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use freya_engine::prelude::*;
use freya_native_core::real_dom::NodeImmutable;
use freya_node_state::{
    AspectRatio,
    ReferencesState,
    StyleState,
    TransformState,
};

use super::utils::ElementUtils;
use crate::dom::DioxusNode;

pub struct ImageElement;

impl ElementUtils for ImageElement {
    fn render(
        self,
        layout_node: &torin::prelude::LayoutNode,
        node_ref: &DioxusNode,
        canvas: &Canvas,
        _font_collection: &mut FontCollection,
        _font_manager: &FontMgr,
        _default_fonts: &[String],
        _scale_factor: f32,
    ) {
        let area = layout_node.visible_area();
        let node_style = node_ref.get::<StyleState>().unwrap();
        let node_references = node_ref.get::<ReferencesState>().unwrap();
        let node_transform = node_ref.get::<TransformState>().unwrap();

        let draw_img = |bytes: &[u8]| {
            let pic = Image::from_encoded(unsafe { Data::new_bytes(bytes) });
            if let Some(pic) = pic {
                let mut paint = Paint::default();
                paint.set_anti_alias(true);

                let width_ratio = area.width() / pic.width() as f32;
                let height_ratio = area.height() / pic.height() as f32;

                let (width, height) = match node_transform.aspect_ratio {
                    AspectRatio::Max => {
                        let ratio = width_ratio.max(height_ratio);

                        (pic.width() as f32 * ratio, pic.height() as f32 * ratio)
                    }
                    AspectRatio::Min => {
                        let ratio = width_ratio.min(height_ratio);

                        (pic.width() as f32 * ratio, pic.height() as f32 * ratio)
                    }
                    AspectRatio::None => (area.width(), area.height()),
                };

                let rect = Rect::new(
                    area.min_x(),
                    area.min_y(),
                    area.min_x() + width,
                    area.min_y() + height,
                );
                canvas.draw_image_rect(pic, None, rect, &paint);
            }
        };

        if let Some(image_ref) = &node_references.image_ref {
            let image_data = image_ref.0.lock().unwrap();
            if let Some(image_data) = image_data.as_ref() {
                draw_img(image_data)
            }
        } else if let Some(image_data) = &node_style.image_data {
            draw_img(image_data.as_slice())
        }
    }
}