/*

Copyright (c) 2003-2014, Arvid Norberg
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:

    * Redistributions of source code must retain the above copyright
      notice, this list of conditions and the following disclaimer.
    * 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.
    * Neither the name of the author 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 THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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 <algorithm>
#if TORRENT_USE_IOSTREAM
#include <iostream>
#endif
#include <boost/bind.hpp>
#include "libtorrent/entry.hpp"
#include "libtorrent/config.hpp"
#include "libtorrent/escape_string.hpp"
#ifndef TORRENT_NO_DEPRECATE
#include "libtorrent/lazy_entry.hpp"
#endif
#include "libtorrent/bdecode.hpp"
#include "libtorrent/escape_string.hpp"

#if defined(_MSC_VER)
#define for if (false) {} else for
#endif

namespace
{
	template <class T>
	void call_destructor(T* o)
	{
		TORRENT_ASSERT(o);
		o->~T();
	}
}

namespace libtorrent
{
	namespace detail
	{
		TORRENT_EXPORT char const* integer_to_str(char* buf, int size, entry::integer_type val)
		{
			int sign = 0;
			if (val < 0)
			{
				sign = 1;
				val = -val;
			}
			buf[--size] = '\0';
			if (val == 0) buf[--size] = '0';
			for (; size > sign && val != 0;)
			{
				buf[--size] = '0' + char(val % 10);
				val /= 10;
			}
			if (sign) buf[--size] = '-';
			return buf + size;
		}
	}

	entry& entry::operator[](char const* key)
	{
		dictionary_type::iterator i = dict().find(key);
		if (i != dict().end()) return i->second;
		dictionary_type::iterator ret = dict().insert(
			std::pair<const std::string, entry>(key, entry())).first;
		return ret->second;
	}

	entry& entry::operator[](std::string const& key)
	{
		dictionary_type::iterator i = dict().find(key);
		if (i != dict().end()) return i->second;
		dictionary_type::iterator ret = dict().insert(
			std::make_pair(key, entry())).first;
		return ret->second;
	}

	entry* entry::find_key(char const* key)
	{
		dictionary_type::iterator i = dict().find(key);
		if (i == dict().end()) return 0;
		return &i->second;
	}

	entry const* entry::find_key(char const* key) const
	{
		dictionary_type::const_iterator i = dict().find(key);
		if (i == dict().end()) return 0;
		return &i->second;
	}
	
	entry* entry::find_key(std::string const& key)
	{
		dictionary_type::iterator i = dict().find(key);
		if (i == dict().end()) return 0;
		return &i->second;
	}

	entry const* entry::find_key(std::string const& key) const
	{
		dictionary_type::const_iterator i = dict().find(key);
		if (i == dict().end()) return 0;
		return &i->second;
	}
	
#ifndef BOOST_NO_EXCEPTIONS
	const entry& entry::operator[](char const* key) const
	{
		return (*this)[std::string(key)];
	}

	const entry& entry::operator[](std::string const& key) const
	{
		dictionary_type::const_iterator i = dict().find(key);
		if (i == dict().end()) throw type_error(
			(std::string("key not found: ") + key).c_str());
		return i->second;
	}
#endif

	entry::data_type entry::type() const
	{
#ifdef TORRENT_DEBUG
		m_type_queried = true;
#endif
		return (entry::data_type)m_type;
	}

	entry::~entry() { destruct(); }

	void entry::operator=(const entry& e)
	{
		destruct();
		copy(e);
	}

	entry::integer_type& entry::integer()
	{
		if (m_type == undefined_t) construct(int_t);
#ifndef BOOST_NO_EXCEPTIONS
		if (m_type != int_t) throw_type_error();
#elif defined TORRENT_DEBUG
		TORRENT_ASSERT(m_type_queried);
#endif
		TORRENT_ASSERT(m_type == int_t);
		return *reinterpret_cast<integer_type*>(data);
	}

	entry::integer_type const& entry::integer() const
	{
#ifndef BOOST_NO_EXCEPTIONS
		if (m_type != int_t) throw_type_error();
#elif defined TORRENT_DEBUG
		TORRENT_ASSERT(m_type_queried);
#endif
		TORRENT_ASSERT(m_type == int_t);
		return *reinterpret_cast<const integer_type*>(data);
	}

	entry::string_type& entry::string()
	{
		if (m_type == undefined_t) construct(string_t);
#ifndef BOOST_NO_EXCEPTIONS
		if (m_type != string_t) throw_type_error();
#elif defined TORRENT_DEBUG
		TORRENT_ASSERT(m_type_queried);
#endif
		TORRENT_ASSERT(m_type == string_t);
		return *reinterpret_cast<string_type*>(data);
	}

	entry::string_type const& entry::string() const
	{
#ifndef BOOST_NO_EXCEPTIONS
		if (m_type != string_t) throw_type_error();
#elif defined TORRENT_DEBUG
		TORRENT_ASSERT(m_type_queried);
#endif
		TORRENT_ASSERT(m_type == string_t);
		return *reinterpret_cast<const string_type*>(data);
	}

	entry::list_type& entry::list()
	{
		if (m_type == undefined_t) construct(list_t);
#ifndef BOOST_NO_EXCEPTIONS
		if (m_type != list_t) throw_type_error();
#elif defined TORRENT_DEBUG
		TORRENT_ASSERT(m_type_queried);
#endif
		TORRENT_ASSERT(m_type == list_t);
		return *reinterpret_cast<list_type*>(data);
	}

	entry::list_type const& entry::list() const
	{
#ifndef BOOST_NO_EXCEPTIONS
		if (m_type != list_t) throw_type_error();
#elif defined TORRENT_DEBUG
		TORRENT_ASSERT(m_type_queried);
#endif
		TORRENT_ASSERT(m_type == list_t);
		return *reinterpret_cast<const list_type*>(data);
	}

	entry::dictionary_type& entry::dict()
	{
		if (m_type == undefined_t) construct(dictionary_t);
#ifndef BOOST_NO_EXCEPTIONS
		if (m_type != dictionary_t) throw_type_error();
#elif defined TORRENT_DEBUG
		TORRENT_ASSERT(m_type_queried);
#endif
		TORRENT_ASSERT(m_type == dictionary_t);
		return *reinterpret_cast<dictionary_type*>(data);
	}

	entry::dictionary_type const& entry::dict() const
	{
#ifndef BOOST_NO_EXCEPTIONS
		if (m_type != dictionary_t) throw_type_error();
#elif defined TORRENT_DEBUG
		TORRENT_ASSERT(m_type_queried);
#endif
		TORRENT_ASSERT(m_type == dictionary_t);
		return *reinterpret_cast<const dictionary_type*>(data);
	}

	entry::entry()
		: m_type(undefined_t)
	{
#ifdef TORRENT_DEBUG
		m_type_queried = true;
#endif
	}

	entry::entry(data_type t)
		: m_type(undefined_t)
	{
		construct(t);
#ifdef TORRENT_DEBUG
		m_type_queried = true;
#endif
	}

	entry::entry(const entry& e)
		: m_type(undefined_t)
	{
		copy(e);
#ifdef TORRENT_DEBUG
		m_type_queried = e.m_type_queried;
#endif
	}

	entry::entry(dictionary_type const& v)
		: m_type(undefined_t)
	{
#ifdef TORRENT_DEBUG
		m_type_queried = true;
#endif
		new(data) dictionary_type(v);
		m_type = dictionary_t;
	}

	entry::entry(string_type const& v)
		: m_type(undefined_t)
	{
#ifdef TORRENT_DEBUG
		m_type_queried = true;
#endif
		new(data) string_type(v);
		m_type = string_t;
	}

	entry::entry(list_type const& v)
		: m_type(undefined_t)
	{
#ifdef TORRENT_DEBUG
		m_type_queried = true;
#endif
		new(data) list_type(v);
		m_type = list_t;
	}

	entry::entry(integer_type const& v)
		: m_type(undefined_t)
	{
#ifdef TORRENT_DEBUG
		m_type_queried = true;
#endif
		new(data) integer_type(v);
		m_type = int_t;
	}

	// convert a bdecode_node into an old skool entry
	void entry::operator=(bdecode_node const& e)
	{
		switch (e.type())
		{
			case bdecode_node::string_t:
				this->string() = e.string_value();
				break;
			case bdecode_node::int_t:
				this->integer() = e.int_value();
				break;
			case bdecode_node::dict_t:
			{
				dictionary_type& d = this->dict();
				for (int i = 0; i < e.dict_size(); ++i)
				{
					std::pair<std::string, bdecode_node> elem = e.dict_at(i);
					d[elem.first] = elem.second;
				}
				break;
			}
			case bdecode_node::list_t:
			{
				list_type& l = this->list();
				for (int i = 0; i < e.list_size(); ++i)
				{
					l.push_back(entry());
					l.back() = e.list_at(i);
				}
				break;
			}
			case bdecode_node::none_t:
				destruct();
				break;
		}
	}

#ifndef TORRENT_NO_DEPRECATE
	// convert a lazy_entry into an old skool entry
	void entry::operator=(lazy_entry const& e)
	{
		switch (e.type())
		{
			case lazy_entry::string_t:
				this->string() = e.string_value();
				break;
			case lazy_entry::int_t:
				this->integer() = e.int_value();
				break;
			case lazy_entry::dict_t:
			{
				dictionary_type& d = this->dict();
				for (int i = 0; i < e.dict_size(); ++i)
				{
					std::pair<std::string, lazy_entry const*> elem = e.dict_at(i);
					d[elem.first] = *elem.second;
				}
				break;
			}
			case lazy_entry::list_t:
			{
				list_type& l = this->list();
				for (int i = 0; i < e.list_size(); ++i)
				{
					l.push_back(entry());
					l.back() = *e.list_at(i);
				}
				break;
			}
			case lazy_entry::none_t:
				destruct();
				break;
		}
	}
#endif

	void entry::operator=(dictionary_type const& v)
	{
		destruct();
		new(data) dictionary_type(v);
		m_type = dictionary_t;
#ifdef TORRENT_DEBUG
		m_type_queried = true;
#endif
	}

	void entry::operator=(string_type const& v)
	{
		destruct();
		new(data) string_type(v);
		m_type = string_t;
#ifdef TORRENT_DEBUG
		m_type_queried = true;
#endif
	}

	void entry::operator=(list_type const& v)
	{
		destruct();
		new(data) list_type(v);
		m_type = list_t;
#ifdef TORRENT_DEBUG
		m_type_queried = true;
#endif
	}

	void entry::operator=(integer_type const& v)
	{
		destruct();
		new(data) integer_type(v);
		m_type = int_t;
#ifdef TORRENT_DEBUG
		m_type_queried = true;
#endif
	}

	bool entry::operator==(entry const& e) const
	{
		if (m_type != e.m_type) return false;

		switch(m_type)
		{
		case int_t:
			return integer() == e.integer();
		case string_t:
			return string() == e.string();
		case list_t:
			return list() == e.list();
		case dictionary_t:
			return dict() == e.dict();
		default:
			TORRENT_ASSERT(m_type == undefined_t);
			return true;
		}
	}

	void entry::construct(data_type t)
	{
		switch(t)
		{
		case int_t:
			new(data) integer_type;
			break;
		case string_t:
			new(data) string_type;
			break;
		case list_t:
			new(data) list_type;
			break;
		case dictionary_t:
			new (data) dictionary_type;
			break;
		default:
			TORRENT_ASSERT(t == undefined_t);
		}
		m_type = t;
#ifdef TORRENT_DEBUG
		m_type_queried = true;
#endif
	}

	void entry::copy(entry const& e)
	{
		switch (e.type())
		{
		case int_t:
			new(data) integer_type(e.integer());
			break;
		case string_t:
			new(data) string_type(e.string());
			break;
		case list_t:
			new(data) list_type(e.list());
			break;
		case dictionary_t:
			new (data) dictionary_type(e.dict());
			break;
		default:
			TORRENT_ASSERT(e.type() == undefined_t);
		}
		m_type = e.type();
#ifdef TORRENT_DEBUG
		m_type_queried = true;
#endif
	}

	void entry::destruct()
	{
		switch(m_type)
		{
		case int_t:
			call_destructor(reinterpret_cast<integer_type*>(data));
			break;
		case string_t:
			call_destructor(reinterpret_cast<string_type*>(data));
			break;
		case list_t:
			call_destructor(reinterpret_cast<list_type*>(data));
			break;
		case dictionary_t:
			call_destructor(reinterpret_cast<dictionary_type*>(data));
			break;
		default:
			TORRENT_ASSERT(m_type == undefined_t);
			break;
		}
		m_type = undefined_t;
#ifdef TORRENT_DEBUG
		m_type_queried = false;
#endif
	}

	void entry::swap(entry& e)
	{
		bool clear_this = false;
		bool clear_that = false;

		if (m_type == undefined_t && e.m_type == undefined_t)
			return;

		if (m_type == undefined_t)
		{
			construct((data_type)e.m_type);
			clear_that = true;
		}

		if (e.m_type == undefined_t)
		{
			e.construct((data_type)m_type);
			clear_this = true;
		}

		if (m_type == e.m_type)
		{
			switch (m_type)
			{
			case int_t:
				std::swap(*reinterpret_cast<integer_type*>(data)
					, *reinterpret_cast<integer_type*>(e.data));
				break;
			case string_t:
				std::swap(*reinterpret_cast<string_type*>(data)
					, *reinterpret_cast<string_type*>(e.data));
				break;
			case list_t:
				std::swap(*reinterpret_cast<list_type*>(data)
					, *reinterpret_cast<list_type*>(e.data));
				break;
			case dictionary_t:
				std::swap(*reinterpret_cast<dictionary_type*>(data)
					, *reinterpret_cast<dictionary_type*>(e.data));
				break;
			default:
				break;
			}

			if (clear_this)
				destruct();

			if (clear_that)
				e.destruct();
		}
		else
		{
			// currently, only swapping entries of the same type or where one
			// of the entries is uninitialized is supported.
			TORRENT_ASSERT(false && "not implemented");
		}
	}

	std::string entry::to_string() const
	{
		std::string ret;
		to_string_impl(ret, 0);
		return ret;
	}

	void entry::to_string_impl(std::string& out, int indent) const
	{
		TORRENT_ASSERT(indent >= 0);
		for (int i = 0; i < indent; ++i) out += " ";
		switch (m_type)
		{
		case int_t:
			out += libtorrent::to_string(integer()).elems;
		  	out += "\n";
			break;
		case string_t:
			{
				bool binary_string = false;
				for (std::string::const_iterator i = string().begin(); i != string().end(); ++i)
				{
					if (!is_print(static_cast<unsigned char>(*i)))
					{
						binary_string = true;
						break;
					}
				}
				if (binary_string)
				{
					out += to_hex(string());
					out += "\n";
				}
				else
				{
					out += string();
					out += "\n";
				}
			} break;
		case list_t:
			{
				out += "list\n";
				for (list_type::const_iterator i = list().begin(); i != list().end(); ++i)
				{
					i->to_string_impl(out, indent+1);
				}
			} break;
		case dictionary_t:
			{
				out += "dictionary\n";
				for (dictionary_type::const_iterator i = dict().begin(); i != dict().end(); ++i)
				{
					bool binary_string = false;
					for (std::string::const_iterator k = i->first.begin(); k != i->first.end(); ++k)
					{
						if (!is_print(static_cast<unsigned char>(*k)))
						{
							binary_string = true;
							break;
						}
					}
					for (int j = 0; j < indent+1; ++j) out += " ";
					out += "[";
					if (binary_string) out += to_hex(i->first);
					else out += i->first;
					out += "]";

					if (i->second.type() != entry::string_t
						&& i->second.type() != entry::int_t)
						out += "\n";
					else out += " ";
					i->second.to_string_impl(out, indent+2);
				}
			} break;
		default:
			out += "<uninitialized>\n";
		}
	}
}