# sfputil.py
#
# Platform-specific SFP transceiver interface for SONiC
#

try:
    import time
    from sonic_sfp.sfputilbase import SfpUtilBase
    import os
    import sys, getopt
    from minipack.pimutil import PimUtil 
except ImportError as e:
    raise ImportError("%s - required module not found" % str(e))


class SfpUtil(SfpUtilBase):
    """Platform-specific SfpUtil class"""
    
    PORT_START = 0
    PORT_END = 128
    
    LOCAL_OOM_PATH = "/usr/local/bin/minipack_qsfp/port%d_eeprom"
    
    _port_to_is_present = {}
    _port_to_lp_mode = {}

    _port_to_eeprom_mapping = {}

    @property
    def port_start(self):
        return self.PORT_START

    @property
    def port_end(self):
        return self.PORT_END
   
    @property
    def qsfp_ports(self):
        return range(self.PORT_START, self.PORT_END + 1)

    @property
    def port_to_eeprom_mapping(self):
        return self._port_to_eeprom_mapping

    def sfp_map(self, index):
        port = index + 1
        base = ((port-1)/8*8) + 10
        index = (port - 1) % 8
        index = 7 - index
        if (index%2):
            index = index -1
        else:
            index = index +1
        bus = base + index
        return bus


    def __init__(self):
        for x in range(0, self.port_end):           
            self.port_to_eeprom_mapping[x] = self.LOCAL_OOM_PATH %x

        SfpUtilBase.__init__(self)
        pim=PimUtil()
        pim.init_pim_fpga()
    
    def __del__(self):
        self.value=0                

    def get_presence(self, port_num):
        # Check for invalid port_num
        if port_num < self.port_start or port_num > self.port_end:
            return False

        pim=PimUtil()
        status=pim.get_qsfp_presence(port_num)
        return status
    
    def get_low_power_mode(self, port_num): 
        if port_num < self.port_start or port_num > self.port_end:
            return False

        pim=PimUtil()
        return pim.get_low_power_mode(port_num)
        
    def set_low_power_mode(self, port_num, lpmode):
        if port_num < self.port_start or port_num > self.port_end:
            return False
        pim=PimUtil()
        pim.set_low_power_mode(port_num, lpmode)         
        return True 

    def reset(self, port_num):
        if port_num < self.port_start or port_num > self.port_end:
            return False
        pim=PimUtil()
        pim.reset(port_num)
        return True        
  
    def get_transceiver_change_event(self, timeout=0):
        pim=PimUtil()
        start_time = time.time()
        port_dict = {}
        forever = False
        
        if timeout == 0:
            forever = True
        elif timeout > 0:
            timeout = timeout / float(1000) # Convert to secs
        else:
            print "get_transceiver_change_event:Invalid timeout value", timeout
            return False, {}

        end_time = start_time + timeout
        if start_time > end_time:
            print 'get_transceiver_change_event:' \
                       'time wrap / invalid timeout value', timeout

            return False, {} # Time wrap or possibly incorrect timeout
       
        while timeout >= 0: 
            change_status=0
            port_dict = pim.get_qsfp_interrupt()
            present=0
            for key, value in port_dict.iteritems():
                if value==1:
                    present=self.get_presence(key)
                    change_status=1
                    if present:
                        port_dict[key]='1'
                    else:
                        port_dict[key]='0'
               
            if change_status:               
                return True, port_dict
            if forever:
                time.sleep(1)
            else:
                timeout = end_time - time.time()
                if timeout >= 1:
                    time.sleep(1) # We poll at 1 second granularity
                else:
                    if timeout > 0:
                        time.sleep(timeout)
                    return True, {}
        print "get_evt_change_event: Should not reach here."
        return False, {}