/* ns_maxemail.cpp - Limit the amount of times an email address
 *                   can be used for a NickServ account.
 *
 * (C) 2003-2016 Anope Team
 * Contact us at team@anope.org
 *
 * Included in the Anope module pack since Anope 1.7.9
 * Anope Coder: GeniusDex <geniusdex@anope.org>
 *
 * Please read COPYING and README for further details.
 */

#include "module.h"

class NSMaxEmail : public Module
{
	bool CheckLimitReached(CommandSource &source, const Anope::string &email)
	{
		int NSEmailMax = Config->GetModule(this)->Get<int>("maxemails");

		if (NSEmailMax < 1 || email.empty())
			return false;

		if (this->CountEmail(email, source.nc) < NSEmailMax)
			return false;

		if (NSEmailMax == 1)
			source.Reply(_("The email address \002%s\002 has reached its usage limit of 1 user."), email.c_str());
		else
			source.Reply(_("The email address \002%s\002 has reached its usage limit of %d users."), email.c_str(), NSEmailMax);

		return true;
	}

	int CountEmail(const Anope::string &email, NickCore *unc)
	{
		int count = 0;

		if (email.empty())
			return 0;

		for (nickcore_map::const_iterator it = NickCoreList->begin(), it_end = NickCoreList->end(); it != it_end; ++it)
		{
			const NickCore *nc = it->second;

			if (unc != nc && !nc->email.empty() && nc->email.equals_ci(email))
				++count;
		}

		return count;
	}

 public:
	NSMaxEmail(const Anope::string &modname, const Anope::string &creator) : Module(modname, creator, VENDOR)
	{
	}

	EventReturn OnPreCommand(CommandSource &source, Command *command, std::vector<Anope::string> &params) anope_override
	{
		if (source.IsOper())
			return EVENT_CONTINUE;

		if (command->name == "nickserv/register")
		{
			if (this->CheckLimitReached(source, params.size() > 1 ? params[1] : ""))
				return EVENT_STOP;
		}
		else if (command->name == "nickserv/set/email")
		{
			if (this->CheckLimitReached(source, params.size() > 0 ? params[0] : ""))
				return EVENT_STOP;
		}
		else if (command->name == "nickserv/ungroup" && source.GetAccount())
		{
			if (this->CheckLimitReached(source, source.GetAccount()->email))
				return EVENT_STOP;
		}

		return EVENT_CONTINUE;
	}
};

MODULE_INIT(NSMaxEmail)