using UnityEngine;
using System.Collections.Generic;
using System;
using Unity.MLAgents.Analytics;
using Unity.MLAgents.Sensors;

namespace Unity.MLAgents.Policies
{
    /// <summary>
    /// The Remote Policy only works when training.
    /// When training your Agents, the RemotePolicy will be controlled by Python.
    /// </summary>
    internal class RemotePolicy : IPolicy
    {
        int m_AgentId;
        string m_FullyQualifiedBehaviorName;

        private bool m_AnalyticsSent = false;
        private BrainParameters m_BrainParameters;

        internal ICommunicator m_Communicator;

        /// <inheritdoc />
        public RemotePolicy(
            BrainParameters brainParameters,
            string fullyQualifiedBehaviorName)
        {
            m_FullyQualifiedBehaviorName = fullyQualifiedBehaviorName;
            m_Communicator = Academy.Instance.Communicator;
            m_Communicator?.SubscribeBrain(m_FullyQualifiedBehaviorName, brainParameters);
            m_BrainParameters = brainParameters;
        }

        /// <inheritdoc />
        public void RequestDecision(AgentInfo info, List<ISensor> sensors)
        {

            if (!m_AnalyticsSent)
            {
                m_AnalyticsSent = true;
                TrainingAnalytics.RemotePolicyInitialized(
                    m_FullyQualifiedBehaviorName,
                    sensors,
                    m_BrainParameters
                );
            }
            m_AgentId = info.episodeId;
            m_Communicator?.PutObservations(m_FullyQualifiedBehaviorName, info, sensors);
        }

        /// <inheritdoc />
        public float[] DecideAction()
        {
            m_Communicator?.DecideBatch();
            return m_Communicator?.GetActions(m_FullyQualifiedBehaviorName, m_AgentId);
        }

        public void Dispose()
        {
        }
    }
}