+/* $Id$
+
+This file is part of R²C²
+Copyright © 2006-2010 Mikkosoft Productions, Mikko Rasa
+Distributed under the GPL
+*/
+
+#include <algorithm>
+#include "block.h"
+#include "layout.h"
+#include "route.h"
+#include "trackiter.h"
+#include "tracktype.h"
+
+using namespace std;
+using namespace Msp;
+
+namespace R2C2 {
+
+Block::Block(Layout &l, Track &start):
+ layout(l),
+ id(0),
+ sensor_id(start.get_sensor_id()),
+ turnout_id(start.get_turnout_id()),
+ train(0)
+{
+ tracks.insert(&start);
+ start.set_block(this);
+
+ list<Track *> queue;
+ queue.push_back(&start);
+
+ while(!queue.empty())
+ {
+ Track *track = queue.front();
+ queue.erase(queue.begin());
+
+ const vector<Track *> &links = track->get_links();
+ for(unsigned i=0; i<links.size(); ++i)
+ if(links[i] && !tracks.count(links[i]))
+ {
+ if(links[i]->get_sensor_id()==sensor_id && links[i]->get_turnout_id()==turnout_id)
+ {
+ queue.push_back(links[i]);
+ tracks.insert(links[i]);
+ links[i]->set_block(this);
+ }
+ else
+ endpoints.push_back(Endpoint(track, i));
+ }
+ }
+
+ determine_id();
+
+ for(unsigned i=0; i<endpoints.size(); ++i)
+ {
+ unsigned path = 1<<i;
+ endpoints[i].paths |= path;
+ find_paths(TrackIter(endpoints[i].track, endpoints[i].track_ep), path);
+ }
+
+ layout.add_block(*this);
+}
+
+Block::~Block()
+{
+ set<Track *> trks = tracks;
+ tracks.clear();
+ for(set<Track *>::iterator i=trks.begin(); i!=trks.end(); ++i)
+ (*i)->set_block(0);
+
+ for(vector<Endpoint>::iterator i=endpoints.begin(); i!=endpoints.end(); ++i)
+ if(Block *blk = i->link)
+ {
+ i->link = 0;
+ blk->break_link(*this);
+ }
+
+ layout.remove_block(*this);
+}
+
+bool Block::has_track(Track &t) const
+{
+ return tracks.count(&t);
+}
+
+const Block::Endpoint &Block::get_endpoint(unsigned i) const
+{
+ if(i>=endpoints.size())
+ throw InvalidParameterValue("Endpoint index out of range");
+
+ return endpoints[i];
+}
+
+int Block::get_endpoint_by_link(Block &other) const
+{
+ for(unsigned i=0; i<endpoints.size(); ++i)
+ if(endpoints[i].link==&other)
+ return i;
+
+ return -1;
+}
+
+float Block::get_path_length(unsigned entry, const Route *route) const
+{
+ if(entry>=endpoints.size())
+ throw InvalidParameterValue("Endpoint index out of range");
+
+ TrackIter t_iter(endpoints[entry].track, endpoints[entry].track_ep);
+
+ float result = 0;
+ while(t_iter && has_track(*t_iter))
+ {
+ unsigned path = (route ? route->get_path(*t_iter) : t_iter->get_active_path());
+ result += t_iter->get_type().get_path_length(path);
+
+ t_iter = t_iter.next(path);
+ }
+
+ return result;
+}
+
+void Block::check_link(Block &other)
+{
+ for(vector<Endpoint>::iterator i=endpoints.begin(); i!=endpoints.end(); ++i)
+ {
+ if(i->link)
+ continue;
+
+ for(vector<Endpoint>::iterator j=other.endpoints.begin(); j!=other.endpoints.end(); ++j)
+ if(j->track==i->track->get_link(i->track_ep) && j->track->get_link(j->track_ep)==i->track && !j->link)
+ {
+ i->link = &other;
+ j->link = this;
+
+ determine_id();
+ other.determine_id();
+ }
+ }
+}
+
+void Block::break_link(Block &other)
+{
+ for(vector<Endpoint>::iterator i=endpoints.begin(); i!=endpoints.end(); ++i)
+ if(i->link==&other)
+ {
+ i->link = 0;
+ other.break_link(*this);
+ determine_id();
+ }
+}
+
+Block *Block::get_link(unsigned epi) const
+{
+ if(epi>=endpoints.size())
+ throw InvalidParameterValue("Endpoint index out of range");
+ return endpoints[epi].link;
+}
+
+bool Block::reserve(Train *t)
+{
+ if(!t || !train)
+ {
+ train = t;
+ layout.signal_block_reserved.emit(*this, train);
+ return true;
+ }
+ else
+ return false;
+}
+
+void Block::find_paths(TrackIter track, unsigned path)
+{
+ unsigned mask = track.endpoint().paths;
+ for(unsigned i=0; mask>>i; ++i)
+ if(mask&(1<<i))
+ {
+ TrackIter next = track.next(i);
+ if(!next)
+ continue;
+ else if(has_track(*next))
+ find_paths(track.next(i), path);
+ else
+ {
+ next = next.flip();
+ for(vector<Endpoint>::iterator j=endpoints.begin(); j!=endpoints.end(); ++j)
+ if(j->track==next.track() && j->track_ep==next.entry())
+ j->paths |= path;
+ }
+ }
+}
+
+void Block::determine_id()
+{
+ if(sensor_id)
+ id = 0x1000|sensor_id;
+ else if(turnout_id)
+ id = 0x2000|turnout_id;
+ else if(endpoints.size()==2)
+ {
+ unsigned id1 = endpoints[0].link ? endpoints[0].link->get_id() : 1;
+ unsigned id2 = endpoints[1].link ? endpoints[1].link->get_id() : 1;
+ if(id2<id1)
+ swap(id1, id2);
+ id = (id1<<16)|id2;
+ }
+ else if(endpoints.size()==1)
+ {
+ unsigned id1 = endpoints[0].link ? endpoints[0].link->get_id() : 1;
+ id = 0x10000 | id1;
+ }
+}
+
+
+Block::Endpoint::Endpoint(Track *t, unsigned e):
+ track(t),
+ track_ep(e),
+ link(0),
+ paths(0)
+{ }
+
+} // namespace R2C2