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<?php

namespace VSP\Core;

defined( 'ABSPATH' ) || exit;

use ReflectionClass;
use ReflectionException;
use ReflectionMethod;
use VSP\Framework;

/**
 * Class VSP_Class_Handler
 *
 * @author Varun Sridharan <varunsridharan23@gmail.com>
 */
abstract class Instance_Handler {
    /**
     * Stores all plugins instances
     *
     * @var array
     */
    private static $_instances = array();

    /**
     * Stores plugins class instances
     *
     * @var array
     */
    protected $instances = array();

    /**
     * Returns Current Instance / create a new instance
     *
     * @return bool|self|static|$this
     */
    public static function instance() {
        $class = static::class;
        if ( ! isset( self::$_instances[ $class ] ) ) {
            try {
                $refl                       = new ReflectionClass( $class );
                self::$_instances[ $class ] = $refl->newInstanceArgs( func_get_args() );
            } catch ( ReflectionException $exception ) {

            }
        }
        return isset( self::$_instances[ $class ] ) ? self::$_instances[ $class ] : false;
    }

    /**
     * Gets Given key's instance
     *
     * @param string $key .
     *
     * @return bool|mixed
     */
    protected function get_instance( $key ) {
        if ( isset( self::$_instances[ $key ] ) ) {
            return self::$_instances[ $key ];
        }
        return ( isset( $this->instances[ $key ] ) ) ? $this->instances[ $key ] : false;
    }

    /**
     * Creats a new instance for a given class
     *
     * @param        $key
     * @param        $instance
     */
    protected function set_instance( $key, $instance ) {
        $this->instances[ $key ] = $instance;
    }

    /**
     * Checks & Fetches Framework Key.
     *
     * @return array|bool|false|string
     * @since {NEWVERSION}
     */
    private function get_framework_key() {
        if ( $this instanceof Framework ) {
            return static::class;
        }

        if ( property_exists( $this, 'plugin_class' ) && ! empty( $this->plugin_class ) ) {
            return ( $this->plugin_class instanceof Framework ) ? get_class( $this->plugin_class ) : $this->plugin_class;
        }
        return false;
    }

    /**
     * Generates Class Instance.
     *
     * @param string $class
     * @param mixed  $arguments
     *
     * @return object
     * @throws \ReflectionException
     * @since {NEWVERSION}
     */
    private function generate_instance( $class, $arguments ) {
        $refl = new ReflectionClass( $class );
        if ( $refl->isSubclassOf( '\VSP\Base' ) ) {
            $instance     = $refl->newInstanceWithoutConstructor();
            $plugin_class = $refl->getProperty( 'plugin_class' );
            $plugin_class->setAccessible( 'public' );
            $plugin_class->setValue( $instance, $this->get_framework_key() );
            $plugin_class->setAccessible( 'protected' );
            $constructor = $refl->getConstructor();
            if ( $constructor instanceof ReflectionMethod && $constructor->isConstructor() ) {
                $constructor->invokeArgs( $instance, $arguments );
            }
            return $instance;
        }
        return $refl->newInstanceArgs( $arguments );
    }

    /**
     * @param       $class
     * @param mixed ...$arguments
     *
     * @return object
     */
    public function _instance( $class, ...$arguments ) {
        if ( $this->get_instance( $class ) === false ) {
            try {
                $ins = $this->generate_instance( $class, $arguments );
                $this->set_instance( $class, $ins );
                return $ins;
            } catch ( ReflectionException $exception ) {
            }
        }
        return $this->get_instance( $class );
    }

    /**
     * Creates New Instance & Stores It.
     *
     * @param string $class
     * @param string $id
     * @param mixed  ...$arguments
     *
     * @return bool|mixed
     * @since {NEWVERSION}
     */
    public function create( $class, $id = '', ...$arguments ) {
        $id = ( empty( $id ) ) ? $class : $id;
        if ( $this->get_instance( $id ) === false ) {
            try {
                $ins = $this->generate_instance( $class, $arguments );
                $this->set_instance( $id, $ins );
            } catch ( ReflectionException $exception ) {
            }
        }
        return $this->get_instance( $id );
    }
}