local _M = {}

local listeners = {}

function _M.addListener(name, listener)
    if not name or not listener then return end
    if not listeners[name] then listeners[name] = {} end
    table.insert(listeners[name], listener)
end

function _M.removeListener(name, listener)
    if not name or not listener or not listeners[name] then return end
    local ind = table.indexOf(listeners[name], listener)
    if ind then table.remove(listeners[name], ind) end
end

function _M.dispatch(name, params)
    if not name or not listeners[name] then return end
    local l = listeners[name]
    for i = 1, #l do
        l[i](params and table.copy(params))
    end)
end

return _M