//! Recreation of Georg Nees' ["Schotter" (1968-1970)](https://collections.vam.ac.uk/item/O221321/schotter-print-nees-georg/)
//! using whiskers.

use itertools::iproduct;
use whiskers::Runner;
use whiskers::prelude::*;

#[sketch_app]
pub struct SchotterSketch {
    col_count: u32,
    row_count: u32,

    #[param(slider, min = 0., max = 10.)]
    offset: Length,

    #[param(slider, min = 0., max = 10.)]
    box_size: Length,

    #[param(slider, deg, min = 0., max = 90.)]
    rand_angle: Angle,

    #[param(slider, min = 0., max = 3.)]
    rand_offset: Length,

    #[param(slider, min = 0., max = 10.)]
    stroke_width: f64,
}

impl Default for SchotterSketch {
    fn default() -> Self {
        Self {
            col_count: 12,
            row_count: 24,
            offset: 1.0 * Unit::Cm,
            box_size: 1.0 * Unit::Cm,
            rand_angle: Angle::from_deg(45.),
            rand_offset: 0.3 * Unit::Cm,
            stroke_width: 1.0,
        }
    }
}

impl App for SchotterSketch {
    fn update(&mut self, sketch: &mut Sketch, ctx: &mut Context) -> anyhow::Result<()> {
        sketch.stroke_width(self.stroke_width);

        for (i, j) in iproduct!(0..self.col_count, 0..self.row_count) {
            sketch.push_matrix_and(|sketch| {
                sketch.translate(i as f64 * self.offset, j as f64 * self.offset);

                let max_angle = self.rand_angle * (j as f64 / self.row_count as f64);
                let max_offset = self.rand_offset * (j as f64 / self.row_count as f64);

                sketch
                    .rotate(ctx.rng_range(-max_angle..max_angle))
                    .translate(
                        ctx.rng_range(-max_offset..max_offset),
                        ctx.rng_range(-max_offset..max_offset),
                    )
                    .rect(0., 0., self.box_size, self.box_size);
            });
        }

        Ok(())
    }
}

/// Create a configured runner for this sketch.
pub fn runner() -> Runner<'static, SchotterSketch> {
    SchotterSketch::runner()
        .with_layout_options(LayoutOptions::centered())
        .with_info_options(
            InfoOptions::default()
                .description(
                    "This sketch is a recreation of the classic \"Schotter\" series by Georg Nees \
                    (1968-1970).\n\nGeorg Nees (born 1926, Nuremberg) is considered one of the founders \
                    of computer art and graphics. He was also one of the first people to exhibit his \
                    computer graphics, at the studio gallery of the Technische Hochschule in Stuttgart in \
                    February 1965. In 1969, he received his doctorate on the subject of Generative \
                    Computer Graphics.",
                )
                .author("Antoine Beyeler")
                .author_url("https://bylr.info/")
                .source_url(
                    "https://github.com/abey79/vsvg/blob/master/crates/whiskers-gallery/src/sketches/schotter.rs",
                ),
        )
}