import numpy as np
import pandas as pd
import pyerrors as pe
import pytest

def test_df_export_import(tmp_path):
    my_dict = {"int": 1,
           "float": -0.01,
           "Obs1": pe.pseudo_Obs(87, 21, "test_ensemble"),
           "Obs2": pe.pseudo_Obs(-87, 21, "test_ensemble2")}
    for gz in [True, False]:
        my_df = pd.DataFrame([my_dict] * 10)

        pe.input.pandas.dump_df(my_df, (tmp_path / 'df_output').as_posix(), gz=gz)
        reconstructed_df = pe.input.pandas.load_df((tmp_path / 'df_output').as_posix(), auto_gamma=True, gz=gz)
        assert np.all(my_df == reconstructed_df)

        pe.input.pandas.load_df((tmp_path / 'df_output.csv').as_posix(), gz=gz)


def test_df_Corr(tmp_path):

    my_corr = pe.Corr([pe.pseudo_Obs(-0.48, 0.04, "test"), pe.pseudo_Obs(-0.154, 0.03, "test")])

    my_dict = {"int": 1,
           "float": -0.01,
           "Corr": my_corr}
    my_df = pd.DataFrame([my_dict] * 5)

    pe.input.pandas.dump_df(my_df, (tmp_path / 'df_output').as_posix())
    reconstructed_df = pe.input.pandas.load_df((tmp_path / 'df_output').as_posix(), auto_gamma=True)


def test_default_export_pe_import(tmp_path):
    df = pd.DataFrame([{"Column1": 1.1, "Column2": 2, "Column3": "my string£"}])
    df.to_csv((tmp_path / 'plain_df.csv').as_posix(), index=False)
    re_df = pe.input.pandas.load_df((tmp_path / 'plain_df').as_posix(), gz=False)
    assert np.all(df == re_df)


def test_pe_export_default_import(tmp_path):
    df = pd.DataFrame([{"Column1": 1.1, "Column2": 2, "Column3": "my string£"}])
    pe.input.pandas.dump_df(df, (tmp_path / 'pe_df').as_posix(), gz=False)
    re_df = pd.read_csv((tmp_path / 'pe_df.csv').as_posix())
    assert np.all(df == re_df)


def test_gz_serialization():
    my_obs = pe.pseudo_Obs(0.1, 0.01, "pandas DataFrame ensemble only for test purposes.")
    my_df = pd.DataFrame([{"Label": 1, "Obs": my_obs}])
    for gz in [False, True]:
        ser = pe.input.pandas._serialize_df(my_df, gz=gz)
        deser = pe.input.pandas._deserialize_df(ser)
        assert np.all(my_df == deser)


def test_sql(tmp_path):
    my_list = [{"Label": i, "Obs": pe.pseudo_Obs(5 * np.exp(-0.2 * i), 0.01, "test_ensemble", 20)} for i in range(15)]
    pe_df = pd.DataFrame(my_list)
    my_db = (tmp_path / "test_db.sqlite").as_posix()
    pe.input.pandas.to_sql(pe_df, "My_table", my_db)
    for auto_gamma in [False, True]:
        re_df = pe.input.pandas.read_sql("SELECT * from My_table", my_db, auto_gamma=auto_gamma)
        assert np.all(re_df == pe_df)


def test_sql_if_exists_fail(tmp_path):
    pe_df = pd.DataFrame([{"Label": 1, "Obs": pe.pseudo_Obs(5 * np.exp(-0.2), 0.01, "test_ensemble", 20)}])
    my_db = (tmp_path / "test_db.sqlite").as_posix()
    pe.input.pandas.to_sql(pe_df, "My_table", my_db)
    with pytest.raises(ValueError):
        pe.input.pandas.to_sql(pe_df, "My_table", my_db)
    pe.input.pandas.to_sql(pe_df, "My_table", my_db, if_exists='append')
    pe.input.pandas.to_sql(pe_df, "My_table", my_db, if_exists='replace')