PowerToys/src/common/utils/json.h

#pragma once

#include <winrt/Windows.Foundation.h>
#include <winrt/Windows.Foundation.Collections.h>
#include <winrt/Windows.Data.Json.h>

#include <optional>
#include <fstream>

namespace json
{
    using namespace winrt::Windows::Data::Json;

    inline std::optional<JsonObject> from_file(std::wstring_view file_name)
    {
        try
        {
            std::ifstream file(file_name.data(), std::ios::binary);
            if (file.is_open())
            {
                using isbi = std::istreambuf_iterator<char>;
                std::string obj_str{ isbi{ file }, isbi{} };
                return JsonValue::Parse(winrt::to_hstring(obj_str)).GetObjectW();
            }
            return std::nullopt;
        }
        catch (...)
        {
            return std::nullopt;
        }
    }

    inline void to_file(std::wstring_view file_name, const JsonObject& obj)
    {
        std::wstring obj_str{ obj.Stringify().c_str() };
        std::ofstream{ file_name.data(), std::ios::binary } << winrt::to_string(obj_str);
    }

    inline bool has(
        const json::JsonObject& o,
        std::wstring_view name,
        const json::JsonValueType type = JsonValueType::Object)
    {
        return o.HasKey(name) && o.GetNamedValue(name).ValueType() == type;
    }

    template<typename T>
    inline std::enable_if_t<std::is_arithmetic_v<T>, JsonValue> value(const T arithmetic)
    {
        return json::JsonValue::CreateNumberValue(arithmetic);
    }

    template<typename T>
    inline std::enable_if_t<!std::is_arithmetic_v<T>, JsonValue> value(T s)
    {
        return json::JsonValue::CreateStringValue(s);
    }

    inline JsonValue value(const bool boolean)
    {
        return json::JsonValue::CreateBooleanValue(boolean);
    }

    inline JsonValue value(JsonObject value)
    {
        return value.as<JsonValue>();
    }

    inline JsonValue value(JsonValue value)
    {
        return value; // identity function overload for convenience
    }
}