<?php

function wpgpxmaps_isNGGalleryActive() {

	if ( ! function_exists( 'is_plugin_active' ) ) {
		require_once( wp_gpx_maps_sitePath() . '/wp-admin/includes/plugin.php' );
	}
	return is_plugin_active( 'nextgen-gallery/nggallery.php' );
}

function wpgpxmaps_isNGGalleryProActive() {

	if ( ! function_exists( 'is_plugin_active' ) ) {
		require_once( wp_gpx_maps_sitePath() . '/wp-admin/includes/plugin.php' );
	}
		return is_plugin_active( 'nextgen-gallery-pro/nggallery-pro.php' );
}

function getNGGalleryImages( $ngGalleries, $ngImages, $dt, $lat, $lon, $dtoffset, &$error ) {

	$result = array();
	$galids = explode( ',', $ngGalleries );
	$imgids = explode( ',', $ngImages );

	if ( ! wpgpxmaps_isNGGalleryActive() )

		return '';
	try {
		$pictures = array();
		foreach ( $galids as $g ) {
			$pictures = array_merge( $pictures, nggdb::get_gallery( $g ) );
		}
		foreach ( $imgids as $i ) {
			array_push( $pictures, nggdb::find_image( $i ) );
		}
		foreach ( $pictures as $p ) {
			$item         = array();
			$item['data'] = $p->thumbHTML;
			if ( is_callable( 'exif_read_data' ) ) {
				$exif = @exif_read_data( $p->imagePath );
				if ( $exif !== false ) {
					$item['lon'] = getExifGps( $exif['GPSLongitude'], $exif['GPSLongitudeRef'] );
					$item['lat'] = getExifGps( $exif['GPSLatitude'], $exif['GPSLatitudeRef'] );
					if ( ( $item['lat'] != 0 ) || ( $item['lon'] != 0 ) ) {
						$result[] = $item;
					} elseif ( isset( $p->imagedate ) ) {
						$_dt   = strtotime( $p->imagedate ) + $dtoffset;
						$_item = findItemCoordinate( $_dt, $dt, $lat, $lon );
						if ( $_item != null ) {
							$item['lat'] = $_item['lat'];
							$item['lon'] = $_item['lon'];
							$result[] = $item;
						}
					}
				}
			} else {
				$error .= "Sorry, <a href='https://php.net/manual/en/function.exif-read-data.php' target='_blank' rel='noopener noreferrer'>exif_read_data</a> function not found! check your hosting.<br />";
			}
		}
		/* START FIX NEXT GEN GALLERY 2.x */
		if ( class_exists( 'C_Component_Registry' ) ) {
			$renderer                  = C_Component_Registry::get_instance()->get_utility( 'I_Displayed_Gallery_Renderer' );
			$params['gallery_ids']     = $ngGalleries;
			$params['image_ids']       = $ngImages;
			$params['display_type']    = NEXTGEN_GALLERY_BASIC_THUMBNAILS;
			$params['images_per_page'] = 999;
			/* Salso add js references to get the gallery working */
			$dummy = $renderer->display_images( $params, $inner_content );

			/* START FIX NEXT GEN GALLERY PRO */

			if ( preg_match( "/data-nplmodal-gallery-id=[\"'](.*?)[\"']/", $dummy, $m ) ) {
				$galid = $m[1];
				if ( $galid ) {
					for ( $i = 0; $i < count( $result ); ++$i ) {
						$result[$i]['data'] = str_replace( '%PRO_LIGHTBOX_GALLERY_ID%', $galid, $result[$i]['data'] );
					}
				}
			}
			/* END FIX NEXT GEN GALLERY PRO */
		}
		/* END FIX NEXT GEN GALLERY 2.x */

	} catch ( Exception $e ) {
		$error .= 'Error When Retrieving NextGen Gallery galleries/images: $e <br />';
	}
	return $result;
}

function findItemCoordinate( $imgdt, $dt, $lat, $lon ) {

	foreach ( array_keys( $dt ) as $i ) {
		if ( $i != 0 && $imgdt >= $dt[$i - 1] && $imgdt <= $dt[$i] ) {
			if ( $lat[$i] != 0 && $lon[$i] != 0 )
			return array(
				'lat' => $lat[$i],
				'lon' => $lon[$i],
			);
		}
	}
	return null;
}

function getExifGps( $exifCoord, $hemi ) {

	$degrees = count( $exifCoord ) > 0 ? gps2Num( $exifCoord[0] ) : 0;
	$minutes = count( $exifCoord ) > 1 ? gps2Num( $exifCoord[1] ) : 0;
	$seconds = count( $exifCoord ) > 2 ? gps2Num( $exifCoord[2] ) : 0;
	$flip    = ( $hemi == 'W' or $hemi == 'S' ) ? -1 : 1;

	return $flip * ( $degrees + $minutes / 60 + $seconds / 3600 );
}

function gps2Num( $coordPart ) {

	$parts = explode( '/', $coordPart );

	if ( count( $parts ) <= 0 )
	return 0;

	if ( count( $parts ) == 1 )
	return $parts[0];

		$lat = floatval( $parts[0] );
		$lon = floatval( $parts[1] );

	if ($lon == 0 )
	return $lat;
	return $lat / $lon;
}
