#!/usr/bin/env bash
set -euo pipefail

SCRIPT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
REPO_ROOT="$(cd -- "${SCRIPT_DIR}/../.." && pwd)"

MODE="${MODE:-tcp}"
ACTION="up"
DETACH="${DETACH:-1}"
BUILD="${BUILD:-1}"
TARGET_PLATFORM="${TARGET_PLATFORM:-linux/arm64}"
SERVER_IMAGE="${SERVER_IMAGE:-${RPKI_RTR_SERVER_IMAGE:-rpki-rtr:latest}}"
BUILDX_PUSH="${BUILDX_PUSH:-0}"
BUILDX_BUILDER="${BUILDX_BUILDER:-}"
SKIP_BASE_IMAGE_PULL="${SKIP_BASE_IMAGE_PULL:-0}"

usage() {
  cat <<'EOF'
Usage:
  deploy/server/build-run.sh [action] [options]

Actions:
  up            Build and start server (default)
  build         Build server image with docker compose
  buildx        Build server image with docker buildx
  rebuild       Rebuild image without cache, then start server
  down|stop     Stop server compose stack
  restart       Stop, then build and start server
  logs          Follow server logs
  ps            Show server compose status

Options:
  --mode MODE       base|tcp|tls|ssh (default: tcp)
  --platform VALUE  Target platform for buildx (default: linux/arm64)
  --server-image TAG
                    Server image tag for buildx and compose
  --push            Push buildx image instead of loading it locally
  --builder NAME    buildx builder name
  --skip-base-pull  Do not pull Dockerfile base images before buildx
  --foreground      Run server in foreground
  --no-build        Start without --build
  -h|--help         Show this help
EOF
}

die() {
  echo "error: $*" >&2
  exit 1
}

has_compose() {
  docker compose version >/dev/null 2>&1
}

has_buildx() {
  docker buildx version >/dev/null 2>&1
}

pull_base_images() {
  [[ "${SKIP_BASE_IMAGE_PULL}" == "1" ]] && return

  local platform image
  local -a platforms images
  IFS=',' read -r -a platforms <<< "${TARGET_PLATFORM}"
  images=(rust:1.89-bookworm debian:bookworm-slim)

  for platform in "${platforms[@]}"; do
    for image in "${images[@]}"; do
      docker pull --platform "${platform}" "${image}"
    done
  done
}

compose_files() {
  case "${MODE}" in
    base) printf '%s\n' -f "${SCRIPT_DIR}/docker-compose.yml" ;;
    tcp) printf '%s\n' -f "${SCRIPT_DIR}/docker-compose.tcp.yml" ;;
    tls) printf '%s\n' -f "${SCRIPT_DIR}/docker-compose.tls.yml" ;;
    ssh) printf '%s\n' -f "${SCRIPT_DIR}/docker-compose.ssh.yml" ;;
    *) die "unsupported mode '${MODE}', expected base|tcp|tls|ssh" ;;
  esac
}

compose_args() {
  local -a args files
  args=()
  [[ -f "${SCRIPT_DIR}/.env" ]] && args+=(--env-file "${SCRIPT_DIR}/.env")
  mapfile -t files < <(compose_files)
  args+=("${files[@]}")
  printf '%s\n' "${args[@]}"
}

compose_run() {
  local -a args
  mapfile -t args < <(compose_args)
  docker compose "${args[@]}" "$@"
}

up_server() {
  local -a up_args
  up_args=(up)
  [[ "${DETACH}" == "1" ]] && up_args+=(-d)
  [[ "${BUILD}" == "1" ]] && up_args+=(--build)
  compose_run "${up_args[@]}"
}

buildx_server() {
  has_buildx || die "docker buildx is not available"
  if [[ "${TARGET_PLATFORM}" == *,* && "${BUILDX_PUSH}" != "1" ]]; then
    die "multi-platform buildx output requires --push"
  fi

  local -a output_args builder_args
  [[ "${BUILDX_PUSH}" == "1" ]] && output_args=(--push) || output_args=(--load)
  [[ -n "${BUILDX_BUILDER}" ]] && builder_args=(--builder "${BUILDX_BUILDER}") || builder_args=()

  pull_base_images

  docker buildx build "${builder_args[@]}" \
    --platform "${TARGET_PLATFORM}" \
    -f "${SCRIPT_DIR}/Dockerfile" \
    -t "${SERVER_IMAGE}" \
    "${output_args[@]}" \
    "${REPO_ROOT}"
}

while [[ $# -gt 0 ]]; do
  case "$1" in
    up|build|buildx|rebuild|down|stop|restart|logs|ps)
      ACTION="$1"
      shift
      ;;
    --mode)
      [[ $# -ge 2 ]] || die "--mode requires a value"
      MODE="$2"
      shift 2
      ;;
    --platform)
      [[ $# -ge 2 ]] || die "--platform requires a value"
      TARGET_PLATFORM="$2"
      shift 2
      ;;
    --server-image)
      [[ $# -ge 2 ]] || die "--server-image requires a value"
      SERVER_IMAGE="$2"
      shift 2
      ;;
    --push)
      BUILDX_PUSH=1
      shift
      ;;
    --builder)
      [[ $# -ge 2 ]] || die "--builder requires a value"
      BUILDX_BUILDER="$2"
      shift 2
      ;;
    --skip-base-pull)
      SKIP_BASE_IMAGE_PULL=1
      shift
      ;;
    --foreground)
      DETACH=0
      shift
      ;;
    --no-build)
      BUILD=0
      shift
      ;;
    -h|--help)
      usage
      exit 0
      ;;
    *)
      die "unknown argument '$1'"
      ;;
  esac
done

export RPKI_RTR_SERVER_IMAGE="${SERVER_IMAGE}"
if [[ "${ACTION}" == "buildx" ]]; then
  has_buildx || die "docker buildx is not available"
else
  has_compose || die "docker compose is not available"
fi

cd "${REPO_ROOT}"

case "${ACTION}" in
  up)
    up_server
    ;;
  build)
    compose_run build
    ;;
  buildx)
    buildx_server
    ;;
  rebuild)
    compose_run build --no-cache
    up_server
    ;;
  down|stop)
    compose_run down
    ;;
  restart)
    compose_run down
    up_server
    ;;
  logs)
    compose_run logs -f
    ;;
  ps)
    compose_run ps
    ;;
esac