use bevy::prelude::*;
use bevy::input::keyboard::KeyCode;

#[derive(Component)]
pub struct PanningCamera {
    pub pan_speed: f32,
}

pub fn camera_movement(
    keyboard_input: Res<ButtonInput<KeyCode>>,
    mut query: Query<(&PanningCamera, &mut Transform), With<Camera>>,
) {
    for (camera, mut transform) in query.iter_mut() {
        let mut direction = Vec2::ZERO;

        if keyboard_input.pressed(KeyCode::ArrowUp) {
            direction.y += 2.0;
        }
        if keyboard_input.pressed(KeyCode::ArrowDown) {
            direction.y -= 2.0;
        }
        if keyboard_input.pressed(KeyCode::ArrowLeft) {
            direction.x -= 2.0;
        }
        if keyboard_input.pressed(KeyCode::ArrowRight) {
            direction.x += 2.0;
        }

        if direction.length() > 0.0 {
            direction = direction.normalize();
            
            let movement = direction * camera.pan_speed;
            transform.translation.x += movement.x;
            transform.translation.y += movement.y;
        }
    }
}

pub fn spawn_panning_camera(mut commands: Commands) {
    commands.spawn((
        Camera2d::default(),
        Transform::from_xyz(0.,0.,10.),
        PanningCamera { pan_speed: 5.0 }
    ));
}