#!/bin/bash

defaultimage="ansible:deb13"

export ANSIBLE_HOST_KEY_CHECKING=False
export ANSIBLE_SSH_ARGS='-o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null'
export ANSIBLE_CONFIG=./ansible.cfg

# Ermittle den nächsten freien Container-Namen
base_name="ansible"
network_name="ansible-dualstack"
counter=1
while docker ps -a --format '{{.Names}}' | grep -q "^${base_name}-${counter}$"; do
  counter=$((counter + 1))
done
container_name="${base_name}-${counter}"

if docker network inspect "$network_name" >/dev/null 2>&1; then
  network_ipv6_enabled=$(docker network inspect -f '{{.EnableIPv6}}' "$network_name" 2>/dev/null)
  if [ "$network_ipv6_enabled" != "true" ]; then
    echo "Docker-Netzwerk '$network_name' existiert bereits ohne IPv6-Unterstuetzung." >&2
    echo "Bitte Netzwerk entfernen oder einen anderen Netzwerknamen verwenden." >&2
    exit 1
  fi
else
  if ! docker network create --driver bridge --ipv6 "$network_name" >/dev/null; then
    echo "Docker-Netzwerk '$network_name' mit IPv6 konnte nicht erstellt werden." >&2
    echo "Pruefe, ob Docker IPv6 fuer benutzerdefinierte Bridge-Netze unterstuetzt." >&2
    exit 1
  fi
fi

docker run --rm -dit \
  --name "$container_name" \
  --hostname "$container_name" \
  --network "$network_name" \
  -e ANSIBLE_HOST_KEY_CHECKING=False \
  -e ANSIBLE_SSH_ARGS='-o StrictHostKeyChecking=no -o UserKnownHostsFile=/dev/null' \
  -e ANSIBLE_CONFIG=./ansible.cfg \
  -v "$(pwd):/ansible" \
  -v ansible_ssh_keys:/root/.ssh \
  -w /ansible \
  $defaultimage \
  "/bin/bash"

docker exec "$container_name" sh -lc "mkdir -p /root/.ssh && chmod 700 /root/.ssh && printf 'Host *\n  StrictHostKeyChecking no\n  UserKnownHostsFile /dev/null\n' > /root/.ssh/config && chmod 600 /root/.ssh/config"

container_ipv4=$(docker inspect -f '{{range .NetworkSettings.Networks}}{{if .IPAddress}}{{.IPAddress}}{{end}}{{end}}' "$container_name" 2>/dev/null)
container_ipv6=$(docker inspect -f '{{range .NetworkSettings.Networks}}{{if .GlobalIPv6Address}}{{.GlobalIPv6Address}}{{end}}{{end}}' "$container_name" 2>/dev/null)
container_os=$(docker exec "$container_name" sh -c 'grep PRETTY_NAME /etc/os-release 2>/dev/null | cut -d= -f2 | tr -d "\"" 2>/dev/null')

echo "-----------------------------------"
echo "Container Name : $container_name"
echo "Container IPv4 : ${container_ipv4:-n/a}"
echo "Container IPv6 : ${container_ipv6:-n/a}"
echo "Container OS   : ${container_os:-n/a}"
echo "-----------------------------------"

docker attach "$container_name"