<?php

require 'required.php';

// 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);
}

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

if ($database->has('terrain', ["AND" => ["latitude" => $lat, "longitude" => $long]])) {
    // We're good
} else if ($database->has('terrain', ["AND" => ["latitude" => $lat + .01, "longitude" => $long]])) {
    $finallat = $lat + 0.01;
} else if ($database->has('terrain', ["AND" => ["latitude" => $lat, "longitude" => $long + .01]])) {
    $finallong = $long + 0.01;
} else {
    // last resort
    $tries = 0;
    while (!$database->has('terrain', ["AND" => ["latitude" => $finallat, "longitude" => $finallong]]) && $tries < 5) {
        $finallat = $finallat + 0.01;
        $finallong = $finallong + 0.01;
        $tries++;
    }
    if ($tries >= 5) {
        sendError("Terrain data not found for the given coordinates or anything nearby.", true);
    }
}

$terrainid = $database->select('terrain', 'type', ["AND" => ["latitude" => $finallat, "longitude" => $finallong]])[0];
$out = ["status" => "OK", "type" => $terrainid, "latitude" => $finallat, "longitude" => $finallong];
echo json_encode($out);