try:
    import os
    import sys
    import datetime
    import logging
    import logging.config
    import thrift

    sys.path.append(os.path.dirname(__file__))

    if sys.version_info.major == 3:
        from io import StringIO
    else:
        from cStringIO import StringIO

    from sonic_platform_base.sonic_eeprom import eeprom_base
    from sonic_platform_base.sonic_eeprom import eeprom_tlvinfo

    from sonic_py_common import device_info

    from sonic_platform.platform_thrift_client import thrift_try
    from sonic_platform.platform_utils import file_create

except ImportError as e:
    raise ImportError (str(e) + "- required module not found")

_platform_eeprom_map = {
    "prod_name"         : ("Product Name",                "0x21", 12),
    "odm_pcba_part_num" : ("Part Number",                 "0x22", 13),
    "prod_ser_num"      : ("Serial Number",               "0x23", 12),
    "ext_mac_addr"      : ("Extended MAC Address Base",   "0x24", 12),
    "sys_mfg_date"      : ("System Manufacturing Date",   "0x25",  4),
    "prod_ver"          : ("Product Version",             "0x26",  1),
    "ext_mac_addr_size" : ("Extende MAC Address Size",    "0x2A",  2),
    "sys_mfger"         : ("Manufacturer",                "0x2B",  8)
}

_product_dict = {
    "Montara"   : "Wedge100BF-32X-O-AC-F-BF",
    "Lower MAV" : "Wedge100BF-65X-O-AC-F-BF",
    "Upper MAV" : "Wedge100BF-65X-O-AC-F-BF"
}

_EEPROM_SYMLINK = "/var/run/platform/eeprom/syseeprom"
_EEPROM_STATUS = "/var/run/platform/eeprom/status"

class Eeprom(eeprom_tlvinfo.TlvInfoDecoder):
    def __init__(self):
        file_create(_EEPROM_SYMLINK, '646')
        file_create(_EEPROM_STATUS, '646')
        super(Eeprom, self).__init__(_EEPROM_SYMLINK, 0, _EEPROM_STATUS, True)

        self._eeprom_bin = bytearray()
        self.report_status("initializing..")
        try:
            try:
                if device_info.get_platform() in ["x86_64-accton_as9516_32d-r0",
                                                  "x86_64-accton_as9516bf_32d-r0"]:
                    def tlv_eeprom_get(client):
                        return client.pltfm_mgr.pltfm_mgr_tlv_eeprom_get()
                    try:
                        self._eeprom_bin = bytearray.fromhex(
                            thrift_try(tlv_eeprom_get, 1).raw_content_hex)
                    except thrift.Thrift.TApplicationException as e:
                        raise RuntimeError("api is not supported")
                    except Exception as e:
                        self._eeprom_bin = bytearray.fromhex(
                            thrift_try(tlv_eeprom_get).raw_content_hex)
                else:
                    raise RuntimeError("platform is not supported")

            except RuntimeError as e:
                logging.warning("Tlv eeprom fetching failed: %s, using OpenBMC" % (str(e)))

                def sys_eeprom_get(client):
                    return client.pltfm_mgr.pltfm_mgr_sys_eeprom_get()

                eeprom_params = self.platfrom_eeprom_to_params(thrift_try(sys_eeprom_get))
                stdout_stream = sys.stdout
                sys.stdout = open(os.devnull, 'w')
                self._eeprom_bin = self.set_eeprom(self._eeprom_bin, [eeprom_params])
                sys.stdout.close()
                sys.stdout = stdout_stream
            try:
                self.write_eeprom(self._eeprom_bin)
                self.report_status("ok")
            except IOError as e:
                logging.error("Failed to write eeprom: %s" % (str(e)))

        except Exception as e:
            logging.error("eeprom.py: Initialization failed: %s" % (str(e)))
            raise RuntimeError("eeprom.py: Initialization failed: %s" % (str(e)))

        self._system_eeprom_info = dict()
        visitor = EepromContentVisitor(self._system_eeprom_info)
        self.visit_eeprom(self._eeprom_bin, visitor)

    @staticmethod
    def platfrom_eeprom_to_params(platform_eeprom):
        eeprom_params = ""
        for attr, val in platform_eeprom.__dict__.items():
            if val is None:
                continue

            elem = _platform_eeprom_map.get(attr)
            if elem is None:
                continue

            if isinstance(val, str):
                value = val.replace('\0', '')
            else:
                value = str(val)

            if attr == "sys_mfg_date":
                value = datetime.datetime.strptime(value, '%m-%d-%y').strftime('%m/%d/%Y 00:00:00')

            product = _product_dict.get(value)
            if product is not None:
                value = product
            if len(eeprom_params) > 0:
                eeprom_params += ","
            eeprom_params += "{0:s}={1:s}".format(elem[1], value)
        return eeprom_params

    def get_data(self):
        return self._system_eeprom_info

    def get_raw_data(self):
        return self._eeprom_bin

    def report_status(self, status):
        status_file = None
        try:
            status_file = open(_EEPROM_STATUS, "w")
            status_file.write(status)
        except IOError as e:
            logging.error("Failed to report state: %s" % (str(e)))
        finally:
            if status_file is not None:
                status_file.close()

class EepromContentVisitor(eeprom_tlvinfo.EepromDefaultVisitor):
    def __init__(self, content_dict):
        self.content_dict = content_dict

    def visit_tlv(self, name, code, length, value):
        if code != Eeprom._TLV_CODE_VENDOR_EXT:
            self.content_dict["0x{:X}".format(code)] = value.rstrip('\0')
        else:
            if value:
                value = value.rstrip('\0')
                if value:
                    code = "0x{:X}".format(code)
                    if code not in self.content_dict:
                        self.content_dict[code] = [value]
                    else:
                        self.content_dict[code].append(value)

    def set_error(self, error):
        logging.error("EepromContentVisitor error: %s" % (str(error)))