use crate::prelude::*;
use image::DynamicImage;

pub struct Image {
    handle: TextureHandle,
}

impl Widget for Image {
    fn draw(&mut self, painter: &mut Painter) {
        painter.texture(&self.handle);
    }

    fn desired_width(&mut self, _: &mut SizeCtx) -> Len {
        Len::abs(self.handle.size().x)
    }

    fn desired_height(&mut self, _: &mut SizeCtx) -> Len {
        Len::abs(self.handle.size().y)
    }
}

pub fn image(image: impl LoadableImage) -> impl WidgetFn<Image> {
    let image = image.get_image().expect("Failed to load image");
    move |ui| Image {
        handle: ui.add_texture(image),
    }
}

pub trait LoadableImage {
    fn get_image(self) -> Result<DynamicImage, String>;
}

impl LoadableImage for &str {
    fn get_image(self) -> Result<DynamicImage, String> {
        image::open(self).map_err(|e| format!("{e:?}"))
    }
}

impl LoadableImage for String {
    fn get_image(self) -> Result<DynamicImage, String> {
        image::open(self).map_err(|e| format!("{e:?}"))
    }
}

impl<const LEN: usize> LoadableImage for &[u8; LEN] {
    fn get_image(self) -> Result<DynamicImage, String> {
        image::load_from_memory(self).map_err(|e| format!("{e:?}"))
    }
}

impl LoadableImage for DynamicImage {
    fn get_image(self) -> Result<DynamicImage, String> {
        Ok(self)
    }
}