# TODO

**1. Core Gameplay Loop & State Management**

*   [x] **Player Lives**
    *   [x] Add a `PlayerLives` resource.
    *   [x] Decrement lives on collision.
    *   [x] Implement player destruction and respawn with temporary invincibility.
*   [x] **Game Over State**
    *   [x] Use Bevy's `States` (`Playing`, `GameOver`).
    *   [x] Transition to `GameOver` when lives reach zero.
    *   [x] Display a "Game Over" message.
*   [x] **Scoring**
    *   [x] Add a `Score` resource.
    *   [x] Increment score when an enemy is hit.
*   [x] **Levels/Stages**
    *   [x] Add `CurrentStage` and `StageConfigurations` resources.
    *   [x] Define criteria for clearing a stage.
    *   [x] Advance to the next stage with increasing difficulty.

**2. Enemy Behavior - Formations & Attack Patterns**

*   [x] **Enemy Formations**
    *   [x] Define target positions for formations (`FormationLayout`).
    *   [x] Enemies have an `Entering` state to fly to their position.
    *   [x] Enemies have an `InFormation` state.
*   [x] **Enemy Attack Dives**
    *   [x] Enemies have an `Attacking` state with different `AttackPattern`s (Swoop, Direct, Kamikaze).
    *   [x] Periodically trigger random enemies to start an attack dive.
    *   [x] Enemies fire bullets during their dives.
    *   [x] Enemies are despawned when they fly off-screen after an attack.
*   [x] **Enemy Variety**
    *   [x] `EnemyType` enum (`Grunt`, `Boss`).
    *   [x] Different behaviors, points, and colors based on type.

**3. Advanced Galaga Mechanics**

*   [ ] **Boss Galaga & Capture Beam**
    *   [x] Create a "Boss" enemy type.
    *   [x] Implement the tractor beam attack logic (`boss_capture_attack` system).
    *   [x] Player has a `Captured` component when hit by the beam.
    *   [x] Boss has a `ReturningWithCaptive` state to go back to the formation.
    *   [ ] Improve the tractor beam visual effect (currently a simple rectangle).
*   [ ] **Dual Fighter (Rescuing Captured Ship)**
    *   [ ] Allow the player to shoot a Boss that is holding a captured ship.
    *   [ ] Implement the logic to free the captured ship upon shooting the Boss.
    *   [ ] Implement the dual fighter mode (controlling two ships, firing two bullets).
*   [ ] **Challenging Stages**
    *   [ ] Implement a special stage type (e.g., every 3-4 levels).
    *   [ ] Design and implement intricate flight patterns for enemies that do not shoot.
    *   [ ] Award bonus points for destroying all enemies in the stage.

**4. Polish and User Interface**

*   [ ] **Visuals**
    *   [ ] Replace placeholder geometric shapes with actual sprites.
    *   [ ] Add explosion animations/effects.
    *   [x] Implement a scrolling starfield background.
*   [ ] **Audio**
    *   [ ] Integrate `bevy_audio`.
    *   [ ] Add sound effects (shooting, explosions, player death, tractor beam, etc.).
    *   [ ] Add background music.
*   [ ] **UI**
    *   [x] Display Score, Lives, and Stage in the window title.
    *   [ ] Display Score, Lives, and Stage on the screen using `bevy_ui`.
    *   [ ] Implement a High Score system (saving/loading).
    *   [x] Create a Start Menu state with a "Start Game" button.
    *   [ ] Add a "Press R to Restart" message to the `GameOver` screen and implement restart logic.