Function CmdBuildIndustry

src/industry_cmd.cpp:2064–2147

* Build/Fund an industry * @param flags of operations to conduct * @param tile tile where industry is built * @param it industry type see build_industry.h and see industry.h * @param first_layout first layout to try * @param fund false = prospect, true = fund (only valid if current company is DEITY) * @param seed seed to use for desyncfree randomisations * @return the cost of this operation

 * @return the cost of this operation or an error
 */
CommandCost CmdBuildIndustry(DoCommandFlags flags, TileIndex tile, IndustryType it, uint32_t first_layout, bool fund, uint32_t seed)
{
	if (it >= NUM_INDUSTRYTYPES) return CMD_ERROR;

	const IndustrySpec *indspec = GetIndustrySpec(it);

	/* Check if the to-be built/founded industry is available for this climate. */
	if (!indspec->enabled || indspec->layouts.empty()) return CMD_ERROR;

	/* If the setting for raw-material industries is not on, you cannot build raw-material industries.
	 * Raw material industries are industries that do not accept cargo (at least for now) */
	if (_game_mode != GM_EDITOR && _current_company != OWNER_DEITY && _settings_game.construction.raw_industry_construction == 0 && indspec->IsRawIndustry()) {
		return CMD_ERROR;
	}

	if (_game_mode != GM_EDITOR && GetIndustryProbabilityCallback(it, _current_company == OWNER_DEITY ? IACT_RANDOMCREATION : IACT_USERCREATION, 1) == 0) {
		return CMD_ERROR;
	}

	Randomizer randomizer;
	randomizer.SetSeed(seed);
	uint16_t random_initial_bits = GB(seed, 0, 16);
	uint32_t random_var8f = randomizer.Next();
	size_t num_layouts = indspec->layouts.size();
	CommandCost ret = CommandCost(STR_ERROR_SITE_UNSUITABLE);
	const bool deity_prospect = _current_company == OWNER_DEITY && !fund;

	Industry *ind = nullptr;
	if (deity_prospect || (_game_mode != GM_EDITOR && _current_company != OWNER_DEITY && _settings_game.construction.raw_industry_construction == 2 && indspec->IsRawIndustry())) {
		if (flags.Test(DoCommandFlag::Execute)) {
			/* Prospecting has a chance to fail, however we cannot guarantee that something can
			 * be built on the map, so the chance gets lower when the map is fuller, but there
			 * is nothing we can really do about that. */
			bool prospect_success = deity_prospect || Random() <= indspec->prospecting_chance;
			if (prospect_success) {
				/* Prospected industries are build as OWNER_TOWN to not e.g. be build on owned land of the founder */
				IndustryAvailabilityCallType calltype = _current_company == OWNER_DEITY ? IACT_RANDOMCREATION : IACT_PROSPECTCREATION;
				Backup<CompanyID> cur_company(_current_company, OWNER_TOWN);
				for (int i = 0; i < 5000; i++) {
					/* We should not have more than one Random() in a function call
					 * because parameter evaluation order is not guaranteed in the c++ standard
					 */
					tile = RandomTile();
					/* Start with a random layout */
					size_t layout = RandomRange((uint32_t)num_layouts);
					/* Check now each layout, starting with the random one */
					for (size_t j = 0; j < num_layouts; j++) {
						layout = (layout + 1) % num_layouts;
						ret = CreateNewIndustryHelper(tile, it, flags, indspec, layout, random_var8f, random_initial_bits, cur_company.GetOriginalValue(), calltype, &ind);
						if (ret.Succeeded()) break;
					}
					if (ret.Succeeded()) break;
				}
				cur_company.Restore();
			}
			if (ret.Failed() && IsLocalCompany()) {
				if (prospect_success) {
					ShowErrorMessage(GetEncodedString(STR_ERROR_CAN_T_PROSPECT_INDUSTRY), GetEncodedString(STR_ERROR_NO_SUITABLE_PLACES_FOR_PROSPECTING), WL_INFO);