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name : Namespace_.php
 <?php

namespace Archetype\Endpoints\PHP;

use Archetype\Endpoints\EndpointProvider;
use PhpParser\BuilderFactory;

class Namespace_ extends EndpointProvider
{
    /**
     * @example Get file namespace
     * @source $file->namespace()
     *
     * @example Set file namespace
     * @source $file->namespace('App\Models')
     *
     * @example Remove file namespace
     * @source $file->remove()->namespace()
     *
     * @param string $value
     * @return mixed
     */
    public function namespace(string $value = null)
    {
        if ($this->file->directive('remove')) {
            return $this->remove();
        }

        if ($value === null) {
            return $this->get();
        }

        return $this->set($value);
    }

    protected function get()
    {
        return $this->file->astQuery()
            ->namespace()
            ->remember('formatted_namespace', fn ($node) => $node->name)
            ->recall('formatted_namespace')
            ->first();
    }

    protected function set(string $newNamespace)
    {
        $namespace = $this->file->astQuery()
            ->namespace()
            ->first();
        
        if ($namespace) {
            // Modifying existing namespace
            $namespace->name->name = $newNamespace;
        } else {
            // Add a namespace
            $ast = $this->file->ast();
            array_unshift(
                $ast,
                (new BuilderFactory)->namespace($newNamespace)->getNode()
            );

            $this->file->ast($ast);
        }
        
        return $this->file->continue();
    }

    protected function remove()
    {
        $namespace = $this->file->astQuery()->namespace()->first();
        
        // using remove()->namespace() should NOT remove underlying statements
        // humans would not expect that
        // instead just unwrap the statements
        // this assumes 0 or 1 namespaces
        if ($namespace) {
            $this->file->ast($namespace->stmts);
        }

        return $this->file->continue();
    }
}
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