<?php
/**
 * functions/session.php
 *
 * This class is used for management of session data.
 *
 * @version 3.0
 * @author  Joey Kimsey <Joey@thetempusproject.com>
 * @link    https://TheTempusProject.com/Core
 * @license https://opensource.org/licenses/MIT [MIT LICENSE]
 */
namespace TheTempusProject\Bedrock\Functions;

use TheTempusProject\Canary\Bin\Canary as Debug;

class Session {
    /**
     * Checks if a session exists.
     *
     * @param {string} [$name] - The name of the session being checked for.
     * @return {bool}
     */
    public static function exists( $name ) {
        if (session_status() === PHP_SESSION_NONE) {
            session_start();
        }
        if ( ! Check::sessionName( $name ) ) {
            return false;
        }
        $sessionName = DEFAULT_SESSION_PREFIX . $name;
        if ( isset( $_SESSION[ $sessionName ] ) ) {
            return true;
        }
        Debug::log( "Session::exists - Session not found: $sessionName" );
        return false;
    }

    /**
     * Retrieves the value of a session if it exists
     *
     * @param {string} [$name] - The name of the session variable you are trying to retrieve.
     * @return {string|bool} - Returns the data from the session or false if nothing is found..
     */
    public static function get( $name ) {
        if ( ! Check::sessionName( $name ) ) {
            return false;
        }
        $sessionName = DEFAULT_SESSION_PREFIX . $name;
        if ( self::exists( $name ) ) {
            return $_SESSION[ $sessionName ];
        }
        Debug::log( "Session::get - Session not found: $sessionName" );
        return false;
    }

    /**
     * Creates a session.
     *
     * @param {string} [$name] - Session name.
     * @param {string} [$data] - Session data.
     * @return {bool}
     */
    public static function put( $name, $data ) {
        if (session_status() === PHP_SESSION_NONE) {
            session_start();
        }
        if ( ! Check::sessionName( $name ) ) {
            return false;
        }
        $sessionName = DEFAULT_SESSION_PREFIX . $name;
        $_SESSION[ $sessionName ] = $data;
        Debug::log( "Session::get - Created/Updated: $sessionName" );
        return true;
    }

    /**
     * Deletes the specified session.
     *
     * @param {string} [$name] - The name of the session to be destroyed.
     * @return {bool}
     */
    public static function delete( $name ) {
        if ( ! Check::sessionName( $name ) ) {
            return false;
        }
        $sessionName = DEFAULT_SESSION_PREFIX . $name;
        if ( self::exists( $name ) ) {
            unset( $_SESSION[$sessionName] );
            Debug::info( "Session::delete - Deleted $sessionName" );
            return true;
        }
        Debug::error( "Session::delete - Session not found." );
        return false;
    }

    /**
     * Intended as a self-destruct session. If the specified session does not
     * exist, it is created. If the specified session does exist, it will be
     * destroyed and returned.
     *
     * @param {string} [$name] - Session name to be created or checked
     * @param {string} [$data] - The string to be used if session needs to be created. (optional)
     * @return bool|string - Returns bool if creating, and a string if the check is successful.
     */
    public static function checkFlash( $name ) {
        if ( ! Check::sessionName( $name ) ) {
            return false;
        }
        if ( self::exists( $name ) ) {
            Debug::log("Session::flash - Exists");
            $session = self::get( $name );
            self::delete( $name );
            return $session;
        }
        return;
    }

    public static function flash( $name, $data = null ) {
        if ( ! Check::sessionName( $name ) ) {
            return false;
        }
        if ( ! empty( $data ) ) {
            self::put( $name, $data );
            Debug::log("Session::flash - Session created.");
            return true;
        }
        if ( self::exists( $name ) ) {
            Debug::log("Session::flash - Exists");
            $session = self::get( $name );
            self::delete( $name );
            return $session;
        }
        Debug::error("Session::flash - null return");
        return;
    }
}