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//! This module defines a default decision module.

use async_broadcast::Sender;
use async_std::task;

use crate::definitions::agent as definitions_agent;
use crate::definitions::task as definitions_task;
use crate::delegation::Task as DelTask;
use crate::knowledge_base::{KnowledgeBase, KnowledgeBaseInterface};
use crate::{agent, decision, delegation, execution, knowledge_base, module, utils, Result};

//   ____        _   _
//  / __ \      | | (_)
//  | |  | |_ __ | |_ _  ___  _ __  ___
//  | |  | | '_ \| __| |/ _ \| '_ \/ __|
//  | |__| | |_) | |_| | (_) | | | \__ \
//   \____/| .__/ \__|_|\___/|_| |_|___/
//         | |
//         |_|

/// Options for the default decision module
pub struct Options {}

impl Options
{
  /// Create options for the default decision module
  pub fn new() -> Self
  {
    Self {}
  }
}

//  __  __           _       _
// |  \/  | ___   __| |_   _| | ___
// | |\/| |/ _ \ / _` | | | | |/ _ \
// | |  | | (_) | (_| | |_| | |  __/
// |_|  |_|\___/ \__,_|\__,_|_|\___|

module::create_module_private_interface!(
  ModulePrivateInterface,
  decision::InputMessage,
  decision::OutputMessage
);

/// This structure implements a decision module
pub struct Module {}

impl Module
{
  async fn handle_input_message(
    msg: decision::InputMessage,
    agent_data: &agent::AgentData,
    output_sender: &Sender<decision::OutputMessage>,
    execution_input_sender: &Sender<execution::InputMessage>,
  ) -> Result<()>
  {
    match msg
    {
      decision::InputMessage::DecideCFPAcceptance { cfp } =>
      {
        let task = definitions_task::Task::from_description(&cfp.task_type, &cfp.task_description)?;
        agent_data
          .knowledge_base
          .insert("tasks", cfp.uuid.to_hex(), &task)?;

        match task.get_container()
        {
          definitions_task::TaskContainer::Tst(tst) =>
          {
            let sr = crate::simulation::tst::simulate_execution(
              agent_data.states.to_owned_states()?,
              agent_data.capabilities.clone(),
              tst.clone(),
            )
            .await?;
            output_sender
              .broadcast(decision::OutputMessage::CFPProposal {
                proposal: delegation::Proposal {
                  agent_uri: agent_data.agent_uri.to_owned(),
                  cost: sr.get_estimated_cost(),
                  signature: Default::default(),
                  task_uuid: task.task_id(),
                },
              })
              .await;
          }
        }
      }
      decision::InputMessage::QueueExecution { uuid } =>
      {
        execution_input_sender
          .broadcast(execution::InputMessage::QueueExecution { uuid })
          .await;
        output_sender
          .broadcast(decision::OutputMessage::QueueExecutionResult {
            uuid,
            accepted: true,
          })
          .await;
      }
      decision::InputMessage::CancelExecution { uuid } =>
      {
        execution_input_sender
          .broadcast(execution::InputMessage::CancelExecution {
            uuid: uuid.to_owned(),
          })
          .await;
      }
    }
    Ok(())
  }
}

impl decision::Module for Module
{
  type Options = Options;
  fn start(
    agent_data: agent::AgentData,
    module_interfaces: (decision::ModuleInterface, ModulePrivateInterface),
    execution_interface: execution::ModuleInterface,
    _: Options,
  ) -> impl std::future::Future<Output = ()> + std::marker::Send + 'static
  {
    let (module_interface, module_private_interface) = module_interfaces;

    let mut input_receiver = module_private_interface.input_receiver.activate();
    let output_sender = module_private_interface.output_sender;

    let execution_input_sender = execution_interface.input_sender();

    async move {
      loop
      {
        let msg = input_receiver.recv().await;
        if let Ok(msg) = msg
        {
          if let Err(e) =
            Self::handle_input_message(msg, &agent_data, &output_sender, &execution_input_sender)
              .await
          {
            log::error!(
              "An error occured for agent {} when handling decision message: {}",
              agent_data.agent_uri,
              e
            );
          }
        }
        else
        {
          log::info!("Decision loop for {:?} is closing", agent_data.agent_uri);
          return;
        }
      }
    }
  }
}

impl module::Module for Module
{
  type InputMessage = decision::InputMessage;
  type OutputMessage = decision::OutputMessage;
  type ModulePrivateInterface = ModulePrivateInterface;
}