/*
 * LensKit, an open source recommender systems toolkit.
 * Copyright 2010-2013 Regents of the University of Minnesota and contributors
 * Work on LensKit has been funded by the National Science Foundation under
 * grants IIS 05-34939, 08-08692, 08-12148, and 10-17697.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as
 * published by the Free Software Foundation; either version 2.1 of the
 * License, or (at your option) any later version.
 *
 * This program 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 General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 */
package org.grouplens.lenskit.eval.algorithm;

import com.google.common.base.Preconditions;
import org.apache.commons.lang3.builder.Builder;
import org.grouplens.lenskit.config.ConfigurationLoader;
import org.grouplens.lenskit.config.LenskitConfigScript;
import org.grouplens.lenskit.core.LenskitConfiguration;
import org.grouplens.lenskit.core.RecommenderConfigurationException;
import org.grouplens.lenskit.eval.EvalProject;
import org.grouplens.lenskit.eval.script.ConfigDelegate;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.annotation.Nonnull;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;

/**
 * Command to get a algorithmInfo instances.
 *
 * @author <a href="http://www.grouplens.org">GroupLens Research</a>
 */
@ConfigDelegate(AlgorithmInstanceBuilderDelegate.class)
public class AlgorithmInstanceBuilder implements Builder<AlgorithmInstance> {
    private static final Logger logger = LoggerFactory.getLogger(AlgorithmInstanceBuilder.class);
    private final LenskitConfiguration config;
    private String name;
    private Map<String, Object> attributes = new HashMap<String, Object>();
    private boolean preload;
    private EvalProject project;

    public AlgorithmInstanceBuilder() {
        this("Unnamed Algorithm");
    }

    public AlgorithmInstanceBuilder(String name) {
        this.name = name;
        config = new LenskitConfiguration();
    }

    /**
     * Set the algorithmInfo name.
     *
     * @param n The name for this algorithmInfo instance.
     * @return The command for chaining.
     */
    public AlgorithmInstanceBuilder setName(String n) {
        name = n;
        return this;
    }

    /**
     * Get the algorithmInfo name.
     *
     * @return The algortihm name.
     */
    public String getName() {
        return name;
    }

    /**
     * Get whether this algorithmInfo will require ratings to be pre-loaded.
     *
     * @return {@code true} if the algorithmInfo should have ratings pre-loaded into memory.
     */
    public boolean getPreload() {
        return preload;
    }

    /**
     * Get the project of this algorithmInfo
     * 
     * @return The project
     */
    public EvalProject getProject() {
        return project;
    }
    
    /**
     * Set whether the algorithmInfo wants ratings pre-loaded. Use this for algorithms that
     * are too slow reading on a CSV file if you have enough memory to load them all.
     *
     * @param pl {@code true} to pre-load input data when running this algorithmInfo.
     * @return The command for chaining.
     */
    public AlgorithmInstanceBuilder setPreload(boolean pl) {
        preload = pl;
        return this;
    }

    /**
     * Set an attribute for this algorithmInfo instance. Used for distinguishing similar
     * instances in an algorithmInfo family.
     *
     * @param attr  The attribute name.
     * @param value The attribute value.
     * @return The command for chaining.
     */
    public AlgorithmInstanceBuilder setAttribute(@Nonnull String attr, @Nonnull Object value) {
        Preconditions.checkNotNull(attr, "attribute names cannot be null");
        Preconditions.checkNotNull(value, "attribute values cannot be null");
        attributes.put(attr, value);
        return this;
    }

    /**
     * Set the project of Algorithm.
     * 
     * @param prj The project for this algorithmInfo.
     * @return The command for chaining.
     */
    public AlgorithmInstanceBuilder setProject(EvalProject prj) {
        project = prj;
        return this;        
    }

    /**
     * Get the attributes of this algorithmInfo instance.
     *
     * @return A map of user-defined attributes for this algorithmInfo instance.
     */
    public Map<String, Object> getAttributes() {
        return attributes;
    }

    public LenskitConfiguration getConfig() {
        return config;
    }

    /**
     * Configure the algorithmInfo instance builder from a file.
     * @param attributes The attributes.  Attributes 'name' and 'preload' are mapped to their
     *                   corresponding real properties.
     * @param file The file.
     * @return The builder (for chaining).
     * @throws RecommenderConfigurationException If there is an error running the script.
     * @throws IOException If there is an error loading the script.
     */
    public AlgorithmInstanceBuilder configureFromFile(Map<String,Object> attributes, File file) throws RecommenderConfigurationException, IOException {
        if (attributes.containsKey("name")) {
            setName(attributes.get("name").toString());
        } else {
            setName(file.getName().replaceAll("\\.groovy$", ""));
        }
        if (attributes.containsKey("preload")) {
            setPreload((Boolean) attributes.get("preload"));
        }
        for (Map.Entry<String,Object> attr: attributes.entrySet()) {
            String name = attr.getKey();
            if (!name.equals("name") && !name.equals("preload")) {
                setAttribute(name, attr.getValue());
            }
        }
        // FIXME Use the correct class loader
        ConfigurationLoader loader = new ConfigurationLoader();
        LenskitConfigScript script = loader.loadScript(file);
        script.configure(getConfig());
        return this;
    }

    @Override
    public AlgorithmInstance build() {
        AlgorithmInstance instance = new AlgorithmInstance(getName(), config, attributes, preload);
        if (project != null) {
            logger.warn("no project set");
            instance.setRandom(project.getRandom());
        }
        return instance;
    }
}

@@ -6543,89 +6543,106 @@
     
-logger.warn(%22no project set%22);%0A            instance.setRandom(project.getRandom()
+instance.setRandom(project.getRandom());%0A        %7D else %7B%0A            logger.warn(%22no project set%22
 );%0A 

Fix algorithm instance warning (closes #468)