<?php

header('Access-Control-Allow-Origin: *');
header("Access-Control-Allow-Headers: X-API-KEY, Origin, X-Requested-With, Content-Type, Accept, Access-Control-Request-Method");
header("Access-Control-Allow-Methods: GET, POST, OPTIONS, PUT, DELETE");
header("Allow: GET, POST, OPTIONS, PUT, DELETE");

if($_SERVER['REQUEST_METHOD'] == "POST"){
    if(empty($_POST)){
        echo json_encode(array(
            "status" => "error",
            "results" => "Por favor ingresa los campos necesarios."
        ));
        exit;
    }

    if(!isset($_POST["LAT"])){
        echo json_encode(array(
            "status" => "error",
            "results" => "El LAT es un campo necesario."
        ));
        exit;
    }

    if(!isset($_POST["LON"])){
        echo json_encode(array(
            "status" => "error",
            "results" => "El LON es un campo necesario."
        ));
        exit;
    }

    try{
        $ch = curl_init();
        if($ch === false){
            echo json_encode(array(
                "status" => "error",
                "results" => "Fallo al inicializar CURL."
            ));
            exit;
        }

        $lat = $_POST["LAT"];
        $lon = $_POST["LON"];
        $url = "https://api.opentopodata.org/v1/test-dataset?locations=$lat,$lon";

        curl_setopt($ch, CURLOPT_URL, $url);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

        $out = curl_exec($ch);

        if($out === false){
            echo json_encode(array(
                "status" => "error",
                "results" => 'Error: ' . curl_errno($ch) . ". Msg: " . curl_error($ch)
            ));
            exit;
        }

        echo $out;
    }catch(Exception $e){
        echo json_encode(array(
            "status" => "error",
            "results" => "Error al ejecutar la petición."
        ));
    }finally{
        if (is_resource($ch)) {
            curl_close($ch);
        }
    }
}else{
    echo json_encode(array(
        "status" => "error",
        "results" => "Bad Request."
    ));
}