local Pro2Timer = {}
Pro2Timer.__index = Pro2Timer

function Pro2Timer.new(tmrID, maxTime, led, cb, timerPeriod, toggleInt)
    local self = setmetatable({}, Pro2Timer)
    self.timer = tmr.attach(tmrID, timerPeriod or 10000, function() self:timer_callback() end)
    self.maxTime = maxTime
    self.curTime = self.maxTime
    self.maxLedToggleInterval = toggleInt or 3000
    self.ledToggleInterval = self.maxLedToggleInterval
    self.lastToggleTime = os.clock()
    self.led = led
    self.cb = cb or function() end
    self.timer:start()
    return self
end

function Pro2Timer:reload()
    self.timer:stop()
    self.led.off()
    self.curTime = self.maxTime
    self.ledToggleInterval = self.maxLedToggleInterval
    self.lastToggleTime = os.clock()
    self.timer:start()
end

function Pro2Timer:start()
    self.timer:start()
end

function Pro2Timer:stop()
    self.timer:stop()
end

function Pro2Timer:timer_callback()
    self.curTime = self.curTime - 0.01
    if self.curTime <= 0 then
        self.curTime = 0
        self.led.off()
        self.timer:stop()
        self.cb()
        return
    end

    if (os.clock() - self.lastToggleTime) * 1000 >= self.ledToggleInterval then
        self.led.inv()
        self.lastToggleTime = os.clock()

        self.ledToggleInterval = 1000 * (self.curTime / self.maxTime)
        if self.ledToggleInterval < 10 then self.ledToggleInterval = 10 end
    end
end

return Pro2Timer