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use crate::prelude::*;
use crate::series::unstable::UnstableSeries;

/// Transform to physical type and coerce floating point and similar sized integer to a bit representation
/// to reduce compiler bloat
pub fn _to_physical_and_bit_repr(s: &[Series]) -> Vec<Series> {
    s.iter()
        .map(|s| {
            let physical = s.to_physical_repr();
            match physical.dtype() {
                DataType::Int64 => physical.bit_repr_large().into_series(),
                DataType::Int32 => physical.bit_repr_small().into_series(),
                DataType::Float32 => physical.bit_repr_small().into_series(),
                DataType::Float64 => physical.bit_repr_large().into_series(),
                _ => physical.into_owned(),
            }
        })
        .collect()
}

/// A utility that allocates an `UnstableSeries`. The applied function can then use that
/// series container to save heap allocations and swap arrow arrays.
pub fn with_unstable_series<F, T>(dtype: &DataType, f: F) -> T
where
    F: Fn(&mut UnstableSeries) -> T,
{
    let mut container = Series::full_null("", 0, dtype);
    let mut us = UnstableSeries::new(&mut container);

    f(&mut us)
}