%% @doc Liquid Conglomerate Supervisor.
%%
%% Supervises all 3 silos of the Liquid Conglomerate v2 architecture:
%% - Task Silo: Evolution optimization (τ = 50)
%% - Resource Silo: System stability (τ = 5)
%% - Distribution Silo: Mesh optimization (τ = 1)
%%
%% Additionally supervises the meta_controller (L2 strategic layer) when enabled:
%% - Meta Controller: LTC-based hierarchical control (outputs L1 guidance)
%%
%% Each silo operates independently with its own hierarchical levels (L0/L1/L2).
%% When meta_controller is enabled, it provides L2 guidance to task_silo.
%%
%% @author Macula.io
%% @copyright 2025 Macula.io
-module(lc_supervisor).
-behaviour(supervisor).

-include("meta_controller.hrl").

%% API
-export([start_link/0, start_link/1]).

%% Supervisor callbacks
-export([init/1]).

-define(SERVER, ?MODULE).

%%% ============================================================================
%%% API Functions
%%% ============================================================================

%% @doc Start the Liquid Conglomerate supervisor with default configuration.
-spec start_link() -> {ok, pid()} | ignore | {error, term()}.
start_link() ->
    start_link(#{}).

%% @doc Start the Liquid Conglomerate supervisor with custom configuration.
%%
%% Config options:
%% - resource_silo: Map of resource silo configuration
%% - task_silo: Map of task silo configuration (future)
%% - distribution_silo: Map of distribution silo configuration (future)
%%
%% If the supervisor is already running, returns the existing pid.
-spec start_link(map()) -> {ok, pid()} | ignore | {error, term()}.
start_link(Config) ->
    case whereis(?SERVER) of
        undefined ->
            supervisor:start_link({local, ?SERVER}, ?MODULE, Config);
        Pid when is_pid(Pid) ->
            %% Already running, return existing pid
            {ok, Pid}
    end.

%%% ============================================================================
%%% Supervisor Callbacks
%%% ============================================================================

init(Config) ->
    SupFlags = #{
        strategy => one_for_one,
        intensity => 5,
        period => 10
    },

    %% ========================================================================
    %% LC v2 Infrastructure - Cross-Silo Communication
    %% ========================================================================

    %% Cross-silo coordinator (must start first for signal routing)
    CrossSiloConfig = maps:get(cross_silo, Config, #{}),
    CrossSiloSpec = #{
        id => lc_cross_silo,
        start => {lc_cross_silo, start_link, [CrossSiloConfig]},
        restart => permanent,
        shutdown => 5000,
        type => worker,
        modules => [lc_cross_silo]
    },

    %% ========================================================================
    %% Resource Silo Components
    %% ========================================================================

    ResourceSiloConfig = maps:get(resource_silo, Config, #{}),

    %% Resource L0 Sensors - Collect system metrics
    ResourceSensorsSpec = #{
        id => resource_l0_sensors,
        start => {resource_l0_sensors, start_link, [ResourceSiloConfig]},
        restart => permanent,
        shutdown => 5000,
        type => worker,
        modules => [resource_l0_sensors]
    },

    %% Resource L0 Actuators - Apply TWEANN outputs
    ResourceActuatorsSpec = #{
        id => resource_l0_actuators,
        start => {resource_l0_actuators, start_link, [ResourceSiloConfig]},
        restart => permanent,
        shutdown => 5000,
        type => worker,
        modules => [resource_l0_actuators]
    },

    %% Resource Silo - Main controller
    ResourceSiloSpec = #{
        id => resource_silo,
        start => {resource_silo, start_link, [ResourceSiloConfig]},
        restart => permanent,
        shutdown => 5000,
        type => worker,
        modules => [resource_silo]
    },

    %% ========================================================================
    %% Task Silo Components
    %% ========================================================================

    TaskSiloConfig = maps:get(task_silo, Config, #{}),

    %% Task L0 Sensors - Collect evolution statistics
    TaskSensorsSpec = #{
        id => task_l0_sensors,
        start => {task_l0_sensors, start_link, [TaskSiloConfig]},
        restart => permanent,
        shutdown => 5000,
        type => worker,
        modules => [task_l0_sensors]
    },

    %% Task L0 Actuators - Apply TWEANN outputs
    TaskActuatorsSpec = #{
        id => task_l0_actuators,
        start => {task_l0_actuators, start_link, [TaskSiloConfig]},
        restart => permanent,
        shutdown => 5000,
        type => worker,
        modules => [task_l0_actuators]
    },

    %% Meta Controller (L2) - Strategic layer (optional)
    MetaControllerEnabled = maps:get(enable_meta_controller, Config, false),
    MetaControllerSpecs = case MetaControllerEnabled of
        true ->
            MetaControllerConfig = build_meta_config(Config),
            [#{
                id => meta_controller,
                start => {meta_controller, start_link, [MetaControllerConfig, [{name, {local, meta_controller}}]]},
                restart => permanent,
                shutdown => 5000,
                type => worker,
                modules => [meta_controller]
            }];
        false ->
            []
    end,

    %% Task Silo - Main controller
    %% L0 TWEANN mode: when enabled, task_silo uses lc_silo_chain for neural network-based
    %% hyperparameter control instead of rule-based L1 adjustments
    %% Enabled by default for LC v2 architecture
    L0TweannEnabled = maps:get(enable_l0_tweann, Config, true),

    TaskSiloConfigWithFlags = TaskSiloConfig#{
        l2_enabled => MetaControllerEnabled,
        l0_tweann_enabled => L0TweannEnabled
    },
    TaskSiloConfigWithL2 = TaskSiloConfigWithFlags,
    TaskSiloSpec = #{
        id => task_silo,
        start => {task_silo, start_link, [TaskSiloConfigWithL2]},
        restart => permanent,
        shutdown => 5000,
        type => worker,
        modules => [task_silo]
    },

    %% ========================================================================
    %% Distribution Silo Components (optional, for mesh networking)
    %% ========================================================================

    DistributionEnabled = maps:get(enable_distribution_silo, Config, false),
    DistSiloConfig = maps:get(distribution_silo, Config, #{}),

    DistributionSpecs = case DistributionEnabled of
        true ->
            [
                %% Distribution L0 Sensors
                #{
                    id => distribution_l0_sensors,
                    start => {distribution_l0_sensors, start_link, [DistSiloConfig]},
                    restart => permanent,
                    shutdown => 5000,
                    type => worker,
                    modules => [distribution_l0_sensors]
                },
                %% Distribution L0 Actuators
                #{
                    id => distribution_l0_actuators,
                    start => {distribution_l0_actuators, start_link, [DistSiloConfig]},
                    restart => permanent,
                    shutdown => 5000,
                    type => worker,
                    modules => [distribution_l0_actuators]
                }
                %% Distribution Silo main controller would go here
            ];
        false ->
            []
    end,

    %% ========================================================================
    %% Child Ordering
    %% ========================================================================
    %% Order matters for dependency:
    %% 1. Cross-silo coordinator (signal routing)
    %% 2. Sensors (collect inputs)
    %% 3. Actuators (apply outputs)
    %% 4. Meta controller (L2 guidance)
    %% 5. Main silo controllers

    ChildSpecs = [CrossSiloSpec,
                  ResourceSensorsSpec, ResourceActuatorsSpec,
                  TaskSensorsSpec, TaskActuatorsSpec]
                 ++ MetaControllerSpecs
                 ++ [ResourceSiloSpec, TaskSiloSpec]
                 ++ DistributionSpecs,

    error_logger:info_msg("[lc_supervisor] Starting Liquid Conglomerate v2 with ~p children "
                         "(L2=~p, Distribution=~p)~n",
                         [length(ChildSpecs), MetaControllerEnabled, DistributionEnabled]),

    {ok, {SupFlags, ChildSpecs}}.

%%% ============================================================================
%%% Internal Functions
%%% ============================================================================

%% @doc Build meta_config from supervisor config.
%% Uses defaults with overrides from config map.
-spec build_meta_config(map()) -> meta_config().
build_meta_config(Config) ->
    MetaOpts = maps:get(meta_controller, Config, #{}),
    %% Default topology: 11 inputs (8 evolution + 3 resource), 5 outputs (L1 guidance)
    Topology = maps:get(network_topology, MetaOpts, {11, [24, 16, 8], 5}),
    TimeConstant = maps:get(time_constant, MetaOpts, 50.0),
    NeuronType = maps:get(neuron_type, MetaOpts, cfc),
    LearningRate = maps:get(learning_rate, MetaOpts, 0.001),
    #meta_config{
        network_topology = Topology,
        time_constant = TimeConstant,
        neuron_type = NeuronType,
        learning_rate = LearningRate
    }.