defmodule Foundation.Perimeter.Coupling do
  @moduledoc """
  Zone 3 - Coupling Zones for Foundation high-performance internal communication.
  Provides minimal validation overhead with maximum performance optimization.
  """
  
  alias Foundation.Perimeter.{ValidationService, ContractRegistry, PerformanceMonitor}
  alias Foundation.Telemetry
  
  @doc """
  Defines a coupling zone contract for high-performance internal communication.
  
  ## Example
  
      coupling_zone :hot_path_data do
        field :operation_id, :integer, required: true
        field :data_chunk, :binary, required: true
        field :sequence_number, :integer, required: true, range: 0..999999
        field :checksum, :integer, required: false
        
        performance_config do
          hot_path true
          validation_mode :minimal
          optimization_level :maximum
          load_threshold 1000  # ops/second
        end
      end
  """
  defmacro coupling_zone(name, do: body) do
    quote do
      @contract_name unquote(name)
      @contract_zone :coupling
      @fields []
      @performance_config %{}
      
      unquote(body)
      
      Foundation.Perimeter.Coupling.__compile_coupling_zone__(@contract_name, @fields, @contract_zone, @performance_config)
    end
  end
  
  @doc """
  Defines a field in a coupling zone contract with minimal validation constraints.
  """
  defmacro field(name, type, opts \\ []) do
    quote do
      @fields [{unquote(name), unquote(type), unquote(opts)} | @fields]
    end
  end
  
  @doc """
  Defines performance-specific configuration for coupling zone optimization.
  """
  defmacro performance_config(do: body) do
    quote do
      unquote(body)
    end
  end
  
  @doc """
  Marks this coupling zone as a hot path for maximum optimization.
  """
  defmacro hot_path(enabled) do
    quote do
      @performance_config Map.put(@performance_config, :hot_path, unquote(enabled))
    end
  end
  
  @doc """
  Sets the validation mode for this coupling zone.
  """
  defmacro validation_mode(mode) do
    quote do
      @performance_config Map.put(@performance_config, :validation_mode, unquote(mode))
    end
  end
  
  @doc """
  Sets the optimization level for this coupling zone.
  """
  defmacro optimization_level(level) do
    quote do
      @performance_config Map.put(@performance_config, :optimization_level, unquote(level))
    end
  end
  
  @doc """
  Sets the load threshold for adaptive optimization.
  """
  defmacro load_threshold(threshold) do
    quote do
      @performance_config Map.put(@performance_config, :load_threshold, unquote(threshold))
    end
  end
  
  @doc false
  def __compile_coupling_zone__(name, fields, zone, config) do
    compile_coupling_zone_functions(name, fields, zone, config)
  end
end

defmodule Foundation.Perimeter.Coupling.Compiler do
  @moduledoc false
  
  def compile_coupling_zone_functions(zone_name, fields, zone, config) do
    validation_function_name = :"validate_#{zone_name}"
    hot_path_function_name = :"validate_#{zone_name}_hot_path"
    schema_function_name = :"#{zone_name}_schema"
    performance_function_name = :"#{zone_name}_performance_check"
    
    is_hot_path = Map.get(config, :hot_path, false)
    optimization_level = Map.get(config, :optimization_level, :standard)
    
    quote do
      @doc """
      Validates data against the #{unquote(zone_name)} coupling zone.
      Includes adaptive performance optimization based on system load.
      """
      def unquote(validation_function_name)(data, opts \\ []) when is_map(data) do
        start_time = System.monotonic_time(:microsecond)
        
        # Check if we should use hot path optimization
        case should_use_hot_path_optimization(unquote(zone_name), unquote(config)) do
          true ->
            unquote(hot_path_function_name)(data, start_time)
          
          false ->
            perform_standard_coupling_validation(data, unquote(fields), unquote(zone_name), 
                                               unquote(config), start_time)
        end
      end
      
      def unquote(validation_function_name)(data, _opts) do
        {:error, [Foundation.Perimeter.Error.type_error(:coupling_zone_input, data, :map)]}
      end
      
      @doc """
      Ultra-fast hot path validation for #{unquote(zone_name)}.
      Maximum performance with minimal safety checks.
      """
      def unquote(hot_path_function_name)(data, start_time) when is_map(data) do
        # Generate optimized hot path validation
        unquote(generate_hot_path_validation(fields, zone_name, config))
        
        validation_time = System.monotonic_time(:microsecond) - start_time
        
        Foundation.Telemetry.emit([:foundation, :perimeter, :coupling, :hot_path_validation], %{
          duration: validation_time
        }, %{
          zone: unquote(zone_name),
          optimization_level: unquote(optimization_level)
        })
        
        {:ok, data}  # Hot path returns data with minimal validation
      end
      
      @doc """
      Returns the schema definition for #{unquote(zone_name)} coupling zone.
      """
      def unquote(schema_function_name)() do
        %{
          name: unquote(zone_name),
          zone: unquote(zone),
          fields: unquote(Macro.escape(fields)),
          performance_config: unquote(Macro.escape(config)),
          compiled_at: unquote(DateTime.utc_now()),
          module: __MODULE__
        }
      end
      
      @doc """
      Checks performance characteristics for #{unquote(zone_name)} coupling zone.
      """
      def unquote(performance_function_name)() do
        check_coupling_zone_performance(unquote(zone_name), unquote(config))
      end
      
      # Generate ultra-fast field validators for coupling zones
      unquote_splicing(generate_coupling_field_validators(fields, zone_name, config))
    end
  end
  
  defp should_use_hot_path_optimization(zone_name, config) do
    is_hot_path = Map.get(config, :hot_path, false)
    load_threshold = Map.get(config, :load_threshold, 1000)
    
    case is_hot_path do
      true ->
        # Check current system load for this zone
        current_load = Foundation.Perimeter.PerformanceMonitor.get_zone_load(zone_name)
        current_load > load_threshold
      
      false ->
        false
    end
  end
  
  defp generate_hot_path_validation(fields, zone_name, config) do
    validation_mode = Map.get(config, :validation_mode, :minimal)
    
    case validation_mode do
      :minimal ->
        # Only check required fields exist
        required_fields = Enum.filter(fields, fn {_name, _type, opts} -> 
          Keyword.get(opts, :required, false) 
        end)
        
        required_checks = Enum.map(required_fields, fn {field_name, _type, _opts} ->
          quote do
            case Map.get(data, unquote(field_name)) do
              nil -> 
                throw({:missing_required_field, unquote(field_name)})
              _ -> 
                :ok
            end
          end
        end)
        
        quote do
          try do
            unquote_splicing(required_checks)
          catch
            {:missing_required_field, field} ->
              validation_time = System.monotonic_time(:microsecond) - start_time
              
              Foundation.Telemetry.emit([:foundation, :perimeter, :coupling, :hot_path_validation_failed], %{
                duration: validation_time
              }, %{
                zone: unquote(zone_name),
                missing_field: field
              })
              
              {:error, [Foundation.Perimeter.Error.required_field_missing(
                :coupling, unquote(zone_name), field
              )]}
          end
        end
      
      :none ->
        # No validation - maximum performance
        quote do
          # No validation performed - trust the caller completely
        end
      
      _ ->
        # Fallback to standard validation
        quote do
          perform_standard_coupling_validation(data, unquote(Macro.escape(fields)), 
                                             unquote(zone_name), unquote(Macro.escape(config)), start_time)
        end
    end
  end
  
  defp perform_standard_coupling_validation(data, fields, zone_name, config, start_time) do
    validation_mode = Map.get(config, :validation_mode, :standard)
    
    case perform_coupling_field_validation(data, fields, zone_name, validation_mode) do
      {:ok, validated} = success ->
        validation_time = System.monotonic_time(:microsecond) - start_time
        
        Foundation.Telemetry.emit([:foundation, :perimeter, :coupling, :validation_success], %{
          duration: validation_time,
          fields_validated: length(fields)
        }, %{
          zone: zone_name,
          validation_mode: validation_mode
        })
        
        success
      
      {:error, errors} = failure ->
        validation_time = System.monotonic_time(:microsecond) - start_time
        
        Foundation.Telemetry.emit([:foundation, :perimeter, :coupling, :validation_failed], %{
          duration: validation_time,
          error_count: length(errors)
        }, %{
          zone: zone_name,
          validation_mode: validation_mode
        })
        
        failure
    end
  end
  
  defp perform_coupling_field_validation(data, fields, zone_name, validation_mode) do
    validated_fields = %{}
    errors = []
    
    {validated, errors} = Enum.reduce(fields, {validated_fields, errors}, fn 
      {field_name, field_type, field_opts}, {acc_validated, acc_errors} ->
        case validate_coupling_field(data, field_name, field_type, field_opts, zone_name, validation_mode) do
          {:ok, value} ->
            {Map.put(acc_validated, field_name, value), acc_errors}
          
          {:error, field_errors} when is_list(field_errors) ->
            {acc_validated, acc_errors ++ field_errors}
          
          {:error, field_error} ->
            {acc_validated, [field_error | acc_errors]}
        end
    end)
    
    case errors do
      [] -> {:ok, validated}
      _ -> {:error, Enum.reverse(errors)}
    end
  end
  
  defp validate_coupling_field(data, field_name, field_type, field_opts, zone_name, validation_mode) do
    required = Keyword.get(field_opts, :required, false)
    default = Keyword.get(field_opts, :default)
    
    case Map.get(data, field_name, Map.get(data, to_string(field_name))) do
      nil when required ->
        {:error, Foundation.Perimeter.Error.required_field_missing(
          :coupling, zone_name, field_name
        )}
      
      nil when not is_nil(default) ->
        validate_coupling_field_type(default, field_name, field_type, field_opts, zone_name, validation_mode)
      
      nil ->
        {:ok, nil}
      
      value ->
        validate_coupling_field_type(value, field_name, field_type, field_opts, zone_name, validation_mode)
    end
  end
  
  defp validate_coupling_field_type(value, field_name, field_type, field_opts, zone_name, validation_mode) do
    # Coupling zone validation is ultra-fast - minimal type checking
    case validate_coupling_base_type(value, field_type, field_name, zone_name, validation_mode) do
      {:ok, typed_value} ->
        # Only check critical constraints in coupling zones
        validate_coupling_critical_constraints(typed_value, field_opts, field_name, zone_name, validation_mode)
      
      error ->
        error
    end
  end
  
  # Ultra-fast type validation for coupling zones - trust but verify minimally
  defp validate_coupling_base_type(value, :integer, _field_name, _zone_name, _mode) when is_integer(value), do: {:ok, value}
  defp validate_coupling_base_type(value, :binary, _field_name, _zone_name, _mode) when is_binary(value), do: {:ok, value}
  defp validate_coupling_base_type(value, :atom, _field_name, _zone_name, _mode) when is_atom(value), do: {:ok, value}
  defp validate_coupling_base_type(value, :map, _field_name, _zone_name, _mode) when is_map(value), do: {:ok, value}
  defp validate_coupling_base_type(value, :list, _field_name, _zone_name, _mode) when is_list(value), do: {:ok, value}
  defp validate_coupling_base_type(value, :float, _field_name, _zone_name, _mode) when is_float(value), do: {:ok, value}
  defp validate_coupling_base_type(value, :number, _field_name, _zone_name, _mode) when is_number(value), do: {:ok, value}
  
  # Minimal type conversion for performance
  defp validate_coupling_base_type(value, :integer, field_name, zone_name, :standard) when is_binary(value) do
    case Integer.parse(value) do
      {int_val, ""} -> {:ok, int_val}
      _ -> {:error, Foundation.Perimeter.Error.type_error(:coupling, field_name, value, :integer)}
    end
  end
  
  # For minimal/none modes, trust the input completely
  defp validate_coupling_base_type(value, _expected_type, _field_name, _zone_name, mode) 
      when mode in [:minimal, :none] do
    {:ok, value}
  end
  
  # Fallback for standard mode
  defp validate_coupling_base_type(value, expected_type, field_name, zone_name, :standard) do
    {:error, Foundation.Perimeter.Error.type_error(:coupling, field_name, value, expected_type)}
  end
  
  defp validate_coupling_critical_constraints(value, field_opts, field_name, zone_name, validation_mode) do
    # Only check absolutely critical constraints for coupling zones
    critical_constraints = case validation_mode do
      :minimal -> [:required]  # Only required checks
      :none -> []  # No constraint checking
      _ -> [:required, :range]  # Limited constraint checking
    end
    
    Enum.reduce_while(field_opts, {:ok, value}, fn
      {:required, _}, acc -> {:cont, acc}
      {:default, _}, acc -> {:cont, acc}
      
      {:range, range}, {:ok, val} when is_number(val) and :range in critical_constraints ->
        validate_coupling_range_constraint(val, range, field_name, zone_name)
      
      {_constraint_name, _constraint_value}, {:ok, _val} ->
        {:cont, {:ok, value}}  # Skip non-critical constraints
    end)
  end
  
  defp validate_coupling_range_constraint(value, min..max, field_name, zone_name) do
    if value >= min and value <= max do
      {:cont, {:ok, value}}
    else
      {:halt, {:error, Foundation.Perimeter.Error.constraint_error(
        :coupling, field_name, value, :range, "must be between #{min} and #{max}"
      )}}
    end
  end
  
  defp check_coupling_zone_performance(zone_name, config) do
    current_load = Foundation.Perimeter.PerformanceMonitor.get_zone_load(zone_name)
    load_threshold = Map.get(config, :load_threshold, 1000)
    is_hot_path = Map.get(config, :hot_path, false)
    
    %{
      zone_name: zone_name,
      current_load: current_load,
      load_threshold: load_threshold,
      is_hot_path: is_hot_path,
      hot_path_active: current_load > load_threshold and is_hot_path,
      performance_level: determine_performance_level(current_load, load_threshold)
    }
  end
  
  defp determine_performance_level(current_load, threshold) do
    cond do
      current_load < threshold * 0.5 -> :normal
      current_load < threshold -> :elevated
      current_load < threshold * 2 -> :high
      true -> :critical
    end
  end
  
  defp generate_coupling_field_validators(fields, zone_name, config) do
    optimization_level = Map.get(config, :optimization_level, :standard)
    
    Enum.map(fields, fn {field_name, field_type, field_opts} ->
      validator_name = :"validate_#{zone_name}_#{field_name}"
      
      case optimization_level do
        :maximum ->
          # Generate ultra-fast inline validators
          quote do
            @compile {:inline, [{unquote(validator_name), 2}]}
            
            @doc """
            Ultra-fast validator for #{unquote(field_name)} field in #{unquote(zone_name)} coupling zone.
            """
            def unquote(validator_name)(value, _opts \\ []) do
              # Maximum optimization - minimal checks
              {:ok, value}
            end
          end
        
        _ ->
          # Standard optimized validators
          quote do
            @doc """
            Optimized validator for #{unquote(field_name)} field in #{unquote(zone_name)} coupling zone.
            """
            def unquote(validator_name)(value, opts \\ []) do
              validation_mode = Keyword.get(opts, :validation_mode, :standard)
              validate_coupling_field_type(value, unquote(field_name), unquote(field_type), 
                                          unquote(field_opts), unquote(zone_name), validation_mode)
            end
          end
      end
    end)
  end
end

defmodule Foundation.Perimeter.CouplingTest do
  use Foundation.UnifiedTestFoundation, :basic
  import Foundation.AsyncTestHelpers
  
  alias Foundation.Perimeter.Coupling.HotPathContracts
  alias Foundation.Perimeter.Error
  
  @moduletag :perimeter_testing
  @moduletag timeout: 5_000
  
  describe "Coupling zone validation" do
    test "validates hot path data with maximum performance" do
      hot_path_data = %{
        operation_id: 12345,
        data_chunk: <<1, 2, 3, 4, 5>>,
        sequence_number: 100,
        checksum: 567890
      }
      
      # Should emit hot path telemetry when load is high
      with_mock Foundation.Perimeter.PerformanceMonitor, [], [
        get_zone_load: fn(:hot_path_data) -> 2000 end  # Above threshold
      ] do
        
        assert_telemetry_event [:foundation, :perimeter, :coupling, :hot_path_validation],
          %{duration: duration} when duration >= 0 do
          assert {:ok, validated} = HotPathContracts.validate_hot_path_data(hot_path_data)
          
          # Hot path returns data as-is with minimal validation
          assert validated.operation_id == 12345
          assert validated.data_chunk == <<1, 2, 3, 4, 5>>
        end
      end
    end
    
    test "uses standard validation when load is below threshold" do
      hot_path_data = %{
        operation_id: 12345,
        data_chunk: <<1, 2, 3, 4, 5>>,
        sequence_number: 100
      }
      
      # Mock low load to force standard validation
      with_mock Foundation.Perimeter.PerformanceMonitor, [], [
        get_zone_load: fn(:hot_path_data) -> 500 end  # Below threshold
      ] do
        
        assert_telemetry_event [:foundation, :perimeter, :coupling, :validation_success],
          %{validation_mode: :minimal} do
          assert {:ok, validated} = HotPathContracts.validate_hot_path_data(hot_path_data)
          assert validated.operation_id == 12345
        end
      end
    end
    
    test "handles validation errors in coupling zones efficiently" do
      invalid_data = %{
        operation_id: "not-an-integer",
        data_chunk: 12345,  # Should be binary
        sequence_number: 1000000  # Out of range
      }
      
      with_mock Foundation.Perimeter.PerformanceMonitor, [], [
        get_zone_load: fn(:hot_path_data) -> 500 end  # Standard validation
      ] do
        
        assert_telemetry_event [:foundation, :perimeter, :coupling, :validation_failed],
          %{error_count: count} when count > 0 do
          assert {:error, errors} = HotPathContracts.validate_hot_path_data(invalid_data)
          
          assert is_list(errors)
          assert length(errors) > 0
        end
      end
    end
    
    test "hot path validation handles missing required fields" do
      incomplete_data = %{
        operation_id: 12345
        # Missing required fields: data_chunk, sequence_number
      }
      
      with_mock Foundation.Perimeter.PerformanceMonitor, [], [
        get_zone_load: fn(:hot_path_data) -> 2000 end  # Hot path mode
      ] do
        
        assert_telemetry_event [:foundation, :perimeter, :coupling, :hot_path_validation_failed],
          %{missing_field: field} when field in [:data_chunk, :sequence_number] do
          assert {:error, [error]} = HotPathContracts.validate_hot_path_data(incomplete_data)
          assert error.zone == :coupling
          assert error.field in [:data_chunk, :sequence_number]
        end
      end
    end
  end
  
  describe "Coupling zone performance" do
    test "meets extreme performance targets for hot path" do
      hot_path_data = %{
        operation_id: 12345,
        data_chunk: <<1, 2, 3, 4, 5>>,
        sequence_number: 100,
        checksum: 567890
      }
      
      with_mock Foundation.Perimeter.PerformanceMonitor, [], [
        get_zone_load: fn(:hot_path_data) -> 2000 end  # Hot path mode
      ] do
        
        # Measure hot path validation time
        {validation_time, {:ok, _validated}} = :timer.tc(fn ->
          HotPathContracts.validate_hot_path_data(hot_path_data)
        end)
        
        # Convert to milliseconds
        validation_ms = validation_time / 1000
        
        # Assert extreme performance target for coupling zones
        assert validation_ms < 1.0, "Coupling validation took #{validation_ms}ms, should be <1ms"
      end
    end
    
    test "hot path validation achieves sub-millisecond performance" do
      hot_path_data = %{
        operation_id: 12345,
        data_chunk: <<1, 2, 3, 4, 5>>,
        sequence_number: 100,
        checksum: 567890
      }
      
      with_mock Foundation.Perimeter.PerformanceMonitor, [], [
        get_zone_load: fn(:hot_path_data) -> 5000 end  # Very high load
      ] do
        
        # Measure hot path validation time
        {validation_time, {:ok, _validated}} = :timer.tc(fn ->
          HotPathContracts.validate_hot_path_data_hot_path(hot_path_data, System.monotonic_time(:microsecond))
        end)
        
        # Convert to milliseconds
        validation_ms = validation_time / 1000
        
        # Assert hot path performance target
        assert validation_ms < 0.1, "Hot path validation took #{validation_ms}ms, should be <0.1ms"
      end
    end
    
    test "handles high throughput efficiently" do
      hot_path_data = %{
        operation_id: 12345,
        data_chunk: <<1, 2, 3, 4, 5>>,
        sequence_number: 100
      }
      
      with_mock Foundation.Perimeter.PerformanceMonitor, [], [
        get_zone_load: fn(:hot_path_data) -> 2000 end
      ] do
        
        # Perform high-throughput validation
        validation_count = 1000
        
        {total_time, results} = :timer.tc(fn ->
          for _i <- 1..validation_count do
            HotPathContracts.validate_hot_path_data(hot_path_data)
          end
        end)
        
        # All should succeed
        for result <- results do
          assert {:ok, _validated} = result
        end
        
        # Calculate throughput
        total_seconds = total_time / 1_000_000
        throughput = validation_count / total_seconds
        
        # Assert throughput target
        assert throughput > 10_000, "Throughput #{Float.round(throughput)} ops/sec, should be >10,000 ops/sec"
      end
    end
    
    test "adaptive optimization switches based on load" do
      hot_path_data = %{
        operation_id: 12345,
        data_chunk: <<1, 2, 3, 4, 5>>,
        sequence_number: 100
      }
      
      # Test low load (standard validation)
      with_mock Foundation.Perimeter.PerformanceMonitor, [], [
        get_zone_load: fn(:hot_path_data) -> 500 end
      ] do
        
        assert_telemetry_event [:foundation, :perimeter, :coupling, :validation_success], %{} do
          assert {:ok, _} = HotPathContracts.validate_hot_path_data(hot_path_data)
        end
      end
      
      # Test high load (hot path validation)
      with_mock Foundation.Perimeter.PerformanceMonitor, [], [
        get_zone_load: fn(:hot_path_data) -> 2000 end
      ] do
        
        assert_telemetry_event [:foundation, :perimeter, :coupling, :hot_path_validation], %{} do
          assert {:ok, _} = HotPathContracts.validate_hot_path_data(hot_path_data)
        end
      end
    end
  end
  
  describe "Coupling zone performance monitoring" do
    test "provides detailed performance metrics" do
      performance = HotPathContracts.hot_path_data_performance_check()
      
      assert performance.zone_name == :hot_path_data
      assert is_integer(performance.current_load)
      assert performance.load_threshold == 1000
      assert performance.is_hot_path == true
      assert performance.performance_level in [:normal, :elevated, :high, :critical]
    end
    
    test "correctly determines hot path activation" do
      # Test with high load
      with_mock Foundation.Perimeter.PerformanceMonitor, [], [
        get_zone_load: fn(:hot_path_data) -> 2500 end
      ] do
        
        performance = HotPathContracts.hot_path_data_performance_check()
        assert performance.hot_path_active == true
        assert performance.performance_level == :critical
      end
      
      # Test with normal load
      with_mock Foundation.Perimeter.PerformanceMonitor, [], [
        get_zone_load: fn(:hot_path_data) -> 300 end
      ] do
        
        performance = HotPathContracts.hot_path_data_performance_check()
        assert performance.hot_path_active == false
        assert performance.performance_level == :normal
      end
    end
  end
  
  describe "Coupling zone schema and optimization" do
    test "generates optimized schema with performance config" do
      schema = HotPathContracts.hot_path_data_schema()
      
      assert schema.name == :hot_path_data
      assert schema.zone == :coupling
      assert schema.module == HotPathContracts
      assert is_list(schema.fields)
      
      # Check performance configuration
      config = schema.performance_config
      assert config.hot_path == true
      assert config.validation_mode == :minimal
      assert config.optimization_level == :maximum
      assert config.load_threshold == 1000
    end
    
    test "field validators use maximum optimization" do
      # Test ultra-fast field validators
      assert {:ok, 12345} = HotPathContracts.validate_hot_path_data_operation_id(12345)
      assert {:ok, "invalid"} = HotPathContracts.validate_hot_path_data_operation_id("invalid")  # Should pass with max optimization
      
      assert {:ok, <<1, 2, 3>>} = HotPathContracts.validate_hot_path_data_data_chunk(<<1, 2, 3>>)
      assert {:ok, 999} = HotPathContracts.validate_hot_path_data_sequence_number(999)
    end
  end
  
  describe "Coupling zone validation modes" do
    test "none validation mode trusts input completely" do
      # This would test a coupling zone with validation_mode: :none
      # Should accept any input without validation
    end
    
    test "minimal validation mode only checks required fields" do
      minimal_data = %{
        operation_id: "this-should-be-integer",  # Wrong type but minimal mode might accept
        data_chunk: <<1, 2, 3>>,
        sequence_number: 100
      }
      
      # In minimal mode, type errors might be ignored for performance
      # This depends on the specific implementation of minimal validation
    end
  end
end

defmodule Foundation.Perimeter.Coupling.HotPathContracts do
  use Foundation.Perimeter.Coupling
  
  coupling_zone :hot_path_data do
    field :operation_id, :integer, required: true
    field :data_chunk, :binary, required: true
    field :sequence_number, :integer, required: true, range: 0..999999
    field :checksum, :integer, required: false
    
    performance_config do
      hot_path true
      validation_mode :minimal
      optimization_level :maximum
      load_threshold 1000
    end
  end
  
  coupling_zone :ultra_fast_messaging do
    field :message_id, :integer, required: true
    field :payload, :binary, required: true
    field :priority, :integer, required: false, range: 1..10, default: 5
    
    performance_config do
      hot_path true
      validation_mode :none  # No validation for maximum speed
      optimization_level :maximum
      load_threshold 500
    end
  end
  
  coupling_zone :internal_coordination do
    field :coordinator_id, :atom, required: true
    field :operation_type, :atom, required: true
    field :metadata, :map, required: false
    
    performance_config do
      hot_path false
      validation_mode :standard
      optimization_level :standard
      load_threshold 2000
    end
  end
end

defmodule Foundation.Perimeter.Coupling.PerformanceBenchmark do
  @doc """
  Benchmark contract for extreme performance testing
  """
  use Foundation.Perimeter.Coupling
  
  coupling_zone :benchmark_data do
    field :id, :integer, required: true
    field :data, :binary, required: true
    field :timestamp, :integer, required: true
    
    performance_config do
      hot_path true
      validation_mode :none
      optimization_level :maximum
      load_threshold 100
    end
  end
end

defmodule Foundation.Perimeter.PerformanceMonitor.Mock do
  @doc """
  Mock performance monitor for testing adaptive optimization
  """
  
  def get_zone_load(:hot_path_data), do: 1500  # Default high load
  def get_zone_load(:ultra_fast_messaging), do: 800  # Default medium load
  def get_zone_load(:internal_coordination), do: 300  # Default low load
  def get_zone_load(_), do: 100  # Default very low load
end