/FileExtraction/Java_unseen/mistupv_JavaSlicer/javaparser-symbol-solver-core/src/main/java/com/github/javaparser/symbolsolver/javaparsermodel/JavaParserFacade.java
/*
 * Copyright (C) 2015-2016 Federico Tomassetti
 * Copyright (C) 2017-2020 The JavaParser Team.
 *
 * This file is part of JavaParser.
 *
 * JavaParser can be used either under the terms of
 * a) the GNU Lesser General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 * b) the terms of the Apache License
 *
 * You should have received a copy of both licenses in LICENCE.LGPL and
 * LICENCE.APACHE. Please refer to those files for details.
 *
 * JavaParser is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 */

package com.github.javaparser.symbolsolver.javaparsermodel;

import com.github.javaparser.ast.CompilationUnit;
import com.github.javaparser.ast.DataKey;
import com.github.javaparser.ast.Node;
import com.github.javaparser.ast.NodeList;
import com.github.javaparser.ast.body.*;
import com.github.javaparser.ast.expr.*;
import com.github.javaparser.ast.stmt.ExplicitConstructorInvocationStmt;
import com.github.javaparser.ast.type.*;
import com.github.javaparser.resolution.MethodAmbiguityException;
import com.github.javaparser.resolution.MethodUsage;
import com.github.javaparser.resolution.UnsolvedSymbolException;
import com.github.javaparser.resolution.declarations.*;
import com.github.javaparser.resolution.types.*;
import com.github.javaparser.symbolsolver.core.resolution.Context;
import com.github.javaparser.symbolsolver.javaparsermodel.contexts.FieldAccessContext;
import com.github.javaparser.symbolsolver.javaparsermodel.declarations.JavaParserAnonymousClassDeclaration;
import com.github.javaparser.symbolsolver.javaparsermodel.declarations.JavaParserEnumDeclaration;
import com.github.javaparser.symbolsolver.javaparsermodel.declarations.JavaParserTypeVariableDeclaration;
import com.github.javaparser.symbolsolver.model.resolution.SymbolReference;
import com.github.javaparser.symbolsolver.model.resolution.TypeSolver;
import com.github.javaparser.symbolsolver.model.typesystem.ReferenceTypeImpl;
import com.github.javaparser.symbolsolver.reflectionmodel.ReflectionAnnotationDeclaration;
import com.github.javaparser.symbolsolver.reflectionmodel.ReflectionClassDeclaration;
import com.github.javaparser.symbolsolver.reflectionmodel.ReflectionEnumDeclaration;
import com.github.javaparser.symbolsolver.reflectionmodel.ReflectionInterfaceDeclaration;
import com.github.javaparser.symbolsolver.resolution.ConstructorResolutionLogic;
import com.github.javaparser.symbolsolver.resolution.MethodResolutionLogic;
import com.github.javaparser.symbolsolver.resolution.SymbolSolver;
import com.github.javaparser.utils.Log;

import java.util.*;
import java.util.stream.Collectors;

import static com.github.javaparser.symbolsolver.javaparser.Navigator.demandParentNode;
import static com.github.javaparser.symbolsolver.model.resolution.SymbolReference.solved;
import static com.github.javaparser.symbolsolver.model.resolution.SymbolReference.unsolved;

/**
 * Class to be used by final users to solve symbols for JavaParser ASTs.
 *
 * @author Federico Tomassetti
 */
public class JavaParserFacade {

    private static final DataKey<ResolvedType> TYPE_WITH_LAMBDAS_RESOLVED = new DataKey<ResolvedType>() {
    };
    private static final DataKey<ResolvedType> TYPE_WITHOUT_LAMBDAS_RESOLVED = new DataKey<ResolvedType>() {
    };

    private static final Map<TypeSolver, JavaParserFacade> instances = new WeakHashMap<>();
    
    private static String JAVA_LANG_STRING = String.class.getCanonicalName();
    
    private final TypeSolver typeSolver;
    private final TypeExtractor typeExtractor;
    private final SymbolSolver symbolSolver;

    private JavaParserFacade(TypeSolver typeSolver) {
        this.typeSolver = typeSolver.getRoot();
        this.symbolSolver = new SymbolSolver(typeSolver);
        this.typeExtractor = new TypeExtractor(typeSolver, this);
    }

    public TypeSolver getTypeSolver() {
        return typeSolver;
    }

    public SymbolSolver getSymbolSolver() {
        return symbolSolver;
    }

    /**
     * Note that the addition of the modifier {@code synchronized} is specific and directly in response to issue #2668.
     * <br>This <strong>MUST NOT</strong> be misinterpreted as a signal that JavaParser is safe to use within a multi-threaded environment.
     * <br>
     * <br>Additional discussion and context from a user attempting multithreading can be found within issue #2671 .
     * <br>
     *
     * @see <a href="https://github.com/javaparser/javaparser/issues/2668">https://github.com/javaparser/javaparser/issues/2668</a>
     * @see <a href="https://github.com/javaparser/javaparser/issues/2671">https://github.com/javaparser/javaparser/issues/2671</a>
     */
    public synchronized static JavaParserFacade get(TypeSolver typeSolver) {
        return instances.computeIfAbsent(typeSolver, JavaParserFacade::new);
    }

    /**
     * This method is used to clear internal caches for the sake of releasing memory.
     */
    public static void clearInstances() {
        instances.clear();
    }

    protected static ResolvedType solveGenericTypes(ResolvedType type, Context context) {
        if (type.isTypeVariable()) {
            return context.solveGenericType(type.describe()).orElse(type);
        }
        if (type.isWildcard()) {
            if (type.asWildcard().isExtends() || type.asWildcard().isSuper()) {
                ResolvedWildcard wildcardUsage = type.asWildcard();
                ResolvedType boundResolved = solveGenericTypes(wildcardUsage.getBoundedType(), context);
                if (wildcardUsage.isExtends()) {
                    return ResolvedWildcard.extendsBound(boundResolved);
                } else {
                    return ResolvedWildcard.superBound(boundResolved);
                }
            }
        }
        return type;
    }

    public SymbolReference<? extends ResolvedValueDeclaration> solve(NameExpr nameExpr) {
        return symbolSolver.solveSymbol(nameExpr.getName().getId(), nameExpr);
    }

    public SymbolReference<? extends ResolvedValueDeclaration> solve(SimpleName nameExpr) {
        return symbolSolver.solveSymbol(nameExpr.getId(), nameExpr);
    }

    public SymbolReference<? extends ResolvedValueDeclaration> solve(Expression expr) {
        return expr.toNameExpr().map(this::solve).orElseThrow(() -> new IllegalArgumentException(expr.getClass().getCanonicalName()));
    }

    public SymbolReference<ResolvedMethodDeclaration> solve(MethodCallExpr methodCallExpr) {
        return solve(methodCallExpr, true);
    }

    public SymbolReference<ResolvedMethodDeclaration> solve(MethodReferenceExpr methodReferenceExpr) {
        return solve(methodReferenceExpr, true);
    }

    public SymbolReference<ResolvedConstructorDeclaration> solve(ObjectCreationExpr objectCreationExpr) {
        return solve(objectCreationExpr, true);
    }

    public SymbolReference<ResolvedConstructorDeclaration> solve(ExplicitConstructorInvocationStmt explicitConstructorInvocationStmt) {
        return solve(explicitConstructorInvocationStmt, true);
    }

    public SymbolReference<ResolvedConstructorDeclaration> solve(ExplicitConstructorInvocationStmt explicitConstructorInvocationStmt, boolean solveLambdas) {
        // Constructor invocation must exist within a class (not interface).
        Optional<ClassOrInterfaceDeclaration> optAncestorClassOrInterfaceNode = explicitConstructorInvocationStmt.findAncestor(ClassOrInterfaceDeclaration.class);
        if (!optAncestorClassOrInterfaceNode.isPresent()) {
            return unsolved(ResolvedConstructorDeclaration.class);
        }

        ClassOrInterfaceDeclaration classOrInterfaceNode = optAncestorClassOrInterfaceNode.get();
        ResolvedReferenceTypeDeclaration resolvedClassNode = classOrInterfaceNode.resolve();
        if (!resolvedClassNode.isClass()) {
            throw new IllegalStateException("Expected to be a class -- cannot call this() or super() within an interface.");
        }

        ResolvedTypeDeclaration typeDecl = null;
        if (explicitConstructorInvocationStmt.isThis()) {
            // this()
            typeDecl = resolvedClassNode.asReferenceType();
        } else {
            // super()
            Optional<ResolvedReferenceType> superClass = resolvedClassNode.asClass().getSuperClass();
            if (superClass.isPresent() && superClass.get().getTypeDeclaration().isPresent()) {
                typeDecl = superClass.get().getTypeDeclaration().get();
            }
        }
        if (typeDecl == null) {
            return unsolved(ResolvedConstructorDeclaration.class);
        }

        // Solve each of the arguments being passed into this constructor invocation.
        List<ResolvedType> argumentTypes = new LinkedList<>();
        List<LambdaArgumentTypePlaceholder> placeholders = new LinkedList<>();
        solveArguments(explicitConstructorInvocationStmt, explicitConstructorInvocationStmt.getArguments(), solveLambdas, argumentTypes, placeholders);

        // Determine which constructor is referred to, and return it.
        SymbolReference<ResolvedConstructorDeclaration> res = ConstructorResolutionLogic.findMostApplicable(((ResolvedClassDeclaration) typeDecl).getConstructors(), argumentTypes, typeSolver);
        for (LambdaArgumentTypePlaceholder placeholder : placeholders) {
            placeholder.setMethod(res);
        }

        return res;
    }

    public SymbolReference<ResolvedTypeDeclaration> solve(ThisExpr node) {
        // If 'this' is prefixed by a class eg. MyClass.this
        if (node.getTypeName().isPresent()) {
            // Get the class name
            String className = node.getTypeName().get().asString();
            // Attempt to resolve using a typeSolver
            SymbolReference<ResolvedReferenceTypeDeclaration> clazz = typeSolver.tryToSolveType(className);
            if (clazz.isSolved()) {
                return solved(clazz.getCorrespondingDeclaration());
            }
            // Attempt to resolve locally in Compilation unit
            Optional<CompilationUnit> cu = node.findAncestor(CompilationUnit.class);
            if (cu.isPresent()) {
                Optional<ClassOrInterfaceDeclaration> classByName = cu.get().getClassByName(className);
                if (classByName.isPresent()) {
                    return solved(getTypeDeclaration(classByName.get()));
                }
            }
        }
        return solved(getTypeDeclaration(findContainingTypeDeclOrObjectCreationExpr(node)));
    }

    /**
     * Given a constructor call find out to which constructor declaration it corresponds.
     */
    public SymbolReference<ResolvedConstructorDeclaration> solve(ObjectCreationExpr objectCreationExpr, boolean solveLambdas) {
        List<ResolvedType> argumentTypes = new LinkedList<>();
        List<LambdaArgumentTypePlaceholder> placeholders = new LinkedList<>();

        solveArguments(objectCreationExpr, objectCreationExpr.getArguments(), solveLambdas, argumentTypes, placeholders);

        ResolvedReferenceTypeDeclaration typeDecl = null;
        if (objectCreationExpr.getAnonymousClassBody().isPresent()) {
            typeDecl = new JavaParserAnonymousClassDeclaration(objectCreationExpr, typeSolver);
        } else {
            ResolvedType classDecl = JavaParserFacade.get(typeSolver).convert(objectCreationExpr.getType(), objectCreationExpr);
            if (classDecl.isReferenceType() && classDecl.asReferenceType().getTypeDeclaration().isPresent()) {
                typeDecl = classDecl.asReferenceType().getTypeDeclaration().get();
            }
        }
        if (typeDecl == null) {
            return unsolved(ResolvedConstructorDeclaration.class);
        }
        SymbolReference<ResolvedConstructorDeclaration> res = ConstructorResolutionLogic.findMostApplicable(typeDecl.getConstructors(), argumentTypes, typeSolver);
        for (LambdaArgumentTypePlaceholder placeholder : placeholders) {
            placeholder.setMethod(res);
        }
        return res;
    }

    private void solveArguments(Node node, NodeList<Expression> args, boolean solveLambdas, List<ResolvedType> argumentTypes,
                                List<LambdaArgumentTypePlaceholder> placeholders) {
        int i = 0;
        for (Expression parameterValue : args) {
            if (parameterValue instanceof LambdaExpr || parameterValue instanceof MethodReferenceExpr) {
                LambdaArgumentTypePlaceholder placeholder = new LambdaArgumentTypePlaceholder(i);
                argumentTypes.add(placeholder);
                placeholders.add(placeholder);
            } else {
                try {
                    argumentTypes.add(JavaParserFacade.get(typeSolver).getType(parameterValue, solveLambdas));
                } catch (UnsolvedSymbolException e) {
                    throw e;
                } catch (Exception e) {
                    throw new RuntimeException(String.format("Unable to calculate the type of a parameter of a method call. Method call: %s, Parameter: %s",
                            node, parameterValue), e);
                }
            }
            i++;
        }
    }

    /**
     * Given a method call find out to which method declaration it corresponds.
     */
    public SymbolReference<ResolvedMethodDeclaration> solve(MethodCallExpr methodCallExpr, boolean solveLambdas) {
        List<ResolvedType> argumentTypes = new LinkedList<>();
        List<LambdaArgumentTypePlaceholder> placeholders = new LinkedList<>();

        solveArguments(methodCallExpr, methodCallExpr.getArguments(), solveLambdas, argumentTypes, placeholders);

        SymbolReference<ResolvedMethodDeclaration> res = JavaParserFactory.getContext(methodCallExpr, typeSolver).solveMethod(methodCallExpr.getName().getId(), argumentTypes, false);
        for (LambdaArgumentTypePlaceholder placeholder : placeholders) {
            placeholder.setMethod(res);
        }
        return res;
    }

    /**
     * Given a method reference find out to which method declaration it corresponds.
     */
    public SymbolReference<ResolvedMethodDeclaration> solve(MethodReferenceExpr methodReferenceExpr, boolean solveLambdas) {
        // pass empty argument list to be populated
        List<ResolvedType> argumentTypes = new LinkedList<>();
        return JavaParserFactory.getContext(methodReferenceExpr, typeSolver).solveMethod(methodReferenceExpr.getIdentifier(), argumentTypes, false);
    }

    public SymbolReference<ResolvedAnnotationDeclaration> solve(AnnotationExpr annotationExpr) {
        Context context = JavaParserFactory.getContext(annotationExpr, typeSolver);
        SymbolReference<ResolvedTypeDeclaration> typeDeclarationSymbolReference = context.solveType(annotationExpr.getNameAsString());
        if (typeDeclarationSymbolReference.isSolved()) {
            ResolvedAnnotationDeclaration annotationDeclaration = (ResolvedAnnotationDeclaration) typeDeclarationSymbolReference.getCorrespondingDeclaration();
            return solved(annotationDeclaration);
        } else {
            return unsolved(ResolvedAnnotationDeclaration.class);
        }
    }

    public SymbolReference<ResolvedValueDeclaration> solve(FieldAccessExpr fieldAccessExpr) {
        return ((FieldAccessContext) JavaParserFactory.getContext(fieldAccessExpr, typeSolver)).solveField(fieldAccessExpr.getName().getId());
    }

    /**
     * Get the type associated with the node.
     * <p>
     * This method was originally intended to get the type of a value: any value has a type.
     * <p>
     * For example:
     * <pre>
     * int foo(int a) {
     *     return a; // when getType is invoked on "a" it returns the type "int"
     * }
     * </pre>
     * <p>
     * Now, users started using also of names of types itself, which do not have a type.
     * <p>
     * For example:
     * <pre>
     * class A {
     *     int foo(int a) {
     *         return A.someStaticField; // when getType is invoked on "A", which represents a class, it returns
     *             // the type "A" itself while it used to throw UnsolvedSymbolException
     * }
     * </pre>
     * <p>
     * To accommodate this usage and avoid confusion this method return
     * the type itself when used on the name of type.
     */
    public ResolvedType getType(Node node) {
        try {
            return getType(node, true);
        } catch (UnsolvedSymbolException e) {
            if (node instanceof NameExpr) {
                NameExpr nameExpr = (NameExpr) node;
                SymbolReference<ResolvedTypeDeclaration> typeDeclaration = JavaParserFactory.getContext(node, typeSolver)
                        .solveType(nameExpr.getNameAsString());
                if (typeDeclaration.isSolved() && typeDeclaration.getCorrespondingDeclaration() instanceof ResolvedReferenceTypeDeclaration) {
                    ResolvedReferenceTypeDeclaration resolvedReferenceTypeDeclaration = (ResolvedReferenceTypeDeclaration) typeDeclaration.getCorrespondingDeclaration();
                    return ReferenceTypeImpl.undeterminedParameters(resolvedReferenceTypeDeclaration, typeSolver);
                }
            }
            throw e;
        }
    }

    public ResolvedType getType(Node node, boolean solveLambdas) {
        if (solveLambdas) {
            if (!node.containsData(TYPE_WITH_LAMBDAS_RESOLVED)) {
                ResolvedType res = getTypeConcrete(node, solveLambdas);

                node.setData(TYPE_WITH_LAMBDAS_RESOLVED, res);

                boolean secondPassNecessary = false;
                if (node instanceof MethodCallExpr) {
                    MethodCallExpr methodCallExpr = (MethodCallExpr) node;
                    for (Node arg : methodCallExpr.getArguments()) {
                        if (!arg.containsData(TYPE_WITH_LAMBDAS_RESOLVED)) {
                            getType(arg, true);
                            secondPassNecessary = true;
                        }
                    }
                }
                if (secondPassNecessary) {
                    node.removeData(TYPE_WITH_LAMBDAS_RESOLVED);
                    ResolvedType type = getType(node, true);
                    node.setData(TYPE_WITH_LAMBDAS_RESOLVED, type);

                }
                Log.trace("getType on %s  -> %s", () -> node, () -> res);
            }
            return node.getData(TYPE_WITH_LAMBDAS_RESOLVED);
        } else {
            Optional<ResolvedType> res = find(TYPE_WITH_LAMBDAS_RESOLVED, node);
            if (res.isPresent()) {
                return res.get();
            }
            res = find(TYPE_WITHOUT_LAMBDAS_RESOLVED, node);
            if (!res.isPresent()) {
                ResolvedType resType = getTypeConcrete(node, solveLambdas);
                node.setData(TYPE_WITHOUT_LAMBDAS_RESOLVED, resType);
                Optional<ResolvedType> finalRes = res;
                Log.trace("getType on %s (no solveLambdas) -> %s", () -> node, () -> finalRes);
                return resType;
            }
            return res.get();
        }
    }

    private Optional<ResolvedType> find(DataKey<ResolvedType> dataKey, Node node) {
        if (node.containsData(dataKey)) {
            return Optional.of(node.getData(dataKey));
        }
        return Optional.empty();
    }

    protected MethodUsage toMethodUsage(MethodReferenceExpr methodReferenceExpr, List<ResolvedType> paramTypes) {
        Expression scope = methodReferenceExpr.getScope();
        ResolvedType typeOfScope = getType(methodReferenceExpr.getScope());
        if (!typeOfScope.isReferenceType()) {
            throw new UnsupportedOperationException(typeOfScope.getClass().getCanonicalName());
        }

        Optional<MethodUsage> result;
        Set<MethodUsage> allMethods = typeOfScope.asReferenceType().getTypeDeclaration()
                .orElseThrow(() -> new RuntimeException("TypeDeclaration unexpectedly empty."))
                .getAllMethods();

        if (scope instanceof TypeExpr) {
            // static methods should match all params
            List<MethodUsage> staticMethodUsages = allMethods.stream()
                    .filter(it -> it.getDeclaration().isStatic())
                    .collect(Collectors.toList());

            result = MethodResolutionLogic.findMostApplicableUsage(staticMethodUsages, methodReferenceExpr.getIdentifier(), paramTypes, typeSolver);

            if (!paramTypes.isEmpty()) {
                // instance methods are called on the first param and should match all other params
                List<MethodUsage> instanceMethodUsages = allMethods.stream()
                        .filter(it -> !it.getDeclaration().isStatic())
                        .collect(Collectors.toList());

                List<ResolvedType> instanceMethodParamTypes = new ArrayList<>(paramTypes);
                instanceMethodParamTypes.remove(0); // remove the first one

                Optional<MethodUsage> instanceResult = MethodResolutionLogic.findMostApplicableUsage(
                        instanceMethodUsages, methodReferenceExpr.getIdentifier(), instanceMethodParamTypes, typeSolver);
                if (result.isPresent() && instanceResult.isPresent()) {
                    throw new MethodAmbiguityException("Ambiguous method call: cannot find a most applicable method for " + methodReferenceExpr.getIdentifier());
                }

                if (instanceResult.isPresent()) {
                    result = instanceResult;
                }
            }
        } else {
            result = MethodResolutionLogic.findMostApplicableUsage(new ArrayList<>(allMethods), methodReferenceExpr.getIdentifier(), paramTypes, typeSolver);

            if (result.isPresent() && result.get().getDeclaration().isStatic()) {
                throw new RuntimeException("Invalid static method reference " + methodReferenceExpr.getIdentifier());
            }
        }

        if (!result.isPresent()) {
            throw new UnsupportedOperationException();
        }

        return result.get();
    }

    protected ResolvedType getBinaryTypeConcrete(Node left, Node right, boolean solveLambdas, BinaryExpr.Operator operator) {
        ResolvedType leftType = getTypeConcrete(left, solveLambdas);
        ResolvedType rightType = getTypeConcrete(right, solveLambdas);

        // JLS 15.18.1. String Concatenation Operator +
        // If only one operand expression is of type String, then string conversion (§5.1.11) is performed on the other
        // operand to produce a string at run time.
        //
        // The result of string concatenation is a reference to a String object that is the concatenation of the two
        // operand strings. The characters of the left-hand operand precede the characters of the right-hand operand in
        // the newly created string.

        if (operator == BinaryExpr.Operator.PLUS) {
            boolean isLeftString = leftType.isReferenceType() && leftType.asReferenceType()
                    .getQualifiedName().equals(JAVA_LANG_STRING);
            boolean isRightString = rightType.isReferenceType() && rightType.asReferenceType()
                    .getQualifiedName().equals(JAVA_LANG_STRING);
            if (isLeftString || isRightString) {
                return isLeftString ? leftType : rightType;
            }
        }

        // JLS 5.6.2. Binary Numeric Promotion
        //
        // Widening primitive conversion (§5.1.2) is applied to convert either or both operands as specified by the
        // following rules:
        //
        // * If either operand is of type double, the other is converted to double.
        // * Otherwise, if either operand is of type float, the other is converted to float.
        // * Otherwise, if either operand is of type long, the other is converted to long.
        // * Otherwise, both operands are converted to type int.

        boolean isLeftNumeric = leftType.isPrimitive() && leftType.asPrimitive().isNumeric();
        boolean isRightNumeric = rightType.isPrimitive() && rightType.asPrimitive().isNumeric();

        if (isLeftNumeric && isRightNumeric) {
            return leftType.asPrimitive().bnp(rightType.asPrimitive());
        }

        if (rightType.isAssignableBy(leftType)) {
            return rightType;
        }
        return leftType;
    }


    /**
     * Should return more like a TypeApplication: a TypeDeclaration and possible typeParametersValues or array
     * modifiers.
     */
    private ResolvedType getTypeConcrete(Node node, boolean solveLambdas) {
        if (node == null) throw new IllegalArgumentException();
        return node.accept(typeExtractor, solveLambdas);
    }

    /**
     * Where a node has an interface/class/enum declaration as its ancestor, return the nearest one.
     * <p>
     * NOTE: See {@link #findContainingTypeDeclOrObjectCreationExpr} if wanting to include anonymous inner classes.
     * <p>
     * For example, these all return X:
     * {@code public interface X { ... node here ... }}
     * {@code public class X { ... node here ... }}
     * {@code public enum X { ... node here ... }}
     *
     * @param node The Node whose ancestors will be traversed,
     * @return The first class/interface/enum declaration in the Node's ancestry.
     */
    protected TypeDeclaration<?> findContainingTypeDecl(Node node) {
        Node parent = node;
        while (true) {
            parent = demandParentNode(parent);
            if (parent instanceof TypeDeclaration) {
                return (TypeDeclaration<?>) parent;
            }
        }
    }

    /**
     * Where a node has an interface/class/enum declaration -- or an object creation expression (anonymous inner class)
     * -- as its ancestor, return the nearest one.
     * <p>
     * NOTE: See {@link #findContainingTypeDecl} if wanting to not include anonymous inner classes.
     * <p>
     * For example, these all return X:
     * <ul>
     *     <li>{@code public interface X { ... node here ... }}</li>
     *     <li>{@code public class X { ... node here ... }}</li>
     *     <li>{@code public enum X { ... node here ... }}</li>
     *     <li><pre>{@code
     *     new ActionListener() {
     *          ... node here ...
     *          public void actionPerformed(ActionEvent e) {
     *               ... or node here ...
     *          }
     *     }
     *     }</pre></li>
     * </ul>
     * <p>
     *
     * @param node The Node whose ancestors will be traversed,
     * @return The first class/interface/enum declaration -- or object creation expression (anonymous inner class) -- in
     * the Node's ancestry.
     */
    protected Node findContainingTypeDeclOrObjectCreationExpr(Node node) {
        Node parent = node;
        boolean detachFlag = false;
        while (true) {
            parent = demandParentNode(parent);
            if (parent instanceof BodyDeclaration) {
                if (parent instanceof TypeDeclaration) {
                    return parent;
                } else {
                    detachFlag = true;
                }
            } else if (parent instanceof ObjectCreationExpr) {
                if (detachFlag) {
                    return parent;
                }
            }
        }
    }

    /**
     * Where a node has an interface/class/enum declaration -- or an object creation expression in an inner class
     * references an outer class -- as its ancestor, return the declaration corresponding to the class name specified.
     */
    protected Node findContainingTypeDeclOrObjectCreationExpr(Node node, String className) {
        Node parent = node;
        boolean detachFlag = false;
        while (true) {
            parent = demandParentNode(parent);
            if (parent instanceof BodyDeclaration) {
                if (parent instanceof TypeDeclaration && ((TypeDeclaration<?>) parent).getFullyQualifiedName().get().endsWith(className)) {
                    return parent;
                } else {
                    detachFlag = true;
                }
            } else if (parent instanceof ObjectCreationExpr) {
                if (detachFlag) {
                    return parent;
                }
            }
        }
    }


    public ResolvedType convertToUsageVariableType(VariableDeclarator var) {
        return get(typeSolver).convertToUsage(var.getType(), var);
    }

    public ResolvedType convertToUsage(Type type, Node context) {
        if (type.isUnknownType()) {
            throw new IllegalArgumentException("Inferred lambda parameter type");
        }
        return convertToUsage(type, JavaParserFactory.getContext(context, typeSolver));
    }

    public ResolvedType convertToUsage(Type type) {
        return convertToUsage(type, type);
    }

    // This is an hack around an issue in JavaParser
    private String qName(ClassOrInterfaceType classOrInterfaceType) {
        String name = classOrInterfaceType.getName().getId();
        if (classOrInterfaceType.getScope().isPresent()) {
            return qName(classOrInterfaceType.getScope().get()) + "." + name;
        }
        return name;
    }

    protected ResolvedType convertToUsage(Type type, Context context) {
        if (context == null) {
            throw new NullPointerException("Context should not be null");
        }
        if (type instanceof ClassOrInterfaceType) {
            ClassOrInterfaceType classOrInterfaceType = (ClassOrInterfaceType) type;
            String name = qName(classOrInterfaceType);
            SymbolReference<ResolvedTypeDeclaration> ref = context.solveType(name);
            if (!ref.isSolved()) {
                throw new UnsolvedSymbolException(name);
            }
            ResolvedTypeDeclaration typeDeclaration = ref.getCorrespondingDeclaration();
            List<ResolvedType> typeParameters = Collections.emptyList();
            if (classOrInterfaceType.getTypeArguments().isPresent()) {
                typeParameters = classOrInterfaceType.getTypeArguments().get().stream().map((pt) -> convertToUsage(pt, context)).collect(Collectors.toList());
            }
            if (typeDeclaration.isTypeParameter()) {
                if (typeDeclaration instanceof ResolvedTypeParameterDeclaration) {
                    return new ResolvedTypeVariable((ResolvedTypeParameterDeclaration) typeDeclaration);
                } else {
                    JavaParserTypeVariableDeclaration javaParserTypeVariableDeclaration = (JavaParserTypeVariableDeclaration) typeDeclaration;
                    return new ResolvedTypeVariable(javaParserTypeVariableDeclaration.asTypeParameter());
                }
            } else {
                return new ReferenceTypeImpl((ResolvedReferenceTypeDeclaration) typeDeclaration, typeParameters, typeSolver);
            }
        } else if (type instanceof PrimitiveType) {
            return ResolvedPrimitiveType.byName(((PrimitiveType) type).getType().name());
        } else if (type instanceof WildcardType) {
            WildcardType wildcardType = (WildcardType) type;
            if (wildcardType.getExtendedType().isPresent() && !wildcardType.getSuperType().isPresent()) {
                return ResolvedWildcard.extendsBound(convertToUsage(wildcardType.getExtendedType().get(), context)); // removed (ReferenceTypeImpl)
            } else if (!wildcardType.getExtendedType().isPresent() && wildcardType.getSuperType().isPresent()) {
                return ResolvedWildcard.superBound(convertToUsage(wildcardType.getSuperType().get(), context)); // removed (ReferenceTypeImpl)
            } else if (!wildcardType.getExtendedType().isPresent() && !wildcardType.getSuperType().isPresent()) {
                return ResolvedWildcard.UNBOUNDED;
            } else {
                throw new UnsupportedOperationException(wildcardType.toString());
            }
        } else if (type instanceof VoidType) {
            return ResolvedVoidType.INSTANCE;
        } else if (type instanceof ArrayType) {
            ArrayType jpArrayType = (ArrayType) type;
            return new ResolvedArrayType(convertToUsage(jpArrayType.getComponentType(), context));
        } else if (type instanceof UnionType) {
            UnionType unionType = (UnionType) type;
            return new ResolvedUnionType(unionType.getElements().stream().map(el -> convertToUsage(el, context)).collect(Collectors.toList()));
        } else if (type instanceof VarType) {
            Node parent = type.getParentNode().get();
            if (!(parent instanceof VariableDeclarator)) {
                throw new IllegalStateException("Trying to resolve a `var` which is not in a variable declaration.");
            }
            final VariableDeclarator variableDeclarator = (VariableDeclarator) parent;
            return variableDeclarator.getInitializer()
                    .map(Expression::calculateResolvedType)
                    .orElseThrow(() -> new IllegalStateException("Cannot resolve `var` which has no initializer."));
        } else {
            throw new UnsupportedOperationException(type.getClass().getCanonicalName());
        }
    }


    public ResolvedType convert(Type type, Node node) {
        return convert(type, JavaParserFactory.getContext(node, typeSolver));
    }

    public ResolvedType convert(Type type, Context context) {
        return convertToUsage(type, context);
    }

    public MethodUsage solveMethodAsUsage(MethodCallExpr call) {
        List<ResolvedType> params = new ArrayList<>();
        if (call.getArguments() != null) {
            for (Expression param : call.getArguments()) {
                //getTypeConcrete(Node node, boolean solveLambdas)
                try {
                    params.add(getType(param, false));
                } catch (Exception e) {
                    throw new RuntimeException(String.format("Error calculating the type of parameter %s of method call %s", param, call), e);
                }
                //params.add(getTypeConcrete(param, false));
            }
        }
        Context context = JavaParserFactory.getContext(call, typeSolver);
        Optional<MethodUsage> methodUsage = context.solveMethodAsUsage(call.getName().getId(), params);
        if (!methodUsage.isPresent()) {
            throw new RuntimeException("Method '" + call.getName() + "' cannot be resolved in context "
                    + call + " (line: " + call.getRange().map(r -> "" + r.begin.line).orElse("??") + ") " + context + ". Parameter types: " + params);
        }
        return methodUsage.get();
    }

    public ResolvedReferenceTypeDeclaration getTypeDeclaration(Node node) {
        if (node instanceof TypeDeclaration) {
            return getTypeDeclaration((TypeDeclaration) node);
        } else if (node instanceof ObjectCreationExpr) {
            return new JavaParserAnonymousClassDeclaration((ObjectCreationExpr) node, typeSolver);
        } else {
            throw new IllegalArgumentException();
        }
    }

    public ResolvedReferenceTypeDeclaration getTypeDeclaration(ClassOrInterfaceDeclaration classOrInterfaceDeclaration) {
        return JavaParserFactory.toTypeDeclaration(classOrInterfaceDeclaration, typeSolver);
    }

    /**
     * "this" inserted in the given point, which type would have?
     */
    public ResolvedType getTypeOfThisIn(Node node) {
        // TODO consider static methods
        if (node instanceof ClassOrInterfaceDeclaration) {
            return new ReferenceTypeImpl(getTypeDeclaration((ClassOrInterfaceDeclaration) node), typeSolver);
        } else if (node instanceof EnumDeclaration) {
            JavaParserEnumDeclaration enumDeclaration = new JavaParserEnumDeclaration((EnumDeclaration) node, typeSolver);
            return new ReferenceTypeImpl(enumDeclaration, typeSolver);
        } else if (node instanceof ObjectCreationExpr && ((ObjectCreationExpr) node).getAnonymousClassBody().isPresent()) {
            JavaParserAnonymousClassDeclaration anonymousDeclaration = new JavaParserAnonymousClassDeclaration((ObjectCreationExpr) node, typeSolver);
            return new ReferenceTypeImpl(anonymousDeclaration, typeSolver);
        }
        return getTypeOfThisIn(demandParentNode(node));
    }

    public ResolvedReferenceTypeDeclaration getTypeDeclaration(TypeDeclaration<?> typeDeclaration) {
        return JavaParserFactory.toTypeDeclaration(typeDeclaration, typeSolver);
    }

    public ResolvedType classToResolvedType(Class<?> clazz) {
        if (clazz.isPrimitive()) {
            return ResolvedPrimitiveType.byName(clazz.getName());
        }

        ResolvedReferenceTypeDeclaration declaration;
        if (clazz.isAnnotation()) {
            declaration = new ReflectionAnnotationDeclaration(clazz, typeSolver);
        } else if (clazz.isEnum()) {
            declaration = new ReflectionEnumDeclaration(clazz, typeSolver);
        } else if (clazz.isInterface()) {
            declaration = new ReflectionInterfaceDeclaration(clazz, typeSolver);
        } else {
            declaration = new ReflectionClassDeclaration(clazz, typeSolver);
        }
        return new ReferenceTypeImpl(declaration, typeSolver);
    }

}
