<?php

require 'required.php';

use AnthonyMartin\GeoLocation\GeoLocation as GeoLocation;

// Validate input
if (is_empty($VARS['lat']) || is_empty($VARS['long'])) {
    sendError("Missing information.", true);
}
if (!preg_match('/-?[0-9]{1,3}\.[0-9]{2,}/', $VARS['lat'])) {
    sendError("Latitude (lat) is in the wrong format.", true);
}
if (!preg_match('/-?[0-9]{1,3}\.[0-9]{2,}/', $VARS['long'])) {
    sendError("Longitude (long) is in the wrong format.", true);
}

// Round to 2 digits (approx. 1.1km)
$lat = (float) number_format((float) $VARS['lat'], 2, '.', '');
$long = (float) number_format((float) $VARS['long'], 2, '.', '');

if (abs($lat) > 90.00 || abs($long) > 180.00) {
    sendError("Coordinates out-of-bounds.  Are you sure you're on Earth?", true);
}

$userlocation = GeoLocation::fromDegrees($lat, $long);
$searchbounds = $userlocation->boundingCoordinates(1.2, 'km');

$finallat = $lat;
$finallong = $long;

$failtowater = false;

if (!$database->has('terrain', ['AND' => [
                'latitude[>]' => $searchbounds[0]->getLatitudeInDegrees(),
                'latitude[<]' => $searchbounds[1]->getLatitudeInDegrees(),
                'longitude[>]' => $searchbounds[0]->getLongitudeInDegrees(),
                'longitude[<]' => $searchbounds[1]->getLongitudeInDegrees()]
        ])) {
    $failtowater = true;
}

$terrainstrings = [
    0 => "Water",
    1 => "Evergreen Needleleaf Forest",
    2 => "Evergreen Broadleaf Forest",
    3 => "Deciduous Needleleaf Forest",
    4 => "Deciduous Broadleaf Forest",
    5 => "Mixed Forest",
    6 => "Woodland",
    7 => "Wooded Grassland",
    8 => "Closed Shrubland",
    9 => "Open Shrubland",
    10 => "Grassland",
    11 => "Cropland",
    12 => "Bare Ground",
    13 => "Urban and Built"
];

if ($failtowater) {
    $terrainid = 0;
} else {
    $terrainid = (int) $database->select('terrain', 'type', ['AND' => [
                    'latitude[>]' => $searchbounds[0]->getLatitudeInDegrees(),
                    'latitude[<]' => $searchbounds[1]->getLatitudeInDegrees(),
                    'longitude[>]' => $searchbounds[0]->getLongitudeInDegrees(),
                    'longitude[<]' => $searchbounds[1]->getLongitudeInDegrees()]
            ])[0];
    if ($terrainid == 14) {
        $terrainid = 13;
    }
}
$out = ["status" => "OK", "type" => $terrainid, "latitude" => $finallat, "longitude" => $finallong, "name" => $terrainstrings[$terrainid]];
echo json_encode($out);