/*
 *  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.stmt;

import org.codehaus.groovy.GroovyBugError;
import org.codehaus.groovy.ast.GroovyCodeVisitor;
import org.codehaus.groovy.ast.expr.DeclarationExpression;
import org.codehaus.groovy.ast.expr.Expression;
import org.codehaus.groovy.ast.expr.VariableExpression;

import java.util.ArrayList;
import java.util.List;

/**
 * Represents a try { ... } catch () finally {} statement in Groovy
 */
public class TryCatchStatement extends Statement {
    private static final String IS_RESOURCE = "_IS_RESOURCE";
    private Statement tryStatement;
    private final List<ExpressionStatement> resourceStatements = new ArrayList<>(4);
    private final List<CatchStatement> catchStatements = new ArrayList<>(4);
    private Statement finallyStatement;


    public TryCatchStatement(Statement tryStatement, Statement finallyStatement) {
        this.tryStatement = tryStatement;
        this.finallyStatement = finallyStatement;
    }

    @Override
    public void visit(GroovyCodeVisitor visitor) {
        visitor.visitTryCatchFinally(this);
    }

    public List<ExpressionStatement> getResourceStatements() {
        return resourceStatements;
    }

    public List<CatchStatement> getCatchStatements() {
        return catchStatements;
    }

    public Statement getFinallyStatement() {
        return finallyStatement;
    }

    public Statement getTryStatement() {
        return tryStatement;
    }

    public void addResource(ExpressionStatement resourceStatement) {
        Expression resourceExpression = resourceStatement.getExpression();
        if (!(resourceExpression instanceof DeclarationExpression || resourceExpression instanceof VariableExpression)) {
            throw new GroovyBugError("resourceStatement should be a variable declaration statement or a variable");
        }

        resourceExpression.putNodeMetaData(IS_RESOURCE, Boolean.TRUE);

        resourceStatements.add(resourceStatement);
    }

    public static boolean isResource(Expression expression) {
        Boolean r = expression.getNodeMetaData(IS_RESOURCE);
        return null != r && r;
    }

    public void addCatch(CatchStatement catchStatement) {
        catchStatements.add(catchStatement);
    }

    /**
     * @return the catch statement of the given index or null
     */
    public CatchStatement getCatchStatement(int idx) {
        if (idx >= 0 && idx < catchStatements.size()) {
            return catchStatements.get(idx);
        }
        return null;
    }

    /**
     * @return the resource statement of the given index or null
     */
    public ExpressionStatement getResourceStatement(int idx) {
        if (idx >= 0 && idx < resourceStatements.size()) {
            return resourceStatements.get(idx);
        }
        return null;
    }

    public void setTryStatement(Statement tryStatement) {
        this.tryStatement = tryStatement;
    }

    public void setCatchStatement(int idx, CatchStatement catchStatement) {
        catchStatements.set(idx, catchStatement);
    }

    public void setFinallyStatement(Statement finallyStatement) {
        this.finallyStatement = finallyStatement;
    }
}
