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<?php

declare (strict_types=1);
namespace Rector\Php70\Rector\Assign;

use PhpParser\Node;
use PhpParser\Node\Expr;
use PhpParser\Node\Expr\ArrayDimFetch;
use PhpParser\Node\Expr\ArrayItem;
use PhpParser\Node\Expr\Assign;
use PhpParser\Node\Expr\FuncCall;
use PhpParser\Node\Expr\List_;
use Rector\Core\PhpParser\Printer\BetterStandardPrinter;
use Rector\Core\Rector\AbstractRector;
use Rector\Core\ValueObject\PhpVersionFeature;
use Rector\VersionBonding\Contract\MinPhpVersionInterface;
use Symplify\RuleDocGenerator\ValueObject\CodeSample\CodeSample;
use Symplify\RuleDocGenerator\ValueObject\RuleDefinition;
/**
 * @changelog http://php.net/manual/en/migration70.incompatible.php#migration70.incompatible.variable-handling.list
 * @see \Rector\Tests\Php70\Rector\Assign\ListSwapArrayOrderRector\ListSwapArrayOrderRectorTest
 */
final class ListSwapArrayOrderRector extends AbstractRector implements MinPhpVersionInterface
{
    /**
     * @readonly
     * @var \Rector\Core\PhpParser\Printer\BetterStandardPrinter
     */
    private $betterStandardPrinter;
    public function __construct(BetterStandardPrinter $betterStandardPrinter)
    {
        $this->betterStandardPrinter = $betterStandardPrinter;
    }
    public function getRuleDefinition() : RuleDefinition
    {
        return new RuleDefinition('list() assigns variables in reverse order - relevant in array assign', [new CodeSample('list($a[], $a[]) = [1, 2];', 'list($a[], $a[]) = array_reverse([1, 2]);')]);
    }
    /**
     * @return array<class-string<Node>>
     */
    public function getNodeTypes() : array
    {
        return [Assign::class];
    }
    /**
     * @param Assign $node
     */
    public function refactor(Node $node) : ?Node
    {
        if ($this->shouldSkipAssign($node)) {
            return null;
        }
        /** @var List_ $list */
        $list = $node->var;
        $printedVariables = [];
        foreach ($list->items as $arrayItem) {
            if (!$arrayItem instanceof ArrayItem) {
                continue;
            }
            if ($arrayItem->value instanceof ArrayDimFetch && !$arrayItem->value->dim instanceof Expr) {
                $printedVariables[] = $this->betterStandardPrinter->print($arrayItem->value->var);
            } else {
                return null;
            }
        }
        // relevant only in 1 variable type
        $uniqueVariables = \array_unique($printedVariables);
        if (\count($uniqueVariables) !== 1) {
            return null;
        }
        // wrap with array_reverse, to reflect reverse assign order in left
        $node->expr = $this->nodeFactory->createFuncCall('array_reverse', [$node->expr]);
        return $node;
    }
    public function provideMinPhpVersion() : int
    {
        return PhpVersionFeature::LIST_SWAP_ORDER;
    }
    private function shouldSkipAssign(Assign $assign) : bool
    {
        if (!$assign->var instanceof List_) {
            return \true;
        }
        // already converted
        return $assign->expr instanceof FuncCall && $this->isName($assign->expr, 'array_reverse');
    }
}