using Newtonsoft.Json;
using NUnit.Framework;
using System;
using System.Collections.Generic;
using System.Net.Sockets;
using UnityEngine;
using UnityEngine.InputSystem;

/* 本文件用于控制手势的采集和比对
 * 也包含导出和导入手势的功能
*/
public class GestureManager
{
    // Start is called once before the first execution of Update after the MonoBehaviour is created
    public List<GesturePointOffset> gesturePointOffsetList { set; get; } = new List<GesturePointOffset>();
    public int sampleRate { set; get; } = 10;        // 采样率
    private Vector2 prePointLoc = new Vector2(0, 0); // 第一个点
    private Vector2 curPointLoc = new Vector2(0, 0); // 第二个点
    private float timer = 0f;
    public bool isRecording;
    private float interval;
    private float lengthTorrence = 0.25f; // 允许的长度误差

    public GestureManager()
    {
        interval = (float)1 / sampleRate;
    }

    public string ExportToJson()
    {
        string json = string.Empty;
        if (gesturePointOffsetList.Count / 2 <= sampleRate) { return json; }
        json = JsonConvert.SerializeObject(this);
        return json;
    }

    public void ImportFromJson(string json)
    {
        this.isRecording = false;
        var data = JsonConvert.DeserializeObject<Dictionary<string, object>>(json);
        this.sampleRate = int.Parse(data["sampleRate"].ToString());
        gesturePointOffsetList.Clear();
        GesturePointOffset[] pointOffsets = JsonConvert.DeserializeObject<GesturePointOffset[]>(data["gesturePointOffsetList"].ToString());
        foreach (var point in pointOffsets)
        {
            gesturePointOffsetList.Add(point);
        }
    }

    // 添加一个运动轨迹
    public void Record()
    {
        Vector2 pointLoc = Pointer.current.position.ReadValue();
        if (isRecording)
        {
            if (gesturePointOffsetList.Count == 0)
            {
                prePointLoc = pointLoc;
                curPointLoc = pointLoc;
                GesturePointOffset gesturePointMovement = new GesturePointOffset(0, 0);
                gesturePointOffsetList.Add(gesturePointMovement);
                return;
            }
            else
            {
                //Debug.Log("interval:" + interval.ToString());
                timer += Time.deltaTime;
                if (timer >= interval)
                {
                    timer = 0f;

                    curPointLoc = pointLoc;
                    float distance = Vector2.Distance(prePointLoc, curPointLoc);
                    float angle = Vector2.Angle(prePointLoc, curPointLoc);
                    GesturePointOffset gesturePointMovement = new GesturePointOffset(distance, angle);

                    if (distance * angle != 0)
                    {
                        gesturePointOffsetList.Add(gesturePointMovement);
                        Debug.Log("log time:" + DateTime.Now.ToString());
                    }
                    prePointLoc = curPointLoc;
                }
            }
        }
    }

    public float CompareGesture(GestureManager anotherGesture)
    {
        float score = 0f;
        if (this.sampleRate != anotherGesture.sampleRate)
        {
            Debug.Log("Sample rate not match");
            return -1f;
        }

        int maxGesturePoints = Mathf.Max(this.gesturePointOffsetList.Count, anotherGesture.gesturePointOffsetList.Count);
        int minGesturePoints = Mathf.Min(this.gesturePointOffsetList.Count, anotherGesture.gesturePointOffsetList.Count);
        for (int i = 0; i < minGesturePoints; i++)
        {

            float distanceMin = Mathf.Min(this.gesturePointOffsetList[i].distance - anotherGesture.gesturePointOffsetList[i].distance);
            float distanceMax = Mathf.Max(this.gesturePointOffsetList[i].distance - anotherGesture.gesturePointOffsetList[i].distance);
            float angleMin = Mathf.Min(this.gesturePointOffsetList[i].angle - anotherGesture.gesturePointOffsetList[i].angle);
            float angleMax = Mathf.Max(this.gesturePointOffsetList[i].angle - anotherGesture.gesturePointOffsetList[i].angle);

            float distanceScore = 0f;
            if (distanceMin == 0)
            {
                distanceScore = 1f;
            }
            else
            {
                distanceScore = distanceMin / distanceMax;
            }

            float angleDitance1 = angleMax - angleMin;
            float angleDitance2 = 360 - angleDitance1;
            float angleScore = 1 - (Mathf.Min(angleDitance1, angleDitance2) / 180);

            score = score * (i / (i + 1f)) + (distanceScore + angleScore) / 2 * (1f / (i + 1));
        }

        // 如果长度超过公差范围，就要考虑调整score
        if ((maxGesturePoints / minGesturePoints) > (1f+ lengthTorrence))
        {
            int deltaGesturePoints = Mathf.RoundToInt(maxGesturePoints - minGesturePoints * (1f + lengthTorrence));
            score = score * (minGesturePoints / (minGesturePoints + deltaGesturePoints));
        }

        return score;
    }

    public void ResetGesture()
    {
        this.gesturePointOffsetList.Clear();
    }
}