use measure_time::debug_time;

use crate::{LineSegment, Shape, graphics::objects::ObjectSizes};

use super::{renderable::SVGRenderable, svg};

impl SVGRenderable for Shape {
    fn render_to_svg(
        &self,
        colormap: crate::ColorMapping,
        cell_size: usize,
        object_sizes: crate::graphics::objects::ObjectSizes,
        id: &str,
    ) -> anyhow::Result<svg::Node> {
        debug_time!("render_to_svg/object");
        let rendered = match self {
            Shape::Text(..) | Shape::CenteredText(..) => {
                self.render_text(cell_size)
            }
            Shape::Rectangle(..) => self.render_rectangle(cell_size),
            Shape::Polygon(..) => self.render_polygon(cell_size),
            Shape::Line(..) => self.render_line(cell_size),
            Shape::CurveInward(..) | Shape::CurveOutward(..) => {
                self.render_curve(cell_size)
            }
            Shape::BigDot(..)
            | Shape::Dot(..)
            | Shape::BigCircle(..)
            | Shape::SmallCircle(..) => {
                self.render_circle(cell_size, object_sizes)
            }
            Shape::Image(..) => self.render_image(cell_size),
            Shape::Component { .. } => {
                self.render_component(colormap, cell_size, object_sizes, id)
            }
            Shape::RawSVG { .. } => {
                unimplemented!("RawSVG shapes require an Object to render")
            }
        };

        Ok(match rendered {
            svg::Node::Element(el) => el.dataset("object", id).into(),
            svg::Node::SVG(svg) => {
                if svg.trim().starts_with("<") {
                    let (before, after) =
                        svg.split_once(' ').unwrap_or(svg.split_once(">").expect("Malformed SVG tag, {svg} starts with < but doesn't contain a space or >"));
                    svg::Node::SVG(format!(
                        r#"{before} data-object="{id}" {after}"#
                    ))
                } else {
                    eprintln!("Malformed raw SVG, {svg} doesn't start with <");
                    svg::Node::SVG(svg)
                }
            }
            _ => {
                panic!("Expected Element or SVG, got {:?}", rendered);
            }
        })
    }
}

impl Shape {
    fn render_image(&self, cell_size: usize) -> svg::Node {
        if let Shape::Image(region, path) = self {
            return svg::tag("image")
                .coords(region.start.coords(cell_size))
                .attr("width", region.width() * cell_size)
                .attr("height", region.height() * cell_size)
                .attr("href", path.clone())
                .into();
        }

        panic!("Expected Image, got {:?}", self);
    }

    fn render_component(
        &self,
        colormap: crate::ColorMapping,
        cell_size: usize,
        object_sizes: crate::graphics::objects::ObjectSizes,
        id: &str,
    ) -> svg::Node {
        if let Shape::Component {
            at,
            size: (real_w, real_h),
            objects,
        } = self
        {
            let (object_w, object_h) = objects
                .iter()
                .map(|o| o.position().xy())
                .fold((0, 0), |(max_w, max_h), (w, h)| {
                    (max_w.max(w) + 1, max_h.max(h) + 1)
                });

            let percent =
                |num: usize, den: usize| format!("{}%", (num * 100) / (den));

            return svg::tag("svg")
                .coords(at.coords(cell_size))
                .dataset("nested-dims", format!("{object_w}x{object_h}"))
                .style(
                    "transform",
                    format!(
                        "scale({}, {})",
                        percent(*real_w, object_w),
                        percent(*real_h, object_h)
                    ),
                )
                .wrapping(objects.iter().map(move |o| {
                    o.render_to_svg(colormap.clone(), cell_size, object_sizes, id)
                        .expect("Could not render component object to SVG")
                }))
                .into();
        }

        panic!("Expected Component, got {:?}", self);
    }

    fn render_text(&self, cell_size: usize) -> svg::Node {
        match self {
            Shape::Text(position, content, font_size)
            | Shape::CenteredText(position, content, font_size) => {
                let centered = matches!(self, Shape::CenteredText(..));

                svg::tag("text")
                    .coords(
                        if centered {
                            position.as_centered()
                        } else {
                            position.as_corner()
                        }
                        .coords(cell_size),
                    )
                    .attr("font-size", format!("{}pt", font_size))
                    .attr("font-family", "Inconsolata")
                    .attr(
                        "dominant-baseline",
                        if centered { "middle" } else { "hanging" },
                    )
                    .attr(
                        "text-anchor",
                        if centered { "middle" } else { "start" },
                    )
                    .wrapping(vec![svg::Node::Text(content.to_string())])
                    .into()
            }
            _ => panic!("Expected Text, got {:?}", self),
        }
    }

    // fn render_fitted_text(&self, cell_size: usize) -> svg::Node {
    //     if let Object::FittedText(region, content) = self {
    //         let (x, y) = region.start.coords(cell_size);
    //         let width = region.width() * cell_size as f32;
    //         let height = region.height() * cell_size as f32;

    //         return Box::new(
    //             svg::node::element::Text::new(content.clone())
    //                 .set("x", x)
    //                 .set("y", y)
    //                 .set("")
    //                 .set("font-size", format!("{}pt", 10.0))
    //                 .set("font-family", "sans-serif"),
    //         );
    //     }

    //     panic!("Expected FittedText, got {:?}", self);
    // }

    fn render_rectangle(&self, cell_size: usize) -> svg::Node {
        if let Shape::Rectangle(start, end) = self {
            return svg::tag("rect").region((start, end), cell_size).into();
        }

        panic!("Expected Rectangle, got {:?}", self);
    }

    fn render_polygon(&self, cell_size: usize) -> svg::Node {
        if let Shape::Polygon(start, lines) = self {
            let mut path = svg::Path::new();
            path.move_to(*start, cell_size);
            for line in lines {
                match line {
                    LineSegment::Straight(end)
                    | LineSegment::InwardCurve(end)
                    | LineSegment::OutwardCurve(end) => {
                        path.line_to(*end, cell_size);
                    }
                };
            }
            path.close();
            return path.node();
        }

        panic!("Expected Polygon, got {:?}", self);
    }

    fn render_line(&self, cell_size: usize) -> svg::Node {
        if let Shape::Line(start, end, width) = self {
            return svg::tag("line")
                .position_pair(*start, *end, cell_size)
                .attr("stroke-width", *width)
                .into();
        }

        panic!("Expected Line, got {:?}", self);
    }

    fn render_curve(&self, cell_size: usize) -> svg::Node {
        if let Shape::CurveOutward(start, end, stroke_width)
        | Shape::CurveInward(start, end, stroke_width) = self
        {
            let inward = matches!(self, Shape::CurveInward(..));

            let (start_x, start_y) = start.coords(cell_size);
            let (end_x, end_y) = end.coords(cell_size);

            let midpoint = ((start_x + end_x) / 2.0, (start_y + end_y) / 2.0);
            let start_from_midpoint =
                (start_x - midpoint.0, start_y - midpoint.1);
            let end_from_midpoint = (end_x - midpoint.0, end_y - midpoint.1);

            let control = {
                let relative = (end_x - start_x, end_y - start_y);
                if start_from_midpoint.0 * start_from_midpoint.1 > 0.0
                    && end_from_midpoint.0 * end_from_midpoint.1 > 0.0
                {
                    if inward {
                        (
                            midpoint.0 + relative.0.abs() / 2.0,
                            midpoint.1 - relative.1.abs() / 2.0,
                        )
                    } else {
                        (
                            midpoint.0 - relative.0.abs() / 2.0,
                            midpoint.1 + relative.1.abs() / 2.0,
                        )
                    }
                // diagonal line is going like this: /
                } else if start_from_midpoint.0 * start_from_midpoint.1 < 0.0
                    && end_from_midpoint.0 * end_from_midpoint.1 < 0.0
                {
                    if inward {
                        (
                            midpoint.0 - relative.0.abs() / 2.0,
                            midpoint.1 - relative.1.abs() / 2.0,
                        )
                    } else {
                        (
                            midpoint.0 + relative.0.abs() / 2.0,
                            midpoint.1 + relative.1.abs() / 2.0,
                        )
                    }
                // line is horizontal
                } else if start_y == end_y {
                    (
                        midpoint.0,
                        midpoint.1
                            + (if inward { -1.0 } else { 1.0 })
                                * relative.0.abs()
                                / 2.0,
                    )
                // line is vertical
                } else if start_x == end_x {
                    (
                        midpoint.0
                            + (if inward { -1.0 } else { 1.0 })
                                * relative.1.abs()
                                / 2.0,
                        midpoint.1,
                    )
                } else {
                    unreachable!()
                }
            };

            let mut path = svg::Path::new();
            path.move_to(*start, cell_size);
            path.quadratic_curve_to(control, *end, cell_size);
            return path
                .element()
                .attr("stroke-width", format!("{stroke_width}"))
                .into();
        }

        panic!("Expected Curve, got {:?}", self);
    }

    fn render_circle(
        &self,
        cell_size: usize,
        object_sizes: ObjectSizes,
    ) -> svg::Node {
        let center = match self {
            Shape::BigDot(at) | Shape::Dot(at) => at.coords(cell_size),
            Shape::BigCircle(at) | Shape::SmallCircle(at) => {
                at.as_centered().coords(cell_size)
            }

            _ => panic!(
                "Expected BigDot, Dot, BigCircle or SmallCircle, got {:?}",
                self
            ),
        };

        let radius = match self {
            Shape::BigDot(_) => object_sizes.small_circle_radius,
            Shape::Dot(_) => object_sizes.dot_radius,
            Shape::BigCircle(_) => cell_size as f32 / 2.0,
            Shape::SmallCircle(_) => object_sizes.small_circle_radius,
            _ => unreachable!(),
        };

        return svg::tag("circle")
            .attr("cx", center.0)
            .attr("cy", center.1)
            .attr("r", radius)
            .into();
    }
}