using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using Unity.Barracuda;
using Unity.Barracuda.ONNX;
using Unity.MLAgents.Policies;
using UnityEngine;

public class ModelManager : MonoBehaviour
{
    [SerializeField]
    public string m_ModelName;

    [Header("Model Settings")]
    public NNModel m_InitialModel;
    public string m_DirectoryPath;

    private List<NNModel> m_ModelList = new List<NNModel>();
    private int m_CurrentModel = 0;

    private BehaviorParameters m_Parameters;
    private RagDollAgent m_Agent;

    // Unity Events //
    public delegate void onUpdateModelNameDelegate(float modelName);
    public static onUpdateModelNameDelegate m_UpdateModelName;
    private void OnEnable()
    {
        RagDollAgent.m_MoveToNextModel += SwapModel;
        m_Parameters = GetComponent<BehaviorParameters>();
        m_Agent = GetComponent<RagDollAgent>();
    }

    private void OnDisable()
    {
        RagDollAgent.m_MoveToNextModel -= SwapModel;
    }

    private void Start()
    {
        LoadLocalModels();
        SetModel(m_ModelList[m_CurrentModel]);
    }

    private void SwapModel()
    {
        m_CurrentModel++;
        if (m_CurrentModel >= m_ModelList.Count)
            m_CurrentModel = 0;
        SetModel(m_ModelList[m_CurrentModel]);
    }

    private void SetModel(NNModel model)
    {
        m_Agent.SetModel("DReCon-v0", model, InferenceDevice.Burst);
        UpdateModelName();
    }

    private void LoadLocalModels()
    {
        DirectoryInfo dirInfo = new DirectoryInfo("C:\\Users\\caile\\Desktop\\onnx");
        FileInfo[] nnList = dirInfo.GetFiles("*.onnx");
        // Sort files by filename (assuming filenames are numeric)
        Array.Sort(nnList, (x, y) => {
            int num1 = int.Parse(Path.GetFileNameWithoutExtension(x.Name));
            int num2 = int.Parse(Path.GetFileNameWithoutExtension(y.Name));
            return num1.CompareTo(num2);
        });

        ConvertNNModels(nnList);
    }

    private void ConvertNNModels(FileInfo[] nnList)
    {
        foreach (FileInfo element in nnList)
        {
            
            var converter = new ONNXModelConverter(true);
            byte[] modelData = File.ReadAllBytes(element.FullName.ToString());
            Model model = converter.Convert(modelData);
            NNModelData modelD = ScriptableObject.CreateInstance<NNModelData>();
            using (var memoryStream = new MemoryStream())
            using (var writer = new BinaryWriter(memoryStream))
            {
                ModelWriter.Save(writer, model);
                modelD.Value = memoryStream.ToArray();
            }
            modelD.name = "Data";
            modelD.hideFlags = HideFlags.HideInHierarchy;
            NNModel result = ScriptableObject.CreateInstance<NNModel>();
            result.modelData = modelD;
            result.name = element.Name;
            // Add Model to Model List
            m_ModelList.Add(result);
        }
    }

    private void UpdateModelName()
    {
        if (m_Parameters != null)
        {
            m_ModelName = Path.GetFileNameWithoutExtension(m_Parameters.Model.name);
            m_UpdateModelName?.Invoke(float.Parse(m_ModelName));
        }
    }
}