<?php

namespace MediaWiki\Extension\AbuseFilter\Variables;

use Html;
use MediaWiki\Extension\AbuseFilter\KeywordsManager;
use MessageLocalizer;
use Xml;

/**
 * Pretty-prints the content of a VariableHolder for use e.g. in AbuseLog hit details
 */
class VariablesFormatter {
	public const SERVICE_NAME = 'AbuseFilterVariablesFormatter';

	/** @var KeywordsManager */
	private $keywordsManager;
	/** @var VariablesManager */
	private $varManager;
	/** @var MessageLocalizer */
	private $messageLocalizer;

	/**
	 * @param KeywordsManager $keywordsManager
	 * @param VariablesManager $variablesManager
	 * @param MessageLocalizer $messageLocalizer
	 */
	public function __construct(
		KeywordsManager $keywordsManager,
		VariablesManager $variablesManager,
		MessageLocalizer $messageLocalizer
	) {
		$this->keywordsManager = $keywordsManager;
		$this->varManager = $variablesManager;
		$this->messageLocalizer = $messageLocalizer;
	}

	/**
	 * @param MessageLocalizer $messageLocalizer
	 */
	public function setMessageLocalizer( MessageLocalizer $messageLocalizer ): void {
		$this->messageLocalizer = $messageLocalizer;
	}

	/**
	 * @param VariableHolder $varHolder
	 * @return string
	 */
	public function buildVarDumpTable( VariableHolder $varHolder ): string {
		$vars = $this->varManager->exportAllVars( $varHolder );

		$output = '';

		$output .=
			Xml::openElement( 'table', [ 'class' => 'mw-abuselog-details' ] ) .
			Xml::openElement( 'tbody' ) .
			"\n";

		$header =
			Xml::element( 'th', null, $this->messageLocalizer->msg( 'abusefilter-log-details-var' )->text() ) .
			Xml::element( 'th', null, $this->messageLocalizer->msg( 'abusefilter-log-details-val' )->text() );
		$output .= Xml::tags( 'tr', null, $header ) . "\n";

		if ( !count( $vars ) ) {
			$output .= Xml::closeElement( 'tbody' ) . Xml::closeElement( 'table' );

			return $output;
		}

		// Now, build the body of the table.
		foreach ( $vars as $key => $value ) {
			$key = strtolower( $key );

			$varMsgKey = $this->keywordsManager->getMessageKeyForVar( $key );
			if ( $varMsgKey ) {
				$keyDisplay = $this->messageLocalizer->msg( $varMsgKey )->parse() . ' ' .
					Html::element(
						'code',
						[],
						// @phan-suppress-next-line SecurityCheck-XSS Keys are safe
						$this->messageLocalizer->msg( 'parentheses' )->rawParams( $key )->text()
					);
			} else {
				$keyDisplay = Html::element( 'code', [], $key );
			}

			$value = Html::element(
				'div',
				[ 'class' => 'mw-abuselog-var-value' ],
				self::formatVar( $value )
			);

			$trow =
				Xml::tags( 'td', [ 'class' => 'mw-abuselog-var' ], $keyDisplay ) .
				Xml::tags( 'td', [ 'class' => 'mw-abuselog-var-value' ], $value );
			$output .=
				Xml::tags( 'tr',
					[ 'class' => "mw-abuselog-details-$key mw-abuselog-value" ], $trow
				) . "\n";
		}

		$output .= Xml::closeElement( 'tbody' ) . Xml::closeElement( 'table' );

		return $output;
	}

	/**
	 * @param mixed $var
	 * @param string $indent
	 * @return string
	 */
	public static function formatVar( $var, string $indent = '' ): string {
		if ( $var === [] ) {
			return '[]';
		} elseif ( is_array( $var ) ) {
			$ret = '[';
			$indent .= "\t";
			foreach ( $var as $key => $val ) {
				$ret .= "\n$indent" . self::formatVar( $key, $indent ) .
					' => ' . self::formatVar( $val, $indent ) . ',';
			}
			// Strip trailing commas
			return substr( $ret, 0, -1 ) . "\n" . substr( $indent, 0, -1 ) . ']';
		} elseif ( is_string( $var ) ) {
			// Don't escape the string (specifically backslashes) to avoid displaying wrong stuff
			return "'$var'";
		} elseif ( $var === null ) {
			return 'null';
		} elseif ( is_float( $var ) ) {
			// Don't let float precision produce weirdness
			return (string)$var;
		}
		return var_export( $var, true );
	}
}