/*
    Copyright (C) 20002 Paul Davis 

    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 2 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, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include <list>
#include <cerrno>

#include <ardour/ardour.h>
#include <ardour/session.h>
#include <ardour/tempo.h>
#include <ardour/io.h>

#include <sndfile.h>

#include "i18n.h"

using namespace std;
using namespace ARDOUR;
using namespace PBD;

Pool Session::Click::pool ("click", sizeof (Click), 128);

void
Session::click (nframes_t start, nframes_t nframes)
{
	TempoMap::BBTPointList *points;
	nframes_t end;
	Sample *buf;
	vector<Sample*> bufs;

	if (_click_io == 0) {
		return;
	}

	Glib::RWLock::WriterLock clickm (click_lock, Glib::TRY_LOCK);
	
	if (!clickm.locked() || _transport_speed != 1.0 || !_clicking || click_data == 0) {
		_click_io->silence (nframes);
		return;
	} 

	end = start + nframes;

	buf = _passthru_buffers[0];
	points = _tempo_map->get_points (start, end);

	if (points == 0) {
		goto run_clicks;
	}

	if (!points->empty()) {

		for (TempoMap::BBTPointList::iterator i = points->begin(); i != points->end(); ++i) {
			switch ((*i).type) {
			case TempoMap::Beat:
				if (click_emphasis_data == 0 || (click_emphasis_data && (*i).beat != 1)) {
					clicks.push_back (new Click ((*i).frame, click_length, click_data));
				}
				break;
				
			case TempoMap::Bar:
				if (click_emphasis_data) {
					clicks.push_back (new Click ((*i).frame, click_emphasis_length, click_emphasis_data));
				} 
				break;
			}
		}
	}
	
	delete points;
	
  run_clicks:
	
	memset (buf, 0, sizeof (Sample) * nframes);

	for (list<Click*>::iterator i = clicks.begin(); i != clicks.end(); ) {

		nframes_t copy;
		nframes_t internal_offset;
		Click *clk;
		list<Click*>::iterator next;

		clk = *i;
		next = i;
		++next;
	
		if (clk->start < start) {
			internal_offset = 0;
		} else {
			internal_offset = clk->start - start;
		}

		if (nframes < internal_offset) {
		         /* we've just located or something.. 
			    effectively going backwards.
			    lets get the flock out of here */
		        break;
		}

		copy = min (clk->duration - clk->offset, nframes - internal_offset);

		memcpy (buf + internal_offset, &clk->data[clk->offset], copy * sizeof (Sample));

		clk->offset += copy;

		if (clk->offset >= clk->duration) {
			delete clk;
			clicks.erase (i);
		}


		i = next;
	}

	_click_io->deliver_output (_passthru_buffers, 1, nframes);
}

void
Session::setup_click_sounds (int which)
{
	SNDFILE *sndfile;
	SF_INFO info;

	clear_clicks();

	if ((which == 0 || which == 1)) {
		
		if (click_data && click_data != default_click) {
			delete [] click_data;
			click_data = 0;
		}

		string path = Config->get_click_sound();

		if (path.empty()) {

			click_data = const_cast<Sample*> (default_click);
			click_length = default_click_length;

		} else {

			if ((sndfile = sf_open (path.c_str(), SFM_READ, &info)) == 0) {
				char errbuf[256];
				sf_error_str (0, errbuf, sizeof (errbuf) - 1);
				warning << string_compose (_("cannot open click soundfile %1 (%2)"), path, errbuf) << endmsg;
				_clicking = false;
				return;
			}
			
			click_data = new Sample[info.frames];
			click_length = info.frames;
			
			if (sf_read_float (sndfile, click_data, info.frames) != info.frames) {
				warning << _("cannot read data from click soundfile") << endmsg;			
				delete click_data;
				click_data = 0;
				_clicking = false;
			}
			
			sf_close (sndfile);

		}
	}
		
	if ((which == 0 || which == -1)) {

		if (click_emphasis_data && click_emphasis_data != default_click_emphasis) {
			delete [] click_emphasis_data;
			click_emphasis_data = 0;
		}

		string path = Config->get_click_emphasis_sound();

		if (path.empty()) {
			click_emphasis_data = const_cast<Sample*> (default_click_emphasis);
			click_emphasis_length = default_click_emphasis_length;
		} else {
			if ((sndfile = sf_open (path.c_str(), SFM_READ, &info)) == 0) {
				char errbuf[256];
				sf_error_str (0, errbuf, sizeof (errbuf) - 1);
				warning << string_compose (_("cannot open click emphasis soundfile %1 (%2)"), path, errbuf) << endmsg;
				return;
			}
			
			click_emphasis_data = new Sample[info.frames];
			click_emphasis_length = info.frames;
			
			if (sf_read_float (sndfile, click_emphasis_data, info.frames) != info.frames) {
				warning << _("cannot read data from click emphasis soundfile") << endmsg;			
				delete click_emphasis_data;
				click_emphasis_data = 0;
			}
			
			sf_close (sndfile);
		}
	}
}		

void
Session::clear_clicks ()
{
	Glib::RWLock::WriterLock lm (click_lock);

	for (Clicks::iterator i = clicks.begin(); i != clicks.end(); ++i) {
		delete *i;
	}

	clicks.clear ();
}