raxol

defmodule Raxol.Cloud.Integrations do
  @moduledoc """
  Cloud integration utilities for Raxol applications.

  This module provides integration utilities for connecting various cloud services
  with Raxol applications, focusing on edge computing, monitoring, and service discovery.
  It serves as a central coordination point for cloud-related features.

  Features:
  * Edge-to-cloud integration helpers
  * Centralized configuration management
  * Service discovery and registration
  * Multi-cloud provider support
  * Deployment and scaling utilities
  """

  alias Raxol.Cloud.{EdgeComputing, Monitoring}

  @doc """
  Initializes all cloud integrations with the provided configuration.

  ## Options

  * `:edge` - Options for edge computing (passed to EdgeComputing.init/1)
  * `:monitoring` - Options for monitoring system (passed to Monitoring.init/1)
  * `:providers` - List of cloud providers to enable [:aws, :azure, :gcp, :custom]
  * `:service_discovery` - Service discovery configuration
  * `:deployment` - Deployment and scaling configuration

  ## Examples

      iex> init(
      ...>   edge: [mode: :auto, sync_interval: 30000],
      ...>   monitoring: [backends: [:prometheus], active: true],
      ...>   providers: [:aws]
      ...> )
      :ok
  """
  def init(opts \\ []) do
    opts = if is_map(opts), do: Enum.into(opts, []), else: opts
    # Extract configuration for each component
    edge_opts = Keyword.get(opts, :edge, [])
    monitoring_opts = Keyword.get(opts, :monitoring, [])
    providers = Keyword.get(opts, :providers, [])

    # Initialize components
    EdgeComputing.init(edge_opts)
    Monitoring.init(monitoring_opts)

    # Initialize cloud providers
    initialize_providers(providers)

    # Setup integration between components
    setup_edge_monitoring_integration()

    :ok
  end

  @doc """
  Returns the current status of all cloud integrations.

  ## Examples

      iex> status()
      %{
        edge: %{mode: :auto, connected: true, ...},
        monitoring: %{active: true, ...},
        providers: %{aws: :connected, ...}
      }
  """
  def status() do
    %{
      edge: EdgeComputing.status(),
      monitoring: Monitoring.status(),
      providers: get_providers_status()
    }
  end

  @doc """
  Executes a function in the optimal location (edge or cloud) based on current conditions.

  This is a wrapper around EdgeComputing.execute/2 that adds monitoring.

  ## Examples

      iex> execute(fn -> perform_calculation(data) end, priority: :speed)
      {:ok, result}
  """
  def execute(fun, opts \\ []) do
    opts = if is_map(opts), do: Enum.into(opts, []), else: opts
    start_time = :os.system_time(:millisecond)

    result =
      try do
        EdgeComputing.execute(fun, opts)
      rescue
        error ->
          Monitoring.record_error(error,
            context: %{
              operation: :execute,
              options: opts
            }
          )

          {:error, error}
      end

    end_time = :os.system_time(:millisecond)
    execution_time = end_time - start_time

    # Record metrics
    record_execution_metrics(result, execution_time, opts)

    result
  end

  @doc """
  Deploys an application component to the appropriate environment based on configuration.

  ## Options

  * `:component` - Name of the component to deploy
  * `:version` - Version to deploy
  * `:environment` - Target environment (:production, :staging, :development)
  * `:strategy` - Deployment strategy (:blue_green, :canary, :rolling)

  ## Examples

      iex> deploy(
      ...>   component: :api_service,
      ...>   version: "1.2.3",
      ...>   environment: :production,
      ...>   strategy: :blue_green
      ...> )
      {:ok, %{deployment_id: "dep-12345", status: :in_progress}}
  """
  def deploy(opts) do
    opts = if is_map(opts), do: Enum.into(opts, []), else: opts
    required = [:component, :version, :environment]

    case validate_required_options(opts, required) do
      :ok ->
        # This would integrate with actual deployment systems
        # For now, it's just a placeholder
        deployment_id =
          "dep-#{:erlang.system_time(:seconds)}-#{:rand.uniform(10000)}"

        # Record the deployment event
        Monitoring.record_metric("deployment", 1,
          tags: [
            "component:#{opts[:component]}",
            "version:#{opts[:version]}",
            "environment:#{opts[:environment]}",
            "strategy:#{opts[:strategy] || :rolling}"
          ]
        )

        {:ok,
         %{
           deployment_id: deployment_id,
           status: :in_progress,
           component: opts[:component],
           version: opts[:version],
           environment: opts[:environment],
           timestamp: DateTime.utc_now()
         }}

      {:error, missing} ->
        {:error, {:missing_required_options, missing}}
    end
  end

  @doc """
  Discovers services available in the current environment.

  ## Options

  * `:type` - Type of service to discover (:all, or a specific service type)
  * `:provider` - Cloud provider to query (:all, or a specific provider)
  * `:region` - Region to search in

  ## Examples

      iex> discover_services(type: :database)
      {:ok, [
        %{name: "main-db", type: :database, endpoint: "main-db.example.com:5432"},
        %{name: "analytics-db", type: :database, endpoint: "analytics-db.example.com:5432"}
      ]}
  """
  def discover_services(opts \\ []) do
    opts = if is_map(opts), do: Enum.into(opts, []), else: opts
    type = Keyword.get(opts, :type, :all)
    provider = Keyword.get(opts, :provider, :all)
    region = Keyword.get(opts, :region)

    # This would integrate with actual service discovery systems
    # For now, it returns a mock response
    services = [
      %{
        name: "main-db",
        type: :database,
        provider: :aws,
        region: "us-west-2",
        endpoint: "main-db.example.com:5432",
        status: :healthy
      },
      %{
        name: "analytics-db",
        type: :database,
        provider: :aws,
        region: "us-west-2",
        endpoint: "analytics-db.example.com:5432",
        status: :healthy
      },
      %{
        name: "cache",
        type: :cache,
        provider: :aws,
        region: "us-west-2",
        endpoint: "cache.example.com:6379",
        status: :healthy
      },
      %{
        name: "auth-service",
        type: :service,
        provider: :gcp,
        region: "us-central1",
        endpoint: "auth.example.com:8080",
        status: :healthy
      }
    ]

    # Filter services based on options
    filtered_services =
      services
      |> Enum.filter(fn service ->
        (type == :all || service.type == type) &&
          (provider == :all || service.provider == provider) &&
          (region == nil || service.region == region)
      end)

    {:ok, filtered_services}
  end

  @doc """
  Registers the current application as a service in the service discovery system.

  ## Options

  * `:name` - Service name (required)
  * `:type` - Service type (required)
  * `:endpoint` - Service endpoint (required)
  * `:metadata` - Additional metadata about the service
  * `:health_check_path` - Path for health checks

  ## Examples

      iex> register_service(
      ...>   name: "user-api",
      ...>   type: :api,
      ...>   endpoint: "user-api.example.com:8080",
      ...>   health_check_path: "/health"
      ...> )
      {:ok, %{registration_id: "reg-12345", status: :registered}}
  """
  def register_service(opts) do
    opts = if is_map(opts), do: Enum.into(opts, []), else: opts
    required = [:name, :type, :endpoint]

    case validate_required_options(opts, required) do
      :ok ->
        # This would integrate with actual service discovery systems
        # For now, it's just a placeholder
        registration_id =
          "reg-#{:erlang.system_time(:seconds)}-#{:rand.uniform(10000)}"

        {:ok,
         %{
           registration_id: registration_id,
           status: :registered,
           name: opts[:name],
           type: opts[:type],
           endpoint: opts[:endpoint],
           timestamp: DateTime.utc_now()
         }}

      {:error, missing} ->
        {:error, {:missing_required_options, missing}}
    end
  end

  @doc """
  Scales a service based on current metrics and conditions.

  ## Options

  * `:service` - Service name to scale (required)
  * `:min` - Minimum number of instances
  * `:max` - Maximum number of instances
  * `:desired` - Desired number of instances (if specified, overrides automatic scaling)
  * `:metrics` - Metrics to use for scaling decisions

  ## Examples

      iex> scale(
      ...>   service: "api-server",
      ...>   min: 2,
      ...>   max: 10,
      ...>   metrics: [
      ...>     %{name: "cpu", target: 70},
      ...>     %{name: "requests", target: 1000}
      ...>   ]
      ...> )
      {:ok, %{service: "api-server", current: 2, target: 4, status: :scaling}}
  """
  def scale(opts) do
    opts = if is_map(opts), do: Enum.into(opts, []), else: opts
    required = [:service]

    case validate_required_options(opts, required) do
      :ok ->
        min = Keyword.get(opts, :min, 1)
        max = Keyword.get(opts, :max, 10)
        desired = Keyword.get(opts, :desired)

        # If desired is specified, use that value
        target =
          if desired do
            # Ensure desired is within min/max
            desired |> max(min) |> min(max)
          else
            # This would normally calculate based on metrics
            # For now, just generate a number between min and max
            :rand.uniform(max - min + 1) + min - 1
          end

        # Generate a mock current value
        current = :rand.uniform(max - min + 1) + min - 1

        # Record scaling event
        Monitoring.record_metric("scaling", 1,
          tags: [
            "service:#{opts[:service]}",
            "min:#{min}",
            "max:#{max}",
            "target:#{target}",
            "current:#{current}"
          ]
        )

        status =
          cond do
            target > current -> :scaling_up
            target < current -> :scaling_down
            true -> :no_change
          end

        {:ok,
         %{
           service: opts[:service],
           current: current,
           target: target,
           min: min,
           max: max,
           status: status,
           timestamp: DateTime.utc_now()
         }}

      {:error, missing} ->
        {:error, {:missing_required_options, missing}}
    end
  end

  @doc """
  Gets a connection to a cloud service with the specified parameters.

  ## Options

  * `:service` - Service name or type to connect to (required)
  * `:provider` - Cloud provider to use (:aws, :azure, :gcp, or :custom)
  * `:region` - Region to connect to
  * `:config` - Additional configuration for the connection

  ## Examples

      iex> get_service_connection(
      ...>   service: :storage,
      ...>   provider: :aws,
      ...>   region: "us-west-2"
      ...> )
      {:ok, %{
      ...>   client: client,
      ...>   endpoint: "s3.us-west-2.amazonaws.com",
      ...>   service: :storage,
      ...>   provider: :aws
      ...> }}
  """
  def get_service_connection(opts) do
    required = [:service]

    case validate_required_options(opts, required) do
      :ok ->
        service = opts[:service]
        provider = Keyword.get(opts, :provider, :aws)
        region = Keyword.get(opts, :region, "us-west-2")

        # This would connect to actual cloud services
        # For now, it returns a mock client
        client = %{mock: true, connected: true}

        # Record connection attempt
        Monitoring.record_metric("service_connection", 1,
          tags: [
            "service:#{service}",
            "provider:#{provider}",
            "region:#{region}",
            "status:success"
          ]
        )

        {:ok,
         %{
           client: client,
           endpoint: get_mock_endpoint(service, provider, region),
           service: service,
           provider: provider,
           region: region,
           timestamp: DateTime.utc_now()
         }}

      {:error, missing} ->
        {:error, {:missing_required_options, missing}}
    end
  end

  # Private functions

  defp validate_required_options(opts, required) do
    missing = Enum.filter(required, fn opt -> !Keyword.has_key?(opts, opt) end)

    if Enum.empty?(missing) do
      :ok
    else
      {:error, missing}
    end
  end

  defp initialize_providers(providers) do
    # This would initialize connections to cloud providers
    # For now, it's just a placeholder
    Enum.each(providers, fn provider ->
      case provider do
        :aws -> init_aws()
        :azure -> init_azure()
        :gcp -> init_gcp()
        :custom -> init_custom_provider()
        _ -> :ok
      end
    end)
  end

  defp init_aws() do
    # This would initialize AWS SDK
    :ok
  end

  defp init_azure() do
    # This would initialize Azure SDK
    :ok
  end

  defp init_gcp() do
    # This would initialize GCP SDK
    :ok
  end

  defp init_custom_provider() do
    # This would initialize a custom provider
    :ok
  end

  defp get_providers_status() do
    # This would check the status of each provider
    # For now, it returns mock values
    %{
      aws: :connected,
      azure: :disconnected,
      gcp: :connected,
      custom: :unknown
    }
  end

  defp setup_edge_monitoring_integration() do
    # This integrates EdgeComputing and Monitoring
    # Register metrics handler for edge computing events

    # Report EdgeComputing status in monitoring
    Monitoring.record_metric("edge.status", 1,
      tags: [
        "mode:#{EdgeComputing.status().mode}",
        "connected:#{EdgeComputing.status().cloud_status == :connected}"
      ]
    )

    # In a real implementation, we would set up event handlers
    # to keep these systems integrated
    :ok
  end

  defp record_execution_metrics(result, execution_time, opts) do
    # Record execution metrics
    tags = []

    # Add location tag if available
    location_tag =
      case result do
        {:ok, {location, _}} when location in [:edge, :cloud] ->
          ["location:#{location}"]

        _ ->
          ["location:unknown"]
      end

    # Add priority tag if available
    priority_tag =
      case Keyword.get(opts, :priority) do
        nil -> []
        priority -> ["priority:#{priority}"]
      end

    # Add success/failure tag
    status_tag =
      case result do
        {:ok, _} -> ["status:success"]
        {:error, _} -> ["status:failure"]
      end

    # Combine all tags
    tags = tags ++ location_tag ++ priority_tag ++ status_tag

    # Record metrics
    Monitoring.record_metric("edge.execution_time", execution_time, tags: tags)
    Monitoring.record_metric("edge.execution_count", 1, tags: tags)
  end

  defp get_mock_endpoint(service, provider, region) do
    case {provider, service} do
      {:aws, :storage} -> "s3.#{region}.amazonaws.com"
      {:aws, :database} -> "rds.#{region}.amazonaws.com"
      {:aws, :compute} -> "ec2.#{region}.amazonaws.com"
      {:azure, :storage} -> "#{region}.blob.core.windows.net"
      {:azure, :database} -> "#{region}.database.windows.net"
      {:azure, :compute} -> "#{region}.compute.azure.com"
      {:gcp, :storage} -> "storage.googleapis.com/#{region}"
      {:gcp, :database} -> "#{region}.database.googleapis.com"
      {:gcp, :compute} -> "compute.googleapis.com/#{region}"
      {_, _} -> "#{service}.#{provider}.example.com"
    end
  end
end