/*
 * Copyright (C) 2013-2024 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.contexts;

import com.github.javaparser.ast.expr.InstanceOfExpr;
import com.github.javaparser.ast.expr.PatternExpr;
import com.github.javaparser.ast.expr.TypePatternExpr;
import com.github.javaparser.resolution.Context;
import com.github.javaparser.resolution.TypeSolver;
import com.github.javaparser.resolution.declarations.ResolvedValueDeclaration;
import com.github.javaparser.resolution.model.SymbolReference;
import com.github.javaparser.symbolsolver.javaparsermodel.declarations.JavaParserSymbolDeclaration;
import com.github.javaparser.symbolsolver.javaparsermodel.declarations.JavaParserTypePatternDeclaration;
import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

/**
 * @author Roger Howell
 */
public class InstanceOfExprContext extends AbstractJavaParserContext<InstanceOfExpr> {

    public InstanceOfExprContext(InstanceOfExpr wrappedNode, TypeSolver typeSolver) {
        super(wrappedNode, typeSolver);
    }

    @Override
    public SymbolReference<? extends ResolvedValueDeclaration> solveSymbol(String name) {
        // TODO: Add PatternExprContext and solve in that
        Optional<PatternExpr> optionalPatternExpr = wrappedNode.getPattern();
        if (optionalPatternExpr.isPresent() && (optionalPatternExpr.get().isTypePatternExpr())) {
            TypePatternExpr typePatternExpr = optionalPatternExpr.get().asTypePatternExpr();
            if (typePatternExpr.getNameAsString().equals(name)) {
                JavaParserTypePatternDeclaration decl =
                        JavaParserSymbolDeclaration.patternVar(typePatternExpr, typeSolver);
                return SymbolReference.solved(decl);
            }
        }

        Optional<Context> optionalParentContext = getParent();
        if (!optionalParentContext.isPresent()) {
            return SymbolReference.unsolved();
        }

        Context parentContext = optionalParentContext.get();
        if (parentContext instanceof BinaryExprContext) {
            Optional<TypePatternExpr> optionalPatternExpr1 = parentContext.typePatternExprInScope(name);
            if (optionalPatternExpr1.isPresent() && (optionalPatternExpr1.get().isTypePatternExpr())) {
                TypePatternExpr typePatternExpr = optionalPatternExpr1.get().asTypePatternExpr();
                JavaParserTypePatternDeclaration decl =
                        JavaParserSymbolDeclaration.patternVar(typePatternExpr, typeSolver);
                return SymbolReference.solved(decl);
            }
        } // TODO: Also consider unary expr context

        // if nothing is found we should ask the parent context
        return solveSymbolInParentContext(name);
    }

    @Override
    public List<TypePatternExpr> typePatternExprsExposedFromChildren() {
        List<TypePatternExpr> results = new ArrayList<>();

        // If this instanceof expression has a pattern, add it to the list.
        wrappedNode
                .getPattern()
                .ifPresent(patternExpr -> results.addAll(typePatternExprsDiscoveredInPattern(patternExpr)));

        return results;
    }
}
