from datetime import datetime, timedelta, timezone
from pathlib import Path
from unittest.mock import MagicMock

import pytest
from pandas import DataFrame, DateOffset, Timestamp, to_datetime

from freqtrade.configuration import TimeRange
from freqtrade.constants import LAST_BT_RESULT_FN
from freqtrade.data.btanalysis import (
    BT_DATA_COLUMNS,
    analyze_trade_parallelism,
    extract_trades_of_period,
    get_latest_backtest_filename,
    get_latest_hyperopt_file,
    load_backtest_data,
    load_backtest_metadata,
    load_trades,
    load_trades_from_db,
)
from freqtrade.data.history import load_data, load_pair_history
from freqtrade.data.metrics import (
    calculate_cagr,
    calculate_calmar,
    calculate_csum,
    calculate_expectancy,
    calculate_market_change,
    calculate_max_drawdown,
    calculate_sharpe,
    calculate_sortino,
    calculate_underwater,
    combine_dataframes_with_mean,
    combined_dataframes_with_rel_mean,
    create_cum_profit,
)
from freqtrade.exceptions import OperationalException
from freqtrade.util import dt_utc
from tests.conftest import CURRENT_TEST_STRATEGY, create_mock_trades
from tests.conftest_trades import MOCK_TRADE_COUNT


def test_get_latest_backtest_filename(testdatadir, mocker):
    with pytest.raises(ValueError, match=r"Directory .* does not exist\."):
        get_latest_backtest_filename(testdatadir / "does_not_exist")

    with pytest.raises(ValueError, match=r"Directory .* does not seem to contain .*"):
        get_latest_backtest_filename(testdatadir)

    testdir_bt = testdatadir / "backtest_results"
    res = get_latest_backtest_filename(testdir_bt)
    assert res == "backtest-result.json"

    res = get_latest_backtest_filename(str(testdir_bt))
    assert res == "backtest-result.json"

    mocker.patch("freqtrade.data.btanalysis.json_load", return_value={})

    with pytest.raises(ValueError, match=r"Invalid '.last_result.json' format."):
        get_latest_backtest_filename(testdir_bt)


def test_get_latest_hyperopt_file(testdatadir):
    res = get_latest_hyperopt_file(testdatadir / "does_not_exist", "testfile.pickle")
    assert res == testdatadir / "does_not_exist/testfile.pickle"

    res = get_latest_hyperopt_file(testdatadir.parent)
    assert res == testdatadir.parent / "hyperopt_results.pickle"

    res = get_latest_hyperopt_file(str(testdatadir.parent))
    assert res == testdatadir.parent / "hyperopt_results.pickle"

    # Test with absolute path
    with pytest.raises(
        OperationalException,
        match="--hyperopt-filename expects only the filename, not an absolute path.",
    ):
        get_latest_hyperopt_file(str(testdatadir.parent), str(testdatadir.parent))


def test_load_backtest_metadata(mocker, testdatadir):
    res = load_backtest_metadata(testdatadir / "nonexistent.file.json")
    assert res == {}

    mocker.patch("freqtrade.data.btanalysis.get_backtest_metadata_filename")
    mocker.patch("freqtrade.data.btanalysis.json_load", side_effect=Exception())
    with pytest.raises(
        OperationalException, match=r"Unexpected error.*loading backtest metadata\."
    ):
        load_backtest_metadata(testdatadir / "nonexistent.file.json")


def test_load_backtest_data_old_format(testdatadir, mocker):
    filename = testdatadir / "backtest-result_test222.json"
    mocker.patch("freqtrade.data.btanalysis.load_backtest_stats", return_value=[])

    with pytest.raises(
        OperationalException,
        match=r"Backtest-results with only trades data are no longer supported.",
    ):
        load_backtest_data(filename)


def test_load_backtest_data_new_format(testdatadir):
    filename = testdatadir / "backtest_results/backtest-result.json"
    bt_data = load_backtest_data(filename)
    assert isinstance(bt_data, DataFrame)
    assert set(bt_data.columns) == set(BT_DATA_COLUMNS)
    assert len(bt_data) == 179

    # Test loading from string (must yield same result)
    bt_data2 = load_backtest_data(str(filename))
    assert bt_data.equals(bt_data2)

    # Test loading from folder (must yield same result)
    bt_data3 = load_backtest_data(testdatadir / "backtest_results")
    assert bt_data.equals(bt_data3)

    with pytest.raises(ValueError, match=r"File .* does not exist\."):
        load_backtest_data("filename" + "nofile")

    with pytest.raises(ValueError, match=r"Unknown dataformat."):
        load_backtest_data(testdatadir / "backtest_results" / LAST_BT_RESULT_FN)


def test_load_backtest_data_multi(testdatadir):
    filename = testdatadir / "backtest_results/backtest-result_multistrat.json"
    for strategy in ("StrategyTestV2", "TestStrategy"):
        bt_data = load_backtest_data(filename, strategy=strategy)
        assert isinstance(bt_data, DataFrame)
        assert set(bt_data.columns) == set(BT_DATA_COLUMNS)
        assert len(bt_data) == 179

        # Test loading from string (must yield same result)
        bt_data2 = load_backtest_data(str(filename), strategy=strategy)
        assert bt_data.equals(bt_data2)

    with pytest.raises(ValueError, match=r"Strategy XYZ not available in the backtest result\."):
        load_backtest_data(filename, strategy="XYZ")

    with pytest.raises(ValueError, match=r"Detected backtest result with more than one strategy.*"):
        load_backtest_data(filename)


@pytest.mark.usefixtures("init_persistence")
@pytest.mark.parametrize("is_short", [False, True])
def test_load_trades_from_db(default_conf, fee, is_short, mocker):
    create_mock_trades(fee, is_short)
    # remove init so it does not init again
    init_mock = mocker.patch("freqtrade.data.btanalysis.init_db", MagicMock())

    trades = load_trades_from_db(db_url=default_conf["db_url"])
    assert init_mock.call_count == 1
    assert len(trades) == MOCK_TRADE_COUNT
    assert isinstance(trades, DataFrame)
    assert "pair" in trades.columns
    assert "open_date" in trades.columns
    assert "profit_ratio" in trades.columns

    for col in BT_DATA_COLUMNS:
        if col not in ["index", "open_at_end"]:
            assert col in trades.columns
    trades = load_trades_from_db(db_url=default_conf["db_url"], strategy=CURRENT_TEST_STRATEGY)
    assert len(trades) == 4
    trades = load_trades_from_db(db_url=default_conf["db_url"], strategy="NoneStrategy")
    assert len(trades) == 0


def test_extract_trades_of_period(testdatadir):
    pair = "UNITTEST/BTC"
    # 2018-11-14 06:07:00
    timerange = TimeRange("date", None, 1510639620, 0)

    data = load_pair_history(pair=pair, timeframe="1m", datadir=testdatadir, timerange=timerange)

    trades = DataFrame(
        {
            "pair": [pair, pair, pair, pair],
            "profit_ratio": [0.0, 0.1, -0.2, -0.5],
            "profit_abs": [0.0, 1, -2, -5],
            "open_date": to_datetime(
                [
                    datetime(2017, 11, 13, 15, 40, 0, tzinfo=timezone.utc),
                    datetime(2017, 11, 14, 9, 41, 0, tzinfo=timezone.utc),
                    datetime(2017, 11, 14, 14, 20, 0, tzinfo=timezone.utc),
                    datetime(2017, 11, 15, 3, 40, 0, tzinfo=timezone.utc),
                ],
                utc=True,
            ),
            "close_date": to_datetime(
                [
                    datetime(2017, 11, 13, 16, 40, 0, tzinfo=timezone.utc),
                    datetime(2017, 11, 14, 10, 41, 0, tzinfo=timezone.utc),
                    datetime(2017, 11, 14, 15, 25, 0, tzinfo=timezone.utc),
                    datetime(2017, 11, 15, 3, 55, 0, tzinfo=timezone.utc),
                ],
                utc=True,
            ),
        }
    )
    trades1 = extract_trades_of_period(data, trades)
    # First and last trade are dropped as they are out of range
    assert len(trades1) == 2
    assert trades1.iloc[0].open_date == datetime(2017, 11, 14, 9, 41, 0, tzinfo=timezone.utc)
    assert trades1.iloc[0].close_date == datetime(2017, 11, 14, 10, 41, 0, tzinfo=timezone.utc)
    assert trades1.iloc[-1].open_date == datetime(2017, 11, 14, 14, 20, 0, tzinfo=timezone.utc)
    assert trades1.iloc[-1].close_date == datetime(2017, 11, 14, 15, 25, 0, tzinfo=timezone.utc)


def test_analyze_trade_parallelism(testdatadir):
    filename = testdatadir / "backtest_results/backtest-result.json"
    bt_data = load_backtest_data(filename)

    res = analyze_trade_parallelism(bt_data, "5m")
    assert isinstance(res, DataFrame)
    assert "open_trades" in res.columns
    assert res["open_trades"].max() == 3
    assert res["open_trades"].min() == 0


def test_load_trades(default_conf, mocker):
    db_mock = mocker.patch("freqtrade.data.btanalysis.load_trades_from_db", MagicMock())
    bt_mock = mocker.patch("freqtrade.data.btanalysis.load_backtest_data", MagicMock())

    load_trades(
        "DB",
        db_url=default_conf.get("db_url"),
        exportfilename=default_conf.get("exportfilename"),
        no_trades=False,
        strategy=CURRENT_TEST_STRATEGY,
    )

    assert db_mock.call_count == 1
    assert bt_mock.call_count == 0

    db_mock.reset_mock()
    bt_mock.reset_mock()
    default_conf["exportfilename"] = Path("testfile.json")
    load_trades(
        "file",
        db_url=default_conf.get("db_url"),
        exportfilename=default_conf.get("exportfilename"),
    )

    assert db_mock.call_count == 0
    assert bt_mock.call_count == 1

    db_mock.reset_mock()
    bt_mock.reset_mock()
    default_conf["exportfilename"] = "testfile.json"
    load_trades(
        "file",
        db_url=default_conf.get("db_url"),
        exportfilename=default_conf.get("exportfilename"),
        no_trades=True,
    )

    assert db_mock.call_count == 0
    assert bt_mock.call_count == 0


def test_calculate_market_change(testdatadir):
    pairs = ["ETH/BTC", "ADA/BTC"]
    data = load_data(datadir=testdatadir, pairs=pairs, timeframe="5m")
    result = calculate_market_change(data)
    assert isinstance(result, float)
    assert pytest.approx(result) == 0.01100002


def test_combine_dataframes_with_mean(testdatadir):
    pairs = ["ETH/BTC", "ADA/BTC"]
    data = load_data(datadir=testdatadir, pairs=pairs, timeframe="5m")
    df = combine_dataframes_with_mean(data)
    assert isinstance(df, DataFrame)
    assert "ETH/BTC" in df.columns
    assert "ADA/BTC" in df.columns
    assert "mean" in df.columns


def test_combined_dataframes_with_rel_mean(testdatadir):
    pairs = ["ETH/BTC", "ADA/BTC"]
    data = load_data(datadir=testdatadir, pairs=pairs, timeframe="5m")
    df = combined_dataframes_with_rel_mean(
        data, datetime(2018, 1, 12, tzinfo=timezone.utc), datetime(2018, 1, 28, tzinfo=timezone.utc)
    )
    assert isinstance(df, DataFrame)
    assert "ETH/BTC" not in df.columns
    assert "ADA/BTC" not in df.columns
    assert "mean" in df.columns
    assert "rel_mean" in df.columns
    assert "count" in df.columns
    assert df.iloc[0]["count"] == 2
    assert df.iloc[-1]["count"] == 2
    assert len(df) < len(data["ETH/BTC"])


def test_combine_dataframes_with_mean_no_data(testdatadir):
    pairs = ["ETH/BTC", "ADA/BTC"]
    data = load_data(datadir=testdatadir, pairs=pairs, timeframe="6m")
    with pytest.raises(ValueError, match=r"No data provided\."):
        combine_dataframes_with_mean(data)


def test_create_cum_profit(testdatadir):
    filename = testdatadir / "backtest_results/backtest-result.json"
    bt_data = load_backtest_data(filename)
    timerange = TimeRange.parse_timerange("20180110-20180112")

    df = load_pair_history(pair="TRX/BTC", timeframe="5m", datadir=testdatadir, timerange=timerange)

    cum_profits = create_cum_profit(
        df.set_index("date"), bt_data[bt_data["pair"] == "TRX/BTC"], "cum_profits", timeframe="5m"
    )
    assert "cum_profits" in cum_profits.columns
    assert cum_profits.iloc[0]["cum_profits"] == 0
    assert pytest.approx(cum_profits.iloc[-1]["cum_profits"]) == 9.0225563e-05


def test_create_cum_profit1(testdatadir):
    filename = testdatadir / "backtest_results/backtest-result.json"
    bt_data = load_backtest_data(filename)
    # Move close-time to "off" the candle, to make sure the logic still works
    bt_data["close_date"] = bt_data.loc[:, "close_date"] + DateOffset(seconds=20)
    timerange = TimeRange.parse_timerange("20180110-20180112")

    df = load_pair_history(pair="TRX/BTC", timeframe="5m", datadir=testdatadir, timerange=timerange)

    cum_profits = create_cum_profit(
        df.set_index("date"), bt_data[bt_data["pair"] == "TRX/BTC"], "cum_profits", timeframe="5m"
    )
    assert "cum_profits" in cum_profits.columns
    assert cum_profits.iloc[0]["cum_profits"] == 0
    assert pytest.approx(cum_profits.iloc[-1]["cum_profits"]) == 9.0225563e-05

    with pytest.raises(ValueError, match="Trade dataframe empty."):
        create_cum_profit(
            df.set_index("date"),
            bt_data[bt_data["pair"] == "NOTAPAIR"],
            "cum_profits",
            timeframe="5m",
        )


def test_calculate_max_drawdown(testdatadir):
    filename = testdatadir / "backtest_results/backtest-result.json"
    bt_data = load_backtest_data(filename)
    drawdown = calculate_max_drawdown(bt_data, value_col="profit_abs")
    assert isinstance(drawdown.relative_account_drawdown, float)
    assert pytest.approx(drawdown.relative_account_drawdown) == 0.29753914
    assert isinstance(drawdown.high_date, Timestamp)
    assert isinstance(drawdown.low_date, Timestamp)
    assert isinstance(drawdown.high_value, float)
    assert isinstance(drawdown.low_value, float)
    assert drawdown.high_date == Timestamp("2018-01-16 19:30:00", tz="UTC")
    assert drawdown.low_date == Timestamp("2018-01-16 22:25:00", tz="UTC")

    underwater = calculate_underwater(bt_data)
    assert isinstance(underwater, DataFrame)

    with pytest.raises(ValueError, match="Trade dataframe empty."):
        calculate_max_drawdown(DataFrame())

    with pytest.raises(ValueError, match="Trade dataframe empty."):
        calculate_underwater(DataFrame())


def test_calculate_csum(testdatadir):
    filename = testdatadir / "backtest_results/backtest-result.json"
    bt_data = load_backtest_data(filename)
    csum_min, csum_max = calculate_csum(bt_data)

    assert isinstance(csum_min, float)
    assert isinstance(csum_max, float)
    assert csum_min < csum_max
    assert csum_min < 0.0001
    assert csum_max > 0.0002
    csum_min1, csum_max1 = calculate_csum(bt_data, 5)

    assert csum_min1 == csum_min + 5
    assert csum_max1 == csum_max + 5

    with pytest.raises(ValueError, match="Trade dataframe empty."):
        csum_min, csum_max = calculate_csum(DataFrame())


def test_calculate_expectancy(testdatadir):
    filename = testdatadir / "backtest_results/backtest-result.json"
    bt_data = load_backtest_data(filename)

    expectancy, expectancy_ratio = calculate_expectancy(DataFrame())
    assert expectancy == 0.0
    assert expectancy_ratio == 100

    expectancy, expectancy_ratio = calculate_expectancy(bt_data)
    assert isinstance(expectancy, float)
    assert isinstance(expectancy_ratio, float)
    assert pytest.approx(expectancy) == 5.820687070932315e-06
    assert pytest.approx(expectancy_ratio) == 0.07151374226574791

    data = {"profit_abs": [100, 200, 50, -150, 300, -100, 80, -30]}
    df = DataFrame(data)
    expectancy, expectancy_ratio = calculate_expectancy(df)

    assert pytest.approx(expectancy) == 56.25
    assert pytest.approx(expectancy_ratio) == 0.60267857


def test_calculate_sortino(testdatadir):
    filename = testdatadir / "backtest_results/backtest-result.json"
    bt_data = load_backtest_data(filename)

    sortino = calculate_sortino(DataFrame(), None, None, 0)
    assert sortino == 0.0

    sortino = calculate_sortino(
        bt_data,
        bt_data["open_date"].min(),
        bt_data["close_date"].max(),
        0.01,
    )
    assert isinstance(sortino, float)
    assert pytest.approx(sortino) == 35.17722


def test_calculate_sharpe(testdatadir):
    filename = testdatadir / "backtest_results/backtest-result.json"
    bt_data = load_backtest_data(filename)

    sharpe = calculate_sharpe(DataFrame(), None, None, 0)
    assert sharpe == 0.0

    sharpe = calculate_sharpe(
        bt_data,
        bt_data["open_date"].min(),
        bt_data["close_date"].max(),
        0.01,
    )
    assert isinstance(sharpe, float)
    assert pytest.approx(sharpe) == 44.5078669


def test_calculate_calmar(testdatadir):
    filename = testdatadir / "backtest_results/backtest-result.json"
    bt_data = load_backtest_data(filename)

    calmar = calculate_calmar(DataFrame(), None, None, 0)
    assert calmar == 0.0

    calmar = calculate_calmar(
        bt_data,
        bt_data["open_date"].min(),
        bt_data["close_date"].max(),
        0.01,
    )
    assert isinstance(calmar, float)
    assert pytest.approx(calmar) == 559.040508


@pytest.mark.parametrize(
    "start,end,days, expected",
    [
        (64900, 176000, 3 * 365, 0.3945),
        (64900, 176000, 365, 1.7119),
        (1000, 1000, 365, 0.0),
        (1000, 1500, 365, 0.5),
        (1000, 1500, 100, 3.3927),  # sub year
        (0.01000000, 0.01762792, 120, 4.6087),  # sub year BTC values
    ],
)
def test_calculate_cagr(start, end, days, expected):
    assert round(calculate_cagr(days, start, end), 4) == expected


def test_calculate_max_drawdown2():
    values = [
        0.011580,
        0.010048,
        0.011340,
        0.012161,
        0.010416,
        0.010009,
        0.020024,
        -0.024662,
        -0.022350,
        0.020496,
        -0.029859,
        -0.030511,
        0.010041,
        0.010872,
        -0.025782,
        0.010400,
        0.012374,
        0.012467,
        0.114741,
        0.010303,
        0.010088,
        -0.033961,
        0.010680,
        0.010886,
        -0.029274,
        0.011178,
        0.010693,
        0.010711,
    ]

    dates = [dt_utc(2020, 1, 1) + timedelta(days=i) for i in range(len(values))]
    df = DataFrame(zip(values, dates, strict=False), columns=["profit", "open_date"])
    # sort by profit and reset index
    df = df.sort_values("profit").reset_index(drop=True)
    df1 = df.copy()
    drawdown = calculate_max_drawdown(
        df, date_col="open_date", starting_balance=0.2, value_col="profit"
    )
    # Ensure df has not been altered.
    assert df.equals(df1)

    assert isinstance(drawdown.drawdown_abs, float)
    assert isinstance(drawdown.relative_account_drawdown, float)
    # High must be before low
    assert drawdown.high_date < drawdown.low_date
    # High value must be higher than low value
    assert drawdown.high_value > drawdown.low_value
    assert drawdown.drawdown_abs == 0.091755
    assert pytest.approx(drawdown.relative_account_drawdown) == 0.32129575

    df = DataFrame(zip(values[:5], dates[:5], strict=False), columns=["profit", "open_date"])
    with pytest.raises(ValueError, match="No losing trade, therefore no drawdown."):
        calculate_max_drawdown(df, date_col="open_date", value_col="profit")

    df1 = DataFrame(zip(values[:5], dates[:5], strict=False), columns=["profit", "open_date"])
    df1.loc[:, "profit"] = df1["profit"] * -1
    # No winning trade ...
    drawdown = calculate_max_drawdown(df1, date_col="open_date", value_col="profit")
    assert drawdown.drawdown_abs == 0.043965


@pytest.mark.parametrize(
    "profits,relative,highd,lowdays,result,result_rel",
    [
        ([0.0, -500.0, 500.0, 10000.0, -1000.0], False, 3, 4, 1000.0, 0.090909),
        ([0.0, -500.0, 500.0, 10000.0, -1000.0], True, 0, 1, 500.0, 0.5),
    ],
)
def test_calculate_max_drawdown_abs(profits, relative, highd, lowdays, result, result_rel):
    """
    Test case from issue https://github.com/freqtrade/freqtrade/issues/6655
    [1000, 500,  1000, 11000, 10000] # absolute results
    [1000, 50%,  0%,   0%,       ~9%]   # Relative drawdowns
    """
    init_date = datetime(2020, 1, 1, tzinfo=timezone.utc)
    dates = [init_date + timedelta(days=i) for i in range(len(profits))]
    df = DataFrame(zip(profits, dates, strict=False), columns=["profit_abs", "open_date"])
    # sort by profit and reset index
    df = df.sort_values("profit_abs").reset_index(drop=True)
    df1 = df.copy()
    drawdown = calculate_max_drawdown(
        df, date_col="open_date", starting_balance=1000, relative=relative
    )
    # Ensure df has not been altered.
    assert df.equals(df1)

    assert isinstance(drawdown.drawdown_abs, float)
    assert isinstance(drawdown.relative_account_drawdown, float)
    assert drawdown.high_date == init_date + timedelta(days=highd)
    assert drawdown.low_date == init_date + timedelta(days=lowdays)

    # High must be before low
    assert drawdown.high_date < drawdown.low_date
    # High value must be higher than low value
    assert drawdown.high_value > drawdown.low_value
    assert drawdown.drawdown_abs == result
    assert pytest.approx(drawdown.relative_account_drawdown) == result_rel