1 files changed, 52 insertions, 0 deletions
diff --git a/src/openvic-simulation/economy/BuildingInstance.cpp b/src/openvic-simulation/economy/BuildingInstance.cpp
new file mode 100644
index 0000000..417cdda
--- /dev/null
+++ b/src/openvic-simulation/economy/BuildingInstance.cpp
@@ -0,0 +1,52 @@
+#include "BuildingInstance.hpp"
+
+using namespace OpenVic;
+
+BuildingInstance::BuildingInstance(BuildingType const& new_building_type, level_t new_level)
+	: HasIdentifier { building_type.get_identifier() }, building_type { new_building_type }, level { new_level },
+	expansion_state { ExpansionState::CannotExpand } {}
+
+bool BuildingInstance::_can_expand() const {
+	return level < building_type.get_max_level();
+}
+
+void BuildingInstance::set_level(BuildingInstance::level_t new_level) {
+	level = new_level;
+}
+
+bool BuildingInstance::expand() {
+	if (expansion_state == ExpansionState::CanExpand) {
+		expansion_state = ExpansionState::Preparing;
+		expansion_progress = 0.0f;
+		return true;
+	}
+	return false;
+}
+
+/* REQUIREMENTS:
+ * MAP-71, MAP-74, MAP-77
+ */
+void BuildingInstance::update_state(Date today) {
+	switch (expansion_state) {
+	case ExpansionState::Preparing:
+		start_date = today;
+		end_date = start_date + building_type.get_build_time();
+		break;
+	case ExpansionState::Expanding:
+		expansion_progress = static_cast<double>(today - start_date) / static_cast<double>(end_date - start_date);
+		break;
+	default: expansion_state = _can_expand() ? ExpansionState::CanExpand : ExpansionState::CannotExpand;
+	}
+}
+
+void BuildingInstance::tick(Date today) {
+	if (expansion_state == ExpansionState::Preparing) {
+		expansion_state = ExpansionState::Expanding;
+	}
+	if (expansion_state == ExpansionState::Expanding) {
+		if (end_date <= today) {
+			level++;
+			expansion_state = ExpansionState::CannotExpand;
+		}
+	}
+}