autoreplace_cmd.cpp

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00001 /* $Id: autoreplace_cmd.cpp 15434 2009-02-09 21:20:05Z rubidium $ */
00002 
00005 #include "stdafx.h"
00006 #include "company_func.h"
00007 #include "vehicle_gui.h"
00008 #include "train.h"
00009 #include "rail.h"
00010 #include "command_func.h"
00011 #include "engine_base.h"
00012 #include "engine_func.h"
00013 #include "vehicle_func.h"
00014 #include "functions.h"
00015 #include "autoreplace_func.h"
00016 #include "articulated_vehicles.h"
00017 #include "core/alloc_func.hpp"
00018 
00019 #include "table/strings.h"
00020 
00027 static bool EnginesGotCargoInCommon(EngineID engine_a, EngineID engine_b, VehicleType type)
00028 {
00029   uint32 available_cargos_a = GetUnionOfArticulatedRefitMasks(engine_a, type, true);
00030   uint32 available_cargos_b = GetUnionOfArticulatedRefitMasks(engine_b, type, true);
00031   return (available_cargos_a == 0 || available_cargos_b == 0 || (available_cargos_a & available_cargos_b) != 0);
00032 }
00033 
00041 bool CheckAutoreplaceValidity(EngineID from, EngineID to, CompanyID company)
00042 {
00043   /* First we make sure that it's a valid type the user requested
00044    * check that it's an engine that is in the engine array */
00045   if (!IsEngineIndex(from) || !IsEngineIndex(to)) return false;
00046 
00047   /* we can't replace an engine into itself (that would be autorenew) */
00048   if (from == to) return false;
00049 
00050   VehicleType type = GetEngine(from)->type;
00051 
00052   /* check that the new vehicle type is available to the company and its type is the same as the original one */
00053   if (!IsEngineBuildable(to, type, company)) return false;
00054 
00055   switch (type) {
00056     case VEH_TRAIN: {
00057       const RailVehicleInfo *rvi_from = RailVehInfo(from);
00058       const RailVehicleInfo *rvi_to   = RailVehInfo(to);
00059 
00060       /* make sure the railtypes are compatible */
00061       if ((GetRailTypeInfo(rvi_from->railtype)->compatible_railtypes & GetRailTypeInfo(rvi_to->railtype)->compatible_railtypes) == 0) return false;
00062 
00063       /* make sure we do not replace wagons with engines or vise versa */
00064       if ((rvi_from->railveh_type == RAILVEH_WAGON) != (rvi_to->railveh_type == RAILVEH_WAGON)) return false;
00065       break;
00066     }
00067 
00068     case VEH_ROAD:
00069       /* make sure that we do not replace a tram with a normal road vehicles or vise versa */
00070       if (HasBit(EngInfo(from)->misc_flags, EF_ROAD_TRAM) != HasBit(EngInfo(to)->misc_flags, EF_ROAD_TRAM)) return false;
00071       break;
00072 
00073     case VEH_AIRCRAFT:
00074       /* make sure that we do not replace a plane with a helicopter or vise versa */
00075       if ((AircraftVehInfo(from)->subtype & AIR_CTOL) != (AircraftVehInfo(to)->subtype & AIR_CTOL)) return false;
00076       break;
00077 
00078     default: break;
00079   }
00080 
00081   /* the engines needs to be able to carry the same cargo */
00082   return EnginesGotCargoInCommon(from, to, type);
00083 }
00084 
00090 static void TransferCargo(Vehicle *old_veh, Vehicle *new_head, bool part_of_chain)
00091 {
00092   assert(!part_of_chain || new_head->IsPrimaryVehicle());
00093   /* Loop through source parts */
00094   for (Vehicle *src = old_veh; src != NULL; src = src->Next()) {
00095     if (!part_of_chain && src->type == VEH_TRAIN && src != old_veh && src != old_veh->u.rail.other_multiheaded_part && !IsArticulatedPart(src)) {
00096       /* Skip vehicles, which do not belong to old_veh */
00097       src = GetLastEnginePart(src);
00098       continue;
00099     }
00100     if (src->cargo_type >= NUM_CARGO || src->cargo.Count() == 0) continue;
00101 
00102     /* Find free space in the new chain */
00103     for (Vehicle *dest = new_head; dest != NULL && src->cargo.Count() > 0; dest = dest->Next()) {
00104       if (!part_of_chain && dest->type == VEH_TRAIN && dest != new_head && dest != new_head->u.rail.other_multiheaded_part && !IsArticulatedPart(dest)) {
00105         /* Skip vehicles, which do not belong to new_head */
00106         dest = GetLastEnginePart(dest);
00107         continue;
00108       }
00109       if (dest->cargo_type != src->cargo_type) continue;
00110 
00111       uint amount = min(src->cargo.Count(), dest->cargo_cap - dest->cargo.Count());
00112       if (amount <= 0) continue;
00113 
00114       src->cargo.MoveTo(&dest->cargo, amount);
00115     }
00116   }
00117 
00118   /* Update train weight etc., the old vehicle will be sold anyway */
00119   if (part_of_chain && new_head->type == VEH_TRAIN) TrainConsistChanged(new_head, true);
00120 }
00121 
00128 static bool VerifyAutoreplaceRefitForOrders(const Vehicle *v, EngineID engine_type)
00129 {
00130   const Order *o;
00131   const Vehicle *u;
00132 
00133   uint32 union_refit_mask_a = GetUnionOfArticulatedRefitMasks(v->engine_type, v->type, false);
00134   uint32 union_refit_mask_b = GetUnionOfArticulatedRefitMasks(engine_type, v->type, false);
00135 
00136   if (v->type == VEH_TRAIN) {
00137     u = v->First();
00138   } else {
00139     u = v;
00140   }
00141 
00142   FOR_VEHICLE_ORDERS(u, o) {
00143     if (!o->IsRefit()) continue;
00144     CargoID cargo_type = o->GetRefitCargo();
00145 
00146     if (!HasBit(union_refit_mask_a, cargo_type)) continue;
00147     if (!HasBit(union_refit_mask_b, cargo_type)) return false;
00148   }
00149 
00150   return true;
00151 }
00152 
00162 static CargoID GetNewCargoTypeForReplace(Vehicle *v, EngineID engine_type, bool part_of_chain)
00163 {
00164   CargoID cargo_type;
00165 
00166   if (GetUnionOfArticulatedRefitMasks(engine_type, v->type, true) == 0) return CT_NO_REFIT; // Don't try to refit an engine with no cargo capacity
00167 
00168   if (IsArticulatedVehicleCarryingDifferentCargos(v, &cargo_type)) return CT_INVALID; // We cannot refit to mixed cargos in an automated way
00169 
00170   uint32 available_cargo_types = GetIntersectionOfArticulatedRefitMasks(engine_type, v->type, true);
00171 
00172   if (cargo_type == CT_INVALID) {
00173     if (v->type != VEH_TRAIN) return CT_NO_REFIT; // If the vehicle does not carry anything at all, every replacement is fine.
00174 
00175     if (!part_of_chain) return CT_NO_REFIT;
00176 
00177     /* the old engine didn't have cargo capacity, but the new one does
00178      * now we will figure out what cargo the train is carrying and refit to fit this */
00179 
00180     for (v = v->First(); v != NULL; v = v->Next()) {
00181       if (v->cargo_cap == 0) continue;
00182       /* Now we found a cargo type being carried on the train and we will see if it is possible to carry to this one */
00183       if (HasBit(available_cargo_types, v->cargo_type)) {
00184         /* Do we have to refit the vehicle, or is it already carrying the right cargo? */
00185         uint16 *default_capacity = GetCapacityOfArticulatedParts(engine_type, v->type);
00186         for (CargoID cid = 0; cid < NUM_CARGO; cid++) {
00187           if (cid != v->cargo_type && default_capacity[cid] > 0) return v->cargo_type;
00188         }
00189 
00190         return CT_NO_REFIT;
00191       }
00192     }
00193 
00194     return CT_NO_REFIT; // We failed to find a cargo type on the old vehicle and we will not refit the new one
00195   } else {
00196     if (!HasBit(available_cargo_types, cargo_type)) return CT_INVALID; // We can't refit the vehicle to carry the cargo we want
00197 
00198     if (part_of_chain && !VerifyAutoreplaceRefitForOrders(v, engine_type)) return CT_INVALID; // Some refit orders lose their effect
00199 
00200     /* Do we have to refit the vehicle, or is it already carrying the right cargo? */
00201     uint16 *default_capacity = GetCapacityOfArticulatedParts(engine_type, v->type);
00202     for (CargoID cid = 0; cid < NUM_CARGO; cid++) {
00203       if (cid != cargo_type && default_capacity[cid] > 0) return cargo_type;
00204     }
00205 
00206     return CT_NO_REFIT;
00207   }
00208 }
00209 
00215 static EngineID GetNewEngineType(const Vehicle *v, const Company *c)
00216 {
00217   assert(v->type != VEH_TRAIN || !IsArticulatedPart(v));
00218 
00219   if (v->type == VEH_TRAIN && IsRearDualheaded(v)) {
00220     /* we build the rear ends of multiheaded trains with the front ones */
00221     return INVALID_ENGINE;
00222   }
00223 
00224   EngineID e = EngineReplacementForCompany(c, v->engine_type, v->group_id);
00225 
00226   if (e != INVALID_ENGINE && IsEngineBuildable(e, v->type, _current_company)) {
00227     return e;
00228   }
00229 
00230   if (v->NeedsAutorenewing(c) && // replace if engine is too old
00231       IsEngineBuildable(v->engine_type, v->type, _current_company)) { // engine can still be build
00232     return v->engine_type;
00233   }
00234 
00235   return INVALID_ENGINE;
00236 }
00237 
00245 static CommandCost BuildReplacementVehicle(Vehicle *old_veh, Vehicle **new_vehicle, bool part_of_chain)
00246 {
00247   *new_vehicle = NULL;
00248 
00249   /* Shall the vehicle be replaced? */
00250   const Company *c = GetCompany(_current_company);
00251   EngineID e = GetNewEngineType(old_veh, c);
00252   if (e == INVALID_ENGINE) return CommandCost(); // neither autoreplace is set, nor autorenew is triggered
00253 
00254   /* Does it need to be refitted */
00255   CargoID refit_cargo = GetNewCargoTypeForReplace(old_veh, e, part_of_chain);
00256   if (refit_cargo == CT_INVALID) return CommandCost(); // incompatible cargos
00257 
00258   /* Build the new vehicle */
00259   CommandCost cost = DoCommand(old_veh->tile, e, 0, DC_EXEC | DC_AUTOREPLACE, GetCmdBuildVeh(old_veh));
00260   if (cost.Failed()) return cost;
00261 
00262   Vehicle *new_veh = GetVehicle(_new_vehicle_id);
00263   *new_vehicle = new_veh;
00264 
00265   /* Refit the vehicle if needed */
00266   if (refit_cargo != CT_NO_REFIT) {
00267     cost.AddCost(DoCommand(0, new_veh->index, refit_cargo, DC_EXEC, GetCmdRefitVeh(new_veh)));
00268     assert(cost.Succeeded()); // This should be ensured by GetNewCargoTypeForReplace()
00269   }
00270 
00271   /* Try to reverse the vehicle, but do not care if it fails as the new type might not be reversible */
00272   if (new_veh->type == VEH_TRAIN && HasBit(old_veh->u.rail.flags, VRF_REVERSE_DIRECTION)) {
00273     DoCommand(0, new_veh->index, true, DC_EXEC, CMD_REVERSE_TRAIN_DIRECTION);
00274   }
00275 
00276   return cost;
00277 }
00278 
00284 static inline CommandCost StartStopVehicle(const Vehicle *v, bool evaluate_callback)
00285 {
00286   return DoCommand(0, v->index, evaluate_callback ? 1 : 0, DC_EXEC | DC_AUTOREPLACE, CMD_START_STOP_VEHICLE);
00287 }
00288 
00295 static inline CommandCost MoveVehicle(const Vehicle *v, const Vehicle *after, DoCommandFlag flags, bool whole_chain)
00296 {
00297   return DoCommand(0, v->index | (after != NULL ? after->index : INVALID_VEHICLE) << 16, whole_chain ? 1 : 0, flags, CMD_MOVE_RAIL_VEHICLE);
00298 }
00299 
00305 static CommandCost CopyHeadSpecificThings(Vehicle *old_head, Vehicle *new_head, DoCommandFlag flags)
00306 {
00307   CommandCost cost = CommandCost();
00308 
00309   /* Share orders */
00310   if (cost.Succeeded() && old_head != new_head) cost.AddCost(DoCommand(0, (old_head->index << 16) | new_head->index, CO_SHARE, DC_EXEC, CMD_CLONE_ORDER));
00311 
00312   /* Copy group membership */
00313   if (cost.Succeeded() && old_head != new_head) cost.AddCost(DoCommand(0, old_head->group_id, new_head->index, DC_EXEC, CMD_ADD_VEHICLE_GROUP));
00314 
00315   /* Perform start/stop check whether the new vehicle suits newgrf restrictions etc. */
00316   if (cost.Succeeded()) {
00317     /* Start the vehicle, might be denied by certain things */
00318     assert((new_head->vehstatus & VS_STOPPED) != 0);
00319     cost.AddCost(StartStopVehicle(new_head, true));
00320 
00321     /* Stop the vehicle again, but do not care about evil newgrfs allowing starting but not stopping :p */
00322     if (cost.Succeeded()) cost.AddCost(StartStopVehicle(new_head, false));
00323   }
00324 
00325   /* Last do those things which do never fail (resp. we do not care about), but which are not undo-able */
00326   if (cost.Succeeded() && old_head != new_head && (flags & DC_EXEC) != 0) {
00327     /* Copy vehicle name */
00328     if (old_head->name != NULL) {
00329       DoCommand(0, new_head->index, 0, DC_EXEC | DC_AUTOREPLACE, CMD_RENAME_VEHICLE, old_head->name);
00330     }
00331 
00332     /* Copy other things which cannot be copied by a command and which shall not stay resetted from the build vehicle command */
00333     new_head->CopyVehicleConfigAndStatistics(old_head);
00334 
00335     /* Switch vehicle windows to the new vehicle, so they are not closed when the old vehicle is sold */
00336     ChangeVehicleViewWindow(old_head->index, new_head->index);
00337   }
00338 
00339   return cost;
00340 }
00341 
00349 static CommandCost ReplaceFreeUnit(Vehicle **single_unit, DoCommandFlag flags, bool *nothing_to_do)
00350 {
00351   Vehicle *old_v = *single_unit;
00352   assert(old_v->type == VEH_TRAIN && !IsArticulatedPart(old_v) && !IsRearDualheaded(old_v));
00353 
00354   CommandCost cost = CommandCost(EXPENSES_NEW_VEHICLES, 0);
00355 
00356   /* Build and refit replacement vehicle */
00357   Vehicle *new_v = NULL;
00358   cost.AddCost(BuildReplacementVehicle(old_v, &new_v, false));
00359 
00360   /* Was a new vehicle constructed? */
00361   if (cost.Succeeded() && new_v != NULL) {
00362     *nothing_to_do = false;
00363 
00364     if ((flags & DC_EXEC) != 0) {
00365       /* Move the new vehicle behind the old */
00366       MoveVehicle(new_v, old_v, DC_EXEC, false);
00367 
00368       /* Take over cargo
00369        * Note: We do only transfer cargo from the old to the new vehicle.
00370        *       I.e. we do not transfer remaining cargo to other vehicles.
00371        *       Else you would also need to consider moving cargo to other free chains,
00372        *       or doing the same in ReplaceChain(), which would be quite troublesome.
00373        */
00374       TransferCargo(old_v, new_v, false);
00375 
00376       *single_unit = new_v;
00377     }
00378 
00379     /* Sell the old vehicle */
00380     cost.AddCost(DoCommand(0, old_v->index, 0, flags, GetCmdSellVeh(old_v)));
00381 
00382     /* If we are not in DC_EXEC undo everything */
00383     if ((flags & DC_EXEC) == 0) {
00384       DoCommand(0, new_v->index, 0, DC_EXEC, GetCmdSellVeh(new_v));
00385     }
00386   }
00387 
00388   return cost;
00389 }
00390 
00398 static CommandCost ReplaceChain(Vehicle **chain, DoCommandFlag flags, bool wagon_removal, bool *nothing_to_do)
00399 {
00400   Vehicle *old_head = *chain;
00401   assert(old_head->IsPrimaryVehicle());
00402 
00403   CommandCost cost = CommandCost(EXPENSES_NEW_VEHICLES, 0);
00404 
00405   if (old_head->type == VEH_TRAIN) {
00406     /* Store the length of the old vehicle chain, rounded up to whole tiles */
00407     uint16 old_total_length = (old_head->u.rail.cached_total_length + TILE_SIZE - 1) / TILE_SIZE * TILE_SIZE;
00408 
00409     int num_units = 0; 
00410     for (Vehicle *w = old_head; w != NULL; w = GetNextUnit(w)) num_units++;
00411 
00412     Vehicle **old_vehs = CallocT<Vehicle *>(num_units); 
00413     Vehicle **new_vehs = CallocT<Vehicle *>(num_units); 
00414     Money *new_costs = MallocT<Money>(num_units);       
00415 
00416     /* Collect vehicles and build replacements
00417      * Note: The replacement vehicles can only successfully build as long as the old vehicles are still in their chain */
00418     int i;
00419     Vehicle *w;
00420     for (w = old_head, i = 0; w != NULL; w = GetNextUnit(w), i++) {
00421       assert(i < num_units);
00422       old_vehs[i] = w;
00423 
00424       CommandCost ret = BuildReplacementVehicle(old_vehs[i], &new_vehs[i], true);
00425       cost.AddCost(ret);
00426       if (cost.Failed()) break;
00427 
00428       new_costs[i] = ret.GetCost();
00429       if (new_vehs[i] != NULL) *nothing_to_do = false;
00430     }
00431     Vehicle *new_head = (new_vehs[0] != NULL ? new_vehs[0] : old_vehs[0]);
00432 
00433     /* Note: When autoreplace has already failed here, old_vehs[] is not completely initialized. But it is also not needed. */
00434     if (cost.Succeeded()) {
00435       /* Separate the head, so we can start constructing the new chain */
00436       Vehicle *second = GetNextUnit(old_head);
00437       if (second != NULL) cost.AddCost(MoveVehicle(second, NULL, DC_EXEC | DC_AUTOREPLACE, true));
00438 
00439       assert(GetNextUnit(new_head) == NULL);
00440 
00441       /* Append engines to the new chain
00442        * We do this from back to front, so that the head of the temporary vehicle chain does not change all the time.
00443        * OTOH the vehicle attach callback is more expensive this way :s */
00444       Vehicle *last_engine = NULL; 
00445       if (cost.Succeeded()) {
00446         for (int i = num_units - 1; i > 0; i--) {
00447           Vehicle *append = (new_vehs[i] != NULL ? new_vehs[i] : old_vehs[i]);
00448 
00449           if (RailVehInfo(append->engine_type)->railveh_type == RAILVEH_WAGON) continue;
00450 
00451           if (last_engine == NULL) last_engine = append;
00452           cost.AddCost(MoveVehicle(append, new_head, DC_EXEC, false));
00453           if (cost.Failed()) break;
00454         }
00455         if (last_engine == NULL) last_engine = new_head;
00456       }
00457 
00458       /* When wagon removal is enabled and the new engines without any wagons are already longer than the old, we have to fail */
00459       if (cost.Succeeded() && wagon_removal && new_head->u.rail.cached_total_length > old_total_length) cost = CommandCost(STR_TRAIN_TOO_LONG_AFTER_REPLACEMENT);
00460 
00461       /* Append/insert wagons into the new vehicle chain
00462        * We do this from back to front, so we can stop when wagon removal or maximum train length (i.e. from mammoth-train setting) is triggered.
00463        */
00464       if (cost.Succeeded()) {
00465         for (int i = num_units - 1; i > 0; i--) {
00466           assert(last_engine != NULL);
00467           Vehicle *append = (new_vehs[i] != NULL ? new_vehs[i] : old_vehs[i]);
00468 
00469           if (RailVehInfo(append->engine_type)->railveh_type == RAILVEH_WAGON) {
00470             /* Insert wagon after 'last_engine' */
00471             CommandCost res = MoveVehicle(append, last_engine, DC_EXEC, false);
00472 
00473             if (res.Succeeded() && wagon_removal && new_head->u.rail.cached_total_length > old_total_length) {
00474               MoveVehicle(append, NULL, DC_EXEC | DC_AUTOREPLACE, false);
00475               break;
00476             }
00477 
00478             cost.AddCost(res);
00479             if (cost.Failed()) break;
00480           } else {
00481             /* We have reached 'last_engine', continue with the next engine towards the front */
00482             assert(append == last_engine);
00483             last_engine = GetPrevUnit(last_engine);
00484           }
00485         }
00486       }
00487 
00488       /* Sell superfluous new vehicles that could not be inserted. */
00489       if (cost.Succeeded() && wagon_removal) {
00490         for (int i = 1; i < num_units; i++) {
00491           Vehicle *wagon = new_vehs[i];
00492           if (wagon == NULL) continue;
00493           if (wagon->First() == new_head) break;
00494 
00495           assert(RailVehInfo(wagon->engine_type)->railveh_type == RAILVEH_WAGON);
00496 
00497           /* Sell wagon */
00498           CommandCost ret = DoCommand(0, wagon->index, 0, DC_EXEC, GetCmdSellVeh(wagon));
00499           assert(ret.Succeeded());
00500           new_vehs[i] = NULL;
00501 
00502           /* Revert the money subtraction when the vehicle was built.
00503            * This value is different from the sell value, esp. because of refitting */
00504           cost.AddCost(-new_costs[i]);
00505         }
00506       }
00507 
00508       /* The new vehicle chain is constructed, now take over orders and everything... */
00509       if (cost.Succeeded()) cost.AddCost(CopyHeadSpecificThings(old_head, new_head, flags));
00510 
00511       if (cost.Succeeded()) {
00512         /* Success ! */
00513         if ((flags & DC_EXEC) != 0 && new_head != old_head) {
00514           *chain = new_head;
00515         }
00516 
00517         /* Transfer cargo of old vehicles and sell them*/
00518         for (int i = 0; i < num_units; i++) {
00519           Vehicle *w = old_vehs[i];
00520           /* Is the vehicle again part of the new chain?
00521            * Note: We cannot test 'new_vehs[i] != NULL' as wagon removal might cause to remove both */
00522           if (w->First() == new_head) continue;
00523 
00524           if ((flags & DC_EXEC) != 0) TransferCargo(w, new_head, true);
00525 
00526           cost.AddCost(DoCommand(0, w->index, 0, flags, GetCmdSellVeh(w)));
00527           if ((flags & DC_EXEC) != 0) {
00528             old_vehs[i] = NULL;
00529             if (i == 0) old_head = NULL;
00530           }
00531         }
00532       }
00533 
00534       /* If we are not in DC_EXEC undo everything, i.e. rearrange old vehicles.
00535        * We do this from back to front, so that the head of the temporary vehicle chain does not change all the time.
00536        * Note: The vehicle attach callback is disabled here :) */
00537       if ((flags & DC_EXEC) == 0) {
00538         /* Separate the head, so we can reattach the old vehicles */
00539         Vehicle *second = GetNextUnit(old_head);
00540         if (second != NULL) MoveVehicle(second, NULL, DC_EXEC | DC_AUTOREPLACE, true);
00541 
00542         assert(GetNextUnit(old_head) == NULL);
00543 
00544         for (int i = num_units - 1; i > 0; i--) {
00545           CommandCost ret = MoveVehicle(old_vehs[i], old_head, DC_EXEC | DC_AUTOREPLACE, false);
00546           assert(ret.Succeeded());
00547         }
00548       }
00549     }
00550 
00551     /* Finally undo buying of new vehicles */
00552     if ((flags & DC_EXEC) == 0) {
00553       for (int i = num_units - 1; i >= 0; i--) {
00554         if (new_vehs[i] != NULL) {
00555           DoCommand(0, new_vehs[i]->index, 0, DC_EXEC, GetCmdSellVeh(new_vehs[i]));
00556           new_vehs[i] = NULL;
00557         }
00558       }
00559     }
00560 
00561     free(old_vehs);
00562     free(new_vehs);
00563     free(new_costs);
00564   } else {
00565     /* Build and refit replacement vehicle */
00566     Vehicle *new_head = NULL;
00567     cost.AddCost(BuildReplacementVehicle(old_head, &new_head, true));
00568 
00569     /* Was a new vehicle constructed? */
00570     if (cost.Succeeded() && new_head != NULL) {
00571       *nothing_to_do = false;
00572 
00573       /* The new vehicle is constructed, now take over orders and everything... */
00574       cost.AddCost(CopyHeadSpecificThings(old_head, new_head, flags));
00575 
00576       if (cost.Succeeded()) {
00577         /* The new vehicle is constructed, now take over cargo */
00578         if ((flags & DC_EXEC) != 0) {
00579           TransferCargo(old_head, new_head, true);
00580           *chain = new_head;
00581         }
00582 
00583         /* Sell the old vehicle */
00584         cost.AddCost(DoCommand(0, old_head->index, 0, flags, GetCmdSellVeh(old_head)));
00585       }
00586 
00587       /* If we are not in DC_EXEC undo everything */
00588       if ((flags & DC_EXEC) == 0) {
00589         DoCommand(0, new_head->index, 0, DC_EXEC, GetCmdSellVeh(new_head));
00590       }
00591     }
00592   }
00593 
00594   return cost;
00595 }
00596 
00604 CommandCost CmdAutoreplaceVehicle(TileIndex tile, DoCommandFlag flags, uint32 p1, uint32 p2, const char *text)
00605 {
00606   CommandCost cost = CommandCost(EXPENSES_NEW_VEHICLES, 0);
00607   bool nothing_to_do = true;
00608 
00609   if (!IsValidVehicleID(p1)) return CMD_ERROR;
00610   Vehicle *v = GetVehicle(p1);
00611   if (!CheckOwnership(v->owner)) return CMD_ERROR;
00612   if (!v->IsInDepot()) return CMD_ERROR;
00613   if (HASBITS(v->vehstatus, VS_CRASHED)) return CMD_ERROR;
00614 
00615   bool free_wagon = false;
00616   if (v->type == VEH_TRAIN) {
00617     if (IsArticulatedPart(v) || IsRearDualheaded(v)) return CMD_ERROR;
00618     free_wagon = !IsFrontEngine(v);
00619     if (free_wagon && IsFrontEngine(v->First())) return CMD_ERROR;
00620   } else {
00621     if (!v->IsPrimaryVehicle()) return CMD_ERROR;
00622   }
00623 
00624   const Company *c = GetCompany(_current_company);
00625   bool wagon_removal = c->renew_keep_length;
00626 
00627   /* Test whether any replacement is set, before issuing a whole lot of commands that would end in nothing changed */
00628   Vehicle *w = v;
00629   bool any_replacements = false;
00630   while (w != NULL && !any_replacements) {
00631     any_replacements = (GetNewEngineType(w, c) != INVALID_ENGINE);
00632     w = (!free_wagon && w->type == VEH_TRAIN ? GetNextUnit(w) : NULL);
00633   }
00634 
00635   if (any_replacements) {
00636     bool was_stopped = free_wagon || ((v->vehstatus & VS_STOPPED) != 0);
00637 
00638     /* Stop the vehicle */
00639     if (!was_stopped) cost.AddCost(StartStopVehicle(v, true));
00640     if (cost.Failed()) return cost;
00641 
00642     assert(v->IsStoppedInDepot());
00643 
00644     /* We have to construct the new vehicle chain to test whether it is valid.
00645      * Vehicle construction needs random bits, so we have to save the random seeds
00646      * to prevent desyncs and to replay newgrf callbacks during DC_EXEC */
00647     SavedRandomSeeds saved_seeds;
00648     SaveRandomSeeds(&saved_seeds);
00649     if (free_wagon) {
00650       cost.AddCost(ReplaceFreeUnit(&v, flags & ~DC_EXEC, &nothing_to_do));
00651     } else {
00652       cost.AddCost(ReplaceChain(&v, flags & ~DC_EXEC, wagon_removal, &nothing_to_do));
00653     }
00654     RestoreRandomSeeds(saved_seeds);
00655 
00656     if (cost.Succeeded() && (flags & DC_EXEC) != 0) {
00657       CommandCost ret;
00658       if (free_wagon) {
00659         ret = ReplaceFreeUnit(&v, flags, &nothing_to_do);
00660       } else {
00661         ret = ReplaceChain(&v, flags, wagon_removal, &nothing_to_do);
00662       }
00663       assert(ret.Succeeded() && ret.GetCost() == cost.GetCost());
00664     }
00665 
00666     /* Restart the vehicle */
00667     if (!was_stopped) cost.AddCost(StartStopVehicle(v, false));
00668   }
00669 
00670   if (cost.Succeeded() && nothing_to_do) cost = CommandCost(STR_AUTOREPLACE_NOTHING_TO_DO);
00671   return cost;
00672 }

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