#include "BeatSequence.h"
#include <sstream>

namespace midi {

BeatSequence::BeatSequence()
    : BeatSequence(0)
{
}

BeatSequence::BeatSequence(BeatIndex size)
    : parent(size)
{
}

void BeatSequence::expand(BeatIndex factor)
{
    if(factor < 1) {
        throw "factor may not be less than 1."; 
    }

    resize(size() * factor);

    for(signed int targetIndex = (size() - factor); targetIndex > 0; targetIndex -= factor)
    {
        BeatIndex sourceIndex = targetIndex / factor;
        at(sourceIndex).swap(at(targetIndex));  
    }
}

void BeatSequence::print(std::ostream& stream) const
{
    stream << "beat sequence:\n";

    for(BeatIndex beatIndex = 0; beatIndex < size(); beatIndex++) {

        std::stringstream beatLabelStream;
        beatLabelStream << "beat #" << beatIndex << ": ";
        std::string beatLabel = beatLabelStream.str();
        stream << beatLabel;

        std::string spacer(beatLabel.size(), ' ');

        const MessageList& beat = at(beatIndex);
        if(beat.size() == 0) {
            stream << "no message" << "\n";
        } else {
            for(MessageList::const_iterator msg_it = beat.begin(); msg_it != beat.end(); msg_it++) {
                if(msg_it != beat.begin()) {
                    stream << spacer;
                }
                (*msg_it)->print(stream);
            }
        }

    }

    stream << "\n";
    stream.flush();
}

} // namepsace