# pragma pylint: disable=missing-docstring, W0212, line-too-long, C0103, unused-argument

from copy import deepcopy
from pathlib import Path
from unittest.mock import MagicMock, PropertyMock

import pytest

from freqtrade.commands.optimize_commands import start_lookahead_analysis
from freqtrade.data.history import get_timerange
from freqtrade.exceptions import OperationalException
from freqtrade.optimize.lookahead_analysis import LookaheadAnalysis
from freqtrade.optimize.lookahead_analysis_helpers import LookaheadAnalysisSubFunctions
from tests.conftest import EXMS, get_args, log_has_re, patch_exchange


@pytest.fixture
def lookahead_conf(default_conf_usdt):
    default_conf_usdt['minimum_trade_amount'] = 10
    default_conf_usdt['targeted_trade_amount'] = 20
    default_conf_usdt['strategy_path'] = str(
        Path(__file__).parent.parent / "strategy/strats/lookahead_bias")
    default_conf_usdt['strategy'] = 'strategy_test_v3_with_lookahead_bias'

    return default_conf_usdt


def test_start_lookahead_analysis(mocker):
    single_mock = MagicMock()
    text_table_mock = MagicMock()
    mocker.patch.multiple(
        'freqtrade.optimize.lookahead_analysis_helpers.LookaheadAnalysisSubFunctions',
        initialize_single_lookahead_analysis=single_mock,
        text_table_lookahead_analysis_instances=text_table_mock,
        )
    args = [
        "lookahead-analysis",
        "--strategy",
        "strategy_test_v3_with_lookahead_bias",
        "--strategy-path",
        str(Path(__file__).parent.parent / "strategy/strats/lookahead_bias"),
    ]
    pargs = get_args(args)
    pargs['config'] = None

    start_lookahead_analysis(pargs)
    assert single_mock.call_count == 1
    assert text_table_mock.call_count == 1

    single_mock.reset_mock()

    # Test invalid config
    args = [
        "lookahead-analysis",
        "--strategy",
        "strategy_test_v3_with_lookahead_bias",
        "--strategy-path",
        str(Path(__file__).parent.parent / "strategy/strats/lookahead_bias"),
        "--targeted-trade-amount",
        "10",
        "--minimum-trade-amount",
        "20",
        ]
    pargs = get_args(args)
    pargs['config'] = None
    with pytest.raises(OperationalException,
                       match=r"targeted trade amount can't be smaller than .*"):
        start_lookahead_analysis(pargs)


def test_lookahead_helper_invalid_config(lookahead_conf, mocker, caplog) -> None:
    conf = deepcopy(lookahead_conf)
    conf['targeted_trade_amount'] = 10
    conf['minimum_trade_amount'] = 40
    with pytest.raises(OperationalException,
                       match=r"targeted trade amount can't be smaller than .*"):
        LookaheadAnalysisSubFunctions.start(conf)

    conf = deepcopy(lookahead_conf)
    del conf['strategy']
    with pytest.raises(OperationalException,
                       match=r"No Strategy specified"):
        LookaheadAnalysisSubFunctions.start(conf)


def test_lookahead_helper_start(lookahead_conf, mocker, caplog) -> None:
    single_mock = MagicMock()
    text_table_mock = MagicMock()
    mocker.patch.multiple(
            'freqtrade.optimize.lookahead_analysis_helpers.LookaheadAnalysisSubFunctions',
            initialize_single_lookahead_analysis=single_mock,
            text_table_lookahead_analysis_instances=text_table_mock,
        )
    LookaheadAnalysisSubFunctions.start(lookahead_conf)
    assert single_mock.call_count == 1
    assert text_table_mock.call_count == 1

    single_mock.reset_mock()
    text_table_mock.reset_mock()


def test_lookahead_helper_text_table_lookahead_analysis_instances():
    # TODO
    pytest.skip("TODO")


def test_lookahead_helper_export_to_csv():
    # TODO
    pytest.skip("TODO")


def test_initialize_single_lookahead_analysis():
    # TODO
    pytest.skip("TODO")


@pytest.mark.parametrize('scenario', [
    'no_bias', 'bias1'
])
def test_biased_strategy(lookahead_conf, mocker, caplog, scenario) -> None:

    mocker.patch('freqtrade.data.history.get_timerange', get_timerange)
    mocker.patch(f'{EXMS}.get_fee', return_value=0.0)
    mocker.patch(f'{EXMS}.get_min_pair_stake_amount', return_value=0.00001)
    mocker.patch(f'{EXMS}.get_max_pair_stake_amount', return_value=float('inf'))
    patch_exchange(mocker)
    mocker.patch('freqtrade.plugins.pairlistmanager.PairListManager.whitelist',
                 PropertyMock(return_value=['UNITTEST/BTC']))
    lookahead_conf['pairs'] = ['UNITTEST/USDT']

    lookahead_conf['timeframe'] = '5m'
    lookahead_conf['timerange'] = '20180119-20180122'

    # Patch scenario Parameter to allow for easy selection
    mocker.patch('freqtrade.strategy.hyper.HyperStrategyMixin.load_params_from_file',
                 return_value={
                     'params': {
                         "buy": {
                                "scenario": scenario
                         }
                     }
                 })

    strategy_obj = {}
    strategy_obj['name'] = "strategy_test_v3_with_lookahead_bias"
    instance = LookaheadAnalysis(lookahead_conf, strategy_obj)
    instance.start()
    # Assert init correct
    assert log_has_re(f"Strategy Parameter: scenario = {scenario}", caplog)
    # Assert bias detected
    assert log_has_re(r".*bias detected.*", caplog)
    # TODO: assert something ... most likely output (?) or instance state?

    # Assert False to see full logs in output
    # assert False
    # Run with `pytest tests/optimize/test_lookahead_analysis.py  -k test_biased_strategy`