/* $Id$ */

/** @file ai_company.cpp Implementation of AICompany. */

#include "ai_company.hpp"
#include "ai_error.hpp"
#include "ai_log.hpp"
#include "../../openttd.h"
#include "../../command_func.h"
#include "../../company_func.h"
#include "../../company_base.h"
#include "../../economy_func.h"
#include "../../strings_func.h"
#include "../../tile_map.h"
#include "../../variables.h"
#include "../../core/alloc_func.hpp"
#include "../../string_func.h"
#include "table/strings.h"

/* static */ AICompany::CompanyID AICompany::ResolveCompanyID(AICompany::CompanyID company)
{
	if (company == MY_COMPANY) return (CompanyID)((byte)_current_company);

	return ::IsValidCompanyID((::CompanyID)company) ? company : INVALID_COMPANY;
}

/* static */ bool AICompany::IsMine(AICompany::CompanyID company)
{
	return ResolveCompanyID(company) == ResolveCompanyID(MY_COMPANY);
}

/* static */ bool AICompany::SetCompanyName(const char *name)
{
	AILog::Error("AICompany::SetCompanyName is obsolete. Use AICompany::SetName instead.");
	return AICompany::SetName(name);
}

/* static */ bool AICompany::SetName(const char *name)
{
	EnforcePrecondition(false, !::StrEmpty(name));
	EnforcePreconditionCustomError(false, ::strlen(name) < MAX_LENGTH_COMPANY_NAME_BYTES, AIError::ERR_PRECONDITION_STRING_TOO_LONG);

	return AIObject::DoCommand(0, 0, 0, CMD_RENAME_COMPANY, name);
}

/* static */ const char *AICompany::GetCompanyName(AICompany::CompanyID company)
{
	AILog::Error("AICompany::GetCompanyName is obsolete. Use AICompany::GetName instead.");
	return AICompany::GetName(company);
}

/* static */ const char *AICompany::GetName(AICompany::CompanyID company)
{
	company = ResolveCompanyID(company);
	if (company == INVALID_COMPANY) return NULL;

	static const int len = 64;
	char *company_name = MallocT<char>(len);

	::SetDParam(0, company);
	::GetString(company_name, STR_COMPANY_NAME, &company_name[len - 1]);
	return company_name;
}

/* static */ bool AICompany::SetPresidentName(const char *name)
{
	EnforcePrecondition(false, !::StrEmpty(name));

	return AIObject::DoCommand(0, 0, 0, CMD_RENAME_PRESIDENT, name);
}

/* static */ const char *AICompany::GetPresidentName(AICompany::CompanyID company)
{
	company = ResolveCompanyID(company);

	static const int len = 64;
	char *president_name = MallocT<char>(len);
	if (company != INVALID_COMPANY) {
		::SetDParam(0, company);
		::GetString(president_name, STR_PRESIDENT_NAME, &president_name[len - 1]);
	} else {
		*president_name = '\0';
	}

	return president_name;
}

/* static */ Money AICompany::GetCompanyValue(AICompany::CompanyID company)
{
	company = ResolveCompanyID(company);
	if (company == INVALID_COMPANY) return -1;

	return ::CalculateCompanyValue(::GetCompany((CompanyID)company));
}

/* static */ Money AICompany::GetBankBalance(AICompany::CompanyID company)
{
	company = ResolveCompanyID(company);
	if (company == INVALID_COMPANY) return -1;

	return ::GetCompany((CompanyID)company)->money;
}

/* static */ Money AICompany::GetLoanAmount()
{
	return ::GetCompany(_current_company)->current_loan;
}

/* static */ Money AICompany::GetMaxLoanAmount()
{
	return _economy.max_loan;
}

/* static */ Money AICompany::GetLoanInterval()
{
	return LOAN_INTERVAL;
}

/* static */ bool AICompany::SetLoanAmount(int32 loan)
{
	EnforcePrecondition(false, loan >= 0);
	EnforcePrecondition(false, (loan % GetLoanInterval()) == 0);
	EnforcePrecondition(false, loan <= GetMaxLoanAmount());
	EnforcePrecondition(false, (loan - GetLoanAmount() + GetBankBalance(MY_COMPANY)) >= 0);

	if (loan == GetLoanAmount()) return true;

	return AIObject::DoCommand(0,
			abs(loan - GetLoanAmount()), 2,
			(loan > GetLoanAmount()) ? CMD_INCREASE_LOAN : CMD_DECREASE_LOAN);
}

/* static */ bool AICompany::SetMinimumLoanAmount(int32 loan)
{
	EnforcePrecondition(false, loan >= 0);

	int32 over_interval = loan % GetLoanInterval();
	if (over_interval != 0) loan += GetLoanInterval() - over_interval;

	EnforcePrecondition(false, loan <= GetMaxLoanAmount());

	SetLoanAmount(loan);

	return GetLoanAmount() == loan;
}

/* static */ bool AICompany::BuildCompanyHQ(TileIndex tile)
{
	EnforcePrecondition(false, ::IsValidTile(tile));

	return AIObject::DoCommand(tile, 0, 0, CMD_BUILD_COMPANY_HQ);
}

/* static */ TileIndex AICompany::GetCompanyHQ(CompanyID company)
{
	company = ResolveCompanyID(company);
	if (company == INVALID_COMPANY) return INVALID_TILE;

	TileIndex loc = ::GetCompany((CompanyID)company)->location_of_HQ;
	return (loc == 0) ? INVALID_TILE : loc;
}

/* static */ bool AICompany::SetAutoRenewStatus(bool autorenew)
{
	return AIObject::DoCommand(0, 0, autorenew ? 1 : 0, CMD_SET_AUTOREPLACE);
}

/* static */ bool AICompany::GetAutoRenewStatus(CompanyID company)
{
	company = ResolveCompanyID(company);
	if (company == INVALID_COMPANY) return false;

	return ::GetCompany((CompanyID)company)->engine_renew;
}

/* static */ bool AICompany::SetAutoRenewMonths(int16 months)
{
	return AIObject::DoCommand(0, 1, months, CMD_SET_AUTOREPLACE);
}

/* static */ int16 AICompany::GetAutoRenewMonths(CompanyID company)
{
	company = ResolveCompanyID(company);
	if (company == INVALID_COMPANY) return 0;

	return ::GetCompany((CompanyID)company)->engine_renew_months;
}

/* static */ bool AICompany::SetAutoRenewMoney(uint32 money)
{
	return AIObject::DoCommand(0, 2, money, CMD_SET_AUTOREPLACE);
}

/* static */ uint32 AICompany::GetAutoRenewMoney(CompanyID company)
{
	company = ResolveCompanyID(company);
	if (company == INVALID_COMPANY) return 0;

	return ::GetCompany((CompanyID)company)->engine_renew_money;
}