use super::{outline::OutlinePoints, outline_template::OutlineTemplate};

use crate::{LandGenerationParameters, LandGenerator};

use land2d::Land2D;

pub struct TemplatedLandGenerator {

    outline_template: OutlineTemplate,

}

impl TemplatedLandGenerator {

    pub fn new(outline_template: OutlineTemplate) -> Self {

        Self { outline_template }

    }

}

impl LandGenerator for TemplatedLandGenerator {

    fn generate_land<T: Copy + PartialEq + Default, I: Iterator<Item = u32>>(

        &self,

        parameters: &LandGenerationParameters<T>,

        random_numbers: &mut I,

    ) -> Land2D<T> {

        let do_invert = self.outline_template.is_negative

            && (!self.outline_template.can_invert || random_numbers.next().unwrap() & 1 == 0);

        let (basic, zero) = if do_invert {

            (parameters.zero, parameters.basic)

        } else {

            (parameters.basic, parameters.zero)

        };

        let mut land = Land2D::new(&self.outline_template.size, basic);

        let mut points = OutlinePoints::from_outline_template(

            &self.outline_template,

            land.play_box(),

            land.size().size(),

            random_numbers,

        );

        // mirror

        if self.outline_template.can_mirror {

            if let Some(b) = random_numbers.next() {

                if b & 1 != 0 {

                    points.mirror();

                }

            }

        }

        // flip

        if self.outline_template.can_flip {

            if let Some(b) = random_numbers.next() {

                if b & 1 != 0 {

                    points.flip();

                }

            }

        }

        if !parameters.skip_distort {

            let distortion_limiting_factor = 100 + random_numbers.next().unwrap() % 8 * 10;

            points.distort(

                parameters.distance_divisor,

                distortion_limiting_factor,

                random_numbers,

            );

        }

        if !parameters.skip_bezier {

            points.bezierize(5);

        }

        points.draw(&mut land, zero);

        for p in &points.fill_points {

            land.fill(*p, zero, zero)

        }

        points.draw(&mut land, basic);

        land

    }

}