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use crate as burn;

use crate::config::Config;
use crate::module::Module;
use crate::tensor::backend::Backend;
use crate::tensor::Tensor;
use burn_tensor::module::adaptive_avg_pool2d;

/// Configuration to create a [2D adaptive avg pooling](AdaptiveAvgPool2d) layer.
#[derive(Config)]
pub struct AdaptiveAvgPool2dConfig {
    /// The size of the output.
    pub output_size: [usize; 2],
}

/// Applies a 2D adaptive avg pooling over input tensors.
#[derive(Module, Clone, Debug)]
pub struct AdaptiveAvgPool2d {
    output_size: [usize; 2],
}

impl AdaptiveAvgPool2dConfig {
    /// Initialize a new [adaptive avg pool 2d](AdaptiveAvgPool2d) module.
    pub fn init(&self) -> AdaptiveAvgPool2d {
        AdaptiveAvgPool2d {
            output_size: self.output_size,
        }
    }
}

impl AdaptiveAvgPool2d {
    /// Applies the forward pass on the input tensor.
    ///
    /// # Shapes
    ///
    /// - input: [batch_size, channels, height_in, width_in],
    /// - output: [batch_size, channels, height_out, width_out],
    pub fn forward<B: Backend>(&self, input: Tensor<B, 4>) -> Tensor<B, 4> {
        adaptive_avg_pool2d(input, self.output_size)
    }
}