#ifndef HEHE_ARRAYLIB
#define HEHE_ARRAYLIB

#include <stddef.h>
#include <stdlib.h>
#include <string.h>

struct HeheArray {
	size_t type_size;
	size_t len;
	size_t max_len;
	void *content;
};

static void *hehe_alloc_array(size_t initial_len, size_t type_size) {
	if(initial_len == 0) initial_len = 1;
	struct HeheArray *array = malloc(sizeof(*array));
	array->len = initial_len;
	size_t max_len = 1;
	while(initial_len >>= 1) max_len <<= 1;

	array->type_size = type_size;
	array->max_len = max_len;
	array->content = malloc(max_len * type_size);
	memset(array->content, 0, max_len * type_size);
	return array;
}

static void hehe_array_set(struct HeheArray *array, size_t index, const void *value) {
	if(index >= array->max_len) {
		array->content = realloc(array->content, (array->max_len << 1) * array->type_size);
		memset(array->content + array->max_len * array->type_size, 0, array->max_len * array->type_size);
		array->max_len <<= 1;
	}
	if(index >= array->len) array->len = index + 1;
	memcpy(array->content + index * array->type_size, value, array->type_size);
}

static void *hehe_array_get(struct HeheArray *array, size_t index) {
	if(index >= array->len) return NULL; // is ur fault
	return array->content + array->type_size * index;
}

static int hehe_array_copy(struct HeheArray *array, size_t index, void *value) {
	if(index >= array->len) return -1; // is ur fault
	memcpy(value, array->content + array->type_size * index, array->type_size);
	return 0;
}

static void hehe_array_set_len(struct HeheArray *array, size_t new_len) {
	if(new_len >= array->max_len) {
		size_t new_max_len = 1;
		size_t len = new_len;
		while(len >>= 1) new_max_len <<= 1;
		array->content = realloc(array->content, new_max_len * array->type_size);
		memset(array->content + array->max_len * array->type_size, 0, (new_max_len - array->max_len) * array->type_size);
		array->max_len <<= 1;		
	}
	array->len = new_len;
}

static void hehe_array_push(struct HeheArray *array, const void *value) {
	hehe_array_set(array, array->len, value);
}

static int hehe_array_pop(struct HeheArray *array, void *value) {
	return hehe_array_copy(array, array->len, value) || ((array->len -= 1) && 0);
}

static struct HeheArray *hehe_array_yoink(struct HeheArray *array, size_t start_index, size_t len) {
	if(start_index + len >= array->len) return NULL;
	struct HeheArray *ret = hehe_alloc_array(len, array->type_size);
	memcpy(ret->content, array->content + start_index * array->type_size, len * array->type_size);
	memmove(array->content + start_index * array->type_size, array->content + (start_index + len) * array->type_size, (array->len - len - start_index) * array->type_size);
	hehe_array_set_len(array, array->len - len);
	return ret;
}

static void hehe_array_free(struct HeheArray *array) {
	free(array->content);
	free(array);
}

#endif