/*
 * This file is a part of CMSLU -- Content Management System like Unix
 * and is not publicly distributed
 * 
 * Copyright (c) 2009, Tomasz Sowa
 * All rights reserved.
 * 
 */
 
#include "mounts.h"
#include "data.h"
#include "request.h"
#include "log.h"
#include "mountparser.h"
#include "db.h"



Mounts::Mounts()
{
	pmount = 0;
}



// reading from 'mounts'
Error Mounts::ReadMounts(const std::string & mounts)
{
	MountParser mp;
	Error err = mp.Parse(mounts, mount_tab);

	if( err != Error::ok )
	{
		log << log1 << "M: some problems with mountpoints (mountpoints table will be empty)" << logend;	
		mount_tab.clear();
	}

	CalcCurMount();

return err;
}



// reading from /etc/fstab
Error Mounts::ReadMounts()
{
	static std::string file = "fstab";

	Item * etc = data.dirs.GetEtcDir();

	if( !etc )
	{
		log << log1 << "M: there is no /etc directory" << logend;
		return Error::no_item;
	}

	Item fstab;
	Error err = db.GetItem(etc->id, file, fstab);

	if( err == Error::no_item )
	{
		log << log1 << "M: there is no /etc/fstab file" << logend;
		return err;
	}

	if( err != Error::ok )
	{
		log << log1 << "M: cannot read /etc/fstab" << logend;
		return err;
	}

	return ReadMounts(fstab.content);
}


void Mounts::MountCmsForRoot()
{
	Mount mount;
	mount.type = Mount::cms;
	mount.fs   = Mount::simplefs;

	Item * proot = data.dirs.GetRootDir();
	
	if( proot )
		mount.dir_id = proot->id;
	else
	{
		mount.dir_id = -1;
		log << log1 << "M: there is no a root dir" << logend;	
	}

	std::pair<MountTab::iterator, bool> res = mount_tab.insert( std::make_pair(mount.dir_id, mount) );
	pmount = &(res.first->second);
}




void Mounts::CalcCurMount()
{
std::vector<Item*>::reverse_iterator i;

	// when the program starts (when the dir_table is empty() 
	// we don't want to call MountCmsForRoot()
	if( request.dir_table.empty() )
		return;
	
	for(i = request.dir_table.rbegin() ; i!=request.dir_table.rend() ; ++i)
	{
		std::map<long, Mount>::iterator m = mount_tab.find( (*i)->id );
		
		if( m != mount_tab.end() )
		{
			pmount = &(m->second);
			log << log2 << "M: current mount point is: " << pmount->TypeToStr()
						<< ", fs: " << pmount->FsToStr() << logend;
			return;	
		}
	}

	// if nothing was found
	// we assume that 'cms' mount point is used
	MountCmsForRoot();
	log << log2 << "M: current mount point is: " << pmount->TypeToStr() << " (default)"
		<< ", fs: " << pmount->FsToStr() << logend;
}