name: Compile StarPilot

on:
  workflow_dispatch:
    inputs:
      target_ref:
        description: "Branch to build and publish back to"
        type: string
        default: "master"
        required: true
      jobs:
        description: "Optional parallel job count passed to ./build"
        type: string
        default: "12"
        required: false

concurrency:
  group: compile-starpilot-${{ inputs.target_ref }}
  cancel-in-progress: false

permissions:
  contents: write

env:
  GIT_EMAIL: "168790843+firestar5683@users.noreply.github.com"
  GIT_NAME: "StarPilot Build Bot"
  TARGET_REF: ${{ inputs.target_ref }}

jobs:
  build_and_push:
    runs-on: [self-hosted, truenas, starpilot-build]
    timeout-minutes: 720
    steps:
      - name: Validate target branch
        shell: bash
        run: |
          set -euo pipefail

          if [[ -z "${TARGET_REF}" ]]; then
            echo "target_ref is required." >&2
            exit 1
          fi

          if [[ "${TARGET_REF}" == refs/heads/* ]]; then
            echo "BUILD_BRANCH=${TARGET_REF#refs/heads/}" >> "$GITHUB_ENV"
          else
            echo "BUILD_BRANCH=${TARGET_REF}" >> "$GITHUB_ENV"
          fi

      - name: Checkout target branch
        uses: actions/checkout@v4
        with:
          ref: ${{ env.BUILD_BRANCH }}
          fetch-depth: 0
          submodules: recursive

      - name: Configure git identity
        shell: bash
        run: |
          set -euo pipefail
          git config user.name "$GIT_NAME"
          git config user.email "$GIT_EMAIL"
          git config http.postBuffer 104857600

      - name: Ensure branch exists on origin
        shell: bash
        run: |
          set -euo pipefail
          git ls-remote --exit-code --heads origin "refs/heads/${BUILD_BRANCH}" >/dev/null

      - name: Link persistent sysroot
        shell: bash
        run: |
          set -euo pipefail
          ls -ld /runner /runner/sysroots /runner/sysroots/default || true
          ls -ld /runner/sysroots/default/usr /runner/sysroots/default/usr/local /runner/sysroots/default/usr/local/lib || true
          rm -rf .comma_sysroot
          ln -s /runner/sysroots/default .comma_sysroot
          ls -ld .comma_sysroot .comma_sysroot/usr .comma_sysroot/usr/local .comma_sysroot/usr/local/lib

      - name: Run StarPilot device build
        shell: bash
        run: |
          set -euo pipefail

          export COMMA_HOST_ROOT_DIR="/mnt/Apparition/My_App_Data/starpilot-runner/_work/${GITHUB_REPOSITORY#*/}/${GITHUB_REPOSITORY#*/}"
          export COMMA_HOST_SYSROOT_DIR="/mnt/Apparition/My_App_Data/starpilot-runner/sysroots/default"
          export COMMA_HOST_CACHE_DIR="/mnt/Apparition/My_App_Data/starpilot-runner/cache/work"
          export COMMA_HOST_VENV_DIR="/mnt/Apparition/My_App_Data/starpilot-runner/cache/venv-linux-arm64"
          export COMMA_SYSROOT_DIR="/runner/sysroots/default"

          if [[ -n "${{ inputs.jobs }}" ]]; then
            ./build "${{ inputs.jobs }}"
          else
            ./build
          fi

      - name: Commit build output
        shell: bash
        run: |
          set -euo pipefail

          if [[ -z "$(git status --porcelain --untracked-files=no)" ]]; then
            echo "No build output changes detected."
            exit 0
          fi

          git add -u
          git commit -m "build"

      - name: Push build commit
        shell: bash
        run: |
          set -euo pipefail
          git push origin "HEAD:refs/heads/${BUILD_BRANCH}"