<?php
/**
 * Assets Enqueue Handler
 *
 * Handles enqueueing of all plugin scripts and styles
 * for both editor and frontend.
 *
 * @since      1.0.0
 * @package    Acumenpopup
 * @subpackage Acumenpopup/includes/Core
 */

namespace Acumenpopup\Core;

// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Class Assets
 *
 * Manages all asset enqueueing for the plugin (Singleton).
 *
 * @since   1.0.0
 * @package Acumenpopup
 */
class Assets {

	/**
	 * The single instance of the class.
	 *
	 * @since  1.0.0
	 * @access private
	 * @var    Assets|null
	 */
	private static $instance = null;

	/**
	 * Private constructor to prevent direct instantiation.
	 *
	 * @since  1.0.0
	 * @access private
	 */
	private function __construct() {
		$this->init_hooks();
	}

	/**
	 * Get the single instance of the Assets class.
	 *
	 * @since  1.0.0
	 * @access public
	 *
	 * @return Assets The single instance.
	 */
	public static function get_instance() {
		if ( is_null( self::$instance ) ) {
			self::$instance = new self();
		}

		return self::$instance;
	}

	/**
	 * Initialize WordPress hooks for asset enqueueing.
	 *
	 * @since  1.0.0
	 * @access private
	 *
	 * @return void
	 */
	private function init_hooks() {
		// Editor Assets (priority 2 to load early).
		add_action( 'enqueue_block_editor_assets', array( $this, 'enqueue_editor_assets' ), 2 );

		// Frontend + Editor Assets.
		add_action( 'enqueue_block_assets', array( $this, 'enqueue_block_assets' ) );
	}

	/**
	 * Enqueue assets for both frontend and editor.
	 *
	 * Loads Font Awesome, Pristine validation library, and global styles.
	 *
	 * @since  1.0.0
	 * @access public
	 *
	 * @return void
	 */
	public function enqueue_block_assets() {
		// Font Awesome for icon library.
		wp_enqueue_style(
			'acumenpopup-fontawesome',
			trailingslashit( ACUMENPOPUP_URL_FILE ) . 'assets/css/fontawesome.css',
			array(),
			ACUMENPOPUP_VERSION,
			'all'
		);

		// Register Pristine validation library for form block viewScript.
		wp_register_script(
			'acumenpopup-blocks-form-validation',
			trailingslashit( ACUMENPOPUP_URL_FILE ) . 'assets/js/pristine.min.js',
			array(),
			ACUMENPOPUP_VERSION,
			true
		);

		// Localize AJAX settings for frontend form submissions.
		wp_localize_script(
			'acumenpopup-blocks-form-validation',
			'acumenpopupGLocalize',
			array(
				'ajax_url' => esc_url( admin_url( 'admin-ajax.php' ) ),
				'nonce'    => wp_create_nonce( 'acumenpopup_form_submit' ),
			)
		);

		// Global styles.
		wp_enqueue_style(
			'acumenpopup-global-styles',
			trailingslashit( ACUMENPOPUP_URL_FILE ) . 'assets/css/global.css',
			array(),
			ACUMENPOPUP_VERSION,
			'all'
		);

		// Frontend only scripts.
		if ( ! is_admin() ) {
			wp_enqueue_script(
				'acumenpopup-popup-triggers',
				trailingslashit( ACUMENPOPUP_URL_FILE ) . 'assets/js/popup-triggers.js',
				array(),
				ACUMENPOPUP_VERSION,
				true
			);

			wp_localize_script(
				'acumenpopup-popup-triggers',
				'acumenpopupTracker',
				array(
					'ajax_url' => admin_url( 'admin-ajax.php' ),
					'nonce'    => wp_create_nonce( 'acumenpopup_tracker' ),
				)
			);
		}
	}

	/**
	 * Enqueue assets for the block editor only.
	 *
	 * Loads modules and global editor scripts/styles.
	 *
	 * @since  1.0.0
	 * @access public
	 *
	 * @return void
	 */
	public function enqueue_editor_assets() {
		// Only load in admin context.
		if ( ! is_admin() ) {
			return;
		}

		// Load modules script.
		$this->enqueue_modules_script();

		// Load global script.
		$this->enqueue_global_script();
	}

	/**
	 * Enqueue the modules script and styles.
	 *
	 * @since  1.0.0
	 * @access private
	 *
	 * @return void
	 */
	private function enqueue_modules_script() {
		$asset_file = trailingslashit( ACUMENPOPUP_PLUGIN_DIR ) . 'build/modules/index.asset.php';

		if ( ! file_exists( $asset_file ) ) {
			return;
		}

		$dependencies = require $asset_file;

		wp_enqueue_script(
			'acumenpopup-modules-script',
			trailingslashit( ACUMENPOPUP_URL_FILE ) . 'build/modules/index.js',
			$dependencies['dependencies'],
			$dependencies['version'],
			false
		);

		// Localize script with theme fonts and admin email.
		wp_localize_script(
			'acumenpopup-modules-script',
			'acumenpopupParams',
			array(
				'theme_fonts' => $this->get_theme_fonts(),
				'admin_email' => sanitize_email( get_option( 'admin_email' ) ),
			)
		);
	}

	/**
	 * Enqueue the global script and styles.
	 *
	 * @since  1.0.0
	 * @access private
	 *
	 * @return void
	 */
	private function enqueue_global_script() {
		$asset_file = trailingslashit( ACUMENPOPUP_PLUGIN_DIR ) . 'build/global/index.asset.php';

		if ( ! file_exists( $asset_file ) ) {
			return;
		}

		$dependencies = require $asset_file;

		wp_enqueue_script(
			'acumenpopup-global-script',
			trailingslashit( ACUMENPOPUP_URL_FILE ) . 'build/global/index.js',
			$dependencies['dependencies'],
			ACUMENPOPUP_VERSION,
			false
		);

		wp_enqueue_style(
			'acumenpopup-global-style',
			trailingslashit( ACUMENPOPUP_URL_FILE ) . 'build/global/index.css',
			array(),
			ACUMENPOPUP_VERSION,
			'all'
		);
	}

	/**
	 * Get theme fonts from global settings.
	 *
	 * Retrieves font families defined in the theme's global settings
	 * and returns them sorted with system fonts first.
	 *
	 * @since  1.0.0
	 * @access public
	 *
	 * @return array Array of font family names.
	 */
	public function get_theme_fonts() {
		$global_settings = wp_get_global_settings();
		$global_fonts    = isset( $global_settings['typography']['fontFamilies'] )
			? $global_settings['typography']['fontFamilies']
			: array();

		if ( empty( $global_fonts ) ) {
			return array();
		}

		$theme_fonts  = array();
		$custom_fonts = array();

		// Collect theme fonts.
		if ( isset( $global_fonts['theme'] ) && ! empty( $global_fonts['theme'] ) ) {
			foreach ( $global_fonts['theme'] as $font ) {
				if ( isset( $font['name'] ) ) {
					$theme_fonts[] = sanitize_text_field( $font['name'] );
				}
			}
		}

		// Collect custom fonts.
		if ( isset( $global_fonts['custom'] ) && ! empty( $global_fonts['custom'] ) ) {
			foreach ( $global_fonts['custom'] as $font ) {
				if ( isset( $font['name'] ) ) {
					$custom_fonts[] = sanitize_text_field( $font['name'] );
				}
			}
		}

		// Merge theme and custom fonts.
		$final_fonts = array_merge( $theme_fonts, $custom_fonts );

		// Separate system fonts.
		$system_fonts = array_filter(
			$final_fonts,
			function ( $font ) {
				return false !== strpos( strtolower( $font ), 'system' );
			}
		);

		// Return with system fonts at the top.
		return array_values( array_merge( $system_fonts, array_diff( $final_fonts, $system_fonts ) ) );
	}

	/**
	 * Prevent cloning of the instance.
	 *
	 * @since  1.0.0
	 * @access public
	 *
	 * @return void
	 */
	public function __clone() {
		_doing_it_wrong(
			__FUNCTION__,
			esc_html__( 'Cloning is forbidden.', 'acumen-popup' ),
			'1.0.0'
		);
	}

	/**
	 * Prevent unserializing of the instance.
	 *
	 * @since  1.0.0
	 * @access public
	 *
	 * @return void
	 */
	public function __wakeup() {
		_doing_it_wrong(
			__FUNCTION__,
			esc_html__( 'Unserializing is forbidden.', 'acumen-popup' ),
			'1.0.0'
		);
	}
}