/* $Id$ */

/*
 * 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 company_base.h Definition of stuff that is very close to a company, like the company struct itself. */

#ifndef COMPANY_BASE_H
#define COMPANY_BASE_H

#include "core/pool_type.hpp"
#include "road_type.h"
#include "rail_type.h"
#include "livery.h"
#include "autoreplace_type.h"
#include "economy_type.h"
#include "tile_type.h"
#include "settings_type.h"

struct CompanyEconomyEntry {
	Money income;
	Money expenses;
	int32 delivered_cargo;
	int32 performance_history; ///< company score (scale 0-1000)
	Money company_value;
};

typedef Pool<Company, CompanyByte, 1, MAX_COMPANIES> CompanyPool;
extern CompanyPool _company_pool;


/** Statically loadable part of Company pool item */
struct CompanyProperties {
	uint32 name_2;                   ///< Parameter of #name_1.
	uint16 name_1;                   ///< Name of the company if the user did not change it.
	char *name;                      ///< Name of the company if the user changed it.

	uint16 president_name_1;         ///< Name of the president if the user did not change it.
	uint32 president_name_2;         ///< Parameter of #president_name_1
	char *president_name;            ///< Name of the president if the user changed it.

	CompanyManagerFace face;         ///< Face description of the president.

	Money money;                     ///< Money owned by the company.
	byte money_fraction;             ///< Fraction of money of the company, too small to represent in #money.
	Money current_loan;              ///< Amount of money borrowed from the bank.

	byte colour;                     ///< Company colour.

	RailTypes avail_railtypes;       ///< Rail types available to the company.

	byte block_preview;              ///< Number of quarters that the company is not allowed to get new exclusive engine previews (see CompaniesGenStatistics).

	uint32 cargo_types;              ///< Which cargo types were transported the last year.

	TileIndex location_of_HQ;        ///< Northern tile of HQ; #INVALID_TILE when there is none.
	TileIndex last_build_coordinate; ///< Coordinate of the last build thing by this company.

	OwnerByte share_owners[4];       ///< Owners of the 4 shares of the company. #INVALID_OWNER if nobody has bought them yet.

	Year inaugurated_year;           ///< Year of starting the company.

	byte quarters_of_bankruptcy;     ///< Number of quarters (a quarter is 3 months) that the company has a negative balance.
	CompanyMask bankrupt_asked;      ///< which companies were asked about buying it?
	int16 bankrupt_timeout;          ///< If bigger than \c 0, amount of time to wait for an answer on an offer to buy this company.
	Money bankrupt_value;

	uint32 terraform_limit;          ///< Amount of tileheights we can (still) terraform (times 65536).
	uint32 clear_limit;              ///< Amount of tiles we can (still) clear (times 65536).

	/**
	 * If \c true, the company is (also) controlled by the computer (a NoAI program).
	 * @note It is possible that the user is also participating in such a company.
	 */
	bool is_ai;

	Money yearly_expenses[3][EXPENSES_END];                ///< Expenses of the company for the last three years, in every #Expenses category.
	CompanyEconomyEntry cur_economy;                       ///< Economic data of the company of this quarter.
	CompanyEconomyEntry old_economy[MAX_HISTORY_QUARTERS]; ///< Economic data of the company of the last #MAX_HISTORY_QUARTERS quarters.
	byte num_valid_stat_ent;                               ///< Number of valid statistical entries in #old_economy.

	CompanyProperties() : name(NULL), president_name(NULL) {}

	~CompanyProperties()
	{
		free(this->name);
		free(this->president_name);
	}
};

struct Company : CompanyPool::PoolItem<&_company_pool>, CompanyProperties {
	Company(uint16 name_1 = 0, bool is_ai = false);
	~Company();

	Livery livery[LS_END];
	RoadTypes avail_roadtypes;         ///< Road types available to this company.

	class AIInstance *ai_instance;
	class AIInfo *ai_info;

	EngineRenewList engine_renew_list; ///< Engine renewals of this company.
	CompanySettings settings;          ///< settings specific for each company
	uint16 *num_engines;               ///< caches the number of engines of each type the company owns (no need to save this)

	/**
	 * Is this company a valid company, controlled by the computer (a NoAI program)?
	 * @param index Index in the pool.
	 * @return \c true if it is a valid, computer controlled company, else \c false.
	 */
	static FORCEINLINE bool IsValidAiID(size_t index)
	{
		const Company *c = Company::GetIfValid(index);
		return c != NULL && c->is_ai;
	}

	/**
	 * Is this company a valid company, not controlled by a NoAI program?
	 * @param index Index in the pool.
	 * @return \c true if it is a valid, human controlled company, else \c false.
	 * @note If you know that \a index refers to a valid company, you can use #IsHumanID() instead.
	 */
	static FORCEINLINE bool IsValidHumanID(size_t index)
	{
		const Company *c = Company::GetIfValid(index);
		return c != NULL && !c->is_ai;
	}

	/**
	 * Is this company a company not controlled by a NoAI program?
	 * @param index Index in the pool.
	 * @return \c true if it is a human controlled company, else \c false.
	 * @pre \a index must be a valid CompanyID.
	 * @note If you don't know whether \a index refers to a valid company, you should use #IsValidHumanID() instead.
	 */
	static FORCEINLINE bool IsHumanID(size_t index)
	{
		return !Company::Get(index)->is_ai;
	}

	static void PostDestructor(size_t index);
};

#define FOR_ALL_COMPANIES_FROM(var, start) FOR_ALL_ITEMS_FROM(Company, company_index, var, start)
#define FOR_ALL_COMPANIES(var) FOR_ALL_COMPANIES_FROM(var, 0)

Money CalculateCompanyValue(const Company *c, bool including_loan = true);

extern uint _next_competitor_start;
extern uint _cur_company_tick_index;

#endif /* COMPANY_BASE_H */