use glam::Vec2;

use crate::content::vfx::VfxMaterialId;

pub struct VfxLine {
    pub a: Vec2,
    pub b: Vec2,
    pub width: f32,
    pub material: VfxMaterialId,
    pub alive_for: f32,
    pub lifetime: f32,
}

impl VfxLine {
    pub fn new(a: Vec2, b: Vec2, width: f32, material: VfxMaterialId, lifetime: f32) -> Self {
        VfxLine {
            a,
            b,
            width,
            material,
            alive_for: 0.0,
            lifetime,
        }
    }
}

pub trait VfxWriter {
    fn write_vfx_line(&mut self, line: VfxLine) -> ();
}

pub struct VfxManager {
    pub lines: Vec<VfxLine>,
}

impl VfxManager {
    pub fn after_render(&mut self, delta_time: f32) {
        let mut i = 0;
        while i < self.lines.len() {
            let l = &mut self.lines[i];
            l.alive_for += delta_time;
            if l.alive_for > l.lifetime {
                self.lines.swap_remove(i);
                continue;
            }
            i += 1;
        }
    }

    pub fn new() -> Self {
        VfxManager { lines: Vec::new() }
    }
}

impl VfxWriter for VfxManager {
    fn write_vfx_line(&mut self, line: VfxLine) {
        self.lines.push(line);
    }
}