#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "randomness.h"
#include "neurons.h"
#include "activations.h"

Neuron *init_neuron(int n_weights, char *activation_function)
{
    Neuron *neuron = (Neuron*)malloc(sizeof(Neuron));
    if(n_weights == 0)
    {
        neuron->weights = NULL;
    }else
    {
        neuron->weights = (float*)malloc(n_weights*sizeof(float));
        int i;
        for(i=1 ; i<=n_weights ; i++)
        {
            neuron->weights[i] = random_float(0.0 , 1.0);
        }
    }
    neuron->bias = random_float(0.0 , 1.0);
    neuron->output = 0.0;
    if(strcmp(activation_function, "nothing") == 0)
    {
        //to be completed later with tanh, relu, etc : for now only sigmoid is supported and will be the default function
    }
    else
    {
        neuron->activation = sigmoid;
        neuron->activation_derivative = sigmoid_derivative;
    }
    neuron->delta_error = 0.0;
    neuron->same_layer_next_neuron = NULL;

    return neuron;
}

void destroy_neuron(Neuron *neuron)
{
    if(neuron->weights != NULL)
    {
        free(neuron->weights);
    }
    free(neuron);
}