/*
 * Copyright (C) 2020 Christian Pierre MOMON <christian@momon.org>
 * 
 * This file is part of StatoolInfos, simple service statistics tool.
 * 
 * StatoolInfos is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 * 
 * StatoolInfos is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with StatoolInfos.  If not, see <http://www.gnu.org/licenses/>.
 */
package fr.devinsy.statoolinfos;

import java.io.File;
import java.io.IOException;

import fr.devinsy.statoolinfos.core.Categories;
import fr.devinsy.statoolinfos.core.Configuration;
import fr.devinsy.statoolinfos.core.Factory;
import fr.devinsy.statoolinfos.core.Federation;
import fr.devinsy.statoolinfos.core.StatoolInfosException;
import fr.devinsy.statoolinfos.crawl.CrawlCache;

/**
 * The Class Manager.
 */
public class HtmlizerContext
{
    private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(HtmlizerContext.class);

    private static class SingletonHolder
    {
        private static final HtmlizerContext instance = new HtmlizerContext();
    }

    private Configuration configuration;
    private Federation federation;
    private Categories categories;
    private CrawlCache cache;

    /**
     * Instantiates a new manager.
     */
    private HtmlizerContext()
    {
    }

    /**
     * Configure.
     *
     * @param configurationFile
     *            the configuration file
     * @throws IOException
     * @throws StatoolInfosException
     */
    public void configure(final File configurationFile) throws StatoolInfosException, IOException
    {
        this.configuration = Factory.loadConfiguration(configurationFile);

        logger.info("Cache setting: {}", this.configuration.getCrawlCachePath());
        logger.info("Htmlize input setting: {}", this.configuration.getHtmlizeInputPath());
        logger.info("Htmlize directory setting: {}", this.configuration.getHtmlizeDirectoryPath());

        File htmlizeInput = this.configuration.getHtmlizeInput();
        File htmlizeDirectory = this.configuration.getHtmlizeDirectory();
        if (htmlizeInput == null)
        {
            throw new IllegalArgumentException("Htmlize input undefined.");
        }
        else if (!htmlizeInput.exists())
        {
            throw new IllegalArgumentException("Htmlize input is missing.");
        }
        else if (htmlizeInput.isDirectory())
        {
            throw new IllegalArgumentException("Htmlize input is a directory.");
        }
        else if (htmlizeDirectory == null)
        {
            throw new IllegalArgumentException("Htmlize directory undefined.");
        }
        else if (!htmlizeDirectory.exists())
        {
            throw new IllegalArgumentException("Htmlize directory is missing.");
        }
        else if (!htmlizeDirectory.isDirectory())
        {
            throw new IllegalArgumentException("Htmlize directory is not a directory.");
        }
        else
        {
            if (this.configuration.isFederation())
            {
                this.cache = this.configuration.getCrawlCache();
                this.federation = Factory.loadFederation(this.configuration.getHtmlizeInput(), this.cache);
                this.categories = Factory.loadCategories(this.configuration.getCategoryFile(), this.federation);
            }
            else
            {
                throw new IllegalArgumentException("Not a federation configuration.");
            }
        }
    }

    /**
     * Gets the cache.
     *
     * @return the cache
     */
    public CrawlCache getCache()
    {
        CrawlCache result;

        result = this.cache;

        //
        return result;
    }

    /**
     * Gets the categories.
     *
     * @return the categories
     */
    public Categories getCategories()
    {
        Categories result;

        result = this.categories;

        //
        return result;
    }

    /**
     * Gets the configuration.
     *
     * @return the configuration
     */
    public Configuration getConfiguration()
    {
        Configuration result;

        result = this.configuration;

        //
        return result;
    }

    /**
     * Gets the federation.
     *
     * @return the federation
     */
    public Federation getFederation()
    {
        Federation result;

        result = this.federation;

        //
        return result;
    }

    /**
     * Htmlize directory.
     *
     * @return the file
     */
    public File getHtmlizeDirectory()
    {
        File result;

        result = this.configuration.getHtmlizeDirectory();

        //
        return result;
    }

    /**
     * Instance.
     *
     * @return the manager
     */
    public static HtmlizerContext instance()
    {
        return SingletonHolder.instance;
    }
}