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package cfa.vo.vomodel;

import cfa.vo.vomodel.table.ModelTable;
import cfa.vo.vomodel.table.ModelTableBuilder;

import java.io.IOException;
import java.net.URL;
import java.util.HashMap;
import java.util.Map;

/**
 *
 * @author mdittmar
 */
public class DefaultModelBuilder extends AbstractModelBuilder {
    
    // Keep store of which models are supported, and by which method.
    private HashMap<String, String> supported;
    private String modelName;
    private Map<Entry, Entry> overrides = new HashMap();
    public static final String DEFAULT_MODEL_NAME = "SPECTRUM-2.0";
    
    public DefaultModelBuilder(String modelName)
    {
        this.modelName = modelName;
        supported = new HashMap();
        supported.put("SPECTRUM-2.0","Table");
    }

    public DefaultModelBuilder overrideEntries(Map<Entry, Entry> overrides) {
        this.overrides = overrides;
        return this;
    }
    
    /**
     * Constructor to generate an Object pre-loaded with the specified 
     * VO Data Model definition.
     *
     * @throws IllegalArgumentException if model name is not recognized.
     * @throws IOException on problem loading model definition.
     * @return Model interface to Object.
     */
    public Model build() throws IOException
    {
        Model model;
        String key = modelName.toUpperCase();
        URL file;
        
        if (! this.supported.containsKey( key ) )
            throw new IllegalArgumentException("Invalid or unrecognized Model name.");

        if ( this.supported.get(key).equals("Table"))
        {
            model = load_table( key );
        }
        else
            model = null;

        return model;
    }

    private Model load_table( String modelName ) throws IOException
    {
        ModelTable model;
        String resourceFile;
        URL resourceURL;

//        boolean fail=false;
        
        if ( modelName.equals("SPECTRUM-1.03") )
        {
            resourceFile = "/spectrum_1p03.txt";
        }
        else if ( modelName.equals( "SPECTRUM-2.0" ) )
        {
            resourceFile = "/spectrum_2p0.txt";
        }
        else if ( modelName.equals("PHOTOMETRYPOINT-1.0") )
        {
            resourceFile = "/photometrypoint_1p0.txt";
        }
        else
            throw new IllegalArgumentException("Invalid or unrecognized Model name.");

        try {
            resourceURL = DefaultModelBuilder.class.getResource(resourceFile);
            model = (ModelTable) new ModelTableBuilder(resourceURL)
                    .overrideEntries(overrides)
                    .withModelData(getModelData())
                    .build();
        }
        catch( IOException e )
        {
            throw e;
        }

        return( model );
    }
    
}