/*

Facebook plugin for Miranda Instant Messenger
_____________________________________________

Copyright © 2009-11 Michal Zelinka, 2011-16 Robert Pösel

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 updateStringUtf(FacebookProto *proto, MCONTACT hContact, const char *key, const std::string &value) {
	bool update_required = true;

	DBVARIANT dbv;
	if (!proto->getStringUtf(hContact, key, &dbv)) {
		update_required = mir_strcmp(dbv.pszVal, value.c_str()) != 0;
		db_free(&dbv);
	}

	if (update_required) {
		proto->setStringUtf(hContact, key, value.c_str());
	}
}

void FacebookProto::SaveName(MCONTACT hContact, const facebook_user *fbu)
{
	// Save nick
	std::string nick = fbu->real_name;
	if (!getBool(FACEBOOK_KEY_NAME_AS_NICK, 1) && !fbu->nick.empty())
		nick = fbu->nick;

	updateStringUtf(this, hContact, FACEBOOK_KEY_NICK, nick);

	// Explode whole name into first, second and last name
	std::vector<std::string> names;
	utils::text::explode(fbu->real_name, " ", &names);

	updateStringUtf(this, hContact, FACEBOOK_KEY_FIRST_NAME, names.size() > 0 ? names.front().c_str() : "");
	updateStringUtf(this, hContact, FACEBOOK_KEY_LAST_NAME, names.size() > 1 ? names.back().c_str() : "");

	std::string middle;
	if (names.size() > 2) {
		for (std::string::size_type i = 1; i < names.size() - 1; i++) {
			if (!middle.empty())
				middle += " ";

			middle += names.at(i);
		}
	}
	updateStringUtf(this, hContact, FACEBOOK_KEY_SECOND_NAME, middle);
}

bool FacebookProto::IsMyContact(MCONTACT hContact, bool include_chat)
{
	const char *proto = GetContactProto(hContact);
	if (proto && !mir_strcmp(m_szModuleName, proto)) {
		if (include_chat)
			return true;
		return !isChatRoom(hContact);
	}
	return false;
}

MCONTACT FacebookProto::ChatIDToHContact(const std::string &chat_id)
{
	if (chat_id.empty()) {
		debugLogA("!!! Calling ChatIDToContactID() with empty chat_id");
		return 0;
	}

	// First check cache
	auto it = facy.chat_id_to_hcontact.find(chat_id);
	if (it != facy.chat_id_to_hcontact.end()) {
		// Check if contact is still valid
		if (CallService(MS_DB_CONTACT_IS, (WPARAM)it->second) == 1)
			return it->second;
		else
			facy.chat_id_to_hcontact.erase(it);
	}

	// Go through all local contacts
	for (MCONTACT hContact = db_find_first(m_szModuleName); hContact; hContact = db_find_next(hContact, m_szModuleName)) {
		if (!IsMyContact(hContact, true))
			continue;

		ptrA id(getStringA(hContact, "ChatRoomID"));
		if (id && !mir_strcmp(id, chat_id.c_str())) {
			facy.chat_id_to_hcontact.insert(std::make_pair(chat_id, hContact));
			return hContact;
		}
	}

	return 0;
}

MCONTACT FacebookProto::ContactIDToHContact(const std::string &user_id)
{
	if (user_id.empty()) {
		debugLogA("!!! Calling ContactIDToHContact() with empty user_id");
		return 0;
	}

	// First check cache
	std::map<std::string, MCONTACT>::iterator it = facy.user_id_to_hcontact.find(user_id);
	if (it != facy.user_id_to_hcontact.end()) {
		// Check if contact is still valid
		if (CallService(MS_DB_CONTACT_IS, (WPARAM)it->second) == 1)
			return it->second;
		else
			facy.user_id_to_hcontact.erase(it);
	}

	// Go through all local contacts
	for (MCONTACT hContact = db_find_first(m_szModuleName); hContact; hContact = db_find_next(hContact, m_szModuleName)) {
		if (isChatRoom(hContact))
			continue;

		ptrA id(getStringA(hContact, FACEBOOK_KEY_ID));
		if (id && !mir_strcmp(id, user_id.c_str())) {
			facy.user_id_to_hcontact.insert(std::make_pair(user_id, hContact));
			return hContact;
		}
	}

	return 0;
}

std::string FacebookProto::ThreadIDToContactID(const std::string &thread_id)
{
	if (thread_id.empty()) {
		debugLogA("!!! Calling ThreadIDToContactID() with empty thread_id");
		return "";
	}

	// First check cache
	std::map<std::string, std::string>::iterator it = facy.thread_id_to_user_id.find(thread_id);
	if (it != facy.thread_id_to_user_id.end()) {
		return it->second;
	}

	// Go through all local contacts
	for (MCONTACT hContact = db_find_first(m_szModuleName); hContact; hContact = db_find_next(hContact, m_szModuleName)) {
		if (!IsMyContact(hContact))
			continue;

		ptrA tid(getStringA(hContact, FACEBOOK_KEY_TID));
		if (tid && !mir_strcmp(tid, thread_id.c_str())) {
			ptrA id(getStringA(hContact, FACEBOOK_KEY_ID));
			std::string user_id = (id ? id : "");
			if (!user_id.empty()) {
				facy.thread_id_to_user_id.insert(std::make_pair(thread_id, user_id));
				return user_id;
			}
			break; // this shouldn't happen unless user manually deletes ID from FB contact in DB
		}
	}

	// We don't have any contact with this thread_id cached, we must ask server	
	if (isOffline())
		return "";

	std::string data = "client=mercury";
	data += "&__user=" + facy.self_.user_id;
	data += "&__dyn=" + facy.__dyn();
	data += "&__req=" + facy.__req();
	data += "&fb_dtsg=" + facy.dtsg_;
	data += "&ttstamp=" + facy.ttstamp_;
	data += "&__rev=" + facy.__rev();

	data += "&threads[thread_ids][0]=" + utils::url::encode(thread_id);

	std::string user_id;
	http::response resp = facy.flap(REQUEST_THREAD_INFO, &data); // NOTE: Request revised 1.9.2015

	if (resp.code == HTTP_CODE_OK) {
		CODE_BLOCK_TRY

			facebook_json_parser* p = new facebook_json_parser(this);
		p->parse_thread_info(&resp.data, &user_id);
		delete p;

		if (!user_id.empty())
			facy.thread_id_to_user_id.insert(std::make_pair(thread_id, user_id));

		debugLogA("*** Thread info processed");

		CODE_BLOCK_CATCH

			debugLogA("*** Error processing thread info: %s", e.what());

		CODE_BLOCK_END
	}

	return user_id;
}

void FacebookProto::LoadContactInfo(facebook_user* fbu)
{
	if (isOffline())
		return;

	// TODO: support for more friends at once
	std::string data = "ids[0]=" + utils::url::encode(fbu->user_id);

	data += "&__user=" + facy.self_.user_id;
	data += "&__dyn=" + facy.__dyn();
	data += "&__req=" + facy.__req();
	data += "&fb_dtsg=" + facy.dtsg_;
	data += "&ttstamp=" + facy.ttstamp_;
	data += "&__rev=" + facy.__rev();

	http::response resp = facy.flap(REQUEST_USER_INFO, &data); // NOTE: Request revised 11.2.2016

	if (resp.code == HTTP_CODE_OK) {
		CODE_BLOCK_TRY

			facebook_json_parser* p = new facebook_json_parser(this);
			p->parse_user_info(&resp.data, fbu);
			delete p;

			debugLogA("*** Contact thread info processed");

		CODE_BLOCK_CATCH

			debugLogA("*** Error processing contact thread info: %s", e.what());

		CODE_BLOCK_END
	}
}

void FacebookProto::LoadParticipantsNames(facebook_chatroom *fbc)
{
	for (std::map<std::string, std::string>::iterator it = fbc->participants.begin(); it != fbc->participants.end(); ++it) {
		if (it->second.empty()) {
			if (!mir_strcmp(it->first.c_str(), facy.self_.user_id.c_str()))
				it->second = facy.self_.real_name;
			else {
				MCONTACT hContact = ContactIDToHContact(it->first.c_str());
				if (hContact != NULL) {
					DBVARIANT dbv;
					if (!getStringUtf(hContact, FACEBOOK_KEY_NICK, &dbv)) {
						it->second = dbv.pszVal;
						db_free(&dbv);
					}
					// TODO: set correct role (friend/user) for this contact here - need rework participants map to <id, participant>
				}

				// TODO: load unknown contact's names from server
				if (it->second.empty())
					it->second = it->first;

				//if (isOffline())
				//	return;
			}
		}
	}
}

void FacebookProto::LoadChatInfo(facebook_chatroom *fbc)
{
	if (isOffline())
		return;

	std::string data = "client=mercury";
	data += "&__user=" + facy.self_.user_id;
	data += "&__dyn=" + facy.__dyn();
	data += "&__req=" + facy.__req();
	data += "&fb_dtsg=" + facy.dtsg_;
	data += "&ttstamp=" + facy.ttstamp_;
	data += "&__rev=" + facy.__rev();

	std::string thread_id = utils::url::encode(fbc->thread_id);

	// request info about thread
	data += "&threads[thread_ids][0]=" + thread_id;

	// TODO: ABILITY TO DEFINE TIMESTAMP! (way to load history since specific moment? ... offset seems to does nothing at all)
	/* messages[user_ids][<<userid>>][offset]=11
	messages[user_ids][<<userid>>][timestamp]=1446369866009 // most recent message has this timestamp (included)
	messages[user_ids][<<userid>>][limit]=20 */

	http::response resp = facy.flap(REQUEST_THREAD_INFO, &data); // NOTE: Request revised 12.2.2016

	if (resp.code != HTTP_CODE_OK) {
		facy.handle_error("LoadChatInfo");
		return;
	}

	CODE_BLOCK_TRY

		facebook_json_parser* p = new facebook_json_parser(this);
		p->parse_chat_info(&resp.data, fbc);
		delete p;

		// Load missing participants names
		LoadParticipantsNames(fbc);

		// If chat has no name, create name from participants list
		if (fbc->chat_name.empty()) {
			unsigned int namesUsed = 0;

			for (std::map<std::string, std::string>::iterator it = fbc->participants.begin(); it != fbc->participants.end(); ++it) {
				std::string participant = it->second;

				// Ignore empty and numeric only participant names
				if (participant.empty() || participant.find_first_not_of("0123456789") == std::string::npos)
					continue;

				if (namesUsed > 0)
					fbc->chat_name += _T(", ");

				std::tstring tname = _A2T(participant.c_str(), CP_UTF8);
				fbc->chat_name += utils::text::prepare_name(tname, false);
				
				if (++namesUsed >= FACEBOOK_CHATROOM_NAMES_COUNT)
					break;
			}

			if (fbc->participants.size() > namesUsed) {
				TCHAR more[200];
				mir_sntprintf(more, TranslateT("%s and more (%d)"), fbc->chat_name.c_str(), fbc->participants.size() - namesUsed);
				fbc->chat_name = more;
			}

			// If there are no participants to create a name from, use just thread_id
			if (fbc->chat_name.empty())
				fbc->chat_name = std::tstring(_A2T(fbc->thread_id.c_str())); // TODO: is this needed? Isn't it showed automatically as id if there is no name?
		}

		//ReceiveMessages(messages, true); // don't let it fall into infinite cycle, solve it somehow...

		debugLogA("*** Chat thread info processed");

	CODE_BLOCK_CATCH

		debugLogA("*** Error processing chat thread info: %s", e.what());

	CODE_BLOCK_END

	facy.handle_success("LoadChatInfo");
}

MCONTACT FacebookProto::AddToContactList(facebook_user* fbu, ContactType type, bool force_add, bool add_temporarily)
{
	// Ignore self user completely
	if (fbu->user_id == facy.self_.user_id)
		return NULL;

	// First, check if this contact exists (and if does, just return it)
	if (!force_add) {
		MCONTACT hContact = ContactIDToHContact(fbu->user_id);

		if (hContact)
			return hContact;
	}

	// Try to make a new contact
	MCONTACT hContact = (MCONTACT)CallService(MS_DB_CONTACT_ADD);

	if (hContact && Proto_AddToContact(hContact, m_szModuleName) != 0) {
		CallService(MS_DB_CONTACT_DELETE, hContact);
		hContact = NULL;
	}

	// If we have some contact, we'll save its data
	if (hContact) {
		// Save these values only when adding new contact, not when updating existing
		if (add_temporarily) {
			db_set_b(hContact, "CList", "Hidden", 1);
			db_set_b(hContact, "CList", "NotOnList", 1);
		}

		setString(hContact, FACEBOOK_KEY_ID, fbu->user_id.c_str());

		std::string homepage = FACEBOOK_URL_PROFILE + fbu->user_id;
		setString(hContact, "Homepage", homepage.c_str());
		setTString(hContact, "MirVer", fbu->getMirVer());

		db_unset(hContact, "CList", "MyHandle");

		if (m_tszDefaultGroup)
			db_set_ts(hContact, "CList", "Group", m_tszDefaultGroup);

		setByte(hContact, FACEBOOK_KEY_CONTACT_TYPE, type);

		if (getByte(FACEBOOK_KEY_DISABLE_STATUS_NOTIFY, 0))
			CallService(MS_IGNORE_IGNORE, hContact, (LPARAM)IGNOREEVENT_USERONLINE);

		if (!fbu->real_name.empty())
			SaveName(hContact, fbu);

		if (!fbu->username.empty())
			setString(hContact, FACEBOOK_KEY_USERNAME, fbu->username.c_str());

		if (fbu->gender)
			setByte(hContact, "Gender", fbu->gender);

		// CheckAvatarChange(hContact, fbu->image_url);
	}

	return hContact;
}

void FacebookProto::SetAllContactStatuses(int status)
{
	for (MCONTACT hContact = db_find_first(m_szModuleName); hContact; hContact = db_find_next(hContact, m_szModuleName)) {
		if (isChatRoom(hContact))
			continue;

		if (getWord(hContact, "Status", 0) != status)
			setWord(hContact, "Status", status);
	}
}

void FacebookProto::DeleteContactFromServer(void *data)
{
	facy.handle_entry("DeleteContactFromServer");

	if (data == NULL)
		return;

	std::string id = *(std::string*)data;
	delete (std::string*)data;

	if (isOffline())
		return;

	std::string query = "norefresh=true&unref=button_dropdown&confirmed=1&__a=1";
	query += "&fb_dtsg=" + facy.dtsg_;
	query += "&uid=" + id;
	query += "&__user=" + facy.self_.user_id;
	query += "&ttstamp=" + facy.ttstamp_;

	std::string get_query = "norefresh=true&unref=button_dropdown&uid=" + id;

	// Get unread inbox threads
	http::response resp = facy.flap(REQUEST_DELETE_FRIEND, &query, &get_query);

	if (resp.data.find("\"payload\":null", 0) != std::string::npos)
	{
		facebook_user* fbu = facy.buddies.find(id);
		if (fbu != NULL)
			fbu->deleted = true;

		MCONTACT hContact = ContactIDToHContact(id);

		// If contact wasn't deleted from database
		if (hContact != NULL) {
			setWord(hContact, "Status", ID_STATUS_OFFLINE);
			setByte(hContact, FACEBOOK_KEY_CONTACT_TYPE, CONTACT_NONE);
			setDword(hContact, FACEBOOK_KEY_DELETED, ::time(NULL));
		}

		NotifyEvent(m_tszUserName, TranslateT("Contact was removed from your server list."), NULL, FACEBOOK_EVENT_FRIENDSHIP);
	}
	else {
		facy.client_notify(TranslateT("Error occurred when removing contact from server."));
	}

	if (resp.code != HTTP_CODE_OK)
		facy.handle_error("DeleteContactFromServer");
}

void FacebookProto::AddContactToServer(void *data)
{
	facy.handle_entry("AddContactToServer");

	if (data == NULL)
		return;

	std::string id = *(std::string*)data;
	delete (std::string*)data;

	if (isOffline())
		return;

	std::string query = "action=add_friend&how_found=profile_button&ref_param=ts&outgoing_id=&unwanted=&logging_location=&no_flyout_on_click=false&ego_log_data=&lsd=";
	query += "&fb_dtsg=" + facy.dtsg_;
	query += "&to_friend=" + id;
	query += "&__user=" + facy.self_.user_id;

	// Get unread inbox threads
	http::response resp = facy.flap(REQUEST_ADD_FRIEND, &query);

	if (resp.data.find("\"success\":true", 0) != std::string::npos) {
		MCONTACT hContact = ContactIDToHContact(id);

		// If contact wasn't deleted from database
		if (hContact != NULL)
			setByte(hContact, FACEBOOK_KEY_CONTACT_TYPE, CONTACT_REQUEST);

		NotifyEvent(m_tszUserName, TranslateT("Request for friendship was sent."), NULL, FACEBOOK_EVENT_FRIENDSHIP);
	}
	else facy.client_notify(TranslateT("Error occurred when requesting friendship."));

	if (resp.code != HTTP_CODE_OK)
		facy.handle_error("AddContactToServer");
}

void FacebookProto::ApproveContactToServer(void *data)
{
	facy.handle_entry("ApproveContactToServer");

	if (data == NULL)
		return;

	MCONTACT hContact = *(MCONTACT*)data;
	delete (MCONTACT*)data;

	if (isOffline())
		return;

	ptrA id(getStringA(hContact, FACEBOOK_KEY_ID));
	if (!id)
		return;

	std::string query = "action=confirm";
	query += "&id=" + std::string(id);
	query += "&__user=" + facy.self_.user_id;
	query += "&fb_dtsg=" + facy.dtsg_;

	// Ignore friendship request
	http::response resp = facy.flap(REQUEST_FRIENDSHIP, &query);

	if (resp.data.find("\"success\":true") != std::string::npos)
	{
		setByte(hContact, FACEBOOK_KEY_CONTACT_TYPE, CONTACT_FRIEND);
		NotifyEvent(m_tszUserName, TranslateT("Request for friendship was accepted."), NULL, FACEBOOK_EVENT_FRIENDSHIP);
	}
	else facy.client_notify(TranslateT("Error occurred when accepting friendship request."));

	if (resp.code != HTTP_CODE_OK)
		facy.handle_error("ApproveContactToServer");
}

void FacebookProto::CancelFriendsRequest(void *data)
{
	facy.handle_entry("CancelFriendsRequest");

	if (data == NULL)
		return;

	MCONTACT hContact = *(MCONTACT*)data;
	delete (MCONTACT*)data;

	if (isOffline())
		return;

	ptrA id(getStringA(hContact, FACEBOOK_KEY_ID));
	if (!id)
		return;

	std::string query = "confirmed=1";
	query += "&fb_dtsg=" + facy.dtsg_;
	query += "&__user=" + facy.self_.user_id;
	query += "&friend=" + std::string(id);

	// Cancel (our) friendship request
	http::response resp = facy.flap(REQUEST_CANCEL_FRIENDSHIP, &query);

	if (resp.data.find("\"payload\":null", 0) != std::string::npos)
	{
		setByte(hContact, FACEBOOK_KEY_CONTACT_TYPE, CONTACT_NONE);
		NotifyEvent(m_tszUserName, TranslateT("Request for friendship was canceled."), NULL, FACEBOOK_EVENT_FRIENDSHIP);
	}
	else facy.client_notify(TranslateT("Error occurred when canceling friendship request."));

	if (resp.code != HTTP_CODE_OK)
		facy.handle_error("CancelFriendsRequest");
}

void FacebookProto::IgnoreFriendshipRequest(void *data)
{
	facy.handle_entry("IgnoreFriendshipRequest");

	if (data == NULL)
		return;

	MCONTACT hContact = *(MCONTACT*)data;
	delete (MCONTACT*)data;

	if (isOffline())
		return;

	ptrA id(getStringA(hContact, FACEBOOK_KEY_ID));
	if (!id)
		return;

	std::string query = "action=reject";
	query += "&id=" + std::string(id);
	query += "&__user=" + facy.self_.user_id;
	query += "&fb_dtsg=" + facy.dtsg_;

	// Ignore friendship request
	http::response resp = facy.flap(REQUEST_FRIENDSHIP, &query);

	if (resp.data.find("\"success\":true") != std::string::npos)
	{
		setByte(hContact, FACEBOOK_KEY_CONTACT_TYPE, CONTACT_NONE);
		NotifyEvent(m_tszUserName, TranslateT("Request for friendship was ignored."), NULL, FACEBOOK_EVENT_FRIENDSHIP);

		// Delete this contact, if he's temporary
		if (db_get_b(hContact, "CList", "NotOnList", 0))
			CallService(MS_DB_CONTACT_DELETE, hContact);
	}
	else facy.client_notify(TranslateT("Error occurred when ignoring friendship request."));

	if (resp.code != HTTP_CODE_OK)
		facy.handle_error("IgnoreFriendshipRequest");
}

void FacebookProto::SendPokeWorker(void *p)
{
	facy.handle_entry("SendPokeWorker");

	if (p == NULL)
		return;

	std::string *id = (std::string*)p;

	if (isOffline()) {
		delete id;
		return;
	}

	std::string data = "poke_target=" + *id;
	data += "&do_confirm=0";
	data += "&fb_dtsg=" + facy.dtsg_;
	data += "&__user=" + facy.self_.user_id;
	data += "&ttstamp=" + facy.ttstamp_;

	// Send poke
	http::response resp = facy.flap(REQUEST_POKE, &data);

	if (resp.data.find("\"payload\":null", 0) != std::string::npos) {
		resp.data = utils::text::slashu_to_utf8(
			utils::text::source_get_value(&resp.data, 2, "__html\":\"", "\"}"));

		std::string message = utils::text::source_get_value(&resp.data, 4, "<img", "<div", ">", "<\\/div>");

		if (message.empty()) // message has different format, show whole message
			message = resp.data;

		message = utils::text::html_entities_decode(
			utils::text::remove_html(message));

		ptrT tmessage(mir_utf8decodeT(message.c_str()));
		NotifyEvent(m_tszUserName, tmessage, NULL, FACEBOOK_EVENT_OTHER);
	}

	facy.handle_success("SendPokeWorker");

	delete id;
}


HANDLE FacebookProto::GetAwayMsg(MCONTACT)
{
	return 0; // Status messages are disabled
}

int FacebookProto::OnContactDeleted(WPARAM wParam, LPARAM)
{
	MCONTACT hContact = (MCONTACT)wParam;

	// Remove this contact from caches
	ptrA id(getStringA(hContact, FACEBOOK_KEY_ID));
	if (id)
		facy.user_id_to_hcontact.erase(std::string(id));

	ptrA tid(getStringA(hContact, FACEBOOK_KEY_TID));
	if (tid)
		facy.thread_id_to_user_id.erase(std::string(tid));

	if (isChatRoom(hContact)) {
		ptrA chat_id(getStringA(hContact, "ChatRoomID"));
		if (chat_id)
			facy.chat_id_to_hcontact.erase(std::string(chat_id));
	}

	// Cancel friendship (with confirmation)
	CancelFriendship(hContact, 1);

	return 0;
}


void FacebookProto::StartTyping(MCONTACT hContact) {
	// ignore if contact is already typing
	if (facy.typers.find(hContact) != facy.typers.end())
		return;

	// show notification and insert into typing set
	CallService(MS_PROTO_CONTACTISTYPING, hContact, (LPARAM)FACEBOOK_TYPING_TIME);
	facy.typers.insert(hContact);
}

void FacebookProto::StopTyping(MCONTACT hContact) {
	// ignore if contact is not typing
	if (facy.typers.find(hContact) == facy.typers.end())
		return;

	// show notification and remove from typing set
	CallService(MS_PROTO_CONTACTISTYPING, hContact, (LPARAM)PROTOTYPE_CONTACTTYPING_OFF);
	facy.typers.erase(hContact);
}