import pandas as pd

import xarray as xr

from . import randn, requires_dask

try:
    import dask  # noqa: F401
except ImportError:
    pass


def make_bench_data(shape, frac_nan, chunks):
    vals = randn(shape, frac_nan)
    coords = {"time": pd.date_range("2000-01-01", freq="D", periods=shape[0])}
    da = xr.DataArray(vals, dims=("time", "x", "y"), coords=coords)

    if chunks is not None:
        da = da.chunk(chunks)

    return da


def time_interpolate_na(shape, chunks, method, limit):
    if chunks is not None:
        requires_dask()
    da = make_bench_data(shape, 0.1, chunks=chunks)
    actual = da.interpolate_na(dim="time", method="linear", limit=limit)

    if chunks is not None:
        actual = actual.compute()


time_interpolate_na.param_names = ["shape", "chunks", "method", "limit"]
time_interpolate_na.params = (
    [(3650, 200, 400), (100, 25, 25)],
    [None, {"x": 25, "y": 25}],
    ["linear", "spline", "quadratic", "cubic"],
    [None, 3],
)


def time_ffill(shape, chunks, limit):

    da = make_bench_data(shape, 0.1, chunks=chunks)
    actual = da.ffill(dim="time", limit=limit)

    if chunks is not None:
        actual = actual.compute()


time_ffill.param_names = ["shape", "chunks", "limit"]
time_ffill.params = (
    [(3650, 200, 400), (100, 25, 25)],
    [None, {"x": 25, "y": 25}],
    [None, 3],
)


def time_bfill(shape, chunks, limit):

    da = make_bench_data(shape, 0.1, chunks=chunks)
    actual = da.bfill(dim="time", limit=limit)

    if chunks is not None:
        actual = actual.compute()


time_bfill.param_names = ["shape", "chunks", "limit"]
time_bfill.params = (
    [(3650, 200, 400), (100, 25, 25)],
    [None, {"x": 25, "y": 25}],
    [None, 3],
)