class Database():
    def __init__(self):
        pass

    def close(self):
        pass

    def query(self, query: str, parameters: list=None) -> tuple[int, list[tuple]]:
        pass

    def select(self, table: str, columns: list[str]=None, where: list[dict]=None) -> list[tuple]:
        query_string = "SELECT {columns} FROM {table}{where}".format(
            columns = "*" if columns is None else ",".join(columns),
            table = table,
            where = self.__generate_basic_where_clause(where) if not where is None else ""
        )

        return self.query(query_string, [element["value"] for element in where] if not where is None else None)[1]

    def insert(self, table: str, columns: list[str], values: list) -> int:
        query_string = "INSERT INTO {table} ({columns}) VALUES ({values})".format(
            table = table,
            columns = ",".join(columns),
            values = ("?," * len(values))[:-1]
        )

        return self.query(query_string, values)[0]
    
    def update(self, table: str, columns: list[str], values: list, where: list[dict]=None) -> int:
        query_string = "UPDATE {table} SET {set_rules}{where}".format(
            table = table,
            set_rules = ",".join([element + "=?" for element in columns]),
            where = self.__generate_basic_where_clause(where) if not where is None else ""
        )

        return self.query(query_string, values)[0]
    
    def delete(self, table: str, values: list, where: list[dict]=None) -> int:
        query_string = "DELETE FROM {table}{where}".format(
            table = table,
            where = self.__generate_basic_where_clause(where) if not where is None else ""
        )

        return self.query(query_string, values)[0]
        
    def __generate_basic_where_clause(self, where: list[dict]):
        return " WHERE {clauses}".format(
            clauses = "".join([
                element["name"] + " " + element["compare"] + " ?" + (" " + element["boolean_op"] + " " if "boolean_op" in element else "")
                for element in where
            ])
        )