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<?php
/**
 * \Drupal\Sniffs\Classes\FullyQualifiedNamespaceSniff.
 *
 * @category PHP
 * @package  PHP_CodeSniffer
 * @link     http://pear.php.net/package/PHP_CodeSniffer
 */

namespace Drupal\Sniffs\Classes;

use PHP_CodeSniffer\Files\File;
use PHP_CodeSniffer\Sniffs\Sniff;

/**
 * Checks that class references do not use FQN but use statements.
 *
 * @category PHP
 * @package  PHP_CodeSniffer
 * @link     http://pear.php.net/package/PHP_CodeSniffer
 */
class FullyQualifiedNamespaceSniff implements Sniff
{


    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array
     */
    public function register()
    {
        return array(T_NS_SEPARATOR);

    }//end register()


    /**
     * Processes this test, when one of its tokens is encountered.
     *
     * @param \PHP_CodeSniffer\Files\File $phpcsFile The PHP_CodeSniffer file where the
     *                                               token was found.
     * @param int                         $stackPtr  The position in the PHP_CodeSniffer
     *                                               file's token stack where the token
     *                                               was found.
     *
     * @return void|int Optionally returns a stack pointer. The sniff will not be
     *                  called again on the current file until the returned stack
     *                  pointer is reached. Return $phpcsFile->numTokens + 1 to skip
     *                  the rest of the file.
     */
    public function process(File $phpcsFile, $stackPtr)
    {
        $tokens = $phpcsFile->getTokens();

        // Skip this sniff in *api.php files because they want to have fully
        // qualified names for documentation purposes.
        if (substr($phpcsFile->getFilename(), -8) === '.api.php') {
            return ($phpcsFile->numTokens + 1);
        }

        // We are only interested in a backslash embedded between strings, which
        // means this is a class reference with more than once namespace part.
        if ($tokens[($stackPtr - 1)]['code'] !== T_STRING || $tokens[($stackPtr + 1)]['code'] !== T_STRING) {
            return;
        }

        // Check if this is a use statement and ignore those.
        $before = $phpcsFile->findPrevious([T_STRING, T_NS_SEPARATOR, T_WHITESPACE], $stackPtr, null, true);
        if ($tokens[$before]['code'] === T_USE || $tokens[$before]['code'] === T_NAMESPACE) {
            return $phpcsFile->findNext([T_STRING, T_NS_SEPARATOR], ($stackPtr + 1), null, true);
        }

        // If this is a namespaced function call then ignore this because use
        // statements for functions are not possible in PHP 5.5 and lower.
        $after = $phpcsFile->findNext([T_STRING, T_NS_SEPARATOR, T_WHITESPACE], $stackPtr, null, true);
        if ($tokens[$after]['code'] === T_OPEN_PARENTHESIS && $tokens[$before]['code'] !== T_NEW) {
            return ($after + 1);
        }

        $error = 'Namespaced classes/interfaces/traits should be referenced with use statements';
        $fix   = $phpcsFile->addFixableError($error, $stackPtr, 'UseStatementMissing');

        if ($fix === true) {
            $fullName = $phpcsFile->getTokensAsString(($before + 1), ($after - 1 - $before));
            $fullName = trim($fullName, '\ ');

            $phpcsFile->fixer->beginChangeset();

            // Replace the fully qualified name with the local name.
            for ($i = ($before + 1); $i < $after; $i++) {
                if ($tokens[$i]['code'] !== T_WHITESPACE) {
                    $phpcsFile->fixer->replaceToken($i, '');
                }
            }

            $parts     = explode('\\', $fullName);
            $className = end($parts);
            $phpcsFile->fixer->addContentBefore(($after - 1), $className);

            // Check if there is a use statement already for this class and
            // namespace.
            $alreadyUsed  = false;
            $useStatement = $phpcsFile->findNext(T_USE, 0);
            while ($useStatement !== false && empty($tokens[$useStatement]['conditions']) === true) {
                $useEnd   = $phpcsFile->findEndOfStatement($useStatement);
                $classRef = trim($phpcsFile->getTokensAsString(($useStatement + 1), ($useEnd - 1 - $useStatement)));
                if (strcasecmp($classRef, $fullName) === 0) {
                    $alreadyUsed = true;
                    break;
                }

                $useStatement = $phpcsFile->findNext(T_USE, ($useEnd + 1));
            }

            // @todo Check if the name is already in use - then we need to alias it.
            // Insert use statement at the beginning of the file if it is not there
            // already. Also check if another sniff (for example
            // UnusedUseStatementSniff) has already deleted the use statement, then
            // we need to add it back.
            if ($alreadyUsed === false
                || $phpcsFile->fixer->getTokenContent($useStatement) !== $tokens[$useStatement]['content']
            ) {
                // Check if there is a group of use statements and add it there.
                $useStatement = $phpcsFile->findNext(T_USE, 0);
                if ($useStatement !== false && empty($tokens[$useStatement]['conditions']) === true) {
                    $phpcsFile->fixer->addContentBefore($useStatement, "use $fullName;\n");
                } else {
                    // Check if there is an @file comment.
                    $beginning   = 0;
                    $fileComment = $phpcsFile->findNext(T_WHITESPACE, ($beginning + 1), null, true);
                    if ($tokens[$fileComment]['code'] === T_DOC_COMMENT_OPEN_TAG) {
                        $beginning = $tokens[$fileComment]['comment_closer'];
                    }

                    $phpcsFile->fixer->addContent($beginning, "use $fullName;\n");
                }
            }

            $phpcsFile->fixer->endChangeset();
        }//end if

        // Continue after this class reference so that errors for this are not
        // flagged multiple times.
        return $phpcsFile->findNext([T_STRING, T_NS_SEPARATOR], ($stackPtr + 1), null, true);

    }//end process()


}//end class