#!/usr/bin/env bash
# Erlang builder + runtime в registry (git.sabilin.com/eventhub/*:latest).
#
# Usage:
#   ./scripts/build-erlang-base-images.sh           # pull latest или собрать локально
#   ./scripts/build-erlang-base-images.sh --push  # + push :latest в registry
#   ./scripts/build-erlang-base-images.sh --force-build  # пересобрать без pull
set -euo pipefail

PUSH=0
FORCE=0
for arg in "$@"; do
  case "${arg}" in
    --push) PUSH=1 ;;
    --force-build) FORCE=1 ;;
  esac
done

REGISTRY="${REGISTRY:-git.sabilin.com/eventhub}"
ROOT="$(cd "$(dirname "$0")/.." && pwd)"
BUILDER="${REGISTRY}/erlang-builder:latest"
RUNTIME="${REGISTRY}/erlang-runtime:latest"

check_alpine_sync() {
  local erlang_ver runtime_ver erlang_mm
  erlang_ver="$(docker run --rm erlang:28-alpine cat /etc/alpine-release)"
  runtime_ver="$(grep '^ARG ALPINE_VERSION=' "${ROOT}/docker/erlang/Dockerfile.runtime" | cut -d= -f2)"
  erlang_mm="$(echo "${erlang_ver}" | cut -d. -f1-2)"
  if [[ "${erlang_mm}" != "${runtime_ver}" ]]; then
    echo "ERROR: erlang:28-alpine uses Alpine ${erlang_ver}, runtime pins ${runtime_ver}"
    echo "       Обновите ALPINE_VERSION в docker/erlang/Dockerfile.runtime"
    exit 1
  fi
  echo "Alpine sync OK: ${erlang_mm} (erlang image ${erlang_ver})"
}

build_one() {
  local file="$1"
  local tag="$2"
  local extra=()
  if docker image inspect "${tag}" >/dev/null 2>&1; then
    extra+=(--cache-from "${tag}")
  fi
  bash "${ROOT}/scripts/retry-docker-build.sh" 5 60 -- \
    docker buildx build \
      --network=host \
      --pull \
      "${extra[@]}" \
      --file "${file}" \
      --tag "${tag}" \
      --load \
      --provenance=false \
      --sbom=false \
      "${ROOT}"
}

try_pull_bases() {
  docker pull "${BUILDER}" >/dev/null 2>&1 && docker pull "${RUNTIME}" >/dev/null 2>&1
}

need_build=1
if (( FORCE == 0 )) && try_pull_bases; then
  echo "Using erlang base images from registry:"
  echo "  ${BUILDER}"
  echo "  ${RUNTIME}"
  need_build=0
fi

if (( need_build )); then
  echo "Building erlang base images locally..."
  check_alpine_sync
  build_one "${ROOT}/docker/erlang/Dockerfile.builder" "${BUILDER}"
  build_one "${ROOT}/docker/erlang/Dockerfile.runtime" "${RUNTIME}"
  echo "=== erlang base images built ==="
  echo "  ${BUILDER}"
  echo "  ${RUNTIME}"
fi

if (( PUSH )); then
  bash "${ROOT}/scripts/retry-docker-build.sh" 5 30 -- docker push "${BUILDER}"
  bash "${ROOT}/scripts/retry-docker-build.sh" 5 30 -- docker push "${RUNTIME}"
  echo "Pushed ${BUILDER} and ${RUNTIME}"
fi