/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 */
package org.codehaus.groovy.ast;

import org.codehaus.groovy.ast.expr.DeclarationExpression;
import org.codehaus.groovy.ast.expr.Expression;
import org.codehaus.groovy.ast.stmt.AssertStatement;
import org.codehaus.groovy.ast.stmt.BlockStatement;
import org.codehaus.groovy.ast.stmt.BreakStatement;
import org.codehaus.groovy.ast.stmt.CaseStatement;
import org.codehaus.groovy.ast.stmt.CatchStatement;
import org.codehaus.groovy.ast.stmt.ContinueStatement;
import org.codehaus.groovy.ast.stmt.DoWhileStatement;
import org.codehaus.groovy.ast.stmt.ExpressionStatement;
import org.codehaus.groovy.ast.stmt.ForStatement;
import org.codehaus.groovy.ast.stmt.IfStatement;
import org.codehaus.groovy.ast.stmt.ReturnStatement;
import org.codehaus.groovy.ast.stmt.Statement;
import org.codehaus.groovy.ast.stmt.SwitchStatement;
import org.codehaus.groovy.ast.stmt.SynchronizedStatement;
import org.codehaus.groovy.ast.stmt.ThrowStatement;
import org.codehaus.groovy.ast.stmt.TryCatchStatement;
import org.codehaus.groovy.ast.stmt.WhileStatement;
import org.codehaus.groovy.control.SourceUnit;
import org.codehaus.groovy.control.messages.SyntaxErrorMessage;
import org.codehaus.groovy.syntax.SyntaxException;
import org.codehaus.groovy.transform.ErrorCollecting;

import java.util.List;
import java.util.Map;

public abstract class ClassCodeVisitorSupport extends CodeVisitorSupport implements ErrorCollecting, GroovyClassVisitor {

    public void visitClass(ClassNode node) {
        visitAnnotations(node);
        visitPackage(node.getPackage());
        visitImports(node.getModule());
        node.visitContents(this);
        visitObjectInitializerStatements(node);
    }
    
    protected void visitObjectInitializerStatements(ClassNode node) {
        for (Statement element : node.getObjectInitializerStatements()) {
            element.visit(this);
        }
    }

    public void visitPackage(PackageNode node) {
        if (node != null) {
            visitAnnotations(node);
            node.visit(this);
        }
    }

    public void visitImports(ModuleNode node) {
        if (node != null) {
            for (ImportNode importNode : node.getImports()) {
                visitAnnotations(importNode);
                importNode.visit(this);
            }
            for (ImportNode importStarNode : node.getStarImports()) {
                visitAnnotations(importStarNode);
                importStarNode.visit(this);
            }
            for (ImportNode importStaticNode : node.getStaticImports().values()) {
                visitAnnotations(importStaticNode);
                importStaticNode.visit(this);
            }
            for (ImportNode importStaticStarNode : node.getStaticStarImports().values()) {
                visitAnnotations(importStaticStarNode);
                importStaticStarNode.visit(this);
            }
        }
    }

    public void visitAnnotations(AnnotatedNode node) {
        List<AnnotationNode> annotations = node.getAnnotations();
        if (annotations.isEmpty()) return;
        for (AnnotationNode an : annotations) {
            // skip built-in properties
            if (an.isBuiltIn()) continue;
            for (Map.Entry<String, Expression> member : an.getMembers().entrySet()) {
                member.getValue().visit(this);
            }
        }
    }

    public void visitBlockStatement(BlockStatement block) {
        visitStatement(block);
        super.visitBlockStatement(block);
    }

    protected void visitClassCodeContainer(Statement code) {
        if (code != null) code.visit(this);
    }

    @Override
    public void visitDeclarationExpression(DeclarationExpression expression) {
        visitAnnotations(expression);
        super.visitDeclarationExpression(expression);
    }

    protected void visitConstructorOrMethod(MethodNode node, boolean isConstructor) {
        visitAnnotations(node);
        visitClassCodeContainer(node.getCode());
        for (Parameter param : node.getParameters()) {
            visitAnnotations(param);
        }
    }

    public void visitConstructor(ConstructorNode node) {
        visitConstructorOrMethod(node, true);
    }

    public void visitMethod(MethodNode node) {
        visitConstructorOrMethod(node, false);
    }

    public void visitField(FieldNode node) {
        visitAnnotations(node);
        Expression init = node.getInitialExpression();
        if (init != null) init.visit(this);
    }

    public void visitProperty(PropertyNode node) {
        visitAnnotations(node);
        Statement statement = node.getGetterBlock();
        visitClassCodeContainer(statement);

        statement = node.getSetterBlock();
        visitClassCodeContainer(statement);

        Expression init = node.getInitialExpression();
        if (init != null) init.visit(this);
    }

    public void addError(String msg, ASTNode expr) {
        SourceUnit source = getSourceUnit();
        source.getErrorCollector().addErrorAndContinue(
                new SyntaxErrorMessage(new SyntaxException(msg + '\n', expr.getLineNumber(), expr.getColumnNumber(), expr.getLastLineNumber(), expr.getLastColumnNumber()), source)
        );
    }

    protected abstract SourceUnit getSourceUnit();

    protected void visitStatement(Statement statement) {
    }

    public void visitAssertStatement(AssertStatement statement) {
        visitStatement(statement);
        super.visitAssertStatement(statement);
    }

    public void visitBreakStatement(BreakStatement statement) {
        visitStatement(statement);
        super.visitBreakStatement(statement);
    }

    public void visitCaseStatement(CaseStatement statement) {
        visitStatement(statement);
        super.visitCaseStatement(statement);
    }

    public void visitCatchStatement(CatchStatement statement) {
        visitStatement(statement);
        super.visitCatchStatement(statement);
    }

    public void visitContinueStatement(ContinueStatement statement) {
        visitStatement(statement);
        super.visitContinueStatement(statement);
    }

    public void visitDoWhileLoop(DoWhileStatement loop) {
        visitStatement(loop);
        super.visitDoWhileLoop(loop);
    }

    public void visitExpressionStatement(ExpressionStatement statement) {
        visitStatement(statement);
        super.visitExpressionStatement(statement);
    }

    public void visitForLoop(ForStatement forLoop) {
        visitStatement(forLoop);
        super.visitForLoop(forLoop);
    }

    public void visitIfElse(IfStatement ifElse) {
        visitStatement(ifElse);
        super.visitIfElse(ifElse);
    }

    public void visitReturnStatement(ReturnStatement statement) {
        visitStatement(statement);
        super.visitReturnStatement(statement);
    }

    public void visitSwitch(SwitchStatement statement) {
        visitStatement(statement);
        super.visitSwitch(statement);
    }

    public void visitSynchronizedStatement(SynchronizedStatement statement) {
        visitStatement(statement);
        super.visitSynchronizedStatement(statement);
    }

    public void visitThrowStatement(ThrowStatement statement) {
        visitStatement(statement);
        super.visitThrowStatement(statement);
    }

    public void visitTryCatchFinally(TryCatchStatement statement) {
        visitStatement(statement);
        super.visitTryCatchFinally(statement);
    }

    public void visitWhileLoop(WhileStatement loop) {
        visitStatement(loop);
        super.visitWhileLoop(loop);
    }
}
