use bevy::{prelude::*, render::camera::Viewport};
use bevy_pancam::{PanCam, PanCamPlugin};
use rand::prelude::random;

fn main() {
    App::new()
        .add_plugins((DefaultPlugins, PanCamPlugin::default()))
        .add_systems(Startup, setup)
        .run();
}

fn setup(mut commands: Commands) {
    commands.spawn((
        Camera2dBundle {
            camera: Camera {
                viewport: Some(Viewport {
                    physical_position: UVec2::new(100, 200),
                    physical_size: UVec2::new(600, 400),
                    depth: 0.0..1.0,
                }),
                ..Camera2dBundle::default().camera
            },
            ..default()
        },
        PanCam {
            min_x: -500.,
            min_y: -500.,
            max_x: 500.,
            max_y: 500.,
            ..default()
        },
    ));

    // background
    commands.spawn(SpriteBundle {
        sprite: Sprite {
            color: Color::srgb(0.3, 0.3, 0.3),
            custom_size: Some(Vec2::new(1000., 1000.)),
            ..default()
        },
        transform: Transform::from_xyz(0., 0., 0.),
        ..default()
    });

    // red square
    commands.spawn(SpriteBundle {
        sprite: Sprite {
            color: Color::srgb(0.8, 0.3, 0.3),
            custom_size: Some(Vec2::new(100., 100.)),
            ..default()
        },
        transform: Transform::from_xyz(0., 0., 1.),
        ..default()
    });
}