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/*
 * Copyright 2015 The original authors.
 *
 *    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 io.sundr.codegen.directives;

import io.sundr.codegen.model.TypeDef;
import org.apache.velocity.context.InternalContextAdapter;
import org.apache.velocity.runtime.directive.Directive;
import org.apache.velocity.runtime.parser.node.ASTBlock;
import org.apache.velocity.runtime.parser.node.Node;

import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;

public class ClassDirective extends Directive {
    
    
    private static final String MEMBER_OF = "MEMBER_OF";
    private static final String ABSTRACT = " abstract ";
    private static final String STATIC = " static ";
    private static final String FINAL = " final ";
    private static final String EXTENDS = " extends ";
    private static final String IMPLEMENTS = " implements ";
    private static final String PUBLIC = "public ";
    private static final String CLASS = "class";
    private static final String SPACE = " ";
    private static final String COMMA = ",";
    private static final String NEWLINE = "\n";
    private static final String BRACKETS_LR = "[]";

    private static final String SQUIGGLE_L = "{";
    private static final String SQUIGGLE_R = "}";

    private static final String LT = "<";
    private static final String GT = ">";


    @Override
    public String getName() {
        return CLASS;
    }

    @Override
    public int getType() {
        return BLOCK;
    }

    @Override
    public boolean render(InternalContextAdapter context, Writer writer, Node node) throws IOException {
        String block = "";
        TypeDef clazz = null;
        for (int i = 0; i < node.jjtGetNumChildren(); i++) {
            if (node.jjtGetChild(i) != null) {
                if (!(node.jjtGetChild(i) instanceof ASTBlock)) {
                    //reading and casting inline parameters
                    if (i == 0) {
                        clazz = (TypeDef) node.jjtGetChild(i).value(context);
                    } else {
                        break;
                    }
                } else {
                    //reading block content and rendering it
                    try {
                        StringWriter blockContent = new StringWriter();
                        node.jjtGetChild(i).render(context, blockContent);

                        block = blockContent.toString();
                    } catch (Exception e)  {
                        e.printStackTrace();
                    }
                    break;
                }
            }
        }
        writeClazz(writer, clazz, block);
        return true;
    }

    private void writeClazz(Writer writer, TypeDef type, String block) throws IOException {
        if (type != null) {
            writer.append(type.toString());
            writer.append(SQUIGGLE_L).append(NEWLINE);
            writer.append(block).append(NEWLINE).append(SQUIGGLE_R).append(NEWLINE);
        }
    }
}