<?php
/**
 * Plugin Name:       ChatX
 * Plugin URI:        https://chatx.ro/integrari/wordpress/
 * Description:       Adds the ChatX chat to your site: an AI assistant answers visitors 24/7 in their language, and you can take over the conversation from your phone at any time.
 * Version:           1.0.1
 * Requires at least: 6.3
 * Requires PHP:      7.4
 * Author:            ChatX
 * Author URI:        https://chatx.ro/
 * License:           GPLv2 or later
 * License URI:       https://www.gnu.org/licenses/gpl-2.0.html
 * Text Domain:       chatx
 */

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

define( 'CHATX_VERSION', '1.0.1' );
define( 'CHATX_OPTION', 'chatx_settings' );
define( 'CHATX_WIDGET_URL', 'https://api.chatx.ro/widget/chat-widget.min.js' );

/**
 * Saved settings, merged with defaults.
 *
 * @return array{site_id: string, enabled: bool, hide_on: string}
 */
function chatx_get_settings() {
	$saved = get_option( CHATX_OPTION, array() );
	return wp_parse_args(
		is_array( $saved ) ? $saved : array(),
		array(
			'site_id' => '',
			'enabled' => true,
			'hide_on' => '',
		)
	);
}

/* ------------------------------------------------------------------ */
/* Front end                                                          */
/* ------------------------------------------------------------------ */

/**
 * Whether the widget should load on the current request.
 */
function chatx_should_load() {
	$s = chatx_get_settings();

	if ( ! $s['enabled'] || '' === $s['site_id'] ) {
		return false;
	}

	if ( '' !== $s['hide_on'] && is_singular() ) {
		$excluded = array_filter( array_map( 'absint', explode( ',', $s['hide_on'] ) ) );
		if ( in_array( get_queried_object_id(), $excluded, true ) ) {
			return false;
		}
	}

	/**
	 * Filters whether the ChatX widget loads on the current page.
	 *
	 * @param bool $load True to load the widget.
	 */
	return (bool) apply_filters( 'chatx_should_load', true );
}

function chatx_enqueue_widget() {
	if ( ! chatx_should_load() ) {
		return;
	}

	wp_enqueue_script(
		'chatx-widget',
		CHATX_WIDGET_URL,
		array(),
		CHATX_VERSION,
		array(
			'in_footer' => true,
			'strategy'  => 'defer',
		)
	);
}
add_action( 'wp_enqueue_scripts', 'chatx_enqueue_widget' );

/**
 * The widget reads its site ID from the data-site attribute of its own script tag.
 */
function chatx_script_tag( $tag, $handle ) {
	if ( 'chatx-widget' !== $handle ) {
		return $tag;
	}

	$s = chatx_get_settings();
	return str_replace( ' src=', ' data-site="' . esc_attr( $s['site_id'] ) . '" src=', $tag );
}
add_filter( 'script_loader_tag', 'chatx_script_tag', 10, 2 );

/* ------------------------------------------------------------------ */
/* Admin                                                              */
/* ------------------------------------------------------------------ */

function chatx_admin_menu() {
	add_options_page(
		__( 'ChatX', 'chatx' ),
		__( 'ChatX', 'chatx' ),
		'manage_options',
		'chatx',
		'chatx_render_settings_page'
	);
}
add_action( 'admin_menu', 'chatx_admin_menu' );

function chatx_register_settings() {
	register_setting(
		'chatx',
		CHATX_OPTION,
		array(
			'type'              => 'array',
			'sanitize_callback' => 'chatx_sanitize_settings',
			'default'           => array(),
		)
	);
}
add_action( 'admin_init', 'chatx_register_settings' );

function chatx_sanitize_settings( $input ) {
	$input = is_array( $input ) ? $input : array();

	// Site IDs are short slugs such as "chatX" or "my-shop_2".
	$site_id = isset( $input['site_id'] ) ? sanitize_text_field( wp_unslash( $input['site_id'] ) ) : '';
	$site_id = preg_replace( '/[^A-Za-z0-9_-]/', '', $site_id );

	$exclude = isset( $input['hide_on'] ) ? sanitize_text_field( wp_unslash( $input['hide_on'] ) ) : '';
	$exclude = implode( ',', array_unique( array_filter( array_map( 'absint', explode( ',', $exclude ) ) ) ) );

	return array(
		'site_id' => substr( $site_id, 0, 64 ),
		'enabled' => ! empty( $input['enabled'] ),
		'hide_on' => $exclude,
	);
}

function chatx_render_settings_page() {
	if ( ! current_user_can( 'manage_options' ) ) {
		return;
	}
	$s = chatx_get_settings();
	?>
	<div class="wrap">
		<h1><?php esc_html_e( 'ChatX settings', 'chatx' ); ?></h1>

		<p>
			<?php esc_html_e( 'Enter the site ID you received from ChatX. The chat appears on your site as soon as you save.', 'chatx' ); ?>
			<?php
			printf(
				/* translators: %s: link to chatx.ro */
				esc_html__( 'No ID yet? Ask for a free test on %s.', 'chatx' ),
				'<a href="https://chatx.ro/#contact" target="_blank" rel="noopener">chatx.ro</a>'
			);
			?>
		</p>

		<form method="post" action="options.php">
			<?php settings_fields( 'chatx' ); ?>
			<table class="form-table" role="presentation">
				<tr>
					<th scope="row"><label for="chatx-site-id"><?php esc_html_e( 'Site ID', 'chatx' ); ?></label></th>
					<td>
						<input type="text" id="chatx-site-id" class="regular-text code"
							name="<?php echo esc_attr( CHATX_OPTION ); ?>[site_id]"
							value="<?php echo esc_attr( $s['site_id'] ); ?>"
							pattern="[A-Za-z0-9_\-]+" autocomplete="off">
						<p class="description">
							<?php esc_html_e( 'The value of data-site from the code we sent you, for example: my-site', 'chatx' ); ?>
						</p>
					</td>
				</tr>
				<tr>
					<th scope="row"><?php esc_html_e( 'Show the chat', 'chatx' ); ?></th>
					<td>
						<label>
							<input type="checkbox" name="<?php echo esc_attr( CHATX_OPTION ); ?>[enabled]" value="1" <?php checked( $s['enabled'] ); ?>>
							<?php esc_html_e( 'Enabled on the site', 'chatx' ); ?>
						</label>
					</td>
				</tr>
				<tr>
					<th scope="row"><label for="chatx-exclude"><?php esc_html_e( 'Hide on pages', 'chatx' ); ?></label></th>
					<td>
						<input type="text" id="chatx-exclude" class="regular-text"
							name="<?php echo esc_attr( CHATX_OPTION ); ?>[hide_on]"
							value="<?php echo esc_attr( $s['hide_on'] ); ?>">
						<p class="description">
							<?php esc_html_e( 'Optional. Page or post IDs, separated by commas (e.g. 12, 45).', 'chatx' ); ?>
						</p>
					</td>
				</tr>
			</table>
			<?php submit_button(); ?>
		</form>
	</div>
	<?php
}

/**
 * Settings link on the Plugins screen.
 */
function chatx_action_links( $links ) {
	$url = admin_url( 'options-general.php?page=chatx' );
	array_unshift( $links, '<a href="' . esc_url( $url ) . '">' . esc_html__( 'Settings', 'chatx' ) . '</a>' );
	return $links;
}
add_filter( 'plugin_action_links_' . plugin_basename( __FILE__ ), 'chatx_action_links' );

/**
 * Reminder until a site ID is saved, shown only where it is actionable.
 */
function chatx_admin_notice() {
	$screen = get_current_screen();
	if ( ! $screen || ! in_array( $screen->id, array( 'plugins', 'dashboard' ), true ) ) {
		return;
	}
	if ( ! current_user_can( 'manage_options' ) || '' !== chatx_get_settings()['site_id'] ) {
		return;
	}
	printf(
		'<div class="notice notice-info"><p>%s <a href="%s">%s</a></p></div>',
		esc_html__( 'ChatX is installed, but the chat will not appear until you enter your site ID.', 'chatx' ),
		esc_url( admin_url( 'options-general.php?page=chatx' ) ),
		esc_html__( 'Open settings', 'chatx' )
	);
}
add_action( 'admin_notices', 'chatx_admin_notice' );