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

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


i2c_set = 'i2cset'
i2c_get = 'i2cget'
cpld_addr = '0x33'
mux_reg = '0x4A'

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

    PORT_START = 0
    PORT_END = 63
    QSFP_PORT_START = 48
    PORTS_IN_BLOCK = 64

    _port_to_eeprom_mapping = {}
    port_to_i2c_mapping = {
           0: [2,1],
           1: [2,2],
           2: [2,3],
           3: [2,4],
           4: [2,5],
           5: [2,6],
           6: [2,7],
           7: [2,8],
           8: [2,9],
           9: [2,10],
           10: [2,11],
           11: [2,12],
           12: [2,13],
           13: [2,14],
           14: [2,15],
           15: [2,16],
           16: [2,17],
           17: [2,18],
           18: [2,19],
           19: [2,20],
           20: [2,21],
           21: [2,22],
           22: [2,23],
           23: [2,24],
           24: [3,25],
           25: [3,26],
           26: [3,27],
           27: [3,28],
           28: [3,29],
           29: [3,30],
           30: [3,31],
           31: [3,32],
           32: [3,33],
           33: [3,34],
           34: [3,35],
           35: [3,36],
           36: [3,37],
           37: [3,38],
           38: [3,39],
           39: [3,40],
           40: [3,41],
           41: [3,42],
           42: [3,43],
           43: [3,44],
           44: [3,45],
           45: [3,46],
           46: [3,47],
           47: [3,48],
           48: [4,49],
           49: [4,50],
           50: [4,51],
           51: [4,52],
           52: [4,53],
           53: [4,54],
           54: [4,55],
           55: [4,56],
           56: [4,57],
           57: [4,58],
           58: [4,59],
           59: [4,60],
           60: [4,61],
           61: [4,62],
           62: [4,63],
           63: [4,64]
    }

    @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.QSFP_PORT_START, self.PORTS_IN_BLOCK + 1)

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

    @property
    def qsfp_port_start(self):
        return self.QSFP_PORT_START

    def __init__(self):

        sfp_eeprom_path = '/sys/bus/i2c/devices/{0[0]}-0050/sfp{0[1]}'
        qsfp_eeprom_path = '/sys/bus/i2c/devices/{0[0]}-0050/qsfp{0[1]}'
        for x in range(self.port_start, self.qsfp_port_start):
            port_eeprom_path = sfp_eeprom_path.format(self.port_to_i2c_mapping[x])
            self.port_to_eeprom_mapping[x] = port_eeprom_path
        for x in range(self.qsfp_port_start, self.port_end + 1):
            port_eeprom_path = qsfp_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):
        # Check for invalid port_num
        if port_num < self.port_start or port_num > self.port_end:
            return False

        try:
            reg_file = open("/sys/devices/platform/ingrasys-s8900-64xc-cpld.0/qsfp_modprs")
        except IOError as e:
            print "Error: unable to open file: %s" % str(e)
            return False

        content = reg_file.readline().rstrip()

        # content is a string containing the hex representation of the register
        reg_value = int(content, 16)

        # Mask off the bit corresponding to our port
        mask = (1 << port_num)

        # content is a string, either "0" or "1"
        if reg_value & mask == 0:
            return True

        return False

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

        try:
            reg_file = open("/sys/devices/platform/ingrasys-s8900-64xc-cpld.0/qsfp_lpmode")
        except IOError as e:
            print "Error: unable to open file: %s" % str(e)
            return False

        content = reg_file.readline().rstrip()

        # content is a string containing the hex representation of the register
        reg_value = int(content, 16)

        # Mask off the bit corresponding to our port
        mask = (1 << (port_num - self.qsfp_port_start) )

        # LPMode is active high
        if reg_value & mask == 0:
            return False

        return True

    def set_low_power_mode(self, port_num, lpmode):
        # Check for invalid port_num
        if port_num < self.qsfp_port_start or port_num > self.port_end:
            return False

        try:
            reg_file = open("/sys/devices/platform/ingrasys-s8900-64xc-cpld.0/qsfp_lpmode", "r+")
        except IOError as e:
            print "Error: unable to open file: %s" % str(e)
            return False

        content = reg_file.readline().rstrip()

        # content is a string containing the hex representation of the register
        reg_value = int(content, 16)

        # Mask off the bit corresponding to our port
        mask = (1 << (port_num - self.qsfp_port_start) )

        # LPMode is active high; set or clear the bit accordingly
        if lpmode is True:
            reg_value = reg_value | mask
        else:
            reg_value = reg_value & ~mask

        # Convert our register value back to a hex string and write back
        content = hex(reg_value)

        reg_file.seek(0)
        reg_file.write(content)
        reg_file.close()

        return True

    def reset(self, port_num):
        QSFP_RESET_REGISTER_DEVICE_FILE = "/sys/devices/platform/ingrasys-s8900-64xc-cpld.0/qsfp_reset"

        # Check for invalid port_num
        if port_num < self.qsfp_port_start or port_num > self.port_end:
            return False

        try:
            reg_file = open(QSFP_RESET_REGISTER_DEVICE_FILE, "r+")
        except IOError as e:
            print "Error: unable to open file: %s" % str(e)
            return False

        content = reg_file.readline().rstrip()

        # File content is a string containing the hex representation of the register
        reg_value = int(content, 16)

        # Mask off the bit corresponding to our port
        mask = (1 << (port_num - self.qsfp_port_start))

        # ResetL is active low
        reg_value = reg_value & ~mask

        # Convert our register value back to a hex string and write back
        reg_file.seek(0)
        reg_file.write(hex(reg_value))
        reg_file.close()

        # Sleep 1 second to allow it to settle
        time.sleep(1)

        # Flip the bit back high and write back to the register to take port out of reset
        try:
            reg_file = open(QSFP_RESET_REGISTER_DEVICE_FILE, "w")
        except IOError as e:
            print "Error: unable to open file: %s" % str(e)
            return False

        reg_value = reg_value | mask
        reg_file.seek(0)
        reg_file.write(hex(reg_value))
        reg_file.close()

        return True

    def get_transceiver_change_event(self):
        """
        TODO: This function need to be implemented
        when decide to support monitoring SFP(Xcvrd)
        on this platform.
        """
        raise NotImplementedError