrfutil
        # The Adafruit nRF52 build recipe shells out to adafruit-nrfutil to
        # package the DFU .zip; it is not bundled with the core on the runner.
        run: pip install adafruit-nrfutil

      - name: Install Adafruit nRF52 core
        run: |
          arduino-cli config init --overwrite
          arduino-cli config set board_manager.additional_urls https://adafruit.github.io/arduino-board-index/package_adafruit_index.json
          arduino-cli core update-index
          arduino-cli core install adafruit:nrf52

      - name: Resolve build version
        id: build_version
        env:
          PR_NUMBER: ${{ github.event.pull_request.number || '' }}
          HEAD_SHA: ${{ github.event.pull_request.head.sha || github.sha }}
        run: |
          set -eu
          SEMVER_RE='^(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)\.(0|[1-9][0-9]*)$'
          BASE_VERSION="$(
            git tag --list \
              | grep -E "$SEMVER_RE" \
              | sort -V \
              | tail -n1 || true
          )"
          if [ -z "$BASE_VERSION" ]; then
            BASE_VERSION="0.9.1"
          fi
          SHORT_SHA="$(git rev-parse --short=8 "${HEAD_SHA}")"
          PR_NUMBER_OR_ZERO="${PR_NUMBER:-0}"

          if [ "${{ github.event_name }}" = "pull_request" ]; then
            VERSION="${BASE_VERSION}-pr${PR_NUMBER_OR_ZERO}+${SHORT_SHA}"
            ARTIFACT_VERSION="${BASE_VERSION}-pr${PR_NUMBER_OR_ZERO}-${SHORT_SHA}"
          else
            VERSION="${BASE_VERSION}"
            ARTIFACT_VERSION="${BASE_VERSION}-${SHORT_SHA}"
          fi

          echo "base_version=$BASE_VERSION" >> "$GITHUB_OUTPUT"
          echo "pr_number=$PR_NUMBER_OR_ZERO" >> "$GITHUB_OUTPUT"
          echo "short_sha=$SHORT_SHA" >> "$GITHUB_OUTPUT"
          echo "artifact_version=$ARTIFACT_VERSION" >> "$GITHUB_OUTPUT"
          echo "version=$VERSION" >> "$GITHUB_OUTPUT"

      - name: Generate version header
        env:
          OPK_BUILD_VERSION: ${{ steps.build_version.outputs.version }}
        run: ./gen_version.sh

      - name: Compile OpenPuck
        run: |
          mkdir -p build/openpuck build/cache/openpuck
          arduino-cli compile \
            -b adafruit:nrf52:feather52840 \
            --clean \
            --build-path build/cache/openpuck \
            --output-dir build/openpuck \
            --build-property "build.extra_flags=-DNRF52840_XXAA {build.flags.usb} -DCFG_TUD_HID=4 -DCFG_TUD_TASK_QUEUE_SZ=64 -DCFG_TUD_VENDOR_TX_BUFSIZE=256" \
            OpenPuck

      - name: Generate UF2 (OpenPuck)
        # The Adafruit nRF52 core leaves its UF2 objcopy recipe commented out in
        # platform.txt, so arduino-cli only emits .hex/.zip. Convert the .hex to
        # a drag-and-drop .uf2 ourselves.
        run: ./gen_uf2.sh build/openpuck/OpenPuck.ino.hex build/openpuck/OpenPuck.ino.uf2

      - name: Compile ReversePuckFirmware
        run: |
          mkdir -p build/reversepuck build/cache/reversepuck
          arduino-cli compile \
            -b adafruit:nrf52:feather52840 \
            --clean \
            --build-path build/cache/reversepuck \
            --output-dir build/reversepuck \
            --build-property "build.extra_flags=-DNRF52840_XXAA {build.flags.usb}" \
            ReversePuckFirmware

      - name: Generate UF2 (ReversePuckFirmware)
        run: ./gen_uf2.sh build/reversepuck/ReversePuckFirmware.ino.hex build/reversepuck/ReversePuckFirmware.ino.uf2

      - name: List build outputs
        run: |
          find build/openpuck build/reversepuck -maxdepth 1 -type f -print | sort

      - name: Upload OpenPuck UF2 artifact
        uses: actions/upload-artifact@v4
        with:
          name: OpenPuck-${{ steps.build_version.outputs.artifact_version }}-standard.uf2
          retention-days: 7
          if-no-files-found: error
          path: build/openpuck/OpenPuck.ino.uf2

      - name: Upload OpenPuck HEX artifact
        uses: actions/upload-artifact@v4
        with:
          name: OpenPuck-${{ steps.build_version.outputs.artifact_version }}-standard.hex
          retention-days: 7
          if-no-files-found: error
          path: build/openpuck/OpenPuck.ino.hex

      - name: Upload ReversePuckFirmware UF2 artifact
        uses: actions/upload-artifact@v4
        with:
          name: ReversePuckFirmware-${{ steps.build_version.outputs.artifact_version }}.uf2
          retention-days: 7
          if-no-files-found: error
          path: build/reversepuck/ReversePuckFirmware.ino.uf2

      - name: Upload ReversePuckFirmware HEX artifact
        uses: actions/upload-artifact@v4
        with:
          name: ReversePuckFirmware-${{ steps.build_version.outputs.artifact_version }}.hex
          retention-days: 7
          if-no-files-found: error
          path: build/reversepuck/ReversePuckFirmware.ino.hex