graphite/engine/utility/interdata.hpp

#pragma once

#include <string>
#include <map>
#include <json.hpp>
#include <glm/glm.hpp>

#include "utility.hpp"

/*
 * Our own intermediate data solution (used for saving/loading, etc)
 */

class IntermediateType
{
public:
    enum Type
    {
        String,
        SignedInteger,
        UnsignedInteger,
        Float,
        Vec3,
        Vec2,
        Quat,
        Bool
    };

    struct Data
    {
        std::string m_string;
        signed int m_integer;
        unsigned int m_unsignedInteger;
        float m_float;
        glm::vec3 m_vec3;
        glm::vec2 m_vec2;
        glm::quat m_quat;
        bool m_bool;
    };

    IntermediateType() {}
    ~IntermediateType() {}

    IntermediateType(const IntermediateType& copy)
    {
        m_data = copy.m_data;
        m_type = copy.m_type;
    }

    IntermediateType(const std::string& value)
    {
        m_data.m_string = value;
        m_type = String;
    }

    IntermediateType(signed int value)
    {
        m_data.m_integer = value;
        m_type = SignedInteger;
    }

    IntermediateType(unsigned int value)
    {
        m_data.m_unsignedInteger = value;
        m_type = UnsignedInteger;
    }

    IntermediateType(float value)
    {
        m_data.m_float = value;
        m_type = Float;
    }

    IntermediateType(glm::vec3 value)
    {
        m_data.m_vec3 = value;
        m_type = Vec3;
    }

    IntermediateType(glm::vec2 value)
    {
        m_data.m_vec2 = value;
        m_type = Vec2;
    }

    IntermediateType(glm::quat value)
    {
        m_data.m_quat = value;
        m_type = Quat;
    }

    IntermediateType(bool value)
    {
        m_data.m_bool = value;
        m_type = Bool;
    }

    IntermediateType& operator=(const IntermediateType& rhs)
    {
        m_data = rhs.m_data;
        m_type = rhs.m_type;

        return *this;
    }

    operator std::string&()
    {
        return m_data.m_string;
    }

    operator signed int&()
    {
        return m_data.m_integer;
    }

    operator unsigned int&()
    {
        return m_data.m_unsignedInteger;
    }

    operator float&()
    {
        //workaround:
        //our json library does NOT guarantee floats will be stored as floats
        if(m_type == SignedInteger)
        {
            m_data.m_float = static_cast<float>(m_data.m_integer);
        }
        else if(m_type == UnsignedInteger)
        {
            m_data.m_float = static_cast<float>(m_data.m_unsignedInteger);
        }

        return m_data.m_float;
    }

    operator glm::vec3&()
    {
        return m_data.m_vec3;
    }

    operator glm::vec2&()
    {
        return m_data.m_vec2;
    }

    operator glm::quat&()
    {
        return m_data.m_quat;
    }

    operator bool&()
    {
        return m_data.m_bool;
    }

    Type GetType() const
    {
        return m_type;
    }

    Data GetData() const
    {
        return m_data;
    }

private:
    Data m_data;
    Type m_type;
};

class IntermediateData
{
public:
    IntermediateData() {}
    ~IntermediateData() {}

    IntermediateData(const IntermediateData& inData)
    {
        data = inData.data;
    }

    IntermediateData(nlohmann::json json)
    {
        for(auto it = json.begin(); it != json.end(); it++)
        {
            std::string key = it.key();

            if(it.value().is_number_integer())
            {
                int val = it.value();
                data[key] = val;
            }

            if(it.value().is_boolean())
            {
                bool val = it.value();
                data[key] = val;
            }

            //crappy detection of vectors (since they are technically stored in strings)
            if(it.value().is_string())
            {
                std::string s = it.value();

                size_t n = std::count(s.begin(), s.end(), ',');
                switch(n)
                {
                    case 1:
                        data[key] = Utility::StringToVec2(s.c_str()); //vec2
                        break;
                    case 2:
                        data[key] = Utility::StringToVec3(s); //vec3
                        break;
                    case 3:
                        data[key] = Utility::StringToQuat(s.c_str()); //quat
                        break;
                    default:
                    {
                        if(Utility::IsFloat(s))
                        {
                            data[key] = stof(s);
                        }
                        else
                        {
                            data[key] = s; //if its actually a string
                        }
                    }
                    break;
                }
            }
        }
    }

    nlohmann::json GetJSON()
    {
        nlohmann::json tmp;
        for(auto itr : data)
        {
            switch(itr.second.GetType())
            {
                case IntermediateType::String:
                    tmp[itr.first] = itr.second.GetData().m_string;
                    break;
                case IntermediateType::SignedInteger:
                    tmp[itr.first] = itr.second.GetData().m_integer;
                    break;
                case IntermediateType::UnsignedInteger:
                    tmp[itr.first] = itr.second.GetData().m_unsignedInteger;
                    break;
                case IntermediateType::Float:
                    tmp[itr.first] = itr.second.GetData().m_float;
                    break;
                case IntermediateType::Vec3:
                    tmp[itr.first] = Utility::Vec3ToString(itr.second);
                    break;
                case IntermediateType::Vec2:
                    tmp[itr.first] = Utility::Vec2ToString(itr.second);
                    break;
                case IntermediateType::Quat:
                    tmp[itr.first] = Utility::QuatToString(itr.second);
                    break;
                case IntermediateType::Bool:
                    tmp[itr.first] = itr.second.GetData().m_bool;
                    break;
            }
        }

        return tmp;
    }

    auto& operator[](const std::string& key)
    {
        return data[key];
    }

    bool operator!=(IntermediateData& b)
    {
        return GetJSON() == b.GetJSON();
    }

    std::map<std::string, IntermediateType> data;
};