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/**
 * Copyright 2012 Lyncode
 *
 * Licensed 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 com.lyncode.jtwig.tree.content;

import com.lyncode.jtwig.JtwigContext;
import com.lyncode.jtwig.exception.CalculateException;
import com.lyncode.jtwig.exception.CompileException;
import com.lyncode.jtwig.exception.RenderException;
import com.lyncode.jtwig.resource.JtwigResource;
import com.lyncode.jtwig.tree.api.Content;
import com.lyncode.jtwig.tree.api.Expression;
import com.lyncode.jtwig.tree.structural.Block;

import java.io.OutputStream;
import java.util.ArrayList;
import java.util.List;

import static com.lyncode.jtwig.util.BooleanOperations.isTrue;

public class IfExpression implements Content {
    private Expression conditionalExpression;
    private Content content;
    private ElseExpression elseExpression = null;
    private List elseIfExpressions = new ArrayList();

    public IfExpression(Expression conditionalExpression) {
        this.conditionalExpression = conditionalExpression;
    }

    public boolean setElseExpression(ElseExpression elseExpression) {
        this.elseExpression = elseExpression;
        return true;
    }

    public boolean addElseIf (ElseIfExpression expression) {
        this.elseIfExpressions.add(expression);
        return true;
    }

    public boolean setContent(Content content) {
        this.content = content;
        return true;
    }

    @Override
    public boolean render(OutputStream outputStream, JtwigContext context) throws RenderException {
        try {
            if (isTrue(conditionalExpression.calculate(context))) {
                return content.render(outputStream, context);
            } else {
                for (ElseIfExpression exp : elseIfExpressions) {
                    if (exp.render(outputStream, context))
                        return true;
                }
                if (elseExpression != null) {
                    return elseExpression.render(outputStream, context);
                }
                return true;
            }
        } catch (CalculateException e) {
            throw new RenderException(e);
        }
    }

    @Override
    public IfExpression compile(JtwigResource resource) throws CompileException {
        this.content = content.compile(resource);
        for (int i = 0;i