#!/usr/bin/env bash
# Ensure Docker daemon is reachable on WSL host runner (Docker Desktop integration).
# Usage: ensure-docker-daemon.sh [max_wait_seconds]
set -euo pipefail

MAX_WAIT="${1:-240}"
INTERVAL=5
DEADLINE=$((SECONDS + MAX_WAIT))

docker_ok() {
  timeout 8 docker info >/dev/null 2>&1
}

find_docker_host() {
  local candidates=(
    "${DOCKER_HOST:-}"
    "unix:///var/run/docker.sock"
    "unix:///mnt/wsl/docker-desktop/shared-sockets/guest-services/docker.sock"
    "unix:///mnt/wsl/docker-desktop/shared-sockets/guest-services/docker.proxy.sock"
    "unix:///mnt/wsl/docker-desktop/shared-sockets/guest-services/docker.container-proxy.sock"
  )
  local host path
  for host in "${candidates[@]}"; do
    [[ -n "${host}" ]] || continue
    path="${host#unix://}"
    if [[ -S "${path}" ]] && DOCKER_HOST="${host}" docker_ok; then
      export DOCKER_HOST="${host}"
      echo "Docker ready (${host})"
      return 0
    fi
  done
  if docker_ok; then
    echo "Docker ready (default socket)"
    return 0
  fi
  return 1
}

start_docker_desktop() {
  local exe="/mnt/c/Program Files/Docker/Docker/Docker Desktop.exe"
  if [[ -f "${exe}" ]]; then
    echo "Starting Docker Desktop..."
    powershell.exe -NoProfile -Command "Start-Process 'C:\\Program Files\\Docker\\Docker\\Docker Desktop.exe'" >/dev/null 2>&1 || true
    return 0
  fi
  echo "Docker Desktop executable not found"
  return 1
}

attempt=0
while (( SECONDS < DEADLINE )); do
  attempt=$((attempt + 1))
  if find_docker_host; then
    exit 0
  fi
  if (( attempt == 1 || attempt == 7 )); then
    start_docker_desktop || true
  fi
  echo "waiting for docker (${attempt}, $((DEADLINE - SECONDS))s left)..."
  sleep "${INTERVAL}"
done

echo "Docker daemon not available after ${MAX_WAIT}s"
echo "Hint: start Docker Desktop on Windows and enable WSL integration."
exit 1