use bevy::prelude::*;

use crate::player::Player;

pub struct CameraPlugin;

impl Plugin for CameraPlugin {
    fn build(&self, app: &mut App) {
        // Spawn in the camera on startup, only 1 instance
        app.add_systems(Startup, spawn_camera);

        // We're so good..
        // Update the camera position ever game loop iteration
        app.add_systems(Update, move_camera);
    }
}

fn spawn_camera(mut commands: Commands) {
    let mut camera = Camera2dBundle::default();
    // Bigger decimal, further it zooms in
    // 0.5 is closer to level than 1.0
    camera.projection.scale = 0.3;

    commands.spawn(camera);
}

// THIS NEEDS TO BE IN THE UPDATE LOOP LOL
// We don't need to get player position to snap
// when spawning, it does that here lol
// - Mjork
fn move_camera(
    mut camera: Query<&mut Transform, (With<Camera2d>, Without<Player>)>,
    player: Query<&Transform, (With<Player>, Without<Camera2d>)>,
    time: Res<Time>,
) {
    // Get the only instance of camera
    let Ok(mut camera) = camera.get_single_mut() else {
        return;
    };

    // Get the only instance of player MIGUEL
    let Ok(player) = player.get_single() else {
        return;
    };

    // Smoothly follow the player
    let player_position = Vec3::new(
        player.translation.x,
        player.translation.y,
        camera.translation.z,
    );
    camera.translation = camera
        .translation
        .lerp(player_position, time.delta_seconds() * 2.0);
}