import random
from datetime import datetime, timedelta

import pytest

from freqtrade import constants
from freqtrade.persistence import PairLocks, Trade
from freqtrade.plugins.protectionmanager import ProtectionManager
from freqtrade.strategy.interface import SellType
from tests.conftest import get_patched_freqtradebot, log_has_re


def generate_mock_trade(pair: str, fee: float, is_open: bool,
                        sell_reason: str = SellType.SELL_SIGNAL,
                        min_ago_open: int = None, min_ago_close: int = None,
                        profit_rate: float = 0.9
                        ):
    open_rate = random.random()

    trade = Trade(
        pair=pair,
        stake_amount=0.01,
        fee_open=fee,
        fee_close=fee,
        open_date=datetime.utcnow() - timedelta(minutes=min_ago_open or 200),
        close_date=datetime.utcnow() - timedelta(minutes=min_ago_close or 30),
        open_rate=open_rate,
        is_open=is_open,
        amount=0.01 / open_rate,
        exchange='bittrex',
    )
    trade.recalc_open_trade_price()
    if not is_open:
        trade.close(open_rate * profit_rate)
        trade.sell_reason = sell_reason

    return trade


def test_protectionmanager(mocker, default_conf):
    default_conf['protections'] = [{'method': protection}
                                   for protection in constants.AVAILABLE_PROTECTIONS]
    freqtrade = get_patched_freqtradebot(mocker, default_conf)

    for handler in freqtrade.protections._protection_handlers:
        assert handler.name in constants.AVAILABLE_PROTECTIONS
        if not handler.has_global_stop:
            assert handler.global_stop(datetime.utcnow()) == (False, None, None)
        if not handler.has_local_stop:
            assert handler.stop_per_pair('XRP/BTC', datetime.utcnow()) == (False, None, None)


@pytest.mark.parametrize('timeframe,expected,protconf', [
    ('1m', [20, 10],
     [{"method": "StoplossGuard", "lookback_period_candles": 20, "stop_duration": 10}]),
    ('5m', [100, 15],
     [{"method": "StoplossGuard", "lookback_period_candles": 20, "stop_duration": 15}]),
    ('1h', [1200, 40],
     [{"method": "StoplossGuard", "lookback_period_candles": 20, "stop_duration": 40}]),
    ('1d', [1440, 5],
     [{"method": "StoplossGuard", "lookback_period_candles": 1, "stop_duration": 5}]),
    ('1m', [20, 5],
     [{"method": "StoplossGuard", "lookback_period": 20, "stop_duration_candles": 5}]),
    ('5m', [15, 25],
     [{"method": "StoplossGuard", "lookback_period": 15, "stop_duration_candles": 5}]),
    ('1h', [50, 600],
     [{"method": "StoplossGuard", "lookback_period": 50, "stop_duration_candles": 10}]),
    ('1h', [60, 540],
     [{"method": "StoplossGuard", "lookback_period_candles": 1, "stop_duration_candles": 9}]),
])
def test_protections_init(mocker, default_conf, timeframe, expected, protconf):
    default_conf['timeframe'] = timeframe
    default_conf['protections'] = protconf
    man = ProtectionManager(default_conf)
    assert len(man._protection_handlers) == len(protconf)
    assert man._protection_handlers[0]._lookback_period == expected[0]
    assert man._protection_handlers[0]._stop_duration == expected[1]


@pytest.mark.usefixtures("init_persistence")
def test_stoploss_guard(mocker, default_conf, fee, caplog):
    default_conf['protections'] = [{
        "method": "StoplossGuard",
        "lookback_period": 60,
        "stop_duration": 40,
        "trade_limit": 2
    }]
    freqtrade = get_patched_freqtradebot(mocker, default_conf)
    message = r"Trading stopped due to .*"
    assert not freqtrade.protections.global_stop()
    assert not log_has_re(message, caplog)
    caplog.clear()

    Trade.session.add(generate_mock_trade(
        'XRP/BTC', fee.return_value, False, sell_reason=SellType.STOP_LOSS.value,
        min_ago_open=200, min_ago_close=30,
        ))

    assert not freqtrade.protections.global_stop()
    assert not log_has_re(message, caplog)
    caplog.clear()
    # This trade does not count, as it's closed too long ago
    Trade.session.add(generate_mock_trade(
        'BCH/BTC', fee.return_value, False, sell_reason=SellType.STOP_LOSS.value,
        min_ago_open=250, min_ago_close=100,
    ))

    Trade.session.add(generate_mock_trade(
        'ETH/BTC', fee.return_value, False, sell_reason=SellType.STOP_LOSS.value,
        min_ago_open=240, min_ago_close=30,
    ))
    # 3 Trades closed - but the 2nd has been closed too long ago.
    assert not freqtrade.protections.global_stop()
    assert not log_has_re(message, caplog)
    caplog.clear()

    Trade.session.add(generate_mock_trade(
        'LTC/BTC', fee.return_value, False, sell_reason=SellType.STOP_LOSS.value,
        min_ago_open=180, min_ago_close=30,
    ))

    assert freqtrade.protections.global_stop()
    assert log_has_re(message, caplog)
    assert PairLocks.is_global_lock()

    # Test 5m after lock-period - this should try and relock the pair, but end-time
    # should be the previous end-time
    end_time = PairLocks.get_pair_longest_lock('*').lock_end_time + timedelta(minutes=5)
    assert freqtrade.protections.global_stop(end_time)
    assert not PairLocks.is_global_lock(end_time)


@pytest.mark.parametrize('only_per_pair', [False, True])
@pytest.mark.usefixtures("init_persistence")
def test_stoploss_guard_perpair(mocker, default_conf, fee, caplog, only_per_pair):
    default_conf['protections'] = [{
        "method": "StoplossGuard",
        "lookback_period": 60,
        "trade_limit": 1,
        "stop_duration": 60,
        "only_per_pair": only_per_pair
    }]
    freqtrade = get_patched_freqtradebot(mocker, default_conf)
    message = r"Trading stopped due to .*"
    pair = 'XRP/BTC'
    assert not freqtrade.protections.stop_per_pair(pair)
    assert not freqtrade.protections.global_stop()
    assert not log_has_re(message, caplog)
    caplog.clear()

    Trade.session.add(generate_mock_trade(
        pair, fee.return_value, False, sell_reason=SellType.STOP_LOSS.value,
        min_ago_open=200, min_ago_close=30, profit_rate=0.9,
        ))

    assert not freqtrade.protections.stop_per_pair(pair)
    assert not freqtrade.protections.global_stop()
    assert not log_has_re(message, caplog)
    caplog.clear()
    # This trade does not count, as it's closed too long ago
    Trade.session.add(generate_mock_trade(
        pair, fee.return_value, False, sell_reason=SellType.STOP_LOSS.value,
        min_ago_open=250, min_ago_close=100, profit_rate=0.9,
    ))
    # Trade does not count for per pair stop as it's the wrong pair.
    Trade.session.add(generate_mock_trade(
        'ETH/BTC', fee.return_value, False, sell_reason=SellType.STOP_LOSS.value,
        min_ago_open=240, min_ago_close=30, profit_rate=0.9,
    ))
    # 3 Trades closed - but the 2nd has been closed too long ago.
    assert not freqtrade.protections.stop_per_pair(pair)
    assert freqtrade.protections.global_stop() != only_per_pair
    if not only_per_pair:
        assert log_has_re(message, caplog)
    else:
        assert not log_has_re(message, caplog)

    caplog.clear()

    # 2nd Trade that counts with correct pair
    Trade.session.add(generate_mock_trade(
        pair, fee.return_value, False, sell_reason=SellType.STOP_LOSS.value,
        min_ago_open=180, min_ago_close=30, profit_rate=0.9,
    ))

    assert freqtrade.protections.stop_per_pair(pair)
    assert freqtrade.protections.global_stop() != only_per_pair
    assert PairLocks.is_pair_locked(pair)
    assert PairLocks.is_global_lock() != only_per_pair


@pytest.mark.usefixtures("init_persistence")
def test_CooldownPeriod(mocker, default_conf, fee, caplog):
    default_conf['protections'] = [{
        "method": "CooldownPeriod",
        "stop_duration": 60,
    }]
    freqtrade = get_patched_freqtradebot(mocker, default_conf)
    message = r"Trading stopped due to .*"
    assert not freqtrade.protections.global_stop()
    assert not freqtrade.protections.stop_per_pair('XRP/BTC')

    assert not log_has_re(message, caplog)
    caplog.clear()

    Trade.session.add(generate_mock_trade(
        'XRP/BTC', fee.return_value, False, sell_reason=SellType.STOP_LOSS.value,
        min_ago_open=200, min_ago_close=30,
    ))

    assert not freqtrade.protections.global_stop()
    assert freqtrade.protections.stop_per_pair('XRP/BTC')
    assert PairLocks.is_pair_locked('XRP/BTC')
    assert not PairLocks.is_global_lock()

    Trade.session.add(generate_mock_trade(
        'ETH/BTC', fee.return_value, False, sell_reason=SellType.ROI.value,
        min_ago_open=205, min_ago_close=35,
    ))

    assert not freqtrade.protections.global_stop()
    assert not PairLocks.is_pair_locked('ETH/BTC')
    assert freqtrade.protections.stop_per_pair('ETH/BTC')
    assert PairLocks.is_pair_locked('ETH/BTC')
    assert not PairLocks.is_global_lock()


@pytest.mark.usefixtures("init_persistence")
def test_LowProfitPairs(mocker, default_conf, fee, caplog):
    default_conf['protections'] = [{
        "method": "LowProfitPairs",
        "lookback_period": 400,
        "stop_duration": 60,
        "trade_limit": 2,
        "required_profit": 0.0,
    }]
    freqtrade = get_patched_freqtradebot(mocker, default_conf)
    message = r"Trading stopped due to .*"
    assert not freqtrade.protections.global_stop()
    assert not freqtrade.protections.stop_per_pair('XRP/BTC')

    assert not log_has_re(message, caplog)
    caplog.clear()

    Trade.session.add(generate_mock_trade(
        'XRP/BTC', fee.return_value, False, sell_reason=SellType.STOP_LOSS.value,
        min_ago_open=800, min_ago_close=450, profit_rate=0.9,
    ))

    # Not locked with 1 trade
    assert not freqtrade.protections.global_stop()
    assert not freqtrade.protections.stop_per_pair('XRP/BTC')
    assert not PairLocks.is_pair_locked('XRP/BTC')
    assert not PairLocks.is_global_lock()

    Trade.session.add(generate_mock_trade(
        'XRP/BTC', fee.return_value, False, sell_reason=SellType.STOP_LOSS.value,
        min_ago_open=200, min_ago_close=120, profit_rate=0.9,
    ))

    # Not locked with 1 trade (first trade is outside of lookback_period)
    assert not freqtrade.protections.global_stop()
    assert not freqtrade.protections.stop_per_pair('XRP/BTC')
    assert not PairLocks.is_pair_locked('XRP/BTC')
    assert not PairLocks.is_global_lock()

    # Add positive trade
    Trade.session.add(generate_mock_trade(
        'XRP/BTC', fee.return_value, False, sell_reason=SellType.ROI.value,
        min_ago_open=20, min_ago_close=10, profit_rate=1.15,
    ))
    assert not freqtrade.protections.stop_per_pair('XRP/BTC')
    assert not PairLocks.is_pair_locked('XRP/BTC')

    Trade.session.add(generate_mock_trade(
        'XRP/BTC', fee.return_value, False, sell_reason=SellType.STOP_LOSS.value,
        min_ago_open=110, min_ago_close=20, profit_rate=0.8,
    ))

    # Locks due to 2nd trade
    assert not freqtrade.protections.global_stop()
    assert freqtrade.protections.stop_per_pair('XRP/BTC')
    assert PairLocks.is_pair_locked('XRP/BTC')
    assert not PairLocks.is_global_lock()


@pytest.mark.usefixtures("init_persistence")
def test_MaxDrawdown(mocker, default_conf, fee, caplog):
    default_conf['protections'] = [{
        "method": "MaxDrawdown",
        "lookback_period": 1000,
        "stop_duration": 60,
        "trade_limit": 3,
        "max_allowed_drawdown": 0.15
    }]
    freqtrade = get_patched_freqtradebot(mocker, default_conf)
    message = r"Trading stopped due to Max.*"

    assert not freqtrade.protections.global_stop()
    assert not freqtrade.protections.stop_per_pair('XRP/BTC')
    caplog.clear()

    Trade.session.add(generate_mock_trade(
        'XRP/BTC', fee.return_value, False, sell_reason=SellType.STOP_LOSS.value,
        min_ago_open=1000, min_ago_close=900, profit_rate=1.1,
    ))
    Trade.session.add(generate_mock_trade(
        'XRP/BTC', fee.return_value, False, sell_reason=SellType.STOP_LOSS.value,
        min_ago_open=500, min_ago_close=400, profit_rate=0.9,
    ))
    # Not locked with one trade
    assert not freqtrade.protections.global_stop()
    assert not freqtrade.protections.stop_per_pair('XRP/BTC')
    assert not PairLocks.is_pair_locked('XRP/BTC')
    assert not PairLocks.is_global_lock()

    Trade.session.add(generate_mock_trade(
        'XRP/BTC', fee.return_value, False, sell_reason=SellType.STOP_LOSS.value,
        min_ago_open=1200, min_ago_close=1100, profit_rate=0.5,
    ))

    # Not locked with 1 trade (2nd trade is outside of lookback_period)
    assert not freqtrade.protections.global_stop()
    assert not freqtrade.protections.stop_per_pair('XRP/BTC')
    assert not PairLocks.is_pair_locked('XRP/BTC')
    assert not PairLocks.is_global_lock()
    assert not log_has_re(message, caplog)

    # Winning trade ... (should not lock, does not change drawdown!)
    Trade.session.add(generate_mock_trade(
        'XRP/BTC', fee.return_value, False, sell_reason=SellType.ROI.value,
        min_ago_open=320, min_ago_close=410, profit_rate=1.5,
    ))
    assert not freqtrade.protections.global_stop()
    assert not PairLocks.is_global_lock()

    caplog.clear()

    # Add additional negative trade, causing a loss of > 15%
    Trade.session.add(generate_mock_trade(
        'XRP/BTC', fee.return_value, False, sell_reason=SellType.ROI.value,
        min_ago_open=20, min_ago_close=10, profit_rate=0.8,
    ))
    assert not freqtrade.protections.stop_per_pair('XRP/BTC')
    # local lock not supported
    assert not PairLocks.is_pair_locked('XRP/BTC')
    assert freqtrade.protections.global_stop()
    assert PairLocks.is_global_lock()
    assert log_has_re(message, caplog)


@pytest.mark.parametrize("protectionconf,desc_expected,exception_expected", [
    ({"method": "StoplossGuard", "lookback_period": 60, "trade_limit": 2, "stop_duration": 60},
     "[{'StoplossGuard': 'StoplossGuard - Frequent Stoploss Guard, "
     "2 stoplosses within 60 minutes.'}]",
     None
     ),
    ({"method": "CooldownPeriod", "stop_duration": 60},
     "[{'CooldownPeriod': 'CooldownPeriod - Cooldown period of 60 minutes.'}]",
     None
     ),
    ({"method": "LowProfitPairs", "lookback_period": 60, "stop_duration": 60},
     "[{'LowProfitPairs': 'LowProfitPairs - Low Profit Protection, locks pairs with "
     "profit < 0.0 within 60 minutes.'}]",
     None
     ),
    ({"method": "MaxDrawdown", "lookback_period": 60, "stop_duration": 60},
     "[{'MaxDrawdown': 'MaxDrawdown - Max drawdown protection, stop trading if drawdown is > 0.0 "
     "within 60 minutes.'}]",
     None
     ),
    ({"method": "StoplossGuard", "lookback_period_candles": 12, "trade_limit": 2,
      "stop_duration": 60},
     "[{'StoplossGuard': 'StoplossGuard - Frequent Stoploss Guard, "
     "2 stoplosses within 12 candles.'}]",
     None
     ),
    ({"method": "CooldownPeriod", "stop_duration_candles": 5},
     "[{'CooldownPeriod': 'CooldownPeriod - Cooldown period of 5 candles.'}]",
     None
     ),
    ({"method": "LowProfitPairs", "lookback_period_candles": 11, "stop_duration": 60},
     "[{'LowProfitPairs': 'LowProfitPairs - Low Profit Protection, locks pairs with "
     "profit < 0.0 within 11 candles.'}]",
     None
     ),
    ({"method": "MaxDrawdown", "lookback_period_candles": 20, "stop_duration": 60},
     "[{'MaxDrawdown': 'MaxDrawdown - Max drawdown protection, stop trading if drawdown is > 0.0 "
     "within 20 candles.'}]",
     None
     ),
])
def test_protection_manager_desc(mocker, default_conf, protectionconf,
                                 desc_expected, exception_expected):

    default_conf['protections'] = [protectionconf]
    freqtrade = get_patched_freqtradebot(mocker, default_conf)

    short_desc = str(freqtrade.protections.short_desc())
    assert short_desc == desc_expected