#include "darray.h"

#include "debug.h"

DArray::DArray(size_t data_size, size_t init_size)
{
	int i;

	if (init_size <= 0)
	{
		goto error;
	}

	this->_max = init_size;
	this->data = (void **)malloc(init_size*sizeof(void *));
	this->end = 0;
	//this->size = data_size;
	this->_expand = DEFAULT_EXPAND_RATE;


error:;
}

DArray::~DArray()
{

}

int DArray::push(void *val)
{
	if (this->data[this->end] != NULL)
	{
		ENL();
	}

	this->data[this->end] = val;
	this->end++;

	if (this->end > this->_max)
	{
		return this->expand();
	}

	return 0;
}

int DArray::expand()
{
	size_t old_max = this->_max;

	if (this->resize(this->_max + DEFAULT_EXPAND_RATE))
	{
		goto error;
	}

	memset(this->data + old_max, 0, this->_expand+1);
	return 0;

error:
	ENL();
	return -1;
}

int DArray::resize(size_t size)
{
	int i = 0;
	void *data = NULL;

	if (size < 1)
	{
		ENL();
		goto error;
	}

	if (size < this->_max)
	{
		i = this->_max;
		do 
		{
			if (this->data[i-1] != NULL)
			{
				free(this->data[i-1]);//??? is there is some data then free it?
				this->data[i-1] = NULL;
			}
			i -= 1;
		} while (i-1 == size);
	}
	this->_max = size;

	data = (void **)realloc(this->data, this->_max * sizeof(void*));
	if (data == NULL)
	{
		ENL();
		goto error;
	}

	this->data = (void **)data;
	return 0;

error:
	ERROR("\n");
	return -1;
}

int DArray::set(int idx, void *val)
{
	if (idx > this->_max)
	{
		ENL();
		return -1;
	}

	if (idx>this->end)
	{
		this->end = idx;
	}

	this->data[idx] = val;

	return 0;
}

void* DArray::get(int idx)
{
	if (idx<0)
	{
		return NULL;
	}

	if (idx>=this->end)
	{
		return NULL; //???
	}

	return this->data[idx];
}

int DArray::count()
{
	return this->end;
}