import random
from datetime import datetime, timedelta

import pytest

from freqtrade.persistence import PairLocks, Trade
from freqtrade.strategy.interface import SellType
from freqtrade import constants
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.local_stop('XRP/BTC', datetime.utcnow()) == (False, None, None)


@pytest.mark.usefixtures("init_persistence")
def test_stoploss_guard(mocker, default_conf, fee, caplog):
    default_conf['protections'] = [{
        "method": "StoplossGuard",
        "lookback_period": 60,
        "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()


@pytest.mark.usefixtures("init_persistence")
def test_CooldownPeriod(mocker, default_conf, fee, caplog):
    default_conf['protections'] = [{
        "method": "CooldownPeriod",
        "stopduration": 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,
        "stopduration": 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.parametrize("protectionconf,desc_expected,exception_expected", [
    ({"method": "StoplossGuard", "lookback_period": 60, "trade_limit": 2},
     "[{'StoplossGuard': 'StoplossGuard - Frequent Stoploss Guard, "
     "2 stoplosses within 60 minutes.'}]",
     None
     ),
    ({"method": "CooldownPeriod", "stopduration": 60},
     "[{'CooldownPeriod': 'CooldownPeriod - Cooldown period of 60 min.'}]",
     None
     ),
    ({"method": "LowProfitPairs", "stopduration": 60},
     "[{'LowProfitPairs': 'LowProfitPairs - Low Profit Protection, locks pairs with "
     "profit < 0.0 within 60 minutes.'}]",
     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