<?php
/**
 * Helper utilities for Solutiontech Whatsapp.
 *
 * @package Solutiontech_WhatsApp
 */

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

/**
 * Class Solutiontech_WhatsApp_Helpers
 */
class Solutiontech_WhatsApp_Helpers {

	/**
	 * Get all plugin settings merged with sensible defaults.
	 *
	 * @return array
	 */
	public static function get_settings() {
		$defaults = array(
			// General.
			'enabled'                => '1',
			'phone_number'           => '',
			'agent_name'             => 'Equipo de Soporte',
			'agent_role'             => 'Suele responder en pocos minutos',
			'default_message'        => '¡Hola! Me gustaría recibir más información sobre {page_title}. Enlace: {page_url}',
			'multi_agent'            => '0',
			'agents'                 => array(),
			// Popup.
			'popup_enabled'          => '1',
			'popup_title'            => 'Inicia una conversación',
			'popup_intro'            => '¡Hola! ¿Cómo podemos ayudarte hoy? Escríbenos directamente a WhatsApp.',
			'btn_cta_text'           => 'Chatear por WhatsApp',
			// Design.
			'position'               => 'bottom-right',
			'offset_x'               => '20',
			'offset_y'               => '20',
			'layout_type'            => 'button_text',
			'btn_text'               => '¿Necesitas ayuda?',
			'primary_color'          => '#25D366',
			'header_color'           => '#075E54',
			'animation'              => 'pulse',
			'device_visibility'      => 'all',
			'hide_on_pages'          => array(),
			// WooCommerce.
			'woo_enabled'            => '1',
			'woo_btn_position'       => 'woocommerce_after_add_to_cart_button',
			'woo_btn_text'           => 'Pedir por WhatsApp',
			'woo_message'            => '¡Hola! Me interesa comprar "{product_name}" (SKU: {product_sku}, Precio: {product_price}). Enlace: {product_url}',
			'woo_cart_enabled'       => '1',
			'woo_cart_btn_text'      => 'Hacer consulta sobre mi carrito',
			// Analytics.
			'track_ga4'              => '1',
			'track_pixel'            => '1',
			// Feature 1: Notification Badge.
			'badge_enabled'          => '1',
			'badge_delay'            => '3',
			// Feature 2: Smart Triggers.
			'auto_open_delay'        => '0', // 0 = disabled.
			'scroll_trigger'         => '0',
			'scroll_percent'         => '50',
			'exit_intent'            => '0',
			// Feature 3: Business Hours.
			'business_hours_enabled' => '0',
			'business_days'          => array( 'mon', 'tue', 'wed', 'thu', 'fri' ),
			'business_start'         => '09:00',
			'business_end'           => '18:00',
			'offline_behavior'       => 'offline_notice', // offline_notice or hide_widget.
			'offline_status_text'    => 'Fuera de horario laboral',
			'offline_notice'         => 'En este momento estamos fuera de horario comercial. Envíanos tu consulta y te responderemos a primera hora.',
			// Feature 4: Desktop QR Code.
			'qr_enabled'             => '1',
			// Feature 5: Privacy / GDPR.
			'gdpr_enabled'           => '0',
			'gdpr_text'              => 'Acepto la política de privacidad y el contacto vía WhatsApp.',
			// Feature 6: Notification Sound.
			'sound_enabled'          => '1',
		);

		$saved = get_option( 'st_wa_settings', array() );
		return wp_parse_args( $saved, $defaults );
	}

	/**
	 * Sanitize phone number to international numeric format (digits only).
	 *
	 * @param string $phone Raw phone string.
	 * @return string Digits only.
	 */
	public static function clean_phone( $phone ) {
		return preg_replace( '/[^0-9]/', '', (string) $phone );
	}

	/**
	 * Build WhatsApp link.
	 *
	 * @param string $phone Clean phone digits.
	 * @param string $message Plain text message.
	 * @return string WhatsApp URL.
	 */
	public static function build_whatsapp_url( $phone, $message = '' ) {
		$clean_phone = self::clean_phone( $phone );
		$url         = 'https://wa.me/' . $clean_phone;

		if ( ! empty( $message ) ) {
			$url = add_query_arg( 'text', rawurlencode( $message ), $url );
		}

		return esc_url_raw( $url );
	}

	/**
	 * Replace dynamic placeholders in messages.
	 *
	 * @param string $message Message template.
	 * @param array  $custom_tags Additional key => value replacements.
	 * @return string Processed text.
	 */
	public static function replace_tags( $message, $custom_tags = array() ) {
		$page_title = wp_title( '', false );
		if ( is_front_page() || is_home() ) {
			$page_title = get_bloginfo( 'name' );
		} elseif ( empty( $page_title ) && is_singular() ) {
			$page_title = get_the_title();
		}

		$current_url = home_url( add_query_arg( array(), $GLOBALS['wp']->request ?? '' ) );

		$defaults = array(
			'{site_name}'   => get_bloginfo( 'name' ),
			'{page_title}'  => trim( $page_title ),
			'{page_url}'    => esc_url( $current_url ),
		);

		$tags = array_merge( $defaults, $custom_tags );

		return str_replace( array_keys( $tags ), array_values( $tags ), $message );
	}

	/**
	 * Check whether the current time is within configured business hours.
	 *
	 * @param array $settings Plugin settings.
	 * @return bool True if online, false if offline.
	 */
	public static function is_within_business_hours( $settings ) {
		if ( empty( $settings['business_hours_enabled'] ) || '1' !== $settings['business_hours_enabled'] ) {
			return true;
		}

		$timezone = wp_timezone();
		$now = new DateTime( 'now', $timezone );
		$current_day = strtolower( $now->format( 'D' ) ); // mon, tue, wed, thu, fri, sat, sun.

		$active_days = ! empty( $settings['business_days'] ) && is_array( $settings['business_days'] )
			? $settings['business_days']
			: array( 'mon', 'tue', 'wed', 'thu', 'fri' );

		if ( ! in_array( $current_day, $active_days, true ) ) {
			return false;
		}

		$start = ! empty( $settings['business_start'] ) ? $settings['business_start'] : '09:00';
		$end   = ! empty( $settings['business_end'] ) ? $settings['business_end'] : '18:00';

		$current_time = $now->format( 'H:i' );

		return ( $current_time >= $start && $current_time <= $end );
	}

	/**
	 * Get the SVG code for WhatsApp icon.
	 *
	 * @return string Raw SVG.
	 */
	public static function get_whatsapp_icon_svg() {
		return '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 448 512" width="24" height="24" aria-hidden="true" focusable="false" fill="currentColor"><path d="M380.9 97.1C339 55.1 283.2 32 223.9 32c-122.4 0-222 99.6-222 222 0 39.1 10.2 77.3 29.6 111L0 480l117.7-30.9c32.4 17.7 68.9 27 106.1 27h.1c122.3 0 224.1-99.6 224.1-222 0-59.3-25.2-115-67.1-157zm-157 341.6c-33.2 0-65.7-8.9-94-25.7l-6.7-4-69.8 18.3L72 359.2l-4.4-7c-18.5-29.4-28.2-63.3-28.2-98.2 0-101.7 82.8-184.5 184.6-184.5 49.3 0 95.6 19.2 130.4 54.1 34.8 34.9 56.2 81.2 56.1 130.5 0 101.8-84.9 184.6-186.6 184.6zm101.2-138.2c-5.5-2.8-32.8-16.2-37.9-18-5.1-1.9-8.8-2.8-12.5 2.8-3.7 5.6-14.3 18-17.6 21.8-3.2 3.7-6.5 4.2-12 1.4-32.6-16.3-54-29.1-75.5-66-5.7-9.8 5.7-9.1 16.3-30.3 1.8-3.7.9-6.9-.5-9.7-1.4-2.8-12.5-30.1-17.1-41.2-4.5-10.8-9.1-9.3-12.5-9.5-3.2-.2-6.9-.2-10.6-.2-3.7 0-9.7 1.4-14.8 6.9-5.1 5.6-19.4 19-19.4 46.3 0 27.3 19.9 53.7 22.6 57.4 2.8 3.7 39.1 59.7 94.8 83.8 35.2 15.2 49 16.5 66.6 13.9 10.7-1.6 32.8-13.4 37.4-26.4 4.6-13 4.6-24.1 3.2-26.4-1.3-2.5-5-3.9-10.5-6.6z"/></svg>';
	}
}