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

/* 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 GestureController
{
    // Start is called once before the first execution of Update after the MonoBehaviour is created
    private List<GesturePointOffset> gesturePointOffsetList = new List<GesturePointOffset>();
    public int sampleRate { private 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

    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)
    {
        var data = JsonConvert.DeserializeObject<Dictionary<string, string>>(json);
        this.sampleRate = int.Parse(data["sample_rate"]);
        gesturePointOffsetList.Clear();
        GesturePointOffset[] pointOffsets = JsonConvert.DeserializeObject<GesturePointOffset[]>(data["points"]);
        foreach (var point in pointOffsets)
        {
            gesturePointOffsetList.Add(point);
        }
    }

    // 添加一个运动轨迹
    public void AddGesturePoint(Vector2 pointLoc)
    {
        if (gesturePointOffsetList.Count == 0)
        {
            prePointLoc = pointLoc;
            curPointLoc = pointLoc;
            GesturePointOffset gesturePointMovement = new GesturePointOffset(0, 0);
            gesturePointOffsetList.Add(gesturePointMovement);
            return;
        }
        else
        {
            curPointLoc = pointLoc;
            float distance = Vector2.Distance(prePointLoc, curPointLoc);
            float angle = Vector2.Angle(prePointLoc, curPointLoc);
            GesturePointOffset gesturePointMovement = new GesturePointOffset(distance, angle);
            gesturePointOffsetList.Add(gesturePointMovement);
            prePointLoc = curPointLoc;
        }
    }

    public float CompareGesture(GestureController 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 ditanceMin = Mathf.Min(this.gesturePointOffsetList[i].distance - anotherGesture.gesturePointOffsetList[i].distance);
            float ditanceMax = Mathf.Max(this.gesturePointOffsetList[i].distance - anotherGesture.gesturePointOffsetList[i].distance);
            float distanceScore = ditanceMin / ditanceMax;

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

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

        // 如果长度超过20%，就要考虑调整score
        if ((maxGesturePoints / minGesturePoints) > 1.2f)
        {
            int deltaGesturePoints = Mathf.RoundToInt(maxGesturePoints - minGesturePoints * 1.2f);
            score = score * (minGesturePoints / (minGesturePoints + deltaGesturePoints));
        }

        return score;
    }
}