# Automatic environment detection and optimization
config :foundation,
  profile: :auto,  # Detects and optimizes based on environment
  # Development: mdns_lite + local Horde
  # Staging: libcluster(K8s) + Horde + Phoenix.PubSub  
  # Production: libcluster(Consul) + Horde + Phoenix.PubSub + Nebulex

defmodule Foundation.Orchestrator do
  @doc "Automatically configure optimal tool combination"
  def configure_for_environment() do
    case detect_environment() do
      :development ->
        %{
          clustering: {MdnsLite, auto_discovery_config()},
          messaging: {Phoenix.PubSub, local_config()},
          processes: {local_supervisor_config()},
          caching: {local_ets_config()}
        }
      
      :production ->
        %{
          clustering: {Cluster.Strategy.auto_detect(), optimal_config()},
          messaging: {Phoenix.PubSub, distributed_config()},
          processes: {Horde, production_config()},
          caching: {Nebulex, distributed_cache_config()}
        }
      
      :enterprise ->
        %{
          clustering: multi_cluster_config(),
          messaging: federated_pubsub_config(),
          processes: multi_horde_config(),
          caching: distributed_cache_federation()
        }
    end
  end
end

defmodule Foundation.ProcessManager do
  @doc "Smart process distribution based on requirements"
  def start_distributed_process(module, args, opts \\ []) do
    strategy = determine_distribution_strategy(module, opts)
    
    case strategy do
      :singleton ->
        # Use Horde for cluster-wide singletons
        Horde.DynamicSupervisor.start_child(
          Foundation.DistributedSupervisor,
          {module, args}
        )
      
      :replicated ->
        # Start on all nodes for redundancy
        start_on_all_nodes(module, args)
      
      :partitioned ->
        # Use consistent hashing for partitioned processes
        target_node = Foundation.Routing.hash_to_node(args)
        start_on_node(target_node, module, args)
      
      :local ->
        # Standard local supervision
        DynamicSupervisor.start_child(module, args)
    end
  end
end

defmodule Foundation.Messaging do
  @doc "Context-aware message routing"
  def send_message(target, message, opts \\ []) do
    case resolve_target(target) do
      {:local, pid} ->
        # Direct local send
        send(pid, message)
      
      {:remote, node, name} ->
        # Remote process via PubSub or direct
        route_remote_message(node, name, message, opts)
      
      {:service, service_name} ->
        # Service discovery + load balancing
        Foundation.ServiceMesh.route_to_service(service_name, message, opts)
      
      {:broadcast, topic} ->
        # Cluster-wide broadcast via Phoenix.PubSub
        Phoenix.PubSub.broadcast(Foundation.PubSub, topic, message)
      
      {:group, group_name} ->
        # Process group messaging
        send_to_group(group_name, message)
    end
  end
end

# mix.exs
{:foundation, "~> 2.0"}

# NOTHING ELSE NEEDED
# Foundation automatically:
# - Uses mdns_lite for service discovery
# - Enables local clustering for development  
# - Provides distributed debugging
# - Hot reload coordination

# config/prod.exs  
config :foundation, cluster: :kubernetes
# Automatically configures:
# - libcluster with K8s strategy
# - Horde for distributed processes
# - Phoenix.PubSub for messaging
# - Health checks and observability

config :foundation,
  clustering: %{
    strategy: {Cluster.Strategy.Kubernetes, [...]},
    fallback: {Cluster.Strategy.Gossip, [...]}
  },
  processes: %{
    supervisor: Horde.DynamicSupervisor,
    registry: Horde.Registry,
    distribution: :consistent_hash
  },
  messaging: %{
    adapter: Phoenix.PubSub.PG2,
    topics: [:events, :commands, :queries],
    compression: true
  },
  caching: %{
    adapter: Nebulex.Adapters.Distributed,
    backend: Nebulex.Adapters.Redis
  }

config :foundation,
  clusters: %{
    app: [
      clustering: {Cluster.Strategy.Kubernetes, [...]},
      processes: [:web_servers, :background_jobs],
      messaging: [:events, :commands]
    ],
    ai: [
      clustering: {Cluster.Strategy.Consul, [...]}, 
      processes: [:ai_workers, :model_cache],
      messaging: [:inference_requests, :model_updates]
    ],
    data: [
      clustering: {Cluster.Strategy.DNS, [...]},
      processes: [:stream_processors, :aggregators],
      messaging: [:data_events, :analytics]
    ]
  }

defmodule Foundation.Horde.Manager do
  @doc "Handle Horde's eventual consistency intelligently"
  def start_child_with_retry(supervisor, child_spec, opts \\ []) do
    max_retries = Keyword.get(opts, :max_retries, 3)
    retry_delay = Keyword.get(opts, :retry_delay, 100)
    
    case Horde.DynamicSupervisor.start_child(supervisor, child_spec) do
      {:ok, pid} ->
        # Wait for registry sync if needed
        case Keyword.get(opts, :wait_for_registry, false) do
          true -> wait_for_registry_sync(child_spec.id, pid)
          false -> {:ok, pid}
        end
      
      {:error, reason} when max_retries > 0 ->
        :timer.sleep(retry_delay)
        start_child_with_retry(supervisor, child_spec, 
          Keyword.merge(opts, [max_retries: max_retries - 1]))
      
      error ->
        error
    end
  end
  
  defp wait_for_registry_sync(name, expected_pid, timeout \\ 1000) do
    start_time = :os.system_time(:millisecond)
    do_wait_for_sync(name, expected_pid, start_time, timeout)
  end
  
  defp do_wait_for_sync(name, expected_pid, start_time, timeout) do
    case Foundation.ProcessRegistry.lookup(name) do
      [{^expected_pid, _}] -> 
        {:ok, expected_pid}
      [] when :os.system_time(:millisecond) - start_time < timeout ->
        :timer.sleep(50)
        do_wait_for_sync(name, expected_pid, start_time, timeout)
      _ ->
        {:error, :registry_sync_timeout}
    end
  end
end

defmodule Foundation.PubSub.TopicManager do
  @doc "Intelligent topic routing and management"
  def subscribe_with_pattern(pattern, handler) do
    topics = discover_matching_topics(pattern)
    
    Enum.each(topics, fn topic ->
      Phoenix.PubSub.subscribe(Foundation.PubSub, topic)
    end)
    
    # Register pattern for future topic matching
    register_pattern_subscription(pattern, handler)
  end
  
  def broadcast_with_routing(message, opts \\ []) do
    case determine_routing_strategy(message, opts) do
      {:local, topic} ->
        Phoenix.PubSub.broadcast(Foundation.PubSub, topic, message)
      
      {:filtered, topic, filter_fn} ->
        # Only send to subscribers matching filter
        filtered_broadcast(topic, message, filter_fn)
      
      {:federated, clusters} ->
        # Cross-cluster broadcasting
        broadcast_across_clusters(clusters, message)
    end
  end
end

# Automatic distributed debugging across Foundation cluster
defmodule ElixirScope.Distributed do
  def trace_request_across_cluster(request_id) do
    # Use Foundation's messaging to coordinate tracing
    Foundation.Messaging.broadcast({:trace_request, request_id}, 
      topic: "elixir_scope:tracing"
    )
    
    # Collect traces from all nodes
    Foundation.ProcessManager.start_distributed_process(
      ElixirScope.TraceCollector,
      [request_id: request_id],
      strategy: :singleton
    )
  end
end

# Leverage Foundation for distributed AI optimization
defmodule DSPEx.DistributedOptimizer do
  def optimize_across_foundation_cluster(program, dataset, metric) do
    # Use Foundation's intelligent process distribution
    workers = Foundation.ProcessManager.start_process_group(
      DSPEx.EvaluationWorker,
      count: Foundation.Cluster.optimal_worker_count(),
      strategy: :distributed
    )
    
    # Distribute work via Foundation messaging
    results = Foundation.WorkDistribution.map_reduce(
      dataset,
      workers,
      fn examples -> DSPEx.Evaluate.run(program, examples, metric) end,
      fn scores -> Enum.sum(scores) / length(scores) end
    )
    
    results
  end
end

# Start a distributed service - Foundation figures out how
Foundation.start_service(MyService, args)

# Send a message anywhere in the system
Foundation.send(:user_service, {:process_user, user_id})

# Get cluster information 
Foundation.cluster_info()

# Explicit Horde usage
Foundation.Horde.start_child(MyService, args, wait_for_sync: true)

# Explicit PubSub usage  
Foundation.PubSub.broadcast("user:events", {:user_updated, user})

# Explicit clustering
Foundation.Cluster.join_strategy(:kubernetes, kubernetes_config())

# Direct tool access when needed
Horde.DynamicSupervisor.start_child(MyApp.HordeSupervisor, child_spec)
Phoenix.PubSub.broadcast(MyApp.PubSub, "topic", message)
Cluster.Strategy.Kubernetes.start_link(config)

defmodule Foundation.Profiles do
  def development_profile() do
    %{
      clustering: %{
        strategy: Foundation.Strategy.MdnsLite,
        config: [
          service_name: "foundation-dev",
          auto_connect: true,
          discovery_interval: 1000
        ]
      },
      
      messaging: %{
        adapter: Phoenix.PubSub.PG2,
        local_only: true
      },
      
      processes: %{
        distribution: :local,
        supervisor: DynamicSupervisor
      },
      
      caching: %{
        adapter: :ets,
        local_only: true
      },
      
      features: [
        :hot_reload_coordination,
        :distributed_debugging,
        :development_dashboard
      ]
    }
  end
  
  def production_profile() do
    %{
      clustering: %{
        strategy: auto_detect_clustering_strategy(),
        config: auto_detect_clustering_config(),
        fallback_strategy: {Cluster.Strategy.Gossip, gossip_config()}
      },
      
      messaging: %{
        adapter: Phoenix.PubSub.PG2,
        compression: true,
        batching: true
      },
      
      processes: %{
        distribution: :horde,
        supervisor: Horde.DynamicSupervisor,
        registry: Horde.Registry,
        sync_interval: 100
      },
      
      caching: %{
        adapter: Nebulex.Adapters.Distributed,
        backend: auto_detect_cache_backend(),
        replication: :async
      },
      
      features: [
        :health_monitoring,
        :performance_metrics,
        :automatic_scaling,
        :partition_healing
      ]
    }
  end
  
  def enterprise_profile() do
    %{
      clustering: %{
        multi_cluster: true,
        clusters: auto_detect_clusters(),
        federation: :enabled
      },
      
      messaging: %{
        federated_pubsub: true,
        cross_cluster_routing: true,
        advanced_topology: true
      },
      
      processes: %{
        multi_cluster_distribution: true,
        global_process_migration: true,
        advanced_placement_strategies: true
      },
      
      features: [
        :multi_cluster_management,
        :advanced_observability,
        :global_load_balancing,
        :disaster_recovery,
        :compliance_monitoring
      ]
    }
  end
end

defmodule Foundation.EnvironmentDetector do
  def detect_optimal_configuration() do
    environment = detect_environment()
    infrastructure = detect_infrastructure()
    scale = detect_scale_requirements()
    
    %{
      profile: determine_profile(environment, infrastructure, scale),
      clustering_strategy: determine_clustering_strategy(infrastructure),
      messaging_config: determine_messaging_config(scale, infrastructure),
      process_distribution: determine_process_distribution(scale),
      caching_strategy: determine_caching_strategy(scale, infrastructure)
    }
  end
  
  defp detect_environment() do
    cond do
      System.get_env("MIX_ENV") == "dev" -> :development
      kubernetes_environment?() -> :kubernetes
      docker_environment?() -> :containerized  
      cloud_environment?() -> :cloud
      true -> :production
    end
  end
  
  defp detect_infrastructure() do
    cond do
      kubernetes_available?() -> :kubernetes
      consul_available?() -> :consul
      dns_srv_available?() -> :dns
      aws_environment?() -> :aws
      gcp_environment?() -> :gcp
      true -> :static
    end
  end
  
  defp detect_scale_requirements() do
    expected_nodes = System.get_env("FOUNDATION_EXPECTED_NODES", "1") |> String.to_integer()
    
    cond do
      expected_nodes == 1 -> :single_node
      expected_nodes <= 10 -> :small_cluster
      expected_nodes <= 100 -> :medium_cluster
      expected_nodes <= 1000 -> :large_cluster
      true -> :massive_cluster
    end
  end
end

defmodule Foundation.ServiceMesh do
  @doc "Intelligent service discovery and routing"
  def register_service(name, pid, capabilities \\ []) do
    # Register in multiple systems for redundancy
    registrations = [
      # Local ETS for fast lookup
      Foundation.LocalRegistry.register(name, pid, capabilities),
      
      # Horde for cluster-wide distribution
      Foundation.Horde.Registry.register(
        via_tuple(name), 
        pid, 
        capabilities
      ),
      
      # Phoenix.PubSub for service announcements
      Foundation.PubSub.broadcast(
        "services:announcements",
        {:service_registered, name, Node.self(), capabilities}
      )
    ]
    
    case Enum.all?(registrations, &match?({:ok, _}, &1)) do
      true -> {:ok, :registered}
      false -> {:error, :partial_registration}
    end
  end
  
  def route_to_service(service_name, message, opts \\ []) do
    routing_strategy = Keyword.get(opts, :strategy, :load_balanced)
    
    case find_service_instances(service_name) do
      [] -> 
        {:error, :service_not_found}
      
      [instance] -> 
        send_to_instance(instance, message)
      
      instances when length(instances) > 1 ->
        case routing_strategy do
          :load_balanced -> 
            route_load_balanced(instances, message)
          :broadcast -> 
            route_broadcast(instances, message)
          :closest -> 
            route_to_closest(instances, message)
          {:filter, filter_fn} -> 
            route_filtered(instances, message, filter_fn)
        end
    end
  end
end

defmodule Foundation.Federation do
  @doc "Cross-cluster communication and coordination"
  def send_to_cluster(cluster_name, service_name, message, opts \\ []) do
    case Foundation.ClusterRegistry.lookup(cluster_name) do
      {:ok, cluster_config} ->
        # Use cluster-specific communication method
        case cluster_config.communication_method do
          :direct ->
            send_direct_to_cluster(cluster_config, service_name, message)
          
          :gateway ->
            send_via_gateway(cluster_config, service_name, message)
          
          :pubsub ->
            send_via_federated_pubsub(cluster_config, service_name, message)
        end
      
      :not_found ->
        {:error, {:cluster_not_found, cluster_name}}
    end
  end
  
  def federate_clusters(clusters, opts \\ []) do
    federation_strategy = Keyword.get(opts, :strategy, :mesh)
    
    case federation_strategy do
      :mesh ->
        # Full mesh federation - every cluster connected to every other
        create_mesh_federation(clusters)
      
      :hub_and_spoke ->
        # Central hub with spokes
        create_hub_spoke_federation(clusters, opts[:hub])
      
      :hierarchical ->
        # Tree-like hierarchy
        create_hierarchical_federation(clusters, opts[:hierarchy])
    end
  end
end

defmodule Foundation.Context do
  @doc "Automatic context propagation across all boundaries"
  def with_context(context_map, fun) do
    # Store context in process dictionary
    old_context = Process.get(:foundation_context, %{})
    new_context = Map.merge(old_context, context_map)
    Process.put(:foundation_context, new_context)
    
    try do
      fun.()
    after
      Process.put(:foundation_context, old_context)
    end
  end
  
  def propagate_context(target, message) when is_pid(target) do
    context = Process.get(:foundation_context, %{})
    enhanced_message = {:foundation_context_message, context, message}
    send(target, enhanced_message)
  end
  
  def propagate_context({:via, registry, name}, message) do
    context = Process.get(:foundation_context, %{})
    enhanced_message = {:foundation_context_message, context, message}
    
    case registry do
      Horde.Registry ->
        # Use Horde's via tuple with context
        GenServer.cast({:via, registry, name}, enhanced_message)
      
      _ ->
        # Standard registry
        GenServer.cast({:via, registry, name}, enhanced_message)
    end
  end
end

defmodule Foundation.ConnectionManager do
  @doc "Optimize connections based on cluster topology and traffic patterns"
  def optimize_connections() do
    cluster_info = Foundation.Cluster.analyze_topology()
    traffic_patterns = Foundation.Telemetry.get_traffic_patterns()
    
    optimizations = [
      optimize_horde_sync_intervals(cluster_info, traffic_patterns),
      optimize_pubsub_subscriptions(traffic_patterns),
      optimize_cache_replication(cluster_info),
      optimize_process_placement(cluster_info, traffic_patterns)
    ]
    
    apply_optimizations(optimizations)
  end
  
  defp optimize_horde_sync_intervals(cluster_info, traffic_patterns) do
    # Adjust sync intervals based on cluster size and change frequency
    optimal_interval = case {cluster_info.node_count, traffic_patterns.change_frequency} do
      {nodes, :high} when nodes < 10 -> 50    # Fast sync for small, busy clusters
      {nodes, :high} when nodes < 50 -> 100   # Moderate sync for medium clusters
      {nodes, :medium} when nodes < 10 -> 100
      {nodes, :medium} when nodes < 50 -> 200
      {nodes, :low} -> 500                    # Slower sync for stable clusters
      _ -> 1000                               # Conservative for large clusters
    end
    
    {:horde_sync_interval, optimal_interval}
  end
end

defmodule Foundation.LoadBalancer do
  @doc "Intelligent load balancing based on real-time metrics"
  def route_request(service_name, request, opts \\ []) do
    instances = Foundation.ServiceMesh.get_healthy_instances(service_name)
    strategy = determine_optimal_strategy(instances, request, opts)
    
    case strategy do
      {:least_connections, instance} ->
        route_to_instance_with_tracking(instance, request)
      
      {:least_latency, instance} ->
        route_with_latency_monitoring(instance, request)
      
      {:resource_aware, instance} ->
        route_with_resource_monitoring(instance, request)
      
      {:geographic, instance} ->
        route_to_closest_instance(instance, request)
    end
  end
  
  defp determine_optimal_strategy(instances, request, opts) do
    # Analyze instance health, load, and characteristics
    instance_metrics = Enum.map(instances, &get_instance_metrics/1)
    request_characteristics = analyze_request(request)
    
    case {length(instances), request_characteristics.type} do
      {1, _} -> 
        {:single_instance, hd(instances)}
      
      {_, :cpu_intensive} -> 
        {:least_cpu_usage, find_least_cpu_instance(instance_metrics)}
      
      {_, :memory_intensive} -> 
        {:least_memory_usage, find_least_memory_instance(instance_metrics)}
      
      {_, :io_intensive} -> 
        {:least_connections, find_least_connections_instance(instance_metrics)}
      
      _ -> 
        {:round_robin, round_robin_select(instances)}
    end
  end
end