#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <stdbool.h>
#include <ctype.h>

#define AND 0
#define OR 1
#define XOR 2
#define NOT 3

struct Logic_Element {
    int ID;
    int *input_ids;
    int *input_types;
    int kind;
    int nr_inputs;
    bool output;
};

struct Sub_System {
    int nr_elements;
    int nr_inputs;
    struct  Logic_Element *elements_pointer;
};

typedef struct Logic_Element Logic_Element;
typedef struct Sub_System Sub_System;

bool test(int nr_inputs,int kind)
{
    bool return_value;
    switch(kind)
    {
        case 0:
        {
            return_value = true;
            break;
        }
    }
    return return_value;
}

void show_help(int code)
{
    switch (code)
    {
        case 0:
        {
            printf("supported gate types:\n"
                   "AND (return True only if all inputs are True)\n"
                   "OR (returns False only if all inputs are False)\n"
                   "NOT(returns True if input is False, "
                   "and returns False if input is True)\n"
                   "XOR (returns True only is exactly 1 input is True)\n");
            break;
        }
    }
}

bool check_element_type_input(char* str, Logic_Element * element_pointer)
{
    if(!strcmp(str,"help"))
    {
        show_help(0);
        return false;
    }
    else if(!strcmp(str,"AND"))
    {
        element_pointer->kind = AND;
        return true;
    }
    else if(!strcmp(str,"OR"))
    {
        element_pointer->kind = OR;
        return true;
    }
    else if(!strcmp(str,"NOT"))
    {
        element_pointer->kind = NOT;
        return true;
    }
    else if(!strcmp(str,"XOR"))
    {
        element_pointer->kind = XOR;
        return true;
    }
    else {
        printf("Invalid input");
        return false;
    }
}

Sub_System* build_ssystem()
{
    unsigned int nr;
    Sub_System *ssystem = (Sub_System*)malloc( sizeof(Sub_System) );

    char str[10];
    printf("enter number of inputs needed for sub system: ");
    fgets(str, sizeof(str), stdin);
    scanf("%d",&(*ssystem).nr_inputs);
    printf("enter number of elements needed for sub system: ");
    scanf("%d",&(*ssystem).nr_elements);
    nr = ssystem->nr_elements;

    ssystem->elements_pointer = (Logic_Element*)malloc(sizeof(Logic_Element)*nr);

    for(unsigned int i = 0; i < ssystem->nr_elements; i++)
    {
        bool done = false;
        while(!done) {
            printf("enter kind of element, type 'help' for info\n");
            fgets(str, sizeof(str), stdin);
            done = check_element_type_input(str, &(ssystem->elements_pointer[i]) );
        }

        if(ssystem->elements_pointer[i].kind != NOT)
        {
            printf("enter number of inputs this element has\n");
            scanf("%d", &(ssystem->elements_pointer[i].nr_inputs));

            int num_inputs = ssystem->elements_pointer[i].nr_inputs;
            int* ids   = (int*)malloc( sizeof(int)*num_inputs );
            int* types = (int*)malloc( sizeof(int)*num_inputs );
            ssystem->elements_pointer[i].input_ids = ids;
            ssystem->elements_pointer[i].input_types = types;

            printf("For each of the inputs, enter the ID of the element it is"
                   "connected to. The ID equal the order in which the elements "
                   "are added.\n to connect the gate input to a sub system "
                   "input, type 'o' followed by the nr of the input.\n for "
                   " example o1 would connect the gate input to sub system "
                   " input 1.\n");
            for(int j = 0; j < num_inputs; j++)
            {
                    printf("input %d: ",j);
                    fgets(str, sizeof(str), stdin);

                    ssystem->elements_pointer[i].input_ids[0] = 1;
                    ssystem->elements_pointer[i].input_types[0] = str[0];
            }
        }
    }

    for(int i = 0; i < ssystem->nr_elements; i++)
    {
        Logic_Element element = ssystem->elements_pointer[i];
        printf("element %d:\t kind: %d \t nr inputs: %d\n",
               i, element.kind, element.nr_inputs);
        for(int j = 0; j < element.nr_inputs; j++)
        {
            printf("%d\t%d\t",
                ssystem->elements_pointer[j].input_types[j],
                ssystem->elements_pointer[j].input_types[j]);
        }
        printf("\n");
    }
    return ssystem;
}

int main()
{
    printf("Welkom \n");
    Sub_System *testt=build_ssystem();
    printf("%d",test(0,0));
}