use land2d::Land2D;

use LandGenerationParameters;

use LandGenerator;

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, I: Iterator<Item = u32>>(

        &self,

        parameters: LandGenerationParameters<T>,

        random_numbers: &mut I,

    ) -> Land2D<T> {

        let mut points =

            OutlinePoints::from_outline_template(&self.outline_template, random_numbers);

        let mut land = Land2D::new(points.size, parameters.basic);

        let top_left = Point::new(

            (land.width() - land.play_width() / 2) as i32,

            (land.height() - land.play_height()) as i32,

        );

        points.size = land.size();

        points.iter_mut().for_each(|p| *p += top_left);

        // mirror

        if self.outline_template.can_mirror {

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

                if b & 1 != 0 {

                    points

                        .iter_mut()

                        .for_each(|p| p.x = land.width() as i32 - 1 - p.x);

                }

            }

        }

        // flip

        if self.outline_template.can_flip {

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

                if b & 1 != 0 {

                    points

                        .iter_mut()

                        .for_each(|p| p.y = land.height() as i32 - 1 - p.y);

                }

            }

        }

        points.distort(random_numbers);

        points.draw(&mut land, parameters.zero);

        for p in &points.fill_points {

            land.fill(*p, parameters.zero, parameters.zero)

        }

        points.draw(&mut land, parameters.basic);

        land

    }

}

#[test()]

fn points_test() {

    let mut points = OutlinePoints {

        islands: vec![vec![]],

        fill_points: vec![Point::new(1, 1)],

        size: Size::square(100),

    };

    points.iter_mut().for_each(|p| p.x = 2);

    assert_eq!(points.fill_points[0].x, 2);

}