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<?php

declare(strict_types=1);

/*
 * This file is part of PHP CS Fixer.
 *
 * (c) Fabien Potencier <[email protected]>
 *     Dariusz Rumiński <[email protected]>
 *
 * This source file is subject to the MIT license that is bundled
 * with this source code in the file LICENSE.
 */

namespace PhpCsFixer\Fixer\Import;

use PhpCsFixer\AbstractFixer;
use PhpCsFixer\FixerDefinition\CodeSample;
use PhpCsFixer\FixerDefinition\FixerDefinition;
use PhpCsFixer\FixerDefinition\FixerDefinitionInterface;
use PhpCsFixer\Preg;
use PhpCsFixer\Tokenizer\Analyzer\Analysis\NamespaceAnalysis;
use PhpCsFixer\Tokenizer\Analyzer\Analysis\NamespaceUseAnalysis;
use PhpCsFixer\Tokenizer\Analyzer\GotoLabelAnalyzer;
use PhpCsFixer\Tokenizer\Analyzer\NamespaceUsesAnalyzer;
use PhpCsFixer\Tokenizer\CT;
use PhpCsFixer\Tokenizer\Token;
use PhpCsFixer\Tokenizer\Tokens;
use PhpCsFixer\Tokenizer\TokensAnalyzer;

/**
 * @author Dariusz Rumiński <[email protected]>
 */
final class NoUnusedImportsFixer extends AbstractFixer
{
    public function getDefinition(): FixerDefinitionInterface
    {
        return new FixerDefinition(
            'Unused `use` statements must be removed.',
            [new CodeSample("<?php\nuse \\DateTime;\nuse \\Exception;\n\nnew DateTime();\n")]
        );
    }

    /**
     * {@inheritdoc}
     *
     * Must run before BlankLineAfterNamespaceFixer, NoExtraBlankLinesFixer, NoLeadingImportSlashFixer, SingleLineAfterImportsFixer.
     * Must run after ClassKeywordRemoveFixer, GlobalNamespaceImportFixer, PhpUnitDedicateAssertFixer, PhpUnitFqcnAnnotationFixer, SingleImportPerStatementFixer.
     */
    public function getPriority(): int
    {
        return -10;
    }

    public function isCandidate(Tokens $tokens): bool
    {
        return $tokens->isTokenKindFound(T_USE);
    }

    protected function applyFix(\SplFileInfo $file, Tokens $tokens): void
    {
        $useDeclarations = (new NamespaceUsesAnalyzer())->getDeclarationsFromTokens($tokens);

        if (0 === \count($useDeclarations)) {
            return;
        }

        foreach ($tokens->getNamespaceDeclarations() as $namespace) {
            $currentNamespaceUseDeclarations = [];
            $currentNamespaceUseDeclarationIndices = [];

            foreach ($useDeclarations as $useDeclaration) {
                if ($useDeclaration->getStartIndex() >= $namespace->getScopeStartIndex() && $useDeclaration->getEndIndex() <= $namespace->getScopeEndIndex()) {
                    $currentNamespaceUseDeclarations[] = $useDeclaration;
                    $currentNamespaceUseDeclarationIndices[$useDeclaration->getStartIndex()] = $useDeclaration->getEndIndex();
                }
            }

            foreach ($currentNamespaceUseDeclarations as $useDeclaration) {
                if (!$this->isImportUsed($tokens, $namespace, $useDeclaration, $currentNamespaceUseDeclarationIndices)) {
                    $this->removeUseDeclaration($tokens, $useDeclaration);
                }
            }

            $this->removeUsesInSameNamespace($tokens, $currentNamespaceUseDeclarations, $namespace);
        }
    }

    /**
     * @param array<int, int> $ignoredIndices indices of the use statements themselves that should not be checked as being "used"
     */
    private function isImportUsed(Tokens $tokens, NamespaceAnalysis $namespace, NamespaceUseAnalysis $import, array $ignoredIndices): bool
    {
        $analyzer = new TokensAnalyzer($tokens);
        $gotoLabelAnalyzer = new GotoLabelAnalyzer();

        $tokensNotBeforeFunctionCall = [T_NEW];

        $attributeIsDefined = \defined('T_ATTRIBUTE');

        if ($attributeIsDefined) { // @TODO: drop condition when PHP 8.0+ is required
            $tokensNotBeforeFunctionCall[] = T_ATTRIBUTE;
        }

        $namespaceEndIndex = $namespace->getScopeEndIndex();
        $inAttribute = false;

        for ($index = $namespace->getScopeStartIndex(); $index <= $namespaceEndIndex; ++$index) {
            $token = $tokens[$index];

            if ($attributeIsDefined && $token->isGivenKind(T_ATTRIBUTE)) {
                $inAttribute = true;

                continue;
            }

            if ($attributeIsDefined && $token->isGivenKind(CT::T_ATTRIBUTE_CLOSE)) {
                $inAttribute = false;

                continue;
            }

            if (isset($ignoredIndices[$index])) {
                $index = $ignoredIndices[$index];

                continue;
            }

            if ($token->isGivenKind(T_STRING)) {
                if (0 !== strcasecmp($import->getShortName(), $token->getContent())) {
                    continue;
                }

                $prevMeaningfulToken = $tokens[$tokens->getPrevMeaningfulToken($index)];

                if ($prevMeaningfulToken->isGivenKind(T_NAMESPACE)) {
                    $index = $tokens->getNextTokenOfKind($index, [';', '{', [T_CLOSE_TAG]]);

                    continue;
                }

                if (
                    $prevMeaningfulToken->isGivenKind([T_NS_SEPARATOR, T_FUNCTION, T_CONST, T_DOUBLE_COLON])
                    || $prevMeaningfulToken->isObjectOperator()
                ) {
                    continue;
                }

                if ($inAttribute) {
                    return true;
                }

                $nextMeaningfulIndex = $tokens->getNextMeaningfulToken($index);

                if ($gotoLabelAnalyzer->belongsToGoToLabel($tokens, $nextMeaningfulIndex)) {
                    continue;
                }

                $nextMeaningfulToken = $tokens[$nextMeaningfulIndex];

                if ($analyzer->isConstantInvocation($index)) {
                    $type = NamespaceUseAnalysis::TYPE_CONSTANT;
                } elseif ($nextMeaningfulToken->equals('(') && !$prevMeaningfulToken->isGivenKind($tokensNotBeforeFunctionCall)) {
                    $type = NamespaceUseAnalysis::TYPE_FUNCTION;
                } else {
                    $type = NamespaceUseAnalysis::TYPE_CLASS;
                }

                if ($import->getType() === $type) {
                    return true;
                }

                continue;
            }

            if ($token->isComment()
                && Preg::match(
                    '/(?<![[:alnum:]\$])(?<!\\\\)'.$import->getShortName().'(?![[:alnum:]])/i',
                    $token->getContent()
                )
            ) {
                return true;
            }
        }

        return false;
    }

    private function removeUseDeclaration(Tokens $tokens, NamespaceUseAnalysis $useDeclaration): void
    {
        for ($index = $useDeclaration->getEndIndex() - 1; $index >= $useDeclaration->getStartIndex(); --$index) {
            if ($tokens[$index]->isComment()) {
                continue;
            }

            if (!$tokens[$index]->isWhitespace() || !str_contains($tokens[$index]->getContent(), "\n")) {
                $tokens->clearTokenAndMergeSurroundingWhitespace($index);

                continue;
            }

            // when multi line white space keep the line feed if the previous token is a comment
            $prevIndex = $tokens->getPrevNonWhitespace($index);

            if ($tokens[$prevIndex]->isComment()) {
                $content = $tokens[$index]->getContent();
                $tokens[$index] = new Token([T_WHITESPACE, substr($content, strrpos($content, "\n"))]); // preserve indent only
            } else {
                $tokens->clearTokenAndMergeSurroundingWhitespace($index);
            }
        }

        if ($tokens[$useDeclaration->getEndIndex()]->equals(';')) { // do not remove `? >`
            $tokens->clearAt($useDeclaration->getEndIndex());
        }

        // remove white space above and below where the `use` statement was

        $prevIndex = $useDeclaration->getStartIndex() - 1;
        $prevToken = $tokens[$prevIndex];

        if ($prevToken->isWhitespace()) {
            $content = rtrim($prevToken->getContent(), " \t");

            $tokens->ensureWhitespaceAtIndex($prevIndex, 0, $content);

            $prevToken = $tokens[$prevIndex];
        }

        if (!isset($tokens[$useDeclaration->getEndIndex() + 1])) {
            return;
        }

        $nextIndex = $tokens->getNonEmptySibling($useDeclaration->getEndIndex(), 1);

        if (null === $nextIndex) {
            return;
        }

        $nextToken = $tokens[$nextIndex];

        if ($nextToken->isWhitespace()) {
            $content = Preg::replace(
                "#^\r\n|^\n#",
                '',
                ltrim($nextToken->getContent(), " \t"),
                1
            );

            $tokens->ensureWhitespaceAtIndex($nextIndex, 0, $content);

            $nextToken = $tokens[$nextIndex];
        }

        if ($prevToken->isWhitespace() && $nextToken->isWhitespace()) {
            $content = $prevToken->getContent().$nextToken->getContent();

            $tokens->ensureWhitespaceAtIndex($nextIndex, 0, $content);

            $tokens->clearAt($prevIndex);
        }
    }

    /**
     * @param list<NamespaceUseAnalysis> $useDeclarations
     */
    private function removeUsesInSameNamespace(Tokens $tokens, array $useDeclarations, NamespaceAnalysis $namespaceDeclaration): void
    {
        $namespace = $namespaceDeclaration->getFullName();
        $nsLength = \strlen($namespace.'\\');

        foreach ($useDeclarations as $useDeclaration) {
            if ($useDeclaration->isAliased()) {
                continue;
            }

            $useDeclarationFullName = ltrim($useDeclaration->getFullName(), '\\');

            if (!str_starts_with($useDeclarationFullName, $namespace.'\\')) {
                continue;
            }

            $partName = substr($useDeclarationFullName, $nsLength);

            if (!str_contains($partName, '\\')) {
                $this->removeUseDeclaration($tokens, $useDeclaration);
            }
        }
    }
}