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from pathlib import Path

import pandas as pd
from pmlb import classification_dataset_names, fetch_data, regression_dataset_names
from pmlb.write_metadata import imbalance_metrics

from benchmark.benchmark_model_types import BenchmarkModelTypesEnum
from benchmark.benchmark_utils import \
    (convert_json_stats_to_csv, get_models_hyperparameters,
     get_penn_case_data_paths, save_metrics_result_file)
from benchmark.executor import CaseExecutor, ExecutionParams
from core.repository.tasks import TaskTypesEnum, Task
from core.models.data import InputData
from core.models.model import Model
from sklearn.metrics import mean_squared_error as mse, roc_auc_score as roc_auc, r2_score
from datetime import timedelta


def _problem_and_metric_for_dataset(name_of_dataset: str, num_classes: int):
    if num_classes == 2 and name_of_dataset in classification_dataset_names:
        return TaskTypesEnum.classification, ['roc_auc', 'f1']
    elif name_of_dataset in regression_dataset_names:
        return TaskTypesEnum.regression, ['mse', 'r2']
    else:
        return None, None


def is_dataset_big(name_of_dataset):
    dataset = fetch_data(name_of_dataset)
    if len(dataset.index) > 10000 and dataset.size > 200000:
        return True


def pmlb_dataset(name_of_dataset, task):
    train_file_path, test_file_path = get_penn_case_data_paths(name_of_dataset)
    train_data = InputData.from_csv(train_file_path, task=Task(task))
    test_data = InputData.from_csv(test_file_path, task=Task(task))

    return train_data, test_data


if __name__ == '__main__':
    penn_data = Path('./datasets.csv')
    dataset = []
    if penn_data.is_file():
        df = pd.read_csv(penn_data)
        dataset = df['dataset_names'].values
    else:
        print('Please create nonempty csv-file with datasets')

    # if len(dataset) == 0:
    #     dataset = [data for data in regression_dataset_names if is_dataset_big(data)]

    for name_of_dataset in dataset:
        pmlb_data = fetch_data(name_of_dataset)
        num_classes, _ = imbalance_metrics(pmlb_data['target'].tolist())
        problem_class, metric_names = _problem_and_metric_for_dataset(name_of_dataset, num_classes)
        if not problem_class or not metric_names:
            print(f'Incorrect dataset: {name_of_dataset}')
            continue

        # train_file, test_file = get_penn_case_data_paths(name_of_dataset)
        train_data, test_data = pmlb_dataset(name_of_dataset, problem_class)
        # config_models_data = get_models_hyperparameters()
        case_name = f'penn_ml_{name_of_dataset}'
        dct = {}

        try:
            xgb = Model(model_type='xgbreg')
            model, _ = xgb.fit(data=train_data)
            test_predicted = xgb.predict(fitted_model=model, data=test_data)

            mse_on_test = r2_score(y_true=test_data.target,
                                   y_pred=test_predicted)

            dct['before'] = mse_on_test
            xgb_for_tune = Model(model_type='xgbreg')
            model, _ = xgb_for_tune.fine_tune(data=train_data, iterations=10,
                                              max_lead_time=timedelta(minutes=1))

            test_predicted_tuned = xgb_for_tune.predict(fitted_model=model, data=test_data)

            mse_on_test_tuned = r2_score(y_true=test_data.target,
                                         y_pred=test_predicted_tuned)
            dct['after'] = mse_on_test_tuned

        except Exception as ex:
            print(f'Exception on {name_of_dataset}: {ex}')
            continue

        # result_metrics['hyperparameters'] = config_models_data

        # save_metrics_result_file(result_metrics, file_name=f'penn_ml_metrics_for_{name_of_dataset}')
        save_metrics_result_file(dct, file_name=f'penn_ml_metrics_for_{name_of_dataset}')

    # convert_json_stats_to_csv(dataset)

# if __name__ == '__main__':
#     penn_data = Path('./datasets.csv')
#     dataset = []
#     if penn_data.is_file():
#         df = pd.read_csv(penn_data)
#         dataset = df['dataset_names'].values
#     else:
#         print('Please create nonempty csv-file with datasets')
#
#     if len(dataset) == 0:
#         dataset = classification_dataset_names + regression_dataset_names
#
#     for name_of_dataset in dataset:
#         pmlb_data = fetch_data(name_of_dataset)
#         num_classes, _ = imbalance_metrics(pmlb_data['target'].tolist())
#         problem_class, metric_names = _problem_and_metric_for_dataset(name_of_dataset, num_classes)
#         if not problem_class or not metric_names:
#             print(f'Incorrect dataset: {name_of_dataset}')
#             continue
#
#         train_file, test_file = get_penn_case_data_paths(name_of_dataset)
#         config_models_data = get_models_hyperparameters()
#         case_name = f'penn_ml_{name_of_dataset}'
#
#         try:
#             result_metrics = CaseExecutor(params=ExecutionParams(train_file=train_file,
#                                                                  test_file=test_file,
#                                                                  task=problem_class,
#                                                                  target_name='target',
#                                                                  case_label=case_name),
#                                           # models=[BenchmarkModelTypesEnum.tpot,
#                                           #         BenchmarkModelTypesEnum.baseline,
#                                           #         BenchmarkModelTypesEnum.fedot],
#                                           models=[BenchmarkModelTypesEnum.fedot],
#                                           metric_list=metric_names).execute()
#         except Exception as ex:
#             print(f'Exception on {name_of_dataset}: {ex}')
#             continue
#
#         result_metrics['hyperparameters'] = config_models_data
#
#         save_metrics_result_file(result_metrics, file_name=f'penn_ml_metrics_for_{name_of_dataset}')
#
#     convert_json_stats_to_csv(dataset)

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