<?php

namespace TablePress\PhpOffice\PhpSpreadsheet\Calculation;

class CalculationLocale extends CalculationBase
{
	public const FORMULA_OPEN_FUNCTION_BRACE = '(';
	public const FORMULA_CLOSE_FUNCTION_BRACE = ')';
	public const FORMULA_OPEN_MATRIX_BRACE = '{';
	public const FORMULA_CLOSE_MATRIX_BRACE = '}';
	public const FORMULA_STRING_QUOTE = '"';

	//    Strip xlfn and xlws prefixes from function name
	public const CALCULATION_REGEXP_STRIP_XLFN_XLWS = '/(_xlfn[.])?(_xlws[.])?(?=[\p{L}][\p{L}\p{N}\.]*[\s]*[(])/';

	/**
	 * The current locale setting.
	 */
	protected static string $localeLanguage = 'en_us'; //    US English    (default locale)

	/**
	 * List of available locale settings
	 * Note that this is read for the locale subdirectory only when requested.
	 *
	 * @var string[]
	 */
	protected static array $validLocaleLanguages = [
		'en', //    English        (default language)
	];

	/**
	 * Locale-specific argument separator for function arguments.
	 */
	protected static string $localeArgumentSeparator = ',';

	/** @var string[] */
	protected static array $localeFunctions = [];

	/**
	 * Locale-specific translations for Excel constants (True, False and Null).
	 *
	 * @var array<string, string>
	 */
	protected static array $localeBoolean = [
		'TRUE' => 'TRUE',
		'FALSE' => 'FALSE',
		'NULL' => 'NULL',
	];

	/** @var array<int, array<int, string>> */
	protected static array $falseTrueArray = [];

	public static function getLocaleBoolean(string $index): string
	{
		return self::$localeBoolean[$index];
	}

	protected static function loadLocales(): void
	{
		$localeFileDirectory = __DIR__ . '/locale/';
		$localeFileNames = glob($localeFileDirectory . '*', GLOB_ONLYDIR) ?: [];
		foreach ($localeFileNames as $filename) {
			$filename = (string) substr($filename, strlen($localeFileDirectory));
			if ($filename != 'en') {
				self::$validLocaleLanguages[] = $filename;
				$subdirs = glob("$localeFileDirectory$filename/*", GLOB_ONLYDIR) ?: [];
				foreach ($subdirs as $subdir) {
					$subdirx = basename($subdir);
					self::$validLocaleLanguages[] = "{$filename}_{$subdirx}";
				}
			}
		}
	}

	/**
	 * Return the locale-specific translation of TRUE.
	 *
	 * @return string locale-specific translation of TRUE
	 */
	public static function getTRUE(): string
	{
		return self::$localeBoolean['TRUE'];
	}

	/**
	 * Return the locale-specific translation of FALSE.
	 *
	 * @return string locale-specific translation of FALSE
	 */
	public static function getFALSE(): string
	{
		return self::$localeBoolean['FALSE'];
	}

	/**
	 * Get the currently defined locale code.
	 */
	public function getLocale(): string
	{
		return self::$localeLanguage;
	}

	protected function getLocaleFile(string $localeDir, string $locale, string $language, string $file): string
	{
		$localeFileName = $localeDir . str_replace('_', DIRECTORY_SEPARATOR, $locale)
			. DIRECTORY_SEPARATOR . $file;
		if (!file_exists($localeFileName)) {
			//    If there isn't a locale specific file, look for a language specific file
			$localeFileName = $localeDir . $language . DIRECTORY_SEPARATOR . $file;
			if (!file_exists($localeFileName)) {
				throw new Exception('Locale file not found');
			}
		}

		return $localeFileName;
	}

	/** @return array<int, array<int, string>> */
	public function getFalseTrueArray(): array
	{
		if (!empty(self::$falseTrueArray)) {
			return self::$falseTrueArray;
		}
		if (count(self::$validLocaleLanguages) == 1) {
			self::loadLocales();
		}
		$falseTrueArray = [['FALSE'], ['TRUE']];
		foreach (self::$validLocaleLanguages as $language) {
			if (str_starts_with($language, 'en')) {
				continue;
			}
			$locale = $language;
			if (str_contains($locale, '_')) {
				[$language] = explode('_', $locale);
			}
			$localeDir = implode(DIRECTORY_SEPARATOR, [__DIR__, 'locale', null]);

			try {
				$functionNamesFile = $this->getLocaleFile($localeDir, $locale, $language, 'functions');
			} catch (Exception $e) {
				continue;
			}
			//    Retrieve the list of locale or language specific function names
			$localeFunctions = file($functionNamesFile, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES) ?: [];
			foreach ($localeFunctions as $localeFunction) {
				[$localeFunction] = explode('##', $localeFunction); //    Strip out comments
				if (str_contains($localeFunction, '=')) {
					[$fName, $lfName] = array_map('trim', explode('=', $localeFunction));
					if ($fName === 'FALSE') {
						$falseTrueArray[0][] = $lfName;
					} elseif ($fName === 'TRUE') {
						$falseTrueArray[1][] = $lfName;
					}
				}
			}
		}
		self::$falseTrueArray = $falseTrueArray;

		return $falseTrueArray;
	}

	/**
	 * Set the locale code.
	 *
	 * @param string $locale The locale to use for formula translation, eg: 'en_us'
	 */
	public function setLocale(string $locale): bool
	{
		//    Identify our locale and language
		$language = $locale = strtolower($locale);
		if (str_contains($locale, '_')) {
			[$language] = explode('_', $locale);
		}
		if (count(self::$validLocaleLanguages) == 1) {
			self::loadLocales();
		}

		//    Test whether we have any language data for this language (any locale)
		if (in_array($language, self::$validLocaleLanguages, true)) {
			//    initialise language/locale settings
			self::$localeFunctions = [];
			self::$localeArgumentSeparator = ',';
			self::$localeBoolean = ['TRUE' => 'TRUE', 'FALSE' => 'FALSE', 'NULL' => 'NULL'];

			//    Default is US English, if user isn't requesting US english, then read the necessary data from the locale files
			if ($locale !== 'en_us') {
				$localeDir = implode(DIRECTORY_SEPARATOR, [__DIR__, 'locale', null]);

				//    Search for a file with a list of function names for locale
				try {
					$functionNamesFile = $this->getLocaleFile($localeDir, $locale, $language, 'functions');
				} catch (Exception $e) {
					return false;
				}

				//    Retrieve the list of locale or language specific function names
				$localeFunctions = file($functionNamesFile, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES) ?: [];
				$phpSpreadsheetFunctions = &self::getFunctionsAddress();
				foreach ($localeFunctions as $localeFunction) {
					[$localeFunction] = explode('##', $localeFunction); //    Strip out comments
					if (str_contains($localeFunction, '=')) {
						[$fName, $lfName] = array_map('trim', explode('=', $localeFunction));
						if ((str_starts_with($fName, '*') || isset($phpSpreadsheetFunctions[$fName])) && ($lfName != '') && ($fName != $lfName)) {
							self::$localeFunctions[$fName] = $lfName;
						}
					}
				}
				//    Default the TRUE and FALSE constants to the locale names of the TRUE() and FALSE() functions
				if (isset(self::$localeFunctions['TRUE'])) {
					self::$localeBoolean['TRUE'] = self::$localeFunctions['TRUE'];
				}
				if (isset(self::$localeFunctions['FALSE'])) {
					self::$localeBoolean['FALSE'] = self::$localeFunctions['FALSE'];
				}

				try {
					$configFile = $this->getLocaleFile($localeDir, $locale, $language, 'config');
				} catch (Exception $exception) {
					return false;
				}

				$localeSettings = file($configFile, FILE_IGNORE_NEW_LINES | FILE_SKIP_EMPTY_LINES) ?: [];
				foreach ($localeSettings as $localeSetting) {
					[$localeSetting] = explode('##', $localeSetting); //    Strip out comments
					if (str_contains($localeSetting, '=')) {
						[$settingName, $settingValue] = array_map('trim', explode('=', $localeSetting));
						$settingName = strtoupper($settingName);
						if ($settingValue !== '') {
							switch ($settingName) {
								case 'ARGUMENTSEPARATOR':
									self::$localeArgumentSeparator = $settingValue;

									break;
							}
						}
					}
				}
			}

			self::$functionReplaceFromExcel = self::$functionReplaceToExcel
			= self::$functionReplaceFromLocale = self::$functionReplaceToLocale = null;
			self::$localeLanguage = $locale;

			return true;
		}

		return false;
	}

	public static function translateSeparator(
		string $fromSeparator,
		string $toSeparator,
		string $formula,
		int &$inBracesLevel,
		string $openBrace = self::FORMULA_OPEN_FUNCTION_BRACE,
		string $closeBrace = self::FORMULA_CLOSE_FUNCTION_BRACE
	): string {
		$strlen = mb_strlen($formula);
		for ($i = 0; $i < $strlen; ++$i) {
			$chr = mb_substr($formula, $i, 1);
			switch ($chr) {
				case $openBrace:
					++$inBracesLevel;

					break;
				case $closeBrace:
					--$inBracesLevel;

					break;
				case $fromSeparator:
					if ($inBracesLevel > 0) {
						$formula = mb_substr($formula, 0, $i) . $toSeparator . mb_substr($formula, $i + 1);
					}
			}
		}

		return $formula;
	}

	/**
	 * @param string[] $from
	 * @param string[] $to
	 */
	protected static function translateFormulaBlock(
		array $from,
		array $to,
		string $formula,
		int &$inFunctionBracesLevel,
		int &$inMatrixBracesLevel,
		string $fromSeparator,
		string $toSeparator
	): string {
		// Function Names
		$formula = (string) preg_replace($from, $to, $formula);

		// Temporarily adjust matrix separators so that they won't be confused with function arguments
		$formula = self::translateSeparator(';', '|', $formula, $inMatrixBracesLevel, self::FORMULA_OPEN_MATRIX_BRACE, self::FORMULA_CLOSE_MATRIX_BRACE);
		$formula = self::translateSeparator(',', '!', $formula, $inMatrixBracesLevel, self::FORMULA_OPEN_MATRIX_BRACE, self::FORMULA_CLOSE_MATRIX_BRACE);
		// Function Argument Separators
		$formula = self::translateSeparator($fromSeparator, $toSeparator, $formula, $inFunctionBracesLevel);
		// Restore matrix separators
		$formula = self::translateSeparator('|', ';', $formula, $inMatrixBracesLevel, self::FORMULA_OPEN_MATRIX_BRACE, self::FORMULA_CLOSE_MATRIX_BRACE);
		$formula = self::translateSeparator('!', ',', $formula, $inMatrixBracesLevel, self::FORMULA_OPEN_MATRIX_BRACE, self::FORMULA_CLOSE_MATRIX_BRACE);

		return $formula;
	}

	/**
	 * @param string[] $from
	 * @param string[] $to
	 */
	protected static function translateFormula(array $from, array $to, string $formula, string $fromSeparator, string $toSeparator): string
	{
		// Convert any Excel function names and constant names to the required language;
		//     and adjust function argument separators
		if (self::$localeLanguage !== 'en_us') {
			$inFunctionBracesLevel = 0;
			$inMatrixBracesLevel = 0;
			//    If there is the possibility of separators within a quoted string, then we treat them as literals
			if (str_contains($formula, self::FORMULA_STRING_QUOTE)) {
				//    So instead we skip replacing in any quoted strings by only replacing in every other array element
				//       after we've exploded the formula
				$temp = explode(self::FORMULA_STRING_QUOTE, $formula);
				$notWithinQuotes = false;
				foreach ($temp as &$value) {
					//    Only adjust in alternating array entries
					$notWithinQuotes = $notWithinQuotes === false;
					if ($notWithinQuotes === true) {
						$value = self::translateFormulaBlock($from, $to, $value, $inFunctionBracesLevel, $inMatrixBracesLevel, $fromSeparator, $toSeparator);
					}
				}
				unset($value);
				//    Then rebuild the formula string
				$formula = implode(self::FORMULA_STRING_QUOTE, $temp);
			} else {
				//    If there's no quoted strings, then we do a simple count/replace
				$formula = self::translateFormulaBlock($from, $to, $formula, $inFunctionBracesLevel, $inMatrixBracesLevel, $fromSeparator, $toSeparator);
			}
		}

		return $formula;
	}

	/** @var null|string[] */
	private static ?array $functionReplaceFromExcel;

	/** @var null|string[] */
	private static ?array $functionReplaceToLocale;

	public function translateFormulaToLocale(string $formula): string
	{
		$formula = preg_replace(self::CALCULATION_REGEXP_STRIP_XLFN_XLWS, '', $formula) ?? '';
		// Build list of function names and constants for translation
		if (self::$functionReplaceFromExcel === null) {
			self::$functionReplaceFromExcel = [];
			foreach (array_keys(self::$localeFunctions) as $excelFunctionName) {
				self::$functionReplaceFromExcel[] = '/(@?[^\w\.])' . preg_quote($excelFunctionName, '/') . '([\s]*\()/ui';
			}
			foreach (array_keys(self::$localeBoolean) as $excelBoolean) {
				self::$functionReplaceFromExcel[] = '/(@?[^\w\.])' . preg_quote($excelBoolean, '/') . '([^\w\.])/ui';
			}
		}

		if (self::$functionReplaceToLocale === null) {
			self::$functionReplaceToLocale = [];
			foreach (self::$localeFunctions as $localeFunctionName) {
				self::$functionReplaceToLocale[] = '$1' . trim($localeFunctionName) . '$2';
			}
			foreach (self::$localeBoolean as $localeBoolean) {
				self::$functionReplaceToLocale[] = '$1' . trim($localeBoolean) . '$2';
			}
		}

		return self::translateFormula(
			self::$functionReplaceFromExcel,
			self::$functionReplaceToLocale,
			$formula,
			',',
			self::$localeArgumentSeparator
		);
	}

	/** @var null|string[] */
	protected static ?array $functionReplaceFromLocale;

	/** @var null|string[] */
	protected static ?array $functionReplaceToExcel;

	public function translateFormulaToEnglish(string $formula): string
	{
		if (self::$functionReplaceFromLocale === null) {
			self::$functionReplaceFromLocale = [];
			foreach (self::$localeFunctions as $localeFunctionName) {
				self::$functionReplaceFromLocale[] = '/(@?[^\w\.])' . preg_quote($localeFunctionName, '/') . '([\s]*\()/ui';
			}
			foreach (self::$localeBoolean as $excelBoolean) {
				self::$functionReplaceFromLocale[] = '/(@?[^\w\.])' . preg_quote($excelBoolean, '/') . '([^\w\.])/ui';
			}
		}

		if (self::$functionReplaceToExcel === null) {
			self::$functionReplaceToExcel = [];
			foreach (array_keys(self::$localeFunctions) as $excelFunctionName) {
				self::$functionReplaceToExcel[] = '$1' . trim($excelFunctionName) . '$2';
			}
			foreach (array_keys(self::$localeBoolean) as $excelBoolean) {
				self::$functionReplaceToExcel[] = '$1' . trim($excelBoolean) . '$2';
			}
		}

		return self::translateFormula(self::$functionReplaceFromLocale, self::$functionReplaceToExcel, $formula, self::$localeArgumentSeparator, ',');
	}

	public static function localeFunc(string $function): string
	{
		if (self::$localeLanguage !== 'en_us') {
			$functionName = trim($function, '(');
			if (isset(self::$localeFunctions[$functionName])) {
				$brace = ($functionName != $function);
				$function = self::$localeFunctions[$functionName];
				if ($brace) {
					$function .= '(';
				}
			}
		}

		return $function;
	}
}