/*
 * Copyright (C) 2004-2020 ZNC, see the NOTICE file for details.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <znc/Chan.h>
#include <znc/User.h>
#include <znc/IRCNetwork.h>

class CChanSaverMod : public CModule {
  public:
    MODCONSTRUCTOR(CChanSaverMod) {}

    ~CChanSaverMod() override {}

    bool OnLoad(const CString& sArgsi, CString& sMessage) override {
        switch (GetType()) {
            case CModInfo::GlobalModule:
                LoadUsers();
                break;
            case CModInfo::UserModule:
                LoadUser(GetUser());
                break;
            case CModInfo::NetworkModule:
                LoadNetwork(GetNetwork());
                break;
        }
        return true;
    }

    void LoadUsers() {
        const std::map<CString, CUser*>& vUsers = CZNC::Get().GetUserMap();
        for (const auto& user : vUsers) {
            LoadUser(user.second);
        }
    }

    void LoadUser(CUser* pUser) {
        const std::vector<CIRCNetwork*>& vNetworks = pUser->GetNetworks();
        for (const CIRCNetwork* pNetwork : vNetworks) {
            LoadNetwork(pNetwork);
        }
    }

    void LoadNetwork(const CIRCNetwork* pNetwork) {
        const std::vector<CChan*>& vChans = pNetwork->GetChans();
        for (CChan* pChan : vChans) {
            // If that channel isn't yet in the config,
            // we'll have to add it...
            if (!pChan->InConfig()) {
                pChan->SetInConfig(true);
            }
        }
    }

    void OnJoin(const CNick& Nick, CChan& Channel) override {
        if (!Channel.InConfig() &&
            GetNetwork()->GetIRCNick().NickEquals(Nick.GetNick())) {
            Channel.SetInConfig(true);
        }
    }

    void OnPart(const CNick& Nick, CChan& Channel,
                const CString& sMessage) override {
        if (Channel.InConfig() &&
            GetNetwork()->GetIRCNick().NickEquals(Nick.GetNick())) {
            Channel.SetInConfig(false);
        }
    }
};

template <>
void TModInfo<CChanSaverMod>(CModInfo& Info) {
    Info.SetWikiPage("chansaver");
    Info.AddType(CModInfo::NetworkModule);
    Info.AddType(CModInfo::GlobalModule);
}

USERMODULEDEFS(CChanSaverMod,
               t_s("Keeps config up-to-date when user joins/parts."))
