<?php
namespace Psalm\Internal\Analyzer\Statements\Expression\Call;

use PhpParser;
use Psalm\Internal\Analyzer\ClassLikeAnalyzer;
use Psalm\Internal\Analyzer\FunctionLikeAnalyzer;
use Psalm\Internal\Analyzer\MethodAnalyzer;
use Psalm\Internal\Analyzer\Statements\ExpressionAnalyzer;
use Psalm\Internal\Analyzer\StatementsAnalyzer;
use Psalm\Internal\Analyzer\TypeAnalyzer;
use Psalm\Internal\Codebase\CallMap;
use Psalm\Codebase;
use Psalm\CodeLocation;
use Psalm\Config;
use Psalm\Context;
use Psalm\Internal\FileManipulation\FileManipulationBuffer;
use Psalm\Issue\InvalidMethodCall;
use Psalm\Issue\InvalidPropertyAssignmentValue;
use Psalm\Issue\InvalidScope;
use Psalm\Issue\MixedMethodCall;
use Psalm\Issue\MixedTypeCoercion;
use Psalm\Issue\NullReference;
use Psalm\Issue\PossiblyFalseReference;
use Psalm\Issue\PossiblyInvalidMethodCall;
use Psalm\Issue\PossiblyInvalidPropertyAssignmentValue;
use Psalm\Issue\PossiblyNullReference;
use Psalm\Issue\PossiblyUndefinedMethod;
use Psalm\Issue\TypeCoercion;
use Psalm\Issue\UndefinedInterfaceMethod;
use Psalm\Issue\UndefinedMethod;
use Psalm\Issue\UndefinedThisPropertyAssignment;
use Psalm\Issue\UndefinedThisPropertyFetch;
use Psalm\IssueBuffer;
use Psalm\Storage\Assertion;
use Psalm\Storage\ClassLikeStorage;
use Psalm\Type;
use Psalm\Type\Atomic\TGenericObject;
use Psalm\Type\Atomic\TNamedObject;

/**
 * @internal
 */
class MethodCallAnalyzer extends \Psalm\Internal\Analyzer\Statements\Expression\CallAnalyzer
{
    /**
     * @param   StatementsAnalyzer               $statements_analyzer
     * @param   PhpParser\Node\Expr\MethodCall  $stmt
     * @param   Context                         $context
     *
     * @return  false|null
     */
    public static function analyze(
        StatementsAnalyzer $statements_analyzer,
        PhpParser\Node\Expr\MethodCall $stmt,
        Context $context
    ) {
        $stmt->inferredType = null;

        if (ExpressionAnalyzer::analyze($statements_analyzer, $stmt->var, $context) === false) {
            return false;
        }

        if (!$stmt->name instanceof PhpParser\Node\Identifier) {
            if (ExpressionAnalyzer::analyze($statements_analyzer, $stmt->name, $context) === false) {
                return false;
            }
        }

        if ($stmt->var instanceof PhpParser\Node\Expr\Variable) {
            if (is_string($stmt->var->name) && $stmt->var->name === 'this' && !$statements_analyzer->getFQCLN()) {
                if (IssueBuffer::accepts(
                    new InvalidScope(
                        'Use of $this in non-class context',
                        new CodeLocation($statements_analyzer->getSource(), $stmt)
                    ),
                    $statements_analyzer->getSuppressedIssues()
                )) {
                    return false;
                }
            }
        }

        $lhs_var_id = ExpressionAnalyzer::getArrayVarId(
            $stmt->var,
            $statements_analyzer->getFQCLN(),
            $statements_analyzer
        );

        $class_type = $lhs_var_id && $context->hasVariable($lhs_var_id, $statements_analyzer)
            ? $context->vars_in_scope[$lhs_var_id]
            : null;

        if (isset($stmt->var->inferredType)) {
            $class_type = $stmt->var->inferredType;
        } elseif (!$class_type) {
            $stmt->inferredType = Type::getMixed();
        }

        if (!$context->check_classes) {
            if (self::checkFunctionArguments(
                $statements_analyzer,
                $stmt->args,
                null,
                null,
                $context
            ) === false) {
                return false;
            }

            return null;
        }

        $has_mock = false;

        if ($class_type && $stmt->name instanceof PhpParser\Node\Identifier && $class_type->isNull()) {
            if (IssueBuffer::accepts(
                new NullReference(
                    'Cannot call method ' . $stmt->name->name . ' on null value',
                    new CodeLocation($statements_analyzer->getSource(), $stmt->name)
                ),
                $statements_analyzer->getSuppressedIssues()
            )) {
                return false;
            }

            return null;
        }

        if ($class_type
            && $stmt->name instanceof PhpParser\Node\Identifier
            && $class_type->isNullable()
            && !$class_type->ignore_nullable_issues
        ) {
            if (IssueBuffer::accepts(
                new PossiblyNullReference(
                    'Cannot call method ' . $stmt->name->name . ' on possibly null value',
                    new CodeLocation($statements_analyzer->getSource(), $stmt->name)
                ),
                $statements_analyzer->getSuppressedIssues()
            )) {
                // fall through
            }
        }

        if ($class_type
            && $stmt->name instanceof PhpParser\Node\Identifier
            && $class_type->isFalsable()
            && !$class_type->ignore_falsable_issues
        ) {
            if (IssueBuffer::accepts(
                new PossiblyFalseReference(
                    'Cannot call method ' . $stmt->name->name . ' on possibly false value',
                    new CodeLocation($statements_analyzer->getSource(), $stmt->name)
                ),
                $statements_analyzer->getSuppressedIssues()
            )) {
                // fall through
            }
        }

        $codebase = $statements_analyzer->getCodebase();
        $config = $codebase->config;

        $non_existent_class_method_ids = [];
        $non_existent_interface_method_ids = [];
        $existent_method_ids = [];
        $has_mixed_method_call = false;

        $invalid_method_call_types = [];
        $has_valid_method_call_type = false;

        $source = $statements_analyzer->getSource();

        $returns_by_ref = false;

        $no_method_id = false;

        if ($class_type) {
            $return_type = null;

            $lhs_types = $class_type->getTypes();

            foreach ($lhs_types as $lhs_type_part) {
                $result = self::analyzeAtomicCall(
                    $statements_analyzer,
                    $stmt,
                    $codebase,
                    $context,
                    $lhs_type_part,
                    $lhs_var_id,
                    $return_type,
                    $returns_by_ref,
                    $has_mock,
                    $has_valid_method_call_type,
                    $has_mixed_method_call,
                    $invalid_method_call_types,
                    $existent_method_ids,
                    $non_existent_class_method_ids,
                    $non_existent_interface_method_ids
                );

                if ($result === false) {
                    return false;
                }

                if ($result === true) {
                    $no_method_id = true;
                }
            }

            if ($invalid_method_call_types) {
                $invalid_class_type = $invalid_method_call_types[0];

                if ($has_valid_method_call_type || $has_mixed_method_call) {
                    if (IssueBuffer::accepts(
                        new PossiblyInvalidMethodCall(
                            'Cannot call method on possible ' . $invalid_class_type . ' variable ' . $lhs_var_id,
                            new CodeLocation($source, $stmt->name)
                        ),
                        $statements_analyzer->getSuppressedIssues()
                    )) {
                        return false;
                    }
                } else {
                    if (IssueBuffer::accepts(
                        new InvalidMethodCall(
                            'Cannot call method on ' . $invalid_class_type . ' variable ' . $lhs_var_id,
                            new CodeLocation($source, $stmt->name)
                        ),
                        $statements_analyzer->getSuppressedIssues()
                    )) {
                        return false;
                    }
                }
            }

            if ($non_existent_class_method_ids) {
                if ($context->check_methods) {
                    if ($existent_method_ids || $has_mixed_method_call) {
                        if (IssueBuffer::accepts(
                            new PossiblyUndefinedMethod(
                                'Method ' . $non_existent_class_method_ids[0] . ' does not exist',
                                new CodeLocation($source, $stmt->name),
                                $non_existent_class_method_ids[0]
                            ),
                            $statements_analyzer->getSuppressedIssues()
                        )) {
                            return false;
                        }
                    } else {
                        if (IssueBuffer::accepts(
                            new UndefinedMethod(
                                'Method ' . $non_existent_class_method_ids[0] . ' does not exist',
                                new CodeLocation($source, $stmt->name),
                                $non_existent_class_method_ids[0]
                            ),
                            $statements_analyzer->getSuppressedIssues()
                        )) {
                            return false;
                        }
                    }
                }

                return null;
            }

            if ($non_existent_interface_method_ids) {
                if ($context->check_methods) {
                    if ($existent_method_ids || $has_mixed_method_call) {
                        if (IssueBuffer::accepts(
                            new PossiblyUndefinedMethod(
                                'Method ' . $non_existent_interface_method_ids[0] . ' does not exist',
                                new CodeLocation($source, $stmt->name),
                                $non_existent_interface_method_ids[0]
                            ),
                            $statements_analyzer->getSuppressedIssues()
                        )) {
                            return false;
                        }
                    } else {
                        if (IssueBuffer::accepts(
                            new UndefinedInterfaceMethod(
                                'Method ' . $non_existent_interface_method_ids[0] . ' does not exist',
                                new CodeLocation($source, $stmt->name),
                                $non_existent_interface_method_ids[0]
                            ),
                            $statements_analyzer->getSuppressedIssues()
                        )) {
                            return false;
                        }
                    }
                }

                return null;
            }

            $stmt->inferredType = $return_type;

            if ($returns_by_ref) {
                if (!$stmt->inferredType) {
                    $stmt->inferredType = Type::getMixed();
                }

                $stmt->inferredType->by_ref = $returns_by_ref;
            }
        }

        if ($no_method_id) {
            return self::checkMethodArgs(
                null,
                $stmt->args,
                $found_generic_params,
                $context,
                new CodeLocation($statements_analyzer->getSource(), $stmt),
                $statements_analyzer
            );
        }

        if ($codebase->server_mode
            && (!$context->collect_initializations
                && !$context->collect_mutations)
            && isset($stmt->inferredType)
        ) {
            $codebase->analyzer->addNodeType(
                $statements_analyzer->getFilePath(),
                $stmt->name,
                (string) $stmt->inferredType
            );
        }

        if (!$config->remember_property_assignments_after_call && !$context->collect_initializations) {
            $context->removeAllObjectVars();
        }

        // if we called a method on this nullable variable, remove the nullable status here
        // because any further calls must have worked
        if ($lhs_var_id
            && $class_type
            && $has_valid_method_call_type
            && !$has_mixed_method_call
            && !$invalid_method_call_types
            && $existent_method_ids
            && ($class_type->from_docblock || $class_type->isNullable())
        ) {
            $keys_to_remove = [];

            foreach ($class_type->getTypes() as $key => $type) {
                if (!$type instanceof TNamedObject) {
                    $keys_to_remove[] = $key;
                } else {
                    $type->from_docblock = false;
                }
            }

            foreach ($keys_to_remove as $key) {
                $class_type->removeType($key);
            }

            $class_type->from_docblock = false;

            $context->removeVarFromConflictingClauses($lhs_var_id, null, $statements_analyzer);

            $context->vars_in_scope[$lhs_var_id] = $class_type;
        }
    }

    /**
     * [analyzeAtomicCall description]
     * @param  StatementsAnalyzer             $statements_analyzer
     * @param  PhpParser\Node\Expr\MethodCall $stmt
     * @param  Codebase                       $codebase
     * @param  Context                        $context
     * @param  Type\Atomic                    $lhs_type_part
     * @param  ?string                        $lhs_var_id
     * @param  ?Type\Union                    &$return_type
     * @param  bool                           &$returns_by_ref
     * @param  bool                           &$has_mock
     * @param  bool                           &$has_valid_method_call_type
     * @param  bool                           &$has_mixed_method_call
     * @param  array<string>                  &$invalid_method_call_types
     * @param  array<string>                  &$existent_method_ids
     * @param  array<string>                  &$non_existent_class_method_ids
     * @param  array<string>                  &$non_existent_interface_method_ids
     * @return null|bool
     */
    private static function analyzeAtomicCall(
        StatementsAnalyzer $statements_analyzer,
        PhpParser\Node\Expr\MethodCall $stmt,
        Codebase $codebase,
        Context $context,
        Type\Atomic $lhs_type_part,
        $lhs_var_id,
        &$return_type,
        &$returns_by_ref,
        &$has_mock,
        &$has_valid_method_call_type,
        &$has_mixed_method_call,
        &$invalid_method_call_types,
        &$existent_method_ids,
        &$non_existent_class_method_ids,
        &$non_existent_interface_method_ids
    ) {
        $config = $codebase->config;

        if ($lhs_type_part instanceof Type\Atomic\TGenericParam
            && !$lhs_type_part->as->isMixed()
        ) {
            $extra_types = $lhs_type_part->extra_types;

            $lhs_type_part = array_values(
                $lhs_type_part->as->getTypes()
            )[0];

            $lhs_type_part->from_docblock = true;

            if ($lhs_type_part instanceof TNamedObject) {
                $lhs_type_part->extra_types = $extra_types;
            }

            $has_mixed_method_call = true;
        }

        $source = $statements_analyzer->getSource();

        if (!$lhs_type_part instanceof TNamedObject) {
            switch (get_class($lhs_type_part)) {
                case Type\Atomic\TNull::class:
                case Type\Atomic\TFalse::class:
                    // handled above
                    return;

                case Type\Atomic\TInt::class:
                case Type\Atomic\TLiteralInt::class:
                case Type\Atomic\TFloat::class:
                case Type\Atomic\TLiteralFloat::class:
                case Type\Atomic\TBool::class:
                case Type\Atomic\TTrue::class:
                case Type\Atomic\TArray::class:
                case Type\Atomic\TNonEmptyArray::class:
                case Type\Atomic\ObjectLike::class:
                case Type\Atomic\TString::class:
                case Type\Atomic\TSingleLetter::class:
                case Type\Atomic\TLiteralString::class:
                case Type\Atomic\TLiteralClassString::class:
                case Type\Atomic\TGenericParamClass::class:
                case Type\Atomic\TNumericString::class:
                case Type\Atomic\THtmlEscapedString::class:
                case Type\Atomic\TClassString::class:
                case Type\Atomic\TIterable::class:
                    $invalid_method_call_types[] = (string)$lhs_type_part;
                    return;

                case Type\Atomic\TGenericParam::class:
                case Type\Atomic\TEmptyMixed::class:
                case Type\Atomic\TMixed::class:
                case Type\Atomic\TNonEmptyMixed::class:
                case Type\Atomic\TObject::class:
                case Type\Atomic\TObjectWithProperties::class:
                    $codebase->analyzer->incrementMixedCount($statements_analyzer->getFilePath());

                    $has_mixed_method_call = true;

                    if ($context->check_methods) {
                        if (IssueBuffer::accepts(
                            new MixedMethodCall(
                                'Cannot determine the type of the object on the left hand side of this expression',
                                new CodeLocation($source, $stmt->name)
                            ),
                            $statements_analyzer->getSuppressedIssues()
                        )) {
                            // fall through
                        }
                    }

                    if (self::checkFunctionArguments(
                        $statements_analyzer,
                        $stmt->args,
                        null,
                        null,
                        $context
                    ) === false) {
                        return false;
                    }

                    $return_type = Type::getMixed();
                    return;
            }

            return;
        }

        $codebase->analyzer->incrementNonMixedCount($statements_analyzer->getFilePath());

        $has_valid_method_call_type = true;

        $fq_class_name = $lhs_type_part->value;

        $intersection_types = $lhs_type_part->getIntersectionTypes();

        $is_mock = ExpressionAnalyzer::isMock($fq_class_name);

        $has_mock = $has_mock || $is_mock;

        if ($fq_class_name === 'static') {
            $fq_class_name = (string) $context->self;
        }

        if ($is_mock ||
            $context->isPhantomClass($fq_class_name)
        ) {
            $return_type = Type::getMixed();

            if (self::checkFunctionArguments(
                $statements_analyzer,
                $stmt->args,
                null,
                null,
                $context
            ) === false) {
                return false;
            }

            return;
        }

        if ($lhs_var_id === '$this') {
            $does_class_exist = true;
        } else {
            $does_class_exist = ClassLikeAnalyzer::checkFullyQualifiedClassLikeName(
                $statements_analyzer,
                $fq_class_name,
                new CodeLocation($source, $stmt->var),
                $statements_analyzer->getSuppressedIssues()
            );
        }

        if (!$does_class_exist) {
            return $does_class_exist;
        }

        if (!$stmt->name instanceof PhpParser\Node\Identifier) {
            $return_type = Type::getMixed();
            return true;
        }

        $method_name_lc = strtolower($stmt->name->name);

        $method_id = $fq_class_name . '::' . $method_name_lc;

        $intersection_method_id = $intersection_types
            ? '(' . $lhs_type_part . ')'  . '::' . $stmt->name->name
            : null;

        $args = $stmt->args;

        if (!$codebase->methods->methodExists($method_id)
            || !MethodAnalyzer::isMethodVisible(
                $method_id,
                $context->self,
                $statements_analyzer->getSource()
            )
        ) {
            if ($codebase->methods->methodExists($fq_class_name . '::__call', $context->calling_method_id)) {
                $class_storage = $codebase->classlike_storage_provider->get($fq_class_name);

                if (isset($class_storage->pseudo_methods[$method_name_lc])) {
                    $has_valid_method_call_type = true;
                    $existent_method_ids[] = $method_id;

                    $pseudo_method_storage = $class_storage->pseudo_methods[$method_name_lc];

                    if (self::checkFunctionArguments(
                        $statements_analyzer,
                        $args,
                        $pseudo_method_storage->params,
                        $method_id,
                        $context
                    ) === false) {
                        return false;
                    }

                    $generic_params = [];

                    if (self::checkFunctionLikeArgumentsMatch(
                        $statements_analyzer,
                        $args,
                        null,
                        $pseudo_method_storage->params,
                        $pseudo_method_storage,
                        null,
                        $generic_params,
                        new CodeLocation($source, $stmt),
                        $context
                    ) === false) {
                        return false;
                    }

                    if ($pseudo_method_storage->return_type) {
                        $return_type_candidate = clone $pseudo_method_storage->return_type;

                        if (!$return_type) {
                            $return_type = $return_type_candidate;
                        } else {
                            $return_type = Type::combineUnionTypes($return_type_candidate, $return_type);
                        }

                        return;
                    }
                } else {
                    if (self::checkFunctionArguments(
                        $statements_analyzer,
                        $args,
                        null,
                        null,
                        $context
                    ) === false) {
                        return false;
                    }

                    if ($class_storage->sealed_methods) {
                        $non_existent_class_method_ids[] = $method_id;
                        return true;
                    }
                }

                $has_valid_method_call_type = true;
                $existent_method_ids[] = $method_id;

                $array_values = array_map(
                    /**
                     * @return PhpParser\Node\Expr\ArrayItem
                     */
                    function (PhpParser\Node\Arg $arg) {
                        return new PhpParser\Node\Expr\ArrayItem($arg->value);
                    },
                    $args
                );

                $args = [
                    new PhpParser\Node\Arg(new PhpParser\Node\Scalar\String_($method_name_lc)),
                    new PhpParser\Node\Arg(new PhpParser\Node\Expr\Array_($array_values)),
                ];

                $method_id = $fq_class_name . '::__call';
            }
        }

        $source_source = $statements_analyzer->getSource();

        /**
         * @var \Psalm\Internal\Analyzer\ClassLikeAnalyzer|null
         */
        $classlike_source = $source_source->getSource();
        $classlike_source_fqcln = $classlike_source ? $classlike_source->getFQCLN() : null;

        if ($lhs_var_id === '$this'
            && $context->self
            && $classlike_source_fqcln
            && $fq_class_name !== $context->self
            && $codebase->methodExists($context->self . '::' . $method_name_lc)
        ) {
            $method_id = $context->self . '::' . $method_name_lc;
            $fq_class_name = $context->self;
        }

        $check_visibility = true;

        if ($intersection_types) {
            foreach ($intersection_types as $intersection_type) {
                if ($intersection_type instanceof TNamedObject
                    && $codebase->interfaceExists($intersection_type->value)
                ) {
                    $interface_storage = $codebase->classlike_storage_provider->get($intersection_type->value);

                    $check_visibility = $check_visibility && !$interface_storage->override_method_visibility;
                }
            }
        }

        $is_interface = false;

        if ($codebase->interfaceExists($fq_class_name)) {
            $is_interface = true;
        }

        if ($intersection_types && !$codebase->methodExists($method_id)) {
            if ($is_interface) {
                $interface_storage = $codebase->classlike_storage_provider->get($fq_class_name);

                $check_visibility = $check_visibility && !$interface_storage->override_method_visibility;
            }

            foreach ($intersection_types as $intersection_type) {
                if ($intersection_type instanceof Type\Atomic\TGenericParam) {
                    if (!$intersection_type->as->isMixed()
                        && !$intersection_type->as->hasObject()
                    ) {
                        $intersection_type = array_values(
                            $intersection_type->as->getTypes()
                        )[0];

                        if (!$intersection_type instanceof TNamedObject) {
                            throw new \UnexpectedValueException(
                                'Shouldn’t get a non-object generic param here'
                            );
                        }

                        $intersection_type->from_docblock = true;
                    } else {
                        continue;
                    }
                }

                $method_id = $intersection_type->value . '::' . $method_name_lc;
                $fq_class_name = $intersection_type->value;

                $does_class_exist = ClassLikeAnalyzer::checkFullyQualifiedClassLikeName(
                    $statements_analyzer,
                    $fq_class_name,
                    new CodeLocation($source, $stmt->var),
                    $statements_analyzer->getSuppressedIssues()
                );

                if (!$does_class_exist) {
                    return false;
                }

                if ($codebase->methodExists($method_id)) {
                    $is_interface = $codebase->interfaceExists($fq_class_name);

                    break;
                }
            }
        }

        $source_method_id = $source instanceof FunctionLikeAnalyzer
            ? $source->getMethodId()
            : null;

        if (!$codebase->methods->methodExists(
            $method_id,
            $context->calling_method_id,
            $method_id !== $source_method_id ? new CodeLocation($source, $stmt->name) : null
        )) {
            if ($config->use_phpdoc_method_without_magic_or_parent) {
                $class_storage = $codebase->classlike_storage_provider->get($fq_class_name);

                if (isset($class_storage->pseudo_methods[$method_name_lc])) {
                    $has_valid_method_call_type = true;
                    $existent_method_ids[] = $method_id;

                    $pseudo_method_storage = $class_storage->pseudo_methods[$method_name_lc];

                    if (self::checkFunctionArguments(
                        $statements_analyzer,
                        $args,
                        $pseudo_method_storage->params,
                        $method_id,
                        $context
                    ) === false) {
                        return false;
                    }

                    $generic_params = [];

                    if (self::checkFunctionLikeArgumentsMatch(
                        $statements_analyzer,
                        $args,
                        null,
                        $pseudo_method_storage->params,
                        $pseudo_method_storage,
                        null,
                        $generic_params,
                        new CodeLocation($source, $stmt->name),
                        $context
                    ) === false) {
                        return false;
                    }

                    if ($pseudo_method_storage->return_type) {
                        $return_type_candidate = clone $pseudo_method_storage->return_type;

                        if (!$return_type) {
                            $return_type = $return_type_candidate;
                        } else {
                            $return_type = Type::combineUnionTypes($return_type_candidate, $return_type);
                        }

                        return;
                    }

                    $return_type = Type::getMixed();

                    return;
                }
            }

            if ($is_interface) {
                $non_existent_interface_method_ids[] = $intersection_method_id ?: $method_id;
            } else {
                $non_existent_class_method_ids[] = $intersection_method_id ?: $method_id;
            }

            return true;
        }

        if ($context->collect_initializations && $context->calling_method_id) {
            list($calling_method_class) = explode('::', $context->calling_method_id);
            $codebase->file_reference_provider->addReferenceToClassMethod(
                $calling_method_class . '::__construct',
                strtolower($method_id)
            );
        }

        $existent_method_ids[] = $method_id;

        if ($stmt->var instanceof PhpParser\Node\Expr\Variable
            && ($context->collect_initializations || $context->collect_mutations)
            && $stmt->var->name === 'this'
            && $source instanceof FunctionLikeAnalyzer
        ) {
            self::collectSpecialInformation($source, $stmt->name->name, $context);
        }

        $fq_class_name = $codebase->classlikes->getUnAliasedName($fq_class_name);

        $class_storage = $codebase->methods->getClassLikeStorageForMethod($method_id);

        $class_template_params = self::getClassTemplateParams(
            $codebase,
            $class_storage,
            $fq_class_name,
            $method_name_lc,
            $lhs_type_part,
            $lhs_var_id
        );

        if (self::checkMethodArgs(
            $method_id,
            $args,
            $class_template_params,
            $context,
            new CodeLocation($source, $stmt->name),
            $statements_analyzer
        ) === false) {
            return false;
        }

        switch (strtolower($stmt->name->name)) {
            case '__tostring':
                $return_type = Type::getString();
                return;
        }

        $call_map_id = strtolower(
            $codebase->methods->getDeclaringMethodId($method_id) ?: $method_id
        );

        if ($method_name_lc === '__tostring') {
            $return_type_candidate = Type::getString();
        } elseif ($call_map_id && CallMap::inCallMap($call_map_id)) {
            if (($class_template_params || $class_storage->stubbed)
                && isset($class_storage->methods[$method_name_lc])
                && ($method_storage = $class_storage->methods[$method_name_lc])
                && $method_storage->return_type
            ) {
                $return_type_candidate = clone $method_storage->return_type;

                if ($class_template_params) {
                    $return_type_candidate->replaceTemplateTypesWithArgTypes(
                        $class_template_params,
                        $codebase
                    );
                }
            } else {
                if ($call_map_id === 'domnode::appendchild'
                    && isset($args[0]->value->inferredType)
                    && $args[0]->value->inferredType->hasObjectType()
                ) {
                    $return_type_candidate = clone $args[0]->value->inferredType;
                } elseif ($call_map_id === 'simplexmlelement::asxml' && !count($args)) {
                    $return_type_candidate = Type::parseString('string|false');
                } else {
                    $return_type_candidate = CallMap::getReturnTypeFromCallMap($call_map_id);
                    if ($return_type_candidate->isFalsable()) {
                        $return_type_candidate->ignore_falsable_issues = true;
                    }
                }
            }

            $return_type_candidate = ExpressionAnalyzer::fleshOutType(
                $codebase,
                $return_type_candidate,
                $fq_class_name,
                $lhs_type_part
            );
        } else {
            $name_code_location = new CodeLocation($source, $stmt->name);

            if ($check_visibility) {
                if (MethodAnalyzer::checkMethodVisibility(
                    $method_id,
                    $context->self,
                    $statements_analyzer->getSource(),
                    $name_code_location,
                    $statements_analyzer->getSuppressedIssues()
                ) === false) {
                    return false;
                }
            }

            if (MethodAnalyzer::checkMethodNotDeprecatedOrInternal(
                $codebase,
                $context,
                $method_id,
                $name_code_location,
                $statements_analyzer->getSuppressedIssues()
            ) === false) {
                return false;
            }

            if (!self::checkMagicGetterOrSetterProperty(
                $statements_analyzer,
                $stmt,
                $fq_class_name
            )) {
                return false;
            }

            $self_fq_class_name = $fq_class_name;

            $return_type_candidate = $codebase->methods->getMethodReturnType(
                $method_id,
                $self_fq_class_name,
                $args
            );

            if ($codebase->server_mode && $method_id) {
                $codebase->analyzer->addNodeReference(
                    $statements_analyzer->getFilePath(),
                    $stmt->name,
                    $method_id . '()'
                );
            }

            if (isset($stmt->inferredType)) {
                $return_type_candidate = $stmt->inferredType;
            }

            if ($return_type_candidate) {
                $return_type_candidate = clone $return_type_candidate;

                if ($class_template_params) {
                    $return_type_candidate->replaceTemplateTypesWithArgTypes(
                        $class_template_params,
                        $codebase
                    );
                }

                $return_type_candidate = ExpressionAnalyzer::fleshOutType(
                    $codebase,
                    $return_type_candidate,
                    $self_fq_class_name,
                    $lhs_type_part
                );

                $return_type_location = $codebase->methods->getMethodReturnTypeLocation(
                    $method_id,
                    $secondary_return_type_location
                );

                if ($secondary_return_type_location) {
                    $return_type_location = $secondary_return_type_location;
                }

                // only check the type locally if it's defined externally
                if ($return_type_location && !$config->isInProjectDirs($return_type_location->file_path)) {
                    $return_type_candidate->check(
                        $statements_analyzer,
                        new CodeLocation($source, $stmt),
                        $statements_analyzer->getSuppressedIssues(),
                        $context->phantom_classes
                    );
                }
            } else {
                $returns_by_ref =
                    $returns_by_ref
                        || $codebase->methods->getMethodReturnsByRef($method_id);
            }

            $method_storage = $codebase->methods->getUserMethodStorage($method_id);

            if ($method_storage) {
                if ($method_storage->assertions) {
                    self::applyAssertionsToContext(
                        $stmt->name,
                        $method_storage->assertions,
                        $args,
                        $class_template_params ?: [],
                        $context,
                        $statements_analyzer
                    );
                }

                if ($method_storage->if_true_assertions) {
                    $stmt->ifTrueAssertions = array_map(
                        function (Assertion $assertion) use ($class_template_params) : Assertion {
                            return $assertion->getUntemplatedCopy($class_template_params ?: []);
                        },
                        $method_storage->if_true_assertions
                    );
                }

                if ($method_storage->if_false_assertions) {
                    $stmt->ifFalseAssertions = array_map(
                        function (Assertion $assertion) use ($class_template_params) : Assertion {
                            return $assertion->getUntemplatedCopy($class_template_params ?: []);
                        },
                        $method_storage->if_false_assertions
                    );
                }
            }
        }

        if (!$args && $lhs_var_id) {
            if ($config->memoize_method_calls) {
                $method_var_id = $lhs_var_id . '->' . $method_name_lc . '()';

                if (isset($context->vars_in_scope[$method_var_id])) {
                    $return_type_candidate = clone $context->vars_in_scope[$method_var_id];
                } elseif ($return_type_candidate) {
                    $context->vars_in_scope[$method_var_id] = $return_type_candidate;
                }
            }
        }

        if ($config->after_method_checks) {
            $file_manipulations = [];

            $appearing_method_id = $codebase->methods->getAppearingMethodId($method_id);
            $declaring_method_id = $codebase->methods->getDeclaringMethodId($method_id);

            if ($appearing_method_id && $declaring_method_id) {
                foreach ($config->after_method_checks as $plugin_fq_class_name) {
                    $plugin_fq_class_name::afterMethodCallAnalysis(
                        $stmt,
                        $method_id,
                        $appearing_method_id,
                        $declaring_method_id,
                        $context,
                        $source,
                        $codebase,
                        $file_manipulations,
                        $return_type_candidate
                    );
                }
            }

            if ($file_manipulations) {
                /** @psalm-suppress MixedTypeCoercion */
                FileManipulationBuffer::add($statements_analyzer->getFilePath(), $file_manipulations);
            }
        }

        if ($return_type_candidate) {
            if (!$return_type) {
                $return_type = $return_type_candidate;
            } else {
                $return_type = Type::combineUnionTypes($return_type_candidate, $return_type);
            }
        } else {
            $return_type = Type::getMixed();
        }
    }

    /**
     * @return array<string, array{0:Type\Union, 1:string|null}>|null
     */
    public static function getClassTemplateParams(
        Codebase $codebase,
        ClassLikeStorage $class_storage,
        string $fq_class_name,
        string $method_name,
        Type\Atomic $lhs_type_part = null,
        string $lhs_var_id = null
    ) {
        $calling_class_storage = $codebase->classlike_storage_provider->get($fq_class_name);

        $template_types = $class_storage->template_types;

        if (!$template_types) {
            if ($calling_class_storage->template_type_extends
                && !empty($class_storage->overridden_method_ids[$method_name])
                && !isset($class_storage->methods[$method_name]->return_type)
            ) {
                foreach ($class_storage->overridden_method_ids[$method_name] as $overridden_method_id) {
                    $overridden_storage = $codebase->methods->getStorage($overridden_method_id);

                    if (!$overridden_storage->return_type) {
                        return null;
                    }

                    if ($overridden_storage->return_type->isNull()) {
                        return null;
                    }

                    list($fq_overridden_class) = explode('::', $overridden_method_id);

                    $overridden_class_storage = $codebase->classlike_storage_provider->get($fq_overridden_class);

                    $template_types = $overridden_class_storage->template_types;
                    $class_storage = $overridden_class_storage;
                }
            }

            if (!$template_types) {
                return null;
            }
        }

        $class_template_params = [];
        $e = $calling_class_storage->template_type_extends;

        if ($lhs_type_part instanceof TGenericObject) {
            if ($calling_class_storage->template_types) {
                $i = 0;
                foreach ($calling_class_storage->template_types as $type_name => $_) {
                    if (isset($lhs_type_part->type_params[$i])) {
                        $class_template_params[$type_name] = [
                            $lhs_type_part->type_params[$i],
                            $calling_class_storage->name,
                        ];
                    }

                    $i++;
                }
            }

            $i = 0;
            foreach ($template_types as $type_name => $_) {
                if (isset($class_template_params[$type_name])) {
                    $i++;
                    continue;
                }

                if ($class_storage !== $calling_class_storage
                    && isset($e[strtolower($class_storage->name)][$type_name])
                ) {
                    $type_extends = $e[strtolower($class_storage->name)][$type_name];

                    if ($type_extends instanceof Type\Atomic\TGenericParam) {
                        if (isset($calling_class_storage->template_types[$type_extends->param_name])) {
                            $mapped_offset = array_search(
                                $type_extends->param_name,
                                array_keys($calling_class_storage->template_types)
                            );
                            $class_template_params[$type_name] = [
                                $lhs_type_part->type_params[(int) $mapped_offset],
                                $class_storage->name,
                            ];
                        } elseif ($type_extends->defining_class
                            && isset(
                                $calling_class_storage
                                    ->template_type_extends
                                        [strtolower($type_extends->defining_class)]
                                        [$type_extends->param_name]
                            )
                        ) {
                            $mapped_offset = array_search(
                                $type_extends->param_name,
                                array_keys($calling_class_storage
                                ->template_type_extends
                                    [strtolower($type_extends->defining_class)])
                            );

                            $class_template_params[$type_name] = [
                                $lhs_type_part->type_params[(int) $mapped_offset],
                                $class_storage->name,
                            ];
                        }
                    } else {
                        $class_template_params[$type_name] = [
                            new Type\Union([$type_extends]),
                            $class_storage->name,
                        ];
                    }
                }

                if (!isset($class_template_params[$type_name])) {
                    $class_template_params[$type_name] = [Type::getMixed(), null];
                }

                $i++;
            }
        } else {
            foreach ($template_types as $type_name => list($type)) {
                if ($class_storage !== $calling_class_storage
                    && isset($e[strtolower($class_storage->name)][$type_name])
                ) {
                    $type_extends = $e[strtolower($class_storage->name)][$type_name];

                    if (!$type_extends instanceof Type\Atomic\TGenericParam) {
                        $class_template_params[$type_name] = [
                            new Type\Union([$type_extends]),
                            $class_storage->name,
                        ];
                    }
                }

                if ($lhs_var_id !== '$this') {
                    if (!isset($class_template_params[$type_name])) {
                        $class_template_params[$type_name] = [$type, $class_storage->name];
                    }
                }
            }
        }

        return $class_template_params;
    }

    /**
     * Check properties accessed with magic getters and setters.
     * If `@psalm-seal-properties` is set, they must be defined.
     * If an `@property` annotation is specified, the setter must set something with the correct
     * type.
     *
     * @param StatementsAnalyzer $statements_analyzer
     * @param PhpParser\Node\Expr\MethodCall $stmt
     * @param string $fq_class_name
     *
     * @return bool
     */
    private static function checkMagicGetterOrSetterProperty(
        StatementsAnalyzer $statements_analyzer,
        PhpParser\Node\Expr\MethodCall $stmt,
        $fq_class_name
    ) {
        if (!$stmt->name instanceof PhpParser\Node\Identifier) {
            return true;
        }

        $method_name = strtolower($stmt->name->name);
        if (!in_array($method_name, ['__get', '__set'], true)) {
            return true;
        }

        $first_arg_value = $stmt->args[0]->value;
        if (!$first_arg_value instanceof PhpParser\Node\Scalar\String_) {
            return true;
        }

        $prop_name = $first_arg_value->value;
        $property_id = $fq_class_name . '::$' . $prop_name;
        $codebase = $statements_analyzer->getCodebase();
        $class_storage = $codebase->classlike_storage_provider->get($fq_class_name);

        switch ($method_name) {
            case '__set':
                // If `@psalm-seal-properties` is set, the property must be defined with
                // a `@property` annotation
                if ($class_storage->sealed_properties
                    && !isset($class_storage->pseudo_property_set_types['$' . $prop_name])
                    && IssueBuffer::accepts(
                        new UndefinedThisPropertyAssignment(
                            'Instance property ' . $property_id . ' is not defined',
                            new CodeLocation($statements_analyzer->getSource(), $stmt),
                            $property_id
                        ),
                        $statements_analyzer->getSuppressedIssues()
                    )
                ) {
                    return false;
                }

                // If a `@property` annotation is set, the type of the value passed to the
                // magic setter must match the annotation.
                $second_arg_type = isset($stmt->args[1]->value->inferredType)
                    ? $stmt->args[1]->value->inferredType
                    : null;

                if (isset($class_storage->pseudo_property_set_types['$' . $prop_name]) && $second_arg_type) {
                    $pseudo_set_type = ExpressionAnalyzer::fleshOutType(
                        $codebase,
                        $class_storage->pseudo_property_set_types['$' . $prop_name],
                        $fq_class_name,
                        new Type\Atomic\TNamedObject($fq_class_name)
                    );

                    $type_match_found = TypeAnalyzer::isContainedBy(
                        $codebase,
                        $second_arg_type,
                        $pseudo_set_type,
                        $second_arg_type->ignore_nullable_issues,
                        $second_arg_type->ignore_falsable_issues,
                        $has_scalar_match,
                        $type_coerced,
                        $type_coerced_from_mixed,
                        $to_string_cast
                    );

                    if ($type_coerced) {
                        if ($type_coerced_from_mixed) {
                            if (IssueBuffer::accepts(
                                new MixedTypeCoercion(
                                    $prop_name . ' expects \'' . $pseudo_set_type . '\', '
                                        . ' parent type `' . $second_arg_type . '` provided',
                                    new CodeLocation($statements_analyzer->getSource(), $stmt)
                                ),
                                $statements_analyzer->getSuppressedIssues()
                            )) {
                                // keep soldiering on
                            }
                        } else {
                            if (IssueBuffer::accepts(
                                new TypeCoercion(
                                    $prop_name . ' expects \'' . $pseudo_set_type . '\', '
                                        . ' parent type `' . $second_arg_type . '` provided',
                                    new CodeLocation($statements_analyzer->getSource(), $stmt)
                                ),
                                $statements_analyzer->getSuppressedIssues()
                            )) {
                                // keep soldiering on
                            }
                        }
                    }

                    if (!$type_match_found && !$type_coerced_from_mixed) {
                        if (TypeAnalyzer::canBeContainedBy(
                            $codebase,
                            $second_arg_type,
                            $pseudo_set_type
                        )) {
                            if (IssueBuffer::accepts(
                                new PossiblyInvalidPropertyAssignmentValue(
                                    $prop_name . ' with declared type \''
                                    . $pseudo_set_type
                                    . '\' cannot be assigned possibly different type \'' . $second_arg_type . '\'',
                                    new CodeLocation($statements_analyzer->getSource(), $stmt),
                                    $property_id
                                ),
                                $statements_analyzer->getSuppressedIssues()
                            )) {
                                return false;
                            }
                        } else {
                            if (IssueBuffer::accepts(
                                new InvalidPropertyAssignmentValue(
                                    $prop_name . ' with declared type \''
                                    . $pseudo_set_type
                                    . '\' cannot be assigned type \'' . $second_arg_type . '\'',
                                    new CodeLocation($statements_analyzer->getSource(), $stmt),
                                    $property_id
                                ),
                                $statements_analyzer->getSuppressedIssues()
                            )) {
                                return false;
                            }
                        }
                    }
                }
                break;

            case '__get':
                // If `@psalm-seal-properties` is set, the property must be defined with
                // a `@property` annotation
                if ($class_storage->sealed_properties
                    && !isset($class_storage->pseudo_property_get_types['$' . $prop_name])
                    && IssueBuffer::accepts(
                        new UndefinedThisPropertyFetch(
                            'Instance property ' . $property_id . ' is not defined',
                            new CodeLocation($statements_analyzer->getSource(), $stmt),
                            $property_id
                        ),
                        $statements_analyzer->getSuppressedIssues()
                    )
                ) {
                    return false;
                }

                if (isset($class_storage->pseudo_property_get_types['$' . $prop_name])) {
                    $stmt->inferredType = clone $class_storage->pseudo_property_get_types['$' . $prop_name];
                }

                break;
        }

        return true;
    }
}