-- @name koptilnya/libs/utils
function checkVarClass(var, class, message)
    if type(var) ~= "table" or var["class"] == nil or not var:isInstanceOf(class) then
        throw(message == nil and "Wrong variable class." or message, 1, true)
    end
end

function accessorFunc(tbl, varName, name, defaultValue)
    tbl[varName] = defaultValue
    tbl["get" .. name] = function(self)
        return self[varName]
    end
    tbl["set" .. name] = function(self, value)
        self[varName] = value
    end
end

function rotateAround(entity, pivot, angles)
    local pos = entity:getPos()
    local localPivotPos = entity:worldToLocal(pivot)

    entity:setAngles(angles)
    pos = pos + (pivot - entity:localToWorld(localPivotPos))
    entity:setPos(pos)
end

function tobase(number, base)
    local ret = ""

    if base < 2 or base > 36 or number == 0 then
        return "0"
    end

    if base == 10 then
        return tostring(number)
    end

    local chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    local loops = 0
    while number > 0 do
        loops = loops + 1
        number, d = math.floor(number / base), (number % base) + 1
        ret = string.sub(chars, d, d) .. ret
        if (loops > 32000) then
            break
        end
    end
    return ret
end

function bytesToHex(bytes)
    local hex = "0x"

    for _, v in pairs(bytes) do
        hex = hex .. bit.tohex(v, 2)
    end

    return hex
end

function byteTable(str, start, length)
    local result = {}

    for i = 1, length do
        result[i] = string.byte(str, i + start - 1)
    end

    return result
end

function isURL(str)
    local _1, _2, prefix = str:find("^(%w-):")

    return prefix == "http" or prefix == "https" or prefix == "data"
end