implement building system

src/lib/sim/Simulation.cpp

@@ -1,15 +1,33 @@
 #include "Simulation.h"
 
+#include "BuildingSystem.h"
+
 Simulation::Simulation(const GameConfig& config, unsigned int seed)
     : m_config(config)
     , m_rng(seed)
     , m_currentTick(0)
     , m_nextId(1)
+    , m_buildingBlocksStock(config.world.startingBuildingBlocks)
+    , m_beltSystem(config.world.beltSpeedTilesPerSecond)
 {
+    m_buildingSystem = std::make_unique<BuildingSystem>(
+        config,
+        m_beltSystem,
+        [this]() { return allocateId(); },
+        [this](int amount) { m_buildingBlocksStock += amount; },
+        m_rng);
 }
 
+Simulation::~Simulation() = default;
+
 void Simulation::tick()
 {
+    m_buildingSystem->tickConstruction(m_currentTick);
+    m_buildingSystem->tickBeltPull();       // tick order step 3
+    m_buildingSystem->tickProduction(m_currentTick);  // step 4
+    m_buildingSystem->tickBeltPush();       // step 5
+    m_beltSystem.tick();                    // step 6
+
     ++m_currentTick;
 }
 
@@ -32,6 +50,31 @@ Tick Simulation::currentTick() const
     return m_currentTick;
 }
 
+int Simulation::buildingBlocksStock() const
+{
+    return m_buildingBlocksStock;
+}
+
+BuildingSystem& Simulation::buildings()
+{
+    return *m_buildingSystem;
+}
+
+const BuildingSystem& Simulation::buildings() const
+{
+    return *m_buildingSystem;
+}
+
+BeltSystem& Simulation::belts()
+{
+    return m_beltSystem;
+}
+
+const BeltSystem& Simulation::belts() const
+{
+    return m_beltSystem;
+}
+
 EntityId Simulation::allocateId()
 {
     return m_nextId++;