/*************************************************************************/
/*  dictionary.cpp                                                       */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                    http://www.godotengine.org                         */
/*************************************************************************/
/* Copyright (c) 2007-2017 Juan Linietsky, Ariel Manzur.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/
#include "dictionary.h"
#include "safe_refcount.h"
#include "variant.h"

struct _DictionaryVariantHash {

	static _FORCE_INLINE_ uint32_t hash(const Variant &p_variant)  { return p_variant.hash(); }
};





struct DictionaryPrivate {

	struct Data {
		Variant variant;
		int order;
	};

	SafeRefCount refcount;
	HashMap<Variant,Data,_DictionaryVariantHash> variant_map;
	int counter;
	bool shared;

};

struct DictionaryPrivateSort {

	bool operator()(const HashMap<Variant,DictionaryPrivate::Data,_DictionaryVariantHash>::Pair *A,const HashMap<Variant,DictionaryPrivate::Data,_DictionaryVariantHash>::Pair *B) const {

		return A->data.order < B->data.order;
	}
};

void Dictionary::get_key_list( List<Variant> *p_keys) const {

	if (_p->variant_map.empty())
		return;

	int count = _p->variant_map.size();
	const HashMap<Variant,DictionaryPrivate::Data,_DictionaryVariantHash>::Pair **pairs = (const HashMap<Variant,DictionaryPrivate::Data,_DictionaryVariantHash>::Pair**)alloca( count * sizeof(HashMap<Variant,DictionaryPrivate::Data,_DictionaryVariantHash>::Pair *) );
	_p->variant_map.get_key_value_ptr_array(pairs);

	SortArray<const HashMap<Variant,DictionaryPrivate::Data,_DictionaryVariantHash>::Pair*,DictionaryPrivateSort>  sort;
	sort.sort(pairs,count);

	for(int i=0;i<count;i++) {
		p_keys->push_back(pairs[i]->key);
	}

}

void Dictionary::_copy_on_write() const {

	//make a copy of what we have
	if (_p->shared)
		return;

	DictionaryPrivate *p = memnew(DictionaryPrivate);
	p->shared=_p->shared;
	p->variant_map=_p->variant_map;
	p->refcount.init();
	_unref();
	_p=p;
}

Variant& Dictionary::operator[](const Variant& p_key) {

	_copy_on_write();

	DictionaryPrivate::Data *v =_p->variant_map.getptr(p_key);

	if (!v) {

		DictionaryPrivate::Data d;
		d.order=_p->counter++;
		_p->variant_map[p_key]=d;
		v =_p->variant_map.getptr(p_key);

	}
	return v->variant;
}

const Variant& Dictionary::operator[](const Variant& p_key) const {

	return _p->variant_map[p_key].variant;

}
const Variant* Dictionary::getptr(const Variant& p_key) const {

	const DictionaryPrivate::Data *v =_p->variant_map.getptr(p_key);
	if (!v)
		return NULL;
	else
		return &v->variant;
}

Variant* Dictionary::getptr(const Variant& p_key) {

	_copy_on_write();	
	DictionaryPrivate::Data *v =_p->variant_map.getptr(p_key);
	if (!v)
		return NULL;
	else
		return &v->variant;


}

Variant Dictionary::get_valid(const Variant& p_key) const {

	DictionaryPrivate::Data *v =_p->variant_map.getptr(p_key);
	if (!v)
		return Variant();
	else
		return v->variant;
}


int Dictionary::size() const {

	return _p->variant_map.size();

}
bool Dictionary::empty() const {

	return !_p->variant_map.size();
}

bool Dictionary::has(const Variant& p_key) const {

	return _p->variant_map.has(p_key);
}

bool Dictionary::has_all(const Array& p_keys) const {
	for (int i=0;i<p_keys.size();i++) {
		if( !has(p_keys[i]) ) {
			return false;
		}
	}
	return true;
}

void Dictionary::erase(const Variant& p_key) {
	_copy_on_write();
	_p->variant_map.erase(p_key);
}

bool Dictionary::operator==(const Dictionary& p_dictionary) const {

	return _p==p_dictionary._p;
}

void Dictionary::_ref(const Dictionary& p_from) const {

	//make a copy first (thread safe)
	if (!p_from._p->refcount.ref())
		return; // couldn't copy

	//if this is the same, unreference the other one
	if (p_from._p==_p) {
		_p->refcount.unref();
		return;
	}
	if (_p)
		_unref();
	_p=p_from._p;

}

void Dictionary::clear() {

	_copy_on_write();
	_p->variant_map.clear();
	_p->counter=0;
}

bool Dictionary::is_shared() const {

    return _p->shared;
}


void Dictionary::_unref() const {

	ERR_FAIL_COND(!_p);
	if (_p->refcount.unref()) {
		memdelete(_p);
	}
	_p=NULL;

}
uint32_t Dictionary::hash() const {

	uint32_t h=hash_djb2_one_32(Variant::DICTIONARY);

	List<Variant> keys;
	get_key_list(&keys);

	for (List<Variant>::Element *E=keys.front();E;E=E->next()) {

		h = hash_djb2_one_32( E->get().hash(), h);
		h = hash_djb2_one_32( operator[](E->get()).hash(), h);

	}


	return h;
}

Array Dictionary::keys() const {

	Array karr;
	karr.resize(size());
	const Variant *K=NULL;
	int idx=0;
	while((K=next(K))) {
		karr[idx++]=(*K);
	}
	return karr;

}

Array Dictionary::values() const {

	Array varr;
	varr.resize(size());
	if (_p->variant_map.empty())
		return varr;

	int count = _p->variant_map.size();
	const HashMap<Variant,DictionaryPrivate::Data,_DictionaryVariantHash>::Pair **pairs = (const HashMap<Variant,DictionaryPrivate::Data,_DictionaryVariantHash>::Pair**)alloca( count * sizeof(HashMap<Variant,DictionaryPrivate::Data,_DictionaryVariantHash>::Pair *) );
	_p->variant_map.get_key_value_ptr_array(pairs);

	SortArray<const HashMap<Variant,DictionaryPrivate::Data,_DictionaryVariantHash>::Pair*,DictionaryPrivateSort>  sort;
	sort.sort(pairs,count);

	for(int i=0;i<count;i++) {
		varr[i]=pairs[i]->data.variant;
	}

	return varr;
}

const Variant* Dictionary::next(const Variant* p_key) const {

	return _p->variant_map.next(p_key);
}

Dictionary Dictionary::copy() const {

	Dictionary n(is_shared());

	List<Variant> keys;
	get_key_list(&keys);

	for(List<Variant>::Element *E=keys.front();E;E=E->next()) {
		n[E->get()]=operator[](E->get());
	}

	return n;
}


void Dictionary::operator=(const Dictionary& p_dictionary) {

	_ref(p_dictionary);
}



Dictionary::Dictionary(const Dictionary& p_from) {
	_p=NULL;
	_ref(p_from);
}


Dictionary::Dictionary(bool p_shared) {

	_p=memnew( DictionaryPrivate );
	_p->refcount.init();
	_p->counter=0;
	_p->shared=p_shared;

}
Dictionary::~Dictionary() {

	_unref();
}