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#
#  Licensed under the GNU Lesser General Public License Version 3.0 (the "License");
#  You may not use this file except in compliance with the License.
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from nautilus_trader.indicators.average.ma_factory import MovingAverageFactory
from nautilus_trader.indicators.average.ma_factory import MovingAverageType

from nautilus_trader.core.correctness cimport Condition
from nautilus_trader.indicators.base.indicator cimport Indicator
from nautilus_trader.model.data cimport Bar


cdef class Bias(Indicator):
    """
    Rate of change between the source and a moving average.

    Parameters
    ----------
    period : int
        The rolling window period for the indicator (> 0).
    ma_type : MovingAverageType
        The moving average type for the indicator (cannot be None).
    """

    def __init__(
        self,
        int period,
        ma_type not None: MovingAverageType=MovingAverageType.SIMPLE,
    ):
        Condition.positive_int(period, "period")
        params = [
            period,
            ma_type.name,
        ]
        super().__init__(params=params)

        self.period = period
        self._ma = MovingAverageFactory.create(period, ma_type)
        self.value = 0

    cpdef void handle_bar(self, Bar bar):
        """
        Update the indicator with the given bar.

        Parameters
        ----------
        bar : Bar
            The update bar.

        """
        Condition.not_none(bar, "bar")

        self.update_raw(
            bar.close.as_double(),
        )

    cpdef void update_raw(self, double close):
        """
        Update the indicator with the given raw values.

        Parameters
        ----------
        close : double
            The close price.

        """
        # Calculate average
        self._ma.update_raw(close)
        self.value = (close / self._ma.value) - 1.0
        self._check_initialized()

    cdef void _check_initialized(self):
        if not self.initialized:
            self._set_has_inputs(True)
            if self._ma.initialized:
                self._set_initialized(True)

    cpdef void _reset(self):
        self._ma.reset()
        self.value = 0
