#!/usr/bin/env bash
# publish-image.sh — tag and push the runner image to a registry
set -euo pipefail

IMAGE_NAME="${IMAGE_NAME:-custom-gitea-runner}"
REGISTRY="${REGISTRY:-registry.alwisp.com}"
# Gitea Container Registry namespaces images under an owner (user/org), e.g.
# registry.alwisp.com/<owner>/<image>. Set REGISTRY_NAMESPACE to that owner.
REGISTRY_NAMESPACE="${REGISTRY_NAMESPACE:-jason}"
VERSION="${VERSION:-}"

if [ -z "$VERSION" ]; then
    echo "[ERROR] VERSION must be set (e.g. VERSION=v0.1.0 ./scripts/publish-image.sh)"
    exit 1
fi

# Build the remote repository path, including the namespace when one is set.
if [ -n "${REGISTRY_NAMESPACE}" ]; then
    REMOTE_REPO="${REGISTRY}/${REGISTRY_NAMESPACE}/${IMAGE_NAME}"
else
    REMOTE_REPO="${REGISTRY}/${IMAGE_NAME}"
fi

LOCAL_TAG="${IMAGE_NAME}:${VERSION}"
REMOTE_TAG="${REMOTE_REPO}:${VERSION}"
REMOTE_LATEST="${REMOTE_REPO}:latest"

# PLATFORMS (e.g. "linux/amd64,linux/arm64") triggers a multi-arch buildx build
# that is pushed directly as a single manifest list. This is the recommended
# path: Unraid hosts are amd64, so the published image must include amd64 even
# when built on an arm64 (Apple Silicon) machine. Leave unset for a single-arch
# tag-and-push of an already-built local image.
PLATFORMS="${PLATFORMS:-}"

if [ -n "${PLATFORMS}" ]; then
    VCS_REF="$(git rev-parse --short HEAD 2>/dev/null || echo unknown)"
    BUILD_DATE="$(date -u +%Y-%m-%dT%H:%M:%SZ)"
    echo "Building and pushing multi-arch (${PLATFORMS}) ${REMOTE_TAG} ..."
    docker buildx build \
        --platform "${PLATFORMS}" \
        --build-arg "VERSION=${VERSION}" \
        --build-arg "VCS_REF=${VCS_REF}" \
        --build-arg "BUILD_DATE=${BUILD_DATE}" \
        --tag "${REMOTE_TAG}" \
        --tag "${REMOTE_LATEST}" \
        --file docker/runner/Dockerfile \
        --push \
        .
    echo "Published multi-arch: ${REMOTE_TAG} (${PLATFORMS})"
    exit 0
fi

echo "Tagging ${LOCAL_TAG} as ${REMOTE_TAG} ..."
docker tag "${LOCAL_TAG}" "${REMOTE_TAG}"
docker tag "${LOCAL_TAG}" "${REMOTE_LATEST}"

echo "Pushing ${REMOTE_TAG} ..."
docker push "${REMOTE_TAG}"
docker push "${REMOTE_LATEST}"

echo "Published: ${REMOTE_TAG}"