<?php
/**
 * Plugin Name: AiMaxChat
 * Plugin URI: https://aimaxchat.ru
 * Description: Connects the AiMaxChat widget to your WordPress site with bot-specific public settings.
 * Version: 0.1.1
 * Requires at least: 6.4
 * Requires PHP: 8.1
 * Author: AiMaxChat
 * Text Domain: aimaxchat
 * License: GPLv2 or later
 * License URI: https://www.gnu.org/licenses/gpl-2.0.html
 *
 * @package AiMaxChat
 */

defined( 'ABSPATH' ) || exit;

define( 'AIMAXCHAT_PLUGIN_VERSION', '0.1.1' );
define( 'AIMAXCHAT_OPTION_NAME', 'aimaxchat_options' );
define( 'AIMAXCHAT_SETTINGS_GROUP', 'aimaxchat_settings_group' );
define( 'AIMAXCHAT_SETTINGS_PAGE', 'aimaxchat_settings' );
define( 'AIMAXCHAT_SCRIPT_HANDLE', 'aimaxchat-widget' );

/**
 * Return default plugin options.
 *
 * @return array<string, mixed>
 */
function aimaxchat_default_options() {
	return array(
		'enabled'       => false,
		'botId'         => '',
		'publicToken'   => '',
		'apiUrl'        => '',
		'widgetCdnUrl'  => '',
	);
}

/**
 * Fetch plugin options with defaults.
 *
 * @return array<string, mixed>
 */
function aimaxchat_get_options() {
	$options = get_option( AIMAXCHAT_OPTION_NAME, array() );

	if ( ! is_array( $options ) ) {
		$options = array();
	}

	return wp_parse_args( $options, aimaxchat_default_options() );
}

/**
 * Check whether the given value is UUID-like.
 *
 * @param string $value Value to validate.
 * @return bool
 */
function aimaxchat_is_uuid_like( $value ) {
	return 1 === preg_match( '/^[0-9a-f]{8}-[0-9a-f]{4}-[1-5][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i', $value );
}

/**
 * Validate public token.
 *
 * @param string $value Token value.
 * @return bool
 */
function aimaxchat_is_valid_public_token( $value ) {
	return 1 === preg_match( '/^[A-Za-z0-9_-]{16,255}$/', $value );
}

/**
 * Sanitize plugin options.
 *
 * @param mixed $input Raw form input.
 * @return array<string, mixed>
 */
function aimaxchat_sanitize_options( $input ) {
	$defaults = aimaxchat_default_options();
	$input    = is_array( $input ) ? $input : array();
	$output   = $defaults;

	$output['enabled'] = ! empty( $input['enabled'] );

	$bot_id = trim( (string) ( $input['botId'] ?? '' ) );
	if ( '' !== $bot_id && ! aimaxchat_is_uuid_like( $bot_id ) ) {
		add_settings_error( AIMAXCHAT_OPTION_NAME, 'aimaxchat_bot_id', 'Bot ID должен быть корректным UUID.' );
	} else {
		$output['botId'] = $bot_id;
	}

	$public_token = trim( (string) ( $input['publicToken'] ?? '' ) );
	if ( '' !== $public_token && ! aimaxchat_is_valid_public_token( $public_token ) ) {
		add_settings_error( AIMAXCHAT_OPTION_NAME, 'aimaxchat_public_token', 'Public Token содержит недопустимые символы или длину.' );
	} else {
		$output['publicToken'] = $public_token;
	}

	$api_url = trim( (string) ( $input['apiUrl'] ?? '' ) );
	if ( '' !== $api_url ) {
		$api_url = esc_url_raw( $api_url );
		if ( ! wp_http_validate_url( $api_url ) || ! preg_match( '#^https?://#i', $api_url ) ) {
			add_settings_error( AIMAXCHAT_OPTION_NAME, 'aimaxchat_api_url', 'API URL должен быть корректным http/https адресом.' );
		} else {
			$output['apiUrl'] = untrailingslashit( $api_url );
		}
	}

	$widget_cdn_url = trim( (string) ( $input['widgetCdnUrl'] ?? '' ) );
	if ( '' !== $widget_cdn_url ) {
		$widget_cdn_url = esc_url_raw( $widget_cdn_url );
		if ( ! wp_http_validate_url( $widget_cdn_url ) || ! preg_match( '#^https?://#i', $widget_cdn_url ) ) {
			add_settings_error( AIMAXCHAT_OPTION_NAME, 'aimaxchat_widget_cdn_url', 'Widget CDN URL должен быть корректным http/https адресом.' );
		} else {
			$output['widgetCdnUrl'] = $widget_cdn_url;
		}
	}

	return $output;
}

/**
 * Register plugin settings.
 *
 * @return void
 */
function aimaxchat_register_settings() {
	register_setting(
		AIMAXCHAT_SETTINGS_GROUP,
		AIMAXCHAT_OPTION_NAME,
		array(
			'type'              => 'array',
			'sanitize_callback' => 'aimaxchat_sanitize_options',
			'default'           => aimaxchat_default_options(),
		)
	);

	add_settings_section(
		'aimaxchat_main_section',
		'AiMaxChat',
		'aimaxchat_render_settings_intro',
		AIMAXCHAT_SETTINGS_PAGE
	);

	add_settings_field(
		'aimaxchat_enabled',
		'Включить виджет',
		'aimaxchat_render_checkbox_field',
		AIMAXCHAT_SETTINGS_PAGE,
		'aimaxchat_main_section',
		array(
			'id'          => 'enabled',
			'label'       => 'Подключать виджет на публичных страницах WordPress.',
			'description' => 'После сохранения проверьте публичную страницу сайта, а не только админку.',
		)
	);

	add_settings_field(
		'aimaxchat_bot_id',
		'Bot ID',
		'aimaxchat_render_text_field',
		AIMAXCHAT_SETTINGS_PAGE,
		'aimaxchat_main_section',
		array(
			'id'          => 'botId',
			'placeholder' => 'xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx',
			'description' => 'UUID бота из AiMaxChat.',
		)
	);

	add_settings_field(
		'aimaxchat_public_token',
		'Public Token',
		'aimaxchat_render_text_field',
		AIMAXCHAT_SETTINGS_PAGE,
		'aimaxchat_main_section',
		array(
			'id'          => 'publicToken',
			'placeholder' => 'xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx',
			'description' => 'Публичный токен бота из AiMaxChat.',
		)
	);

	add_settings_field(
		'aimaxchat_api_url',
		'API URL',
		'aimaxchat_render_text_field',
		AIMAXCHAT_SETTINGS_PAGE,
		'aimaxchat_main_section',
		array(
			'id'          => 'apiUrl',
			'placeholder' => 'https://api.aimaxchat.ru',
			'description' => 'Публичный backend API URL без закрывающего слеша.',
		)
	);

	add_settings_field(
		'aimaxchat_widget_cdn_url',
		'Widget CDN URL',
		'aimaxchat_render_text_field',
		AIMAXCHAT_SETTINGS_PAGE,
		'aimaxchat_main_section',
		array(
			'id'          => 'widgetCdnUrl',
			'placeholder' => 'https://cdn.aimaxchat.ru/widget/latest/widget.js',
			'description' => 'Публичный CDN URL на widget.js.',
		)
	);
}
add_action( 'admin_init', 'aimaxchat_register_settings' );

/**
 * Add plugin settings page.
 *
 * @return void
 */
function aimaxchat_add_settings_page() {
	add_options_page(
		'AiMaxChat',
		'AiMaxChat',
		'manage_options',
		AIMAXCHAT_SETTINGS_PAGE,
		'aimaxchat_render_settings_page'
	);
}
add_action( 'admin_menu', 'aimaxchat_add_settings_page' );

/**
 * Render intro text.
 *
 * @return void
 */
function aimaxchat_render_settings_intro() {
	echo '<p>Скопируйте параметры из личного кабинета AiMaxChat. Внешний вид и сценарии остаются в AiMaxChat и не требуют переустановки плагина.</p>';
}

/**
 * Render a checkbox field.
 *
 * @param array<string, string> $args Field arguments.
 * @return void
 */
function aimaxchat_render_checkbox_field( $args ) {
	$options = aimaxchat_get_options();
	$id      = $args['id'];
	$checked = ! empty( $options[ $id ] );
	?>
	<label for="<?php echo esc_attr( 'aimaxchat_' . $id ); ?>">
		<input
			id="<?php echo esc_attr( 'aimaxchat_' . $id ); ?>"
			name="<?php echo esc_attr( AIMAXCHAT_OPTION_NAME . '[' . $id . ']' ); ?>"
			type="checkbox"
			value="1"
			<?php checked( $checked ); ?>
		/>
		<?php echo esc_html( $args['label'] ?? '' ); ?>
	</label>
	<?php if ( ! empty( $args['description'] ) ) : ?>
		<p class="description"><?php echo esc_html( $args['description'] ); ?></p>
	<?php endif; ?>
	<?php
}

/**
 * Render a text field.
 *
 * @param array<string, string> $args Field arguments.
 * @return void
 */
function aimaxchat_render_text_field( $args ) {
	$options     = aimaxchat_get_options();
	$id          = $args['id'];
	$value       = isset( $options[ $id ] ) ? (string) $options[ $id ] : '';
	$placeholder = $args['placeholder'] ?? '';
	?>
	<input
		id="<?php echo esc_attr( 'aimaxchat_' . $id ); ?>"
		name="<?php echo esc_attr( AIMAXCHAT_OPTION_NAME . '[' . $id . ']' ); ?>"
		type="text"
		class="regular-text code"
		value="<?php echo esc_attr( $value ); ?>"
		placeholder="<?php echo esc_attr( $placeholder ); ?>"
		autocomplete="off"
		spellcheck="false"
	/>
	<?php if ( ! empty( $args['description'] ) ) : ?>
		<p class="description"><?php echo esc_html( $args['description'] ); ?></p>
	<?php endif; ?>
	<?php
}

/**
 * Render plugin settings page.
 *
 * @return void
 */
function aimaxchat_render_settings_page() {
	if ( ! current_user_can( 'manage_options' ) ) {
		return;
	}
	?>
	<div class="wrap">
		<h1>AiMaxChat</h1>
		<form action="options.php" method="post">
			<?php
			settings_fields( AIMAXCHAT_SETTINGS_GROUP );
			do_settings_sections( AIMAXCHAT_SETTINGS_PAGE );
			submit_button( 'Сохранить настройки' );
			?>
		</form>
	</div>
	<?php
}

/**
 * Enqueue widget script on public pages.
 *
 * @return void
 */
function aimaxchat_enqueue_widget() {
	if ( is_admin() ) {
		return;
	}

	$options = aimaxchat_get_options();

	if (
		empty( $options['enabled'] ) ||
		empty( $options['botId'] ) ||
		empty( $options['publicToken'] ) ||
		empty( $options['apiUrl'] ) ||
		empty( $options['widgetCdnUrl'] )
	) {
		return;
	}

	wp_enqueue_script(
		AIMAXCHAT_SCRIPT_HANDLE,
		$options['widgetCdnUrl'],
		array(),
		null,
		true
	);

	$payload = array(
		'botId'       => (string) $options['botId'],
		'publicToken' => (string) $options['publicToken'],
		'apiUrl'      => (string) $options['apiUrl'],
	);

	$json = wp_json_encode( $payload, JSON_HEX_TAG | JSON_HEX_AMP | JSON_HEX_APOS | JSON_HEX_QUOT );
	if ( ! $json ) {
		return;
	}

	$inline_script = 'if (window.AiMaxChat && typeof window.AiMaxChat.init === "function") { window.AiMaxChat.init(' . $json . '); }';
	wp_add_inline_script( AIMAXCHAT_SCRIPT_HANDLE, $inline_script, 'after' );
}
add_action( 'wp_enqueue_scripts', 'aimaxchat_enqueue_widget' );