"""
This file contains functionality related to data.
"""
import os.path

import seisbench.data as sbd
import logging

logging.root.setLevel(logging.INFO)
logger = logging.getLogger('data')


def get_dataset_by_name(name):
    """
    Resolve dataset name to class from seisbench.data.

    :param name: Name of dataset as defined in seisbench.data.
    :return: Dataset class from seisbench.data
    """
    try:
        return sbd.__getattribute__(name)
    except AttributeError:
        raise ValueError(f"Unknown dataset '{name}'.")


def get_custom_dataset(path):
    """
    Return custom dataset in seisbench format
    :param path:
    :return: Dataset class
    """

    try:
        return sbd.WaveformDataset(path)
    except AttributeError:
        raise ValueError(f"Unknown dataset '{path}'.")


def validate_custom_dataset(data_path):
    """
    Validate the dataset
    :param data_path: path to the dataset
    :return:
    """
    # check if path exists
    if not os.path.isdir((data_path)):
        raise ValueError(f"Data path {data_path} does not exist.")

    dataset = sbd.WaveformDataset(data_path)
    # check if the dataset is split into train, dev and test
    if len(dataset.train()) == 0:
        raise ValueError(f"Training set is empty.")
    if len(dataset.dev()) == 0:
        raise ValueError(f"Dev set is empty.")
    if len(dataset.test()) == 0:
        raise ValueError(f"Test set is empty.")

    logger.info("Custom dataset validated successfully.")