defmodule Automata.IntegrationDeployment.DeploymentInfrastructure do
  @moduledoc """
  Deployment Infrastructure component for deploying Automata in production environments.
  
  This module provides functionality for:
  - Creating deployment configurations
  - Provisioning infrastructure resources
  - Deploying Automata systems
  - Monitoring and scaling deployments
  
  The Deployment Infrastructure component enables reliable and scalable deployment
  of Automata systems in various production environments.
  """
  
  use GenServer
  require Logger
  
  alias Automata.IntegrationDeployment.DeploymentInfrastructure.DeploymentManager
  alias Automata.IntegrationDeployment.DeploymentInfrastructure.ResourceProvisioner
  alias Automata.IntegrationDeployment.DeploymentInfrastructure.ConfigManager
  alias Automata.IntegrationDeployment.DeploymentInfrastructure.MonitoringAgent
  
  @type deployment_id :: binary()
  
  # Client API
  
  @doc """
  Starts the Deployment Infrastructure server.
  """
  def start_link(_opts) do
    GenServer.start_link(__MODULE__, :ok, name: __MODULE__)
  end
  
  @doc """
  Creates a deployment configuration for an Automata system.
  
  ## Parameters
  - name: Name of the deployment
  - config: Deployment configuration
    - environment: Target environment (:development, :staging, :production)
    - infrastructure: Infrastructure provider and settings
    - scale: Initial scaling configuration
    - resources: Resource requirements
  
  ## Returns
  - `{:ok, deployment_id}` if successful
  - `{:error, reason}` if failed
  """
  @spec create_deployment(binary(), map()) :: {:ok, deployment_id()} | {:error, term()}
  def create_deployment(name, config) do
    GenServer.call(__MODULE__, {:create_deployment, name, config})
  end
  
  @doc """
  Lists all deployments.
  
  ## Parameters
  - status: Optional status to filter by
  
  ## Returns
  - `{:ok, deployments}` list of deployments
  """
  @spec list_deployments(atom() | nil) :: {:ok, list(map())}
  def list_deployments(status \\ nil) do
    GenServer.call(__MODULE__, {:list_deployments, status})
  end
  
  @doc """
  Provisions infrastructure for a deployment.
  
  ## Parameters
  - deployment_id: ID of the deployment
  - options: Provisioning options
  
  ## Returns
  - `{:ok, resources}` if successful
  - `{:error, reason}` if failed
  """
  @spec provision_infrastructure(deployment_id(), map()) :: {:ok, map()} | {:error, term()}
  def provision_infrastructure(deployment_id, options \\ %{}) do
    GenServer.call(__MODULE__, {:provision_infrastructure, deployment_id, options})
  end
  
  @doc """
  Deploys an Automata system to the provisioned infrastructure.
  
  ## Parameters
  - deployment_id: ID of the deployment
  - options: Deployment options
  
  ## Returns
  - `{:ok, deployment_info}` if successful
  - `{:error, reason}` if failed
  """
  @spec deploy_system(deployment_id(), map()) :: {:ok, map()} | {:error, term()}
  def deploy_system(deployment_id, options \\ %{}) do
    GenServer.call(__MODULE__, {:deploy_system, deployment_id, options})
  end
  
  @doc """
  Gets the status of a deployment.
  
  ## Parameters
  - deployment_id: ID of the deployment
  
  ## Returns
  - `{:ok, status}` if successful
  - `{:error, reason}` if failed
  """
  @spec deployment_status(deployment_id()) :: {:ok, map()} | {:error, term()}
  def deployment_status(deployment_id) do
    GenServer.call(__MODULE__, {:deployment_status, deployment_id})
  end
  
  @doc """
  Scales a deployment up or down.
  
  ## Parameters
  - deployment_id: ID of the deployment
  - scaling_config: Configuration for scaling
  
  ## Returns
  - `{:ok, new_status}` if successful
  - `{:error, reason}` if failed
  """
  @spec scale_deployment(deployment_id(), map()) :: {:ok, map()} | {:error, term()}
  def scale_deployment(deployment_id, scaling_config) do
    GenServer.call(__MODULE__, {:scale_deployment, deployment_id, scaling_config})
  end
  
  # Server callbacks
  
  @impl true
  def init(:ok) do
    Logger.info("Starting Deployment Infrastructure")
    {:ok, %{initialized: true}}
  end
  
  @impl true
  def handle_call({:create_deployment, name, config}, _from, state) do
    case DeploymentManager.create_deployment(name, config) do
      {:ok, deployment_id} = result ->
        Logger.info("Created deployment: #{name} (#{deployment_id})")
        {:reply, result, state}
      
      {:error, _reason} = error ->
        {:reply, error, state}
    end
  end
  
  @impl true
  def handle_call({:list_deployments, status}, _from, state) do
    result = DeploymentManager.list_deployments(status)
    {:reply, result, state}
  end
  
  @impl true
  def handle_call({:provision_infrastructure, deployment_id, options}, _from, state) do
    case ResourceProvisioner.provision(deployment_id, options) do
      {:ok, resources} = result ->
        Logger.info("Provisioned infrastructure for deployment #{deployment_id}")
        {:reply, result, state}
      
      {:error, _reason} = error ->
        {:reply, error, state}
    end
  end
  
  @impl true
  def handle_call({:deploy_system, deployment_id, options}, _from, state) do
    case DeploymentManager.deploy(deployment_id, options) do
      {:ok, deployment_info} = result ->
        Logger.info("Deployed system for deployment #{deployment_id}")
        {:reply, result, state}
      
      {:error, _reason} = error ->
        {:reply, error, state}
    end
  end
  
  @impl true
  def handle_call({:deployment_status, deployment_id}, _from, state) do
    result = DeploymentManager.get_status(deployment_id)
    {:reply, result, state}
  end
  
  @impl true
  def handle_call({:scale_deployment, deployment_id, scaling_config}, _from, state) do
    case DeploymentManager.scale(deployment_id, scaling_config) do
      {:ok, new_status} = result ->
        Logger.info("Scaled deployment #{deployment_id}")
        {:reply, result, state}
      
      {:error, _reason} = error ->
        {:reply, error, state}
    end
  end
end

# Component implementations

defmodule Automata.IntegrationDeployment.DeploymentInfrastructure.DeploymentManager do
  @moduledoc """
  Manager for deployments in the Deployment Infrastructure component.
  
  Responsible for creating, configuring, and managing deployments of Automata systems.
  """
  
  use GenServer
  require Logger
  
  alias Automata.IntegrationDeployment.DeploymentInfrastructure.ConfigManager
  
  @type deployment_id :: binary()
  
  # Client API
  
  @doc """
  Starts the Deployment Manager.
  """
  def start_link(_opts) do
    GenServer.start_link(__MODULE__, :ok, name: __MODULE__)
  end
  
  @doc """
  Creates a new deployment.
  
  ## Parameters
  - name: Name of the deployment
  - config: Deployment configuration
  
  ## Returns
  - `{:ok, deployment_id}` if successful
  - `{:error, reason}` if failed
  """
  @spec create_deployment(binary(), map()) :: {:ok, deployment_id()} | {:error, term()}
  def create_deployment(name, config) do
    GenServer.call(__MODULE__, {:create_deployment, name, config})
  end
  
  @doc """
  Lists all deployments.
  
  ## Parameters
  - status: Optional status to filter by
  
  ## Returns
  - `{:ok, deployments}` list of deployments
  """
  @spec list_deployments(atom() | nil) :: {:ok, list(map())}
  def list_deployments(status \\ nil) do
    GenServer.call(__MODULE__, {:list_deployments, status})
  end
  
  @doc """
  Gets the status of a deployment.
  
  ## Parameters
  - deployment_id: ID of the deployment
  
  ## Returns
  - `{:ok, status}` if successful
  - `{:error, reason}` if failed
  """
  @spec get_status(deployment_id()) :: {:ok, map()} | {:error, term()}
  def get_status(deployment_id) do
    GenServer.call(__MODULE__, {:get_status, deployment_id})
  end
  
  @doc """
  Deploys a system to the provisioned infrastructure.
  
  ## Parameters
  - deployment_id: ID of the deployment
  - options: Deployment options
  
  ## Returns
  - `{:ok, deployment_info}` if successful
  - `{:error, reason}` if failed
  """
  @spec deploy(deployment_id(), map()) :: {:ok, map()} | {:error, term()}
  def deploy(deployment_id, options) do
    GenServer.call(__MODULE__, {:deploy, deployment_id, options})
  end
  
  @doc """
  Scales a deployment.
  
  ## Parameters
  - deployment_id: ID of the deployment
  - scaling_config: Configuration for scaling
  
  ## Returns
  - `{:ok, new_status}` if successful
  - `{:error, reason}` if failed
  """
  @spec scale(deployment_id(), map()) :: {:ok, map()} | {:error, term()}
  def scale(deployment_id, scaling_config) do
    GenServer.call(__MODULE__, {:scale, deployment_id, scaling_config})
  end
  
  # Server callbacks
  
  @impl true
  def init(:ok) do
    Logger.info("Starting Deployment Manager")
    
    # Initialize with empty state
    initial_state = %{
      deployments: %{},
      next_id: 1
    }
    
    {:ok, initial_state}
  end
  
  @impl true
  def handle_call({:create_deployment, name, config}, _from, state) do
    # Validate config
    with :ok <- validate_deployment_config(config) do
      # Generate deployment ID
      deployment_id = "deployment_#{state.next_id}"
      
      # Create deployment record
      timestamp = DateTime.utc_now()
      deployment = %{
        id: deployment_id,
        name: name,
        environment: Map.get(config, :environment, :development),
        infrastructure: Map.get(config, :infrastructure, %{}),
        scale: Map.get(config, :scale, %{nodes: 1, replicas: 1}),
        resources: Map.get(config, :resources, %{}),
        created_at: timestamp,
        updated_at: timestamp,
        status: :created,
        provisioned: false,
        deployed: false
      }
      
      # Create configuration for the deployment
      {:ok, _config_id} = ConfigManager.create_config(deployment_id, config)
      
      # Update state
      updated_state = %{
        state |
        deployments: Map.put(state.deployments, deployment_id, deployment),
        next_id: state.next_id + 1
      }
      
      {:reply, {:ok, deployment_id}, updated_state}
    else
      {:error, reason} = error ->
        Logger.error("Failed to create deployment: #{reason}")
        {:reply, error, state}
    end
  end
  
  @impl true
  def handle_call({:list_deployments, nil}, _from, state) do
    # Return all deployments
    deployments = Map.values(state.deployments)
    |> Enum.sort_by(& &1.created_at, DateTime)
    
    {:reply, {:ok, deployments}, state}
  end
  
  @impl true
  def handle_call({:list_deployments, status}, _from, state) do
    # Return deployments with the specified status
    deployments = Map.values(state.deployments)
    |> Enum.filter(& &1.status == status)
    |> Enum.sort_by(& &1.created_at, DateTime)
    
    {:reply, {:ok, deployments}, state}
  end
  
  @impl true
  def handle_call({:get_status, deployment_id}, _from, state) do
    case Map.fetch(state.deployments, deployment_id) do
      {:ok, deployment} ->
        status = %{
          id: deployment.id,
          name: deployment.name,
          status: deployment.status,
          provisioned: deployment.provisioned,
          deployed: deployment.deployed,
          updated_at: deployment.updated_at
        }
        
        {:reply, {:ok, status}, state}
      
      :error ->
        {:reply, {:error, :deployment_not_found}, state}
    end
  end
  
  @impl true
  def handle_call({:deploy, deployment_id, options}, _from, state) do
    case Map.fetch(state.deployments, deployment_id) do
      {:ok, deployment} ->
        if deployment.provisioned do
          # Update deployment status
          updated_deployment = %{
            deployment |
            status: :deploying,
            updated_at: DateTime.utc_now()
          }
          
          # Update state
          updated_state = %{
            state |
            deployments: Map.put(state.deployments, deployment_id, updated_deployment)
          }
          
          # In a real implementation, this would start the deployment process
          
          # Simulate deployment completion
          Process.send_after(self(), {:deployment_completed, deployment_id}, 1000)
          
          {:reply, {:ok, updated_deployment}, updated_state}
        else
          {:reply, {:error, :infrastructure_not_provisioned}, state}
        end
      
      :error ->
        {:reply, {:error, :deployment_not_found}, state}
    end
  end
  
  @impl true
  def handle_call({:scale, deployment_id, scaling_config}, _from, state) do
    case Map.fetch(state.deployments, deployment_id) do
      {:ok, deployment} ->
        if deployment.deployed do
          # Update deployment with new scaling configuration
          updated_deployment = %{
            deployment |
            scale: Map.merge(deployment.scale, scaling_config),
            status: :scaling,
            updated_at: DateTime.utc_now()
          }
          
          # Update state
          updated_state = %{
            state |
            deployments: Map.put(state.deployments, deployment_id, updated_deployment)
          }
          
          # In a real implementation, this would trigger the scaling process
          
          # Simulate scaling completion
          Process.send_after(self(), {:scaling_completed, deployment_id}, 1000)
          
          {:reply, {:ok, updated_deployment}, updated_state}
        else
          {:reply, {:error, :system_not_deployed}, state}
        end
      
      :error ->
        {:reply, {:error, :deployment_not_found}, state}
    end
  end
  
  @impl true
  def handle_info({:deployment_completed, deployment_id}, state) do
    case Map.fetch(state.deployments, deployment_id) do
      {:ok, deployment} ->
        # Update deployment status
        updated_deployment = %{
          deployment |
          status: :running,
          deployed: true,
          updated_at: DateTime.utc_now()
        }
        
        # Update state
        updated_state = %{
          state |
          deployments: Map.put(state.deployments, deployment_id, updated_deployment)
        }
        
        Logger.info("Deployment completed for #{deployment_id}")
        {:noreply, updated_state}
      
      :error ->
        {:noreply, state}
    end
  end
  
  @impl true
  def handle_info({:scaling_completed, deployment_id}, state) do
    case Map.fetch(state.deployments, deployment_id) do
      {:ok, deployment} ->
        # Update deployment status
        updated_deployment = %{
          deployment |
          status: :running,
          updated_at: DateTime.utc_now()
        }
        
        # Update state
        updated_state = %{
          state |
          deployments: Map.put(state.deployments, deployment_id, updated_deployment)
        }
        
        Logger.info("Scaling completed for #{deployment_id}")
        {:noreply, updated_state}
      
      :error ->
        {:noreply, state}
    end
  end
  
  # Helper functions
  
  defp validate_deployment_config(config) do
    # Validate required fields
    required_fields = [:environment, :infrastructure]
    
    missing_fields = Enum.filter(required_fields, fn field -> 
      !Map.has_key?(config, field) || is_nil(Map.get(config, field))
    end)
    
    if Enum.empty?(missing_fields) do
      # Validate environment
      if config.environment in [:development, :staging, :production] do
        :ok
      else
        {:error, "Invalid environment: #{config.environment}"}
      end
    else
      {:error, "Missing required fields: #{Enum.join(missing_fields, ", ")}"}
    end
  end
end

defmodule Automata.IntegrationDeployment.DeploymentInfrastructure.ResourceProvisioner do
  @moduledoc """
  Provisioner for infrastructure resources in the Deployment Infrastructure component.
  
  Responsible for provisioning infrastructure resources required for deployments.
  """
  
  use GenServer
  require Logger
  
  alias Automata.IntegrationDeployment.DeploymentInfrastructure.DeploymentManager
  
  @type deployment_id :: binary()
  
  # Client API
  
  @doc """
  Starts the Resource Provisioner.
  """
  def start_link(_opts) do
    GenServer.start_link(__MODULE__, :ok, name: __MODULE__)
  end
  
  @doc """
  Provisions infrastructure resources for a deployment.
  
  ## Parameters
  - deployment_id: ID of the deployment
  - options: Provisioning options
  
  ## Returns
  - `{:ok, resources}` if successful
  - `{:error, reason}` if failed
  """
  @spec provision(deployment_id(), map()) :: {:ok, map()} | {:error, term()}
  def provision(deployment_id, options) do
    GenServer.call(__MODULE__, {:provision, deployment_id, options})
  end
  
  # Server callbacks
  
  @impl true
  def init(:ok) do
    Logger.info("Starting Resource Provisioner")
    
    # Initialize with empty state
    initial_state = %{
      provisioned_resources: %{}
    }
    
    {:ok, initial_state}
  end
  
  @impl true
  def handle_call({:provision, deployment_id, options}, _from, state) do
    # Get deployment information
    case DeploymentManager.get_status(deployment_id) do
      {:ok, deployment} ->
        # In a real implementation, this would provision actual infrastructure resources
        # based on the deployment configuration and options
        
        # Simulate provisioning
        resources = %{
          nodes: Map.get(options, :nodes, 1),
          storage: Map.get(options, :storage, "10GB"),
          network: %{
            vpc: "vpc-#{:rand.uniform(10000)}",
            subnet: "subnet-#{:rand.uniform(10000)}"
          },
          timestamp: DateTime.utc_now()
        }
        
        # Update state
        updated_state = %{
          state |
          provisioned_resources: Map.put(state.provisioned_resources, deployment_id, resources)
        }
        
        # Update deployment status
        Process.send_after(
          Process.whereis(DeploymentManager), 
          {:provisioning_completed, deployment_id, resources}, 
          1000
        )
        
        {:reply, {:ok, resources}, updated_state}
      
      {:error, _reason} = error ->
        {:reply, error, state}
    end
  end
end

defmodule Automata.IntegrationDeployment.DeploymentInfrastructure.ConfigManager do
  @moduledoc """
  Manager for deployment configurations in the Deployment Infrastructure component.
  
  Responsible for creating and managing configuration files and settings for deployments.
  """
  
  use GenServer
  require Logger
  
  @type config_id :: binary()
  @type deployment_id :: binary()
  
  # Client API
  
  @doc """
  Starts the Config Manager.
  """
  def start_link(_opts) do
    GenServer.start_link(__MODULE__, :ok, name: __MODULE__)
  end
  
  @doc """
  Creates a new configuration for a deployment.
  
  ## Parameters
  - deployment_id: ID of the deployment
  - config: Configuration settings
  
  ## Returns
  - `{:ok, config_id}` if successful
  - `{:error, reason}` if failed
  """
  @spec create_config(deployment_id(), map()) :: {:ok, config_id()} | {:error, term()}
  def create_config(deployment_id, config) do
    GenServer.call(__MODULE__, {:create_config, deployment_id, config})
  end
  
  # Server callbacks
  
  @impl true
  def init(:ok) do
    Logger.info("Starting Config Manager")
    
    # Initialize with empty state
    initial_state = %{
      configs: %{},
      next_id: 1
    }
    
    {:ok, initial_state}
  end
  
  @impl true
  def handle_call({:create_config, deployment_id, config}, _from, state) do
    # Generate config ID
    config_id = "config_#{state.next_id}"
    
    # Create config record
    timestamp = DateTime.utc_now()
    config_record = %{
      id: config_id,
      deployment_id: deployment_id,
      settings: config,
      created_at: timestamp,
      updated_at: timestamp
    }
    
    # Update state
    updated_state = %{
      state |
      configs: Map.put(state.configs, config_id, config_record),
      next_id: state.next_id + 1
    }
    
    # In a real implementation, this would also generate configuration files
    
    {:reply, {:ok, config_id}, updated_state}
  end
end

defmodule Automata.IntegrationDeployment.DeploymentInfrastructure.MonitoringAgent do
  @moduledoc """
  Agent for monitoring deployments in the Deployment Infrastructure component.
  
  Responsible for collecting metrics and monitoring the health of deployments.
  """
  
  use GenServer
  require Logger
  
  @type deployment_id :: binary()
  
  # Client API
  
  @doc """
  Starts the Monitoring Agent.
  """
  def start_link(_opts) do
    GenServer.start_link(__MODULE__, :ok, name: __MODULE__)
  end
  
  @doc """
  Gets monitoring data for a deployment.
  
  ## Parameters
  - deployment_id: ID of the deployment
  - metrics: List of metrics to collect
  
  ## Returns
  - `{:ok, monitoring_data}` if successful
  - `{:error, reason}` if failed
  """
  @spec get_monitoring_data(deployment_id(), list()) :: {:ok, map()} | {:error, term()}
  def get_monitoring_data(deployment_id, metrics \\ []) do
    GenServer.call(__MODULE__, {:get_monitoring_data, deployment_id, metrics})
  end
  
  # Server callbacks
  
  @impl true
  def init(:ok) do
    Logger.info("Starting Monitoring Agent")
    
    # Initialize with empty state
    initial_state = %{
      metrics: %{}
    }
    
    # Start periodic metrics collection
    schedule_metrics_collection()
    
    {:ok, initial_state}
  end
  
  @impl true
  def handle_call({:get_monitoring_data, deployment_id, metrics}, _from, state) do
    # Get metrics for the deployment
    deployment_metrics = Map.get(state.metrics, deployment_id, %{})
    
    if Enum.empty?(metrics) do
      # Return all metrics
      {:reply, {:ok, deployment_metrics}, state}
    else
      # Filter to requested metrics
      filtered_metrics = Map.take(deployment_metrics, metrics)
      {:reply, {:ok, filtered_metrics}, state}
    end
  end
  
  @impl true
  def handle_info(:collect_metrics, state) do
    # In a real implementation, this would collect actual metrics from deployments
    
    # Schedule next collection
    schedule_metrics_collection()
    
    {:noreply, state}
  end
  
  # Helper functions
  
  defp schedule_metrics_collection do
    # Collect metrics every minute
    Process.send_after(self(), :collect_metrics, 60 * 1000)
  end
end