from .AiInstance import AiInstance
from ..models import AiConfig


class AiService:
    # Singleton
    # def __new__(cls):
    #     if not hasattr(cls, 'instance'):
    #         cls.instance = super(AiService, cls).__new__(cls)
    #     return cls.instance

    def __init__(self):
        self.instances: [AiInstance] = []
        print('Initializing AiService')

    def get_configurations(self) -> [AiConfig]:
        return AiConfig.objects.filter()

    def get_instances(self) -> [AiInstance]:
        self.__ensure_instances_inited__()
        return self.instances

    def get_instance(self, name: str) -> AiInstance:
        return [i for i in self.get_instances() if i.configuration.name == name][0]

    def __ensure_instances_inited__(self):
        for config in self.get_configurations():
            if len([i for i in self.instances if i.configuration.name == config.name]) == 0:
                self.instances.append(AiInstance(config))

    def __del__(self):
        print('Destructing AiService')
        for instance in self.instances:
            del instance