#![allow(dead_code)]

use domain::{Color, Dimensions, DomainError, Point2D, ScreensaverScene, Sprite, Vector2D};

pub const LOGO: Dimensions = size(200, 100);
pub const ROOMY: Dimensions = size(800, 600);
pub const TINY: Dimensions = size(50, 50);

pub const SNUG: Dimensions = size(LOGO.width() + 2, LOGO.height() + 2);
pub const EDGE_ONLY: Dimensions = size(LOGO.width() + 2, ROOMY.height());

pub const SPEED: Vector2D = velocity(3.0, 2.0);
pub const RED: Color = Color {
    r: 255,
    g: 0,
    b: 0,
    a: 255,
};

pub const fn size(width: u32, height: u32) -> Dimensions {
    match Dimensions::new(width, height) {
        Some(size) => size,
        None => panic!("test dimensions must be non-zero"),
    }
}

const fn velocity(dx: f32, dy: f32) -> Vector2D {
    match Vector2D::new(dx, dy) {
        Some(velocity) => velocity,
        None => panic!("test velocity must be finite"),
    }
}

pub fn point(x: f32, y: f32) -> Point2D {
    Point2D::new(x, y).expect("test point must be finite")
}

pub fn try_scene(logo: Dimensions, bounds: Dimensions) -> Result<ScreensaverScene, DomainError> {
    ScreensaverScene::new(logo, SPEED, RED, bounds)
}

pub fn scene_in(bounds: Dimensions) -> ScreensaverScene {
    try_scene(LOGO, bounds).expect("LOGO must fit the test bounds")
}

pub fn advance(scene: &mut ScreensaverScene, bounds: Dimensions, frames: u32) {
    for _ in 0..frames {
        scene.tick(bounds);
    }
}

pub fn sprite_count(scene: &ScreensaverScene) -> usize {
    scene.sprites().count()
}

pub fn logo_sprite(scene: &ScreensaverScene) -> Sprite {
    scene.sprites().next().expect("the logo is always present")
}

pub fn bottom_right(bounds: Dimensions) -> Point2D {
    point(bounds.width() as f32, bounds.height() as f32)
}