try:
    import os
    import subprocess
    from sonic_platform_base.component_base import ComponentBase
    from platform_thrift_client import thrift_try
    import json
    from collections import OrderedDict
    from sonic_py_common import device_info
    from platform_utils import limit_execution_time

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

def get_bios_version():
    """
    Retrieves the firmware version of the BIOS
    Returns:
    A string containing the firmware version of the BIOS
    """
    try:
        cmd = ['dmidecode', '-s', 'bios-version']
        if os.geteuid() != 0:
            cmd.insert(0, 'sudo')
        return subprocess.check_output(cmd).strip().decode()
    except subprocess.CalledProcessError as e:
        raise RuntimeError("Failed to get BIOS version")

@limit_execution_time(1)
def get_bmc_version():
    """
    Retrieves the firmware version of the BMC
    Returns:
    A string containing the firmware version of the BMC
    """
    ver = "N/A"
    def bmc_get(client):
        return client.pltfm_mgr.pltfm_mgr_chss_mgmt_bmc_ver_get()
    try:    
        ver = thrift_try(bmc_get)
    except Exception:
        pass

    return ver

class BFPlatformComponentsParser(object):
    """
    BFPlatformComponentsParser
    """
    CHASSIS_KEY = "chassis"
    MODULE_KEY = "module"
    COMPONENT_KEY = "component"
    FIRMWARE_KEY = "firmware"

    def __init__(self, platform_components_path):
        self.__chassis_component_map = OrderedDict()
        self.__component_list = []
        self.__bf_model = ""
        self.__parse_platform_components(platform_components_path)

    def __is_str(self, obj):
        return isinstance(obj, str)

    def __is_dict(self, obj):
        return isinstance(obj, dict)

    def __parser_fail(self, msg):
        raise RuntimeError("Failed to parse \"{}\": {}".format(PLATFORM_COMPONENTS_FILE, msg))

    def __parser_platform_fail(self, msg):
        self.__parser_fail("invalid platform schema: {}".format(msg))

    def __parser_chassis_fail(self, msg):
        self.__parser_fail("invalid chassis schema: {}".format(msg))

    def __parser_component_fail(self, msg):
        self.__parser_fail("invalid component schema: {}".format(msg))

    def __parse_component_section(self, section, component, is_module_component=False):
        if not self.__is_dict(component):
            self.__parser_component_fail("dictionary is expected: key={}".format(self.COMPONENT_KEY))

        if not component:
            return

        missing_key = None

        for key1, value1 in component.items():
            if not self.__is_dict(value1):
                self.__parser_component_fail("dictionary is expected: key={}".format(key1))

            self.__chassis_component_map[section][key1] = OrderedDict()

            if value1:
                if len(value1) < 1 or len(value1) > 3:
                    self.__parser_component_fail("unexpected number of records: key={}".format(key1))

                if self.FIRMWARE_KEY not in value1:
                    missing_key = self.FIRMWARE_KEY
                    break

                for key2, value2 in value1.items():
                    if not self.__is_str(value2):
                        self.__parser_component_fail("string is expected: key={}".format(key2))
                
                self.__chassis_component_map[section][key1] = value1

        if missing_key is not None:
            self.__parser_component_fail("\"{}\" key hasn't been found".format(missing_key))

    def __parse_chassis_section(self, chassis):
        self.__chassis_component_map = OrderedDict()

        if not self.__is_dict(chassis):
            self.__parser_chassis_fail("dictionary is expected: key={}".format(self.CHASSIS_KEY))

        if not chassis:
            self.__parser_chassis_fail("dictionary is empty: key={}".format(self.CHASSIS_KEY))

        if len(chassis) != 1:
            self.__parser_chassis_fail("unexpected number of records: key={}".format(self.CHASSIS_KEY))

        for key, value in chassis.items():
            if not self.__is_dict(value):
                self.__parser_chassis_fail("dictionary is expected: key={}".format(key))

            if not value:
                self.__parser_chassis_fail("dictionary is empty: key={}".format(key))

            if self.COMPONENT_KEY not in value:
                self.__parser_chassis_fail("\"{}\" key hasn't been found".format(self.COMPONENT_KEY))

            if len(value) != 1:
                self.__parser_chassis_fail("unexpected number of records: key={}".format(key))

            self.__chassis_component_map[key] = OrderedDict()
            self.__parse_component_section(key, value[self.COMPONENT_KEY])

    def get_components_list(self):
        self.__component_list = []
        for key, value in self.__chassis_component_map[self.__bf_model].items():
            self.__component_list.append(key)
        
        return self.__component_list

    def get_chassis_component_map(self):
        return self.__chassis_component_map

    def __parse_platform_components(self,  platform_components_path):
        with open(platform_components_path) as platform_components:
            data = json.load(platform_components)
            kkey, val  = list(data[self.CHASSIS_KEY].items())[0]
            self.__bf_model = kkey
            
            if not self.__is_dict(data):
                self.__parser_platform_fail("dictionary is expected: key=root")

            if not data:
                self.__parser_platform_fail("dictionary is empty: key=root")

            if self.CHASSIS_KEY not in data:
                self.__parser_platform_fail("\"{}\" key hasn't been found".format(self.CHASSIS_KEY))

            if len(data) != 1:
                self.__parser_platform_fail("unexpected number of records: key=root")

            self.__parse_chassis_section(data[self.CHASSIS_KEY])

    chassis_component_map = property(fget=get_chassis_component_map)

class Components(ComponentBase):
    """BFN Montara Platform-specific Component class"""
    bf_platform = device_info.get_path_to_platform_dir()
    bf_platform_json =  "{}/platform_components.json".format(bf_platform.strip())
    bpcp = BFPlatformComponentsParser(bf_platform_json)

    def __init__(self, component_index=0):
        try:
            self.index = component_index
            self.name = "N/A"
            self.version = "N/A"
            self.description = "N/A"
            self.name = self.bpcp.get_components_list()[self.index]            
        except IndexError as e:
            print("Error: No components found in plaform_components.json")

        if (self.name == "BMC"):
            self.description = "Chassis BMC"
        elif (self.name == "BIOS"):
            self.description = "Chassis BIOS"

    def get_name(self):
        """
        Retrieves the name of the component
        Returns:
        A string containing the name of the component
        """
        if not self.name:
            return "N/A"
        return self.name

    def get_description(self):
        """
        Retrieves the description of the component
        Returns:
        A string containing the description of the component
        """
        return self.description

    def get_firmware_version(self):
        """
        Retrieves the firmware version of the component
        Returns:
            A string containing the firmware version of the component
        """
        if self.version == "N/A":
            if (self.name == "BMC"):
                self.version = get_bmc_version()
            elif (self.name == "BIOS"):
                self.version = get_bios_version()

        return self.version

    def install_firmware(self, image_path):
        """
        Installs firmware to the component
        Args:
        image_path: A string, path to firmware image
        Returns:
        A boolean, True if install was successful, False if not
        """
        return False

    def get_presence(self):
        """
        Retrieves the presence of the component
        Returns:
            bool: True if component is present, False if not
        """
        return True

    def get_model(self):
        """
        Retrieves the model number (or part number) of the component
        Returns:
            string: Model/part number of component
        """
        return 'N/A'

    def get_serial(self):
        """
        Retrieves the serial number of the component
        Returns:
            string: Serial number of component
        """
        return 'N/A'

    def get_status(self):
        """
        Retrieves the operational status of the component
        Returns:
            A boolean value, True if component is operating properly, False if not
        """
        return True

    def get_position_in_parent(self):
        """
        Retrieves 1-based relative physical position in parent device.
        If the agent cannot determine the parent-relative position
        for some reason, or if the associated value of
        entPhysicalContainedIn is'0', then the value '-1' is returned
        Returns:
            integer: The 1-based relative physical position in parent device
            or -1 if cannot determine the position
        """
        return -1

    def is_replaceable(self):
        """
        Indicate whether this component is replaceable.
        Returns:
            bool: True if it is replaceable.
        """
        return False
    
    def get_available_firmware_version(self, image_path):
        return 'None'

    def get_firmware_update_notification(self, image_path):
        """
        Retrieves a notification on what should be done in order to complete
        the component firmware update

        Args:
            image_path: A string, path to firmware image

        Returns:
            A string containing the component firmware update notification if required.
            By default 'None' value will be used, which indicates that no actions are required
        """
        return 'None'

    def update_firmware(self, image_path):
        """
        Updates firmware of the component

        This API performs firmware update: it assumes firmware installation and loading in a single call.
        In case platform component requires some extra steps (apart from calling Low Level Utility)
        to load the installed firmware (e.g, reboot, power cycle, etc.) - this will be done automatically by API

        Args:
            image_path: A string, path to firmware image

        Raises:
            RuntimeError: update failed
        """
        return False

    def auto_update_firmware(self, image_path, boot_action):
        """
        Default handling of attempted automatic update for a component
        Will skip the installation if the boot_action is 'warm' or 'fast' and will call update_firmware()
        if boot_action is fast.
        """
        return 1