<?php
	class ReverseGeocode
	{
		protected $oDB;

		protected $fLat;
		protected $fLon;
		protected $iMaxRank = 28;

		protected $aLangPrefOrder = array();

		protected $bIncludePolygonAsPoints = false;
		protected $bIncludePolygonAsText = false;
		protected $bIncludePolygonAsGeoJSON = false;
		protected $bIncludePolygonAsKML = false;
		protected $bIncludePolygonAsSVG = false;
		protected $fPolygonSimplificationThreshold = 0.0;


		function ReverseGeocode(&$oDB)
		{
			$this->oDB =& $oDB;
		}

		function setLanguagePreference($aLangPref)
		{
			$this->aLangPrefOrder = $aLangPref;
		}

		function setLatLon($fLat, $fLon)
		{
			$this->fLat = (float)$fLat;
			$this->fLon = (float)$fLon;
		}

		function setRank($iRank)
		{
			$this->iMaxRank = $iRank;
		}

		function setZoom($iZoom)
		{
			// Zoom to rank, this could probably be calculated but a lookup gives fine control
			$aZoomRank = array(
				0 => 2, // Continent / Sea
				1 => 2,
				2 => 2,
				3 => 4, // Country
				4 => 4,
				5 => 8, // State
				6 => 10, // Region
				7 => 10,
				8 => 12, // County
				9 => 12,
				10 => 17, // City
				11 => 17,
				12 => 18, // Town / Village
				13 => 18,
				14 => 22, // Suburb
				15 => 22,
				16 => 26, // Street, TODO: major street?
				17 => 26,
				18 => 30, // or >, Building
				19 => 30, // or >, Building
				);
			$this->iMaxRank = (isset($iZoom) && isset($aZoomRank[$iZoom]))?$aZoomRank[$iZoom]:28;
		}

				function setIncludePolygonAsPoints($b = true)
		{
			$this->bIncludePolygonAsPoints = $b;
		}

		function getIncludePolygonAsPoints()
		{
			return $this->bIncludePolygonAsPoints;
		}

		function setIncludePolygonAsText($b = true)
		{
			$this->bIncludePolygonAsText = $b;
		}

		function getIncludePolygonAsText()
		{
			return $this->bIncludePolygonAsText;
		}

		function setIncludePolygonAsGeoJSON($b = true)
		{
			$this->bIncludePolygonAsGeoJSON = $b;
		}

		function setIncludePolygonAsKML($b = true)
		{
			$this->bIncludePolygonAsKML = $b;
		}

		function setIncludePolygonAsSVG($b = true)
		{
			$this->bIncludePolygonAsSVG = $b;
		}

		function setPolygonSimplificationThreshold($f)
		{
			$this->fPolygonSimplificationThreshold = $f;
		}

		// returns { place_id =>, type => '(osm|tiger)' }
		// fails if no place was found
		function lookup()
		{
			$sPointSQL = 'ST_SetSRID(ST_Point('.$this->fLon.','.$this->fLat.'),4326)';
			$iMaxRank = $this->iMaxRank;
			$iMaxRank_orig = $this->iMaxRank;

			// Find the nearest point
			$fSearchDiam = 0.0004;
			$iPlaceID = null;
			$aArea = false;
			$fMaxAreaDistance = 1;
			$bIsInUnitedStates = false;
			$bPlaceIsTiger = false;
			$bPlaceIsLine = false;
			while(!$iPlaceID && $fSearchDiam < $fMaxAreaDistance)
			{
				$fSearchDiam = $fSearchDiam * 2;

				// If we have to expand the search area by a large amount then we need a larger feature
				// then there is a limit to how small the feature should be
				if ($fSearchDiam > 2 && $iMaxRank > 4) $iMaxRank = 4;
				if ($fSearchDiam > 1 && $iMaxRank > 9) $iMaxRank = 8;
				if ($fSearchDiam > 0.8 && $iMaxRank > 10) $iMaxRank = 10;
				if ($fSearchDiam > 0.6 && $iMaxRank > 12) $iMaxRank = 12;
				if ($fSearchDiam > 0.2 && $iMaxRank > 17) $iMaxRank = 17;
				if ($fSearchDiam > 0.1 && $iMaxRank > 18) $iMaxRank = 18;
				if ($fSearchDiam > 0.008 && $iMaxRank > 22) $iMaxRank = 22;
				if ($fSearchDiam > 0.001 && $iMaxRank > 26) $iMaxRank = 26;

				$sSQL = 'select place_id,parent_place_id,rank_search,calculated_country_code';
				$sSQL .= ' FROM placex';
				$sSQL .= ' WHERE ST_DWithin('.$sPointSQL.', geometry, '.$fSearchDiam.')';
				$sSQL .= ' and rank_search != 28 and rank_search >= '.$iMaxRank;
				$sSQL .= ' and (name is not null or housenumber is not null)';
				$sSQL .= ' and class not in (\'waterway\',\'railway\',\'tunnel\',\'bridge\',\'man_made\')';
				$sSQL .= ' and indexed_status = 0 ';
				$sSQL .= ' and (ST_GeometryType(geometry) not in (\'ST_Polygon\',\'ST_MultiPolygon\') ';
				$sSQL .= ' OR ST_DWithin('.$sPointSQL.', centroid, '.$fSearchDiam.'))';
				$sSQL .= ' ORDER BY ST_distance('.$sPointSQL.', geometry) ASC limit 1';
				if (CONST_Debug) var_dump($sSQL);
				$aPlace = chksql($this->oDB->getRow($sSQL),
				                 "Could not determine closest place.");
				$iPlaceID = $aPlace['place_id'];
				$iParentPlaceID = $aPlace['parent_place_id'];
				$bIsInUnitedStates = ($aPlace['calculated_country_code'] == 'us');
			}
			// if a street or house was found, look in interpolation lines table
			if ($iMaxRank_orig >= 28 && $aPlace && $aPlace['rank_search'] >= 26)
			{
				// if a house was found, search the interpolation line that is at least as close as the house
				$sSQL = 'SELECT place_id, parent_place_id, 30 as rank_search, ST_line_locate_point(linegeo,'.$sPointSQL.') as fraction';
				$sSQL .= ' FROM location_property_osmline';
				$sSQL .= ' WHERE ST_DWithin('.$sPointSQL.', linegeo, '.$fSearchDiam.')';
				$sSQL .= ' and indexed_status = 0 ';
				$sSQL .= ' ORDER BY ST_distance('.$sPointSQL.', linegeo) ASC limit 1';
				
				if (CONST_Debug)
				{
					$sSQL = preg_replace('/limit 1/', 'limit 100', $sSQL);
					var_dump($sSQL);

					$aAllHouses = chksql($this->oDB->getAll($sSQL));
					foreach($aAllHouses as $i)
					{
						echo $i['housenumber'] . ' | ' . $i['distance'] * 1000 . ' | ' . $i['lat'] . ' | ' . $i['lon']. ' | '. "<br>\n";
					}
				}
				$aPlaceLine = chksql($this->oDB->getRow($sSQL),
				                     "Could not determine closest housenumber on an osm interpolation line.");
				if ($aPlaceLine)
				{
					if (CONST_Debug) var_dump('found housenumber in interpolation lines table', $aPlaceLine);
					if ($aPlace['rank_search'] == 30)
					{
						// if a house was already found in placex, we have to find out, 
						// if the placex house or the interpolated house are closer to the searched point
						// distance between point and placex house
						$sSQL = 'SELECT ST_distance('.$sPointSQL.', house.geometry) as distance FROM placex as house WHERE house.place_id='.$iPlaceID;
						$aDistancePlacex = chksql($this->oDB->getRow($sSQL),
						                          "Could not determine distance between searched point and placex house.");
						$fDistancePlacex = $aDistancePlacex['distance'];
						// distance between point and interpolated house (fraction on interpolation line)
						$sSQL = 'SELECT ST_distance('.$sPointSQL.', ST_LineInterpolatePoint(linegeo, '.$aPlaceLine['fraction'].')) as distance';
						$sSQL .= ' FROM location_property_osmline WHERE place_id = '.$aPlaceLine['place_id'];
						$aDistanceInterpolation = chksql($this->oDB->getRow($sSQL),
						                                 "Could not determine distance between searched point and interpolated house.");
						$fDistanceInterpolation = $aDistanceInterpolation['distance'];
						if ($fDistanceInterpolation < $fDistancePlacex)
						{
							// interpolation is closer to point than placex house
							$bPlaceIsLine = true;
							$aPlace = $aPlaceLine;
							$iPlaceID = $aPlaceLine['place_id'];
							$iParentPlaceID = $aPlaceLine['parent_place_id']; // the street
							$fFraction = $aPlaceLine['fraction'];
							$iMaxRank = 30;
						}
						// else: nothing to do, take placex house from above
					}
					else
					{
						$bPlaceIsLine = true;
						$aPlace = $aPlaceLine;
						$iPlaceID = $aPlaceLine['place_id'];
						$iParentPlaceID = $aPlaceLine['parent_place_id']; // the street
						$fFraction = $aPlaceLine['fraction'];
						$iMaxRank = 30;
					}
				}
			}
			
			// Only street found? If it's in the US we can check TIGER data for nearest housenumber
			if (CONST_Use_US_Tiger_Data && $bIsInUnitedStates && $iMaxRank_orig >= 28 && $iPlaceID && ($aPlace['rank_search'] == 26 || $aPlace['rank_search'] == 27 ))
			{
				$fSearchDiam = 0.001;
				$sSQL = 'SELECT place_id,parent_place_id,30 as rank_search, ST_line_locate_point(linegeo,'.$sPointSQL.') as fraction';
				//if (CONST_Debug) { $sSQL .= ', housenumber, ST_distance('.$sPointSQL.', centroid) as distance, st_y(centroid) as lat, st_x(centroid) as lon'; }
				$sSQL .= ' FROM location_property_tiger WHERE parent_place_id = '.$iPlaceID;
				$sSQL .= ' AND ST_DWithin('.$sPointSQL.', linegeo, '.$fSearchDiam.')';  //no centroid anymore in Tiger data, now we have lines
				$sSQL .= ' ORDER BY ST_distance('.$sPointSQL.', linegeo) ASC limit 1';

				if (CONST_Debug)
				{
					$sSQL = preg_replace('/limit 1/', 'limit 100', $sSQL);
					var_dump($sSQL);

					$aAllHouses = chksql($this->oDB->getAll($sSQL));
					foreach($aAllHouses as $i)
					{
						echo $i['housenumber'] . ' | ' . $i['distance'] * 1000 . ' | ' . $i['lat'] . ' | ' . $i['lon']. ' | '. "<br>\n";
					}
				}

				$aPlaceTiger = chksql($this->oDB->getRow($sSQL),
				                      "Could not determine closest Tiger place.");
				if ($aPlaceTiger)
				{
					if (CONST_Debug) var_dump('found Tiger housenumber', $aPlaceTiger);
					$bPlaceIsTiger = true;
					$aPlace = $aPlaceTiger;
					$iPlaceID = $aPlaceTiger['place_id'];
					$iParentPlaceID = $aPlaceTiger['parent_place_id']; // the street
					$fFraction = $aPlaceTiger['fraction'];
					$iMaxRank = 30;
				}
			}

			// The point we found might be too small - use the address to find what it is a child of
			if ($iPlaceID && $iMaxRank < 28)
			{
				if (($aPlace['rank_search'] > 28 || $bPlaceIsTiger || $bPlaceIsLine) && $iParentPlaceID)
				{
					$iPlaceID = $iParentPlaceID;
				}
				$sSQL  = 'select address_place_id';
				$sSQL .= ' FROM place_addressline';
				$sSQL .= " WHERE place_id = $iPlaceID";
				$sSQL .= " ORDER BY abs(cached_rank_address - $iMaxRank) asc,cached_rank_address desc,isaddress desc,distance desc";
				$sSQL .= ' LIMIT 1';
				$iPlaceID = chksql($this->oDB->getOne($sSQL),
				                   "Could not get parent for place.");
				if (!$iPlaceID)
				{
					$iPlaceID = $aPlace['place_id'];
				}
			}
			return array('place_id' => $iPlaceID,
						'type' => $bPlaceIsTiger ? 'tiger' : ($bPlaceIsLine ? 'interpolation' : 'osm'),
						'fraction' => ($bPlaceIsTiger || $bPlaceIsLine) ? $fFraction : -1);
		}
		
	}
?>