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

using std::vector;

enum {
    RULE_MSG,
    RULE_CTCP,
    RULE_ACTION,
    RULE_NOTICE,
    RULE_PART,
    RULE_TOPIC,
    RULE_QUIT,
    RULE_MAX,
};

class CClearBufferOnMsgMod : public CModule {
  public:
    MODCONSTRUCTOR(CClearBufferOnMsgMod) {
        SetAllRules(true);
        // false for backward compatibility
        m_bRules[RULE_QUIT] = false;
    }

    void ClearAllBuffers() {
        CIRCNetwork* pNetwork = GetNetwork();

        if (pNetwork) {
            const vector<CChan*>& vChans = pNetwork->GetChans();

            for (CChan* pChan : vChans) {
                // Skip detached channels, they weren't read yet
                if (pChan->IsDetached()) continue;

                pChan->ClearBuffer();
                // We deny AutoClearChanBuffer on all channels since this module
                // doesn't make any sense with it
                pChan->SetAutoClearChanBuffer(false);
            }

            vector<CQuery*> VQueries = pNetwork->GetQueries();

            for (CQuery* pQuery : VQueries) {
                pNetwork->DelQuery(pQuery->GetName());
            }

            // We deny AutoClearQueryBuffer since this module
            // doesn't make any sense with it
            GetUser()->SetAutoClearQueryBuffer(false);
        }
    }

    EModRet OnUserMsg(CString& sTarget, CString& sMessage) override {
        if (m_bRules[RULE_MSG]) ClearAllBuffers();
        return CONTINUE;
    }

    EModRet OnUserCTCP(CString& sTarget, CString& sMessage) override {
        if (m_bRules[RULE_CTCP]) ClearAllBuffers();
        return CONTINUE;
    }

    EModRet OnUserAction(CString& sTarget, CString& sMessage) override {
        if (m_bRules[RULE_ACTION]) ClearAllBuffers();
        return CONTINUE;
    }

    EModRet OnUserNotice(CString& sTarget, CString& sMessage) override {
        if (m_bRules[RULE_NOTICE]) ClearAllBuffers();
        return CONTINUE;
    }

    EModRet OnUserPart(CString& sChannel, CString& sMessage) override {
        if (m_bRules[RULE_PART]) ClearAllBuffers();
        return CONTINUE;
    }

    EModRet OnUserTopic(CString& sChannel, CString& sTopic) override {
        if (m_bRules[RULE_TOPIC]) ClearAllBuffers();
        return CONTINUE;
    }

    EModRet OnUserQuit(CString& sMessage) override {
        if (m_bRules[RULE_QUIT]) ClearAllBuffers();
        return CONTINUE;
    }

    void SetAllRules(bool bVal) {
        for (int i = 0; i < RULE_MAX; i++) m_bRules[i] = bVal;
    }

    void SetRule(const CString& sOpt, bool bVal) {
        static const struct {
            CString sName;
            int Index;
        } Names[RULE_MAX] = {
              {"msg", RULE_MSG},
              {"ctcp", RULE_CTCP},
              {"action", RULE_ACTION},
              {"notice", RULE_NOTICE},
              {"part", RULE_PART},
              {"topic", RULE_TOPIC},
              {"quit", RULE_QUIT},
          };

        if (sOpt.Equals("all")) {
            SetAllRules(bVal);
        } else {
            for (int i = 0; i < RULE_MAX; i++) {
                if (sOpt.Equals(Names[i].sName))
                    m_bRules[Names[i].Index] = bVal;
            }
        }
    }

    bool OnLoad(const CString& sArgs, CString& sMessage) override {
        VCString vsOpts;

        sArgs.Split(" ", vsOpts, false);

        for (CString& sOpt : vsOpts) {
            if (sOpt.StartsWith("!"))
                SetRule(sOpt.substr(1), false);
            else if (!sOpt.empty())
                SetRule(sOpt, true);
        }

        return true;
    }

  private:
    bool m_bRules[RULE_MAX];
};

template <>
void TModInfo<CClearBufferOnMsgMod>(CModInfo& Info) {
    Info.SetWikiPage("clearbufferonmsg");
    Info.SetHasArgs(true);
    Info.SetArgsHelpText("[ [!]<msg|ctcp|action|notice|part|topic|quit|all> ]");
}

USERMODULEDEFS(CClearBufferOnMsgMod, t_s("Clears all channel and query buffers "
                                         "whenever the user does something"))
