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/* $Id$ */

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/** @file ai_airport.cpp Implementation of AIAirport. */

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#include "ai_airport.hpp"

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#include "ai_error.hpp"

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#include "../../openttd.h"

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#include "../../variables.h"

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#include "../../station_map.h"

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#include "../../player_func.h"

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#include "../../settings_type.h"

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/* static */ bool AIAirport::IsHangarTile(TileIndex tile)

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{

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	if (!::IsValidTile(tile)) return false;

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	return ::IsTileType(tile, MP_STATION) && ::IsHangar(tile);

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}

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/* static */ bool AIAirport::IsAirportTile(TileIndex tile)

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{

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	if (!::IsValidTile(tile)) return false;

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	return ::IsTileType(tile, MP_STATION) && ::IsAirport(tile);

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}

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/* static */ bool AIAirport::AirportAvailable(AirportType type)

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{

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	if (type > AT_HELISTATION) return false;

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	return HasBit(::GetValidAirports(), type);

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}

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/* static */ int32 AIAirport::GetAirportWidth(AirportType type)

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{

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	if (type > AT_HELISTATION) return -1;

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	return ::GetAirport(type)->size_x;

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}

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/* static */ int32 AIAirport::GetAirportHeight(AirportType type)

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{

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	if (type > AT_HELISTATION) return -1;

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	return ::GetAirport(type)->size_y;

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}

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/* static */ int32 AIAirport::GetAirportCoverageRadius(AirportType type)

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{

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	if (type > AT_HELISTATION) return -1;

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	return _patches.modified_catchment ? ::GetAirport(type)->catchment : (uint)CA_UNMODIFIED;

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}

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/* static */ bool AIAirport::BuildAirport(TileIndex tile, AirportType type)

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{

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	EnforcePrecondition(false, ::IsValidTile(tile));

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	EnforcePrecondition(false, type <= AT_HELISTATION);

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	return AIObject::DoCommand(tile, type, 0, CMD_BUILD_AIRPORT);

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}

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/* static */ bool AIAirport::RemoveAirport(TileIndex tile)

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{

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	EnforcePrecondition(false, ::IsValidTile(tile))

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	EnforcePrecondition(false, IsAirportTile(tile) || IsHangarTile(tile));

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	return AIObject::DoCommand(tile, 0, 0, CMD_LANDSCAPE_CLEAR);

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}

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/* static */ TileIndex AIAirport::GetHangarOfAirport(TileIndex tile)

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{

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	if (!::IsTileType(tile, MP_STATION)) return INVALID_TILE;

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	const Station *st = ::GetStationByTile(tile);

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	if (st->owner != _current_player) return INVALID_TILE;

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	return ::ToTileIndexDiff(st->Airport()->airport_depots[0]) + st->xy;

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}