config_api.lua

local json = require ("json")

CURRENT_PATH = shell.dir()
Config = {}

function Config:new(name)
    local private = {}
        private.name = name

    local public = {}
        public.properties = {}
        function public:size()
            local count = 0
            for _, _ in pairs(public.properties) do
                count = count + 1
            end
            return count
        end

        function public:fetchFromFile()
            local file = io.open(CURRENT_PATH .. "/" .. private.name .. ".json", "r")
            if file == nil then
                return
            end

            io.input(file)
            local json_data_string = io.read("a");

            if (#json_data_string == 0) then
                io.close(file)
                return
            end

            public.properties = json.decode(json_data_string)
            io.close(file)
        end

        function public:updateFile()
            local file = io.open(CURRENT_PATH .. "/" .. private.name .. ".json", "w")
            if file == nil then
                return
            end

            io.output(file)
            local json_data = json.encode(public.properties)
            io.write(json_data)
            io.flush()
            io.close(file)
        end


    public:fetchFromFile()
    setmetatable(public, self)
    self.__index = self; return public
end

return {
    Config = Config
}