#!/usr/bin/env bash

set -e

ROOT_DIR="$1"
PROJECT_DIR="$2"
DOCKERFILE="$3"
TAGGED_IMAGE="$4"
ID_FILE="$5"
FOLLOW_SYMLINKS="$6"
DOCKER_BUILD_ARCH="${DOCKER_BUILD_ARCH:-amd64}"
# https://docs.docker.com/develop/develop-images/build_enhancements/
export DOCKER_BUILDKIT=1

cd "$ROOT_DIR"
. tools/lib/lib.sh
assert_root

cd "$PROJECT_DIR"

function validate_dockerignore() {
  excludes_all=$(grep -w '^\*$' .dockerignore || true)
  excludes_except=$(grep -w '^!.*' .dockerignore || true)
  if [ -n "$excludes_all" ] || [ -n "$excludes_except" ]; then
    error "Cannot include exclusion exceptions when following symlinks. Please use an exclude pattern that doesn't use exclude-all (e.g: *) or exclude-except (e.g: !/some/pattern)"
  fi
}

args=(
    -f "$DOCKERFILE"
    -t "$TAGGED_IMAGE"
    --iidfile "$ID_FILE"
)

if [ "$FOLLOW_SYMLINKS" == "true" ]; then
  exclusions=()
  if [ -f ".dockerignore" ]; then
    validate_dockerignore
    exclusions+=(--exclude-from .dockerignore)
  fi
  # Docker does not follow symlinks in the build context. So we create a tar of the directory, following symlinks, and provide the archive to Docker
  # to use as the build context
  tar cL "${exclusions[@]}" . | docker build - "${args[@]}"
else
  JDK_VERSION="${JDK_VERSION:-17.0.4}"
  if [[ -z "${DOCKER_BUILD_PLATFORM}" ]]; then
    docker build --build-arg JDK_VERSION="$JDK_VERSION" --build-arg DOCKER_BUILD_ARCH="$DOCKER_BUILD_ARCH" . "${args[@]}"
  else
    docker build --build-arg JDK_VERSION="$JDK_VERSION" --build-arg DOCKER_BUILD_ARCH="$DOCKER_BUILD_ARCH" --platform="$DOCKER_BUILD_PLATFORM" . "${args[@]}"
  fi
fi