class ArrayHelper

class ArrayHelper {
    
    /**
     * @return list<ArrayKeyValue>
     */
    public static function parse(File $phpcsFile, int $arrayPointer) : array {
        $tokens = $phpcsFile->getTokens();
        $arrayToken = $tokens[$arrayPointer];
        [
            $arrayOpenerPointer,
            $arrayCloserPointer,
        ] = self::openClosePointers($arrayToken);
        $keyValues = [];
        $firstPointerOnNextLine = TokenHelper::findFirstTokenOnNextLine($phpcsFile, $arrayOpenerPointer + 1);
        $firstEffectivePointer = TokenHelper::findNextEffective($phpcsFile, $arrayOpenerPointer + 1);
        $arrayKeyValueStartPointer = $firstPointerOnNextLine !== null && $firstPointerOnNextLine < $firstEffectivePointer ? $firstPointerOnNextLine : $firstEffectivePointer;
        $arrayKeyValueEndPointer = $arrayKeyValueStartPointer;
        $indentation = $tokens[$arrayOpenerPointer]['line'] < $tokens[$firstEffectivePointer]['line'] ? IndentationHelper::getIndentation($phpcsFile, $firstEffectivePointer) : '';
        for ($i = $arrayKeyValueStartPointer; $i < $arrayCloserPointer; $i++) {
            $token = $tokens[$i];
            if (in_array($token['code'], TokenHelper::$arrayTokenCodes, true)) {
                $i = self::openClosePointers($token)[1];
                continue;
            }
            if (array_key_exists('scope_closer', $token) && $token['scope_closer'] > $i) {
                $i = $token['scope_closer'] - 1;
                continue;
            }
            if (array_key_exists('parenthesis_closer', $token) && $token['parenthesis_closer'] > $i) {
                $i = $token['parenthesis_closer'] - 1;
                continue;
            }
            $nextEffectivePointer = TokenHelper::findNextEffective($phpcsFile, $i + 1);
            if ($nextEffectivePointer === $arrayCloserPointer) {
                $arrayKeyValueEndPointer = self::getValueEndPointer($phpcsFile, $i, $arrayCloserPointer, $indentation);
                break;
            }
            if ($token['code'] !== T_COMMA || !ScopeHelper::isInSameScope($phpcsFile, $arrayOpenerPointer, $i)) {
                $arrayKeyValueEndPointer = $i;
                continue;
            }
            $arrayKeyValueEndPointer = self::getValueEndPointer($phpcsFile, $i, $arrayCloserPointer, $indentation);
            $keyValues[] = new ArrayKeyValue($phpcsFile, $arrayKeyValueStartPointer, $arrayKeyValueEndPointer);
            $arrayKeyValueStartPointer = $arrayKeyValueEndPointer + 1;
            $i = $arrayKeyValueEndPointer;
        }
        $keyValues[] = new ArrayKeyValue($phpcsFile, $arrayKeyValueStartPointer, $arrayKeyValueEndPointer);
        return $keyValues;
    }
    
    /**
     * @param list<ArrayKeyValue> $keyValues
     */
    public static function getIndentation(array $keyValues) : ?string {
        $indents = [];
        foreach ($keyValues as $keyValue) {
            $indent = $keyValue->getIndent() ?? 'null';
            $indents[$indent] = isset($indents[$indent]) ? $indents[$indent] + 1 : 1;
        }
        arsort($indents);
        $indent = key($indents);
        return $indent !== 'null' ? (string) $indent : null;
    }
    
    /**
     * @param list<ArrayKeyValue> $keyValues
     */
    public static function isKeyed(array $keyValues) : bool {
        foreach ($keyValues as $keyValue) {
            if ($keyValue->getKey() !== null) {
                return true;
            }
        }
        return false;
    }
    
    /**
     * @param list<ArrayKeyValue> $keyValues
     */
    public static function isKeyedAll(array $keyValues) : bool {
        foreach ($keyValues as $keyValue) {
            if (!$keyValue->isUnpacking() && $keyValue->getKey() === null) {
                return false;
            }
        }
        return true;
    }
    
    /**
     * Test if non-empty array with opening & closing brackets on separate lines
     */
    public static function isMultiLine(File $phpcsFile, int $pointer) : bool {
        $tokens = $phpcsFile->getTokens();
        $token = $tokens[$pointer];
        [
            $pointerOpener,
            $pointerCloser,
        ] = self::openClosePointers($token);
        $tokenOpener = $tokens[$pointerOpener];
        $tokenCloser = $tokens[$pointerCloser];
        return $tokenOpener['line'] !== $tokenCloser['line'];
    }
    
    /**
     * Test if effective tokens between open & closing tokens
     */
    public static function isNotEmpty(File $phpcsFile, int $pointer) : bool {
        $tokens = $phpcsFile->getTokens();
        $token = $tokens[$pointer];
        [
            $pointerOpener,
            $pointerCloser,
        ] = self::openClosePointers($token);
        
        /** @var int $pointerPreviousToClose */
        $pointerPreviousToClose = TokenHelper::findPreviousEffective($phpcsFile, $pointerCloser - 1);
        return $pointerPreviousToClose !== $pointerOpener;
    }
    
    /**
     * @param list<ArrayKeyValue> $keyValues
     */
    public static function isSortedByKey(array $keyValues) : bool {
        $previousKey = '';
        foreach ($keyValues as $keyValue) {
            if ($keyValue->isUnpacking()) {
                continue;
            }
            if (strnatcasecmp($previousKey, $keyValue->getKey()) === 1) {
                return false;
            }
            $previousKey = $keyValue->getKey();
        }
        return true;
    }
    
    /**
     * @param array<string, array<int, int|string>|int|string> $token
     * @return array{0: int, 1: int}
     */
    public static function openClosePointers(array $token) : array {
        $isShortArray = $token['code'] === T_OPEN_SHORT_ARRAY;
        $pointerOpener = $isShortArray ? $token['bracket_opener'] : $token['parenthesis_opener'];
        $pointerCloser = $isShortArray ? $token['bracket_closer'] : $token['parenthesis_closer'];
        return [
            (int) $pointerOpener,
            (int) $pointerCloser,
        ];
    }
    private static function getValueEndPointer(File $phpcsFile, int $endPointer, int $arrayCloserPointer, string $indentation) : int {
        $tokens = $phpcsFile->getTokens();
        $nextEffectivePointer = TokenHelper::findNextEffective($phpcsFile, $endPointer + 1, $arrayCloserPointer + 1);
        if ($tokens[$nextEffectivePointer]['line'] === $tokens[$endPointer]['line']) {
            return $nextEffectivePointer - 1;
        }
        for ($i = $endPointer + 1; $i < $nextEffectivePointer; $i++) {
            if ($tokens[$i]['line'] === $tokens[$endPointer]['line']) {
                $endPointer = $i;
                continue;
            }
            $nextNonWhitespacePointer = TokenHelper::findNextNonWhitespace($phpcsFile, $i);
            if (!in_array($tokens[$nextNonWhitespacePointer]['code'], TokenHelper::$inlineCommentTokenCodes, true)) {
                break;
            }
            if ($indentation === IndentationHelper::getIndentation($phpcsFile, $nextNonWhitespacePointer)) {
                $endPointer = $i - 1;
                break;
            }
            $i = TokenHelper::findLastTokenOnLine($phpcsFile, $i);
            $endPointer = $i;
        }
        return $endPointer;
    }

}