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use crate::{common::*, FromCv, IntoCv, TryFromCv};
use crate::image;
use crate::tch;
use std::ops::Deref;

impl<P, Container> FromCv<&image::ImageBuffer<P, Container>> for tch::Tensor
where
    P: image::Pixel + 'static,
    P::Subpixel: 'static + tch::kind::Element,
    Container: Deref<Target = [P::Subpixel]>,
{
    fn from_cv(from: &image::ImageBuffer<P, Container>) -> Self {
        let (width, height) = from.dimensions();
        let height = height as usize;
        let width = width as usize;
        let channels = P::CHANNEL_COUNT as usize;

        let buffer = unsafe {
            let buf_len = channels * height * width;
            let mut buffer: Vec<P::Subpixel> = Vec::with_capacity(buf_len);
            let ptr = buffer.as_mut_ptr();
            from.enumerate_pixels().for_each(|(x, y, pixel)| {
                let x = x as usize;
                let y = y as usize;
                pixel
                    .channels()
                    .iter()
                    .cloned()
                    .enumerate()
                    .for_each(|(c, component)| {
                        *ptr.add(x + width * (y + height * c)) = component;
                    });
            });
            buffer.set_len(buf_len);
            buffer
        };

        Self::of_slice(&buffer).view([channels as i64, height as i64, width as i64])
    }
}

impl<P, Container> FromCv<image::ImageBuffer<P, Container>> for tch::Tensor
where
    P: image::Pixel + 'static,
    P::Subpixel: 'static + tch::kind::Element,
    Container: Deref<Target = [P::Subpixel]>,
{
    fn from_cv(from: image::ImageBuffer<P, Container>) -> Self {
        Self::from_cv(&from)
    }
}

impl TryFromCv<&image::DynamicImage> for tch::Tensor {
    type Error = Error;

    fn try_from_cv(from: &image::DynamicImage) -> Result<Self, Self::Error> {
        use image::DynamicImage;

        let tensor = match from {
            DynamicImage::ImageLuma8(image) => image.into_cv(),
            DynamicImage::ImageLumaA8(image) => image.into_cv(),
            DynamicImage::ImageRgb8(image) => image.into_cv(),
            DynamicImage::ImageRgba8(image) => image.into_cv(),
            DynamicImage::ImageBgr8(image) => image.into_cv(),
            DynamicImage::ImageBgra8(image) => image.into_cv(),
            _ => bail!("cannot convert an image with u16 components to a tensor"),
        };
        Ok(tensor)
    }
}

impl TryFromCv<image::DynamicImage> for tch::Tensor {
    type Error = Error;

    fn try_from_cv(from: image::DynamicImage) -> Result<Self, Self::Error> {
        Self::try_from_cv(&from)
    }
}