<?php

declare (strict_types=1);
namespace Rector\TypeDeclaration\NodeAnalyzer;

use PhpParser\Node;
use PhpParser\Node\Arg;
use PhpParser\Node\ComplexType;
use PhpParser\Node\Expr;
use PhpParser\Node\Expr\FuncCall;
use PhpParser\Node\Expr\MethodCall;
use PhpParser\Node\Expr\StaticCall;
use PhpParser\Node\Expr\Variable;
use PhpParser\Node\Identifier;
use PhpParser\Node\IntersectionType;
use PhpParser\Node\Name;
use PhpParser\Node\NullableType;
use PhpParser\Node\Param;
use PhpParser\Node\Stmt\ClassMethod;
use PhpParser\Node\UnionType;
use PHPStan\Analyser\Scope;
use PHPStan\Reflection\ClassReflection;
use PHPStan\Type\MixedType;
use Rector\NodeNameResolver\NodeNameResolver;
use Rector\NodeTypeResolver\TypeComparator\TypeComparator;
use Rector\PhpParser\AstResolver;
use Rector\StaticTypeMapper\StaticTypeMapper;
final class CallerParamMatcher
{
    /**
     * @readonly
     */
    private NodeNameResolver $nodeNameResolver;
    /**
     * @readonly
     */
    private AstResolver $astResolver;
    /**
     * @readonly
     */
    private StaticTypeMapper $staticTypeMapper;
    /**
     * @readonly
     */
    private TypeComparator $typeComparator;
    public function __construct(NodeNameResolver $nodeNameResolver, AstResolver $astResolver, StaticTypeMapper $staticTypeMapper, TypeComparator $typeComparator)
    {
        $this->nodeNameResolver = $nodeNameResolver;
        $this->astResolver = $astResolver;
        $this->staticTypeMapper = $staticTypeMapper;
        $this->typeComparator = $typeComparator;
    }
    /**
     * @return null|\PhpParser\Node\Identifier|\PhpParser\Node\Name|\PhpParser\Node\NullableType|\PhpParser\Node\UnionType|\PhpParser\Node\ComplexType
     */
    public function matchCallParamType(Param $param, Param $callParam)
    {
        if (!$callParam->type instanceof Node) {
            return null;
        }
        if (!$param->default instanceof Expr && !$callParam->default instanceof Expr) {
            // skip as mixed is not helpful and possibly requires more precise change elsewhere
            if ($this->isCallParamMixed($callParam->type)) {
                return null;
            }
            return $callParam->type;
        }
        $default = $param->default ?? $callParam->default;
        if (!$default instanceof Expr) {
            return null;
        }
        $callParamType = $this->staticTypeMapper->mapPhpParserNodePHPStanType($callParam->type);
        $defaultType = $this->staticTypeMapper->mapPhpParserNodePHPStanType($default);
        if ($this->typeComparator->areTypesEqual($callParamType, $defaultType)) {
            return $callParam->type;
        }
        if ($this->typeComparator->isSubtype($defaultType, $callParamType)) {
            return $callParam->type;
        }
        if (!$defaultType->isNull()->yes()) {
            return null;
        }
        if ($callParam->type instanceof Name || $callParam->type instanceof Identifier) {
            return new NullableType($callParam->type);
        }
        if ($callParam->type instanceof IntersectionType || $callParam->type instanceof UnionType) {
            return new UnionType(array_merge($callParam->type->types, [new Identifier('null')]));
        }
        return null;
    }
    public function matchParentParam(StaticCall $parentStaticCall, Param $param, Scope $scope): ?Param
    {
        $methodName = $this->nodeNameResolver->getName($parentStaticCall->name);
        if ($methodName === null) {
            return null;
        }
        // match current param to parent call position
        $parentStaticCallArgPosition = $this->matchCallArgPosition($parentStaticCall, $param);
        if ($parentStaticCallArgPosition === null) {
            return null;
        }
        return $this->resolveParentMethodParam($scope, $methodName, $parentStaticCallArgPosition);
    }
    /**
     * @param \PhpParser\Node\Expr\StaticCall|\PhpParser\Node\Expr\MethodCall|\PhpParser\Node\Expr\FuncCall $call
     */
    public function matchCallParam($call, Param $param): ?Param
    {
        $callArgPosition = $this->matchCallArgPosition($call, $param);
        if ($callArgPosition === null) {
            return null;
        }
        $classMethodOrFunction = $this->astResolver->resolveClassMethodOrFunctionFromCall($call);
        if ($classMethodOrFunction === null) {
            return null;
        }
        return $classMethodOrFunction->params[$callArgPosition] ?? null;
    }
    /**
     * @param \PhpParser\Node\Expr\StaticCall|\PhpParser\Node\Expr\MethodCall|\PhpParser\Node\Expr\FuncCall $call
     */
    private function matchCallArgPosition($call, Param $param): ?int
    {
        $paramName = $this->nodeNameResolver->getName($param);
        foreach ($call->args as $argPosition => $arg) {
            if (!$arg instanceof Arg) {
                continue;
            }
            if (!$arg->value instanceof Variable) {
                continue;
            }
            if (!$this->nodeNameResolver->isName($arg->value, $paramName)) {
                continue;
            }
            return $argPosition;
        }
        return null;
    }
    private function resolveParentMethodParam(Scope $scope, string $methodName, int $paramPosition): ?Param
    {
        $classReflection = $scope->getClassReflection();
        if (!$classReflection instanceof ClassReflection) {
            return null;
        }
        foreach ($classReflection->getParents() as $parentClassReflection) {
            if (!$parentClassReflection->hasMethod($methodName)) {
                continue;
            }
            $parentClassMethod = $this->astResolver->resolveClassMethod($parentClassReflection->getName(), $methodName);
            if (!$parentClassMethod instanceof ClassMethod) {
                continue;
            }
            return $parentClassMethod->params[$paramPosition] ?? null;
        }
        return null;
    }
    private function isCallParamMixed(Node $node): bool
    {
        $callParamType = $this->staticTypeMapper->mapPhpParserNodePHPStanType($node);
        return $callParamType instanceof MixedType;
    }
}
