name: Publish godot-ci image

on:
  schedule:
    # Midnight daily. Picks up new Godot stable releases (and, incidentally, new
    # Blender stables whenever it rebuilds — see resolve step below).
    - cron: '0 0 * * *'
  workflow_dispatch:
    inputs:
      godot_version:
        description: >-
          Godot version to (re)build, e.g. 4.7.1 — must exist as a stable release at
          https://github.com/godotengine/godot-builds/releases. Leave empty to build
          the newest stable, same as the nightly run.
        required: false
        type: string

jobs:
  publish:
    runs-on: ubuntu-latest
    env:
      IMAGE: git.arthurerlich.de/haylan/godot-ci
      DOCKER_CLI_EXPERIMENTAL: enabled
    steps:
      - uses: actions/checkout@v4

      - name: Log in to Gitea registry
        run: echo "${{ secrets.REGISTRY_PUSH_PAT }}" | docker login git.arthurerlich.de -u haylan --password-stdin

      - name: Resolve target Godot version
        id: resolve
        run: |
          set -euo pipefail

          if [ -n "${{ inputs.godot_version }}" ]; then
            VERSION="${{ inputs.godot_version }}"
            UPDATE_LATEST=false
          else
            VERSION="$(./scripts/resolve-godot-version.sh)"
            UPDATE_LATEST=true
          fi

          # This image no longer depends on barichello/godot-ci as a base — it downloads Godot
          # directly from godot-builds' own GitHub releases (see Dockerfile), so the gate here
          # is against *that* release existing, not a third party's Docker tag.
          RELEASE_URL="https://github.com/godotengine/godot-builds/releases/download/${VERSION}-stable/Godot_v${VERSION}-stable_linux.x86_64.zip"
          if ! curl -fsSL -o /dev/null -r 0-0 "$RELEASE_URL"; then
            if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
              echo "::error::No godot-builds stable release for '${VERSION}'. Check https://github.com/godotengine/godot-builds/releases"
              exit 1
            fi
            echo "::notice::Newest Godot stable is ${VERSION} but its godot-builds release isn't up yet — skipping, will retry tomorrow."
            echo "skip=true" >> "$GITHUB_OUTPUT"
            exit 0
          fi

          if [ "$UPDATE_LATEST" = true ] && docker manifest inspect "${IMAGE}:${VERSION}" >/dev/null 2>&1; then
            echo "::notice::${VERSION} is already published and nothing changed — skipping."
            echo "skip=true" >> "$GITHUB_OUTPUT"
            exit 0
          fi

          echo "version=${VERSION}" >> "$GITHUB_OUTPUT"
          echo "update_latest=${UPDATE_LATEST}" >> "$GITHUB_OUTPUT"
          echo "skip=false" >> "$GITHUB_OUTPUT"

      - name: Resolve newest Blender
        if: steps.resolve.outputs.skip != 'true'
        id: blender
        run: echo "url=$(./scripts/resolve-blender-url.sh)" >> "$GITHUB_OUTPUT"

      # Now that this workflow tracks the newest Godot/Blender instead of one
      # pinned version, most nightly runs build genuinely new multi-GB layers
      # instead of hitting cache — nothing here ever pruned old ones, so the
      # runner's disk fills up over successive runs until a push (a blob
      # write) is what finally fails. Clear stale images/build cache first.
      - name: Free up runner disk
        if: steps.resolve.outputs.skip != 'true'
        run: docker system prune -af --volumes

      - name: Build and push
        if: steps.resolve.outputs.skip != 'true'
        run: |
          set -euo pipefail
          VERSION="${{ steps.resolve.outputs.version }}"
          docker build \
            --build-arg GODOT_VERSION="$VERSION" \
            --build-arg BLENDER_URL="${{ steps.blender.outputs.url }}" \
            -t "${IMAGE}:${VERSION}" .

          # Registry blob PUTs have been failing with transient 500s
          # (unrelated to build correctness) — retry a few times before
          # giving up.
          push_with_retry() {
            for attempt in 1 2 3; do
              if docker push "$1"; then
                return 0
              fi
              echo "::warning::docker push $1 failed (attempt $attempt/3), retrying..."
              sleep $((attempt * 10))
            done
            return 1
          }

          push_with_retry "${IMAGE}:${VERSION}"

          if [ "${{ steps.resolve.outputs.update_latest }}" = "true" ]; then
            docker tag "${IMAGE}:${VERSION}" "${IMAGE}:latest"
            push_with_retry "${IMAGE}:latest"
          fi

      # Gitea packages belong to the owner, not a repo, by default — pushing
      # the image alone does NOT make it show up under this repo's Packages
      # tab. Link it explicitly. Non-fatal: a failure here (e.g. already
      # linked) shouldn't fail a build whose push already succeeded.
      - name: Link package to this repository
        if: steps.resolve.outputs.skip != 'true'
        run: |
          curl -sS -X POST \
            -H "Authorization: token ${{ secrets.REGISTRY_PUSH_PAT }}" \
            "https://git.arthurerlich.de/api/v1/packages/haylan/container/godot-ci/-/link/godot-ci" \
            || echo "link step failed (may already be linked) — check manually if needed"