/*
 * Types Wanted:
 *      Char
 *      Float
 *      Int
 *      String
 */
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

typedef struct
{
	char* arr;
	size_t size;
} Vec8_t;

Vec8_t
create(size_t init_size)
{
	Vec8_t vec = { .arr = nullptr, .size = 0 };
	if (init_size > 0)
	{
                vec.arr = malloc(init_size * sizeof(char));
		vec.size = init_size;
	}
	return vec;
}

void
delete(Vec8_t* vec)
{
	if (vec->arr != nullptr)
	{
		free(vec->arr);
	}
	vec->arr = nullptr;
}


char
at(Vec8_t* vec, int idx)
{
	if (vec->arr != nullptr && vec->size >= idx)
	{
		return vec->arr[idx];
	}
	return -1;
}

void
print_vec(Vec8_t* vec) {
        for(int i = 0; i < vec->size; i++) {
                printf("%c ", at(vec, i));
        }
        printf("\n");
}

int
begin(Vec8_t* vec)
{
	if (vec->arr != nullptr && vec->size > 0)
	{
		return 1;
	}
	return -1;
}

int
end(Vec8_t* vec)
{
	if (vec->arr != nullptr && vec->size > 0)
	{
		return (int)(vec->size - 1);
	}
	return -1;
}

char
front(Vec8_t* vec)
{
	if (vec->arr != nullptr && vec->size > 0)
	{
		return vec->arr[0];
	}
	return -1;
}

char
back(Vec8_t* vec)
{
	if (vec->arr != nullptr && vec->size > 0)
	{
		return vec->arr[vec->size - 1];
	}
	return -1;
}

Vec8_t
add_back(Vec8_t* vec, char val)
{
	Vec8_t nvec = create(vec->size + 1);
	memcpy(&nvec.arr[0], &vec->arr[0], vec->size * sizeof(char));
	if (nvec.arr && (nvec.size > 0 || nvec.size > vec->size))
	{
		nvec.arr[vec->size] = val;
	}
	return nvec;
}

Vec8_t
add_front(Vec8_t* vec, char val)
{
	Vec8_t nvec = create(vec->size + 1);
	memcpy(&nvec.arr[1], &vec->arr[0], vec->size * sizeof(char));
	if (nvec.arr && (nvec.size > 0 || nvec.size > vec->size))
	{
		nvec.arr[0] = val;
	}
	return nvec;
}

int
main()
{
	Vec8_t vec = create(0);
	vec = add_back(&vec, '3');
	vec = add_back(&vec, '4');
	vec = add_back(&vec, '5');
	vec = add_back(&vec, '6');
        print_vec(&vec);
	vec = add_front(&vec, 'c');
        print_vec(&vec);

	delete(&vec);
	return 0;
}