import requests;
import json;
import logging;

class PyExecPlugins(type):
    def __init__(cls, name, bases, attrs):
        if not hasattr(cls, "plugins"):
            logging.getLogger("pyexec").debug("Initializing plugins")
            cls.plugins = {}
            cls.alias = {}
        else:
            logging.getLogger("pyexec").debug("Appending a plugin %s - %s ", cls.name, cls)
            cls.plugins[cls.name] = cls
            #Alias plugin also with taskdefinition so it will be lookup-able with poth Operation name and taskdefinition
            if cls.taskdef is not None:
                cls.alias[cls.taskdef["name"]] = cls

    def getPlugins(cls):
        return cls.plugins 
    
    def getPluginNames(cls):
        return [*cls.plugins.keys()] 
    
    def get(cls, name):
        return cls.plugins.get(name)
    
    def getAlias(cls, name):
        return cls.alias.get(name)
    
    def registerTaskDefinitions(cls, server, auth):
        url = server.rstrip("/") + "/metadata/taskdefs"
        #pyexec generic taskdefinition
        taskdefs = []
        for plg in cls.getPluginNames():
            if cls.plugins[plg].taskdef is not None: 
                taskdef = cls.plugins[plg].taskdef
                taskdefs.append(taskdef)

        #Post all new (or not) task definitions to orchestrator
        logging.getLogger("pyexec").debug("Recording task definitions %s", taskdefs)
        headers = {'Content-Type': 'application/json'}
        if auth != None:
            headers['Authorization'] = 'Basic ' + auth
        try:
            response = requests.request("POST", url, headers=headers, data=json.dumps(taskdefs), timeout=(5, 10))
        except Exception as e:
            logging.getLogger("pyexec").warning("Unable to register task defs %s", e)

class PyExecPlugin(object, metaclass=PyExecPlugins):
    def __init__(self, data=None, config=None):
        self.data = data
        self.config = config

    def hasDefinition(self):
        return (self.taskdef is not None)

    def isAutomatic(self):
        return False