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/*************************************************************************
* (C) 2011 AITNET ltd - Sofia/Bulgaria - <misho@aitnet.org>
*  by Michael Pounov <misho@elwix.org>
*
* $Author: misho $
* $Id: array.c,v 1.6 2019/01/21 11:57:13 misho Exp $
*
**************************************************************************
The ELWIX and AITNET software is distributed under the following
terms:

All of the documentation and software included in the ELWIX and AITNET
Releases is copyrighted by ELWIX - Sofia/Bulgaria <info@elwix.org>

Copyright 2004 - 2019
	by Michael Pounov <misho@elwix.org>.  All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
3. All advertising materials mentioning features or use of this software
   must display the following acknowledgement:
This product includes software developed by Michael Pounov <misho@elwix.org>
ELWIX - Embedded LightWeight unIX and its contributors.
4. Neither the name of AITNET nor the names of its contributors
   may be used to endorse or promote products derived from this software
   without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY AITNET AND CONTRIBUTORS ``AS IS'' AND
ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
SUCH DAMAGE.
*/
#include "global.h"


/*
 * array_Init() - Create and initialize dynamic array
 *
 * @numItems = Number of Items
 * return: NULL error, != NULL allocated memory for array
 */
array_t *
array_Init(int numItems)
{
	array_t *arr = NULL;

	arr = e_malloc(sizeof(array_t));
	if (!arr)
		return NULL;

	arr->arr_last = -1;
	arr->arr_num = numItems;
	arr->arr_data = e_calloc(array_Size(arr), sizeof(intptr_t));
	if (!arr->arr_data) {
		e_free(arr);
		return NULL;
	} else
		array_Zero(arr);

	return arr;
}

/*
 * array_From() - Create and fill array from array with pointers
 *
 * @pargv = Array with pointers
 * @argc = Number of Items, if 0 walk through argv and stop when reach NULL item
 * return: NULL error, != NULL allocated new array
 */
array_t *
array_From(const char *** __restrict pargv, int argc)
{
	array_t *arr = NULL;
	const char **a = NULL;
	register int num = 0;

	if (!pargv || !*pargv || argc < 0)
		return NULL;

	if (argc)
		num = argc;
	else
		for (a = *pargv; *a; a++, num++);

	arr = array_Init(num);
	if (!arr)
		return NULL;
	else {
		memcpy(arr->arr_data, *pargv, array_Size(arr) * sizeof(intptr_t));
		arr->arr_last = array_Size(arr) - 1;
	}

	return arr;
}

/*
 * array_To() - Create and fill array with pointers from dynamic array
 *
 * @arr = Array
 * return: NULL error, != NULL allocated memory for array, NULL terminated
 */
char **
array_To(array_t * __restrict arr)
{
	char **args = NULL;

	if (!arr || !array_Size(arr))
		return NULL;

	args = (char **) e_calloc(array_Size(arr) + 1, sizeof(char*));
	if (!args)
		return NULL;
	else
		memcpy(args, arr->arr_data, array_Size(arr) * sizeof(char*));
	args[array_Size(arr)] = NULL;

	return args;
}

/*
 * array_Free() - Free all data in dynamic array items
 *	(WARNING! If assign static array dont use this!!!)
 *
 * @arr = Array
 * return: none
 */
void
array_Free(array_t * __restrict arr)
{
	register int i;

	if (!arr)
		return;

	for (i = 0; i < array_Size(arr); i++)
		if (arr->arr_data[i]) {
			e_free(arr->arr_data[i]);
			arr->arr_data[i] = NULL;
		}

	arr->arr_last = -1;
}

/*
 * array_Destroy() - Free and destroy dynamic array
 *
 * @parr = Array
 * return: none
 */
void
array_Destroy(array_t ** __restrict parr)
{
	if (!parr || !*parr)
		return;

	if ((*parr)->arr_data)
		e_free((*parr)->arr_data);
	e_free(*parr);
	*parr = NULL;
}

/*
 * array_Reset() - Reset array to initial state
 *
 * @parr = Array
 * @purge = Purge data, if <>0 then will be free entire data memory
 * return: none
 */
void
array_Reset(array_t * __restrict arr, int purge)
{
	if (!arr)
		return;

	arr->arr_last = -1;
	arr->arr_num = 0;

	if (purge && arr->arr_data) {
		e_free(arr->arr_data);
		arr->arr_data = e_calloc(array_Size(arr), sizeof(intptr_t));
	}

	array_Zero(arr);
}

/*
 * array_Len() - Get last used element in dynamic array (array Length)
 *
 * @arr = Array
 * return: -1 empty or >-1 position of last used element
 */
int
array_Len(array_t * __restrict arr)
{
	register int i;

	if (!arr)
		return -1;

	for (i = array_Size(arr); i && !arr->arr_data[i - 1]; i--);

	return --i;
}

/*
 * array_Grow() - Grow/Shrink dynamic array, Use with care when it shrink!!!
 *
 * @arr = Array
 * @newNumItems = Number of Items
 * @freeShrink = Free elements before shrink array
 * return: -1 error, 0 ok
 */
int
array_Grow(array_t * __restrict arr, int newNumItems, int freeShrink)
{
	void **data;
	int n = 0;
	register int i;

	if (!arr)
		return -1;

	if (arr->arr_num == newNumItems)
		return 0;
	if (array_Size(arr) < newNumItems) {
		n = newNumItems - array_Size(arr);
	} else if (freeShrink)
		for (i = newNumItems; i < arr->arr_num; i++)
			if (arr->arr_data[i])
				e_free(arr->arr_data[i]);

	arr->arr_num = newNumItems;
	if (array_Size(arr)) {
		data = e_realloc(arr->arr_data, array_Size(arr) * sizeof(intptr_t));
		if (!data)
			return -1;
		else
			arr->arr_data = data;

		memset(arr->arr_data + (array_Size(arr) - n), 0, n * sizeof(intptr_t));
		arr->arr_last = array_Len(arr);
	} else {
		if (arr->arr_data)
			e_free(arr->arr_data);
		arr->arr_data = NULL;
		arr->arr_last = -1;
	}

	return 0;
}

/*
 * array_Vacuum() - Vacuum dynamic array, empty elements will be deleted
 *
 * @arr = Array
 * @fromWhere = 1 begin, 2 ALL empty elements
 * return: -1 error, 0 ok
 */
int
array_Vacuum(array_t * __restrict arr, int fromWhere)
{
	register int i, j, num;
	int cx = 0;

	if (!arr)
		return -1;
	else
		fromWhere &= 0x7;

	num = array_Size(arr);
#ifdef VACUUM_RIGHT
	if (fromWhere & VACUUM_RIGHT) {
		for (cx = 0, i = num - 1; i && !arr->arr_data[i]; i--, cx++);
		num -= cx;
	}
#endif
	if (fromWhere & VACUUM_LEFT) {
		for (i = 0; i < num && !arr->arr_data[i]; i++);
		if (i) {
			memmove(arr->arr_data, arr->arr_data + i, (num - i) * sizeof(intptr_t));
			memset(arr->arr_data + (num - i), 0, i * sizeof(intptr_t));

			num -= i;
			cx += i;
		}
	}
	if (fromWhere & VACUUM_BETWEEN) {
		for (i = 0; i < num; i++) {
			if (arr->arr_data[i])
				continue;

			for (j = i; j < num && !arr->arr_data[j]; j++);

			memmove(arr->arr_data + i, arr->arr_data + j, (num - j) * sizeof(intptr_t));
			memset(arr->arr_data + i + (num - j), 0, (j - i) * sizeof(intptr_t));

			num -= j - i;
			cx += j - i;
		}
	}

	arr->arr_last = array_Len(arr);
	return cx;
}

/*
 * array_Concat() Concat source array to destination array
 *
 * @dest = Destination array
 * @src = Source array
 * return: -1 error; >0 new count of destination array
 */
int
array_Concat(array_t * __restrict dest, array_t * __restrict src)
{
	int n;

	if (!dest || !src)
		return -1;

	n = array_Size(dest);
	if (array_Grow(dest, n + array_Size(src), 0))
		return -1;
	memcpy(dest->arr_data + n, src->arr_data, array_Size(src) * sizeof(intptr_t));

	dest->arr_last = array_Len(dest);
	return array_Size(dest);
}

/*
 * array_Copy() Copy source array to destination array
 *
 * @dest = Destination array, after use free with array_Destroy()
 * @src = Source array
 * return: -1 error; >0 count of destination array
 */
int
array_Copy(array_t ** __restrict dest, array_t * __restrict src)
{
	if (!dest || !src)
		return -1;

	*dest = array_Init(array_Size(src));
	if (!*dest)
		return -1;
	else
		(*dest)->arr_last = src->arr_last;

	memcpy((*dest)->arr_data, src->arr_data, array_Size(*dest) * sizeof(intptr_t));
	return array_Size(*dest);
}

/*
 * array_Elem() - Always GET/PUT element into dynamic array, if not enough elements grow array
 *
 * @arr = Array
 * @n = Position
 * @data = Element, if set NULL GET element at position or !=NULL PUT element at position
 * return: -1 error or !=-1 return element at position
 */
void *
array_Elem(array_t * __restrict arr, int n, void *data)
{
	void *dat = NULL;

	if (!arr)
		return (void*) -1;

	if (n >= array_Size(arr) && array_Grow(arr, n + 1, 0))
		return (void*) -1;

	dat = array_Get(arr, n);
	if (data)
		array_Set(arr, n, data);

	return dat;
}

/*
 * array_Push() - Push element into dynamic array like stack manner, place at first empty position
 *
 * @arr = Array
 * @data = Element, if set NULL return only first empty position
 * @nogrow = Don't grow array if not enough space
 * return: -1 not found empty position, array is full!, >-1 return position of stored element into array
 */
int
array_Push(array_t * __restrict arr, void *data, int nogrow)
{
	int ret = -1;

	if (!arr)
		return -1;
	else
		ret = array_Last(arr) + 1;
	if (nogrow && ret >= array_Size(arr))
		return -1;
	if (!nogrow && ret >= array_Size(arr) && array_Grow(arr, ret + 1, 0))
		return -1;

	ret = ++arr->arr_last;
	arr->arr_data[arr->arr_last] = data;

	return ret;
}

/*
 * array_Pop() - Pop element from dynamic array like stack manner, last used position
 *
 * @arr = Array
 * @data = Element, if set NULL return only last used position
 * @nodel = Don't delete after Pop element
 * return: -1 not found used position, array is empty!, >-1 return element position
 */
int
array_Pop(array_t * __restrict arr, void ** __restrict data, int nodel)
{
	int ret = -1;

	if (!arr)
		return -1;

	if ((ret = array_Last(arr)) != -1) {
		if (data)
			*data = arr->arr_data[arr->arr_last];
		if (!nodel)
			arr->arr_data[arr->arr_last] = NULL;
		arr->arr_last--;
	}

	return ret;
}

/*
 * array_Args() Parse and make array from arguments ... (input string will be modified!!! 
 *	and output array must be free with array_Destroy() after use!)
 *
 * @psArgs = Input arguments line, after execute string is modified!!!
 * @nargs = Maximum requested count of arguments from input string psArgs, if 0 all psArgs
 * @csDelim = Delimiter(s) for separate
 * @parr = Output array of arguments ... (must be free with array_Destroy() after use!)
 * return: 0 error format; -1 error:: can`t read; >0 ok, number of readed items
 */
int
array_Args(char * __restrict psArgs, int nargs, const char *csDelim, array_t ** __restrict parr)
{
	char **app;
	register int i;

	if (!psArgs || !csDelim || !parr)
		return -1;

	if (nargs)
		i = nargs;
	else
		i = str_ArgsNum(psArgs, csDelim);

	*parr = array_Init(i);
	if (!*parr)
		return -1;

	for (i = 0, app = (char**) (*parr)->arr_data; 
			app < (char**) (*parr)->arr_data + (*parr)->arr_num && 
			(*app = strsep((char **) &psArgs, csDelim)); 
		       	**app ? i++ : i, **app ? app++ : app);

	(*parr)->arr_last = i - 1;
	return i;
}