/*
    Copyright (C) 2000 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 <cstdio>
#include <cstdlib>
#include <string>
#include <climits>
#include <cerrno>
#include <unistd.h>
#include <sys/stat.h>
#include <time.h>

#include <sndfile.h>
#include <samplerate.h>

#include <glibmm.h>

#include <boost/scoped_array.hpp>
#include <boost/shared_array.hpp>

#include <pbd/basename.h>
#include <pbd/convert.h>

#include <ardour/ardour.h>
#include <ardour/session.h>
#include <ardour/audio_diskstream.h>
#include <ardour/sndfilesource.h>
#include <ardour/sndfile_helpers.h>
#include <ardour/audioregion.h>
#include <ardour/region_factory.h>
#include <ardour/source_factory.h>
#include <ardour/resampled_source.h>
#include <ardour/sndfileimportable.h>
#include <ardour/analyser.h>

#ifdef HAVE_COREAUDIO
#include <ardour/caimportable.h>
#endif

#include "i18n.h"

using namespace ARDOUR;
using namespace PBD;

static boost::shared_ptr<ImportableSource>
open_importable_source (const string& path, nframes_t samplerate, ARDOUR::SrcQuality quality)
{
	/* try libsndfile first, because it can get BWF info from .wav, which ExtAudioFile cannot.
	   We don't necessarily need that information in an ImportableSource, but it keeps the 
	   logic the same as in SourceFactory::create() 
	 */

	cerr << "Trying to open " << path << endl;

	try { 
		boost::shared_ptr<SndFileImportableSource> source(new SndFileImportableSource(path));
		
		if (source->samplerate() == samplerate) {
			return source;
		}
		
		/* rewrap as a resampled source */
		
		boost::shared_ptr<ImportableSource> r(new ResampledImportableSource(source, samplerate, quality));
		cerr << "sndfile returns " << r << endl;
		return r;
	}

	catch (...) {

		cerr << "\topen failed\n";

#ifdef HAVE_COREAUDIO

		cerr << "trying to use coreaudio to open " << path << endl;

		/* libsndfile failed, see if we can use CoreAudio to handle the IO */
		
		CAImportableSource* src = new CAImportableSource(path);
		boost::shared_ptr<CAImportableSource> source (src);
		
		if (source->samplerate() == samplerate) {
			return source;
		}
		
		/* rewrap as a resampled source */
		
		 boost::shared_ptr<ImportableSource> r(new ResampledImportableSource(source, samplerate, quality));
		 cerr << "coreaudio returns " << r << endl;
		 return r;

#else
		throw; // rethrow
#endif

	}
}

static std::string
get_non_existent_filename (const bool allow_replacing, const std::string destdir, const std::string& basename, uint channel, uint channels)
{
	char buf[PATH_MAX+1];
	bool goodfile = false;
	string base(basename);

	do {
		if (channels == 2) {
			if (channel == 0) {
				snprintf (buf, sizeof(buf), "%s-L.wav", base.c_str());
			} else {
				snprintf (buf, sizeof(buf), "%s-R.wav", base.c_str());
			}
		} else if (channels > 1) {
			snprintf (buf, sizeof(buf), "%s-c%d.wav", base.c_str(), channel+1);
		} else {
			snprintf (buf, sizeof(buf), "%s.wav", base.c_str());
		}
		

		string tempname = destdir + "/" + buf;
		if (!allow_replacing && Glib::file_test (tempname, Glib::FILE_TEST_EXISTS)) {

			/* if the file already exists, we must come up with
			 *  a new name for it.  for now we just keep appending
			 *  _ to basename
			 */

			base += "_";

		} else {

			goodfile = true;
		}

	} while ( !goodfile);

	return buf;
}

static vector<string>
get_paths_for_new_sources (const bool allow_replacing, const string& import_file_path, const string& session_dir, uint channels)
{
	vector<string> new_paths;
	const string basename = basename_nosuffix (import_file_path);

	cerr << "Getting paths for new sources based on " << import_file_path << " => " << basename << endl;

	for (uint n = 0; n < channels; ++n) {

		std::string filepath;

		filepath = Glib::build_filename (session_dir, 
                                                 get_non_existent_filename (allow_replacing, session_dir, basename, n, channels));

		cerr << "\t" << filepath << endl;

		new_paths.push_back (filepath);
	}

	return new_paths;
}

static bool
map_existing_mono_sources (const vector<string>& new_paths, Session& sess,
		           uint samplerate, vector<boost::shared_ptr<AudioFileSource> >& newfiles, Session *session)
{
	for (vector<string>::const_iterator i = new_paths.begin();
			i != new_paths.end(); ++i)
	{
		boost::shared_ptr<Source> source = session->source_by_path_and_channel(*i, 0);

		if (source == 0) {
			error << string_compose(_("Could not find a source for %1 even though we are updating this file!"), (*i)) << endl;
			return false;
		}

		newfiles.push_back(boost::dynamic_pointer_cast<AudioFileSource>(source));
	}
	return true;
}

static bool
create_mono_sources_for_writing (const vector<string>& new_paths, Session& sess,
		uint samplerate, vector<boost::shared_ptr<AudioFileSource> >& newfiles,
		nframes_t timeline_position)
{
    boost::shared_ptr<AudioFileSource> afs;
    
	for (vector<string>::const_iterator i = new_paths.begin();
			i != new_paths.end(); ++i)
	{
		boost::shared_ptr<Source> source;

		try {
			cerr << "Try to create " << *i << endl;
			source = SourceFactory::createWritable (
				sess,
				i->c_str(),
				false, // destructive
				samplerate
				);
		}
		catch (const failed_constructor& err)
		{
			error << string_compose (_("Unable to create file %1 during import"), *i) << endmsg;
			return false;
		}

		cerr << "\thave new file\n";
		afs = boost::dynamic_pointer_cast<AudioFileSource>(source);
		afs->set_timeline_position(timeline_position);
		newfiles.push_back(afs);
	}
	return true;
}

static std::string
compose_status_message (const string& path,
			uint file_samplerate,
			uint session_samplerate,
			uint current_file,
			uint total_files)
{
	if (file_samplerate != session_samplerate) {
		return string_compose (_("converting %1\n(resample from %2KHz to %3KHz)\n(%4 of %5)"),
				       Glib::path_get_basename (path),
				       file_samplerate/1000.0f,
				       session_samplerate/1000.0f,
				       current_file, total_files);
	}

	return  string_compose (_("converting %1\n(%2 of %3)"), 
				Glib::path_get_basename (path),
				current_file, total_files);
}

static void
write_audio_data_to_new_files (ImportableSource* source, Session::import_status& status,
			       vector<boost::shared_ptr<AudioFileSource> >& newfiles)
{
	const nframes_t nframes = ResampledImportableSource::blocksize;
	uint channels = source->channels();

	boost::scoped_array<float> data(new float[nframes * channels]);
	vector<boost::shared_array<Sample> > channel_data;

	for (uint n = 0; n < channels; ++n) {
		channel_data.push_back(boost::shared_array<Sample>(new Sample[nframes]));
	}
	
	uint read_count = 0;
	status.progress = 0.0f;

	while (!status.cancel) {

		nframes_t nread, nfread;
		uint x;
		uint chn;

		if ((nread = source->read (data.get(), nframes)) == 0) {
			break;
		}
		nfread = nread / channels;

		/* de-interleave */

		for (chn = 0; chn < channels; ++chn) {

			nframes_t n;
			for (x = chn, n = 0; n < nfread; x += channels, ++n) {
				channel_data[chn][n] = (Sample) data[x];
			}
		}

		/* flush to disk */

		for (chn = 0; chn < channels; ++chn) {
			newfiles[chn]->write (channel_data[chn].get(), nfread);
		}

		read_count += nread;
		status.progress = read_count / (source->ratio () * source->length() * channels);
	}
}

static void
remove_file_source (boost::shared_ptr<AudioFileSource> file_source)
{
	::unlink (file_source->path().c_str());
}

// This function is still unable to cleanly update an existing source, even though
// it is possible to set the import_status flag accordingly. The functinality
// is disabled at the GUI until the Source implementations are able to provide
// the necessary API.
void
Session::import_audiofiles (import_status& status)
{
	typedef vector<boost::shared_ptr<AudioFileSource> > AudioSources;
	AudioSources all_new_sources;

	status.sources.clear ();
	
	for (vector<string>::iterator p = status.paths.begin(); p != status.paths.end() && !status.cancel; ++p)
	{
		status.count++;

		boost::shared_ptr<ImportableSource> source;
		
		try
		{
			source = open_importable_source (*p, frame_rate(), status.quality);
		}
		
		catch (const failed_constructor& err)
		{
			error << string_compose(_("Import: cannot open input sound file \"%1\""), (*p)) << endmsg;
			status.done = status.cancel = true;
			return;
		}

		vector<string> new_paths = get_paths_for_new_sources (status.replace_existing_source,
								      *p,
								      discover_best_sound_dir (),
								      source->channels());
		
		AudioSources newfiles;

		if (status.replace_existing_source) {
			fatal << "THIS IS NOT IMPLEMENTED YET, IT SHOULD NEVER GET CALLED!!! DYING!" << endl;
			status.cancel = !map_existing_mono_sources (new_paths, *this, frame_rate(), newfiles, this);
		} else {
			status.cancel = !create_mono_sources_for_writing (new_paths, *this, frame_rate(), newfiles, source->natural_position());
		}

		// copy on cancel/failure so that any files that were created will be removed below
		std::copy (newfiles.begin(), newfiles.end(), std::back_inserter(all_new_sources));

		if (status.cancel) break;

		for (AudioSources::iterator i = newfiles.begin(); i != newfiles.end(); ++i) {
			(*i)->prepare_for_peakfile_writes ();
		}

		status.doing_what = compose_status_message (*p, source->samplerate(),
				frame_rate(), status.count, status.total);

		write_audio_data_to_new_files (source.get(), status, newfiles);
	}

	if (!status.cancel) {
		struct tm* now;
		time_t xnow;
		time (&xnow);
		now = localtime (&xnow);
		status.freeze = true;

		/* flush the final length(s) to the header(s) */

		for (AudioSources::iterator x = all_new_sources.begin(); x != all_new_sources.end(); ++x)
		{
			(*x)->update_header((*x)->natural_position(), *now, xnow);
			(*x)->done_with_peakfile_writes ();
			
			/* now that there is data there, requeue the file for analysis */
			
			if (Config->get_auto_analyse_audio()) {
				Analyser::queue_source_for_analysis (boost::static_pointer_cast<Source>(*x), false);
			}
		}

		/* save state so that we don't lose these new Sources */

		save_state (_name);

		std::copy (all_new_sources.begin(), all_new_sources.end(), std::back_inserter(status.sources));
	} else {
		// this can throw...but it seems very unlikely
		std::for_each (all_new_sources.begin(), all_new_sources.end(), remove_file_source);
	}

	status.done = true;
}