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

use PhpParser;
use Psalm\Internal\Analyzer\ClassLikeAnalyzer;
use Psalm\Internal\Analyzer\FunctionLikeAnalyzer;
use Psalm\Internal\Analyzer\StatementsAnalyzer;
use Psalm\Internal\Type\Comparator\UnionTypeComparator;
use Psalm\Internal\Type\TemplateResult;
use Psalm\CodeLocation;
use Psalm\Context;
use Psalm\Issue\InvalidArgument;
use Psalm\Issue\InvalidScalarArgument;
use Psalm\Issue\MixedArgumentTypeCoercion;
use Psalm\Issue\ArgumentTypeCoercion;
use Psalm\Issue\UndefinedFunction;
use Psalm\IssueBuffer;
use Psalm\Storage\ClassLikeStorage;
use Psalm\Type;
use Psalm\Type\Atomic\TNamedObject;
use function strtolower;
use function strpos;
use function count;
use function in_array;
use function is_null;
use function is_string;
use function preg_match;
use function preg_replace;
use function str_replace;
use function is_int;
use function substr;
use function array_merge;

/**
 * @internal
 */
class CallAnalyzer
{
    /**
     * @param   FunctionLikeAnalyzer $source
     * @param   string              $method_name
     * @param   Context             $context
     *
     * @return  void
     */
    public static function collectSpecialInformation(
        FunctionLikeAnalyzer $source,
        string $method_name,
        Context $context
    ) {
        $fq_class_name = (string)$source->getFQCLN();

        $project_analyzer = $source->getFileAnalyzer()->project_analyzer;
        $codebase = $source->getCodebase();

        if ($context->collect_mutations &&
            $context->self &&
            (
                $context->self === $fq_class_name ||
                $codebase->classExtends(
                    $context->self,
                    $fq_class_name
                )
            )
        ) {
            $method_id = new \Psalm\Internal\MethodIdentifier(
                $fq_class_name,
                strtolower($method_name)
            );

            if ((string) $method_id !== $source->getId()) {
                if ($context->collect_initializations) {
                    if (isset($context->initialized_methods[(string) $method_id])) {
                        return;
                    }

                    if ($context->initialized_methods === null) {
                        $context->initialized_methods = [];
                    }

                    $context->initialized_methods[(string) $method_id] = true;
                }

                $project_analyzer->getMethodMutations(
                    $method_id,
                    $context,
                    $source->getRootFilePath(),
                    $source->getRootFileName()
                );
            }
        } elseif ($context->collect_initializations &&
            $context->self &&
            (
                $context->self === $fq_class_name
                || $codebase->classlikes->classExtends(
                    $context->self,
                    $fq_class_name
                )
            ) &&
            $source->getMethodName() !== $method_name
        ) {
            $method_id = new \Psalm\Internal\MethodIdentifier($fq_class_name, strtolower($method_name));

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

            if (isset($context->vars_in_scope['$this'])) {
                foreach ($context->vars_in_scope['$this']->getAtomicTypes() as $atomic_type) {
                    if ($atomic_type instanceof TNamedObject) {
                        if ($fq_class_name === $atomic_type->value) {
                            $alt_declaring_method_id = $declaring_method_id;
                        } else {
                            $fq_class_name = $atomic_type->value;

                            $method_id = new \Psalm\Internal\MethodIdentifier(
                                $fq_class_name,
                                strtolower($method_name)
                            );

                            $alt_declaring_method_id = $codebase->methods->getDeclaringMethodId($method_id);
                        }

                        if ($alt_declaring_method_id) {
                            $declaring_method_id = $alt_declaring_method_id;
                            break;
                        }

                        if (!$atomic_type->extra_types) {
                            continue;
                        }

                        foreach ($atomic_type->extra_types as $intersection_type) {
                            if ($intersection_type instanceof TNamedObject) {
                                $fq_class_name = $intersection_type->value;
                                $method_id = new \Psalm\Internal\MethodIdentifier(
                                    $fq_class_name,
                                    strtolower($method_name)
                                );

                                $alt_declaring_method_id = $codebase->methods->getDeclaringMethodId($method_id);

                                if ($alt_declaring_method_id) {
                                    $declaring_method_id = $alt_declaring_method_id;
                                    break 2;
                                }
                            }
                        }
                    }
                }
            }

            if (!$declaring_method_id) {
                // can happen for __call
                return;
            }

            if (isset($context->initialized_methods[(string) $declaring_method_id])) {
                return;
            }

            if ($context->initialized_methods === null) {
                $context->initialized_methods = [];
            }

            $context->initialized_methods[(string) $declaring_method_id] = true;

            $method_storage = $codebase->methods->getStorage($declaring_method_id);

            $class_analyzer = $source->getSource();

            $is_final = $method_storage->final;

            if ($method_name !== $declaring_method_id->method_name) {
                $appearing_method_id = $codebase->methods->getAppearingMethodId($method_id);

                if ($appearing_method_id) {
                    $appearing_class_storage = $codebase->classlike_storage_provider->get(
                        $appearing_method_id->fq_class_name
                    );

                    if (isset($appearing_class_storage->trait_final_map[strtolower($method_name)])) {
                        $is_final = true;
                    }
                }
            }

            if ($class_analyzer instanceof ClassLikeAnalyzer
                && !$method_storage->is_static
                && ($context->collect_nonprivate_initializations
                    || $method_storage->visibility === ClassLikeAnalyzer::VISIBILITY_PRIVATE
                    || $is_final)
            ) {
                $local_vars_in_scope = [];
                $local_vars_possibly_in_scope = [];

                foreach ($context->vars_in_scope as $var => $_) {
                    if (strpos($var, '$this->') !== 0 && $var !== '$this') {
                        $local_vars_in_scope[$var] = $context->vars_in_scope[$var];
                    }
                }

                foreach ($context->vars_possibly_in_scope as $var => $_) {
                    if (strpos($var, '$this->') !== 0 && $var !== '$this') {
                        $local_vars_possibly_in_scope[$var] = $context->vars_possibly_in_scope[$var];
                    }
                }

                $old_calling_method_id = $context->calling_method_id;

                if ($fq_class_name === $source->getFQCLN()) {
                    $class_analyzer->getMethodMutations($declaring_method_id->method_name, $context);
                } else {
                    $declaring_fq_class_name = $declaring_method_id->fq_class_name;

                    $old_self = $context->self;
                    $context->self = $declaring_fq_class_name;
                    $project_analyzer->getMethodMutations(
                        $declaring_method_id,
                        $context,
                        $source->getRootFilePath(),
                        $source->getRootFileName()
                    );
                    $context->self = $old_self;
                }

                $context->calling_method_id = $old_calling_method_id;

                foreach ($local_vars_in_scope as $var => $type) {
                    $context->vars_in_scope[$var] = $type;
                }

                foreach ($local_vars_possibly_in_scope as $var => $_) {
                    $context->vars_possibly_in_scope[$var] = true;
                }
            }
        }
    }

    /**
     * @param  array<int, PhpParser\Node\Arg>   $args
     * @param  Context                          $context
     * @param  CodeLocation                     $code_location
     * @param  StatementsAnalyzer               $statements_analyzer
     */
    public static function checkMethodArgs(
        ?\Psalm\Internal\MethodIdentifier $method_id,
        array $args,
        ?TemplateResult $class_template_result,
        Context $context,
        CodeLocation $code_location,
        StatementsAnalyzer $statements_analyzer
    ) : bool {
        $codebase = $statements_analyzer->getCodebase();

        $method_params = $method_id
            ? $codebase->methods->getMethodParams($method_id, $statements_analyzer, $args, $context)
            : null;

        if (Call\ArgumentsAnalyzer::analyze(
            $statements_analyzer,
            $args,
            $method_params,
            (string) $method_id,
            $context,
            $class_template_result
        ) === false) {
            return false;
        }

        if (!$method_id || $method_params === null) {
            return true;
        }

        $fq_class_name = $method_id->fq_class_name;
        $method_name = $method_id->method_name;

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

        $class_storage = $codebase->classlike_storage_provider->get($fq_class_name);

        $method_storage = null;

        if (isset($class_storage->declaring_method_ids[$method_name])) {
            $declaring_method_id = $class_storage->declaring_method_ids[$method_name];

            $declaring_fq_class_name = $declaring_method_id->fq_class_name;
            $declaring_method_name = $declaring_method_id->method_name;

            if ($declaring_fq_class_name !== $fq_class_name) {
                $declaring_class_storage = $codebase->classlike_storage_provider->get($declaring_fq_class_name);
            } else {
                $declaring_class_storage = $class_storage;
            }

            if (!isset($declaring_class_storage->methods[$declaring_method_name])) {
                throw new \UnexpectedValueException('Storage should not be empty here');
            }

            $method_storage = $declaring_class_storage->methods[$declaring_method_name];

            if ($declaring_class_storage->user_defined
                && !$method_storage->has_docblock_param_types
                && isset($declaring_class_storage->documenting_method_ids[$method_name])
            ) {
                $documenting_method_id = $declaring_class_storage->documenting_method_ids[$method_name];

                $documenting_method_storage = $codebase->methods->getStorage($documenting_method_id);

                if ($documenting_method_storage->template_types) {
                    $method_storage = $documenting_method_storage;
                }
            }

            if (!$context->isSuppressingExceptions($statements_analyzer)) {
                $context->mergeFunctionExceptions($method_storage, $code_location);
            }
        }

        if (Call\ArgumentsAnalyzer::checkArgumentsMatch(
            $statements_analyzer,
            $args,
            $method_id,
            $method_params,
            $method_storage,
            $class_storage,
            $class_template_result,
            $code_location,
            $context
        ) === false) {
            return false;
        }

        if ($class_template_result) {
            self::checkTemplateResult(
                $statements_analyzer,
                $class_template_result,
                $code_location,
                strtolower((string) $method_id)
            );
        }

        return true;
    }

    /**
     * @return array<string, array<string, array{Type\Union}>>
     * @param array<string, non-empty-array<string, array{Type\Union}>> $existing_template_types
     */
    public static function getTemplateTypesForCall(
        \Psalm\Codebase $codebase,
        ?ClassLikeStorage $declaring_class_storage,
        ?string $appearing_class_name,
        ?ClassLikeStorage $calling_class_storage,
        array $existing_template_types = []
    ) : array {
        $template_types = $existing_template_types;

        if ($declaring_class_storage) {
            if ($calling_class_storage
                && $declaring_class_storage !== $calling_class_storage
                && $calling_class_storage->template_type_extends
            ) {
                foreach ($calling_class_storage->template_type_extends as $class_name => $type_map) {
                    foreach ($type_map as $template_name => $type) {
                        if (is_string($template_name) && $class_name === $declaring_class_storage->name) {
                            $output_type = null;

                            foreach ($type->getAtomicTypes() as $atomic_type) {
                                if ($atomic_type instanceof Type\Atomic\TTemplateParam
                                    && isset(
                                        $calling_class_storage
                                            ->template_type_extends
                                                [$atomic_type->defining_class]
                                                [$atomic_type->param_name]
                                    )
                                ) {
                                    $output_type_candidate = $calling_class_storage
                                        ->template_type_extends
                                            [$atomic_type->defining_class]
                                            [$atomic_type->param_name];
                                } elseif ($atomic_type instanceof Type\Atomic\TTemplateParam) {
                                    $output_type_candidate = $atomic_type->as;
                                } else {
                                    $output_type_candidate = new Type\Union([$atomic_type]);
                                }

                                if (!$output_type) {
                                    $output_type = $output_type_candidate;
                                } else {
                                    $output_type = Type::combineUnionTypes(
                                        $output_type_candidate,
                                        $output_type
                                    );
                                }
                            }

                            $template_types[$template_name][$declaring_class_storage->name] = [$output_type];
                        }
                    }
                }
            } elseif ($declaring_class_storage->template_types) {
                foreach ($declaring_class_storage->template_types as $template_name => $type_map) {
                    foreach ($type_map as $key => list($type)) {
                        $template_types[$template_name][$key] = [$type];
                    }
                }
            }
        }

        foreach ($template_types as $key => $type_map) {
            foreach ($type_map as $class => $type) {
                $template_types[$key][$class][0] = \Psalm\Internal\Type\TypeExpander::expandUnion(
                    $codebase,
                    $type[0],
                    $appearing_class_name,
                    $calling_class_storage ? $calling_class_storage->name : null,
                    null,
                    true,
                    false,
                    $calling_class_storage ? $calling_class_storage->final : false
                );
            }
        }

        return $template_types;
    }

    /**
     * @param  PhpParser\Node\Scalar\String_|PhpParser\Node\Expr\Array_|PhpParser\Node\Expr\BinaryOp\Concat
     *         $callable_arg
     *
     * @return non-empty-string[]
     *
     * @psalm-suppress LessSpecificReturnStatement
     * @psalm-suppress MoreSpecificReturnType
     */
    public static function getFunctionIdsFromCallableArg(
        \Psalm\FileSource $file_source,
        $callable_arg
    ) {
        if ($callable_arg instanceof PhpParser\Node\Expr\BinaryOp\Concat) {
            if ($callable_arg->left instanceof PhpParser\Node\Expr\ClassConstFetch
                && $callable_arg->left->class instanceof PhpParser\Node\Name
                && $callable_arg->left->name instanceof PhpParser\Node\Identifier
                && strtolower($callable_arg->left->name->name) === 'class'
                && !in_array(strtolower($callable_arg->left->class->parts[0]), ['self', 'static', 'parent'])
                && $callable_arg->right instanceof PhpParser\Node\Scalar\String_
                && preg_match('/^::[A-Za-z0-9]+$/', $callable_arg->right->value)
            ) {
                return [
                    (string) $callable_arg->left->class->getAttribute('resolvedName') . $callable_arg->right->value
                ];
            }

            return [];
        }

        if ($callable_arg instanceof PhpParser\Node\Scalar\String_) {
            $potential_id = preg_replace('/^\\\/', '', $callable_arg->value);

            if (preg_match('/^[A-Za-z0-9_]+(\\\[A-Za-z0-9_]+)*(::[A-Za-z0-9_]+)?$/', $potential_id)) {
                return [$potential_id];
            }

            return [];
        }

        if (count($callable_arg->items) !== 2) {
            return [];
        }

        /** @psalm-suppress PossiblyNullPropertyFetch */
        if ($callable_arg->items[0]->key || $callable_arg->items[1]->key) {
            return [];
        }

        if (!isset($callable_arg->items[0]) || !isset($callable_arg->items[1])) {
            throw new \UnexpectedValueException('These should never be unset');
        }

        $class_arg = $callable_arg->items[0]->value;
        $method_name_arg = $callable_arg->items[1]->value;

        if (!$method_name_arg instanceof PhpParser\Node\Scalar\String_) {
            return [];
        }

        if ($class_arg instanceof PhpParser\Node\Scalar\String_) {
            return [preg_replace('/^\\\/', '', $class_arg->value) . '::' . $method_name_arg->value];
        }

        if ($class_arg instanceof PhpParser\Node\Expr\ClassConstFetch
            && $class_arg->name instanceof PhpParser\Node\Identifier
            && strtolower($class_arg->name->name) === 'class'
            && $class_arg->class instanceof PhpParser\Node\Name
        ) {
            $fq_class_name = ClassLikeAnalyzer::getFQCLNFromNameObject(
                $class_arg->class,
                $file_source->getAliases()
            );

            return [$fq_class_name . '::' . $method_name_arg->value];
        }

        $class_arg_type = null;

        if (!$file_source instanceof StatementsAnalyzer
            || !($class_arg_type = $file_source->node_data->getType($class_arg))
        ) {
            return [];
        }

        $method_ids = [];

        foreach ($class_arg_type->getAtomicTypes() as $type_part) {
            if ($type_part instanceof TNamedObject) {
                $method_id = $type_part->value . '::' . $method_name_arg->value;

                if ($type_part->extra_types) {
                    foreach ($type_part->extra_types as $extra_type) {
                        if ($extra_type instanceof Type\Atomic\TTemplateParam
                            || $extra_type instanceof Type\Atomic\TObjectWithProperties
                        ) {
                            throw new \UnexpectedValueException('Shouldn’t get a generic param here');
                        }

                        $method_id .= '&' . $extra_type->value . '::' . $method_name_arg->value;
                    }
                }

                $method_ids[] = '$' . $method_id;
            }
        }

        return $method_ids;
    }

    /**
     * @param  StatementsAnalyzer   $statements_analyzer
     * @param  non-empty-string     $function_id
     * @param  CodeLocation         $code_location
     * @param  bool                 $can_be_in_root_scope if true, the function can be shortened to the root version
     *
     * @return bool
     */
    public static function checkFunctionExists(
        StatementsAnalyzer $statements_analyzer,
        &$function_id,
        CodeLocation $code_location,
        $can_be_in_root_scope
    ) {
        $cased_function_id = $function_id;
        $function_id = strtolower($function_id);

        $codebase = $statements_analyzer->getCodebase();

        if (!$codebase->functions->functionExists($statements_analyzer, $function_id)) {
            /** @var non-empty-lowercase-string */
            $root_function_id = preg_replace('/.*\\\/', '', $function_id);

            if ($can_be_in_root_scope
                && $function_id !== $root_function_id
                && $codebase->functions->functionExists($statements_analyzer, $root_function_id)
            ) {
                $function_id = $root_function_id;
            } else {
                if (IssueBuffer::accepts(
                    new UndefinedFunction(
                        'Function ' . $cased_function_id . ' does not exist',
                        $code_location,
                        $function_id
                    ),
                    $statements_analyzer->getSuppressedIssues()
                )) {
                    // fall through
                }

                return false;
            }
        }

        return true;
    }

    /**
     * @param PhpParser\Node\Identifier|PhpParser\Node\Name $expr
     * @param  \Psalm\Storage\Assertion[] $assertions
     * @param  string $thisName
     * @param  array<int, PhpParser\Node\Arg> $args
     * @param  Context           $context
     * @param  array<string, array<string, array{Type\Union}>> $template_type_map,
     * @param  StatementsAnalyzer $statements_analyzer
     *
     * @return void
     */
    protected static function applyAssertionsToContext(
        $expr,
        ?string $thisName,
        array $assertions,
        array $args,
        array $template_type_map,
        Context $context,
        StatementsAnalyzer $statements_analyzer
    ) {
        $type_assertions = [];

        $asserted_keys = [];

        foreach ($assertions as $assertion) {
            $assertion_var_id = null;

            $arg_value = null;

            if (is_int($assertion->var_id)) {
                if (!isset($args[$assertion->var_id])) {
                    continue;
                }

                $arg_value = $args[$assertion->var_id]->value;

                $arg_var_id = ExpressionIdentifier::getArrayVarId($arg_value, null, $statements_analyzer);

                if ($arg_var_id) {
                    $assertion_var_id = $arg_var_id;
                }
            } elseif ($assertion->var_id === '$this' && !is_null($thisName)) {
                $assertion_var_id = $thisName;
            } elseif (strpos($assertion->var_id, '$this->') === 0 && !is_null($thisName)) {
                $assertion_var_id = $thisName . str_replace('$this->', '->', $assertion->var_id);
            } elseif (isset($context->vars_in_scope[$assertion->var_id])) {
                $assertion_var_id = $assertion->var_id;
            }

            if ($assertion_var_id) {
                $rule = $assertion->rule[0][0];

                $prefix = '';
                if ($rule[0] === '!') {
                    $prefix .= '!';
                    $rule = substr($rule, 1);
                }
                if ($rule[0] === '=') {
                    $prefix .= '=';
                    $rule = substr($rule, 1);
                }
                if ($rule[0] === '~') {
                    $prefix .= '~';
                    $rule = substr($rule, 1);
                }

                if (isset($template_type_map[$rule])) {
                    foreach ($template_type_map[$rule] as $template_map) {
                        if ($template_map[0]->hasMixed()) {
                            continue 2;
                        }

                        $replacement_atomic_types = $template_map[0]->getAtomicTypes();

                        if (count($replacement_atomic_types) > 1) {
                            continue 2;
                        }

                        $ored_type_assertions = [];

                        foreach ($replacement_atomic_types as $replacement_atomic_type) {
                            if ($replacement_atomic_type instanceof Type\Atomic\TMixed) {
                                continue 3;
                            }

                            if ($replacement_atomic_type instanceof Type\Atomic\TArray
                                || $replacement_atomic_type instanceof Type\Atomic\TKeyedArray
                            ) {
                                $ored_type_assertions[] = $prefix . 'array';
                            } elseif ($replacement_atomic_type instanceof Type\Atomic\TNamedObject) {
                                $ored_type_assertions[] = $prefix . $replacement_atomic_type->value;
                            } elseif ($replacement_atomic_type instanceof Type\Atomic\Scalar) {
                                $ored_type_assertions[] = $prefix . $replacement_atomic_type->getId();
                            } elseif ($replacement_atomic_type instanceof Type\Atomic\TNull) {
                                $ored_type_assertions[] = $prefix . 'null';
                            } elseif ($replacement_atomic_type instanceof Type\Atomic\TTemplateParam) {
                                $ored_type_assertions[] = $prefix . $replacement_atomic_type->param_name;
                            }
                        }

                        if ($ored_type_assertions) {
                            $type_assertions[$assertion_var_id] = [$ored_type_assertions];
                        }
                    }
                } else {
                    if (isset($type_assertions[$assertion_var_id])) {
                        $type_assertions[$assertion_var_id] = array_merge(
                            $type_assertions[$assertion_var_id],
                            $assertion->rule
                        );
                    } else {
                        $type_assertions[$assertion_var_id] = $assertion->rule;
                    }
                }
            } elseif ($arg_value && ($assertion->rule === [['!falsy']] || $assertion->rule === [['true']])) {
                if ($assertion->rule === [['true']]) {
                    $conditional = new PhpParser\Node\Expr\BinaryOp\Identical(
                        $arg_value,
                        new PhpParser\Node\Expr\ConstFetch(new PhpParser\Node\Name('true'))
                    );

                    $assert_clauses = \Psalm\Type\Algebra::getFormula(
                        \mt_rand(0, 1000000),
                        \mt_rand(0, 1000000),
                        $conditional,
                        $context->self,
                        $statements_analyzer,
                        $statements_analyzer->getCodebase()
                    );
                } else {
                    $assert_clauses = \Psalm\Type\Algebra::getFormula(
                        \spl_object_id($arg_value),
                        \spl_object_id($arg_value),
                        $arg_value,
                        $context->self,
                        $statements_analyzer,
                        $statements_analyzer->getCodebase()
                    );
                }

                $simplified_clauses = \Psalm\Type\Algebra::simplifyCNF(
                    array_merge($context->clauses, $assert_clauses)
                );

                $assert_type_assertions = \Psalm\Type\Algebra::getTruthsFromFormula(
                    $simplified_clauses
                );

                $type_assertions = array_merge($type_assertions, $assert_type_assertions);
            } elseif ($arg_value && $assertion->rule === [['falsy']]) {
                $assert_clauses = \Psalm\Type\Algebra::negateFormula(
                    \Psalm\Type\Algebra::getFormula(
                        \spl_object_id($arg_value),
                        \spl_object_id($arg_value),
                        $arg_value,
                        $context->self,
                        $statements_analyzer,
                        $statements_analyzer->getCodebase()
                    )
                );

                $simplified_clauses = \Psalm\Type\Algebra::simplifyCNF(
                    array_merge($context->clauses, $assert_clauses)
                );

                $assert_type_assertions = \Psalm\Type\Algebra::getTruthsFromFormula(
                    $simplified_clauses
                );

                $type_assertions = array_merge($type_assertions, $assert_type_assertions);
            }
        }

        $changed_var_ids = [];

        foreach ($type_assertions as $var_id => $_) {
            $asserted_keys[$var_id] = true;
        }

        if ($type_assertions) {
            foreach (($statements_analyzer->getTemplateTypeMap() ?: []) as $template_name => $map) {
                foreach ($map as $ref => list($type)) {
                    $template_type_map[$template_name][$ref] = [
                        new Type\Union([
                            new Type\Atomic\TTemplateParam(
                                $template_name,
                                $type,
                                $ref
                            )
                        ])
                    ];
                }
            }

            // while in an and, we allow scope to boil over to support
            // statements of the form if ($x && $x->foo())
            $op_vars_in_scope = \Psalm\Type\Reconciler::reconcileKeyedTypes(
                $type_assertions,
                $type_assertions,
                $context->vars_in_scope,
                $changed_var_ids,
                $asserted_keys,
                $statements_analyzer,
                $template_type_map,
                $context->inside_loop,
                new CodeLocation($statements_analyzer->getSource(), $expr)
            );

            foreach ($changed_var_ids as $var_id => $_) {
                if (isset($op_vars_in_scope[$var_id])) {
                    $first_appearance = $statements_analyzer->getFirstAppearance($var_id);

                    $codebase = $statements_analyzer->getCodebase();

                    if ($first_appearance
                        && isset($context->vars_in_scope[$var_id])
                        && $context->vars_in_scope[$var_id]->hasMixed()
                    ) {
                        if (!$context->collect_initializations
                            && !$context->collect_mutations
                            && $statements_analyzer->getFilePath() === $statements_analyzer->getRootFilePath()
                            && (!(($parent_source = $statements_analyzer->getSource())
                                        instanceof \Psalm\Internal\Analyzer\FunctionLikeAnalyzer)
                                    || !$parent_source->getSource() instanceof \Psalm\Internal\Analyzer\TraitAnalyzer)
                        ) {
                            $codebase->analyzer->decrementMixedCount($statements_analyzer->getFilePath());
                        }

                        IssueBuffer::remove(
                            $statements_analyzer->getFilePath(),
                            'MixedAssignment',
                            $first_appearance->raw_file_start
                        );
                    }

                    $op_vars_in_scope[$var_id]->from_docblock = true;

                    foreach ($op_vars_in_scope[$var_id]->getAtomicTypes() as $changed_atomic_type) {
                        $changed_atomic_type->from_docblock = true;

                        if ($changed_atomic_type instanceof Type\Atomic\TNamedObject
                            && $changed_atomic_type->extra_types
                        ) {
                            foreach ($changed_atomic_type->extra_types as $extra_type) {
                                $extra_type->from_docblock = true;
                            }
                        }
                    }
                }
            }

            $context->vars_in_scope = $op_vars_in_scope;
        }
    }

    public static function checkTemplateResult(
        StatementsAnalyzer $statements_analyzer,
        TemplateResult $template_result,
        CodeLocation $code_location,
        ?string $function_id
    ) : void {
        if ($template_result->upper_bounds && $template_result->lower_bounds) {
            foreach ($template_result->lower_bounds as $template_name => $defining_map) {
                foreach ($defining_map as $defining_id => list($lower_bound_type)) {
                    if (isset($template_result->upper_bounds[$template_name][$defining_id])) {
                        $upper_bound_type = $template_result->upper_bounds[$template_name][$defining_id][0];

                        $union_comparison_result = new \Psalm\Internal\Type\Comparator\TypeComparisonResult();

                        if (count($template_result->lower_bounds_unintersectable_types) > 1) {
                            $upper_bound_type = $template_result->lower_bounds_unintersectable_types[0];
                            $lower_bound_type = $template_result->lower_bounds_unintersectable_types[1];
                        }

                        if (!UnionTypeComparator::isContainedBy(
                            $statements_analyzer->getCodebase(),
                            $upper_bound_type,
                            $lower_bound_type,
                            false,
                            false,
                            $union_comparison_result
                        )) {
                            if ($union_comparison_result->type_coerced) {
                                if ($union_comparison_result->type_coerced_from_mixed) {
                                    if (IssueBuffer::accepts(
                                        new MixedArgumentTypeCoercion(
                                            'Type ' . $upper_bound_type->getId() . ' should be a subtype of '
                                                . $lower_bound_type->getId(),
                                            $code_location,
                                            $function_id
                                        ),
                                        $statements_analyzer->getSuppressedIssues()
                                    )) {
                                        // continue
                                    }
                                } else {
                                    if (IssueBuffer::accepts(
                                        new ArgumentTypeCoercion(
                                            'Type ' . $upper_bound_type->getId() . ' should be a subtype of '
                                                . $lower_bound_type->getId(),
                                            $code_location,
                                            $function_id
                                        ),
                                        $statements_analyzer->getSuppressedIssues()
                                    )) {
                                        // continue
                                    }
                                }
                            } elseif ($union_comparison_result->scalar_type_match_found) {
                                if (IssueBuffer::accepts(
                                    new InvalidScalarArgument(
                                        'Type ' . $upper_bound_type->getId() . ' should be a subtype of '
                                                . $lower_bound_type->getId(),
                                        $code_location,
                                        $function_id
                                    ),
                                    $statements_analyzer->getSuppressedIssues()
                                )) {
                                    // continue
                                }
                            } else {
                                if (IssueBuffer::accepts(
                                    new InvalidArgument(
                                        'Type ' . $upper_bound_type->getId() . ' should be a subtype of '
                                                . $lower_bound_type->getId(),
                                        $code_location,
                                        $function_id
                                    ),
                                    $statements_analyzer->getSuppressedIssues()
                                )) {
                                    // continue
                                }
                            }
                        }
                    } else {
                        $template_result->upper_bounds[$template_name][$defining_id][0] = clone $lower_bound_type;
                    }
                }
            }
        }
    }
}