From 5a6a738d3822a3d36c24a7a1e136682a3d8594e1 Mon Sep 17 00:00:00 2001
From: cwspain <cwspain@gmail.com>
Date: Sat, 18 Nov 2023 11:09:38 -0600
Subject: [PATCH] Don't require fuel for fixed wing with prop mod and fusion,
 fission, or solar engine.

---
 .../megamek/client/ui/swing/MovementDisplay.java   |  2 +-
 megamek/src/megamek/common/FixedWingSupport.java   | 14 ++++++++++----
 megamek/src/megamek/common/IAero.java              |  4 ++++
 3 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/megamek/src/megamek/client/ui/swing/MovementDisplay.java b/megamek/src/megamek/client/ui/swing/MovementDisplay.java
index 39ab6c74e5..e4c3243c25 100644
--- a/megamek/src/megamek/client/ui/swing/MovementDisplay.java
+++ b/megamek/src/megamek/client/ui/swing/MovementDisplay.java
@@ -4110,7 +4110,7 @@ private void checkFuel() {
         }
 
         IAero aero = (IAero) ce;
-        if ((aero.getCurrentFuel() < 1) && !(ce.hasEngine() && ce.getEngine().isSolar())) {
+        if ((aero.getCurrentFuel() < 1) && aero.requiresFuel()) {
             disableButtons();
             butDone.setEnabled(true);
             getBtn(MoveCommand.MOVE_NEXT).setEnabled(true);
diff --git a/megamek/src/megamek/common/FixedWingSupport.java b/megamek/src/megamek/common/FixedWingSupport.java
index 10dec9c75a..fa01afb6c8 100644
--- a/megamek/src/megamek/common/FixedWingSupport.java
+++ b/megamek/src/megamek/common/FixedWingSupport.java
@@ -135,12 +135,11 @@ public boolean hasPropChassisMod() {
      * @return The mass of each point of fuel in kg.
      */
     public int kgPerFuelPoint() {
+        if (!requiresFuel()) {
+            return 0;
+        }
         int kg = KG_PER_FUEL_POINT[getWeightClass() - EntityWeightClass.WEIGHT_SMALL_SUPPORT][getEngineTechRating()];
         if (hasPropChassisMod() || getMovementMode().equals(EntityMovementMode.AIRSHIP)) {
-            if (getEngine().isFusion() || (getEngine().getEngineType() == Engine.FISSION)
-                    || (getEngine().getEngineType() == Engine.SOLAR)) {
-                return 0;
-            }
             kg = (int) Math.ceil(kg * 0.75);
         }
         return kg;
@@ -157,6 +156,13 @@ public double getFuelPointsPerTon() {
         return 1000.0 / kgPerFuelPoint();
     }
 
+    @Override
+    public boolean requiresFuel() {
+        return !(((hasPropChassisMod() || getMovementMode().isAirship()))
+                && hasEngine() && (getEngine().isFusion() || (getEngine().getEngineType() == Engine.FISSION)
+                || (getEngine().getEngineType() == Engine.SOLAR)));
+    }
+
     private static final TechAdvancement TA_FIXED_WING_SUPPORT = new TechAdvancement(TECH_BASE_ALL)
             .setAdvancement(DATE_PS, DATE_PS, DATE_PS)
             .setTechRating(RATING_B).setAvailability(RATING_C, RATING_D, RATING_C, RATING_C)
diff --git a/megamek/src/megamek/common/IAero.java b/megamek/src/megamek/common/IAero.java
index 13179ec299..baf5da7717 100644
--- a/megamek/src/megamek/common/IAero.java
+++ b/megamek/src/megamek/common/IAero.java
@@ -146,6 +146,10 @@ default int getClusterMods() {
 
     double getFuelPointsPerTon();
 
+    default boolean requiresFuel() {
+        return true;
+    }
+
     // Capital fighters
     int getCapArmor();