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//! Draw polygon

use crate::{
    math::{Matrix2d, Scalar},
    triangulation, types,
    types::Color,
    DrawState, Graphics,
};

/// A polygon
#[derive(Copy, Clone)]
pub struct Polygon {
    /// The color of the polygon
    pub color: Color,
}

impl Polygon {
    /// Creates new polygon
    pub fn new(color: Color) -> Polygon {
        Polygon { color }
    }

    /// Sets color.
    pub fn color(mut self, color: Color) -> Self {
        self.color = color;
        self
    }

    /// Draws polygon using the default method.
    #[inline(always)]
    pub fn draw<G>(
        &self,
        polygon: types::Polygon<'_>,
        draw_state: &DrawState,
        transform: Matrix2d,
        g: &mut G,
    ) where
        G: Graphics,
    {
        g.polygon(self, polygon, draw_state, transform);
    }

    /// Draws polygon using triangulation.
    pub fn draw_tri<G>(
        &self,
        polygon: types::Polygon<'_>,
        draw_state: &DrawState,
        transform: Matrix2d,
        g: &mut G,
    ) where
        G: Graphics,
    {
        g.tri_list(draw_state, &self.color, |f| {
            triangulation::with_polygon_tri_list(transform, polygon, |vertices| f(vertices))
        });
    }

    /// Draws tweened polygon with linear interpolation, using default method.
    #[inline(always)]
    pub fn draw_tween_lerp<G>(
        &self,
        polygons: types::Polygons<'_>,
        tween_factor: Scalar,
        draw_state: &DrawState,
        transform: Matrix2d,
        g: &mut G,
    ) where
        G: Graphics,
    {
        g.polygon_tween_lerp(self, polygons, tween_factor, draw_state, transform);
    }

    /// Draws tweened polygon with linear interpolation, using triangulation.
    pub fn draw_tween_lerp_tri<G>(
        &self,
        polygons: types::Polygons<'_>,
        tween_factor: Scalar,
        draw_state: &DrawState,
        transform: Matrix2d,
        g: &mut G,
    ) where
        G: Graphics,
    {
        if self.color[3] == 0.0 {
            return;
        }
        g.tri_list(draw_state, &self.color, |f| {
            triangulation::with_lerp_polygons_tri_list(
                transform,
                polygons,
                tween_factor,
                |vertices| f(vertices),
            )
        });
    }
}

#[cfg(test)]
mod test {
    use super::*;

    #[test]
    fn test_polygon() {
        let _polygon = Polygon::new([1.0; 4]).color([0.0; 4]);
    }
}