<?php
/**
 * Registry of known n8n node types with display metadata.
 *
 * @package BreznFlow
 * @since   1.0.0
 */

namespace BreznFlow\Features;

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

/**
 * Registry of known n8n node types with their display metadata.
 *
 * @since 1.0.0
 */
class NodeTypeRegistry {
	/**
	 * Returns the full node type registry.
	 * Keys are n8n node slugs (part after last dot in type string).
	 *
	 * @return array<string, array{label: string, icon: string, symbol?: string, color: string, bg: string}>
	 */
	public static function get_registry(): array {
		return array(
			// Triggers.
			'scheduleTrigger'    => array(
				'label'  => 'Schedule Trigger',
				'icon'   => 'symbol',
				'symbol' => '⏰',
				'color'  => '#31C48D',
				'bg'     => '#1a3a2e',
			),
			'webhook'            => array(
				'label'  => 'Webhook',
				'icon'   => 'symbol',
				'symbol' => '⇆',
				'color'  => '#5277D4',
				'bg'     => '#1a2040',
			),
			'manualTrigger'      => array(
				'label'  => 'Manual Trigger',
				'icon'   => 'symbol',
				'symbol' => '▶',
				'color'  => '#FF6B35',
				'bg'     => '#3a1a00',
			),
			'formTrigger'        => array(
				'label'  => 'Form Trigger',
				'icon'   => 'symbol',
				'symbol' => '▤',
				'color'  => '#9B59B6',
				'bg'     => '#2a1040',
			),
			'emailReadImap'      => array(
				'label'  => 'Email (IMAP)',
				'icon'   => 'symbol',
				'symbol' => '✉',
				'color'  => '#E74C3C',
				'bg'     => '#3a1010',
			),
			'respondToWebhook'   => array(
				'label'  => 'Respond to Webhook',
				'icon'   => 'symbol',
				'symbol' => '↩',
				'color'  => '#5277D4',
				'bg'     => '#1a2040',
			),

			// Core logic.
			'code'               => array(
				'label'  => 'Code',
				'icon'   => 'symbol',
				'symbol' => '{ }',
				'color'  => '#FF9500',
				'bg'     => '#3a2000',
			),
			'function'           => array(
				'label'  => 'Function',
				'icon'   => 'symbol',
				'symbol' => 'ƒ',
				'color'  => '#FF9500',
				'bg'     => '#3a2000',
			),
			'executeWorkflow'    => array(
				'label'  => 'Execute Workflow',
				'icon'   => 'symbol',
				'symbol' => '↺',
				'color'  => '#7F8C8D',
				'bg'     => '#2d2d2d',
			),
			'httpRequest'        => array(
				'label'  => 'HTTP Request',
				'icon'   => 'symbol',
				'symbol' => '⊕',
				'color'  => '#5277D4',
				'bg'     => '#1a2040',
			),
			'wait'               => array(
				'label'  => 'Wait',
				'icon'   => 'symbol',
				'symbol' => 'II',
				'color'  => '#9B59B6',
				'bg'     => '#2a1040',
			),
			'if'                 => array(
				'label'  => 'If',
				'icon'   => 'symbol',
				'symbol' => '?',
				'color'  => '#F39C12',
				'bg'     => '#3a2800',
			),
			'switch'             => array(
				'label'  => 'Switch',
				'icon'   => 'symbol',
				'symbol' => '⋈',
				'color'  => '#F39C12',
				'bg'     => '#3a2800',
			),
			'merge'              => array(
				'label'  => 'Merge',
				'icon'   => 'symbol',
				'symbol' => '⊕',
				'color'  => '#26C6DA',
				'bg'     => '#003040',
			),
			'splitInBatches'     => array(
				'label'  => 'Split in Batches',
				'icon'   => 'symbol',
				'symbol' => '⋮',
				'color'  => '#95A5A6',
				'bg'     => '#2d2d2d',
			),
			'set'                => array(
				'label'  => 'Set',
				'icon'   => 'symbol',
				'symbol' => '=',
				'color'  => '#26C6DA',
				'bg'     => '#003040',
			),
			'editFields'         => array(
				'label'  => 'Edit Fields',
				'icon'   => 'symbol',
				'symbol' => '=',
				'color'  => '#26C6DA',
				'bg'     => '#003040',
			),
			'filter'             => array(
				'label'  => 'Filter',
				'icon'   => 'symbol',
				'symbol' => '▽',
				'color'  => '#95A5A6',
				'bg'     => '#2d2d2d',
			),
			'aggregate'          => array(
				'label'  => 'Aggregate',
				'icon'   => 'symbol',
				'symbol' => '∑',
				'color'  => '#26C6DA',
				'bg'     => '#003040',
			),
			'splitOut'           => array(
				'label'  => 'Split Out',
				'icon'   => 'symbol',
				'symbol' => '↔',
				'color'  => '#95A5A6',
				'bg'     => '#2d2d2d',
			),
			'sort'               => array(
				'label'  => 'Sort',
				'icon'   => 'symbol',
				'symbol' => '↕',
				'color'  => '#95A5A6',
				'bg'     => '#2d2d2d',
			),
			'limit'              => array(
				'label'  => 'Limit',
				'icon'   => 'symbol',
				'symbol' => '⊐',
				'color'  => '#95A5A6',
				'bg'     => '#2d2d2d',
			),
			'removeDuplicates'   => array(
				'label'  => 'Remove Duplicates',
				'icon'   => 'symbol',
				'symbol' => '≠',
				'color'  => '#95A5A6',
				'bg'     => '#2d2d2d',
			),
			'itemLists'          => array(
				'label'  => 'Item Lists',
				'icon'   => 'symbol',
				'symbol' => '≡',
				'color'  => '#95A5A6',
				'bg'     => '#2d2d2d',
			),
			'compareDatasets'    => array(
				'label'  => 'Compare Datasets',
				'icon'   => 'symbol',
				'symbol' => '△',
				'color'  => '#26C6DA',
				'bg'     => '#003040',
			),
			'noOp'               => array(
				'label'  => 'No Operation',
				'icon'   => 'symbol',
				'symbol' => '∅',
				'color'  => '#BDC3C7',
				'bg'     => '#2d2d2d',
			),
			'stickyNote'         => array(
				'label'  => 'Sticky Note',
				'icon'   => 'symbol',
				'symbol' => '📌',
				'color'  => '#F1C40F',
				'bg'     => '#3a3000',
			),
			'stopAndError'       => array(
				'label'  => 'Stop and Error',
				'icon'   => 'symbol',
				'symbol' => '✕',
				'color'  => '#E74C3C',
				'bg'     => '#3a1010',
			),

			// Data transformation.
			'toFile'             => array(
				'label'  => 'To File',
				'icon'   => 'symbol',
				'symbol' => '↓',
				'color'  => '#95A5A6',
				'bg'     => '#2d2d2d',
			),
			'convertToFile'      => array(
				'label'  => 'Convert to File',
				'icon'   => 'symbol',
				'symbol' => '↓',
				'color'  => '#95A5A6',
				'bg'     => '#2d2d2d',
			),
			'html'               => array(
				'label'  => 'HTML',
				'icon'   => 'symbol',
				'symbol' => '</>',
				'color'  => '#E34F26',
				'bg'     => '#3a1000',
			),
			'xml'                => array(
				'label'  => 'XML',
				'icon'   => 'symbol',
				'symbol' => '</>',
				'color'  => '#95A5A6',
				'bg'     => '#2d2d2d',
			),
			'markdown'           => array(
				'label'  => 'Markdown',
				'icon'   => 'symbol',
				'symbol' => 'M↓',
				'color'  => '#083FA1',
				'bg'     => '#001040',
			),
			'crypto'             => array(
				'label'  => 'Crypto',
				'icon'   => 'symbol',
				'symbol' => '🔒',
				'color'  => '#F39C12',
				'bg'     => '#3a2800',
			),
			'compression'        => array(
				'label'  => 'Compression',
				'icon'   => 'symbol',
				'symbol' => '⇩',
				'color'  => '#95A5A6',
				'bg'     => '#2d2d2d',
			),
			'extractFromFile'    => array(
				'label'  => 'Extract from File',
				'icon'   => 'symbol',
				'symbol' => '↑',
				'color'  => '#95A5A6',
				'bg'     => '#2d2d2d',
			),

			// Databases.
			'mySql'              => array(
				'label'  => 'MySQL',
				'icon'   => 'initials',
				'symbol' => 'My',
				'color'  => '#4479A1',
				'bg'     => '#001530',
			),
			'postgres'           => array(
				'label'  => 'PostgreSQL',
				'icon'   => 'initials',
				'symbol' => 'PG',
				'color'  => '#336791',
				'bg'     => '#001030',
			),
			'redis'              => array(
				'label'  => 'Redis',
				'icon'   => 'initials',
				'symbol' => 'Re',
				'color'  => '#DC382D',
				'bg'     => '#3a1010',
			),
			'mongodb'            => array(
				'label'  => 'MongoDB',
				'icon'   => 'initials',
				'symbol' => 'Mg',
				'color'  => '#4DB33D',
				'bg'     => '#103010',
			),
			'sqlite'             => array(
				'label'  => 'SQLite',
				'icon'   => 'initials',
				'symbol' => 'SL',
				'color'  => '#003B57',
				'bg'     => '#001020',
			),
			'microsoftSql'       => array(
				'label'  => 'MS SQL',
				'icon'   => 'initials',
				'symbol' => 'MS',
				'color'  => '#CC2927',
				'bg'     => '#3a1010',
			),
			'supabase'           => array(
				'label'  => 'Supabase',
				'icon'   => 'initials',
				'symbol' => 'Sb',
				'color'  => '#3ECF8E',
				'bg'     => '#103020',
			),

			// Communication.
			'slack'              => array(
				'label'  => 'Slack',
				'icon'   => 'initials',
				'symbol' => 'Sl',
				'color'  => '#4A154B',
				'bg'     => '#200020',
			),
			'telegram'           => array(
				'label'  => 'Telegram',
				'icon'   => 'symbol',
				'symbol' => '✈',
				'color'  => '#2CA5E0',
				'bg'     => '#003040',
			),
			'discord'            => array(
				'label'  => 'Discord',
				'icon'   => 'initials',
				'symbol' => 'Dc',
				'color'  => '#5865F2',
				'bg'     => '#101080',
			),
			'mattermost'         => array(
				'label'  => 'Mattermost',
				'icon'   => 'initials',
				'symbol' => 'Mm',
				'color'  => '#0058CC',
				'bg'     => '#001840',
			),
			'emailSend'          => array(
				'label'  => 'Send Email',
				'icon'   => 'symbol',
				'symbol' => '✉',
				'color'  => '#E74C3C',
				'bg'     => '#3a1010',
			),
			'sendEmail'          => array(
				'label'  => 'Send Email',
				'icon'   => 'symbol',
				'symbol' => '✉',
				'color'  => '#E74C3C',
				'bg'     => '#3a1010',
			),
			'gmail'              => array(
				'label'  => 'Gmail',
				'icon'   => 'initials',
				'symbol' => 'Gm',
				'color'  => '#EA4335',
				'bg'     => '#3a1010',
			),
			'microsoftOutlook'   => array(
				'label'  => 'Outlook',
				'icon'   => 'initials',
				'symbol' => 'Ol',
				'color'  => '#0078D4',
				'bg'     => '#001840',
			),
			'whatsapp'           => array(
				'label'  => 'WhatsApp',
				'icon'   => 'initials',
				'symbol' => 'WA',
				'color'  => '#25D366',
				'bg'     => '#103020',
			),
			'twilio'             => array(
				'label'  => 'Twilio',
				'icon'   => 'initials',
				'symbol' => 'Tw',
				'color'  => '#F22F46',
				'bg'     => '#3a1010',
			),

			// Google.
			'googleSheets'       => array(
				'label'  => 'Google Sheets',
				'icon'   => 'initials',
				'symbol' => 'GS',
				'color'  => '#34A853',
				'bg'     => '#103020',
			),
			'googleDrive'        => array(
				'label'  => 'Google Drive',
				'icon'   => 'initials',
				'symbol' => 'GD',
				'color'  => '#4285F4',
				'bg'     => '#001840',
			),
			'googleCalendar'     => array(
				'label'  => 'Google Calendar',
				'icon'   => 'initials',
				'symbol' => 'GC',
				'color'  => '#4285F4',
				'bg'     => '#001840',
			),
			'googleDocs'         => array(
				'label'  => 'Google Docs',
				'icon'   => 'initials',
				'symbol' => 'Gd',
				'color'  => '#4285F4',
				'bg'     => '#001840',
			),
			'youTube'            => array(
				'label'  => 'YouTube',
				'icon'   => 'initials',
				'symbol' => 'YT',
				'color'  => '#FF0000',
				'bg'     => '#3a0000',
			),

			// Dev / Version control.
			'github'             => array(
				'label'  => 'GitHub',
				'icon'   => 'initials',
				'symbol' => 'GH',
				'color'  => '#24292E',
				'bg'     => '#000000',
			),
			'gitlab'             => array(
				'label'  => 'GitLab',
				'icon'   => 'initials',
				'symbol' => 'GL',
				'color'  => '#FC6D26',
				'bg'     => '#3a1a00',
			),
			'jira'               => array(
				'label'  => 'Jira',
				'icon'   => 'initials',
				'symbol' => 'Ji',
				'color'  => '#0052CC',
				'bg'     => '#001840',
			),
			'confluence'         => array(
				'label'  => 'Confluence',
				'icon'   => 'initials',
				'symbol' => 'Cf',
				'color'  => '#0052CC',
				'bg'     => '#001840',
			),
			'linear'             => array(
				'label'  => 'Linear',
				'icon'   => 'initials',
				'symbol' => 'Li',
				'color'  => '#5E6AD2',
				'bg'     => '#101040',
			),
			'notion'             => array(
				'label'  => 'Notion',
				'icon'   => 'initials',
				'symbol' => 'No',
				'color'  => '#FFFFFF',
				'bg'     => '#1a1a1a',
			),

			// AI.
			'openAi'             => array(
				'label'  => 'OpenAI',
				'icon'   => 'initials',
				'symbol' => 'OA',
				'color'  => '#00A67E',
				'bg'     => '#003020',
			),
			'anthropicClaude'    => array(
				'label'  => 'Anthropic',
				'icon'   => 'initials',
				'symbol' => 'An',
				'color'  => '#D97757',
				'bg'     => '#3a1a00',
			),
			'anthropic'          => array(
				'label'  => 'Anthropic',
				'icon'   => 'initials',
				'symbol' => 'An',
				'color'  => '#D97757',
				'bg'     => '#3a1a00',
			),
			'gemini'             => array(
				'label'  => 'Gemini',
				'icon'   => 'initials',
				'symbol' => 'Gm',
				'color'  => '#4285F4',
				'bg'     => '#001840',
			),
			'googleAi'           => array(
				'label'  => 'Google AI',
				'icon'   => 'initials',
				'symbol' => 'GA',
				'color'  => '#4285F4',
				'bg'     => '#001840',
			),
			'huggingFace'        => array(
				'label'  => 'HuggingFace',
				'icon'   => 'initials',
				'symbol' => 'HF',
				'color'  => '#FFD21E',
				'bg'     => '#3a2a00',
			),
			'mistral'            => array(
				'label'  => 'Mistral',
				'icon'   => 'initials',
				'symbol' => 'Mi',
				'color'  => '#FF7000',
				'bg'     => '#3a1a00',
			),
			'ollama'             => array(
				'label'  => 'Ollama',
				'icon'   => 'initials',
				'symbol' => 'Ol',
				'color'  => '#7C3AED',
				'bg'     => '#200040',
			),
			'lmChatOllama'       => array(
				'label'  => 'Ollama Chat',
				'icon'   => 'initials',
				'symbol' => 'Ol',
				'color'  => '#7C3AED',
				'bg'     => '#200040',
			),
			'cohere'             => array(
				'label'  => 'Cohere',
				'icon'   => 'initials',
				'symbol' => 'Co',
				'color'  => '#39594D',
				'bg'     => '#102020',
			),
			'lmChatOpenAi'       => array(
				'label'  => 'OpenAI Chat',
				'icon'   => 'initials',
				'symbol' => 'OA',
				'color'  => '#00A67E',
				'bg'     => '#003020',
			),
			'lmChatAnthropic'    => array(
				'label'  => 'Anthropic Chat',
				'icon'   => 'initials',
				'symbol' => 'An',
				'color'  => '#D97757',
				'bg'     => '#3a1a00',
			),
			'agent'              => array(
				'label'  => 'AI Agent',
				'icon'   => 'symbol',
				'symbol' => '🤖',
				'color'  => '#7C3AED',
				'bg'     => '#200040',
			),
			'chainLlm'           => array(
				'label'  => 'LLM Chain',
				'icon'   => 'symbol',
				'symbol' => '⛓',
				'color'  => '#7C3AED',
				'bg'     => '#200040',
			),
			'vectorStore'        => array(
				'label'  => 'Vector Store',
				'icon'   => 'symbol',
				'symbol' => '⊞',
				'color'  => '#7C3AED',
				'bg'     => '#200040',
			),
			'memoryBufferWindow' => array(
				'label'  => 'Memory Buffer',
				'icon'   => 'symbol',
				'symbol' => '◫',
				'color'  => '#7C3AED',
				'bg'     => '#200040',
			),

			// Storage / Files.
			'ftp'                => array(
				'label'  => 'FTP',
				'icon'   => 'initials',
				'symbol' => 'FT',
				'color'  => '#F39C12',
				'bg'     => '#3a2800',
			),
			'ssh'                => array(
				'label'  => 'SSH',
				'icon'   => 'symbol',
				'symbol' => '$_',
				'color'  => '#2ECC71',
				'bg'     => '#103020',
			),
			'readWriteFile'      => array(
				'label'  => 'Read/Write Files',
				'icon'   => 'symbol',
				'symbol' => '📁',
				'color'  => '#F39C12',
				'bg'     => '#3a2800',
			),
			'airtable'           => array(
				'label'  => 'Airtable',
				'icon'   => 'initials',
				'symbol' => 'At',
				'color'  => '#18BFFF',
				'bg'     => '#003040',
			),
			'baserow'            => array(
				'label'  => 'Baserow',
				'icon'   => 'initials',
				'symbol' => 'Br',
				'color'  => '#4A90D9',
				'bg'     => '#001840',
			),

			// CRM / Marketing.
			'hubspot'            => array(
				'label'  => 'HubSpot',
				'icon'   => 'initials',
				'symbol' => 'Hs',
				'color'  => '#FF7A59',
				'bg'     => '#3a1a00',
			),
			'salesforce'         => array(
				'label'  => 'Salesforce',
				'icon'   => 'initials',
				'symbol' => 'Sf',
				'color'  => '#00A1E0',
				'bg'     => '#003040',
			),
			'mailchimp'          => array(
				'label'  => 'Mailchimp',
				'icon'   => 'initials',
				'symbol' => 'Mc',
				'color'  => '#FFE01B',
				'bg'     => '#3a3000',
			),
			'brevo'              => array(
				'label'  => 'Brevo',
				'icon'   => 'initials',
				'symbol' => 'Bv',
				'color'  => '#0092FF',
				'bg'     => '#003040',
			),

			// WordPress / CMS.
			'wordpress'          => array(
				'label'  => 'WordPress',
				'icon'   => 'initials',
				'symbol' => 'WP',
				'color'  => '#21759B',
				'bg'     => '#002030',
			),
			'rssFeedRead'        => array(
				'label'  => 'RSS Feed',
				'icon'   => 'symbol',
				'symbol' => '◉',
				'color'  => '#F26522',
				'bg'     => '#3a1000',
			),
		);
	}

	/**
	 * Looks up a node by its full n8n type string.
	 * Extracts the slug (last segment after dot) for registry lookup.
	 *
	 * @param string $type Full n8n type string e.g. "n8n-nodes-base.httpRequest".
	 * @return array Node type data or fallback entry.
	 */
	public static function lookup( string $type ): array {
		$registry = self::get_registry();
		$slug     = self::extract_slug( $type );

		// Case-sensitive exact match first.
		if ( isset( $registry[ $slug ] ) ) {
			return $registry[ $slug ];
		}

		// Case-insensitive fallback.
		$slug_lower = strtolower( $slug );
		foreach ( $registry as $key => $entry ) {
			if ( strtolower( $key ) === $slug_lower ) {
				return $entry;
			}
		}

		// Generate fallback entry.
		return self::generate_fallback( $type, $slug );
	}

	/**
	 * Extracts the node slug from a full n8n type string.
	 *
	 * @param string $type e.g. "n8n-nodes-base.httpRequest" → "httpRequest".
	 */
	public static function extract_slug( string $type ): string {
		$parts = explode( '.', $type );
		return end( $parts );
	}

	/**
	 * Generates a deterministic fallback entry for unknown node types.
	 * Uses djb2 hash for a consistent color.
	 *
	 * @since 1.0.0
	 * @param string $type Full n8n node type string.
	 * @param string $slug Extracted slug portion.
	 * @return array Fallback display metadata.
	 */
	private static function generate_fallback( string $type, string $slug ): array {
		$hue = self::djb2_color_hue( $type );
		$hex = self::hsl_to_hex( $hue, 60, 55 );
		$bg  = self::hsl_to_hex( $hue, 40, 15 );

		// Derive 2-letter initials from slug.
		$initials = self::derive_initials( $slug );

		return array(
			'label'  => $slug,
			'icon'   => 'initials',
			'symbol' => $initials,
			'color'  => $hex,
			'bg'     => $bg,
		);
	}

	/**
	 * Derives 2-letter initials from a camelCase or PascalCase slug.
	 *
	 * @since 1.0.0
	 * @param string $slug Node type slug.
	 * @return string Two uppercase initials.
	 */
	private static function derive_initials( string $slug ): string {
		// Split on camelCase boundaries.
		$parts = preg_split( '/(?=[A-Z])/', $slug, -1, PREG_SPLIT_NO_EMPTY );
		if ( ! $parts ) {
			return strtoupper( substr( $slug, 0, 2 ) );
		}

		if ( count( $parts ) >= 2 ) {
			return strtoupper( substr( $parts[0], 0, 1 ) . substr( $parts[1], 0, 1 ) );
		}
		return strtoupper( substr( $slug, 0, 2 ) );
	}

	/**
	 * Computes a djb2 hash and maps it to a color hue in the 0-359 range.
	 *
	 * @since 1.0.0
	 * @param string $str Input string to hash.
	 * @return int Hue value between 0 and 359.
	 */
	private static function djb2_color_hue( string $str ): int {
		$hash = 5381;
		$len  = strlen( $str );
		for ( $i = 0; $i < $len; $i++ ) {
			$hash  = ( ( $hash << 5 ) + $hash ) + ord( $str[ $i ] );
			$hash &= 0xFFFFFFFF;
		}
		return abs( $hash ) % 360;
	}

	/**
	 * Converts HSL to 6-digit hex color string.
	 *
	 * @since 1.0.0
	 * @param int $h Hue (0-359).
	 * @param int $s Saturation (0-100).
	 * @param int $l Lightness (0-100).
	 * @return string Hex color string (e.g. "#ff8800").
	 */
	private static function hsl_to_hex( int $h, int $s, int $l ): string {
		$s /= 100;
		$l /= 100;
		$a  = $s * min( $l, 1 - $l );
		$f  = static function ( $n ) use ( $h, $l, $a ) {
			$k = fmod( $n + $h / 30, 12 );
			return $l - $a * max( min( $k - 3, 9 - $k, 1 ), -1 );
		};
		$r  = (int) round( $f( 0 ) * 255 );
		$g  = (int) round( $f( 8 ) * 255 );
		$b  = (int) round( $f( 4 ) * 255 );
		return sprintf( '#%02x%02x%02x', max( 0, min( 255, $r ) ), max( 0, min( 255, $g ) ), max( 0, min( 255, $b ) ) );
	}
}