#!/usr/bin/env python

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


class SfpUtil(SfpUtilBase):
    """Platform-specific SfpUtil class"""

    PORT_START = 1
    PORT_END = 52
    port_to_i2c_mapping = {
         1: None,
         2: None,
         3: None,
         4: None,
         5: None,
         6: None,
         7: None,
         8: None,
         9: None,
        10: None,
        11: None,
        12: None,
        13: None,
        14: None,
        15: None,
        16: None,
        17: None,
        18: None,
        19: None,
        20: None,
        21: None,
        22: None,
        23: None,
        24: None,
        25: None,
        26: None,
        27: None,
        28: None,
        29: None,
        30: None,
        31: None,
        32: None,
        33: None,
        34: None,
        35: None,
        36: None,
        37: None,
        38: None,
        39: None,
        40: None,
        41: None,
        42: None,
        43: None,
        44: None,
        45: None,
        46: None,
        47: None,
        48: None,
        49: 15,
        50: 14,
        51: 17,
        52: 16
    }
    _port_to_eeprom_mapping = {}
    _sfp_port = range(49, PORT_END + 1)

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

    @property
    def port_end(self):
        return self.PORT_END

    @property
    def qsfp_ports(self):
        return []

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

    def __init__(self):
        # Override port_to_eeprom_mapping for class initialization
        eeprom_path = '/sys/bus/i2c/devices/i2c-{0}/{0}-0050/eeprom'
        for x in range(self.PORT_START, self.PORT_END + 1):
            port_eeprom_path = eeprom_path.format(self.port_to_i2c_mapping[x])
            self.port_to_eeprom_mapping[x] = port_eeprom_path
        SfpUtilBase.__init__(self)


    def get_presence(self, port_num):
        sfp_modabs_path = '/sys/devices/platform/e1031.smc/SFP/sfp_modabs'

        if port_num not in self._sfp_port:
            return False

        status = 1
        try:
            with open(sfp_modabs_path, 'r') as port_status:
                status = int(port_status.read(), 16)
                status = (status >> (port_num - 49)) & 1
        except IOError:
            return False

        return status == 0

    def get_low_power_mode(self, port_num):
        raise NotImplementedError

    def set_low_power_mode(self, port_num, lpmode):
        raise NotImplementedError

    def reset(self, port_num):
        raise NotImplementedError

    def get_transceiver_change_event(self, timeout=0):
        modabs_interrupt_path = '/sys/devices/platform/e1031.smc/SFP/modabs_int'
        ports_evt = {}
        try:
            with open(modabs_interrupt_path, 'r') as port_changes:
                changes = int(port_changes.read(), 16)
                for port_num in self._sfp_port:
                    change = (changes >> ( port_num - 49)) & 1
                    if change == 1:
                        ports_evt[str(port_num)] = str(self.get_presence(port_num))
        except IOError:
            return False, {}
        return True, ports_evt