<?php
/**
 * Plugin Name: Adslastica
 * Description: Simple AdSense helper for manual shortcode ads and automatic post ad placement.
 * Version: 1.6.6
 * Author: digidepot
 * License: GPL2+
 * Text Domain: adslastica
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

define( 'ADSLASTICA_VERSION', '1.6.6' );

add_action( 'admin_menu', 'adslastica_add_admin_menu' );
add_action( 'admin_enqueue_scripts', 'adslastica_admin_styles' );
add_action( 'wp_enqueue_scripts', 'adslastica_enqueue_adsense_header' );
add_action( 'template_redirect', 'adslastica_maybe_serve_ads_txt', 0 );

// Form Post Handlers
add_action( 'admin_post_adslastica_save_publisher', 'adslastica_save_publisher_settings' );

// AJAX Handlers for Instant Saving without Page Reload
add_action( 'wp_ajax_adslastica_save_ad_1', 'adslastica_ajax_save_ad_1' );
add_action( 'wp_ajax_adslastica_save_ad_2', 'adslastica_ajax_save_ad_2' );
add_action( 'wp_ajax_adslastica_save_post_ads', 'adslastica_ajax_save_post_ads' );

add_filter( 'the_content', 'adslastica_insert_post_ads', 20 );

add_shortcode( 'adslastica_ad_1', 'adslastica_shortcode_manual_ad_1' );
add_shortcode( 'adslastica_ad_2', 'adslastica_shortcode_manual_ad_2' );

function adslastica_normalize_publisher_id( $publisher_id ) {
	$publisher_id = strtolower( trim( (string) $publisher_id ) );
	$publisher_id = str_replace( array( '–', '—', '−', '‑', '`', '"', "'" ), array( '-', '-', '-', '-', '', '', '' ), $publisher_id );
	$publisher_id = preg_replace( '/\s+/', '', $publisher_id );

	if ( preg_match( '/^ca-pub-\d{16}$/', $publisher_id ) ) return $publisher_id;
	if ( preg_match( '/^pub-\d{16}$/', $publisher_id ) ) return 'ca-' . $publisher_id;
	if ( preg_match( '/^\d{16}$/', $publisher_id ) ) return 'ca-pub-' . $publisher_id;

	return '';
}

function adslastica_get_allowed_ad_html() {
	$allowed_html = wp_kses_allowed_html( 'post' );

	$allowed_html['script'] = array(
		'async'          => true,
		'src'            => true,
		'crossorigin'    => true,
		'type'           => true,
		'data-ad-client' => true,
	);

	$allowed_html['ins'] = array(
		'class'                      => true,
		'style'                      => true,
		'data-ad-client'             => true,
		'data-ad-slot'               => true,
		'data-ad-format'             => true,
		'data-full-width-responsive' => true,
		'data-ad-layout'             => true,
		'data-ad-layout-key'         => true,
		'data-ad-channel'            => true,
	);

	return $allowed_html;
}

function adslastica_get_ads_txt_line() {
	$publisher_id = adslastica_normalize_publisher_id( get_option( 'adslastica_publisher_id', '' ) );
	return ( '' === $publisher_id ) ? '' : 'google.com, ' . substr( $publisher_id, 3 ) . ', DIRECT, f08c47fec0942fa0';
}

function adslastica_get_ads_txt_url() {
	return home_url( '/ads.txt' );
}

function adslastica_get_physical_ads_txt_path() {
	return trailingslashit( ABSPATH ) . 'ads.txt';
}

function adslastica_maybe_serve_ads_txt() {
	$line = adslastica_get_ads_txt_line();
	if ( '' === $line || file_exists( adslastica_get_physical_ads_txt_path() ) ) return;

	$request_uri  = isset( $_SERVER['REQUEST_URI'] ) ? sanitize_text_field( wp_unslash( $_SERVER['REQUEST_URI'] ) ) : '';
	$request_path = wp_parse_url( $request_uri, PHP_URL_PATH );
	$ads_txt_path = wp_parse_url( adslastica_get_ads_txt_url(), PHP_URL_PATH );

	if ( untrailingslashit( (string) $request_path ) !== untrailingslashit( (string) $ads_txt_path ) ) return;

	status_header( 200 );
	header( 'Content-Type: text/plain; charset=utf-8' );
	nocache_headers();
	echo esc_html( $line );
	exit;
}

function adslastica_get_ads_txt_status() {
	$line = adslastica_get_ads_txt_line();
	$url  = adslastica_get_ads_txt_url();

	if ( '' === $line ) {
		return array( 'status' => 'missing_id', 'message' => 'Publisher ID is missing or invalid.', 'line' => '', 'url' => $url );
	}

	$physical_path = adslastica_get_physical_ads_txt_path();
	if ( file_exists( $physical_path ) ) {
		$physical_contents = file_get_contents( $physical_path );
		if ( false !== $physical_contents && false !== strpos( $physical_contents, $line ) ) {
			return array( 'status' => 'active', 'message' => 'ads.txt is active.', 'line' => $line, 'url' => $url );
		}
		return array( 'status' => 'physical_conflict', 'message' => 'An existing ads.txt file was found.', 'line' => $line, 'url' => $url );
	}

	$response = wp_remote_get( add_query_arg( 'adslastica_check', time(), $url ), array( 'timeout' => 5, 'headers' => array( 'Cache-Control' => 'no-cache' ) ) );
	if ( ! is_wp_error( $response ) && 200 === (int) wp_remote_retrieve_response_code( $response ) ) {
		if ( false !== strpos( wp_remote_retrieve_body( $response ), $line ) ) {
			return array( 'status' => 'active', 'message' => 'ads.txt is active.', 'line' => $line, 'url' => $url );
		}
	}

	return array( 'status' => 'unavailable', 'message' => 'ads.txt is not available.', 'line' => $line, 'url' => $url );
}

function adslastica_add_admin_menu() {
	add_menu_page( 'Adslastica', 'Adslastica', 'manage_options', 'adslastica', 'adslastica_render_settings_page', 'dashicons-megaphone', 65 );
}

function adslastica_save_publisher_settings() {
	if ( ! current_user_can( 'manage_options' ) ) wp_die( 'Unauthorized' );
	check_admin_referer( 'adslastica_save_publisher_action', 'adslastica_publisher_nonce' );

	$publisher_input = isset( $_POST['adslastica_publisher_id'] ) ? trim( sanitize_text_field( wp_unslash( $_POST['adslastica_publisher_id'] ) ) ) : '';

	if ( '' === $publisher_input ) {
		update_option( 'adslastica_publisher_id', '' );
		wp_safe_redirect( add_query_arg( array( 'page' => 'adslastica', 'adslastica_message' => 'publisher_removed' ), admin_url( 'admin.php' ) ) );
		exit;
	}

	$publisher_id = adslastica_normalize_publisher_id( $publisher_input );
	if ( '' === $publisher_id ) {
		wp_safe_redirect( add_query_arg( array( 'page' => 'adslastica', 'adslastica_message' => 'publisher_invalid' ), admin_url( 'admin.php' ) ) );
		exit;
	}

	update_option( 'adslastica_publisher_id', $publisher_id );
	wp_safe_redirect( add_query_arg( array( 'page' => 'adslastica', 'adslastica_message' => 'publisher_saved' ), admin_url( 'admin.php' ) ) );
	exit;
}

/* AJAX Handlers */
function adslastica_ajax_save_ad_1() {
	check_ajax_referer( 'adslastica_save_ad_1_action', 'adslastica_ad_1_nonce' );
	if ( ! current_user_can( 'manage_options' ) ) wp_send_json_error( 'Unauthorized' );

	$ad_code = isset( $_POST['adslastica_manual_ad_1'] ) ? wp_kses( wp_unslash( $_POST['adslastica_manual_ad_1'] ), adslastica_get_allowed_ad_html() ) : '';
	update_option( 'adslastica_manual_ad_1', $ad_code );
	update_option( 'adslastica_manual_ad_1_enabled', isset( $_POST['adslastica_manual_ad_1_enabled'] ) ? 1 : 0 );

	wp_send_json_success( 'Ad 1 settings updated.' );
}

function adslastica_ajax_save_ad_2() {
	check_ajax_referer( 'adslastica_save_ad_2_action', 'adslastica_ad_2_nonce' );
	if ( ! current_user_can( 'manage_options' ) ) wp_send_json_error( 'Unauthorized' );

	$ad_code = isset( $_POST['adslastica_manual_ad_2'] ) ? wp_kses( wp_unslash( $_POST['adslastica_manual_ad_2'] ), adslastica_get_allowed_ad_html() ) : '';
	update_option( 'adslastica_manual_ad_2', $ad_code );
	update_option( 'adslastica_manual_ad_2_enabled', isset( $_POST['adslastica_manual_ad_2_enabled'] ) ? 1 : 0 );

	wp_send_json_success( 'Ad 2 settings updated.' );
}

function adslastica_ajax_save_post_ads() {
	check_ajax_referer( 'adslastica_save_post_ads_action', 'adslastica_post_ads_nonce' );
	if ( ! current_user_can( 'manage_options' ) ) wp_send_json_error( 'Unauthorized' );

	for ( $i = 1; $i <= 3; $i++ ) {
		$key  = 'adslastica_post_ad_' . $i;
		$code = isset( $_POST[ $key ] ) ? wp_kses( wp_unslash( $_POST[ $key ] ), adslastica_get_allowed_ad_html() ) : '';
		update_option( $key, $code );
	}

	$placement_keys = array(
		'before_post',
		'after_paragraph_2',
		'middle_post',
		'before_last_paragraph',
		'after_post',
	);
	$used_ads = array();

	foreach ( $placement_keys as $placement_key ) {
		$field = 'adslastica_post_placement_' . $placement_key;
		$value = isset( $_POST[ $field ] ) ? absint( $_POST[ $field ] ) : 0;

		if ( $value < 1 || $value > 3 || in_array( $value, $used_ads, true ) ) {
			$value = 0;
		} else {
			$used_ads[] = $value;
		}

		update_option( $field, $value );
	}

	wp_send_json_success( 'Post Ads settings updated.' );
}

function adslastica_enqueue_adsense_header() {
	$publisher_id = adslastica_normalize_publisher_id( get_option( 'adslastica_publisher_id', '' ) );
	if ( '' === $publisher_id ) return;

	wp_enqueue_script(
		'adslastica-adsense',
		'https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js?client=' . rawurlencode( $publisher_id ),
		array(),
		ADSLASTICA_VERSION,
		array( 'strategy' => 'async' )
	);
}

function adslastica_admin_styles( $hook ) {
	if ( 'toplevel_page_adslastica' !== $hook ) return;

	wp_add_inline_style(
		'common',
		'
		.adslastica-wrap { max-width: 900px; }
		.adslastica-card {
			background: #ffffff; padding: 20px; border: 1px solid #dcdcde;
			border-left: 4px solid #2271b1; margin-top: 18px; border-radius: 8px;
			max-width: 860px; box-shadow: 0 1px 2px rgba(0,0,0,0.04);
		}
		.adslastica-card-ad-1 { border-left-color: #2271b1; }
		.adslastica-card-ad-2 { border-left-color: #00a32a; }
		.adslastica-shortcode-row { display: flex; align-items: center; gap: 8px; margin: 8px 0 14px; }
		.adslastica-shortcode-box {
			width: 220px !important; max-width: 220px !important; padding: 8px 10px;
			font-size: 16px; font-family: Consolas, Monaco, monospace; background: #f6f7f7;
			border: 1px solid #c3c4c7; border-radius: 4px; margin: 0 !important; display: block; box-sizing: border-box;
		}
		.adslastica-copy-shortcode { min-width: 76px; height: 36px; }
		.adslastica-card h3 { margin-top: 0; color: #1d2327; border-bottom: 1px solid #f0f0f1; padding-bottom: 12px; line-height: 1.4; }
		.adslastica-card input[type="text"] { width: 100%; max-width: 420px; padding: 8px; margin-bottom: 10px; }
		.adslastica-card textarea {
			width: 100%; max-width: 820px; height: 180px; min-height: 180px;
			font-family: Consolas, Monaco, monospace; font-size: 15px; line-height: 1.6;
			padding: 12px; background: #f6f7f7; border: 1px solid #c3c4c7; border-radius: 4px; display: block; box-sizing: border-box;
		}
		.adslastica-card p.submit { margin-bottom: 0; padding-bottom: 0; }
		.adslastica-status { margin: 4px 0 0; font-size: 14px; line-height: 1.7; }
		.adslastica-status-good { color: #008a20; }
		.adslastica-status-error { color: #b32d2e; }
		.adslastica-manual-line { max-width: 760px; margin-top: 12px; padding: 12px; background: #f6f7f7; border: 1px solid #dcdcde; border-radius: 4px; }
		.adslastica-manual-line code { display: block; margin-bottom: 10px; white-space: normal; word-break: break-word; }
		.adslastica-collapsible { margin-top: 18px; max-width: 860px; }
		.adslastica-collapsible > summary {
			cursor: pointer; list-style: none; background: #ffffff; padding: 16px 20px;
			border: 1px solid #dcdcde; border-left: 4px solid #2271b1; border-radius: 8px;
			box-shadow: 0 1px 2px rgba(0,0,0,0.04); font-size: 16px; font-weight: 600; color: #1d2327;
		}
		.adslastica-collapsible > summary::-webkit-details-marker { display: none; }
		.adslastica-collapsible > summary::after { content: "\25BC"; float: right; font-size: 12px; margin-top: 3px; }
		.adslastica-collapsible[open] > summary::after { content: "\25B2"; }
		.adslastica-collapsible .adslastica-card { margin-top: 12px; }
		.adslastica-post-ad-tabs { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-bottom: 12px; }
		.adslastica-post-ad-tab { width: 100%; min-height: 40px; font-weight: 600; }
		.adslastica-post-ad-tab.is-active { background: #2271b1; border-color: #2271b1; color: #fff; }
		.adslastica-post-ad-panel { display: none; padding: 16px; background: #f3f7fb; border: 1px solid #d6e2ee; border-radius: 6px; }
		.adslastica-post-ad-panel.is-active { display: block; }
		.adslastica-post-ad-panel textarea { height: 130px; min-height: 130px; background: #fff; }
		@media (max-width: 600px) { .adslastica-post-ad-tabs { gap: 6px; } }
		.adslastica-placement-table { width: 100%; max-width: 620px; border-collapse: collapse; margin-top: 8px; }
		.adslastica-placement-table th, .adslastica-placement-table td { text-align: left; padding: 10px 8px; border-bottom: 1px solid #dcdcde; font-size: 15px; }
		.adslastica-placement-table th { padding-top: 0; }
		.adslastica-placement-table select { min-width: 130px; }
		.adslastica-help { color: #50575e; margin-top: 8px; font-size: 14px; line-height: 1.5; }

		/* Styled Green AJAX Notification */
		.adslastica-ajax-notice {
			display: none;
			background: #edfaef;
			border: 1px solid #00a32a;
			border-left: 4px solid #00a32a;
			color: #007017;
			padding: 10px 15px;
			margin: 12px 0 0;
			border-radius: 4px;
			font-weight: 600;
			font-size: 14px;
		}
		'
	);
}

function adslastica_render_settings_page() {
	$ads_txt_status = adslastica_get_ads_txt_status();
	$message_code   = sanitize_key( (string) filter_input( INPUT_GET, 'adslastica_message', FILTER_UNSAFE_RAW ) );
	?>
	<div class="wrap adslastica-wrap">
		<h1>Adslastica Settings</h1>

		<?php if ( 'publisher_saved' === $message_code ) : ?>
			<div class="notice notice-success is-dismissible"><p><strong>Publisher ID settings updated.</strong></p></div>
		<?php elseif ( 'publisher_invalid' === $message_code ) : ?>
			<div class="notice notice-error is-dismissible"><p><strong>Enter a valid Publisher ID, such as ca-pub-1234567890123456.</strong></p></div>
		<?php endif; ?>

		<div class="adslastica-card">
			<h3>Publisher ID</h3>
			<form method="post" action="<?php echo esc_url( admin_url( 'admin-post.php' ) ); ?>">
				<input type="hidden" name="action" value="adslastica_save_publisher">
				<?php wp_nonce_field( 'adslastica_save_publisher_action', 'adslastica_publisher_nonce' ); ?>

				<input type="text" name="adslastica_publisher_id" value="<?php echo esc_attr( (string) get_option( 'adslastica_publisher_id', '' ) ); ?>" placeholder="ca-pub-1234567890123456">

				<?php submit_button( 'Save ID' ); ?>
			</form>

			<?php if ( 'missing_id' !== $ads_txt_status['status'] ) : ?>
				<p class="adslastica-status adslastica-status-good">&#10003; Publisher ID is saved.</p>
			<?php endif; ?>

			<?php if ( 'active' === $ads_txt_status['status'] ) : ?>
				<p class="adslastica-status adslastica-status-good">&#10003; <?php echo esc_html( $ads_txt_status['message'] ); ?> <a href="<?php echo esc_url( $ads_txt_status['url'] ); ?>" target="_blank" rel="noopener noreferrer">View ads.txt</a></p>
			<?php else : ?>
				<p class="adslastica-status adslastica-status-error">&#10007; <?php echo esc_html( $ads_txt_status['message'] ); ?></p>
				<?php if ( ! empty( $ads_txt_status['line'] ) ) : ?>
					<div class="adslastica-manual-line">
						<code id="adslastica-ads-txt-line"><?php echo esc_html( $ads_txt_status['line'] ); ?></code>
						<button type="button" class="button" id="adslastica-copy-ads-txt">Copy ads.txt line</button>
					</div>
				<?php endif; ?>
			<?php endif; ?>
		</div>

		<details id="adslastica-manual-ads" class="adslastica-collapsible" open>
			<summary>Manual Ads</summary>

			<!-- Visible Green Banner -->
			<div id="adslastica-ajax-msg" class="adslastica-ajax-notice">
				✓ <span id="adslastica-ajax-text">Settings updated successfully.</span>
			</div>

			<div class="adslastica-card adslastica-card-ad-1">
				<h3>Ad 1</h3>
	
				<div class="adslastica-shortcode-row">
					<input type="text" id="adslastica-shortcode-1" value="[adslastica_ad_1]" readonly class="adslastica-shortcode-box">
					<button type="button" class="button adslastica-copy-shortcode" data-copy-target="adslastica-shortcode-1">Copy</button>
				</div>
	
				<form id="form-adslastica-ad-1">
					<input type="hidden" name="action" value="adslastica_save_ad_1">
					<?php wp_nonce_field( 'adslastica_save_ad_1_action', 'adslastica_ad_1_nonce' ); ?>
	
					<textarea name="adslastica_manual_ad_1" rows="8"><?php echo esc_textarea( (string) get_option( 'adslastica_manual_ad_1', '' ) ); ?></textarea>
	
					<p>
						<label>
							<input type="checkbox" name="adslastica_manual_ad_1_enabled" value="1" <?php checked( get_option( 'adslastica_manual_ad_1_enabled' ), 1 ); ?>>
							<strong>Enable Ad 1</strong>
						</label>
					</p>
	
					<input type="submit" class="button button-primary" value="Save Ad 1">
				</form>
			</div>
	
			<div class="adslastica-card adslastica-card-ad-2">
				<h3>Ad 2</h3>
	
				<div class="adslastica-shortcode-row">
					<input type="text" id="adslastica-shortcode-2" value="[adslastica_ad_2]" readonly class="adslastica-shortcode-box">
					<button type="button" class="button adslastica-copy-shortcode" data-copy-target="adslastica-shortcode-2">Copy</button>
				</div>
	
				<form id="form-adslastica-ad-2">
					<input type="hidden" name="action" value="adslastica_save_ad_2">
					<?php wp_nonce_field( 'adslastica_save_ad_2_action', 'adslastica_ad_2_nonce' ); ?>
	
					<textarea name="adslastica_manual_ad_2" rows="8"><?php echo esc_textarea( (string) get_option( 'adslastica_manual_ad_2', '' ) ); ?></textarea>
	
					<p>
						<label>
							<input type="checkbox" name="adslastica_manual_ad_2_enabled" value="1" <?php checked( get_option( 'adslastica_manual_ad_2_enabled' ), 1 ); ?>>
							<strong>Enable Ad 2</strong>
						</label>
					</p>
	
					<input type="submit" class="button button-primary" value="Save Ad 2">
				</form>
			</div>
		</details>

		<details id="adslastica-post-ads" class="adslastica-collapsible">
			<summary>Post Ads</summary>

			<div id="adslastica-post-ajax-msg" class="adslastica-ajax-notice">
				✓ <span id="adslastica-post-ajax-text">Post Ads settings updated.</span>
			</div>

			<div class="adslastica-card">
				<form id="form-adslastica-post-ads">
					<input type="hidden" name="action" value="adslastica_save_post_ads">
					<?php wp_nonce_field( 'adslastica_save_post_ads_action', 'adslastica_post_ads_nonce' ); ?>

					<div class="adslastica-post-ad-tabs" role="tablist" aria-label="Post Ads">
						<?php for ( $i = 1; $i <= 3; $i++ ) : ?>
							<button type="button" class="button adslastica-post-ad-tab<?php echo 1 === $i ? ' is-active' : ''; ?>" data-adslastica-post-tab="<?php echo esc_attr( (string) $i ); ?>" aria-selected="<?php echo 1 === $i ? 'true' : 'false'; ?>">Ad <?php echo esc_html( (string) $i ); ?></button>
						<?php endfor; ?>
					</div>

					<?php for ( $i = 1; $i <= 3; $i++ ) : ?>
						<div class="adslastica-post-ad-panel<?php echo 1 === $i ? ' is-active' : ''; ?>" data-adslastica-post-panel="<?php echo esc_attr( (string) $i ); ?>">
							<textarea aria-label="Post Ad <?php echo esc_attr( (string) $i ); ?> code" name="adslastica_post_ad_<?php echo esc_attr( (string) $i ); ?>" rows="6"><?php echo esc_textarea( (string) get_option( 'adslastica_post_ad_' . $i, '' ) ); ?></textarea>
						</div>
					<?php endfor; ?>

					<h3 style="margin-top:22px;">Placement</h3>
					<p class="adslastica-help">Choose where each saved post ad appears. Each ad can be used once, for a maximum of three automatic ads per post.</p>

					<table class="adslastica-placement-table">
						<thead><tr><th>Location</th><th>Show</th></tr></thead>
						<tbody>
						<?php
						$placements = array(
							'before_post'           => 'Before post',
							'after_paragraph_2'     => 'After paragraph 2',
							'middle_post'           => 'Middle of post',
							'before_last_paragraph' => 'Before last paragraph',
							'after_post'            => 'After post',
						);
						foreach ( $placements as $placement_key => $placement_label ) :
							$saved_value = absint( get_option( 'adslastica_post_placement_' . $placement_key, 0 ) );
						?>
							<tr>
								<td><strong><?php echo esc_html( $placement_label ); ?></strong></td>
								<td>
									<select class="adslastica-placement-select" name="adslastica_post_placement_<?php echo esc_attr( $placement_key ); ?>">
										<option value="0" <?php selected( $saved_value, 0 ); ?>>None</option>
										<option value="1" <?php selected( $saved_value, 1 ); ?>>Ad 1</option>
										<option value="2" <?php selected( $saved_value, 2 ); ?>>Ad 2</option>
										<option value="3" <?php selected( $saved_value, 3 ); ?>>Ad 3</option>
									</select>
								</td>
							</tr>
						<?php endforeach; ?>
						</tbody>
					</table>

					<p class="submit"><input type="submit" class="button button-primary" value="Save Post Ads"></p>
				</form>
			</div>
		</details>
	</div>

	<script>
	jQuery(document).ready(function($) {
		$('#form-adslastica-ad-1, #form-adslastica-ad-2').on('submit', function(e) {
			e.preventDefault();
			var $form = $(this);
			var $btn = $form.find('input[type="submit"]');
			var origText = $btn.val();

			$btn.val('Saving...').prop('disabled', true);

			$.post(ajaxurl, $form.serialize(), function(response) {
				$btn.val(origText).prop('disabled', false);
				if (response.success) {
					$('#adslastica-ajax-text').text(response.data);
					$('#adslastica-ajax-msg').stop(true, true).slideDown().delay(3000).slideUp();
				}
			});
		});

		$('.adslastica-post-ad-tab').on('click', function() {
			var tab = $(this).data('adslastica-post-tab').toString();
			$('.adslastica-post-ad-tab').removeClass('is-active').attr('aria-selected', 'false');
			$(this).addClass('is-active').attr('aria-selected', 'true');
			$('.adslastica-post-ad-panel').removeClass('is-active');
			$('.adslastica-post-ad-panel[data-adslastica-post-panel="' + tab + '"]').addClass('is-active');
		});

		$('.adslastica-placement-select').on('change', function() {
			var selectedValue = $(this).val();
			if ('0' === selectedValue) return;

			$('.adslastica-placement-select').not(this).each(function() {
				if ($(this).val() === selectedValue) $(this).val('0');
			});
		});

		$('#form-adslastica-post-ads').on('submit', function(e) {
			e.preventDefault();
			var $form = $(this);
			var $btn = $form.find('input[type="submit"]');
			var origText = $btn.val();

			$btn.val('Saving...').prop('disabled', true);

			$.post(ajaxurl, $form.serialize(), function(response) {
				$btn.val(origText).prop('disabled', false);
				if (response.success) {
					$('#adslastica-post-ajax-text').text(response.data);
					$('#adslastica-post-ajax-msg').stop(true, true).slideDown().delay(3000).slideUp();
				}
			});
		});

		$('.adslastica-copy-shortcode').on('click', function() {
			var targetId = $(this).data('copy-target');
			var $input = $('#' + targetId);
			$input.select();
			document.execCommand('copy');
			
			var $btn = $(this);
			var origText = $btn.text();
			$btn.text('Copied');
			setTimeout(function() { $btn.text(origText); }, 1500);
		});
	});
	</script>
	<?php
}

function adslastica_get_post_ad_html( $ad_number ) {
	$ad_number = absint( $ad_number );
	if ( $ad_number < 1 || $ad_number > 3 ) return '';

	$code = (string) get_option( 'adslastica_post_ad_' . $ad_number, '' );
	if ( '' === trim( $code ) ) return '';

	return '<div class="adslastica-post-ad adslastica-post-ad-' . $ad_number . '" style="text-align:center; margin:20px auto; clear:both; width:100%; max-width:100%;">' . $code . '</div>';
}

function adslastica_insert_after_paragraph_index( $content, $insertions ) {
	if ( empty( $insertions ) ) return $content;

	$parts = preg_split( '/(<\/p>)/i', $content, -1, PREG_SPLIT_DELIM_CAPTURE );
	if ( ! is_array( $parts ) || count( $parts ) < 2 ) return $content;

	$paragraph_number = 0;
	$output = '';

	foreach ( $parts as $part ) {
		$output .= $part;
		if ( preg_match( '/^<\/p>$/i', $part ) ) {
			$paragraph_number++;
			if ( isset( $insertions[ $paragraph_number ] ) ) {
				$output .= implode( '', $insertions[ $paragraph_number ] );
			}
		}
	}

	return $output;
}

function adslastica_insert_post_ads( $content ) {
	if ( is_admin() || is_feed() || ! is_singular( 'post' ) || ! in_the_loop() || ! is_main_query() ) return $content;

	$locations = array(
		'before_post'           => absint( get_option( 'adslastica_post_placement_before_post', 0 ) ),
		'after_paragraph_2'     => absint( get_option( 'adslastica_post_placement_after_paragraph_2', 0 ) ),
		'middle_post'           => absint( get_option( 'adslastica_post_placement_middle_post', 0 ) ),
		'before_last_paragraph' => absint( get_option( 'adslastica_post_placement_before_last_paragraph', 0 ) ),
		'after_post'            => absint( get_option( 'adslastica_post_placement_after_post', 0 ) ),
	);

	$used_ads = array();
	foreach ( $locations as $key => $ad_number ) {
		if ( $ad_number < 1 || $ad_number > 3 || in_array( $ad_number, $used_ads, true ) ) {
			$locations[ $key ] = 0;
		} else {
			$used_ads[] = $ad_number;
		}
	}

	$before = adslastica_get_post_ad_html( $locations['before_post'] );
	$after  = adslastica_get_post_ad_html( $locations['after_post'] );

	$paragraph_count = preg_match_all( '/<\/p>/i', $content, $matches );
	$insertions = array();

	if ( $paragraph_count > 0 ) {
		if ( $locations['after_paragraph_2'] ) {
			$index = min( 2, $paragraph_count );
			$insertions[ $index ][] = adslastica_get_post_ad_html( $locations['after_paragraph_2'] );
		}

		if ( $locations['middle_post'] ) {
			$index = max( 1, (int) ceil( $paragraph_count / 2 ) );
			$insertions[ $index ][] = adslastica_get_post_ad_html( $locations['middle_post'] );
		}

		if ( $locations['before_last_paragraph'] ) {
			$index = max( 0, $paragraph_count - 1 );
			if ( 0 === $index ) {
				$before .= adslastica_get_post_ad_html( $locations['before_last_paragraph'] );
			} else {
				$insertions[ $index ][] = adslastica_get_post_ad_html( $locations['before_last_paragraph'] );
			}
		}
	}

	$content = adslastica_insert_after_paragraph_index( $content, $insertions );
	return $before . $content . $after;
}

function adslastica_shortcode_manual_ad_1() {
	if ( ! get_option( 'adslastica_manual_ad_1_enabled' ) ) return '';
	return '<div class="adslastica-ad-1" style="text-align:center; margin:20px auto; clear:both; width:100%; max-width:100%;">' . get_option( 'adslastica_manual_ad_1', '' ) . '</div>';
}

function adslastica_shortcode_manual_ad_2() {
	if ( ! get_option( 'adslastica_manual_ad_2_enabled' ) ) return '';
	return '<div class="adslastica-ad-2" style="text-align:center; margin:20px auto; clear:both; width:100%; max-width:100%;">' . get_option( 'adslastica_manual_ad_2', '' ) . '</div>';
}