<?php
/**
 * Categorizes workflow nodes by type and detects AI nodes.
 *
 * @package BreznFlow
 * @since   1.0.0
 */

namespace BreznFlow\Features;

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

/**
 * Categorizes n8n workflow nodes by type (trigger, action, AI, etc.).
 *
 * @since 1.0.0
 */
class NodeCategorizer {
	/** Keywords indicating AI-related nodes. */
	const AI_KEYWORDS = array(
		'openai',
		'anthropic',
		'claude',
		'gemini',
		'googleai',
		'huggingface',
		'langchain',
		'agent',
		'vectorstore',
		'gpt',
		'ollama',
		'mistral',
		'cohere',
		'lmchat',
		'chainllm',
		'memorybuffer',
	);

	/**
	 * Categorizes nodes and computes counts.
	 *
	 * @param array $nodes Array of node objects from workflow data.
	 * @return array{counts: array, by_category: array, ai_nodes: array, has_ai: bool, total: int}
	 */
	public static function categorize( array $nodes ): array {
		$counts      = array();
		$by_category = array();
		$ai_nodes    = array();

		foreach ( $nodes as $node ) {
			$type  = isset( $node['type'] ) ? (string) $node['type'] : '';
			$slug  = NodeTypeRegistry::extract_slug( $type );
			$entry = NodeTypeRegistry::lookup( $type );
			$label = $entry['label'] ?? $slug;

			// Count by display label.
			if ( ! isset( $counts[ $label ] ) ) {
				$counts[ $label ] = 0;
			}
			++$counts[ $label ];

			// Check for AI nodes.
			$slug_lower = strtolower( $slug );
			foreach ( self::AI_KEYWORDS as $keyword ) {
				if ( str_contains( $slug_lower, $keyword ) ) {
					if ( ! in_array( $type, $ai_nodes, true ) ) {
						$ai_nodes[] = $type;
					}
					break;
				}
			}

			// Group by category.
			$category = self::get_category( $slug );
			if ( ! isset( $by_category[ $category ] ) ) {
				$by_category[ $category ] = array();
			}
			$by_category[ $category ][] = $label;
		}

		arsort( $counts );

		return array(
			'counts'      => $counts,
			'by_category' => $by_category,
			'ai_nodes'    => $ai_nodes,
			'has_ai'      => ! empty( $ai_nodes ),
			'total'       => count( $nodes ),
		);
	}

	/**
	 * Determines the category for a node slug.
	 *
	 * @since 1.0.0
	 * @param string $slug Node type slug.
	 * @return string Category name.
	 */
	private static function get_category( string $slug ): string {
		$slug_lower = strtolower( $slug );

		// AI check first.
		foreach ( self::AI_KEYWORDS as $keyword ) {
			if ( str_contains( $slug_lower, $keyword ) ) {
				return 'ai';
			}
		}

		$trigger_slugs = array( 'scheduletrigger', 'webhook', 'manualtrigger', 'formtrigger', 'emailreadimap', 'rssfeadread' );
		foreach ( $trigger_slugs as $t ) {
			if ( str_contains( $slug_lower, 'trigger' ) || str_contains( $slug_lower, 'webhook' ) ) {
				return 'trigger';
			}
		}

		$logic_slugs = array(
			'if',
			'switch',
			'filter',
			'merge',
			'splitinbatches',
			'splitout',
			'sort',
			'limit',
			'removeduplicates',
			'aggregate',
			'comparedatasets',
		);
		foreach ( $logic_slugs as $l ) {
			if ( $slug_lower === $l ) {
				return 'logic';
			}
		}

		$code_slugs = array(
			'code',
			'function',
			'executeworkflow',
			'set',
			'editfields',
			'html',
			'xml',
			'markdown',
			'crypto',
			'tofile',
			'converttofile',
			'extractfromfile',
		);
		foreach ( $code_slugs as $c ) {
			if ( $slug_lower === $c ) {
				return 'transform';
			}
		}

		$db_slugs = array( 'mysql', 'postgres', 'redis', 'mongodb', 'sqlite', 'microsoftsql', 'supabase' );
		foreach ( $db_slugs as $d ) {
			if ( $slug_lower === $d ) {
				return 'database';
			}
		}

		return 'action';
	}
}