<?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;

$failtowater = false;

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 = $long + 0.01;
} else if ($database->has('terrain', ["AND" => ["latitude" => $lat + .01, "longitude" => $long + .01]])) {
    $finallat = $finallat + 0.01;
    $finallong = $finallong + 0.01;
} else {
    $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",
    14 => "Urban and Built"
];

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