name: Release image

on:
  release:
    types: [published]
  workflow_dispatch:

permissions:
  contents: read
  packages: write

concurrency:
  group: release-image
  cancel-in-progress: false

jobs:
  image:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: docker/setup-qemu-action@v3

      - uses: docker/setup-buildx-action@v3

      - name: Log in to GHCR
        uses: docker/login-action@v3
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Log in to Gitea
        uses: docker/login-action@v3
        with:
          registry: git.tben.me
          username: ${{ secrets.GITEA_USERNAME }}
          password: ${{ secrets.GITEA_TOKEN }}

      # The version the app reports on Settings > General when the build
      # isn't a published release.
      - name: Read the source version
        id: source
        run: |
          set -euo pipefail
          echo "version=$(sed -n -E 's/^[[:space:]]*"version": "([^"]+)",?$/\1/p' package.json | head -n1)" >> "$GITHUB_OUTPUT"

      - name: Work out image tags
        id: tags
        env:
          EVENT: ${{ github.event_name }}
          RELEASE_TAG: ${{ github.event.release.tag_name }}
          SOURCE_VERSION: ${{ steps.source.outputs.version }}
        run: |
          set -euo pipefail
          sha="sha-${GITHUB_SHA::12}"
          if [ "$EVENT" = "release" ] && [ -n "$RELEASE_TAG" ]; then
            version="$RELEASE_TAG"
            minor="$(printf '%s' "$version" | sed -E 's/^v?([0-9]+)\.([0-9]+).*/\1.\2/')"
            ghcr="$(printf '%s\n' \
              "ghcr.io/moduletrace/cobble:latest" \
              "ghcr.io/moduletrace/cobble:${version}" \
              "ghcr.io/moduletrace/cobble:${minor}" \
              "ghcr.io/moduletrace/cobble:${sha}")"
            gitea="$(printf '%s\n' \
              "git.tben.me/moduletrace/cobble:latest" \
              "git.tben.me/moduletrace/cobble:${version}" \
              "git.tben.me/moduletrace/cobble:${minor}" \
              "git.tben.me/moduletrace/cobble:${sha}")"
          else
            version="$SOURCE_VERSION"
            ghcr="ghcr.io/moduletrace/cobble:${sha}"
            gitea="git.tben.me/moduletrace/cobble:${sha}"
          fi
          {
            echo "version=$version"
            echo "ghcr<<EOF"
            echo "$ghcr"
            echo "EOF"
            echo "gitea<<EOF"
            echo "$gitea"
            echo "EOF"
          } >> "$GITHUB_OUTPUT"

      # The registry the installer defaults to, so this one must succeed.
      - name: Build and push to GHCR
        uses: docker/build-push-action@v6
        with:
          context: .
          file: ./Dockerfile
          platforms: linux/amd64,linux/arm64
          push: true
          build-args: |
            COBBLE_VERSION=${{ steps.tags.outputs.version }}
          tags: ${{ steps.tags.outputs.ghcr }}
          provenance: false
          sbom: false
          cache-from: type=gha
          cache-to: type=gha,mode=max

      # The mirror's registry, from the image just built: no second build,
      # and Cloudflare rate limiting git.tben.me (429/1015 on blob uploads)
      # can never fail a release the installer depends on. It must still be
      # loud: `continue-on-error` alone leaves the check green when the
      # mirror does nothing at all, which is how the 413 below went unseen
      # for four releases.
      - name: Mirror to Gitea
        id: mirror
        continue-on-error: true
        env:
          GITEA_TAGS: ${{ steps.tags.outputs.gitea }}
          GHCR_IMAGES: ${{ steps.tags.outputs.ghcr }}
        run: |
          set -uo pipefail
          first_ghcr="$(printf '%s\n' "$GHCR_IMAGES" | head -n1)"
          args=()
          while IFS= read -r tag; do
            [ -n "$tag" ] || continue
            args+=(--tag "${tag}")
          done <<< "$GITEA_TAGS"

          output="$(mktemp)"
          status=0
          docker buildx imagetools create "${args[@]}" "${first_ghcr}" 2>&1 | tee "$output" || status=$?

          if [ "$status" -eq 0 ]; then
            {
              echo "### Gitea mirror"
              echo
              echo "Mirrored \`${first_ghcr}\` to:"
              echo
              printf -- '- \`%s\`\n' $GITEA_TAGS
            } >> "$GITHUB_STEP_SUMMARY"
            exit 0
          fi

          # The usual cause: git.tben.me sits behind Cloudflare, whose
          # request-body cap is 100 MB, and this image has a 243 MiB
          # `bun install` layer that no route through it can carry.
          reason="$(grep -oE '[0-9]{3} [A-Za-z ]{0,40}' "$output" | tail -n1)"
          {
            echo "### Gitea mirror failed"
            echo
            echo "\`${first_ghcr}\` did **not** reach the Gitea registry. The release itself is fine: the installer defaults to GHCR."
            echo
            echo '```'
            tail -n 12 "$output"
            echo '```'
            echo
            echo "See the [registry push limits](https://developers.cloudflare.com/workers/platform/limits/): git.tben.me is behind Cloudflare, which refuses any request body over 100 MB, and this image's \`bun install\` layer alone is about 243 MiB."
          } >> "$GITHUB_STEP_SUMMARY"
          echo "::warning title=Gitea mirror failed::${reason:-docker buildx imagetools create failed}; the image did not reach git.tben.me. See the job summary."
          exit "$status"