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Patric Stout

Fix #9281: acquire a company uses special bookkeeping to make you rich (#9300)

When you buy-out a company, you got your shares back. This is
based on company-value, which includes values for the vehicles etc.
In other words, you not only got the vehicles, but you also got
paid to get them back.

Additionally, you also got the loan of the company, but not the
money for the loan (as that is subtracted from the company-value).

Solve this by changing the rules of a buy-out: don't sell your
shares, get the loan AND the balance and get the infrastructure.

/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */

/** @file subsidy_base.h %Subsidy base class. */

#ifndef SUBSIDY_BASE_H
#define SUBSIDY_BASE_H

#include "cargo_type.h"
#include "company_type.h"
#include "subsidy_type.h"
#include "core/pool_type.hpp"

typedef Pool<Subsidy, SubsidyID, 1, 256> SubsidyPool;
extern SubsidyPool _subsidy_pool;

/** Struct about subsidies, offered and awarded */
struct Subsidy : SubsidyPool::PoolItem<&_subsidy_pool> {
	CargoID cargo_type;  ///< Cargo type involved in this subsidy, CT_INVALID for invalid subsidy
	byte remaining;      ///< Remaining months when this subsidy is valid
	CompanyID awarded;   ///< Subsidy is awarded to this company; INVALID_COMPANY if it's not awarded to anyone
	SourceType src_type; ///< Source of subsidised path (ST_INDUSTRY or ST_TOWN)
	SourceType dst_type; ///< Destination of subsidised path (ST_INDUSTRY or ST_TOWN)
	SourceID src;        ///< Index of source. Either TownID or IndustryID
	SourceID dst;        ///< Index of destination. Either TownID or IndustryID

	/**
	 * We need an (empty) constructor so struct isn't zeroed (as C++ standard states)
	 */
	inline Subsidy() { }

	/**
	 * (Empty) destructor has to be defined else operator delete might be called with nullptr parameter
	 */
	inline ~Subsidy() { }

	/**
	 * Tests whether this subsidy has been awarded to someone
	 * @return is this subsidy awarded?
	 */
	inline bool IsAwarded() const
	{
		return this->awarded != INVALID_COMPANY;
	}

	void AwardTo(CompanyID company);
};

/** Constants related to subsidies */
static const uint SUBSIDY_OFFER_MONTHS         =  12; ///< Duration of subsidy offer
static const uint SUBSIDY_CONTRACT_MONTHS      =  12; ///< Duration of subsidy after awarding
static const uint SUBSIDY_PAX_MIN_POPULATION   = 400; ///< Min. population of towns for subsidised pax route
static const uint SUBSIDY_CARGO_MIN_POPULATION = 900; ///< Min. population of destination town for cargo route
static const uint SUBSIDY_MAX_PCT_TRANSPORTED  =  42; ///< Subsidy will be created only for towns/industries with less % transported
static const uint SUBSIDY_MAX_DISTANCE         =  70; ///< Max. length of subsidised route (DistanceManhattan)
static const uint SUBSIDY_TOWN_CARGO_RADIUS    =   6; ///< Extent of a tile area around town center when scanning for town cargo acceptance and production (6 ~= min catchmement + min station / 2)

#endif /* SUBSIDY_BASE_H */