using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Kinect = Windows.Kinect;

public class PlayerReplay : MonoBehaviour
{
    // Joints already given the values from BodySourceView.cs that keeps updating
    public Transform[] joints = new Transform[25];
    public List<Vector3[]> jointsSequence = new List<Vector3[]>();
    public List<float> recordingTimes = new List<float>();
    public Material boneMaterial;
    public Material transparentMat;

    private Dictionary<Kinect.JointType, Kinect.JointType> _BoneMap = new Dictionary<Kinect.JointType, Kinect.JointType>()
    {
        { Kinect.JointType.FootLeft, Kinect.JointType.AnkleLeft },
        { Kinect.JointType.AnkleLeft, Kinect.JointType.KneeLeft },
        { Kinect.JointType.KneeLeft, Kinect.JointType.HipLeft },
        { Kinect.JointType.HipLeft, Kinect.JointType.SpineBase },

        { Kinect.JointType.FootRight, Kinect.JointType.AnkleRight },
        { Kinect.JointType.AnkleRight, Kinect.JointType.KneeRight },
        { Kinect.JointType.KneeRight, Kinect.JointType.HipRight },
        { Kinect.JointType.HipRight, Kinect.JointType.SpineBase },

        { Kinect.JointType.HandTipLeft, Kinect.JointType.HandLeft },
        { Kinect.JointType.ThumbLeft, Kinect.JointType.HandLeft },
        { Kinect.JointType.HandLeft, Kinect.JointType.WristLeft },
        { Kinect.JointType.WristLeft, Kinect.JointType.ElbowLeft },
        { Kinect.JointType.ElbowLeft, Kinect.JointType.ShoulderLeft },
        { Kinect.JointType.ShoulderLeft, Kinect.JointType.SpineShoulder },

        { Kinect.JointType.HandTipRight, Kinect.JointType.HandRight },
        { Kinect.JointType.ThumbRight, Kinect.JointType.HandRight },
        { Kinect.JointType.HandRight, Kinect.JointType.WristRight },
        { Kinect.JointType.WristRight, Kinect.JointType.ElbowRight },
        { Kinect.JointType.ElbowRight, Kinect.JointType.ShoulderRight },
        { Kinect.JointType.ShoulderRight, Kinect.JointType.SpineShoulder },

        { Kinect.JointType.SpineBase, Kinect.JointType.SpineMid },
        { Kinect.JointType.SpineMid, Kinect.JointType.SpineShoulder },
        { Kinect.JointType.SpineShoulder, Kinect.JointType.Neck },
        { Kinect.JointType.Neck, Kinect.JointType.Head },
    };

    private GameObject body;
    private bool beginAnimation;
    private float t;

    private void Update()
    {
        // TODO: wrong, put it to new class
        if (!beginAnimation)
            return;

        t += Time.deltaTime / 2;
        Color newColor = new Color(1, 1, 1, Mathf.Lerp(0, 1, t));

        foreach (MeshRenderer mr in body.GetComponentsInChildren<MeshRenderer>())
        {
            mr.material.color = newColor;
        }
        foreach (LineRenderer lr in body.GetComponentsInChildren<LineRenderer>())
        {
            lr.startColor = newColor;
            lr.endColor = newColor;
        }
    }

    public void AddJoints(float recordingTime)
    {
        Vector3[] positions = new Vector3[25];

        for (int i = 0; i < joints.Length; i++)
        {
            positions[i] = joints[i].position;
        }

        jointsSequence.Add(positions);
        recordingTimes.Add(recordingTime);
    }

    public void Save()
    {
        if (jointsSequence.Count == 0)
        {
            Debug.Log("jointsSequence is empty");
            return;
        }
        SaveSystem.Save(jointsSequence, recordingTimes);
        Debug.Log("Save success");
    }

    public void Load()
    {
        JointsDataSequence data = SaveSystem.Load();

        if (data == null)
        {
            Debug.Log("Load failed");
            return;
        }

        ShowJoints(data);
        Debug.Log("Load success");
    }

    private void ShowJoints(JointsDataSequence data)
    {
        List<JointsData> jointsData = data.jointsDataSequence;
        List<float> recordingTimes = data.recordingTimes;

        // Filtered datas according to distance
        List<JointsData> newJointsData = new List<JointsData>();
        List<float> newRecordingTimes = new List<float>();

        JointsData prevJd = jointsData[0];

        // Add first pose
        newJointsData.Add(jointsData[0]);
        newRecordingTimes.Add(recordingTimes[0]);

        for (int i = 1; i < jointsData.Count; i++)
        {
            JointsData jd = jointsData[i];

            for (Kinect.JointType jt = Kinect.JointType.SpineBase; jt <= Kinect.JointType.ThumbRight; jt++)
            {
                // Skip if head joint
                if (jt == Kinect.JointType.Head)
                    continue;

                Vector3 prevJointPosition = new Vector3(prevJd.jointsPositionsX[(int)jt], prevJd.jointsPositionsY[(int)jt], prevJd.jointsPositionsZ[(int)jt]);
                Vector3 jointPosition = new Vector3(jd.jointsPositionsX[(int)jt], jd.jointsPositionsY[(int)jt], jd.jointsPositionsZ[(int)jt]);
                float distance = Vector3.Distance(prevJointPosition, jointPosition);

                // If a joint is bigger than certain distance, add it to the replay, else ignore it
                // TODO: need to test distance value
                if (distance >= 2)
                {
                    newJointsData.Add(jd);
                    newRecordingTimes.Add(recordingTimes[i]);
                    prevJd = jd;
                    continue;
                }
            }
        }

        // TODO: visualize need to test
        StartCoroutine(Visualize(newJointsData, newRecordingTimes));
    }

    private IEnumerator Visualize(List<JointsData> newJointsData, List<float> newRecordingTimes)
    {
        for (int i = 0; i < newJointsData.Count; i++)
        {
            float waitTime = 1;
            if (i < newRecordingTimes.Count - 1)
            {
                waitTime = newRecordingTimes[i + 1] - newRecordingTimes[i];
            }
            WaitForSeconds wait = new WaitForSeconds(waitTime);

            // Create GameObject body
            GameObject body = new GameObject("Recorded Body " + i);
            for (Kinect.JointType jt = Kinect.JointType.SpineBase; jt <= Kinect.JointType.ThumbRight; jt++)
            {
                // skip if head joint
                if (jt == Kinect.JointType.Head)
                    continue;

                // Create GameObject cubes for joints
                GameObject jointObj = GameObject.CreatePrimitive(PrimitiveType.Cube);
                LineRenderer lr = jointObj.AddComponent<LineRenderer>();
                lr.positionCount = 2;
                lr.material = boneMaterial;
                lr.startWidth = 0.3f;
                lr.endWidth = 0.3f;

                jointObj.transform.localScale = new Vector3(0.3f, 0.3f, 0.3f);
                jointObj.name = jt.ToString();
                JointsData jd = newJointsData[i];
                jointObj.transform.position = new Vector3(jd.jointsPositionsX[(int)jt], jd.jointsPositionsY[(int)jt], jd.jointsPositionsZ[(int)jt]);
                jointObj.transform.parent = body.transform;
            }

            // Connect the joints with LineRenderer
            for (Kinect.JointType jt = Kinect.JointType.SpineBase; jt <= Kinect.JointType.ThumbRight; jt++)
            {
                // skip if dictionary not contains the joint or neck joint
                if (!_BoneMap.ContainsKey(jt) || jt == Kinect.JointType.Neck)
                    continue;

                Transform jointObj = body.transform.Find(jt.ToString());
                Transform targetJoint = body.transform.Find(_BoneMap[jt].ToString());
                LineRenderer lr = jointObj.GetComponent<LineRenderer>();

                lr.SetPosition(0, jointObj.localPosition);
                lr.SetPosition(1, targetJoint.localPosition);
            }

            yield return wait;
            Destroy(body);
        }
    }

    private IEnumerator VisualizeFadeIn(List<JointsData> newJointsData, List<float> newRecordingTimes)
    {
        for (int i = 0; i < newJointsData.Count; i++)
        {
            float waitTime = 1;
            if (i < newRecordingTimes.Count - 1)
            {
                waitTime = newRecordingTimes[i + 1] - newRecordingTimes[i];
            }
            WaitForSeconds wait = new WaitForSeconds(waitTime);

            // TODO: create new class to make every body run fade in

            yield return wait;
            Destroy(body);
        }
    }
}