<?php declare(strict_types=1);
/**
 * MIT License
 *
 * Copyright (c) 2021 Vuro Framework
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 */

namespace Vuro\Session;

use ArrayAccess;
use ArrayIterator;
use IteratorAggregate;
use Traversable;

/**
 * The abstract session manager.
 */
abstract class AbstractSessionManager implements ArrayAccess, IteratorAggregate, Traversable
{
    /**
     * Delete a key.
     *
     * @param string|int $key The key to delete.
     *
     * @return void No value is returned.
     */
    public function delete(string|int $key): void
    {
        unset($_SESSION[$key]);
    }

    /**
     * Key to retrieve.
     *
     * @param string|int $key          The key to retrieve.
     * @param mixed      $defualtValue The defualt value to return.
     *
     * @return mixed Can return all value types.
     */
    public function flash(string|int $key, mixed $defaultValue = null): mixed
    {
        $value = $this->has($key, $defaultValue);
        $this->delete($key);
        return $value;
    }

    /**
     * Key to retrieve.
     *
     * @param string|int $key          The key to retrieve.
     * @param mixed      $defualtValue The defualt value to return.
     *
     * @return mixed Can return all value types.
     */
    public function get(string|int $key, mixed $defaultValue = null): mixed
    {
        return $this->has($key) ? $_SESSION[$key] : $defualtValue;
    }

    /**
     * This iterator allows to unset and modify values and keys while iterating over Arrays and Objects.
     * Type-Hints are not needed for this method.
     *
     * @return void No value is returned.
     */
    public function getIterator()
    {
        return new ArrayIterator($_SESSION);
    }

    /**
     * Whether a key exists.
     *
     * @param string|int $key A key to check for.
     *
     * @return bool Returns true on success or false on failure. 
     */
    public function has(string|int $key): bool
    {
        return isset($_SESSION[$key]);
    }

    /**
     * Whether an offset exists.
     * Type-Hints are not needed for this method.
     *
     * @param mixed $offset An offset to check for.
     *
     * @return bool Returns true on success or false on failure. 
     */
    public function offsetExists($offset)
    {
        return $this->has($offset);
    }

    /**
     * Offset to retrieve.
     * Type-Hints are not needed for this method.
     *
     * @param mixed $offset The offset to retrieve.
     *
     * @return mixed Can return all value types.
     */
    public function offsetGet($offset)
    {
        return $this->get($offset);
    }

    /**
     * Assign a value to the specified offset.
     * Type-Hints are not needed for this method.
     *
     * @param mixed $offset The offset to assign the value to. 
     * @param mixed $value  The value to set.
     *
     * @return void No value is returned.
     */
    public function offsetSet($offset, $value)
    {
        $this->set($offset, $value);
    }

    /**
     * Unset an offset.
     * Type-Hints are not needed for this method.
     *
     * @param mixed $offset The offset to unset. 
     *
     * @return void No value is returned. 
     */
    public function offsetUnset($offset)
    {
        $this->delete($offset);
    }

    /**
     * Assign a value to the specified key.
     *
     * @param string|int $key   The key to assign the value to. 
     * @param mixed      $value The value to set.
     *
     * @return void No value is returned.
     */
    public function set(string|int $key, mixed $value): void
    {
        $_SESSION[$key] = $value;
    }
}