space-game/apps/backend/Simulation/AI/FactionController.cs

namespace SpaceGame.Simulation.Api.Simulation;

// ─── Planning State ────────────────────────────────────────────────────────────

public sealed class FactionPlanningState
{
  public int MilitaryShipCount { get; set; }
  public int MinerShipCount { get; set; }
  public int TransportShipCount { get; set; }
  public int ConstructorShipCount { get; set; }
  public int ControlledSystemCount { get; set; }
  public int TargetSystemCount { get; set; }
  public bool HasShipFactory { get; set; }
  public float OreStockpile { get; set; }
  public float RefinedMetalsStockpile { get; set; }

  public FactionPlanningState Clone() => (FactionPlanningState)MemberwiseClone();

  internal static int ComputeTargetWarships(FactionPlanningState state)
  {
    var expansionDeficit = Math.Max(0, state.TargetSystemCount - state.ControlledSystemCount);
    return Math.Max(2, (state.ControlledSystemCount * 2) + (expansionDeficit * 3));
  }
}

// ─── Goals ─────────────────────────────────────────────────────────────────────

public sealed class EnsureWarFleetGoal : GoapGoal<FactionPlanningState>
{
  public override string Name => "ensure-war-fleet";

  public override bool IsSatisfied(FactionPlanningState state) =>
      state.MilitaryShipCount >= FactionPlanningState.ComputeTargetWarships(state);

  public override float ComputePriority(FactionPlanningState state, SimulationWorld world, CommanderRuntime commander)
  {
    var deficit = FactionPlanningState.ComputeTargetWarships(state) - state.MilitaryShipCount;
    return deficit <= 0 ? 0f : 50f + (deficit * 10f);
  }
}

public sealed class ExpandTerritoryGoal : GoapGoal<FactionPlanningState>
{
  public override string Name => "expand-territory";

  public override bool IsSatisfied(FactionPlanningState state) =>
      state.ControlledSystemCount >= state.TargetSystemCount;

  public override float ComputePriority(FactionPlanningState state, SimulationWorld world, CommanderRuntime commander)
  {
    var deficit = state.TargetSystemCount - state.ControlledSystemCount;
    return deficit <= 0 ? 0f : 80f + (deficit * 15f);
  }
}

public sealed class EnsureMiningCapacityGoal : GoapGoal<FactionPlanningState>
{
  private const int MinMiners = 2;

  public override string Name => "ensure-mining-capacity";

  public override bool IsSatisfied(FactionPlanningState state) => state.MinerShipCount >= MinMiners;

  public override float ComputePriority(FactionPlanningState state, SimulationWorld world, CommanderRuntime commander)
  {
    var deficit = MinMiners - state.MinerShipCount;
    return deficit <= 0 ? 0f : 70f + (deficit * 12f);
  }
}

public sealed class EnsureConstructionCapacityGoal : GoapGoal<FactionPlanningState>
{
  private const int MinConstructors = 1;

  public override string Name => "ensure-construction-capacity";

  public override bool IsSatisfied(FactionPlanningState state) => state.ConstructorShipCount >= MinConstructors;

  public override float ComputePriority(FactionPlanningState state, SimulationWorld world, CommanderRuntime commander)
  {
    var deficit = MinConstructors - state.ConstructorShipCount;
    return deficit <= 0 ? 0f : 60f + (deficit * 10f);
  }
}

// ─── Actions ───────────────────────────────────────────────────────────────────

public sealed class OrderShipProductionAction : GoapAction<FactionPlanningState>
{
  private readonly string shipKind;
  private readonly string shipId;

  public OrderShipProductionAction(string shipKind, string shipId)
  {
    this.shipKind = shipKind;
    this.shipId = shipId;
  }

  public override string Name => $"order-{shipId}-production";
  public override float Cost => 1f;

  public override bool CheckPreconditions(FactionPlanningState state) => state.HasShipFactory;

  public override FactionPlanningState ApplyEffects(FactionPlanningState state)
  {
    switch (shipKind)
    {
      case "military": state.MilitaryShipCount++; break;
      case "mining": state.MinerShipCount++; break;
      case "transport": state.TransportShipCount++; break;
      case "construction": state.ConstructorShipCount++; break;
    }

    return state;
  }

  public override void Execute(SimulationEngine engine, SimulationWorld world, CommanderRuntime commander)
  {
    commander.ActiveDirectives.Add($"produce-{shipKind}-ships");
  }
}

public sealed class ExpandToSystemAction : GoapAction<FactionPlanningState>
{
  public override string Name => "expand-to-system";
  public override float Cost => 3f;

  public override bool CheckPreconditions(FactionPlanningState state) =>
      state.ConstructorShipCount > 0 && state.MilitaryShipCount >= 2;

  public override FactionPlanningState ApplyEffects(FactionPlanningState state)
  {
    state.ControlledSystemCount++;
    return state;
  }

  public override void Execute(SimulationEngine engine, SimulationWorld world, CommanderRuntime commander)
  {
    commander.ActiveDirectives.Add("expand-territory");
  }
}