class WireScan:
    Garage, W1X, W1Y, W2X, W2Y, Foil = "GARAGE", "W1X", "W1Y", "W2X", "W2Y", "Foil"

    def __init__(self, prefix, sel = None):
        self.prefix = prefix
        self.velocity = Channel(self.prefix + ":SCAN_VELO_SP")
        self.cycles = Channel(self.prefix + ":NB_CYCL_SP")
        self.currCycl = Channel(self.prefix + ":CURR_CYCL", callback = self.on_cycle_change)
        self.currCycl.set_monitored(True)
        #self.current_cycle = self.currCycl.get()
        self.selection = None
        self.u0 = None
        self.offset = None
        self.range = None
        self.start = None
        self.end = None
        if sel is not None:
            self.set_selection(sel)

    def on_cycle_change(self, val):
        print "On cycle chenge: ", val
        self.current_cycle = val

    def set_selection(self, sel):
        if not sel in [WireScan.Garage, WireScan.W1X, WireScan.W1Y, WireScan.W2X, WireScan.W2Y, WireScan.Foil]:
            raise Exception("Invalid Wire Scan selection: " + str(sel))
        self.selection = sel
        self.u0 = Channel(self.prefix + ":" + self.selection + "_U0_SP")
        self.offset = Channel(self.prefix + ":" + self.selection + "_OFF_SP")
        self.range = Channel(self.prefix + ":" + self.selection + "_RANGE_SP")
        self.start = Channel(self.prefix + ":" + self.selection + "_START_SP")
        self.end = Channel(self.prefix + ":" + self.selection + "_END_SP")

    def close(self):
        self.velocity.close()
        self.cycles.close()
        self.currCycl.close()
        if self.u0 is not None:  self.u0.close()
        if self.offset is not None:  self.offset.close()
        if self.range is not None:  self.range.close()
        if self.start is not None:  self.start.close()
        if self.end is not None:  self.end.close()