post thumb nail image from upload directory

Hi,
I am trapped. I want to upload an image from front end. The image croped and uploaded to upload folder, Now I want to set that image as the featured image. I spend hours to make it fine. But no use. Please help me

<?php

$success = true;
function eeme_save_data_init() {
	if ( isset( $_POST[ 'eeme_form_submit' ] ) ) {
		foreach ($_POST['eeme_form_submit'] as $name) {
		# code...
			$variales = $name['name'];
			$values = $name['value'];
			$array[$variales] = $values;
		}
		//readigng the form values for users
		$image 			 = $array["image"];

		$username		 = esc_html( $array[ 'username' ] );
		$vorname		 = esc_html( $array[ 'vorname' ] );
		$nachename		 = esc_html( $array[ 'nachname' ] );
		$alter			 = (int) esc_html( $array[ 'alter' ] );
		$telefone		 = esc_html( $array[ 'telefon' ] );
		$email			 = esc_html( $array[ 'email' ] );
		$accept			 = $array[ 'accept' ];
		// reading the form values for the post
		$post_content	 = esc_textarea( $array[ 'limitedtextarea' ] );
		$title			 = wp_trim_words( $post_content, 3 );

		// form validation by using PHP

		if ( $accept != 'on' ) {
			die(_e( "Please accept the terms and conditions" ));
		}
		//Validating email
		if ( !is_email( $email ) ) {
			die(_e( "This is not a valid email" ));
		}
		//Valiadting age
		if ( !is_numeric( $alter ) ) {
			die(_e( "This is not a valid Number, enter a valid number" ));
		}
		$user_data_array = array( //hold user data
			'username'	 => $username,
			'vorname'	 => $vorname,
			'nachename'	 => $nachename,
			'alter'		 => $alter,
			'telefone'	 => $telefone,
			'email'		 => $email,
			'name'		 => $username
		);
		$post_data_array = array(
			'title'			 => $title,
			'description'	 => $post_content,
			'image'          => $image
		);
		//Check wheather user exist or not
		$have_email = (bool)email_exists( $email );
		$have_user = (bool)username_exists( $username );

		if ( $have_email && $have_user ) {
			$user_id = get_user_by( 'login', $username );
			eeme_post_upload( $post_data_array, $user_id->ID );
			$return_array["status"] = TRUE;
			die(_e(" <p>Vielen Dank fur deinen Beitrag! <br> Jeder Beitrag  wird  gepruft, bevor  er  freigeschaltet  wird. <br>Wir wunschen  dir viel  Gluck!</p>"));
		} else if(!$have_email && !$have_user){
			$user_id = eeme_user_insert( $user_data_array );
			eeme_post_upload( $post_data_array, $user_id );
			$return_array["status"] = TRUE;
			die(_e(" <p>Vielen Dank fur deinen Beitrag! <br> Jeder Beitrag  wird  gepruft, bevor  er  freigeschaltet  wird. <br>Wir wunschen  dir viel  Gluck!</p>"));
		}else {
			die(_e("Can not use same username/email with different email/username"));
		}

	}
	else{
			die(_e("Some unknown error occures, Please try again"));
	}

}
/*
 * Function eeme_user_insert() used to insert the details to the user table and user meta table
 * from the form
 * $user_data_array is an array that store all the value read from the form.
 * Return the id of user that created at the time
 */

function eeme_user_insert( $user_data_array ) {
	$userdata	 = array(
		'ID'			 => '',
		'user_pass' 	 => wp_generate_password( 12,true, true ),
		'nickname'		 => $user_data_array[ 'nachename' ],
		'user_login'	 => $user_data_array[ 'username' ],
		'user_email'	 => $user_data_array[ 'email' ],
		'display_name'	 => $user_data_array[ 'vorname' ],
		'first_name'	 => $user_data_array[ 'vorname' ],
		'role'			 => 'post_builder'
		);
	$id			 = wp_insert_user( $userdata );
	add_user_meta( $id, 'alter', $user_data_array[ 'alter' ] );
	add_user_meta( $id, 'telefone', $user_data_array[ 'telefone' ] );
	return $id;
}

/*
 * Function eeme_image_upload is used to upload the image
 * Return a boolean value
 * true if success else false
 */

function eeme_image_upload($post_id, $image ) {
	if ( !function_exists( 'wp_generate_attachment_metadata' ) ) {
		require_once(ABSPATH . "wp-admin" . '/includes/image.php');
		require_once(ABSPATH . "wp-admin" . '/includes/file.php');
		require_once(ABSPATH . "wp-admin" . '/includes/media.php');
	}

	if($image){
		//uploading the image
		$time = date('h:i:s');
		$dir = wp_upload_dir();
		$path = $dir['path'];
		$url = $dir['url'];
		$name_file = $post_id.$time.'.png';
		$file_path = $path.'/'.$name_file;
		$file_url = $url.'/'.$name_file;
		$filename = fopen( $file_path,"w+");
		chmod ( $file_path, 0777 );

		$data = $image;

		list($type, $data) = explode(';', $data);
		list(, $data)      = explode(',', $data);
		$data = base64_decode($data);
		file_put_contents($file_path, $data);
		$attachment = array(
		     'guid' => $file_path,
		     'post_mime_type' => '',
		     'post_content' => '',
		     'post_status' => 'publish'
  		);

	  $attach_id = wp_insert_attachment( $attachment, $name_file, $post_id );
	  //set_post_thumbnail( $post_id, $attach_id );
	  $thumb_attach_attr = wp_get_attachment_image_src( $attach_id );
	 $postmeta_id = add_post_meta($post_id , '_thumbnail', $thumb_attach_attr[0]);
	  //  die("attachment".var_dump($attach_id));
	  // require_once(ABSPATH . 'wp-admin/includes/image.php');
   //    $metadata = wp_generate_attachment_metadata( $attach_id, $file_url);

   //    wp_update_attachment_metadata( $attach_id, $metadata );

   //      // Finally! set our post thumbnail
   //      update_post_meta( $post_id, '_thumbnail_id', $attach_id );
	}
	// else{
	// 		$attach_id = NULL;
	// 		return $attach_id;
	// }
}

/*
 * Function eeme_post_upload is used to upload post from front end form
 * $post_data_array contain title and content of the post
 * $user_id is the id of user who create the post
 */

function eeme_post_upload( $post_data_array, $user_id ) {

	//and if you want to set that image as Post  then use:
	$post_information	 = array(
		'post_title'	 => $post_data_array[ 'title' ],
		'post_content'	 => $post_data_array[ 'description' ],
		'post_type'		 => 'post',
		'post_status'	 => 'publish',
		'post_category'	 => array( get_cat_id( 'Got the power' ) ),
		'tags_input'	 => '#Got the power',
		'post_author'	 => $user_id
	);
	$post_id			 = wp_insert_post( $post_information );
	$image_data   = $post_data_array[ 'image' ];
	$image_id = eeme_image_upload($post_id, $image_data );
	//die("image id".$image_id);
	//update_post_meta( $post_id, '_thumbnail_id', $image_id );
	//die("id".set_post_thumbnail( $post_id, $image_id ));

	// $file = $post_data_array['image'];
	// $attachment = array(
	// 	'post_mime_type' => '',
	// 	'post_title'     => '',
	// 	'post_content'   => '',
	// 	'post_status'    => 'inherit');
	// $attach_id = wp_insert_attachment( $attachment, $file, $post_id);
	// require_once(ABSPATH . 'wp-admin/includes/image.php');
 //    $attach_data = wp_generate_attachment_metadata( $attach_id, $file );
 //    $res1= wp_update_attachment_metadata( $attach_id, $attach_data );
 //    $res2= set_post_thumbnail( $post_id, $attach_id );

}
/*
* Ajax in wordpress
 */
function eeme_add_scripts(){
	wp_enqueue_script('eeme_script',get_template_directory_uri() . '/inc/js/eeme_ajax.js',array('jquery'), '1.0.0', true );
	wp_localize_script( 'eeme_script','eeme_save', array( 'ajaxurl' => admin_url( 'admin-ajax.php' ) ) );

}
add_action('wp_enqueue_scripts', 'eeme_add_scripts');
add_action('wp_ajax_eeme_save_data', 'eeme_save_data_init');
add_action('wp_ajax_nopriv_eeme_save_data', 'eeme_save_data_init');