/*
Plugin of Miranda IM for communicating with users of the AIM protocol.
Copyright (c) 2008-2012 Boris Krasnovskiy
Copyright (C) 2005-2006 Aaron Myles Landwehr

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "stdafx.h"

void CAimProto::broadcast_status(int status)
{
	debugLogA("Broadcast Status: %d", status);
	int old_status = m_iStatus;
	m_iStatus = status;
	if (m_iStatus == ID_STATUS_OFFLINE) {
		shutdown_file_transfers();
		shutdown_chat_conn();

		if (m_hServerConn) {
			aim_sendflap(m_hServerConn, 0x04, 0, nullptr, m_seqno);
			Netlib_Shutdown(m_hServerConn);
		}

		if (m_hMailConn && m_hMailConn != (HANDLE)1) {
			aim_sendflap(m_hMailConn, 0x04, 0, nullptr, m_mail_seqno);
			Netlib_Shutdown(m_hMailConn);
		}
		else if (m_hMailConn == (HANDLE)1)
			m_hMailConn = nullptr;

		if (m_hAvatarConn && m_hAvatarConn != (HANDLE)1) {
			aim_sendflap(m_hAvatarConn, 0x04, 0, nullptr, m_avatar_seqno);
			Netlib_Shutdown(m_hAvatarConn);
		}
		else if (m_hAvatarConn == (HANDLE)1)
			m_hAvatarConn = nullptr;

		if (m_hChatNavConn && m_hChatNavConn != (HANDLE)1) {
			aim_sendflap(m_hChatNavConn, 0x04, 0, nullptr, m_chatnav_seqno);
			Netlib_Shutdown(m_hChatNavConn);
		}
		else if (m_hChatNavConn == (HANDLE)1)
			m_hChatNavConn = nullptr;

		m_idle = false;
		m_instantidle = false;
		m_list_received = false;
		m_state = 0;
		m_iDesiredStatus = ID_STATUS_OFFLINE;
		replaceStr(m_last_status_msg, nullptr);

		m_avatar_id_lg = 0;
		m_avatar_id_sm = 0;
		replaceStr(m_hash_lg, nullptr);
		replaceStr(m_hash_sm, nullptr);

		m_pd_flags = 0;
		m_pd_info_id = 0;
		m_pd_mode = 0;

		m_seqno = 0;
		m_mail_seqno = 0;
		m_avatar_seqno = 0;
		m_chatnav_seqno = 0;
		m_admin_seqno = 0;
	}
	ProtoBroadcastAck(NULL, ACKTYPE_STATUS, ACKRESULT_SUCCESS, (HANDLE)old_status, m_iStatus);
}

void CAimProto::start_connection(void*)
{
	if (m_iStatus <= ID_STATUS_OFFLINE) {
		offline_contacts();
		DBVARIANT dbv;
		if (!getString(AIM_KEY_SN, &dbv))
			db_free(&dbv);
		else {
			ShowPopup(LPGEN("Please, enter a user name in the options dialog."), 0);
			broadcast_status(ID_STATUS_OFFLINE);
			return;
		}
		if (!getString(AIM_KEY_PW, &dbv))
			db_free(&dbv);
		else {
			ShowPopup(LPGEN("Please, enter a password in the options dialog."), 0);
			broadcast_status(ID_STATUS_OFFLINE);
			return;
		}


		bool use_clientlogin = getByte(AIM_KEY_CLIENTLOGIN, 1) != 0; //clientlogin should be enabled by default
		if (!use_clientlogin)
		{
			char* login_url = getStringA(AIM_KEY_HN);
			//if (login_url == NULL) login_url = mir_strdup(use_ssl ? AIM_DEFAULT_SERVER : AIM_DEFAULT_SERVER_NS);


			if (login_url == nullptr) login_url = mir_strdup(AIM_DEFAULT_SERVER);

			m_hServerConn = aim_connect(login_url, get_default_port(), false, login_url); //ssl does not work anymore with old authorization algo

			mir_free(login_url);

			m_pref1_flags = 0x77ffff;
			m_pref1_set_flags = 0x77ffff;
			mir_free(m_pref2_flags); m_pref2_flags = nullptr; m_pref2_len = 0;
			mir_free(m_pref2_set_flags); m_pref2_set_flags = nullptr; m_pref2_set_len = 0;

			if (m_hServerConn)
				aim_connection_authorization();
			else
				broadcast_status(ID_STATUS_OFFLINE);
		}
		else
		{
			aim_connection_clientlogin();

		}
	}
}

bool CAimProto::wait_conn(HNETLIBCONN &hConn, HANDLE &hEvent, unsigned short service)
{
	if (m_iStatus == ID_STATUS_OFFLINE)
		return false;
	{
		mir_cslock lck(connMutex);
		if (hConn == nullptr && m_hServerConn) {
			debugLogA("Starting Connection.");
			hConn = (HNETLIBCONN)1;    //set so no additional service request attempts are made while aim is still processing the request
			aim_new_service_request(m_hServerConn, m_seqno, service);//general service connection!
		}
	}

	if (WaitForSingleObjectEx(hEvent, 10000, TRUE) != WAIT_OBJECT_0)
		return false;

	if (Miranda_IsTerminated() || m_iStatus == ID_STATUS_OFFLINE)
		return false;

	return true;
}


unsigned short CAimProto::get_default_port(void)
{
	//return getWord(AIM_KEY_PN, getByte(AIM_KEY_DSSL, 0) ? AIM_DEFAULT_PORT : AIM_DEFAULT_SSL_PORT);
	return AIM_DEFAULT_PORT;
}

bool CAimProto::is_my_contact(MCONTACT hContact)
{
	const char* szProto = GetContactProto(hContact);
	return szProto != nullptr && mir_strcmp(m_szModuleName, szProto) == 0;
}

MCONTACT CAimProto::find_chat_contact(const char* room)
{
	for (MCONTACT hContact = db_find_first(m_szModuleName); hContact; hContact = db_find_next(hContact, m_szModuleName)) {
		DBVARIANT dbv;
		if (!getString(hContact, "ChatRoomID", &dbv)) {
			bool found = !mir_strcmp(room, dbv.pszVal);
			db_free(&dbv);
			if (found)
				return hContact;
		}
	}
	return NULL;
}

MCONTACT CAimProto::contact_from_sn(const char* sn, bool addIfNeeded, bool temporary)
{
	ptrA norm_sn(normalize_name(sn));

	for (MCONTACT hContact = db_find_first(m_szModuleName); hContact; hContact = db_find_next(hContact, m_szModuleName)) {
		DBVARIANT dbv;
		if (!getString(hContact, AIM_KEY_SN, &dbv)) {
			bool found = !mir_strcmp(norm_sn, dbv.pszVal);
			db_free(&dbv);
			if (found)
				return hContact;
		}
	}

	if (addIfNeeded) {
		MCONTACT hContact = db_add_contact();
		if (hContact) {
			if (Proto_AddToContact(hContact, m_szModuleName) == 0) {
				setString(hContact, AIM_KEY_SN, norm_sn);
				setString(hContact, AIM_KEY_NK, sn);
				debugLogA("Adding contact %s to client side list.", norm_sn);
				if (temporary)
					db_set_b(hContact, "CList", "NotOnList", 1);
				return hContact;
			}
			db_delete_contact(hContact);
		}
	}

	return NULL;
}

void CAimProto::update_server_group(const char* group, unsigned short group_id)
{
	unsigned short user_id_array_size;
	unsigned short* user_id_array;

	if (group_id)
		user_id_array = get_members_of_group(group_id, user_id_array_size);
	else {
		user_id_array_size = (unsigned short)m_group_list.getCount();
		user_id_array = (unsigned short*)mir_alloc(user_id_array_size * sizeof(unsigned short));
		for (unsigned short i = 0; i < user_id_array_size; ++i)
			user_id_array[i] = _htons(m_group_list[i].item_id);
	}

	debugLogA("Modifying group %s:%u on the serverside list", group, group_id);
	aim_mod_group(m_hServerConn, m_seqno, group, group_id, (char*)user_id_array,
		user_id_array_size * sizeof(unsigned short));

	mir_free(user_id_array);
}

void CAimProto::add_contact_to_group(MCONTACT hContact, const char* new_group)
{
	if (new_group == nullptr)
		return;

	unsigned short old_group_id = getGroupId(hContact, 1);
	char *old_group = m_group_list.find_name(old_group_id);
	if (old_group && mir_strcmp(new_group, old_group) == 0)
		return;

	DBVARIANT dbv;
	char *nick = nullptr;
	if (!db_get_utf(hContact, MOD_KEY_CL, "MyHandle", &dbv)) {
		nick = NEWSTR_ALLOCA(dbv.pszVal);
		db_free(&dbv);
	}

	if (getString(hContact, AIM_KEY_SN, &dbv)) return;

	unsigned short item_id = getBuddyId(hContact, 1);
	unsigned short new_item_id = search_for_free_item_id(hContact);
	unsigned short new_group_id = m_group_list.find_id(new_group);

	if (!item_id)
		debugLogA("Contact %u not on list.", hContact);

	setGroupId(hContact, 1, new_group_id);
	if (new_group && mir_strcmp(new_group, AIM_DEFAULT_GROUP))
		db_set_utf(hContact, MOD_KEY_CL, OTH_KEY_GP, new_group);
	else
		db_unset(hContact, MOD_KEY_CL, OTH_KEY_GP);

	aim_ssi_update(m_hServerConn, m_seqno, true);

	if (new_group_id == 0) {
		create_group(new_group);
		debugLogA("Group %s not on list.", new_group);
		new_group_id = m_group_list.add(new_group);
		debugLogA("Adding group %s:%u to the serverside list", new_group, new_group_id);
		aim_add_contact(m_hServerConn, m_seqno, new_group, 0, new_group_id, 1);//add the group server-side even if it exist
	}

	debugLogA("Adding buddy %s:%u %s:%u to the serverside list", dbv.pszVal, new_item_id, new_group, new_group_id);
	aim_add_contact(m_hServerConn, m_seqno, dbv.pszVal, new_item_id, new_group_id, 0, nick);

	update_server_group(new_group, new_group_id);

	if (old_group_id && item_id) {
		bool is_not_in_list = getBool(hContact, AIM_KEY_NIL, false);
		debugLogA("Removing buddy %s:%u %s:%u from the serverside list", dbv.pszVal, item_id, old_group, old_group_id);
		aim_delete_contact(m_hServerConn, m_seqno, dbv.pszVal, item_id, old_group_id, 0, is_not_in_list);
		update_server_group(old_group, old_group_id);
		delSetting(hContact, AIM_KEY_NIL);
	}

	aim_ssi_update(m_hServerConn, m_seqno, false);

	db_free(&dbv);
}

void CAimProto::offline_contact(MCONTACT hContact, bool remove_settings)
{
	if (remove_settings) {
		//We need some of this stuff if we are still online.
		for (int i = 1;; ++i) {
			if (deleteBuddyId(hContact, i)) break;
			deleteGroupId(hContact, i);
		}

		db_unset(hContact, MOD_KEY_CL, OTH_KEY_SM);
	}
	setWord(hContact, AIM_KEY_ST, ID_STATUS_OFFLINE);
}

void CAimProto::offline_contacts(void)
{
	for (MCONTACT hContact = db_find_first(m_szModuleName); hContact; hContact = db_find_next(hContact, m_szModuleName))
		offline_contact(hContact, true);

	m_allow_list.destroy();
	m_block_list.destroy();
	m_group_list.destroy();
}

char *normalize_name(const char *s)
{
	if (s == nullptr) return nullptr;

	char* buf = mir_strdup(s);
	_strlwr(buf);
	/*
		char *p = strchr(buf, ' ');
		if (p)
		{
			char *q = p;
			while (*p)
			{
				if (*p != ' ') *(q++) = *p;
				++p;
			}
			*q = '\0';
		}
	*/
	return buf;
}

char* trim_str(char* s)
{
	if (s == nullptr) return nullptr;
	size_t len = mir_strlen(s);

	while (len) {
		if (isspace(s[len - 1])) --len;
		else break;
	}
	s[len] = 0;

	char* sc = s;
	while (isspace(*sc)) ++sc;
	memcpy(s, sc, mir_strlen(sc) + 1);

	return s;
}

void create_group(const char *group)
{
	if (mir_strcmp(group, AIM_DEFAULT_GROUP) == 0) return;

	wchar_t* szGroupName = mir_utf8decodeW(group);
	Clist_GroupCreate(0, szGroupName);
	mir_free(szGroupName);
}

unsigned short CAimProto::search_for_free_item_id(MCONTACT hbuddy)//returns a free item id and links the id to the buddy
{
	unsigned short id;

retry:
	id = get_random();

	for (MCONTACT hContact = db_find_first(m_szModuleName); hContact; hContact = db_find_next(hContact, m_szModuleName)) {
		for (int i = 1; ; ++i) {
			unsigned short item_id = getBuddyId(hContact, i);
			if (item_id == 0) break;

			if (item_id == id) goto retry;    //found one no need to look through anymore
		}
	}

	setBuddyId(hbuddy, 1, id);
	return id;
}

//returns the size of the list array aquired with data
unsigned short* CAimProto::get_members_of_group(unsigned short group_id, unsigned short &size)
{
	unsigned short* list = nullptr;
	size = 0;

	for (MCONTACT hContact = db_find_first(m_szModuleName); hContact; hContact = db_find_next(hContact, m_szModuleName)) {
		for (int i = 1; ; ++i) {
			unsigned short user_group_id = getGroupId(hContact, i);
			if (user_group_id == 0)
				break;

			if (group_id == user_group_id) {
				unsigned short buddy_id = getBuddyId(hContact, i);
				if (buddy_id) {
					list = (unsigned short*)mir_realloc(list, ++size*sizeof(list[0]));
					list[size - 1] = _htons(buddy_id);
				}
			}
		}
	}
	return list;
}

void CAimProto::upload_nicks(void)
{
	for (MCONTACT hContact = db_find_first(m_szModuleName); hContact; hContact = db_find_next(hContact, m_szModuleName)) {
		DBVARIANT dbv;
		if (!db_get_utf(hContact, MOD_KEY_CL, "MyHandle", &dbv)) {
			set_local_nick(hContact, dbv.pszVal, nullptr);
			db_free(&dbv);
		}
	}
}

void CAimProto::set_local_nick(MCONTACT hContact, char* nick, char* note)
{
	DBVARIANT dbv;
	if (getString(hContact, AIM_KEY_SN, &dbv)) return;

	for (int i = 1; ; ++i) {
		unsigned short group_id = getGroupId(hContact, i);
		if (group_id == 0) break;

		unsigned short buddy_id = getBuddyId(hContact, i);
		if (buddy_id == 0) break;

		aim_mod_buddy(m_hServerConn, m_seqno, dbv.pszVal, buddy_id, group_id, nick, note);
	}
	db_free(&dbv);
}

/////////////////////////////////////////////////////////////////////////////////////////

unsigned short BdList::get_free_id(void)
{
	unsigned short id;

retry:
	id = get_random();

	for (int i = 0; i < count; ++i)
		if (items[i]->item_id == id) goto retry;

	return id;
}

unsigned short BdList::find_id(const char* name)
{
	for (int i = 0; i < count; ++i) {
		if (_stricmp(items[i]->name, name) == 0)
			return items[i]->item_id;
	}
	return 0;
}

char* BdList::find_name(unsigned short id)
{
	for (int i = 0; i < count; ++i) {
		if (items[i]->item_id == id)
			return items[i]->name;
	}
	return nullptr;
}

void BdList::remove_by_id(unsigned short id)
{
	for (int i = 0; i < count; ++i) {
		if (items[i]->item_id == id) {
			remove(i);
			break;
		}
	}
}

/////////////////////////////////////////////////////////////////////////////////////////

unsigned short CAimProto::getBuddyId(MCONTACT hContact, int i)
{
	char item[sizeof(AIM_KEY_BI) + 10];
	mir_snprintf(item, AIM_KEY_BI"%d", i);
	return getWord(hContact, item, 0);
}

void CAimProto::setBuddyId(MCONTACT hContact, int i, unsigned short id)
{
	char item[sizeof(AIM_KEY_BI) + 10];
	mir_snprintf(item, AIM_KEY_BI"%d", i);
	setWord(hContact, item, id);
}

int CAimProto::deleteBuddyId(MCONTACT hContact, int i)
{
	char item[sizeof(AIM_KEY_BI) + 10];
	mir_snprintf(item, AIM_KEY_BI"%d", i);
	return delSetting(hContact, item);
}

unsigned short CAimProto::getGroupId(MCONTACT hContact, int i)
{
	char item[sizeof(AIM_KEY_GI) + 10];
	mir_snprintf(item, AIM_KEY_GI"%d", i);
	return getWord(hContact, item, 0);
}

void CAimProto::setGroupId(MCONTACT hContact, int i, unsigned short id)
{
	char item[sizeof(AIM_KEY_GI) + 10];
	mir_snprintf(item, AIM_KEY_GI"%d", i);
	setWord(hContact, item, id);
}

int CAimProto::deleteGroupId(MCONTACT hContact, int i)
{
	char item[sizeof(AIM_KEY_GI) + 10];
	mir_snprintf(item, AIM_KEY_GI"%d", i);
	return delSetting(hContact, item);
}

/////////////////////////////////////////////////////////////////////////////////////////

int CAimProto::open_contact_file(const char*, const wchar_t* file, const char*, wchar_t* &path, bool contact_dir)
{
	path = (wchar_t*)mir_alloc(MAX_PATH * sizeof(wchar_t));

	int pos = mir_snwprintf(path, MAX_PATH, L"%s\\%S", VARSW(L"%miranda_userdata%"), m_szModuleName);
	if (contact_dir)
		pos += mir_snwprintf(path + pos, MAX_PATH - pos, L"\\%S", m_szModuleName);

	if (_waccess(path, 0))
		CreateDirectoryTreeW(path);

	mir_snwprintf(path + pos, MAX_PATH - pos, L"\\%s", file);
	int fid = _wopen(path, _O_CREAT | _O_RDWR | _O_BINARY, _S_IREAD);
	if (fid < 0) {
		wchar_t errmsg[512];
		mir_snwprintf(errmsg, TranslateT("Failed to open file: %s %s"), path, __tcserror(nullptr));
		ShowPopup((char*)errmsg, ERROR_POPUP | TCHAR_POPUP);
	}
	return fid;
}

void CAimProto::write_away_message(const char* sn, const char* msg, bool utf)
{
	wchar_t* path;
	int fid = open_contact_file(sn, L"away.html", "wb", path, 1);
	if (fid >= 0) {
		if (utf) _write(fid, "\xEF\xBB\xBF", 3);
		char* s_msg = process_status_msg(msg, sn);
		_write(fid, "<h3>", 4);
		_write(fid, sn, (unsigned)mir_strlen(sn));
		_write(fid, "'s Away Message:</h3>", 21);
		_write(fid, s_msg, (unsigned)mir_strlen(s_msg));
		_close(fid);
		ShellExecute(nullptr, L"open", path, nullptr, nullptr, SW_SHOW);
		mir_free(path);
		mir_free(s_msg);
	}
}

void CAimProto::write_profile(const char* sn, const char* msg, bool utf)
{
	wchar_t* path;
	int fid = open_contact_file(sn, L"profile.html", "wb", path, 1);
	if (fid >= 0) {
		if (utf) _write(fid, "\xEF\xBB\xBF", 3);
		char* s_msg = process_status_msg(msg, sn);
		_write(fid, "<h3>", 4);
		_write(fid, sn, (unsigned)mir_strlen(sn));
		_write(fid, "'s Profile:</h3>", 16);
		_write(fid, s_msg, (unsigned)mir_strlen(s_msg));
		_close(fid);
		ShellExecute(nullptr, L"open", path, nullptr, nullptr, SW_SHOW);
		mir_free(path);
		mir_free(s_msg);
	}
}

unsigned long aim_oft_checksum_chunk(unsigned long dwChecksum, const unsigned char *buffer, int len)
{
	unsigned long checksum = (dwChecksum >> 16) & 0xffff;

	for (int i = 0; i < len; i++) {
		unsigned val = buffer[i];

		if ((i & 1) == 0)
			val <<= 8;

		if (checksum < val) ++val;
		checksum -= val;
	}
	checksum = ((checksum & 0x0000ffff) + (checksum >> 16));
	checksum = ((checksum & 0x0000ffff) + (checksum >> 16));
	return checksum << 16;
}

unsigned int aim_oft_checksum_file(wchar_t *filename, unsigned __int64 size)
{
	unsigned long checksum = 0xffff0000;
	int fid = _wopen(filename, _O_RDONLY | _O_BINARY, _S_IREAD);
	if (fid >= 0) {
		unsigned __int64 sz = _filelengthi64(fid);
		if (size > sz) size = sz;
		while (size) {
			unsigned char buffer[8912];
			int bytes = (int)min(size, sizeof(buffer));
			bytes = _read(fid, buffer, bytes);
			size -= bytes;
			checksum = aim_oft_checksum_chunk(checksum, buffer, bytes);
		}
		_close(fid);
	}
	return checksum;
}

char* long_ip_to_char_ip(unsigned long host, char* ip)
{
	host = _htonl(host);
	unsigned char* bytes = (unsigned char*)&host;
	size_t buf_loc = 0;
	for (int i = 0; i < 4; i++) {
		char store[16];
		_itoa(bytes[i], store, 10);
		size_t len = mir_strlen(store);

		memcpy(&ip[buf_loc], store, len);
		buf_loc += len;
		ip[buf_loc++] = '.';
	}
	ip[buf_loc - 1] = '\0';

	return ip;
}

unsigned long char_ip_to_long_ip(char* ip)
{
	unsigned char chost[4] = { 0 };
	char *c = ip;
	for (int i = 0; i < 4; ++i) {
		chost[i] = (unsigned char)atoi(c);
		c = strchr(c, '.');
		if (c) ++c;
		else break;
	}
	return *(unsigned long*)&chost;
}

unsigned short get_random(void)
{
	unsigned short id;
	Utils_GetRandom(&id, sizeof(id));
	id &= 0x7fff;
	return id;
}