Implementation Approach

Core Principles

Our implementation of the Commander format follows these key principles:

1. Rules Accuracy - Faithfully implement the official Magic: The Gathering Comprehensive Rules for Commander (section 903)
2. Modularity - Clear separation of concerns between different aspects of the game engine
3. Testability - Comprehensive testing for complex rule interactions
4. Performance - Optimized for multiplayer games with up to 13 players
5. Extensibility - Easily accommodate new Commander variants and house rules

Technology Stack

The implementation uses the following technologies:

1. Bevy ECS - For game state management and systems organization
2. Rust - For type safety and performance
3. Event-driven architecture - For game actions and triggers
4. Automated testing - For rules validation and edge cases

Key Implementation Techniques

1. Component-Based Design

   #![allow(unused)]
   fn main() {
   // Components for different aspects of game entities
   #[derive(Component)]
   pub struct Commander {
       pub cast_count: u32,
   }
   
   #[derive(Component)]
   pub struct CommanderDamage {
       // Maps commander entity ID to damage received
       pub damage_received: HashMap<Entity, u32>,
   }
   }

2. Resource-Based Game State

   #![allow(unused)]
   fn main() {
   #[derive(Resource)]
   pub struct CommanderGameState {
       pub active_player_index: usize,
       pub player_order: Vec<Entity>,
       pub current_phase: Phase,
       // More fields
   }
   }

3. Event-Driven Actions

   #![allow(unused)]
   fn main() {
   #[derive(Event)]
   pub struct CommanderCastEvent {
       pub commander: Entity,
       pub player: Entity,
       pub from_zone: Zone,
   }
   }

4. Systems for Game Logic

   #![allow(unused)]
   fn main() {
   fn commander_damage_system(
       mut commands: Commands,
       game_state: Res<CommanderGameState>,
       mut damage_events: EventReader<CommanderDamageEvent>,
       mut players: Query<(Entity, &mut CommanderDamage)>,
   ) {
       // Logic implementation
   }
   }

Development Approach

1. Incremental Implementation

   • Start with core game state management
   • Layer in Commander-specific rules
   • Add multiplayer functionality
   • Implement special cases and edge conditions

2. Testing Strategy

   • Unit tests for individual components
   • Integration tests for system interactions
   • Scenario-based tests for complex rule interactions
   • Performance tests for multiplayer scenarios

3. Documentation

   • Comprehensive documentation of implementation details
   • Cross-referencing with official rules
   • Examples of complex interactions

This structured approach ensures a robust implementation of the Commander format that accurately reflects the official rules while maintaining performance and extensibility.