/***************************************************************************
 *
 * PROJECT: The Dark Mod
 * $Revision$
 * $Date$
 * $Author$
 *
 ***************************************************************************/

#include "../idlib/precompiled.h"
#pragma hdrstop

static bool init_version = FileVersionList("$Id$", init_version);

#include "DownloadManager.h"

CDownloadManager::CDownloadManager() :
	_nextAvailableId(1),
	_allDownloadsDone(true)
{}

int CDownloadManager::AddDownload(const CDownloadPtr& download)
{
	int id = _nextAvailableId++;

	_downloads[id] = download;

	_allDownloadsDone = false;

	return id;
}

CDownloadPtr CDownloadManager::GetDownload(int id)
{
	Downloads::iterator found = _downloads.find(id);

	return (found != _downloads.end()) ? found->second : CDownloadPtr();
}

void CDownloadManager::ClearDownloads()
{
	_downloads.clear();
}

bool CDownloadManager::DownloadInProgress()
{
	for (Downloads::const_iterator i = _downloads.begin(); i != _downloads.end(); ++i)
	{
		if (i->second->GetStatus() == CDownload::IN_PROGRESS)
		{
			return true;
		}
	}

	return false;
}

void CDownloadManager::RemoveDownload(int id)
{
	Downloads::iterator found = _downloads.find(id);

	if (found != _downloads.end()) 
	{
		_downloads.erase(found);
	}
}

void CDownloadManager::ProcessDownloads()
{
	if (_allDownloadsDone || _downloads.empty()) 
	{
		return; // nothing to do
	}

	if (DownloadInProgress())
	{
		return; // download still in progress
	}

	// No download in progress, pick a new from the queue
	for (Downloads::const_iterator i = _downloads.begin(); i != _downloads.end(); ++i)
	{
		if (i->second->GetStatus() == CDownload::NOT_STARTED_YET)
		{
			i->second->Start();
			return;
		}
	}

	// No download left to handle
	_allDownloadsDone = true;
}