from yaml import load

from onapsdk.configuration import settings
from onapsdk.sdc.service import Service
from onapsdk.sdc.vf import Vf
from onapsdk.sdc.vl import Vl

from ..base import BaseStep, YamlTemplateBaseStep
from .vf import VfOnboardStep, YamlTemplateVfOnboardStep


class ServiceOnboardStep(BaseStep):
    """Service onboard step."""

    def __init__(self, cleanup=False):
        """Initialize step.

        Substeps:
            - VfOnboardStep.
        """
        super().__init__(cleanup=cleanup)
        self.add_step(VfOnboardStep(cleanup=cleanup))

    @property
    def description(self) -> str:
        """Step description."""
        return "Onboard service in SDC."

    @property
    def component(self) -> str:
        """Component name."""
        return "SDC"

    @BaseStep.store_state
    def execute(self):
        """Onboard service.

        Use settings values:
         - VL_NAME,
         - VF_NAME,
         - SERVICE_NAME.

        """
        super().execute()
        service: Service = Service(name=settings.SERVICE_NAME)
        service.create()
        if settings.VL_NAME != "":
            vl: Vl = Vl(name=settings.VL_NAME)
            service.add_resource(vl)
        if settings.VF_NAME != "":
            vf: Vf = Vf(name=settings.VF_NAME)
            service.add_resource(vf)
        service.checkin()
        service.onboard()


class YamlTemplateServiceOnboardStep(YamlTemplateBaseStep):
    """Service onboard using YAML template step."""

    def __init__(self, cleanup=False):
        """Initialize step.

        Substeps:
            - YamlTemplateVfOnboardStep.
        """
        super().__init__(cleanup=cleanup)
        self._yaml_template: dict = None
        self.add_step(YamlTemplateVfOnboardStep(cleanup=cleanup))

    @property
    def description(self) -> str:
        """Step description."""
        return "Onboard service described in YAML file in SDC."

    @property
    def component(self) -> str:
        """Component name."""
        return "SDC"

    @property
    def yaml_template(self) -> dict:
        """Step YAML template.

        Load from file if it's a root step, get from parent otherwise.

        Returns:
            dict: Step YAML template

        """
        if self.is_root:
            if not self._yaml_template:
                with open(settings.SERVICE_YAML_TEMPLATE, "r") as yaml_template:
                    self._yaml_template: dict = load(yaml_template)
            return self._yaml_template
        return self.parent.yaml_template

    @property
    def service_name(self) -> str:
        """Service name.

        Get from YAML template if it's a root step, get from parent otherwise.

        Returns:
            str: Service name

        """
        if self.is_root:
            return next(iter(self.yaml_template.keys()))
        else:
            return self.parent.service_name

    @YamlTemplateBaseStep.store_state
    def execute(self):
        """Onboard service."""
        super().execute()
        service: Service = Service(name=settings.SERVICE_NAME)
        service.create()
        if "networks" in self.yaml_template[self.service_name]:
            for net in self.yaml_template[self.service_name]["networks"]:
                vl: Vl = Vl(name=net['vl_name'])
                service.add_resource(vl)
        if "vnfs" in self.yaml_template[self.service_name]:
            for vnf in self.yaml_template[self.service_name]["vnfs"]:
                vf: Vf = Vf(name=vnf["vnf_name"])
                service.add_resource(vf)
        service.checkin()
        service.onboard()