use crate::state::{MAX_SPEED, TAU};

const POINT_RADIUS: f64 = 0.01;

fn rand_color() -> String {
    let [r, g, b] = [
        fastrand::u8(0..255),
        fastrand::u8(0..255),
        fastrand::u8(0..255),
    ];
    format!("rgb({r} {g} {b})",)
}

#[derive(Clone, Debug)]
pub struct Point {
    pub x: f64,
    pub y: f64,
    pub radius: f64,
    pub heading: f64,
    pub speed: f64,
    pub color: String,
}

impl Point {
    pub fn new(x: f64, y: f64) -> Self {
        Self {
            x,
            y,
            radius: POINT_RADIUS,
            heading: fastrand::f64() * TAU,
            speed: fastrand::f64() * MAX_SPEED,
            color: rand_color(),
        }
    }

    pub fn equal_pos(&self, other: &Self) -> bool {
        self.x == other.x && self.y == other.y
    }

    pub fn dot(&self, other: &Self) -> f64 {
        self.x * other.x + self.y * other.y
    }

    pub fn mag(&self) -> f64 {
        (self.x.powi(2) + self.y.powi(2)).sqrt()
    }

    pub fn speed_x(&self) -> f64 {
        self.speed * self.heading.cos()
    }

    pub fn speed_y(&self) -> f64 {
        self.speed * self.heading.sin()
    }
}