/*
   +----------------------------------------------------------------------+
   | Copyright © The PHP Group and Contributors.                          |
   +----------------------------------------------------------------------+
   | This source file is subject to the Modified BSD License that is      |
   | bundled with this package in the file LICENSE, and is available      |
   | through the World Wide Web at <https://www.php.net/license/>.        |
   |                                                                      |
   | SPDX-License-Identifier: BSD-3-Clause                                |
   +----------------------------------------------------------------------+
   | Authors: Hans-Peter Oeri (University of St.Gallen) <hp@oeri.ch>      |
   +----------------------------------------------------------------------+
 */

extern "C" {
#include <php.h>
#include <zend.h>
#include <zend_API.h>
}

#include "resourcebundle/resourcebundle.h"
#include "resourcebundle/resourcebundle_class.h"
#include "resourcebundle/resourcebundle_iterator.h"

/*
 * Although libicu offers iterator functions, they are not used here: libicu does iterate
 * irrespective of array indices. Those cannot be recreated afterwards. Arrays as well as tables
 * can however be accessed by numerical index, with table keys readable ex post.
 */

/* {{{ resourcebundle_iterator_read */
static void resourcebundle_iterator_read( ResourceBundle_iterator *iterator )
{
	UErrorCode icuerror = U_ZERO_ERROR;
	ResourceBundle_object *rb = iterator->subject;

	rb->child = ures_getByIndex( rb->me, iterator->i, rb->child, &icuerror );

	if (U_SUCCESS(icuerror)) {
		/* ATTN: key extraction must be the first thing to do... rb->child might be reset in read! */
		if (iterator->is_table) {
			iterator->currentkey = estrdup( ures_getKey( rb->child ) );
		}
		resourcebundle_extract_value( &iterator->current, rb );
	}
	else {
		ZVAL_UNDEF(&iterator->current);
	}
}
/* }}} */

/* {{{ resourcebundle_iterator_invalidate */
static void resourcebundle_iterator_invalidate( zend_object_iterator *iter )
{
	ResourceBundle_iterator *iterator = (ResourceBundle_iterator *) iter;

	if (!Z_ISUNDEF(iterator->current)) {
		zval_ptr_dtor( &iterator->current );
		ZVAL_UNDEF(&iterator->current);
	}
	if (iterator->currentkey) {
		efree( iterator->currentkey );
		iterator->currentkey = NULL;
	}
}
/* }}} */

/* {{{ resourcebundle_iterator_dtor */
static void resourcebundle_iterator_dtor( zend_object_iterator *iter )
{
	ResourceBundle_iterator *iterator = (ResourceBundle_iterator *) iter;
	zval                    *object = &iterator->intern.data;

	resourcebundle_iterator_invalidate( iter );

	zval_ptr_dtor(object);
}
/* }}} */

/* {{{ resourcebundle_iterator_has_more */
static zend_result resourcebundle_iterator_has_more( zend_object_iterator *iter )
{
	ResourceBundle_iterator *iterator = (ResourceBundle_iterator *) iter;
	return (iterator->i < iterator->length) ? SUCCESS : FAILURE;
}
/* }}} */

/* {{{ resourcebundle_iterator_current */
static zval *resourcebundle_iterator_current( zend_object_iterator *iter )
{
	ResourceBundle_iterator *iterator = (ResourceBundle_iterator *) iter;
	if (Z_ISUNDEF(iterator->current)) {
		resourcebundle_iterator_read( iterator);
	}
	return &iterator->current;
}
/* }}} */

/* {{{ resourcebundle_iterator_key */
static void resourcebundle_iterator_key( zend_object_iterator *iter, zval *key )
{
	ResourceBundle_iterator *iterator = (ResourceBundle_iterator *) iter;

	if (Z_ISUNDEF(iterator->current)) {
		resourcebundle_iterator_read( iterator);
	}

	if (iterator->is_table) {
		ZVAL_STRING(key, iterator->currentkey);
	} else {
		ZVAL_LONG(key, iterator->i);
	}
}
/* }}} */

/* {{{ resourcebundle_iterator_step */
static void resourcebundle_iterator_step( zend_object_iterator *iter )
{
	ResourceBundle_iterator *iterator = (ResourceBundle_iterator *) iter;

	iterator->i++;
	resourcebundle_iterator_invalidate( iter );
}
/* }}} */

/* {{{ resourcebundle_iterator_has_reset */
static void resourcebundle_iterator_reset( zend_object_iterator *iter )
{
	ResourceBundle_iterator *iterator = (ResourceBundle_iterator *) iter;

	iterator->i = 0;
	resourcebundle_iterator_invalidate( iter );
}
/* }}} */

/* {{{ resourcebundle_iterator_funcs */
static const zend_object_iterator_funcs resourcebundle_iterator_funcs = {
	resourcebundle_iterator_dtor,
	resourcebundle_iterator_has_more,
	resourcebundle_iterator_current,
	resourcebundle_iterator_key,
	resourcebundle_iterator_step,
	resourcebundle_iterator_reset,
	resourcebundle_iterator_invalidate,
	NULL, /* get_gc */
};
/* }}} */

/* {{{ resourcebundle_get_iterator */
U_CFUNC zend_object_iterator *resourcebundle_get_iterator( zend_class_entry *ce, zval *object, int byref )
{
	if (byref) {
		zend_throw_error(NULL, "An iterator cannot be used with foreach by reference");
		return NULL;
	}

	ResourceBundle_object   *rb = Z_INTL_RESOURCEBUNDLE_P(object );
	ResourceBundle_iterator *iterator = reinterpret_cast<ResourceBundle_iterator *>(emalloc( sizeof( ResourceBundle_iterator )) );

	zend_iterator_init(&iterator->intern);
	Z_ADDREF_P(object);
	ZVAL_OBJ(&iterator->intern.data, Z_OBJ_P(object));
	iterator->intern.funcs = &resourcebundle_iterator_funcs;

	iterator->subject = rb;

	/* The iterated rb can only be either URES_TABLE or URES_ARRAY
	 * All other types are returned as php primitives!
	 */
	iterator->is_table = (ures_getType( rb->me ) == URES_TABLE);
	iterator->length = ures_getSize( rb->me );

	ZVAL_UNDEF(&iterator->current);
	iterator->currentkey = NULL;
	iterator->i = 0;

	return (zend_object_iterator *) iterator;
}
/* }}} */
