#!/usr/bin/env bash
# Check the host prerequisites for the manual standalone installation path.
set -euo pipefail

fail() {
  echo "check-standalone-prerequisites.sh: $*" >&2
  exit 1
}

require_command() {
  command -v "$1" >/dev/null 2>&1 || fail "required command is missing: $1"
}

require_command git
require_command docker
require_command bash
require_command curl
require_command openssl
require_command shasum

docker info >/dev/null 2>&1 || fail "Docker Engine is not reachable; start Docker Desktop or the Docker service"

compose_version=$(docker compose version --short 2>/dev/null) || {
  fail "Docker Compose v2 is not available as 'docker compose'"
}
[[ -n "$compose_version" ]] || fail "Docker Compose returned no version"

server_arch=$(docker version --format '{{.Server.Arch}}' 2>/dev/null) || {
  fail "could not determine the Docker server architecture"
}
server_arch_lower=$(printf '%s' "$server_arch" | tr '[:upper:]' '[:lower:]')
case "$server_arch_lower" in
  amd64|x86_64|arm64|aarch64) ;;
  *) fail "unsupported Docker server architecture: $server_arch (expected amd64 or arm64)" ;;
esac

printf 'Manual standalone prerequisites passed.\n'
printf '  Docker Compose: %s\n' "$compose_version"
printf '  Docker architecture: %s\n' "$server_arch"
printf '  Host shell: %s\n' "$(uname -s)/$(uname -m)"

if command -v tht >/dev/null 2>&1; then
  printf '  tht: %s\n' "$(command -v tht)"
else
  printf '  tht: not installed yet (run bash scripts/install-tht.sh next)\n'
fi