#include "GraphicsViewStyle.hpp"

#include <QtCore/QFile>
#include <QtCore/QJsonArray>
#include <QtCore/QJsonObject>
#include <QtCore/QJsonValueRef>

#include "StyleCollection.hpp"

using QtNodes::GraphicsViewStyle;

inline void initResources()
{
    Q_INIT_RESOURCE(resources);
}

GraphicsViewStyle::GraphicsViewStyle()
{
    // Explicit resources inialization for preventing the static initialization
    // order fiasco: https://isocpp.org/wiki/faq/ctors#static-init-order
    initResources();

    // This configuration is stored inside the compiled unit and is loaded statically
    loadJsonFile(":DefaultStyle.json");
}

GraphicsViewStyle::GraphicsViewStyle(QString jsonText)
{
    loadJsonText(jsonText);
}

void GraphicsViewStyle::setStyle(QString jsonText)
{
    GraphicsViewStyle style(jsonText);

    StyleCollection::setGraphicsViewStyle(style);
}

#ifdef STYLE_DEBUG
#define FLOW_VIEW_STYLE_CHECK_UNDEFINED_VALUE(v, variable) \
    { \
        if (v.type() == QJsonValue::Undefined || v.type() == QJsonValue::Null) \
            qWarning() << "Undefined value for parameter:" << #variable; \
    }
#else
#define FLOW_VIEW_STYLE_CHECK_UNDEFINED_VALUE(v, variable)
#endif

#define FLOW_VIEW_STYLE_READ_COLOR(values, variable) \
    { \
        auto valueRef = values[#variable]; \
        FLOW_VIEW_STYLE_CHECK_UNDEFINED_VALUE(valueRef, variable) \
        if (valueRef.isArray()) { \
            auto colorArray = valueRef.toArray(); \
            std::vector<int> rgb; \
            rgb.reserve(3); \
            for (auto it = colorArray.begin(); it != colorArray.end(); ++it) { \
                rgb.push_back((*it).toInt()); \
            } \
            variable = QColor(rgb[0], rgb[1], rgb[2]); \
        } else { \
            variable = QColor(valueRef.toString()); \
        } \
    }

#define FLOW_VIEW_STYLE_WRITE_COLOR(values, variable) \
    { \
        values[#variable] = variable.name(); \
    }

void GraphicsViewStyle::loadJson(QJsonObject const &json)
{
    QJsonValue nodeStyleValues = json["GraphicsViewStyle"];

    QJsonObject obj = nodeStyleValues.toObject();

    FLOW_VIEW_STYLE_READ_COLOR(obj, BackgroundColor);
    FLOW_VIEW_STYLE_READ_COLOR(obj, FineGridColor);
    FLOW_VIEW_STYLE_READ_COLOR(obj, CoarseGridColor);
}

QJsonObject GraphicsViewStyle::toJson() const
{
    QJsonObject obj;

    FLOW_VIEW_STYLE_WRITE_COLOR(obj, BackgroundColor);
    FLOW_VIEW_STYLE_WRITE_COLOR(obj, FineGridColor);
    FLOW_VIEW_STYLE_WRITE_COLOR(obj, CoarseGridColor);

    QJsonObject root;
    root["GraphicsViewStyle"] = obj;

    return root;
}