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package org.yamcs.parameterarchive;

import java.nio.ByteBuffer;

import org.yamcs.parameter.Value;
import org.yamcs.parameter.ValueArray;
import org.yamcs.utils.DecodingException;
import org.yamcs.utils.DoubleArray;
import org.yamcs.utils.ValueUtility;
import org.yamcs.utils.VarIntUtil;

public class DoubleValueSegment extends BaseSegment implements ValueSegment {
    final static byte SUBFORMAT_ID_RAW = 0;

    DoubleArray values;

    DoubleValueSegment() {
        super(FORMAT_ID_DoubleValueSegment);
        values = new DoubleArray();
    }

    @Override
    public void insert(int pos, Value value) {
        values.add(pos, value.getDoubleValue());
    }

    @Override
    public void add(Value value) {
        values.add(value.getDoubleValue());
    }

    @Override
    public void writeTo(ByteBuffer bb) {
        bb.put(SUBFORMAT_ID_RAW);
        int n = values.size();
        VarIntUtil.writeVarInt32(bb, n);
        for (int i = 0; i < n; i++) {
            bb.putDouble(values.get(i));
        }
    }

    private void parse(ByteBuffer bb) throws DecodingException {
        byte fid = bb.get();
        if (fid != SUBFORMAT_ID_RAW) {
            throw new DecodingException("Uknown sub format id: " + fid);
        }
        int n = VarIntUtil.readVarInt32(bb);
        values = new DoubleArray(n);

        for (int i = 0; i < n; i++) {
            values.add(bb.getDouble());
        }
    }

    public static DoubleValueSegment parseFrom(ByteBuffer bb) throws DecodingException {
        DoubleValueSegment r = new DoubleValueSegment();
        r.parse(bb);
        return r;
    }

    @Override
    public Value getValue(int index) {
        return ValueUtility.getDoubleValue(values.get(index));
    }

    @Override
    public int getMaxSerializedSize() {
        return 4 + 8 * values.size();
    }

    @Override
    public ValueArray getRange(int posStart, int posStop, boolean ascending) {
        double[] r = new double[posStop - posStart];
        if (ascending) {
            for (int i = posStart; i < posStop; i++) {
                r[i - posStart] = values.get(i);
            }
        } else {
            for (int i = posStop; i > posStart; i--) {
                r[posStop - i] = values.get(i);
            }
        }

        return new ValueArray(r);
    }

    @Override
    public int size() {
        return values.size();
    }
}