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/*
 * Copyright 2012 AMG.lab, a Bull Group Company
 * 
 * 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 org.xlcloud.service.parsers;

import static org.xlcloud.service.heat.template.commons.HeatTemplateValueBuilder.fnJoin;
import static org.xlcloud.service.heat.template.commons.HeatTemplateValueBuilder.string;

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

import org.apache.commons.lang.StringUtils;
import org.json.JSONException;
import org.xlcloud.rest.exception.ValidationException;
import org.xlcloud.rest.exception.ValidationException.ValidationFailureType;
import org.xlcloud.service.ChefCookbook;
import org.xlcloud.service.ChefFile;
import org.xlcloud.service.heat.template.commons.HeatTemplateValue;
import org.xlcloud.service.heat.template.commons.HeatTemplateValueBuilder;
import org.xlcloud.service.heat.template.commons.StringHeatTemplateValue;
import org.xlcloud.service.heat.template.commons.functions.FnJoin;

/**
 * Parser for {@link ChefFile} based on {@link HeatTemplateValue}
 * 
 * @author Michał Kamiński, AMG.net
 */
public class ChefFileParser {

    public HeatTemplateValue fromCheffile(ChefFile cheffile) throws JSONException {
        List fnJoinValues = new ArrayList<>();
        fnJoinValues.add(string("#!/usr/bin/env ruby"));
        fnJoinValues.add(string("site 'http://community.opscode.com/api/v1'"));

        if (cheffile != null) {
            for (ChefCookbook cookbook : cheffile.getCookbooks()) {
                fnJoinValues.add(string("cookbook '" + cookbook.getCookbook() + "'"));
                if (StringUtils.isNotBlank(cookbook.getGit())) {
                    fnJoinValues.add(string("    :git => '" + cookbook.getGit() + "',"));
                }
                fnJoinValues.add(string("    :path => '" + cookbook.getCookbook() + "'"));
            }
        }
        
        return fnJoin("\n", fnJoinValues.toArray(new HeatTemplateValue[fnJoinValues.size()]));
    }

    public ChefFile toChefFile(HeatTemplateValue value) throws JSONException {
        if (value instanceof StringHeatTemplateValue) {
            return fromString((StringHeatTemplateValue) value);
        } else if (value instanceof FnJoin) {
            return fromFnJoin((FnJoin) value);
        } else {
            throw new ValidationException("format: " + value.getClass() + " is not supported", ValidationFailureType.CHEFFILE_FORMAT);
        }
    }

    private ChefFile fromFnJoin(FnJoin fnJoin) throws JSONException {
        String delimiter = fnJoin.getDelimiter();
        List values = fnJoin.getContent();
        List stringValues = new ArrayList<>();
        for (HeatTemplateValue fnJoinValue : values) {
            stringValues.add(fnJoinValue.get().toString());
        }
        String stringRepresentation = StringUtils.join(stringValues, delimiter);
        return fromString(HeatTemplateValueBuilder.string(stringRepresentation));
    }

    private ChefFile fromString(StringHeatTemplateValue value) {
        ChefFile chefFile = new ChefFile();
        String[] lines = StringUtils.split(value.get(), "\n");
        ChefCookbook cookbook = null;
        for (String line : lines) {
            line = StringUtils.trim(line);
            if (line.startsWith("cookbook")) {
                if (cookbook != null) {
                    chefFile.getCookbooks().add(cookbook);
                }
                cookbook = new ChefCookbook();
                cookbook.setCookbook(StringUtils.substringBetween(line, "'", "'"));
            }
            if (line.startsWith(":git")) {
                cookbook.setGit(StringUtils.substringBetween(line, "'", "'"));
            }
        }
        if (cookbook != null) {
            chefFile.getCookbooks().add(cookbook);
        }
        return chefFile;
    }

}