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package com.sun.jersey.core.header;

import com.sun.jersey.core.header.reader.HttpHeaderReader;
import java.text.ParseException;
import javax.ws.rs.core.MediaType;
import java.util.Map;

/**
 * An quality source media type.
 *
 * @author [email protected]
 */
public class QualitySourceMediaType extends MediaType {

    public static final String QUALITY_SOURCE_FACTOR = "qs";

    public static final int DEFAULT_QUALITY_SOURCE_FACTOR = 1000;

    private final int qs;

    public QualitySourceMediaType(String p, String s) {
        super(p, s);
        qs = DEFAULT_QUALITY_SOURCE_FACTOR;
    }
    
    public QualitySourceMediaType(String p, String s, int qs, Map parameters) {
        super(p, s, parameters);
        this.qs = qs;
    }
        
    public QualitySourceMediaType(MediaType mt) {
        this(mt.getType(), mt.getSubtype(), getQs(mt), mt.getParameters());
    }

    public int getQualitySource() {
        return qs;
    }
    
    public static QualitySourceMediaType valueOf(HttpHeaderReader reader) throws ParseException {
        // Skip any white space
        reader.hasNext();

        // Get the type
        String type = reader.nextToken();
        reader.nextSeparator('/');
        // Get the subtype
        String subType = reader.nextToken();

        int qs = DEFAULT_QUALITY_SOURCE_FACTOR;
        Map parameters = null;
        if (reader.hasNext()) {
            parameters = HttpHeaderReader.readParameters(reader);
            if (parameters != null) {
                qs = getQs(parameters.get(QUALITY_SOURCE_FACTOR));
            }
        }

        return new QualitySourceMediaType(type, subType, qs, parameters);
    }

    public static int getQualitySource(MediaType mt) {
        if (mt instanceof QualitySourceMediaType) {
            QualitySourceMediaType qsmt = (QualitySourceMediaType)mt;
            return qsmt.getQualitySource();
        } else {
            return getQs(mt);
        }
    }
    
    private static int getQs(MediaType mt) {
        try {
            return getQs(mt.getParameters().get(QUALITY_SOURCE_FACTOR));
        } catch (ParseException ex) {
            throw new IllegalArgumentException(ex);
        }
    }

    private static int getQs(String v) throws ParseException {
        if (v == null)
            return DEFAULT_QUALITY_SOURCE_FACTOR;
        
        try {
            final int qs = (int)(Float.valueOf(v) * 1000.0);
            if (qs < 0)
                throw new ParseException("The quality source (qs) value, " + v + ", must be non-negative number", 0);
            return qs;
        } catch (NumberFormatException ex) {
            ParseException pe = new ParseException("The quality source (qs) value, " + v + ", is not a valid value", 0);
            pe.initCause(ex);
            throw pe;
        }
    }
}