#!/usr/bin/python
# -*- coding: utf-8 -*-
# ---------------------------------------------------------------------------------------------------------
# Author : Ulrich Carmesin
# Source : gitea.ucarmesin.de
# ---------------------------------------------------------------------------------------------------------
import os
import basic.program
import basic.constants as B
import utils.path_const as P

EXP_KEY_MISSING = "key is missing {}"
EXP_KEY_DOESNT_EXIST = "key doesnt exist in domain {}"

class Catalog:
    __instance = None
    """
    in this class there should be managed each defined key-value-pairs
    the pairs ara loaded from the path testdata/catalog:
    * initially the csv-file catalog.csv
    * on demand other csv-files in the path
    """
    def __init__(self):
        self.catalog = {}
        Catalog.__instance = self
        pass

    @staticmethod
    def getInstance():
        if Catalog.__instance == None:
            return Catalog()
        return Catalog.__instance

    def getValue(self, domain, key):
        """
        this function gets the value of the domain an key

        :param domain:
        :param key:
        :return:
        """
        job = basic.program.Job.getInstance()
        if not (isinstance(domain, str) and len(domain)):
            raise Exception(EXP_KEY_MISSING, (domain, key))
        if not (isinstance(key, str) and len(key)):
            raise Exception(EXP_KEY_MISSING, (domain, key))

        if domain not in self.catalog:
            self.readDomain(domain)
        if key not in self.catalog[domain][key]:
            raise Exception(EXP_KEY_DOESNT_EXIST, (domain, key))
        return self.catalog[domain][key]

    def readDomain(self, domain):
        """

        :param domain:
        :return:
        """
        job = basic.program.Job.getInstance()
        if not (isinstance(domain, str) and len(domain)):
            raise Exception(EXP_KEY_MISSING, (domain))