module objects

import gg
import rand

pub struct Rocket {
pub mut:
    color     gg.Color
    pos       Vector
    vel       Vector
    accel     Vector
    exploded  bool
    particles []Particle
    dead      bool
}

pub fn (rocket Rocket) draw(mut ctx gg.Context) {
    ctx.draw_circle_filled(rocket.pos.x, get_params().height - rocket.pos.y,
        get_params().rocket_radius, rocket.color)
}

pub fn (mut rocket Rocket) explode() {
    rocket.exploded = true

    for _ in 0 .. get_params().offspring_count {
        rocket.spawn_particle()
    }
}

pub fn (mut rocket Rocket) tick(mut ctx gg.Context) {
    if !rocket.exploded {
        if rocket.vel.y <= 1 {
            rocket.explode()
        }

        rocket.accel += get_params().gravity
        rocket.vel += rocket.accel
        rocket.pos += rocket.vel
        rocket.draw(mut ctx)

        rocket.accel = Vector{}
    }

    for mut particle in rocket.particles {
        particle.tick(mut rocket, mut ctx)
    }
}

pub fn new_rocket() Rocket {
    return Rocket{
        color: random_color()
        pos:   Vector{
            x: rand.f32_in_range(50, get_params().width - 50) or { 50 }
        }
        vel:   Vector{
            x: rand.f32_in_range(-1.5, 1.5) or { -1.5 }
            y: rand.f32_in_range(5, 7) or { 5 }
        }
    }
}

pub fn (mut rocket Rocket) spawn_particle() {
    rocket.particles << Particle{
        color: rocket.color
        pos:   rocket.pos
        accel: random_vector_in_circle().mult(2)
    }
}