/*

Copyright 2010,2013 Google Inc. and other contributors
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    * Redistributions in binary form must reproduce the above
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contributors may be used to endorse or promote products derived from
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LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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*/

package com.google.refine.model.recon;

import java.io.IOException;
import java.io.Writer;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonTypeInfo;
import com.fasterxml.jackson.databind.annotation.JsonTypeIdResolver;
import com.google.refine.model.Cell;
import com.google.refine.model.Project;
import com.google.refine.model.Recon;
import com.google.refine.model.Row;
import com.google.refine.util.ParsingUtilities;

import edu.mit.simile.butterfly.ButterflyModule;

@JsonTypeInfo(
    use=JsonTypeInfo.Id.CUSTOM,
    include=JsonTypeInfo.As.PROPERTY,
    property="mode")
@JsonTypeIdResolver(ReconConfigResolver.class)
abstract public class ReconConfig  {
    final static protected Logger LOGGER = LoggerFactory.getLogger("recon-config");

    static final public Map<String, List<Class<? extends ReconConfig>>> s_opNameToClass =
        new HashMap<String, List<Class<? extends ReconConfig>>>();
    
    static final public Map<Class<? extends ReconConfig>, String> s_opClassToName =
        new HashMap<Class<? extends ReconConfig>, String>();
    
    static public void registerReconConfig(ButterflyModule module, String name, Class<? extends ReconConfig> klass) {
        String key = module.getName() + "/" + name;
        
        s_opClassToName.put(klass, key);
        
        List<Class<? extends ReconConfig>> classes = s_opNameToClass.get(key);
        if (classes == null) {
            classes = new LinkedList<Class<? extends ReconConfig>>();
            s_opNameToClass.put(key, classes);
        }
        classes.add(klass);
    }
    
    static public Class<? extends ReconConfig> getClassFromMode(String mode) {
        // Backward compatibility
        if ("extend".equals(mode) || "strict".equals(mode)) {
            mode = "freebase/" + mode;
        } else if ("heuristic".equals(mode)) {
            mode = "core/standard-service"; // legacy
        } else if (!mode.contains("/")) {
            mode = "core/" + mode;
        }
        
        // TODO: This can fail silently if the Freebase extension is not installed.
        List<Class<? extends ReconConfig>> classes = s_opNameToClass.get(mode);
        if (classes != null && classes.size() > 0) {
            return classes.get(classes.size() - 1);
        }
        return null;
    }
    
    static public ReconConfig reconstruct(String json) throws Exception {
        return ParsingUtilities.mapper.readValue(json, ReconConfig.class);
    }
    
    abstract public int getBatchSize();
    
    abstract public String getBriefDescription(Project project, String columnName);
    
    abstract public ReconJob createJob(
        Project     project, 
        int         rowIndex, 
        Row         row,
        String      columnName,
        Cell        cell
    );
    
    abstract public List<Recon> batchRecon(List<ReconJob> jobs, long historyEntryID);
    
    abstract public Recon createNewRecon(long historyEntryID);
    
    public void save(Writer writer) {
        try {
            ParsingUtilities.defaultWriter.writeValue(writer, this);
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    
    /**
     * Returns the identifier for the reconciliation mode, as serialized in JSON.
     * This is the same identifier that was used to register the registration mode.
     * Jackson already adds the mode during serialization hence the JsonIgnore here.
     */
    @JsonIgnore
    abstract public String getMode();
}
