import os, sys, importlib, inspect, glob, re

from ffx.configuration_controller import ConfigurationController
from ffx.database import databaseContext

from sqlalchemy import Engine
from sqlalchemy.orm import sessionmaker


class Conversion():

    def __init__(self):

        self._context = {}
        self._context['config'] = ConfigurationController()

        self._context['database'] = databaseContext(databasePath=self._context['config'].getDatabaseFilePath())

        self.__databaseSession: sessionmaker = self._context['database']['session']
        self.__databaseEngine: Engine = self._context['database']['engine']


    @staticmethod    
    def list():

        basePath = os.path.dirname(__file__)

        filenamePattern = re.compile("conversion_([0-9]+)_([0-9]+)\\.py")

        filenameList = [os.path.basename(fp) for fp in glob.glob(f"{ basePath }/*.py") if fp != __file__]

        versionTupleList = [(fm.group(1), fm.group(2)) for fn in filenameList if (fm := filenamePattern.search(fn))]

        return versionTupleList


    @staticmethod
    def getClassReference(versionFrom, versionTo):
        importlib.import_module(f"ffx.model.conversions.conversion_{ versionFrom }_{ versionTo }")
        for name, obj in inspect.getmembers(sys.modules[f"ffx.model.conversions.conversion_{ versionFrom }_{ versionTo }"]):
            #HINT: Excluding DispositionCombination as it seems to be included by import (?)
            if inspect.isclass(obj) and name != 'Conversion' and name.startswith('Conversion'):
                return obj

    @staticmethod
    def getAllClassReferences():
        return [Conversion.getClassReference(verFrom, verTo) for verFrom, verTo in Conversion.list()]