name: os

on:
  schedule:
    - cron: '0 5 8,18,28 * *'
  push:
    paths:
      - 'Dockerfile'
      - 'etc/**'
      - 'usr/**'
      - 'repo/**'
      - '.github/workflows/os.yml'
  workflow_dispatch:

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}

jobs:
  build:
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
      id-token: write

    steps:
      - name: Maximize build space
        uses: easimon/maximize-build-space@master
        with:
          root-reserve-mb: 512
          swap-size-mb: 1024
          remove-dotnet: 'true'
          remove-android: 'true'
          remove-haskell: 'true'
          remove-codeql: 'true'
          remove-docker-images: 'true'

      - name: Get current date
        id: date
        run: echo "date=$(date +'%Y%m%d')" >> $GITHUB_OUTPUT

      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
          tags: |
            type=ref,event=branch
            type=raw,value=latest,enable={{is_default_branch}}
            type=raw,value=10
            type=raw,value=10.${{ steps.date.outputs.date }}

      - name: Log into GHCR
        if: github.event_name != 'pull_request'
        run: |
          buildah login -u ${{ github.actor }} -p ${{ secrets.GITHUB_TOKEN }} ${{ env.REGISTRY }}

      - name: Build image with Buildah
        id: build-image
        run: |
          # Vi bygger med et fast navn 'raw-img' lokalt
          buildah bud \
            --label "org.opencontainers.image.source=https://github.com/${{ github.repository }}" \
            -t raw-img .

          # Vi gemmer det første rigtige tag til senere brug (fx signering)
          PRIMARY_TAG=$(echo "${{ steps.meta.outputs.tags }}" | head -n 1)
          echo "primary_tag=$PRIMARY_TAG" >> $GITHUB_OUTPUT

      - name: Push to GHCR
        if: github.event_name != 'pull_request'
        run: |
          # Loop igennem alle de tags, som metadata-action genererede
          for tag in $(echo "${{ steps.meta.outputs.tags }}"); do
            echo "Tagging and pushing: $tag"
            # VI TILFØJER DETTE TRIN: Giv raw-img det rigtige navn før push
            buildah tag raw-img "$tag"
            buildah push "$tag"
          done

      - name: Install cosign
        if: github.event_name != 'pull_request'
        uses: sigstore/cosign-installer@v3.3.0

      - name: Sign image
        if: github.event_name != 'pull_request'
        run: |
          # Vi skal bruge buildah tag igen her for at sikre at PRIMARY_TAG findes lokalt
          buildah tag raw-img "${{ steps.build-image.outputs.primary_tag }}"
          cosign sign --yes "${{ steps.build-image.outputs.primary_tag }}"