implement ship behaviors

src/lib/sim/BuildingSystem.cpp

@@ -1,6 +1,7 @@
 #include "BuildingSystem.h"
 
 #include <cassert>
+#include <limits>
 #include <random>
 #include <set>
 
@@ -659,3 +660,61 @@ bool BuildingSystem::isTileOccupied(QPoint tile) const
 {
     return m_tileOccupancy.count({tile.x(), tile.y()}) > 0;
 }
+
+const Building* BuildingSystem::findNearestBuilding(QVector2D worldPos,
+                                                    BuildingType type) const
+{
+    const Building* best = nullptr;
+    float bestDist = std::numeric_limits<float>::max();
+    for (const Building& b : m_buildings)
+    {
+        if (b.type != type)
+        {
+            continue;
+        }
+        QVector2D center(b.anchor.x() + b.footprint.width()  / 2.0f,
+                         b.anchor.y() + b.footprint.height() / 2.0f);
+        float dist = (center - worldPos).length();
+        if (dist < bestDist)
+        {
+            bestDist = dist;
+            best = &b;
+        }
+    }
+    return best;
+}
+
+bool BuildingSystem::deliverScrapToSalvageBay(EntityId bayId)
+{
+    Building* bay = nullptr;
+    for (Building& b : m_buildings)
+    {
+        if (b.id == bayId)
+        {
+            bay = &b;
+            break;
+        }
+    }
+    if (!bay || bay->type != BuildingType::SalvageBay)
+    {
+        return false;
+    }
+    if (static_cast<int>(bay->outputBuffer.items.size()) >= bay->outputBuffer.capacity)
+    {
+        return false;
+    }
+    bay->outputBuffer.items.push_back(Item{ItemType{"scrap"}});
+    return true;
+}
+
+void BuildingSystem::healBuilding(EntityId id, float amount)
+{
+    for (Building& b : m_buildings)
+    {
+        if (b.id == id)
+        {
+            b.hp = std::min(b.hp + amount, b.maxHp);
+            return;
+        }
+    }
+}