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/* $Id$ */

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/** @file timetable_cmd.cpp Commands related to time tabling. */

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#include "stdafx.h"

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#include "openttd.h"

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#include "variables.h"

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#include "command_func.h"

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#include "functions.h"

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#include "window_func.h"

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#include "vehicle_func.h"

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#include "vehicle_base.h"

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#include "settings_type.h"

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#include "table/strings.h"

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static void ChangeTimetable(Vehicle *v, VehicleOrderID order_number, uint16 time, bool is_journey)

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{

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	Order *order = GetVehicleOrder(v, order_number);

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	if (is_journey) {

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		order->travel_time = time;

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	} else {

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		order->wait_time = time;

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	}

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	for (v = v->FirstShared(); v != NULL; v = v->NextShared()) {

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		if (v->cur_order_index == order_number && v->current_order.Equals(*order)) {

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			if (is_journey) {

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				v->current_order.travel_time = time;

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			} else {

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				v->current_order.wait_time = time;

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			}

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		}

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		InvalidateWindow(WC_VEHICLE_TIMETABLE, v->index);

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	}

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}

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/**

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 * Add or remove waiting times from an order.

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 * @param tile Not used.

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 * @param flags Operation to perform.

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 * @param p1 Various bitstuffed elements

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 * - p1 = (bit  0-15) - Vehicle with the orders to change.

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 * - p1 = (bit 16-23) - Order index to modify.

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 * - p1 = (bit    24) - Whether to change the waiting time or the travelling

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 *                      time.

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 * - p1 = (bit    25) - Whether p2 contains waiting and travelling time.

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 * @param p2 The amount of time to wait.

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 * - p2 = (bit  0-15) - Waiting or travelling time as specified by p1 bit 24 if p1 bit 25 is not set,

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 *                      Travelling time if p1 bit 25 is set.

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 * - p2 = (bit 16-31) - Waiting time if p1 bit 25 is set

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 */

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CommandCost CmdChangeTimetable(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)

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{

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	if (!_settings_game.order.timetabling) return CMD_ERROR;

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	VehicleID veh = GB(p1, 0, 16);

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	if (!IsValidVehicleID(veh)) return CMD_ERROR;

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	Vehicle *v = GetVehicle(veh);

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	if (!CheckOwnership(v->owner)) return CMD_ERROR;

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	VehicleOrderID order_number = GB(p1, 16, 8);

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	Order *order = GetVehicleOrder(v, order_number);

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	if (order == NULL) return CMD_ERROR;

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	bool packed_time = HasBit(p1, 25);

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	bool is_journey = HasBit(p1, 24) || packed_time;

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	int wait_time   = order->wait_time;

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	int travel_time = order->travel_time;

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	if (packed_time) {

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		travel_time = GB(p2, 0, 16);

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		wait_time   = GB(p2, 16, 16);;

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	} else if (is_journey) {

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		travel_time = GB(p2, 0, 16);

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	} else {

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		wait_time   = GB(p2, 0, 16);

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	}

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	if (wait_time != order->wait_time) {

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		switch (order->GetType()) {

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			case OT_GOTO_STATION:

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				if (order->GetNonStopType() & ONSF_NO_STOP_AT_DESTINATION_STATION) return_cmd_error(STR_TIMETABLE_NOT_STOPPING_HERE);

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				break;

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			case OT_CONDITIONAL:

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				break;

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			default: return_cmd_error(STR_TIMETABLE_ONLY_WAIT_AT_STATIONS);

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		}

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	}

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	if (travel_time != order->travel_time && order->IsType(OT_CONDITIONAL)) return CMD_ERROR;

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	if (flags & DC_EXEC) {

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		if (wait_time   != order->wait_time)   ChangeTimetable(v, order_number, wait_time,   false);

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		if (travel_time != order->travel_time) ChangeTimetable(v, order_number, travel_time, true);

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	}

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	return CommandCost();

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}

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/**

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 * Clear the lateness counter to make the vehicle on time.

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 * @param tile Not used.

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 * @param flags Operation to perform.

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 * @param p1 Various bitstuffed elements

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 * - p1 = (bit  0-15) - Vehicle with the orders to change.

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 */

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CommandCost CmdSetVehicleOnTime(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)

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{

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	if (!_settings_game.order.timetabling) return CMD_ERROR;

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	VehicleID veh = GB(p1, 0, 16);

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	if (!IsValidVehicleID(veh)) return CMD_ERROR;

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	Vehicle *v = GetVehicle(veh);

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	if (!CheckOwnership(v->owner)) return CMD_ERROR;

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	if (flags & DC_EXEC) {

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		v->lateness_counter = 0;

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	}

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	return CommandCost();

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}

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/**

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 * Start or stop filling the timetable automatically from the time the vehicle

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 * actually takes to complete it. When starting to autofill the current times

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 * are cleared and the timetable will start again from scratch.

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 * @param tile Not used.

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 * @param flags Operation to perform.

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 * @param p1 Vehicle index.

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 * @param p2 Set to 1 to enable, 0 to disable.

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 */

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CommandCost CmdAutofillTimetable(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)

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{

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	if (!_settings_game.order.timetabling) return CMD_ERROR;

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	VehicleID veh = GB(p1, 0, 16);

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	if (!IsValidVehicleID(veh)) return CMD_ERROR;

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	Vehicle *v = GetVehicle(veh);

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	if (!CheckOwnership(v->owner)) return CMD_ERROR;

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	if (flags & DC_EXEC) {

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		if (p2 == 1) {

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			/* Start autofilling the timetable, which clears all the current

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			 * timings and clears the "timetable has started" bit. */

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			SetBit(v->vehicle_flags, VF_AUTOFILL_TIMETABLE);

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			ClrBit(v->vehicle_flags, VF_TIMETABLE_STARTED);

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			for (Order *order = GetVehicleOrder(v, 0); order != NULL; order = order->next) {

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				order->wait_time = 0;

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				order->travel_time = 0;

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			}

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			v->current_order.wait_time = 0;

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			v->current_order.travel_time = 0;

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		} else {

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			ClrBit(v->vehicle_flags, VF_AUTOFILL_TIMETABLE);

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		}

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	}

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	for (v = v->FirstShared(); v != NULL; v = v->NextShared()) {

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		InvalidateWindow(WC_VEHICLE_TIMETABLE, v->index);

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	}

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	return CommandCost();

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}

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void UpdateVehicleTimetable(Vehicle *v, bool travelling)

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{

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	uint timetabled = travelling ? v->current_order.travel_time : v->current_order.wait_time;

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	uint time_taken = v->current_order_time;

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	v->current_order_time = 0;

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	if (!_settings_game.order.timetabling) return;

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	/* Make sure the timetable only starts when the vehicle reaches the first

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	 * order, not when travelling from the depot to the first station. */

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	if (v->cur_order_index == 0 && !HasBit(v->vehicle_flags, VF_TIMETABLE_STARTED)) {

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		SetBit(v->vehicle_flags, VF_TIMETABLE_STARTED);

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		return;

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	}

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	if (!HasBit(v->vehicle_flags, VF_TIMETABLE_STARTED)) return;

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	if (HasBit(v->vehicle_flags, VF_AUTOFILL_TIMETABLE)) {

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		if (timetabled == 0) {

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			/* Round the time taken up to the nearest day, as this will avoid

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			 * confusion for people who are timetabling in days, and can be

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			 * adjusted later by people who aren't. */

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			time_taken = (((time_taken - 1) / DAY_TICKS) + 1) * DAY_TICKS;

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			if (!v->current_order.IsType(OT_CONDITIONAL)) {

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				ChangeTimetable(v, v->cur_order_index, time_taken, travelling);

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			}

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			return;

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		} else if (v->cur_order_index == 0) {

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			/* Otherwise if we're at the beginning and it already has a value,

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			 * assume that autofill is finished and turn it off again. */

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			ClrBit(v->vehicle_flags, VF_AUTOFILL_TIMETABLE);

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		}

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	}

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	/* Vehicles will wait at stations if they arrive early even if they are not

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	 * timetabled to wait there, so make sure the lateness counter is updated

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	 * when this happens. */

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	if (timetabled == 0 && (travelling || v->lateness_counter >= 0)) return;

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	v->lateness_counter -= (timetabled - time_taken);

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	for (v = v->FirstShared(); v != NULL; v = v->NextShared()) {

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		InvalidateWindow(WC_VEHICLE_TIMETABLE, v->index);

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	}

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}