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use crate as burn;

use burn_tensor::ops::conv::calculate_conv_padding;

use crate::config::Config;
use crate::module::Module;

/// Padding configuration for 1D operators.
#[derive(Module, Config, Debug, PartialEq)]
pub enum PaddingConfig1d {
    /// Dynamically calculate the amount of padding necessary to ensure that the output size will be
    /// the same as the input.
    Same,
    /// Same as no padding.
    Valid,
    /// Applies the specified amount of padding to all inputs.
    Explicit(usize),
}

impl PaddingConfig1d {
    pub(crate) fn calculate_padding_1d(
        &self,
        length: usize,
        kernel_size: usize,
        stride: usize,
    ) -> usize {
        let same_padding = || calculate_conv_padding(kernel_size, stride, length, length);
        match self {
            Self::Valid => 0,
            Self::Same => same_padding(),
            Self::Explicit(value) => *value,
        }
    }
}

/// Padding configuration for 2D operators.
#[derive(Module, Config, Debug, PartialEq)]
pub enum PaddingConfig2d {
    /// Dynamically calculate the amount of padding necessary to ensure that the output size will be
    /// the same as the input.
    Same,
    /// Same as no padding.
    Valid,
    /// Applies the specified amount of padding to all inputs.
    Explicit(usize, usize),
}

impl PaddingConfig2d {
    pub(crate) fn calculate_padding_2d(
        &self,
        height: usize,
        width: usize,
        kernel_size: &[usize; 2],
        stride: &[usize; 2],
    ) -> [usize; 2] {
        let same_padding = || {
            let p1 = calculate_conv_padding(kernel_size[0], stride[0], height, height);
            let p2 = calculate_conv_padding(kernel_size[1], stride[1], width, width);

            [p1, p2]
        };

        match self {
            Self::Same => same_padding(),
            Self::Valid => [0, 0],
            Self::Explicit(v1, v2) => [*v1, *v2],
        }
    }
}