[
    {
        "name": "Same brand & class",
        "script": "strutils.equals_i(selected.Brand, tested.Brand) and strutils.equals_i(selected.CarClass, tested.CarClass)"
    },
    {
        "name": "Same era & class",
        "script": "selected.Year ~= nil and tested.Year ~= nil and math.abs(selected.Year - tested.Year) < 10 and strutils.equals_i(selected.CarClass, tested.CarClass)"
    },
    {
        "name": "Similar P/W ratio",
        /* only 5% difference */
        "script": "
            return function(tested)
                local selectedPwRatio = numutils.numvalue(selected.SpecsPwRatio)
                local testedPwRatio = numutils.numvalue(tested.SpecsPwRatio)
                return math.abs(selectedPwRatio - testedPwRatio) < selectedPwRatio * 0.05
            end"
    },
    {
        "name": "Same subclass only",
        "script": "
            return function(tested)
                local subclass = selected.Tags:FirstOrDefault(function (x) return string.sub(x, 1, 1) == '#' end)
                return tested.Tags:Contains(subclass)
            end"
    },
    {
        "name": "Same racing class (GT3/GT2/…)",
        "filter": "class:race",
        "script": "
            -- tags to search for
            classes = { 'gt3', 'gt2', '#GT4', '#90s touring' }

            -- try to find some tag in selected car
            racingclass = nil
            for i, cl in ipairs(classes) do
                if selected.Tags:ContainsIgnoringCase(cl) then
                    racingclass = cl
                    break
                end
            end

            -- logging
            if racingclass ~= nil then
                log('selected class: ' .. racingclass)
            else
                log('selected class: NIL')
            end

            -- in case there is no any tag at all, result is false
            if racingclass == nil then
                return false
            end

            -- result function which will try to find that tag in any tested car
            return function(tested)
                return tested.Tags:ContainsIgnoringCase(racingclass)
            end"
    },
    {
        "name": "Classic race cars",
        "filter": "class:race & year<1980"
    },
    {
        "name": "Modern race cars",
        "filter": "class:race & year>2000"
    },
]