/* Registered channel functions
 *
 * (C) 2003-2022 Anope Team
 * Contact us at team@anope.org
 *
 * Please read COPYING and README for further details.
 *
 * Based on the original code of Epona by Lara.
 * Based on the original code of Services by Andy Church.
 */

#include "services.h"
#include "modules.h"
#include "regchannel.h"
#include "account.h"
#include "access.h"
#include "channels.h"
#include "config.h"
#include "bots.h"
#include "servers.h"

Serialize::Checker<registered_channel_map> RegisteredChannelList("ChannelInfo");

AutoKick::AutoKick() : Serializable("AutoKick")
{
}

AutoKick::~AutoKick()
{
	if (this->ci)
	{
		std::vector<AutoKick *>::iterator it = std::find(this->ci->akick->begin(), this->ci->akick->end(), this);
		if (it != this->ci->akick->end())
			this->ci->akick->erase(it);

		if (nc)
			nc->RemoveChannelReference(this->ci);
	}
}

void AutoKick::Serialize(Serialize::Data &data) const
{
	data["ci"] << this->ci->name;
	if (this->nc)
		data["nc"] << this->nc->display;
	else
		data["mask"] << this->mask;
	data["reason"] << this->reason;
	data["creator"] << this->creator;
	data.SetType("addtime", Serialize::Data::DT_INT); data["addtime"] << this->addtime;
	data.SetType("last_used", Serialize::Data::DT_INT); data["last_used"] << this->last_used;
}

Serializable* AutoKick::Unserialize(Serializable *obj, Serialize::Data &data)
{
	Anope::string sci, snc;

	data["ci"] >> sci;
	data["nc"] >> snc;

	ChannelInfo *ci = ChannelInfo::Find(sci);
	if (!ci)
		return NULL;

	AutoKick *ak;
	NickCore *nc = NickCore::Find(snc);
	if (obj)
	{
		ak = anope_dynamic_static_cast<AutoKick *>(obj);
		data["creator"] >> ak->creator;
		data["reason"] >> ak->reason;
		ak->nc = NickCore::Find(snc);
		data["mask"] >> ak->mask;
		data["addtime"] >> ak->addtime;
		data["last_used"] >> ak->last_used;
	}
	else
	{
		time_t addtime, lastused;
		data["addtime"] >> addtime;
		data["last_used"] >> lastused;

		Anope::string screator, sreason, smask;

		data["creator"] >> screator;
		data["reason"] >> sreason;
		data["mask"] >> smask;

		if (nc)
			ak = ci->AddAkick(screator, nc, sreason, addtime, lastused);
		else
			ak = ci->AddAkick(screator, smask, sreason, addtime, lastused);
	}

	return ak;
}

ChannelInfo::ChannelInfo(const Anope::string &chname) : Serializable("ChannelInfo"),
	access("ChanAccess"), akick("AutoKick")
{
	if (chname.empty())
		throw CoreException("Empty channel passed to ChannelInfo constructor");

	this->founder = NULL;
	this->successor = NULL;
	this->c = Channel::Find(chname);
	if (this->c)
		this->c->ci = this;
	this->banexpire = 0;
	this->bi = NULL;
	this->last_topic_time = 0;

	this->name = chname;

	this->bantype = 2;
	this->memos.memomax = 0;
	this->last_used = this->time_registered = Anope::CurTime;

	size_t old = RegisteredChannelList->size();
	(*RegisteredChannelList)[this->name] = this;
	if (old == RegisteredChannelList->size())
		Log(LOG_DEBUG) << "Duplicate channel " << this->name << " in registered channel table?";

	FOREACH_MOD(OnCreateChan, (this));
}

ChannelInfo::ChannelInfo(const ChannelInfo &ci) : Serializable("ChannelInfo"),
	access("ChanAccess"), akick("AutoKick")
{
	*this = ci;

	if (this->founder)
		++this->founder->channelcount;

	this->access->clear();
	this->akick->clear();

	FOREACH_MOD(OnCreateChan, (this));
}

ChannelInfo::~ChannelInfo()
{
	FOREACH_MOD(OnDelChan, (this));

	UnsetExtensibles();

	Log(LOG_DEBUG) << "Deleting channel " << this->name;

	if (this->c)
	{
		if (this->bi && this->c->FindUser(this->bi))
			this->bi->Part(this->c);

		/* Parting the service bot can cause the channel to go away */

		if (this->c)
		{
			if (this->c && this->c->CheckDelete())
				this->c->QueueForDeletion();

			this->c = NULL;
		}
	}

	RegisteredChannelList->erase(this->name);

	this->SetFounder(NULL);
	this->SetSuccessor(NULL);

	this->ClearAccess();
	this->ClearAkick();

	if (!this->memos.memos->empty())
	{
		for (unsigned i = 0, end = this->memos.memos->size(); i < end; ++i)
			delete this->memos.GetMemo(i);
		this->memos.memos->clear();
	}
}

void ChannelInfo::Serialize(Serialize::Data &data) const
{
	data["name"] << this->name;
	if (this->founder)
		data["founder"] << this->founder->display;
	if (this->successor)
		data["successor"] << this->successor->display;
	data["description"] << this->desc;
	data.SetType("time_registered", Serialize::Data::DT_INT); data["time_registered"] << this->time_registered;
	data.SetType("last_used", Serialize::Data::DT_INT); data["last_used"] << this->last_used;
	data["last_topic"] << this->last_topic;
	data["last_topic_setter"] << this->last_topic_setter;
	data.SetType("last_topic_time", Serialize::Data::DT_INT); data["last_topic_time"] << this->last_topic_time;
	data.SetType("bantype", Serialize::Data::DT_INT); data["bantype"] << this->bantype;
	{
		Anope::string levels_buffer;
		for (Anope::map<int16_t>::const_iterator it = this->levels.begin(), it_end = this->levels.end(); it != it_end; ++it)
			levels_buffer += it->first + " " + stringify(it->second) + " ";
		data["levels"] << levels_buffer;
	}
	if (this->bi)
		data["bi"] << this->bi->nick;
	data.SetType("banexpire", Serialize::Data::DT_INT); data["banexpire"] << this->banexpire;
	data["memomax"] << this->memos.memomax;
	for (unsigned i = 0; i < this->memos.ignores.size(); ++i)
		data["memoignores"] << this->memos.ignores[i] << " ";

	Extensible::ExtensibleSerialize(this, this, data);
}

Serializable* ChannelInfo::Unserialize(Serializable *obj, Serialize::Data &data)
{
	Anope::string sname, sfounder, ssuccessor, slevels, sbi;

	data["name"] >> sname;
	data["founder"] >> sfounder;
	data["successor"] >> ssuccessor;
	data["levels"] >> slevels;
	data["bi"] >> sbi;

	ChannelInfo *ci;
	if (obj)
		ci = anope_dynamic_static_cast<ChannelInfo *>(obj);
	else
		ci = new ChannelInfo(sname);

	ci->SetFounder(NickCore::Find(sfounder));
	ci->SetSuccessor(NickCore::Find(ssuccessor));

	data["description"] >> ci->desc;
	data["time_registered"] >> ci->time_registered;
	data["last_used"] >> ci->last_used;
	data["last_topic"] >> ci->last_topic;
	data["last_topic_setter"] >> ci->last_topic_setter;
	data["last_topic_time"] >> ci->last_topic_time;
	data["bantype"] >> ci->bantype;
	{
		std::vector<Anope::string> v;
		spacesepstream(slevels).GetTokens(v);
		for (unsigned i = 0; i + 1 < v.size(); i += 2)
			try
			{
				ci->levels[v[i]] = convertTo<int16_t>(v[i + 1]);
			}
			catch (const ConvertException &) { }
	}
	BotInfo *bi = BotInfo::Find(sbi, true);
	if (*ci->bi != bi)
	{
		if (bi)
			bi->Assign(NULL, ci);
		else if (ci->bi)
			ci->bi->UnAssign(NULL, ci);
	}
	data["banexpire"] >> ci->banexpire;
	data["memomax"] >> ci->memos.memomax;
	{
		Anope::string buf;
		data["memoignores"] >> buf;
		spacesepstream sep(buf);
		ci->memos.ignores.clear();
		while (sep.GetToken(buf))
			ci->memos.ignores.push_back(buf);
	}

	Extensible::ExtensibleUnserialize(ci, ci, data);

	/* compat */
	bool b;
	b = false;
	data["extensible:SECURE"] >> b;
	if (b)
		ci->Extend<bool>("CS_SECURE");
	b = false;
	data["extensible:PRIVATE"] >> b;
	if (b)
		ci->Extend<bool>("CS_PRIVATE");
	b = false;
	data["extensible:NO_EXPIRE"] >> b;
	if (b)
		ci->Extend<bool>("CS_NO_EXPIRE");
	b = false;
	data["extensible:FANTASY"] >> b;
	if (b)
		ci->Extend<bool>("BS_FANTASY");
	b = false;
	data["extensible:GREET"] >> b;
	if (b)
		ci->Extend<bool>("BS_GREET");
	b = false;
	data["extensible:PEACE"] >> b;
	if (b)
		ci->Extend<bool>("PEACE");
	b = false;
	data["extensible:SECUREFOUNDER"] >> b;
	if (b)
		ci->Extend<bool>("SECUREFOUNDER");
	b = false;
	data["extensible:RESTRICTED"] >> b;
	if (b)
		ci->Extend<bool>("RESTRICTED");
	b = false;
	data["extensible:KEEPTOPIC"] >> b;
	if (b)
		ci->Extend<bool>("KEEPTOPIC");
	b = false;
	data["extensible:SIGNKICK"] >> b;
	if (b)
		ci->Extend<bool>("SIGNKICK");
	b = false;
	data["extensible:SIGNKICK_LEVEL"] >> b;
	if (b)
		ci->Extend<bool>("SIGNKICK_LEVEL");
	/* end compat */

	return ci;
}


void ChannelInfo::SetFounder(NickCore *nc)
{
	if (this->founder)
	{
		--this->founder->channelcount;
		this->founder->RemoveChannelReference(this);
	}

	this->founder = nc;

	if (this->founder)
	{
		++this->founder->channelcount;
		this->founder->AddChannelReference(this);
	}
}

NickCore *ChannelInfo::GetFounder() const
{
	return this->founder;
}

void ChannelInfo::SetSuccessor(NickCore *nc)
{
	if (this->successor)
		this->successor->RemoveChannelReference(this);
	this->successor = nc;
	if (this->successor)
		this->successor->AddChannelReference(this);
}

NickCore *ChannelInfo::GetSuccessor() const
{
	return this->successor;
}

BotInfo *ChannelInfo::WhoSends() const
{
	if (this && this->bi)
		return this->bi;

	BotInfo *ChanServ = Config->GetClient("ChanServ");
	if (ChanServ)
		return ChanServ;

	if (!BotListByNick->empty())
		return BotListByNick->begin()->second;

	return NULL;
}

void ChannelInfo::AddAccess(ChanAccess *taccess)
{
	this->access->push_back(taccess);
}

ChanAccess *ChannelInfo::GetAccess(unsigned index) const
{
	if (this->access->empty() || index >= this->access->size())
		return NULL;

	ChanAccess *acc = (*this->access)[index];
	acc->QueueUpdate();
	return acc;
}

static void FindMatchesRecurse(ChannelInfo *ci, const User *u, const NickCore *account, unsigned int depth, std::vector<ChanAccess::Path> &paths, ChanAccess::Path &path)
{
	if (depth > ChanAccess::MAX_DEPTH)
		return;

	for (unsigned int i = 0; i < ci->GetAccessCount(); ++i)
	{
		ChanAccess *a = ci->GetAccess(i);
		ChannelInfo *next = NULL;

		if (a->Matches(u, account, next))
		{
			ChanAccess::Path next_path = path;
			next_path.push_back(a);

			paths.push_back(next_path);
		}
		else if (next)
		{
			ChanAccess::Path next_path = path;
			next_path.push_back(a);

			FindMatchesRecurse(next, u, account, depth + 1, paths, next_path);
		}
	}
}

static void FindMatches(AccessGroup &group, ChannelInfo *ci, const User *u, const NickCore *account)
{
	ChanAccess::Path path;
	FindMatchesRecurse(ci, u, account, 0, group.paths, path);
}

AccessGroup ChannelInfo::AccessFor(const User *u, bool updateLastUsed)
{
	AccessGroup group;

	if (u == NULL)
		return group;

	const NickCore *nc = u->Account();
	if (nc == NULL && !this->HasExt("NS_SECURE") && u->IsRecognized())
	{
		const NickAlias *na = NickAlias::Find(u->nick);
		if (na != NULL)
			nc = na->nc;
	}

	group.super_admin = u->super_admin;
	group.founder = IsFounder(u, this);
	group.ci = this;
	group.nc = nc;

	FindMatches(group, this, u, u->Account());

	if (group.founder || !group.paths.empty())
	{
		if (updateLastUsed)
			this->last_used = Anope::CurTime;

		for (unsigned i = 0; i < group.paths.size(); ++i)
		{
			ChanAccess::Path &p = group.paths[i];

			for (unsigned int j = 0; j < p.size(); ++j)
				p[j]->last_seen = Anope::CurTime;
		}
	}

	return group;
}

AccessGroup ChannelInfo::AccessFor(const NickCore *nc, bool updateLastUsed)
{
	AccessGroup group;

	group.founder = (this->founder && this->founder == nc);
	group.ci = this;
	group.nc = nc;

	FindMatches(group, this, NULL, nc);

	if (group.founder || !group.paths.empty())
		if (updateLastUsed)
			this->last_used = Anope::CurTime;

	/* don't update access last seen here, this isn't the user requesting access */

	return group;
}

unsigned ChannelInfo::GetAccessCount() const
{
	return this->access->size();
}

static unsigned int GetDeepAccessCount(const ChannelInfo *ci, std::set<const ChannelInfo *> &seen, unsigned int depth)
{
	if (depth > ChanAccess::MAX_DEPTH || seen.count(ci))
		return 0;
	seen.insert(ci);

	unsigned int total = 0;

	for (unsigned int i = 0; i < ci->GetAccessCount(); ++i)
	{
		ChanAccess::Path path;
		ChanAccess *a = ci->GetAccess(i);
		ChannelInfo *next = NULL;

		a->Matches(NULL, NULL, next);
		++total;

		if (next)
			total += GetDeepAccessCount(ci, seen, depth + 1);
	}

	return total;
}

unsigned ChannelInfo::GetDeepAccessCount() const
{
	std::set<const ChannelInfo *> seen;
	return ::GetDeepAccessCount(this, seen, 0);
}

ChanAccess *ChannelInfo::EraseAccess(unsigned index)
{
	if (this->access->empty() || index >= this->access->size())
		return NULL;

	ChanAccess *ca = this->access->at(index);
	this->access->erase(this->access->begin() + index);
	return ca;
}

void ChannelInfo::ClearAccess()
{
	for (unsigned i = this->access->size(); i > 0; --i)
		delete this->GetAccess(i - 1);
}

AutoKick *ChannelInfo::AddAkick(const Anope::string &user, NickCore *akicknc, const Anope::string &reason, time_t t, time_t lu)
{
	AutoKick *autokick = new AutoKick();
	autokick->ci = this;
	autokick->nc = akicknc;
	autokick->reason = reason;
	autokick->creator = user;
	autokick->addtime = t;
	autokick->last_used = lu;

	this->akick->push_back(autokick);

	akicknc->AddChannelReference(this);

	return autokick;
}

AutoKick *ChannelInfo::AddAkick(const Anope::string &user, const Anope::string &mask, const Anope::string &reason, time_t t, time_t lu)
{
	AutoKick *autokick = new AutoKick();
	autokick->ci = this;
	autokick->mask = mask;
	autokick->nc = NULL;
	autokick->reason = reason;
	autokick->creator = user;
	autokick->addtime = t;
	autokick->last_used = lu;

	this->akick->push_back(autokick);

	return autokick;
}

AutoKick *ChannelInfo::GetAkick(unsigned index) const
{
	if (this->akick->empty() || index >= this->akick->size())
		return NULL;

	AutoKick *ak = (*this->akick)[index];
	ak->QueueUpdate();
	return ak;
}

unsigned ChannelInfo::GetAkickCount() const
{
	return this->akick->size();
}

void ChannelInfo::EraseAkick(unsigned index)
{
	if (this->akick->empty() || index >= this->akick->size())
		return;

	delete this->GetAkick(index);
}

void ChannelInfo::ClearAkick()
{
	while (!this->akick->empty())
		delete this->akick->back();
}

const Anope::map<int16_t> &ChannelInfo::GetLevelEntries()
{
	return this->levels;
}

int16_t ChannelInfo::GetLevel(const Anope::string &priv) const
{
	if (PrivilegeManager::FindPrivilege(priv) == NULL)
	{
		Log(LOG_DEBUG) << "Unknown privilege " + priv;
		return ACCESS_INVALID;
	}

	Anope::map<int16_t>::const_iterator it = this->levels.find(priv);
	if (it == this->levels.end())
		return 0;
	return it->second;
}

void ChannelInfo::SetLevel(const Anope::string &priv, int16_t level)
{
	if (PrivilegeManager::FindPrivilege(priv) == NULL)
	{
		Log(LOG_DEBUG) << "Unknown privilege " + priv;
		return;
	}

	this->levels[priv] = level;
}

void ChannelInfo::RemoveLevel(const Anope::string &priv)
{
	this->levels.erase(priv);
}

void ChannelInfo::ClearLevels()
{
	this->levels.clear();
}

Anope::string ChannelInfo::GetIdealBan(User *u) const
{
	int bt = this ? this->bantype : -1;
	switch (bt)
	{
		case 0:
			return "*!" + u->GetVIdent() + "@" + u->GetDisplayedHost();
		case 1:
			if (u->GetVIdent()[0] == '~')
				return "*!*" + u->GetVIdent() + "@" + u->GetDisplayedHost();
			else
				return "*!" + u->GetVIdent() + "@" + u->GetDisplayedHost();
		case 3:
			return "*!" + u->Mask();
		case 2:
		default:
			return "*!*@" + u->GetDisplayedHost();
	}
}

ChannelInfo* ChannelInfo::Find(const Anope::string &name)
{
	registered_channel_map::const_iterator it = RegisteredChannelList->find(name);
	if (it != RegisteredChannelList->end())
	{
		it->second->QueueUpdate();
		return it->second;
	}

	return NULL;
}

bool IsFounder(const User *user, const ChannelInfo *ci)
{
	if (!user || !ci)
		return false;

	if (user->super_admin)
		return true;

	if (user->Account() && user->Account() == ci->GetFounder())
		return true;

	return false;
}


void ChannelInfo::AddChannelReference(const Anope::string &what)
{
	++references[what];
}

void ChannelInfo::RemoveChannelReference(const Anope::string &what)
{
	int &i = references[what];
	if (--i <= 0)
		references.erase(what);
}

void ChannelInfo::GetChannelReferences(std::deque<Anope::string> &chans)
{
	chans.clear();
	for (Anope::map<int>::iterator it = references.begin(); it != references.end(); ++it)
		chans.push_back(it->first);
}
