import logging
from queue import Queue

import numpy as np
import numpy.typing as npt
from scipy.signal import butter, correlate, sosfilt, sosfilt_zi

from ..config import config

logger = logging.getLogger(__name__)
logger.setLevel(logging.DEBUG)

np.seterr(invalid="ignore")


class Preprocessor:
    def __init__(self) -> None:
        self.prev_entries: Queue[npt.NDArray[np.complex128]] = Queue(maxsize=100)
        self.short_term_avg = np.zeros((1,), dtype=np.complex128)
        self.long_term_avg = np.zeros((1,), dtype=np.complex128)
        self.filter = butter(
            5,
            config.preprocessing.bandpass.bounds,
            fs=config.sample_rate,
            btype="band",
            output="sos",
        )

    def preprocess(self, h: npt.NDArray[np.complex128]) -> npt.NDArray[np.complex128]:
        # CSI data is not available for pilot subcarriers.
        h_hat = np.where(
            np.expand_dims(h[:, 0, 0] == 0, axis=(1, 2)),
            correlate(h, [[[1 / 2]], [[0]], [[1 / 2]]], mode="same"),
            h,
        )

        # Skip every other subcarrier
        # h_hat = h_hat[::2, :, :]
        # logger.info(f"CSI shape: {h_hat.shape}")

        h_hat = np.multiply(h_hat, h_hat.conj() / abs(h_hat.conj()))
        h_hat = np.nan_to_num(h_hat)

        # h_hat = correlate(h_hat, np.ones((3, 1, 1)) / 3)
        h_hat = correlate(h_hat, [[[1 / 4]], [[1 / 2]], [[1 / 4]]], mode="valid")

        # Assume that all csi matrices will have the same shape
        if self.long_term_avg.shape != h_hat.shape:
            self.long_term_avg = np.zeros(h_hat.shape, dtype=np.complex128)

        self.long_term_avg = (
            self.long_term_avg * (1 - config.preprocessing.moving_average_alpha)
            + h_hat * config.preprocessing.moving_average_alpha
        )

        # Remove long term average, to remove static paths
        h_hat -= self.long_term_avg

        # Apply bandpass filter to remove low and high frequency noise
        if not hasattr(self, "filter_zi"):
            self.filter_zi = (
                np.expand_dims(sosfilt_zi(self.filter), axis=(-1, -2, -3)) * h_hat
            )

        h_hat_filt, self.filter_zi = sosfilt(
            self.filter, [h_hat], zi=self.filter_zi, axis=0
        )

        return h_hat_filt[0]