<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Bridge\Twig\NodeVisitor;

use Symfony\Bridge\Twig\Node\TransDefaultDomainNode;
use Symfony\Bridge\Twig\Node\TransNode;
use Twig\Environment;
use Twig\Node\BlockNode;
use Twig\Node\Expression\ArrayExpression;
use Twig\Node\Expression\AssignNameExpression;
use Twig\Node\Expression\ConstantExpression;
use Twig\Node\Expression\FilterExpression;
use Twig\Node\Expression\NameExpression;
use Twig\Node\ModuleNode;
use Twig\Node\Node;
use Twig\Node\SetNode;
use Twig\NodeVisitor\AbstractNodeVisitor;

/**
 * @author Fabien Potencier <fabien@symfony.com>
 */
final class TranslationDefaultDomainNodeVisitor extends AbstractNodeVisitor
{
    private $scope;

    public function __construct()
    {
        $this->scope = new Scope();
    }

    /**
     * {@inheritdoc}
     */
    protected function doEnterNode(Node $node, Environment $env): Node
    {
        if ($node instanceof BlockNode || $node instanceof ModuleNode) {
            $this->scope = $this->scope->enter();
        }

        if ($node instanceof TransDefaultDomainNode) {
            if ($node->getNode('expr') instanceof ConstantExpression) {
                $this->scope->set('domain', $node->getNode('expr'));

                return $node;
            } else {
                $var = $this->getVarName();
                $name = new AssignNameExpression($var, $node->getTemplateLine());
                $this->scope->set('domain', new NameExpression($var, $node->getTemplateLine()));

                return new SetNode(false, new Node([$name]), new Node([$node->getNode('expr')]), $node->getTemplateLine());
            }
        }

        if (!$this->scope->has('domain')) {
            return $node;
        }

        if ($node instanceof FilterExpression && 'trans' === $node->getNode('filter')->getAttribute('value')) {
            $arguments = $node->getNode('arguments');
            if ($this->isNamedArguments($arguments)) {
                if (!$arguments->hasNode('domain') && !$arguments->hasNode(1)) {
                    $arguments->setNode('domain', $this->scope->get('domain'));
                }
            } elseif (!$arguments->hasNode(1)) {
                if (!$arguments->hasNode(0)) {
                    $arguments->setNode(0, new ArrayExpression([], $node->getTemplateLine()));
                }

                $arguments->setNode(1, $this->scope->get('domain'));
            }
        } elseif ($node instanceof TransNode) {
            if (!$node->hasNode('domain')) {
                $node->setNode('domain', $this->scope->get('domain'));
            }
        }

        return $node;
    }

    /**
     * {@inheritdoc}
     */
    protected function doLeaveNode(Node $node, Environment $env): ?Node
    {
        if ($node instanceof TransDefaultDomainNode) {
            return null;
        }

        if ($node instanceof BlockNode || $node instanceof ModuleNode) {
            $this->scope = $this->scope->leave();
        }

        return $node;
    }

    /**
     * {@inheritdoc}
     */
    public function getPriority(): int
    {
        return -10;
    }

    private function isNamedArguments(Node $arguments): bool
    {
        foreach ($arguments as $name => $node) {
            if (!\is_int($name)) {
                return true;
            }
        }

        return false;
    }

    private function getVarName(): string
    {
        return sprintf('__internal_%s', hash('sha256', uniqid(mt_rand(), true), false));
    }
}