from configparser import ConfigParser
from pathlib import Path
import platform


class Config:
    _instance = None

    def __new__(cls):
        if cls._instance is None:
            cls._instance = super().__new__(cls)
            config = ConfigParser()
            config_path = Path("config.ini")
            config.read(config_path)
            cls._instance.config = config
        return cls._instance

    def get_mssql_url(self) -> str:
        mssql = self.config["mssql"]
        driver = "ODBC Driver 18 for SQL Server" if platform.platform.system() == "Linux" else "SQL Server"
        driver = driver.replace(" ", "+")
        return f"mssql+pyodbc://{mssql['user']}:{mssql['password']}@{mssql['host']}/{mssql['name']}?driver={driver}"

    def get_postgres_url(self) -> str:
        db = self.config["postgres"]
        return f"postgresql://{db['user']}:{db['password']}@{db['host']}/{db['name']}"

    def get_seq_url(self) -> str:
        seq = self.config["seq"]
        return seq["url"]

    def get_seq_api_key(self) -> str:
        seq = self.config["seq"]
        return seq["api_key"]