<?php
	// API: index.php, entry point

	// mostrar errores
	ini_set('display_errors', 1);
	ini_set('display_startup_errors', 1);
	error_reporting(E_ALL | E_STRICT);


	// ensure session
	session_start();
	$session_user = isset($_SESSION['user']) ? $_SESSION['user'] : null;

	// get/post query
	$api_query = null;
	if ($_SERVER['REQUEST_METHOD'] === 'POST') {
		$api_query = $_POST;
    }
	else {
		$api_query = $_GET;
	}

	// execute query if valid
	check_actions($api_query);




	// ---------------------------------------------------- HELPERS

	// check action
	function check_actions($api_query) {

		$api_action = isset($api_query['action']) ? $api_query['action'] : null;

		$valid_actions = array('login','logout','private1','public1', 'oracle1');

		if (in_array( $api_action, $valid_actions )) {
			call_user_func('action_' . $api_action, $api_query);
		}
		else {
			return_results( 'unknown action: ' . $api_action , null);
		}

	}



	function return_results( $ret_error, $ret_obj ) {

		$ret = array(
			'error' => $ret_error,
			'result' => $ret_obj
		);

		header('Content-Type: application/json');
		echo json_encode($ret);

	}


	// --------------------------------- ACTIONS

	function action_logout() {
		session_destroy();
		return_results(null,"logged out");
	}


	function action_login($api_query) {
		session_destroy();

		$login_user = isset($api_query['user']) ? $api_query['user'] : '';
		$login_pass = isset($api_query['pass']) ? $api_query['pass'] : '';


		if ($login_pass === 'ok') {
			// login ok
			session_start();
			$_SESSION["user"] = $login_user;
			return_results(null, $login_user . ' logged successfully');
		}
		else {
			// login failed
			return_results('login error: ' . $login_user, null);
		}
	}



	function action_oracle1() {
		global $session_user;	// pick external variable

		if (!isset($session_user)) {
			return_results('sorry, you are not logged', null);
		}
		else {
			require('apilib/cons_simple.php');
		}
	}

?>