use super::base64_serde;
use super::layer_info::LayerData;
use super::style::{RenderData, ViewMode};
use crate::intersection::{intersect_quad_bez_path, Quad};
use crate::layers::text_layer::FontCache;
use crate::LayerId;

use glam::{DAffine2, DMat2, DVec2};
use graph_craft::proto::Type;
use kurbo::{Affine, BezPath, Shape as KurboShape};
use serde::{Deserialize, Serialize};
use std::borrow::Cow;
use std::fmt::Write;

#[derive(Clone, Debug, PartialEq, Deserialize, Serialize)]
pub struct NodeGraphFrameLayer {
	// Image stored in layer after generation completes
	pub mime: String,

	/// The document node network that this layer contains
	pub network: graph_craft::document::NodeNetwork,

	// TODO: Have the browser dispose of this blob URL when this is dropped (like when the layer is deleted)
	#[serde(skip)]
	pub blob_url: Option<String>,
	#[serde(skip)]
	pub dimensions: DVec2,
	pub image_data: Option<ImageData>,
}

#[derive(Debug, Clone, Eq, PartialEq, Deserialize, Serialize)]
pub struct ImageData {
	#[serde(serialize_with = "base64_serde::as_base64", deserialize_with = "base64_serde::from_base64")]
	pub image_data: std::rc::Rc<Vec<u8>>,
}

impl LayerData for NodeGraphFrameLayer {
	fn render(&mut self, svg: &mut String, _svg_defs: &mut String, transforms: &mut Vec<DAffine2>, render_data: RenderData) {
		let transform = self.transform(transforms, render_data.view_mode);
		let inverse = transform.inverse();

		let (width, height) = (transform.transform_vector2(DVec2::new(1., 0.)).length(), transform.transform_vector2(DVec2::new(0., 1.)).length());

		if !inverse.is_finite() {
			let _ = write!(svg, "<!-- SVG shape has an invalid transform -->");
			return;
		}

		let _ = writeln!(svg, r#"<g transform="matrix("#);
		inverse.to_cols_array().iter().enumerate().for_each(|(i, entry)| {
			let _ = svg.write_str(&(entry.to_string() + if i == 5 { "" } else { "," }));
		});
		let _ = svg.write_str(r#")">"#);

		let matrix = (transform * DAffine2::from_scale((width, height).into()).inverse())
			.to_cols_array()
			.iter()
			.enumerate()
			.fold(String::new(), |val, (i, entry)| val + &(entry.to_string() + if i == 5 { "" } else { "," }));

		if let Some(blob_url) = &self.blob_url {
			let _ = write!(
				svg,
				r#"<image width="{}" height="{}" preserveAspectRatio="none" href="{}" transform="matrix({})" />"#,
				width.abs(),
				height.abs(),
				blob_url,
				matrix
			);
		}
		let _ = write!(
			svg,
			r#"<rect width="{}" height="{}" fill="none" stroke="var(--color-data-vector)" stroke-width="3" stroke-dasharray="8" transform="matrix({})" />"#,
			width.abs(),
			height.abs(),
			matrix,
		);

		let _ = svg.write_str(r#"</g>"#);
	}

	fn bounding_box(&self, transform: glam::DAffine2, _font_cache: &FontCache) -> Option<[DVec2; 2]> {
		let mut path = self.bounds();

		if transform.matrix2 == DMat2::ZERO {
			return None;
		}
		path.apply_affine(glam_to_kurbo(transform));

		let kurbo::Rect { x0, y0, x1, y1 } = path.bounding_box();
		Some([(x0, y0).into(), (x1, y1).into()])
	}

	fn intersects_quad(&self, quad: Quad, path: &mut Vec<LayerId>, intersections: &mut Vec<Vec<LayerId>>, _font_cache: &FontCache) {
		if intersect_quad_bez_path(quad, &self.bounds(), true) {
			intersections.push(path.clone());
		}
	}
}

impl NodeGraphFrameLayer {
	pub fn transform(&self, transforms: &[DAffine2], mode: ViewMode) -> DAffine2 {
		let start = match mode {
			ViewMode::Outline => 0,
			_ => (transforms.len() as i32 - 1).max(0) as usize,
		};
		transforms.iter().skip(start).cloned().reduce(|a, b| a * b).unwrap_or(DAffine2::IDENTITY)
	}

	fn bounds(&self) -> BezPath {
		kurbo::Rect::from_origin_size(kurbo::Point::ZERO, kurbo::Size::new(1., 1.)).to_path(0.)
	}
}

fn glam_to_kurbo(transform: DAffine2) -> Affine {
	Affine::new(transform.to_cols_array())
}

impl Default for NodeGraphFrameLayer {
	fn default() -> Self {
		use graph_craft::document::*;
		use graph_craft::proto::NodeIdentifier;

		Self {
			mime: String::new(),
			network: NodeNetwork {
				inputs: vec![0],
				output: 1,
				nodes: [
					(
						0,
						DocumentNode {
							name: "Input".into(),
							inputs: vec![NodeInput::Network],
							implementation: DocumentNodeImplementation::Unresolved(NodeIdentifier::new("graphene_core::ops::IdNode", &[Type::Generic(Cow::Borrowed("T"))])),
							metadata: DocumentNodeMetadata { position: (8, 4) },
						},
					),
					(
						1,
						DocumentNode {
							name: "Output".into(),
							inputs: vec![NodeInput::Node(0)],
							implementation: DocumentNodeImplementation::Unresolved(NodeIdentifier::new("graphene_core::ops::IdNode", &[Type::Generic(Cow::Borrowed("T"))])),
							metadata: DocumentNodeMetadata { position: (20, 4) },
						},
					),
				]
				.into_iter()
				.collect(),
			},
			blob_url: None,
			dimensions: DVec2::ZERO,
			image_data: None,
		}
	}
}