using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;

public class Functions : MonoBehaviour
{
    public float theta;

    // Start is called before the first frame update
    void Start()
    {
        //Debug.Log("Sign " + Sign(15));
        //Debug.Log("Sign " + Sign(-15));
        //Debug.Log("Step " + Step(15));
        //Debug.Log("Step " + Step(-15));
        //Debug.Log("Sigmoid " + Sigmoid(15));
        //Debug.Log("Sigmoid " + Sigmoid(-15));
        //Quad(4.123456789f, 4.123456789f);
        float[] x = new float[3] { 0.1f, 0.5f, 0.8f };
        float[] w = new float[3] { 0.7f, 0.2f, 0.6f };
        Debug.Log("Step " + Step(Activate(x, w), 0.5f));

        x = new float[3] { 0.1f, 0.5f, 0.8f };
        w = new float[3] { 0.7f, 0.2f, 0.6f };
        Debug.Log("Sign " + Sign(Activate(x, w), 0.7f));

        x = new float[3] { 0.1f, 0.5f, 0.8f };
        w = new float[3] { 0.7f, 0.2f, 0.6f };
        Debug.Log("Sigmoid " + Sigmoid(Activate(x, w), -0.7f));

        x = new float[3] { 0.1f, 0.5f, 0.8f };
        w = new float[3] { 0.7f, 0.2f, 0.6f };
        Debug.Log("Liniear " + Liniear(Activate(x, w), 0.7f));

        x = new float[3] { 0.9f, 0.6f, 0.3f };
        w = new float[3] { -0.4f, 0.7f, -0.1f };
        Debug.Log("2nd Step " + Step(Activate(x, w), 0.2f));

        x = new float[3] { 0.9f, 0.6f, 0.3f };
        w = new float[3] { -0.4f, 0.7f, -0.1f };
        Debug.Log("2nd Sign " + Sign(Activate(x, w), 0.0f));

        x = new float[3] { 0.9f, 0.6f, 0.3f };
        w = new float[3] { -0.4f, 0.7f, -0.1f };
        Debug.Log("2nd Sigmoid " + Sigmoid(Activate(x, w), -0.0f));

        x = new float[3] { 0.9f, 0.6f, 0.3f };
        w = new float[3] { -0.4f, 0.7f, -0.1f };
        Debug.Log("2nd Liniear " + Liniear(Activate(x, w), 0.0f));
    }

    public float Activate(float[] x, float[] w)
    {
        float output = 0.0f;
        int n = x.Length;
        for (int i = 0; i < n; i++)
        {
            output += x[i] * w[i];
        }

        //Debug.Log("Activate " + output);

        return output;
    }

    public float Sign(float _x, float _theta)
    {
        if (_x >= _theta)
        {
            return 1.0f;
        }
        else
        {
            return -1.0f;
        }
    }

    public float Step(float _x, float _theta)
    {
        if (_x >= _theta)
        {
            return 1.0f;
        }
        else
        {
            return 0.0f;
        }
    }

    public float Liniear(float _x, float _theta)
    {
        return _x - _theta;
    }

    public float Sigmoid(float _x, float _theta)
    {
        return 1.0f / (1.0f + Mathf.Pow((float)Math.E, -(_x - _theta)));
    }

    public void Quad(float _g, float _f)
    {
        float a, b, c, x1, x2;

        int i = 0;
        bool check = true;
        while(check)
        {
            string ftext = _f.ToString();
            if (ftext.Contains(".") && ftext.IndexOf(".") >= ftext.Length - i) //delete the > sine if you want only 2 decimal places but don't delete it if you want also 1 decimal places.
            {
                Debug.Log("Has places: " + i);
                check = false;
            }

            if (i > 100) check = false;

            i++;
        }

        int f, g;

        g = 123456750;
        f = 123456747;
        a = g - f;
        b = 2.0f;
        c = 1.0f;

        a /= 10;

        Debug.Log(a);

        x1 = (-b - Mathf.Sqrt(b * b - 4 * a * c)) / (2 * a);
        x2 = (-b + Mathf.Sqrt(b * b - 4 * a * c)) / (2 * a);

        Debug.Log(x1);
        Debug.Log(x2);

        Debug.Log(((a * (x1 * x1)) + (b * x1) + c));
        Debug.Log(((a * (x2 * x2)) + (b * x2) + c));
    }
}