# GameCore

GameCore is the Kotlin runtime library shared by SteamWar game-mode plugins.
Its implementation is based on FightSystem, the most exhaustive game mode, and
contains the mechanics that do not depend on a specific arena:

- restartable Bukkit countdown scheduling, FightSystem milestone behavior,
  message/sound/level presentation policy, and shared skip behavior;
- generic team contracts, team lookup, readiness, and opposite-team handling;
- reusable winner/draw results and score/last-remaining evaluation;
- the complete state-dependent lifecycle (one-shots, tasks, listeners, commands,
  and countdowns);
- the FightSystem arena modes and shared JVM runtime configuration;
- observable, generic game-state transitions.

GameCore intentionally does not define a game-state enum. Each consumer supplies
its own enum to `GameStateMachine<S>` and the generic state-dependent classes, so
each game mode controls its valid states while sharing the lifecycle behavior.

```kotlin
enum class State { WAITING, RUNNING, END }

val lifecycle = GameStateMachine(State.WAITING)
StateDependentListener(
    lifecycle,
    true,
    setOf(State.RUNNING),
    plugin,
    ingameListener,
)
```

FightSystem, MissileWars, TNTLeague, and TowerRun retain their own messages,
inventories, listeners, schematics, and concrete win rules. They depend on the
GameCore plugin at runtime; GameCore itself depends on KotlinCore.