<?php

declare( strict_types = 1 );

function addToJson( string $code, array $messages ): void {
	$jsonFileName = __DIR__ . '/i18n/' . $code . '.json';
	$jsonText = @file_get_contents( $jsonFileName );
	if ( $jsonText === false ) {
		// empty stub file
		$jsonText = '{ "@metadata": { "authors": [] } }';
	}
	$json = json_decode( $jsonText, true );
	if ( $json === null ) {
		throw new RuntimeException( 'Unable to decode file: ' . $jsonFileName );
	}
	$json += $messages;
	ksort( $json );
	$jsonText = json_encode( $json, JSON_UNESCAPED_SLASHES | JSON_UNESCAPED_UNICODE | JSON_PRETTY_PRINT );
	if ( $jsonText === false ) {
		throw new RuntimeException( 'Unable to encode data for file: ' . $jsonFileName );
	}
	// fix indentation (regex taken from FormatJson::encode())
	$jsonText = preg_replace( '/ {4}|.*+\n\K {4}/A', "\t", $jsonText );
	$success = file_put_contents( $jsonFileName, $jsonText );
	if ( $success === false ) {
		throw new RuntimeException( 'Unable to write file: ' . $jsonFileName );
	}
}

/** Inverse {@link \MediaWiki\Languages\LanguageNameUtils::getFileName()}. */
function fileNamePartToCode( string $fileNamePart ): string {
	return str_replace( '_', '-', lcfirst( $fileNamePart ) );
}

function loadCldrNames(): array {
	$cldrLanguageNames = [];

	foreach ( scandir( __DIR__ . '/CldrNames' ) as $entry ) {
		$path = __DIR__ . '/CldrNames/' . $entry;
		if ( !is_file( $path ) ) {
			continue;
		}
		$languageNames = false;
		require $path;
		if ( is_array( $languageNames ) ) {
			$code = fileNamePartToCode( substr(
				$entry,
				9, // strlen( 'CldrNames' )
				-4 // strlen( '.php' )
			) );
			$cldrLanguageNames[$code] = $languageNames;
		}
	}

	return $cldrLanguageNames;
}

function loadLocalNames(): array {
	$localLanguageNames = [];

	foreach ( scandir( __DIR__ . '/LocalNames' ) as $entry ) {
		$path = __DIR__ . '/LocalNames/' . $entry;
		if ( !is_file( $path ) ) {
			continue;
		}
		$languageNames = false;
		require $path;
		if ( is_array( $languageNames ) ) {
			$code = fileNamePartToCode( substr(
				$entry,
				10, // strlen( 'LocalNames' )
				-4 // strlen( '.php' )
			) );
			$localLanguageNames[$code] = $languageNames;
		}
	}

	return $localLanguageNames;
}

$allCldrNames = loadCldrNames();
$allLocalNames = loadLocalNames();

$allMessages = [];
foreach ( $allCldrNames as $code => $cldrNames ) {
	foreach ( $cldrNames as $code2 => $cldrName ) {
		$allMessages[$code]["cldr-language-name-$code2"] = $cldrName;
	}
}
foreach ( $allLocalNames as $code => $localNames ) {
	foreach ( $localNames as $code2 => $localName ) {
		$allMessages[$code]["cldr-language-name-$code2"] = $localName;
	}
}

foreach ( $allCldrNames as $code => $cldrNames ) {
	foreach ( $cldrNames as $code2 => $cldrName ) {
		if ( !array_key_exists( $code2, $allCldrNames['en'] ) ) {
			fwrite(
				STDERR,
				"In CLDR, language code '$code2' has a name in '$code' but not in English!" . PHP_EOL
			);
		}
	}
}
foreach ( $allLocalNames as $code => $localNames ) {
	foreach ( $localNames as $code2 => $localName ) {
		if ( !array_key_exists( $code2, $allLocalNames['en'] ) ) {
			fwrite(
				STDERR,
				"In LocalNames, language code '$code2' has a name in '$code' but not in English!" . PHP_EOL
			);
		}
	}
}

foreach ( $allMessages as $code => $messages ) {
	foreach ( $messages as $key => $message ) {
		$code2 = substr( $key, 19 ); // strlen( 'cldr-language-name-' )
		$allMessages['qqq'][$key] =
			"Language name of the [https://hub.toolforge.org/P305:$code2 '$code2'] language code.";
		// TODO improve qqq

		if ( !array_key_exists( $key, $allMessages['en'] ) ) {
			fwrite(
				STDERR,
				"Overall, language code '$code2' has a name in '$code' but not in English!" . PHP_EOL
			);;
		}
	}
}

foreach ( $allMessages as $code => $messages ) {
	addToJson( $code, $messages );
}