<?php
/**
 * Shortcode handler for rendering workflows on the frontend.
 *
 * @package BreznFlow
 * @since   1.0.0
 */

namespace BreznFlow;

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

use BreznFlow\Features\NodeTypeRegistry;
use BreznFlow\Features\ThemeRegistry;
use BreznFlow\Features\ViewCounter;
use BreznFlow\Features\InfoBoxBuilder;
use BreznFlow\Features\NodeCategorizer;
use BreznFlow\Admin\SettingsPage;

/**
 * Handles the [breznflow] shortcode, asset enqueueing, and JS data output.
 *
 * @since 1.0.0
 */
class Shortcode {
	/**
	 * Accumulated workflow data for wp_localize_script output.
	 *
	 * @var array<int, array<string, mixed>>
	 */
	private static array $render_queue = array();

	/**
	 * Whether frontend assets have been enqueued for this page load.
	 *
	 * @var bool
	 */
	private static bool $assets_enqueued = false;

	/**
	 * Registers the shortcode and footer hook.
	 *
	 * @since  1.0.0
	 * @return void
	 */
	public function register(): void {
		add_shortcode( 'breznflow', array( $this, 'render' ) );
		add_action( 'wp_footer', array( $this, 'output_script_data' ), 1 );
	}

	/**
	 * Renders the [breznflow] shortcode.
	 *
	 * @param array $atts Shortcode attributes.
	 * @return string HTML output.
	 */
	public function render( $atts ): string {
		$settings = SettingsPage::get_defaults();
		$saved    = get_option( 'breznflow_settings', array() );
		$settings = array_merge( $settings, $saved );

		$atts = shortcode_atts(
			array(
				'id'             => 0,
				'mode'           => '',
				'show_title'     => '',
				'show_infobox'   => '',
				'show_download'  => '',
				'show_minimap'   => '',
				'zoom'           => '',
				'max_code_lines' => '',
				'preset'         => '',
				'show_share'     => '',
				'show_embed'     => '',
				'show_get_json'  => '',
				'theme'          => '',
			),
			$atts,
			'breznflow'
		);

		$post_id = (int) $atts['id'];
		if ( $post_id <= 0 ) {
			return '';
		}

		$post = get_post( $post_id );
		if ( ! $post || 'breznflow_workflow' !== $post->post_type || 'publish' !== $post->post_status ) {
			return '';
		}

		$raw_json = get_post_meta( $post_id, '_breznflow_raw_json', true );
		if ( ! $raw_json ) {
			return '';
		}

		$workflow = json_decode( $raw_json, true );
		if ( ! is_array( $workflow ) ) {
			return '';
		}

		// Resolve settings from meta, overridden by shortcode attrs.
		$att_mode     = $atts['mode'];
		$meta_mode    = get_post_meta( $post_id, '_breznflow_default_mode', true );
		$mode         = $att_mode ? $att_mode : ( $meta_mode ? $meta_mode : $settings['default_mode'] );
		$mode         = in_array( $mode, array( 'visual', 'info', 'compact' ), true ) ? $mode : 'visual';
		$zoom         = '' !== $atts['zoom']
			? max( 10, min( 200, (int) $atts['zoom'] ) )
			: (int) get_post_meta( $post_id, '_breznflow_default_zoom', true );
		$show_title   = '' !== $atts['show_title']
			? (bool) $atts['show_title']
			: (bool) get_post_meta( $post_id, '_breznflow_show_title', true );
		$show_infobox = '' !== $atts['show_infobox']
			? (bool) $atts['show_infobox']
			: (bool) get_post_meta( $post_id, '_breznflow_show_infobox', true );

		// Download: shortcode can only disable if meta has it enabled (not enable if meta disables).
		$meta_download   = (bool) get_post_meta( $post_id, '_breznflow_show_download', true );
		$global_download = (bool) $settings['allow_download'];
		$allow_download  = $meta_download && $global_download;
		if ( '' !== $atts['show_download'] && ! (bool) $atts['show_download'] ) {
			$allow_download = false;
		}

		$allow_share = (bool) $settings['allow_share'];
		if ( '' !== $atts['show_share'] && ! (bool) $atts['show_share'] ) {
			$allow_share = false;
		}

		// Embed: dual-gate (global + per-post meta).
		$meta_embed  = (bool) get_post_meta( $post_id, '_breznflow_show_embed', true );
		$allow_embed = $meta_embed && (bool) $settings['allow_embed'];
		if ( '' !== $atts['show_embed'] && ! (bool) $atts['show_embed'] ) {
			$allow_embed = false;
		}

		$allow_get_json = (bool) $settings['allow_get_json'];
		if ( '' !== $atts['show_get_json'] && ! (bool) $atts['show_get_json'] ) {
			$allow_get_json = false;
		}

		$allowed_themes = ThemeRegistry::get_theme_ids();
		$att_theme      = $atts['theme'];
		$meta_theme     = get_post_meta( $post_id, '_breznflow_default_theme', true );
		$theme          = $att_theme ? $att_theme : ( $meta_theme ? $meta_theme : ( $settings['default_theme'] ?? 'dark' ) );
		$theme          = in_array( $theme, $allowed_themes, true ) ? $theme : 'dark';

		$meta_minimap = get_post_meta( $post_id, '_breznflow_show_minimap', true );
		$show_minimap = '' !== $atts['show_minimap']
			? (bool) $atts['show_minimap']
			: ( '' !== $meta_minimap ? (bool) $meta_minimap : true );

		$max_code_lines = '' !== $atts['max_code_lines'] ? max( 1, (int) $atts['max_code_lines'] ) : (int) $settings['max_code_lines'];

		// Increment view count.
		ViewCounter::increment( $post_id );

		// Enqueue assets once.
		if ( ! self::$assets_enqueued ) {
			$this->enqueue_assets( $settings );
			self::$assets_enqueued = true;
		}

		// Queue workflow data for JS output.
		self::$render_queue[] = array(
			'id'                => $post_id,
			'workflow'          => $workflow,
			'mode'              => $mode,
			'zoom'              => $zoom ? $zoom : 100,
			'autofit_threshold' => (int) ( $settings['autofit_threshold'] ?? 30 ),
			'show_title'        => $show_title,
			'show_infobox'      => $show_infobox,
			'show_download'     => $allow_download,
			'show_minimap'      => $show_minimap,
			'max_code_lines'    => $max_code_lines,
			'download_label'    => esc_html( $settings['download_label'] ),
			'download_url'      => $allow_download ? esc_url( add_query_arg( 'breznflow_download', $post_id, home_url( '/' ) ) ) : '',
			'show_share'        => $allow_share,
			'show_embed'        => $allow_embed,
			'show_get_json'     => $allow_get_json,
			'permalink'         => $allow_share ? esc_url( get_permalink() ) : '',
			'anchor_id'         => 'breznflow-' . $post_id,
			'workflow_title'    => esc_html( $post->post_title ),
			'node_count'        => (int) get_post_meta( $post_id, '_breznflow_node_count', true ),
			'is_ai_powered'     => (bool) get_post_meta( $post_id, '_breznflow_has_ai_nodes', true ),
			'blog_name'         => esc_html( get_bloginfo( 'name' ) ),
			'blog_url'          => esc_url( home_url( '/' ) ),
			'embed_url'         => $allow_embed ? esc_url( add_query_arg( 'breznflow_embed', $post_id, home_url( '/' ) ) ) : '',
			'theme'             => $theme,
		);

		// Build HTML placeholder.
		$html = '';

		if ( $show_title ) {
			$html .= '<h3 class="breznflow-title">' . esc_html( $post->post_title ) . '</h3>';
		}

		if ( 'info' === $mode ) {
			$node_summary = get_post_meta( $post_id, '_breznflow_node_summary', true );
			$node_count   = (int) get_post_meta( $post_id, '_breznflow_node_count', true );
			$has_ai       = (int) get_post_meta( $post_id, '_breznflow_has_ai_nodes', true );
			$categorized  = array(
				'counts' => (array) json_decode( $node_summary ? $node_summary : '{}', true ),
				'has_ai' => (bool) $has_ai,
				'total'  => $node_count,
			);
			$html        .= InfoBoxBuilder::build( $categorized );
		} else {
			$html .= '<div style="position:relative">'
				. '<span id="breznflow-' . esc_attr( (string) $post_id ) . '" '
				. 'aria-hidden="true" style="position:absolute;top:-60px;left:0"></span>'
				. '<div id="breznflow-wrap-' . esc_attr( (string) $post_id ) . '" '
				. 'class="breznflow-embed" data-id="' . esc_attr( (string) $post_id ) . '">'
				. '</div>'
				. '</div>';
		}

		return $html;
	}

	/**
	 * Outputs accumulated workflow data as a single wp_localize_script call.
	 * Hooked to wp_footer priority 1 (before scripts).
	 */
	public function output_script_data(): void {
		if ( empty( self::$render_queue ) ) {
			return;
		}

		wp_localize_script( 'breznflow-renderer', 'breznflowData', self::$render_queue );
		wp_localize_script( 'breznflow-renderer', 'breznflowIcons', NodeTypeRegistry::get_registry() );
		wp_localize_script( 'breznflow-renderer', 'breznflowI18n', self::get_js_i18n() );
	}

	/**
	 * Returns translatable strings for the frontend renderer JS.
	 *
	 * @return array<string, string>
	 */
	public static function get_js_i18n(): array {
		return array(
			'share'              => __( 'Share', 'breznflow' ),
			'embed'              => __( 'Embed', 'breznflow' ),
			'getJson'            => __( 'Get JSON', 'breznflow' ),
			'copy'               => __( 'Copy', 'breznflow' ),
			'copied'             => __( 'Copied!', 'breznflow' ),
			'error'              => __( 'Error', 'breznflow' ),
			'close'              => __( 'Close', 'breznflow' ),
			'zoomIn'             => __( 'Zoom in', 'breznflow' ),
			'zoomOut'            => __( 'Zoom out', 'breznflow' ),
			'resetView'          => __( 'Reset view', 'breznflow' ),
			'fullscreen'         => __( 'Fullscreen', 'breznflow' ),
			'minimap'            => __( 'Minimap', 'breznflow' ),
			'highlightInDiagram' => __( 'Highlight in diagram', 'breznflow' ),
			'articleLink'        => __( 'Article Link', 'breznflow' ),
			'anchorLink'         => __( 'Workflow Anchor Link', 'breznflow' ),
			'embedDesc'          => __( 'Embed this workflow on any website:', 'breznflow' ),
			'optionalParams'     => __( 'Optional URL parameters:', 'breznflow' ),
			'code'               => __( 'Code', 'breznflow' ),
			'credential'         => __( 'Credential', 'breznflow' ),
			'type'               => __( 'Type', 'breznflow' ),
			'aiPowered'          => __( 'AI-powered', 'breznflow' ),
			'more'               => __( 'more', 'breznflow' ),
			'node'               => __( 'node', 'breznflow' ),
			'nodes'              => __( 'nodes', 'breznflow' ),
			'line'               => __( 'line', 'breznflow' ),
			'lines'              => __( 'lines', 'breznflow' ),
		);
	}

	/**
	 * Outputs Schema.org HowTo structured data if enabled.
	 */
	public function maybe_output_schema(): void {
		if ( ! is_singular() ) {
			return;
		}

		$settings = get_option( 'breznflow_settings', array() );
		if ( empty( $settings['schema_howto'] ) ) {
			return;
		}

		// Schema output is handled per-shortcode; here we hook for future expansion.
	}

	/**
	 * Enqueues renderer assets.
	 *
	 * @since 1.0.0
	 * @param array $settings Plugin settings array (reserved for future use).
	 * @return void
	 */
	private function enqueue_assets( array $settings ): void {
		wp_enqueue_style( 'breznflow-renderer', BREZNFLOW_URL . 'assets/renderer.css', array(), BREZNFLOW_VERSION );
		wp_enqueue_script( 'breznflow-renderer', BREZNFLOW_URL . 'assets/renderer.js', array(), BREZNFLOW_VERSION, true );

		// Enqueue built-in theme CSS files.
		foreach ( ThemeRegistry::BUILTIN as $id => $name ) {
			wp_enqueue_style(
				'breznflow-theme-' . $id,
				ThemeRegistry::get_builtin_url( $id ),
				array( 'breznflow-renderer' ),
				BREZNFLOW_VERSION
			);
		}

		// Output custom themes as inline CSS.
		$custom_css = ThemeRegistry::get_custom_theme_css();
		if ( $custom_css ) {
			wp_add_inline_style( 'breznflow-renderer', $custom_css );
		}
	}
}