<?php


class Maillage {
	
	private $bbox = array();
	private $zoom = '';
	private $source = '';
	
	private $indexLongitude = array();
	private $indexLatitude  = array();
	private $mailles = array();
	
	private $bdd = null;
	
	
	public function __construct($bbox, $zoom, $source) {
		$this->bbox   = $this->calculerLimiteBboxGlobale($bbox);
		$this->zoom   = $zoom;
		$this->source = $source;
		$this->indexLongitude = array();
		$this->indexLatitude  = array();
		$this->mailles = array();
	}
	
	private function calculerLimiteBboxGlobale($bbox) {
		$bboxGlobale = $bbox[0];
		for ($index = 1; $index < count($bbox); $index ++) {
			if ($bbox[$index]['ouest'] < $bboxGlobale['ouest']) {
				$bboxGlobale['ouest'] = $bbox[$index]['ouest'];
			}
			if ($bbox[$index]['sud'] < $bboxGlobale['sud']) {
				$bboxGlobale['sud'] = $bbox[$index]['sud'];
			}
			if ($bbox[$index]['est'] > $bboxGlobale['est']) {
				$bboxGlobale['est'] = $bbox[$index]['est'];
			}
			if ($bbox[$index]['nord'] > $bboxGlobale['nord']) {
				$bboxGlobale['nord'] = $bbox[$index]['nord'];
			}
		}
		return $bboxGlobale;
	}
		
	
	public function genererMaillesVides() {
		$this->recupererIndexMaillesDansBbox();
		foreach ($this->indexLatitude as $indexLat => $intervalleLat) {
			$ligne = array();
			foreach ($this->indexLongitude as $indexLng => $intervalleLng) {
				$ligne[] = new Maille($intervalleLat[0], $intervalleLng[0], $intervalleLat[1],
						$intervalleLng[1], $indexLat, $indexLng);
			}
			$this->mailles[] = $ligne;
		}
	}
	
	
	private function recupererIndexMaillesDansBbox() {
		$conditionsLongitude = "";
		if ($this->bbox['ouest'] >  $this->bbox['est']) {
			$conditionsLongitude = "NOT(debut>=".$this->bbox['ouest']." AND fin<=".$this->bbox['est'].")";
		} else {
			$conditionsLongitude = "fin>=".$this->bbox['ouest']." AND debut <=".$this->bbox['est'];
		}
		$requete =
			"SELECT axe, position, debut, fin FROM mailles_index WHERE zoom=".$this->zoom." ".
			"AND (".
				"(axe='lat' AND fin>=".$this->bbox['sud']." AND debut<=".$this->bbox['nord'].") ".
				"OR (axe='lng' AND {$conditionsLongitude})".
			") ORDER BY axe, position";
		$indexMailles = $this->getBdd()->recupererTous($requete);
		
		foreach ($indexMailles as $index) {
			if ($index['axe'] == 'lng') {
				$this->indexLongitude[$index['position']] = array($index['debut'], $index['fin']);
			} else {
				$this->indexLatitude[$index['position']]  = array($index['debut'], $index['fin']);
			}
		}
	}
	
	private function getBdd() {
		if (is_null($this->bdd)) {
			$this->bdd = new Bdd();
		}
		$nomBdd = Config::get('bdd_nom_eflore');
		$this->bdd->requeter("USE ".$nomBdd);
		return $this->bdd;
	}
	
	
	public function ajouterStations(& $stations) {
		foreach ($stations as $station) {
			$longitude = $station['longitude'];
			$latitude = $station['latitude'];
			list($indexLongitude, $indexLatitude) = $this->rechercherIndexMaille($longitude, $latitude);
			$this->mailles[$indexLatitude][$indexLongitude]->ajouterStation($station, $this->source);
		}
	}
	
	public function ajouterMailles(& $mailles) {
		foreach ($mailles as $maille) {
			$longitude = ($maille['ouest'] + $maille['est'])  / 2;
			$latitude  = ($maille['sud']   + $maille['nord']) / 2;
			list($indexLongitude, $indexLatitude) = $this->rechercherIndexMaille($longitude, $latitude);
			$this->mailles[$indexLatitude][$indexLongitude]->combinerMailles($maille, $this->source);
		}
	}
		
	private function rechercherIndexMaille($longitude, $latitude) {
		$indexLatitude = 0;
		$indexLongitude = 0;
		while ($indexLatitude < count($this->indexLatitude) - 1
			&& $this->mailles[$indexLatitude][0]->getLatitudeNord() < $latitude) {
			$indexLatitude ++;
		}
		while ($indexLongitude < count($this->indexLongitude) - 1
			&& $this->mailles[$indexLatitude][$indexLongitude]->getLongitudeEst() < $longitude) {
				$indexLongitude ++;
		}
		return array($indexLongitude, $indexLatitude);
	}

	public function formaterSortie() {
		$mailles_resume = array();
		foreach ($this->mailles as $ligne) {
			foreach ($ligne as $maille) {
				$nombreStations = $maille->getNombrestations();
				if ($nombreStations > 0) {
					$mailles_resume[] = array(
						'type_site' => 'MAILLE',
						'sud'       => $maille->getLatitudeSud(),
						'ouest'     => $maille->getLongitudeOuest(),
						'nord'      => $maille->getLatitudeNord(),
						'est'       => $maille->getLongitudeEst(),
						'stations'     => $maille->getStations(),
						'observations' => $maille->getObservations()
					);
				}
			}
		}
		if (count($mailles_resume) == 0 || count($mailles_resume[0]) == 0)
			return array();
		return $mailles_resume;
	}

}

?>