<?php
/**
 * Front-end shortcode [aha_hero_slider].
 *
 * @package AHA_Hero_Slider
 * @since   1.0.0
 */

if ( ! defined( 'WPINC' ) ) {
	die;
}

/**
 * Shortcode handler.
 */
class AHA_Hero_Slider_Shortcode {

	/**
	 * Instance.
	 *
	 * @var self|null
	 */
	private static $instance = null;

	/**
	 * Get instance.
	 *
	 * @return self
	 */
	public static function get_instance() {
		if ( null === self::$instance ) {
			self::$instance = new self();
		}
		return self::$instance;
	}

	/**
	 * Constructor.
	 */
	public function __construct() {
		add_shortcode( 'aha_hero_slider', array( $this, 'render_shortcode' ) );
	}

	/**
	 * Shortcode callback.
	 *
	 * @param array<string, string>|string $atts Attributes.
	 * @return string
	 */
	public function render_shortcode( $atts ) {
		if ( ! aha_hero_slider_should_render_slider_output() ) {
			return '';
		}

		if ( ! aha_hero_slider_is_cpt_enabled() ) {
			return '';
		}

		$atts = AHA_Hero_Slider_Shortcode_Attributes::parse( $atts );

		$transition_mode = aha_hero_slider_sanitize_transition_mode( (string) $atts['transition'] );
		$progress_mode   = aha_hero_slider_sanitize_progress_mode( (string) $atts['progress'] );

		$infinite_raw   = strtolower( trim( (string) $atts['infinite'] ) );
		$infinite_mode  = 'loop';
		if ( in_array( $infinite_raw, array( 'no', '0', 'false', 'off' ), true ) ) {
			$infinite_mode = 'finite';
		} elseif ( 'seamless' === $infinite_raw ) {
			$infinite_mode = 'seamless';
		}

		wp_enqueue_style( 'aha-hero-slider-main' );
		wp_enqueue_script( AHA_Hero_Slider_Assets::SCRIPT_MAIN );

		$global_css = aha_hero_slider_get_global_styles_css();
		if ( $global_css ) {
			wp_add_inline_style( 'aha-hero-slider-main', wp_strip_all_tags( $global_css ) );
		}

		$query_args = array();
		if ( isset( $atts['group'] ) && trim( (string) $atts['group'] ) !== '' ) {
			$query_args['group'] = $atts['group'];
		}

		$posts  = aha_hero_slider_get_cpt_slides( $query_args );
		$slides = array();
		foreach ( $posts as $p ) {
			if ( $p instanceof WP_Post ) {
				$slides[] = aha_hero_slider_slide_from_post( $p );
			}
		}

		/**
		 * Filter slides for shortcode output.
		 *
		 * @since 1.0.0
		 *
		 * @param array<int, array<string, mixed>> $slides Slides.
		 */
		$slides = apply_filters( 'aha_hero_slider_shortcode_slides', $slides );

		if ( empty( $slides ) ) {
			return '';
		}

		$instance_css_vars = aha_hero_slider_instance_css_vars_from_shortcode_atts( $atts );

		$slider_id = ! empty( $atts['id'] ) 
			? sanitize_html_class( 'aha-hero-slider-' . $atts['id'] ) 
			: 'aha-hero-slider-' . wp_unique_id();

		$config = array(
			'autoplay_speed'    => max( 0, (int) $atts['autoplay_speed'] ),
			'show_arrows'       => $atts['arrows'] === 'yes',
			'border_radius'     => max( 0, min( 100, (int) $atts['radius'] ) ),
			'transition'        => $transition_mode,
			'infinite'          => $infinite_mode,
			'progress'          => $progress_mode,
			'title_tag'         => (string) $atts['title_tag'],
			'instance_css_vars' => $instance_css_vars,
		);

		/**
		 * Filter slider render config (per shortcode instance).
		 *
		 * Core keys are normalized; add-ons may merge extra keys for templates or scripts.
		 *
		 * @since 1.0.0
		 *
		 * @param array<string, mixed>              $config Render config.
		 * @param array<string, string>           $atts   Parsed shortcode attributes.
		 * @param array<int, array<string, mixed>> $slides Slide data.
		 */
		$config = apply_filters( 'aha_hero_slider_render_config', $config, $atts, $slides );

		ob_start();
		aha_hero_slider_render( $slides, $slider_id, $config );
		return (string) ob_get_clean();
	}
}