import time
from twisted.internet import reactor
from light9 import Submaster, dmxclient
from louie import dispatcher

class Output:
    lastsendtime=0
    lastsendlevs=None
    def __init__(self, subterms, music):
        self.subterms, self.music = subterms, music

        self.recent_t=[]
        self.later = None

        self.update()
        
    def update(self):
        d = self.music.current_time()
        d.addCallback(self.update2)
        d.addErrback(self.updateerr)
        
    def updateerr(self,e):

        print e.getTraceback()
        dispatcher.send("update status",val=e.getErrorMessage())
        if self.later and not self.later.cancelled and not self.later.called:
            self.later.cancel()
        self.later = reactor.callLater(1,self.update)
        
    def update2(self,t):
        # spot alsa soundcard offset is always 0, we get times about a
        # second ahead of what's really getting played
        #t = t - .7
        
        dispatcher.send("update status",
                        val="ok: receiving time from music player")
        if self.later and not self.later.cancelled and not self.later.called:
            self.later.cancel()

        self.later = reactor.callLater(.02, self.update)

        self.recent_t = self.recent_t[-50:]+[t]
        period = (self.recent_t[-1] - self.recent_t[0]) / len(self.recent_t)
        dispatcher.send("update period", val=period)
        self.send_dmx(t)
        
    def send_dmx(self,t):
        dispatcher.send("curves to sliders", t=t)
        scaledsubs=[]
        for st in self.subterms:
            scl = st.scaled(t)
            scaledsubs.append(scl)
        out = Submaster.sub_maxes(*scaledsubs)
        levs = out.get_levels()
        now=time.time()
        if now-self.lastsendtime>5 or levs!=self.lastsendlevs:
            dispatcher.send("output levels",val=levs)
            dmxclient.outputlevels(out.get_dmx_list(),
                                   twisted=1,clientid='curvecalc')
            self.lastsendtime = now
            self.lastsendlevs = levs