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#pragma once

#include <util/generic/ptr.h>
#include <util/generic/strbuf.h>

namespace NProtobufJson {
    class IJsonOutput { 
    public: 
        template <typename T> 
        IJsonOutput& Write(const T& t) { 
            DoWrite(t); 
            return *this; 
        } 
        IJsonOutput& WriteNull() { 
            DoWriteNull(); 
            return *this; 
        } 

        IJsonOutput& BeginList() { 
            DoBeginList(); 
            return *this; 
        } 
        IJsonOutput& EndList() { 
            DoEndList(); 
            return *this; 
        } 

        IJsonOutput& BeginObject() { 
            DoBeginObject(); 
            return *this; 
        } 
        IJsonOutput& WriteKey(const TStringBuf& key) { 
            DoWriteKey(key); 
            return *this; 
        } 
        IJsonOutput& EndObject() { 
            DoEndObject(); 
            return *this; 
        } 

        IJsonOutput& WriteRawJson(const TStringBuf& str) { 
            DoWriteRawJson(str); 
            return *this; 
        } 

        virtual ~IJsonOutput() { 
        } 

    protected: 
        virtual void DoWrite(const TStringBuf& s) = 0; 
        virtual void DoWrite(const TString& s) = 0; 
        virtual void DoWrite(int i) = 0; 
        void DoWrite(long i) { 
            DoWrite(static_cast<long long>(i)); 
        } 
        virtual void DoWrite(long long i) = 0; 
        virtual void DoWrite(unsigned int i) = 0; 
        void DoWrite(unsigned long i) { 
            DoWrite(static_cast<unsigned long long>(i)); 
        } 
        virtual void DoWrite(unsigned long long i) = 0; 
        virtual void DoWrite(float f) = 0; 
        virtual void DoWrite(double f) = 0; 
        virtual void DoWrite(bool b) = 0; 
        virtual void DoWriteNull() = 0; 

        virtual void DoBeginList() = 0; 
        virtual void DoEndList() = 0; 

        virtual void DoBeginObject() = 0; 
        virtual void DoWriteKey(const TStringBuf& key) = 0; 
        virtual void DoEndObject() = 0; 

        virtual void DoWriteRawJson(const TStringBuf& str) = 0; 
    }; 

    using TJsonMapOutputPtr = THolder<IJsonOutput>; 

}