<?php
/**
 * Verifies that control statements conform to their coding standards.
 *
 * @author    Greg Sherwood <gsherwood@squiz.net>
 * @copyright 2006-2023 Squiz Pty Ltd (ABN 77 084 670 600)
 * @copyright 2023 PHPCSStandards and contributors
 * @license   https://github.com/PHPCSStandards/PHP_CodeSniffer/blob/HEAD/licence.txt BSD Licence
 */

namespace PHP_CodeSniffer\Standards\Squiz\Sniffs\ControlStructures;

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

class ControlSignatureSniff implements Sniff
{

    /**
     * How many spaces should precede the colon if using alternative syntax.
     *
     * @var integer
     */
    public $requiredSpacesBeforeColon = 1;


    /**
     * Returns an array of tokens this test wants to listen for.
     *
     * @return array<int|string>
     */
    public function register()
    {
        return [
            T_TRY,
            T_CATCH,
            T_FINALLY,
            T_DO,
            T_WHILE,
            T_FOR,
            T_IF,
            T_FOREACH,
            T_ELSE,
            T_ELSEIF,
            T_SWITCH,
            T_MATCH,
        ];
    }


    /**
     * Processes this test, when one of its tokens is encountered.
     *
     * @param \PHP_CodeSniffer\Files\File $phpcsFile The file being scanned.
     * @param int                         $stackPtr  The position of the current token in the
     *                                               stack passed in $tokens.
     *
     * @return void
     */
    public function process(File $phpcsFile, int $stackPtr)
    {
        $tokens = $phpcsFile->getTokens();

        $nextNonEmpty = $phpcsFile->findNext(Tokens::EMPTY_TOKENS, ($stackPtr + 1), null, true);
        if ($nextNonEmpty === false) {
            return;
        }

        $isAlternative = false;
        if (isset($tokens[$stackPtr]['scope_opener']) === true
            && $tokens[$tokens[$stackPtr]['scope_opener']]['code'] === T_COLON
        ) {
            $isAlternative = true;
        }

        // Single space after the keyword.
        $expected = 1;
        if (isset($tokens[$stackPtr]['parenthesis_closer']) === false && $isAlternative === true) {
            // Catching cases like:
            // if (condition) : ... else: ... endif
            // where there is no condition.
            $expected = (int) $this->requiredSpacesBeforeColon;
        }

        $found = 1;
        if ($tokens[($stackPtr + 1)]['code'] !== T_WHITESPACE) {
            $found = 0;
        } elseif ($tokens[($stackPtr + 1)]['content'] !== ' ') {
            if (strpos($tokens[($stackPtr + 1)]['content'], $phpcsFile->eolChar) !== false) {
                $found = 'newline';
            } else {
                $found = $tokens[($stackPtr + 1)]['length'];
            }
        }

        if ($found !== $expected) {
            $pluralizeSpace = 's';
            if ($expected === 1) {
                $pluralizeSpace = '';
            }

            $error = 'Expected %s space%s after %s keyword; %s found';
            $data  = [
                $expected,
                $pluralizeSpace,
                strtoupper($tokens[$stackPtr]['content']),
                $found,
            ];

            $fix = $phpcsFile->addFixableError($error, $stackPtr, 'SpaceAfterKeyword', $data);
            if ($fix === true) {
                if ($found === 0) {
                    $phpcsFile->fixer->addContent($stackPtr, str_repeat(' ', $expected));
                } else {
                    $phpcsFile->fixer->replaceToken(($stackPtr + 1), str_repeat(' ', $expected));
                }
            }
        }

        // Single space after closing parenthesis.
        if (isset($tokens[$stackPtr]['parenthesis_closer']) === true
            && isset($tokens[$stackPtr]['scope_opener']) === true
        ) {
            $expected = 1;
            if ($isAlternative === true) {
                $expected = (int) $this->requiredSpacesBeforeColon;
            }

            $closer  = $tokens[$stackPtr]['parenthesis_closer'];
            $opener  = $tokens[$stackPtr]['scope_opener'];
            $content = $phpcsFile->getTokensAsString(($closer + 1), ($opener - $closer - 1));

            if (trim($content) === '') {
                if (strpos($content, $phpcsFile->eolChar) !== false) {
                    $found = 'newline';
                } else {
                    $found = strlen($content);
                }
            } else {
                $found = '"' . str_replace($phpcsFile->eolChar, '\n', $content) . '"';
            }

            if ($found !== $expected) {
                $pluralizeSpace = 's';
                if ($expected === 1) {
                    $pluralizeSpace = '';
                }

                $error = 'Expected %s space%s after closing parenthesis; found %s';
                $data  = [
                    $expected,
                    $pluralizeSpace,
                    $found,
                ];

                $fix = $phpcsFile->addFixableError($error, $closer, 'SpaceAfterCloseParenthesis', $data);
                if ($fix === true) {
                    $padding = str_repeat(' ', $expected);
                    if ($closer === ($opener - 1)) {
                        $phpcsFile->fixer->addContent($closer, $padding);
                    } else {
                        $phpcsFile->fixer->beginChangeset();
                        if (trim($content) === '') {
                            $phpcsFile->fixer->addContent($closer, $padding);
                            if ($found !== 0) {
                                for ($i = ($closer + 1); $i < $opener; $i++) {
                                    $phpcsFile->fixer->replaceToken($i, '');
                                }
                            }
                        } else {
                            $phpcsFile->fixer->addContent($closer, $padding . $tokens[$opener]['content']);
                            $phpcsFile->fixer->replaceToken($opener, '');

                            if ($tokens[$opener]['line'] !== $tokens[$closer]['line']) {
                                $next = $phpcsFile->findNext(T_WHITESPACE, ($opener + 1), null, true);
                                if ($tokens[$next]['line'] !== $tokens[$opener]['line']) {
                                    for ($i = ($opener + 1); $i < $next; $i++) {
                                        $phpcsFile->fixer->replaceToken($i, '');
                                    }
                                }
                            }
                        }

                        $phpcsFile->fixer->endChangeset();
                    }
                }
            }
        }

        // Single newline after opening brace.
        if (isset($tokens[$stackPtr]['scope_opener']) === true) {
            $opener = $tokens[$stackPtr]['scope_opener'];
            for ($next = ($opener + 1); $next < $phpcsFile->numTokens; $next++) {
                $code = $tokens[$next]['code'];

                if ($code === T_WHITESPACE
                    || ($code === T_INLINE_HTML
                    && trim($tokens[$next]['content']) === '')
                ) {
                    continue;
                }

                // Skip all empty tokens on the same line as the opener.
                if ($tokens[$next]['line'] === $tokens[$opener]['line']
                    && (isset(Tokens::EMPTY_TOKENS[$code]) === true
                    || $code === T_CLOSE_TAG)
                ) {
                    continue;
                }

                // We found the first bit of a code, or a comment on the
                // following line.
                break;
            }

            if ($tokens[$next]['line'] === $tokens[$opener]['line']) {
                $error = 'Newline required after opening brace';
                $fix   = $phpcsFile->addFixableError($error, $opener, 'NewlineAfterOpenBrace');
                if ($fix === true) {
                    $phpcsFile->fixer->beginChangeset();
                    for ($i = ($opener + 1); $i < $next; $i++) {
                        if (trim($tokens[$i]['content']) !== '') {
                            break;
                        }

                        // Remove whitespace.
                        $phpcsFile->fixer->replaceToken($i, '');
                    }

                    $phpcsFile->fixer->addContent($opener, $phpcsFile->eolChar);
                    $phpcsFile->fixer->endChangeset();
                }
            }
        } elseif ($tokens[$stackPtr]['code'] === T_WHILE) {
            // Zero spaces after parenthesis closer, but only if followed by a semicolon.
            $closer       = $tokens[$stackPtr]['parenthesis_closer'];
            $nextNonEmpty = $phpcsFile->findNext(Tokens::EMPTY_TOKENS, ($closer + 1), null, true);
            if ($nextNonEmpty !== false && $tokens[$nextNonEmpty]['code'] === T_SEMICOLON) {
                $found = 0;
                if ($tokens[($closer + 1)]['code'] === T_WHITESPACE) {
                    if (strpos($tokens[($closer + 1)]['content'], $phpcsFile->eolChar) !== false) {
                        $found = 'newline';
                    } else {
                        $found = $tokens[($closer + 1)]['length'];
                    }
                }

                if ($found !== 0) {
                    $error = 'Expected 0 spaces before semicolon; %s found';
                    $data  = [$found];
                    $fix   = $phpcsFile->addFixableError($error, $closer, 'SpaceBeforeSemicolon', $data);
                    if ($fix === true) {
                        $phpcsFile->fixer->replaceToken(($closer + 1), '');
                    }
                }
            }
        }

        // Only want to check multi-keyword structures from here on.
        if ($tokens[$stackPtr]['code'] === T_WHILE) {
            if (isset($tokens[$stackPtr]['scope_closer']) !== false) {
                return;
            }

            $closer = $phpcsFile->findPrevious(Tokens::EMPTY_TOKENS, ($stackPtr - 1), null, true);
            if ($closer === false
                || $tokens[$closer]['code'] !== T_CLOSE_CURLY_BRACKET
                || $tokens[$tokens[$closer]['scope_condition']]['code'] !== T_DO
            ) {
                return;
            }
        } elseif ($tokens[$stackPtr]['code'] === T_ELSE
            || $tokens[$stackPtr]['code'] === T_ELSEIF
            || $tokens[$stackPtr]['code'] === T_CATCH
            || $tokens[$stackPtr]['code'] === T_FINALLY
        ) {
            if (isset($tokens[$stackPtr]['scope_opener']) === true
                && $tokens[$tokens[$stackPtr]['scope_opener']]['code'] === T_COLON
            ) {
                // Special case for alternate syntax, where this token is actually
                // the closer for the previous block, so there is no spacing to check.
                return;
            }

            $closer = $phpcsFile->findPrevious(Tokens::EMPTY_TOKENS, ($stackPtr - 1), null, true);
            if ($closer === false || $tokens[$closer]['code'] !== T_CLOSE_CURLY_BRACKET) {
                return;
            }
        } else {
            return;
        }

        // Single space after closing brace.
        $found = 1;
        if ($tokens[($closer + 1)]['code'] !== T_WHITESPACE) {
            $found = 0;
        } elseif ($tokens[$closer]['line'] !== $tokens[$stackPtr]['line']) {
            $found = 'newline';
        } elseif ($tokens[($closer + 1)]['content'] !== ' ') {
            $found = $tokens[($closer + 1)]['length'];
        }

        if ($found !== 1) {
            $error = 'Expected 1 space after closing brace; %s found';
            $data  = [$found];

            if ($phpcsFile->findNext(Tokens::COMMENT_TOKENS, ($closer + 1), $stackPtr) !== false) {
                // Comment found between closing brace and keyword, don't auto-fix.
                $phpcsFile->addError($error, $closer, 'SpaceAfterCloseBrace', $data);
                return;
            }

            $fix = $phpcsFile->addFixableError($error, $closer, 'SpaceAfterCloseBrace', $data);
            if ($fix === true) {
                if ($found === 0) {
                    $phpcsFile->fixer->addContent($closer, ' ');
                } else {
                    $phpcsFile->fixer->replaceToken(($closer + 1), ' ');
                }
            }
        }
    }
}
