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<?php
/**
 * Copyright (C) 2019 Xibo Signage Ltd
 *
 * Xibo - Digital Signage - http://www.xibo.org.uk
 *
 * This file is part of Xibo.
 *
 * Xibo is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * any later version.
 *
 * Xibo is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with Xibo.  If not, see <http://www.gnu.org/licenses/>.
 */

namespace Xibo\Twig;
use Twig\Compiler;
use Twig\Node\CheckToStringNode;
use Twig\Node\Expression\AbstractExpression;
use Twig\Node\Expression\ConstantExpression;
use Twig\Node\Expression\FilterExpression;
use Twig\Node\Expression\NameExpression;
use Twig\Node\Expression\TempNameExpression;
use Twig\Node\Node;
use Twig\Node\PrintNode;

class TransNode extends Node
{
    public function __construct(Node $body, Node $plural = null, AbstractExpression $count = null, Node $notes = null, $lineno, $tag = null)
    {
        $nodes = ['body' => $body];
        if (null !== $count) {
            $nodes['count'] = $count;
        }
        if (null !== $plural) {
            $nodes['plural'] = $plural;
        }
        if (null !== $notes) {
            $nodes['notes'] = $notes;
        }
        parent::__construct($nodes, [], $lineno, $tag);
    }

/**
     * Compiles the node to PHP.
     *
     * @param \Twig\Compiler $compiler A Twig_Compiler instance
     */
    public function compile(Compiler $compiler)
    {
        $compiler->addDebugInfo($this);

list($msg, $vars) = $this->compileString($this->getNode('body'));

if ($this->hasNode('plural')) {
            list($msg1, $vars1) = $this->compileString($this->getNode('plural'));
            $vars = array_merge($vars, $vars1);
        }

$function = $this->getTransFunction($this->hasNode('plural'));

if ($this->hasNode('notes')) {
            $message = trim($this->getNode('notes')->getAttribute('data'));
            // line breaks are not allowed cause we want a single line comment
            $message = str_replace(["\n", "\r"], ' ', $message);
            $compiler->write("// notes: {$message}\n");
        }

if ($vars) {
            // Add a hint for xgettext so that poedit goes not treat the variable substitution as PHP format
            // https://github.com/xibosignage/xibo/issues/1284
            $compiler
                ->write('/* xgettext:no-php-format */')
                ->write('echo strtr(' . $function . '(')
                ->subcompile($msg);
            ;
            if ($this->hasNode('plural')) {
                $compiler
                    ->raw(', ')
                    ->subcompile($msg1)
                    ->raw(', abs(')
                    ->subcompile($this->hasNode('count') ? $this->getNode('count') : null)
                    ->raw(')')
                ;
            }

$compiler->raw('), array(');

foreach ($vars as $var) {
                if ('count' === $var->getAttribute('name')) {
                    $compiler
                        ->string('%count%')
                        ->raw(' => abs(')
                        ->subcompile($this->hasNode('count') ? $this->getNode('count') : null)
                        ->raw('), ')
                    ;
                } else {
                    $compiler
                        ->string('%'.$var->getAttribute('name').'%')
                        ->raw(' => ')
                        ->subcompile($var)
                        ->raw(', ')
                    ;
                }
            }
            $compiler->raw("));\n");
        } else {
            $compiler
                ->write('echo '.$function.'(')
                ->subcompile($msg)
            ;
            if ($this->hasNode('plural')) {
                $compiler
                    ->raw(', ')
                    ->subcompile($msg1)
                    ->raw(', abs(')
                    ->subcompile($this->hasNode('count') ? $this->getNode('count') : null)
                    ->raw(')')
                ;
            }

$compiler->raw(");\n");
        }
    }

/**
     * @param Node $body A Twig_Node instance
     *
     * @return array
     */
    private function compileString(Node $body): array
    {
        if ($body instanceof NameExpression || $body instanceof ConstantExpression || $body instanceof TempNameExpression) {
            return [$body, []];
        }
        $vars = [];
        if (\count($body)) {
            $msg = '';
            foreach ($body as $node) {
                if ($node instanceof PrintNode) {
                    $n = $node->getNode('expr');
                    while ($n instanceof FilterExpression) {
                        $n = $n->getNode('node');
                    }
                    while ($n instanceof CheckToStringNode) {
                        $n = $n->getNode('expr');
                    }
                    $msg .= sprintf('%%%s%%', $n->getAttribute('name'));
                    $vars[] = new NameExpression($n->getAttribute('name'), $n->getTemplateLine());
                } else {
                    $msg .= $node->getAttribute('data');
                }
            }
        } else {
            $msg = $body->getAttribute('data');
        }
        return [new Node([new ConstantExpression(trim($msg), $body->getTemplateLine())]), $vars];
    }

private function getTransFunction(bool $plural): string
    {
        return $plural ? 'n__' : '__';
    }
}