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<?php if(!defined('ABSPATH')) { die(); } // This line ensures that the script is not run directly
/**
 * Utility Name: Upcoming Drafts Alert
 * Description: Sends an email to blog authors with upcoming or overdue posts
 * Author: Greg Schoppe
 * Author URI: https://gschoppe.com
 * Supports: input, cron
 * Version: 1.0.0
 * License: GPL-2.0+
 * License URI: http://www.gnu.org/licenses/gpl-2.0.txt
 **/

function uda_utility_input_html( $html ) {
	ob_start();
	?>
	<label>
		<span>Alert Threshold (in days): </span>
		<input type="number" name="alert_threshold" value="7" required min="1" step="1">
	</label>
	<?php
	return ob_get_clean();
}
add_filter('wp_util_input_html', 'uda_utility_input_html');

// this filter contains the actual meat and potatoes of your script
// ---
// $legacy will always be an empty string, but it needed to support a
// legacy version of the utility script format
// ---
// $state is an aritrary value you can return from the previous run of the script,
// and which will be passed through to the next run. One common use is to
// store an offset for paginated database queries. State will be falsy for the
// initial run. It is recommended to store data in state as keys in an array, to
// ensure no overlap with the reserved values of 'complete' and 'error' which
// trigger exiting the script
// ---
// $atts is an array, containing your input form fields, by name, EXCEPT file inputs
// ---
// $files contains an array of any file inputs that were included in the input form
// ---
function uda_utility_script( $legacy, $state, $atts, $files ) {
	$per_page        = 20;
	$alert_threshold = 7;
	$offset          = 0;
	$drafts          = array();
	if( !empty( $state['offset'] ) ) {
		$offset = $state['offset'];
	}
	if( !empty( $state['drafts'] ) ) {
		$drafts = $state['drafts'];
	}
	if( !empty( $atts['alert_threshold'] ) ) {
		$alert_threshold = intval( $atts['alert_threshold'] );
	}
	$retval = array(
		'state'   => 'error',
		'message' => 'an unknown error has occurred'
	);
	$args = array(
		'posts_per_page' => $per_page,
		'post_status' => 'draft',
		'post_type' => 'post',
		'date_query' => array(
			array(
				'before'    => '+' . $alert_threshold . ' days',
			)
		),
		'offset' => $offset
	);
	$posts = get_posts( $args );
	if( $posts ) {
		$now = time();
		foreach( $posts as $post ) {
			$author     = $post->post_author;
			$date_parts = explode( ' ', $post->post_date );
			$date = $date_parts[0];
			$postDate = strtotime( $post->post_date );
			$time_grp = 'future';
			if( $postDate <= $now ) {
				$time_grp = 'past';
			}
			$entry = array(
				'id'    => $post->ID,
				'title' => $post->post_title,
				'link'  => get_edit_post_link( $post->ID ),
				'date'  => $date
			);
			if( !isset( $drafts[$author] ) ) {
				$drafts[$author] = array(
					'past'   => array(),
					'future' => array()
				);
			}
			$drafts[$author][$time_grp][] = $entry;
		}
		return array(
			'state' => array(
				'offset' => $offset + $per_page,
				'drafts' => $drafts
			),
			'message' => "Parsed " . ( $offset + $per_page ) . " Draft Posts."
		);
	} else {
		add_filter( 'wp_mail_content_type','uda_wp_mail_set_content_type' );
		foreach( $drafts as $author => $author_drafts ) {
			$user    = get_userdata($author);
			$email   = $user->user_email;
			$subject = "Outstanding Draft posts for " . get_bloginfo('name');
			$message = uda_generate_email_message( $author_drafts );
			wp_mail( $email, $subject, $message );
		}
		return array(
			'state'   => 'complete',
			'message' => "Messages Sent"
		);
	}
}
add_filter('wp_util_script', 'uda_utility_script', 10, 4);

function uda_generate_email_message( $drafts ) {
	ob_start();
	?>
	<p>
		You're receiving this email because you have unpublished posts on
		<?php echo get_bloginfo('name') ?> that are nearing or have passed
		their publish date. Please check the status of the posts listed below.
	</p>
	<?php
	if( count( $drafts['future'] ) ) {
		?>
		<h2>Upcoming Draft Posts</h2>
		<table>
		<?php
		foreach( $drafts['future'] as $draft ) {
			?>
			<tr>
				<td><?php echo $draft['date']; ?></td><td><a href="<?php echo esc_attr( $draft['link'] ); ?>"><?php echo $draft['title']; ?></a></td>
			</tr>
			<?php
		}
		?>
		</table>
		<?php
	}
	if( count( $drafts['past'] ) ) {
		?>
		<h2>Past Due Draft Posts</h2>
		<table>
		<?php
		foreach( $drafts['past'] as $draft ) {
			?>
			<tr>
				<td><?php echo $draft['date']; ?></td><td><a href="<?php echo esc_attr( $draft['link'] ); ?>"><?php echo $draft['title']; ?></a></td>
			</tr>
			<?php
		}
		?>
		</table>
		<?php
	}
	return ob_get_clean();
}

function uda_wp_mail_set_content_type(){
	return "text/html";
}