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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\Tokenizer\Processor;

use PhpCsFixer\Tokenizer\CT;
use PhpCsFixer\Tokenizer\Token;
use PhpCsFixer\Tokenizer\Tokens;
use PhpCsFixer\WhitespacesFixerConfig;

/**
 * @author Greg Korba <[email protected]>
 */
final class ImportProcessor
{
    private WhitespacesFixerConfig $whitespacesConfig;

    public function __construct(WhitespacesFixerConfig $whitespacesConfig)
    {
        $this->whitespacesConfig = $whitespacesConfig;
    }

    /**
     * @param array{
     *     const?: array<int|string, class-string>,
     *     class?: array<int|string, class-string>,
     *     function?: array<int|string, class-string>
     * } $imports
     */
    public function insertImports(Tokens $tokens, array $imports, int $atIndex): void
    {
        $lineEnding = $this->whitespacesConfig->getLineEnding();

        if (!$tokens[$atIndex]->isWhitespace() || !str_contains($tokens[$atIndex]->getContent(), "\n")) {
            $tokens->insertAt($atIndex, new Token([T_WHITESPACE, $lineEnding]));
        }

        foreach ($imports as $type => $typeImports) {
            sort($typeImports);

            $items = [];

            foreach ($typeImports as $name) {
                $items = array_merge($items, [
                    new Token([T_WHITESPACE, $lineEnding]),
                    new Token([T_USE, 'use']),
                    new Token([T_WHITESPACE, ' ']),
                ]);

                if ('const' === $type) {
                    $items[] = new Token([CT::T_CONST_IMPORT, 'const']);
                    $items[] = new Token([T_WHITESPACE, ' ']);
                } elseif ('function' === $type) {
                    $items[] = new Token([CT::T_FUNCTION_IMPORT, 'function']);
                    $items[] = new Token([T_WHITESPACE, ' ']);
                }

                $items = array_merge($items, self::tokenizeName($name));
                $items[] = new Token(';');
            }

            $tokens->insertAt($atIndex, $items);
        }
    }

    /**
     * @param class-string $name
     *
     * @return list<Token>
     */
    public static function tokenizeName(string $name): array
    {
        $parts = explode('\\', $name);
        $newTokens = [];

        if ('' === $parts[0]) {
            $newTokens[] = new Token([T_NS_SEPARATOR, '\\']);
            array_shift($parts);
        }

        foreach ($parts as $part) {
            $newTokens[] = new Token([T_STRING, $part]);
            $newTokens[] = new Token([T_NS_SEPARATOR, '\\']);
        }

        array_pop($newTokens);

        return $newTokens;
    }
}