using UnityEngine;
using UnityEngine.UI;
using UnityEngine.AI;
using System.Collections.Generic;
using System.IO;
using System;

[DefaultExecutionOrder(61)]
[RequireComponent(typeof(InstantiatePrefab), typeof(WriteInCSV), typeof(ReadFromCSV))]
public class SpatialTimeSimulation : MonoBehaviour
{
    // Waypoints and Rotations
    [HideInInspector]
    public Tuple<List<float>, List<Vector3>, List<Quaternion>, List<float>>[][] timePosRotList;

    // Private Journey Settings
    private int currentStartPoint;
    private float startTime;

    // Global GameObjects
    private GameObject[][] humansGO;
    private NavMeshAgent[][] humansNMA;
    private Animator[][] humansA;

    // Playback variables
    private int[] maxIJ;
    private int indexChangeRate;
    [HideInInspector]
    public bool rewind, pause, play; //PlaybackController

    // Slider Settings
    public Slider slider;
    public GameObject buttons;
    private float prevSliderValue;

    // Thief Settings
    //private Vector3 stealHere;

    // Spatial time visualization
    private List<Vector3>[][] positions;
    public float thickness = 0.1f;
    public Material material;
    public Color color;

    private void Start()
    {
        // Get information from InstatiatePrefab
        humansGO = gameObject.GetComponent<InstantiatePrefab>().humanGameObject;
        humansA = gameObject.GetComponent<InstantiatePrefab>().humanAnimator;
        humansNMA = gameObject.GetComponent<InstantiatePrefab>().humanNavMeshAgent;
        positions = new List<Vector3>[humansGO.Length][];
        //stealHere = gameObject.GetComponent<ControllingThief>().stealHere;

        // Read from CSV file and save time, position, rotation in matrix
        int index = gameObject.GetComponent<WriteInCSV>().index; 
        string dir = Directory.GetCurrentDirectory();
        string reference = @"\Assets\Data_position\Walk" + index + ".csv";
        timePosRotList = gameObject.GetComponent<ReadFromCSV>().ReadFromCSVFile(dir + reference);

        // Add 0.5f + time to y

        // Disable components and add LineRenderer
        currentStartPoint = 0;
        for (int i = 0; i < humansGO.Length; ++i)
        {
            positions[i] = new List<Vector3>[humansGO[i].Length];
            for (int j = 0; j < humansGO[i].Length; ++j)
            {
                // A shortcut to use the position data immediately for the LineRenderer
                positions[i][j] = new List<Vector3>();
                foreach (var position in timePosRotList[i][j].Item2)
                {
                    positions[i][j].Add(new Vector3(position.x, 0.5f + timePosRotList[i][j].Item1[currentStartPoint], position.z));
                    currentStartPoint++;
                }
                currentStartPoint = 0;
                
                // Every component should be disabled except the humans game object, bc the LineRenderer operates there
                humansGO[i][j].SetActive(true);
                humansA[i][j].enabled = false;
                humansNMA[i][j].enabled = false;

                foreach(Transform child in humansGO[i][j].transform)
                {
                    child.gameObject.SetActive(false);
                }

                // Add the LineRenderer to the gameobject
                LineRenderer drawPath = humansGO[i][j].AddComponent<LineRenderer>();
                //drawPath.material = new Material(Shader.Find("Sprites/Default"));
                //drawPath.material = new Material(Shader.Find("Particles/Standard Unlit"));
                //drawPath.material = new Material(Shader.Find("VolumetricLine/LineStrip-TextureAlphaBlended"));
                drawPath.material = material;
                drawPath.startColor = color;
                drawPath.endColor = color;
                drawPath.startWidth = thickness;
                drawPath.endWidth = thickness;
                drawPath.numCapVertices = 90;
                drawPath.shadowCastingMode = UnityEngine.Rendering.ShadowCastingMode.Off;
                drawPath.receiveShadows = false;

                drawPath.positionCount = currentStartPoint + 1;
                drawPath.SetPosition(currentStartPoint, positions[i][j][currentStartPoint]);
            }
        }

        // Set the Slider settings
        if (slider == null)
        {
            Debug.Log("No Slider instance attached");
            return;
        }
        maxIJ = GetHumanWithLongestScreenTime();
        float maxTime = (float)Math.Round(timePosRotList[maxIJ[0]][maxIJ[1]].Item1[timePosRotList[maxIJ[0]][maxIJ[1]].Item1.Count - 1], 2);
        slider.minValue = 0;
        slider.maxValue = (maxTime / Time.deltaTime);
        slider.wholeNumbers = true;
        prevSliderValue = slider.value;

        // Don't show buttons
        if (buttons.activeSelf)
            buttons.SetActive(false);

        currentStartPoint++;
        slider.value = currentStartPoint;
        startTime = Time.time;
    }

    private void FixedUpdate()
    {
        if (pause)
            indexChangeRate = 0;
        if (play)
            indexChangeRate = 1;
        if (rewind)
            indexChangeRate = -1;

        if (play || rewind)
        {
            if ((currentStartPoint + indexChangeRate) < timePosRotList[maxIJ[0]][maxIJ[1]].Item2.Count && (currentStartPoint + indexChangeRate) >= 0)
            {
                if (slider.value - prevSliderValue == -1 || slider.value - prevSliderValue == 0 || slider.value - prevSliderValue == 1) // rewind || play
                {
                    prevSliderValue = slider.value;
                    currentStartPoint += indexChangeRate;
                    slider.value = currentStartPoint;
                }
                else
                {
                    prevSliderValue = slider.value;
                    currentStartPoint = (int)slider.value;
                }
                SetTransform(currentStartPoint);
            }
            else if (slider.value - prevSliderValue != -1 || slider.value - prevSliderValue != 0 || slider.value - prevSliderValue != 1)
            {
                currentStartPoint = (int)slider.value;
            }
        }
        else
        {
            currentStartPoint = (int)slider.value;
            SetTransform(currentStartPoint);
        }
    }

    private void SetTransform(int currentStartPoint)
    {
        for (int i = 0; i < humansGO.Length; ++i)
        {
            for (int j = 0; j < humansGO[i].Length; ++j)
            {
                LineRenderer drawPath = humansGO[i][j].GetComponent<LineRenderer>();
                
                // if so ArgumentOutOfRangeException
                if ((currentStartPoint + indexChangeRate) >= (timePosRotList[i][j].Item2.Count - 1) || (currentStartPoint + indexChangeRate) < 0)
                {
                    if((currentStartPoint + indexChangeRate) >= (timePosRotList[i][j].Item2.Count - 1))
                    {
                        drawPath.positionCount = positions[i][j].Count;
                        drawPath.SetPositions(positions[i][j].ToArray());
                    }
                    continue;
                }
                
                if (currentStartPoint < timePosRotList[i][j].Item2.Count)
                {
                    // We need to specify the Length of the positionCount variable
                    drawPath.positionCount = currentStartPoint + 1;
                    // We copy the positions list and remove every element after the currentStartPoint from the copy
                    List<Vector3> tmpLst = new List<Vector3>(positions[i][j]);
                    tmpLst.RemoveRange(currentStartPoint + 1, positions[i][j].Count - currentStartPoint - 1);
                    drawPath.SetPositions(tmpLst.ToArray());
                }
            }
        }
    }

    private int[] GetHumanWithLongestScreenTime()
    {
        int[] maxIJ = new int[2] { 0, 0 };
        float currentMaxTime = 0;

        for (int i = 0; i < humansGO.Length; ++i)
        {
            for (int j = 0; j < humansGO[i].Length; ++j)
            {
                if (currentMaxTime < timePosRotList[i][j].Item1.Count)
                {
                    currentMaxTime = timePosRotList[i][j].Item1.Count;
                    maxIJ[0] = i;
                    maxIJ[1] = j;
                }
            }
        }

        return maxIJ;
    }
}