/*
 *	subtitleeditor -- a tool to create or edit subtitle
 *
 *	http://home.gna.org/subtitleeditor/
 *	https://gna.org/projects/subtitleeditor/
 *
 *	Copyright @ 2005-2009, kitone
 *
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation; either version 3 of the License, or
 *	(at your option) any later version.
 *
 *	This program is distributed in the hope that it will be useful,
 *	but WITHOUT ANY WARRANTY; without even the implied warranty of
 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *	GNU General Public License for more details.
 *
 *	You should have received a copy of the GNU General Public License
 *	along with this program. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "documentsystem.h"
#include "utility.h"

/*
 *
 */
DocumentSystem::DocumentSystem()
:m_currentDocument(NULL)
{
	se_debug(SE_DEBUG_APP);
}

/*
 *
 */
DocumentSystem::~DocumentSystem()
{
	se_debug(SE_DEBUG_APP);

	m_currentDocument = NULL;

	for(DocumentList::const_iterator it = m_listDocuments.begin(); 
			it!=m_listDocuments.end(); 
			++it)
	{
		delete *it;
	}

	m_listDocuments.clear();
}

/*
 *
 */
DocumentSystem& DocumentSystem::getInstance()
{
	static DocumentSystem instance;
	return instance;
}

/*
 *
 */
void DocumentSystem::append(Document *doc)
{
	se_debug(SE_DEBUG_APP);

	g_return_if_fail(doc);

	m_listDocuments.push_back(doc);

	m_signal_document_create(doc);
}

/*
 *
 */
void DocumentSystem::remove(Document *doc)
{
	se_debug(SE_DEBUG_APP);

	g_return_if_fail(doc);

	m_listDocuments.remove(doc);

	if(m_currentDocument == doc)
	{
		setCurrentDocument(NULL);
	}
	m_signal_document_delete(doc);

	delete doc;
	doc = NULL;
}

/*
 *
 */
sigc::signal<void, Document*>& DocumentSystem::signal_document_create()
{
	se_debug(SE_DEBUG_APP);
	return m_signal_document_create;
}

/*
 *
 */
sigc::signal<void, Document*>& DocumentSystem::signal_document_delete()
{
	se_debug(SE_DEBUG_APP);
	return m_signal_document_delete;
}


sigc::signal<void, Document*>& DocumentSystem::signal_current_document_changed()
{
	se_debug(SE_DEBUG_APP);
	return m_signal_current_document_changed;
}


/*
 *
 */
void DocumentSystem::setCurrentDocument(Document *doc)
{
	se_debug_message(SE_DEBUG_APP, "%s", ((doc == NULL) ? "NULL" : doc->getFilename().c_str()));

	//g_return_if_fail(doc);
	if(doc)
	{
		m_currentDocument = doc;
		m_signal_current_document_changed(doc);
	}
	else
	{
		m_currentDocument = NULL;
		m_signal_current_document_changed(NULL);
	}
}

/*
 *
 */
Document* DocumentSystem::getCurrentDocument()
{
	if(m_currentDocument == NULL)
	{
		//std::cerr << "DocumentSystem::getCurrentDocument == NULL" << std::endl;
		return NULL;
	}
	return m_currentDocument;
}

/*
 *
 */
DocumentList DocumentSystem::getAllDocuments()
{
	return m_listDocuments;
}

/*
 *
 */
Document* DocumentSystem::getDocument(const Glib::ustring &filename)
{
	se_debug_message(SE_DEBUG_APP, "filename = %s", filename.c_str());

	DocumentList::const_iterator it;
	for( it=m_listDocuments.begin(); it!=m_listDocuments.end(); ++it)
	{
		if((*it)->getFilename() == filename)
			return *it;
	}
	se_debug_message(SE_DEBUG_APP, "return NULL: FAILED");

	return NULL;
}

/*
 *	find a unique name (like "Untitled-5") for a new document
 */
Glib::ustring DocumentSystem::create_untitled_name()
{
	se_debug(SE_DEBUG_PLUGINS);

	const gchar *untitled = _("Untitled %d");

	unsigned int i=1;
		
	while(check_if_document_name_exist(build_message(untitled, i)))
	{
		++i;
	}
	return build_message(untitled, i);
}

/*
 *	check with other document if this name exist
 *	return true if it is
 */
bool DocumentSystem::check_if_document_name_exist(const Glib::ustring &name)
{
	se_debug(SE_DEBUG_PLUGINS);

	for(DocumentList::const_iterator it = m_listDocuments.begin(); it != m_listDocuments.end(); ++it)
	{
		if( name == (*it)->getName())
			return true;
	}

	return false;
}
