TBTR: Show warning on templates which include unavailable vehicles

src/lang/english.txt

@@ -6059,7 +6059,7 @@ STR_TMPL_TEMPLATE_OVR_VALUE_nogoldandcurrency                   :{TINY_FONT}{BLA
 STR_TMPL_TEMPLATE_OVR_VALUE_notinyfont                          :{BLACK}Buying Cost: {GOLD}{CURRENCY_LONG}
 STR_TMPL_TEMPLATE_OVR_VALUE_notinyfontandblack                  :Buying Cost: {GOLD}{CURRENCY_LONG}
 STR_TMPL_WARNING_FREE_WAGON                                     :{RED}Free Chain: not runnable!
-STR_TMPL_TEST                                                   :{ORANGE}Test String: {RAW_STRING} {RAW_STRING}
+STR_TMPL_WARNING_VEH_UNAVAILABLE                                :{RED}Train not buildable: vehicle unavailable!
 STR_TMPL_GROUP_USES_TEMPLATE                                    :{BLACK}Template in use: {NUM}
 STR_TMP_TEMPLATE_IN_USE                                         :Template is in use
 STR_TMPL_GROUP_NUM_TRAINS                                       :{BLACK}{NUM}

src/lang/german.txt

@@ -5848,7 +5848,6 @@ STR_TMPL_TEMPLATE_OVR_VALUE_nogoldandcurrency                   :{TINY_FONT}{BLA
 STR_TMPL_TEMPLATE_OVR_VALUE_notinyfont                          :{BLACK}Anschaffungskosten: {GOLD}{CURRENCY_LONG}
 STR_TMPL_TEMPLATE_OVR_VALUE_notinyfontandblack                  :Anschaffungskosten: {GOLD}{CURRENCY_LONG}
 STR_TMPL_WARNING_FREE_WAGON                                     :{RED}Unvollständiger Antriebsstrang: Zug kann nicht bewegt werden!
-STR_TMPL_TEST                                                   :{ORANGE}Test String: {STRING} {STRING}
 STR_TMPL_GROUP_USES_TEMPLATE                                    :{BLACK}Vorlage in Benutzung: {NUM}
 STR_TMP_TEMPLATE_IN_USE                                         :Vorlage ist in Benutzung
 STR_TMPL_GROUP_NUM_TRAINS                                       :{BLACK}{NUM}

src/lang/korean.txt

@@ -6038,7 +6038,6 @@ STR_TMPL_TEMPLATE_OVR_VALUE_nogoldandcurrency                   :{TINY_FONT}{BLA
 STR_TMPL_TEMPLATE_OVR_VALUE_notinyfont                          :{BLACK}구입 가격: {GOLD}{CURRENCY_LONG}
 STR_TMPL_TEMPLATE_OVR_VALUE_notinyfontandblack                  :구입 가격: {GOLD}{CURRENCY_LONG}
 STR_TMPL_WARNING_FREE_WAGON                                     :{RED}Free Chain: 운행할 수 없습니다!
-STR_TMPL_TEST                                                   :{ORANGE}시험 문자열: {STRING} {STRING}
 STR_TMPL_GROUP_USES_TEMPLATE                                    :{BLACK}사용 중인 템플릿: {NUM}
 STR_TMP_TEMPLATE_IN_USE                                         :템플릿이 사용 중입니다.
 STR_TMPL_GROUP_NUM_TRAINS                                       :{BLACK}{NUM}

src/tbtr_template_gui_create.cpp

@@ -307,19 +307,28 @@ public:
 					old_dpi = _cur_dpi;
 					_cur_dpi = &tmp_dpi;
 
+					int y = 4 - this->vscroll->GetPosition();
+					bool buildable = true;
+					for (Train *train = this->virtual_train; train != nullptr; train = train->Next()) {
+						if (!IsEngineBuildable(train->engine_type, VEH_TRAIN, train->owner)) buildable = false;
+					}
+					if (!buildable) {
+						DrawString(8, r.right, y, STR_TMPL_WARNING_VEH_UNAVAILABLE);
+						y += FONT_HEIGHT_NORMAL;
+					}
 					/* Draw vehicle performance info */
 					const GroundVehicleCache *gcache = this->virtual_train->GetGroundVehicleCache();
 					SetDParam(2, this->virtual_train->GetDisplayMaxSpeed());
 					SetDParam(1, gcache->cached_power);
 					SetDParam(0, gcache->cached_weight);
 					SetDParam(3, gcache->cached_max_te / 1000);
-					DrawString(8, r.right, 4 - this->vscroll->GetPosition(), STR_VEHICLE_INFO_WEIGHT_POWER_MAX_SPEED_MAX_TE);
+					DrawString(8, r.right, y, STR_VEHICLE_INFO_WEIGHT_POWER_MAX_SPEED_MAX_TE);
 					/* Draw cargo summary */
 					CargoArray cargo_caps;
 					for (const Train *tmp = this->virtual_train; tmp != nullptr; tmp = tmp->Next()) {
 						cargo_caps[tmp->cargo_type] += tmp->cargo_cap;
 					}
-					int y = 30 - this->vscroll->GetPosition();
+					y += 26;
 					for (CargoID i = 0; i < NUM_CARGO; ++i) {
 						if (cargo_caps[i] > 0) {
 							SetDParam(0, i);
@@ -444,10 +453,13 @@ public:
 		CargoArray cargo_caps;
 
 		if (virtual_train != nullptr) {
+			bool buildable = true;
 			for (Train *train = virtual_train; train != nullptr; train = train->Next()) {
 				width += train->GetDisplayImageWidth();
 				cargo_caps[train->cargo_type] += train->cargo_cap;
+				if (!IsEngineBuildable(train->engine_type, VEH_TRAIN, train->owner)) buildable = false;
 			}
+			if (!buildable) height += FONT_HEIGHT_NORMAL;
 
 			for (CargoID i = 0; i < NUM_CARGO; ++i) {
 				if (cargo_caps[i] > 0) {

src/tbtr_template_gui_main.cpp

@@ -660,6 +660,18 @@ public:
 				DrawString(left, right - ScaleGUITrad(24), y + ScaleGUITrad(2), STR_TMPL_WARNING_FREE_WAGON, TC_RED, SA_RIGHT);
 			}
 
+			bool buildable = true;
+			for (const TemplateVehicle *u = v; u != nullptr; u = u->Next()) {
+				if (!IsEngineBuildable(u->engine_type, VEH_TRAIN, u->owner)) {
+					buildable = false;
+					break;
+				}
+			}
+			/* Draw a notification string for chains that are not buildable */
+			if (!buildable) {
+				DrawString(left, right - ScaleGUITrad(24), y + ScaleGUITrad(2), STR_TMPL_WARNING_VEH_UNAVAILABLE, TC_RED, SA_CENTER);
+			}
+
 			/* Draw the template's length in tile-units */
 			SetDParam(0, v->GetRealLength());
 			SetDParam(1, 1);