using System;
using UnityEngine;
using UnityEngine.UI;

public class ShootCheck : MonoBehaviour
{
    float[] accList = new float[30];
    int dataCount = 0;
    float gravity = 0;
    float maxAcc = 0;
    bool hasReachShootThreshold = false;
    bool locked = false;
    int hitCount = 0;
    [SerializeField] Text text;
    public float shootSpeed;
    public static ShootCheck ins; 

    void Start()
    {
        ins = this;
        // BluetoothClient.onDataReceived = OnDataReceived;
    } 

    void OnDestroy()
    {
        ins = null;
    }

    float[] ays = new float[4];
    public void OnDataReceived(byte[] bytes) {
        ays[0] = ToAcceleratedSpeed(bytes[7], bytes[8]);
        ays[1] = ToAcceleratedSpeed(bytes[17], bytes[18]);
        ays[2] = ToAcceleratedSpeed(bytes[27], bytes[28]);
        ays[3] = ToAcceleratedSpeed(bytes[37], bytes[38]);
        foreach (float ay in ays)
        {
            try 
            {
                if (ins.check(ay))
                {
                    if (ArmBow.ins != null)
                    {
                        ArmBow.ins.ADS_fire();        
                    }
                }
            } 
            catch (Exception e)
            {
                Debug.Log(e.Message);
            }      
        }
    }

    float ToAcceleratedSpeed(byte b1, byte b2)
    {
        int value = TwoByteToInt(b1, b2);
        return (float)value / 32768 * 16;
    }
    
    int TwoByteToInt(byte b1, byte b2)
    {
        ushort twoByte = (ushort)(b1 * 256 + b2);
        short shortNum = (short)twoByte;
        return (int)shortNum;
    }

    int afterReachShootFrameCount = 0;
    int steadyFrameCount = 6;
    bool check(float acc)
    {
        DebugLine.show(acc);
        DebugLine.showSteady(gravity);
        for (int i = accList.Length - 1; i > 0; i--)
        {
            accList[i] = accList[i - 1];
        }
        accList[0] = acc;
        dataCount++;
        if (locked) 
        {
            return false;
        }
        if (hasReachShootThreshold) {
            if (acc <= gravity) {
                hitCount++;
                shootSpeed = maxAcc - gravity;
                Log("第" + hitCount + "次识别射箭\n过滤正轴重力" + gravity.ToString("#0.000") + "后\n所得最大加速度峰值" + (maxAcc - gravity).ToString("#0.000") + "\n有效帧数" + afterReachShootFrameCount);
                maxAcc = 0;
                afterReachShootFrameCount = 0;
                hasReachShootThreshold = false;
                Dolock();
                Invoke("Unlock", 0.8f);
                return true;
            } else if (acc > maxAcc) {
                maxAcc = acc;
            }
            afterReachShootFrameCount++;
            if (afterReachShootFrameCount >= 20)
            {
                maxAcc = 0;
                afterReachShootFrameCount = 0;
                hasReachShootThreshold = false;
                Log("不符合短时间爆发加速");
            }
            return false;
        }
        if (dataCount > steadyFrameCount)
        {
            float totalAcc = 0;
            for (int i = 0; i < steadyFrameCount; i++)
            {
                totalAcc += accList[i];
            }
            float rangeAcc = totalAcc / steadyFrameCount;
            float squareAcc = 0;
            for (int i = 0; i < steadyFrameCount; i++)
            {
                squareAcc += (float) Mathf.Pow(accList[i] - rangeAcc, 2);
            }
            squareAcc /= steadyFrameCount;
            if (squareAcc < 0.00012)
            {
                gravity = Mathf.Clamp(rangeAcc, -0.981f, 0.981f);
            } 
            if (acc - gravity > 3)
            {
                // for (int i = 1; i < dataCount && i < 15; i++)
                // {
                //     if (accList[i] - gravity < - 1)
                //     {
                //         Dolock();
                //         Invoke("Unlock", 0.2f);
                //         return false;
                //     }
                // }
                hasReachShootThreshold = true;
                maxAcc = acc;
            }
        }
        return false;
    }

    void Dolock() 
    {
        this.locked = true;
    }

    void Unlock()
    {
        this.locked = false;
    }
    
    void Log(string text)
    {
        if (this.text != null)
        {
            this.text.text = text;
        } else {
            Debug.Log(text);
        }
    }
}