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/* $Id$ */

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/** @file cargopacket.cpp Implementation of the cargo packets */

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#include "stdafx.h"

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#include "openttd.h"

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#include "station_base.h"

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#include "cargopacket.h"

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#include "saveload.h"

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/* Initialize the cargopacket-pool */

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DEFINE_OLD_POOL_GENERIC(CargoPacket, CargoPacket)

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void InitializeCargoPackets()

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{

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	/* Clean the cargo packet pool and create 1 block in it */

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	_CargoPacket_pool.CleanPool();

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	_CargoPacket_pool.AddBlockToPool();

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}

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CargoPacket::CargoPacket(StationID source, uint16 count)

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{

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	if (source != INVALID_STATION) assert(count != 0);

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	this->source          = source;

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	this->source_xy       = (source != INVALID_STATION) ? GetStation(source)->xy : 0;

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	this->loaded_at_xy    = this->source_xy;

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	this->count           = count;

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	this->days_in_transit = 0;

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	this->feeder_share    = 0;

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	this->paid_for        = false;

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}

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CargoPacket::~CargoPacket()

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{

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	this->count = 0;

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}

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bool CargoPacket::SameSource(const CargoPacket *cp) const

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{

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	return this->source_xy == cp->source_xy && this->days_in_transit == cp->days_in_transit && this->paid_for == cp->paid_for;

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}

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static const SaveLoad _cargopacket_desc[] = {

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	SLE_VAR(CargoPacket, source,          SLE_UINT16),

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	SLE_VAR(CargoPacket, source_xy,       SLE_UINT32),

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	SLE_VAR(CargoPacket, loaded_at_xy,    SLE_UINT32),

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	SLE_VAR(CargoPacket, count,           SLE_UINT16),

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	SLE_VAR(CargoPacket, days_in_transit, SLE_UINT8),

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	SLE_VAR(CargoPacket, feeder_share,    SLE_INT64),

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	SLE_VAR(CargoPacket, paid_for,        SLE_BOOL),

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	SLE_END()

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};

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static void Save_CAPA()

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{

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	CargoPacket *cp;

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	FOR_ALL_CARGOPACKETS(cp) {

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		SlSetArrayIndex(cp->index);

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		SlObject(cp, _cargopacket_desc);

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	}

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}

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static void Load_CAPA()

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{

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	int index;

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	while ((index = SlIterateArray()) != -1) {

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		CargoPacket *cp = new (index) CargoPacket();

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		SlObject(cp, _cargopacket_desc);

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	}

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}

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extern const ChunkHandler _cargopacket_chunk_handlers[] = {

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	{ 'CAPA', Save_CAPA, Load_CAPA, CH_ARRAY | CH_LAST},

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};

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/*

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 *

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 * Cargo list implementation

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 *

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 */

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CargoList::~CargoList()

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{

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	while (!packets.empty()) {

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		delete packets.front();

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		packets.pop_front();

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	}

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}

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const CargoList::List *CargoList::Packets() const

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{

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	return &packets;

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}

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void CargoList::AgeCargo()

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{

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	if (empty) return;

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	uint dit = 0;

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	for (List::const_iterator it = packets.begin(); it != packets.end(); it++) {

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		if ((*it)->days_in_transit != 0xFF) (*it)->days_in_transit++;

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		dit += (*it)->days_in_transit * (*it)->count;

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	}

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	days_in_transit = dit / count;

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}

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bool CargoList::Empty() const

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{

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	return empty;

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}

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uint CargoList::Count() const

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{

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	return count;

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}

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bool CargoList::UnpaidCargo() const

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{

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	return unpaid_cargo;

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}

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Money CargoList::FeederShare() const

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{

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	return feeder_share;

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}

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StationID CargoList::Source() const

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{

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	return source;

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}

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uint CargoList::DaysInTransit() const

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{

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	return days_in_transit;

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}

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void CargoList::Append(CargoPacket *cp)

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{

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	assert(cp != NULL);

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	assert(cp->IsValid());

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	for (List::iterator it = packets.begin(); it != packets.end(); it++) {

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		if ((*it)->SameSource(cp) && (*it)->count + cp->count <= 65535) {

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			(*it)->count        += cp->count;

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			(*it)->feeder_share += cp->feeder_share;

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			delete cp;

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			InvalidateCache();

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			return;

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		}

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	}

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	/* The packet could not be merged with another one */

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	packets.push_back(cp);

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	InvalidateCache();

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}

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void CargoList::Truncate(uint count)

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{

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	for (List::iterator it = packets.begin(); it != packets.end(); it++) {

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		uint local_count = (*it)->count;

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		if (local_count <= count) {

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			count -= local_count;

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			continue;

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		}

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		(*it)->count = count;

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		count = 0;

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	}

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	while (!packets.empty()) {

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		CargoPacket *cp = packets.back();

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		if (cp->count != 0) break;

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		delete cp;

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		packets.pop_back();

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	}

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	InvalidateCache();

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}

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bool CargoList::MoveTo(CargoList *dest, uint count, CargoList::MoveToAction mta, uint data)

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{

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	assert(mta == MTA_FINAL_DELIVERY || dest != NULL);

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	CargoList tmp;

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	while (!packets.empty() && count > 0) {

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		CargoPacket *cp = *packets.begin();

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		if (cp->count <= count) {

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			/* Can move the complete packet */

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			packets.remove(cp);

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			switch (mta) {

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				case MTA_FINAL_DELIVERY:

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					if (cp->source == data) {

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						tmp.Append(cp);

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					} else {

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						count -= cp->count;

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						delete cp;

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					}

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					break;

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				case MTA_CARGO_LOAD:

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					cp->loaded_at_xy = data;

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					/* When cargo is moved into another vehicle you have *always* paid for it */

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					cp->paid_for     = false;

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					/* FALL THROUGH */

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				case MTA_OTHER:

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					count -= cp->count;

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					dest->packets.push_back(cp);

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					break;

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			}

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		} else {

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			/* Can move only part of the packet, so split it into two pieces */

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			if (mta != MTA_FINAL_DELIVERY) {

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				CargoPacket *cp_new = new CargoPacket();

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				cp_new->source          = cp->source;

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				cp_new->source_xy       = cp->source_xy;

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				cp_new->loaded_at_xy    = (mta == MTA_CARGO_LOAD) ? data : cp->loaded_at_xy;

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				cp_new->days_in_transit = cp->days_in_transit;

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				cp_new->feeder_share    = cp->feeder_share / count;

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				/* When cargo is moved into another vehicle you have *always* paid for it */

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				cp_new->paid_for        = (mta == MTA_CARGO_LOAD) ? false : cp->paid_for;

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				cp_new->count = count;

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				dest->packets.push_back(cp_new);

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				cp->feeder_share /= cp->count - count;

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			}

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			cp->count -= count;

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			count = 0;

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		}

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	}

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	bool remaining = !packets.empty();

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	if (mta == MTA_FINAL_DELIVERY && !tmp.Empty()) {

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		/* There are some packets that could not be delivered at the station, put them back */

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		tmp.MoveTo(this, MAX_UVALUE(uint));

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		tmp.packets.clear();

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	}

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	if (dest != NULL) dest->InvalidateCache();

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	InvalidateCache();

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	return remaining;

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}

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void CargoList::InvalidateCache()

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{

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	empty = packets.empty();

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	count = 0;

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	unpaid_cargo = false;

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	feeder_share = 0;

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	source = INVALID_STATION;

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	days_in_transit = 0;

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	if (empty) return;

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	uint dit = 0;

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	for (List::const_iterator it = packets.begin(); it != packets.end(); it++) {

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		count        += (*it)->count;

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		unpaid_cargo |= !(*it)->paid_for;

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		dit          += (*it)->days_in_transit * (*it)->count;

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		feeder_share += (*it)->feeder_share;

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	}

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	days_in_transit = dit / count;

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	source = (*packets.begin())->source;

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}