/*
    Copyright (C) 2006 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 <vector>

#include <sys/time.h>
#include <sys/stat.h>
#include <stdio.h> // for rename(), sigh
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>

#include <pbd/convert.h>
#include <pbd/basename.h>
#include <pbd/mountpoint.h>
#include <pbd/pathscanner.h>
#include <pbd/stl_delete.h>
#include <pbd/strsplit.h>
#include <pbd/shortpath.h>
#include <pbd/enumwriter.h>

#include <sndfile.h>

#include <glibmm/miscutils.h>
#include <glibmm/fileutils.h>
#include <glibmm/thread.h>

#include <ardour/audiofilesource.h>
#include <ardour/sndfile_helpers.h>
#include <ardour/sndfilesource.h>
#include <ardour/session.h>
#include <ardour/source_factory.h>

// if these headers come before sigc++ is included
// the parser throws ObjC++ errors. (nil is a keyword)
#ifdef HAVE_COREAUDIO 
#include <ardour/coreaudiosource.h>
#include <AudioToolbox/ExtendedAudioFile.h>
#include <AudioToolbox/AudioFormat.h>
#endif // HAVE_COREAUDIO

#include "i18n.h"

using namespace ARDOUR;
using namespace PBD;
using namespace Glib;

ustring AudioFileSource::peak_dir = "";
ustring AudioFileSource::search_path;

sigc::signal<void> AudioFileSource::HeaderPositionOffsetChanged;
uint64_t           AudioFileSource::header_position_offset = 0;

/* XXX maybe this too */
char   AudioFileSource::bwf_serial_number[13] = "000000000000";

struct SizedSampleBuffer {
    nframes_t size;
    Sample* buf;

    SizedSampleBuffer (nframes_t sz) : size (sz) { 
	    buf = new Sample[size];
    }

    ~SizedSampleBuffer() {
	    delete [] buf;
    }
};

Glib::StaticPrivate<SizedSampleBuffer> thread_interleave_buffer = GLIBMM_STATIC_PRIVATE_INIT;

AudioFileSource::AudioFileSource (Session& s, ustring path, Flag flags)
	: AudioSource (s, path), _flags (flags),
	  _channel (0)
{
	/* constructor used for existing external to session files. file must exist already */
	_is_embedded = AudioFileSource::determine_embeddedness (path);

	if (init (path, true)) {
		throw failed_constructor ();
	}

}

AudioFileSource::AudioFileSource (Session& s, ustring path, Flag flags, SampleFormat samp_format, HeaderFormat hdr_format)
	: AudioSource (s, path), _flags (flags),
	  _channel (0)
{
	/* constructor used for new internal-to-session files. file cannot exist */
	_is_embedded = false;

	if (init (path, false)) {
		throw failed_constructor ();
	}
}

AudioFileSource::AudioFileSource (Session& s, const XMLNode& node, bool must_exist)
	: AudioSource (s, node), _flags (Flag (Writable|CanRename))
          /* _channel is set in set_state() or init() */
{
	/* constructor used for existing internal-to-session files. file must exist */

	if (set_state (node)) {
		throw failed_constructor ();
	}

	string foo = _name;
	
	if (init (foo, must_exist)) {
		throw failed_constructor ();
	}
}

AudioFileSource::~AudioFileSource ()
{
	if (removable()) {
		unlink (_path.c_str());
		unlink (peakpath.c_str());
	}
}

bool
AudioFileSource::determine_embeddedness (ustring path)
{
	return (path.find("/") == 0);
}

bool
AudioFileSource::removable () const
{
	return (_flags & Removable) && ((_flags & RemoveAtDestroy) || ((_flags & RemovableIfEmpty) && length() == 0));
}

int
AudioFileSource::init (ustring pathstr, bool must_exist)
{
	_length = 0;
	timeline_position = 0;
	_peaks_built = false;

	if (!find (pathstr, must_exist, file_is_new, _channel)) {
		throw non_existent_source ();
	}

	if (file_is_new && must_exist) {
		return -1;
	}

	return 0;
}


ustring
AudioFileSource::peak_path (ustring audio_path)
{
	ustring base;

	base = PBD::basename_nosuffix (audio_path);
	base += '%';
	base += (char) ('A' + _channel);

	return _session.peak_path (base);
}

ustring
AudioFileSource::find_broken_peakfile (ustring peak_path, ustring audio_path)
{
	ustring str;

	/* check for the broken location in use by 2.0 for several months */
	
	str = broken_peak_path (audio_path);
	
	if (Glib::file_test (str, Glib::FILE_TEST_EXISTS)) {
		
		if (is_embedded()) {
			
			/* it would be nice to rename it but the nature of 
			   the bug means that we can't reliably use it.
			*/
			
			peak_path = str;
			
		} else {
			/* all native files are mono, so we can just rename
			   it.
			*/
			::rename (str.c_str(), peak_path.c_str());
		}
		
	} else {
		/* Nasty band-aid for older sessions that were created before we
		   used libsndfile for all audio files.
		*/
		
		
		str = old_peak_path (audio_path);	
		if (Glib::file_test (str, Glib::FILE_TEST_EXISTS)) {
			peak_path = str;
		}
	}

	return peak_path;
}

ustring
AudioFileSource::broken_peak_path (ustring audio_path)
{
	return Glib::build_filename(_session.peak_dir (), PBD::basename_nosuffix (audio_path) + ".peak");
}

ustring
AudioFileSource::old_peak_path (ustring audio_path)
{
	/* XXX hardly bombproof! fix me */

	struct stat stat_file;
	struct stat stat_mount;

	ustring mp = mountpoint (audio_path);

	stat (audio_path.c_str(), &stat_file);
	stat (mp.c_str(), &stat_mount);

	char buf[32];
#ifdef __APPLE__
	snprintf (buf, sizeof (buf), "%u-%u-%d.peak", stat_mount.st_ino, stat_file.st_ino, _channel);
#else
	snprintf (buf, sizeof (buf), "%ld-%ld-%d.peak", stat_mount.st_ino, stat_file.st_ino, _channel);
#endif

	ustring res = peak_dir;
	res += buf;

	return res;
}

bool
AudioFileSource::get_soundfile_info (ustring path, SoundFileInfo& _info, string& error_msg)
{
#ifdef HAVE_COREAUDIO
	if (CoreAudioSource::get_soundfile_info (path, _info, error_msg) == 0) {
		return true;
	}
#endif // HAVE_COREAUDIO

	if (SndFileSource::get_soundfile_info (path, _info, error_msg) != 0) {
		return true;
	}

	return false;
}

XMLNode&
AudioFileSource::get_state ()
{
	XMLNode& root (AudioSource::get_state());
	char buf[32];
	root.add_property (X_("flags"), enum_2_string (_flags));
	snprintf (buf, sizeof (buf), "%u", _channel);
	root.add_property (X_("channel"), buf);
	return root;
}

int
AudioFileSource::set_state (const XMLNode& node)
{
	const XMLProperty* prop;

	if (AudioSource::set_state (node)) {
		return -1;
	}

	if ((prop = node.property (X_("flags"))) != 0) {
		_flags = Flag (string_2_enum (prop->value(), _flags));
	} else {
		_flags = Flag (0);

	}

	if ((prop = node.property (X_("channel"))) != 0) {
		_channel = atoi (prop->value());
	} else {
		_channel = 0;
	}

	if ((prop = node.property (X_("name"))) != 0) {
		_is_embedded = AudioFileSource::determine_embeddedness (prop->value());
	} else {
		_is_embedded = false;
	}

	if ((prop = node.property (X_("destructive"))) != 0) {
		/* old style, from the period when we had DestructiveFileSource */
		_flags = Flag (_flags | Destructive);
	}

	return 0;
}

void
AudioFileSource::mark_for_remove ()
{
	// This operation is not allowed for sources for destructive tracks or embedded files.
	// Fortunately mark_for_remove() is never called for embedded files. This function
	// must be fixed if that ever happens.
	if (_flags & Destructive) {
		return;
	}

	_flags = Flag (_flags | Removable | RemoveAtDestroy);
}

void
AudioFileSource::mark_streaming_write_completed ()
{
	if (!writable()) {
		return;
	}

	/* XXX notice that we're readers of _peaks_built
	   but we must hold a solid lock on PeaksReady.
	*/

	Glib::Mutex::Lock lm (_lock);
	
	if (_peaks_built) {
		PeaksReady (); /* EMIT SIGNAL */
	}
}

void
AudioFileSource::mark_take (ustring id)
{
	if (writable()) {
		_take_id = id;
	}
}

int
AudioFileSource::move_to_trash (const ustring& trash_dir_name)
{
	if (is_embedded()) {
		cerr << "tried to move an embedded region to trash" << endl;
		return -1;
	}

	ustring newpath;

	if (!writable()) {
		return -1;
	}

	/* don't move the file across filesystems, just
	   stick it in the `trash_dir_name' directory
	   on whichever filesystem it was already on.
	*/
	
	newpath = Glib::path_get_dirname (_path);
	newpath = Glib::path_get_dirname (newpath); 

	cerr << "from " << _path << " dead dir looks like " << newpath << endl;

	newpath += '/';
	newpath += trash_dir_name;
	newpath += '/';
	newpath += Glib::path_get_basename (_path);

	if (access (newpath.c_str(), F_OK) == 0) {

		/* the new path already exists, try versioning */
		
		char buf[PATH_MAX+1];
		int version = 1;
		ustring newpath_v;

		snprintf (buf, sizeof (buf), "%s.%d", newpath.c_str(), version);
		newpath_v = buf;

		while (access (newpath_v.c_str(), F_OK) == 0 && version < 999) {
			snprintf (buf, sizeof (buf), "%s.%d", newpath.c_str(), ++version);
			newpath_v = buf;
		}
		
		if (version == 999) {
			error << string_compose (_("there are already 1000 files with names like %1; versioning discontinued"),
					  newpath)
			      << endmsg;
		} else {
			newpath = newpath_v;
		}

	} else {

		/* it doesn't exist, or we can't read it or something */

	}

	if (::rename (_path.c_str(), newpath.c_str()) != 0) {
		error << string_compose (_("cannot rename audio file source from %1 to %2 (%3)"),
				  _path, newpath, strerror (errno))
		      << endmsg;
		return -1;
	}

	if (::unlink (peakpath.c_str()) != 0) {
		error << string_compose (_("cannot remove peakfile %1 for %2 (%3)"),
				  peakpath, _path, strerror (errno))
		      << endmsg;
		/* try to back out */
		rename (newpath.c_str(), _path.c_str());
		return -1;
	}
	    
	_path = newpath;
	peakpath = "";
	
	/* file can not be removed twice, since the operation is not idempotent */

	_flags = Flag (_flags & ~(RemoveAtDestroy|Removable|RemovableIfEmpty));

	return 0;
}

bool
AudioFileSource::find (ustring& pathstr, bool must_exist, bool& isnew, uint16_t& chan)
{
	ustring::size_type pos;
	bool ret = false;

	isnew = false;

	if (pathstr[0] != '/') {

		/* non-absolute pathname: find pathstr in search path */

		vector<ustring> dirs;
		int cnt;
		ustring fullpath;
		ustring keeppath;

		if (search_path.length() == 0) {
			error << _("FileSource: search path not set") << endmsg;
			goto out;
		}

		split (search_path, dirs, ':');

		cnt = 0;
		
		for (vector<ustring>::iterator i = dirs.begin(); i != dirs.end(); ++i) {

			fullpath = *i;
			if (fullpath[fullpath.length()-1] != '/') {
				fullpath += '/';
			}

			fullpath += pathstr;

			/* i (paul) made a nasty design error by using ':' as a special character in
			   Ardour 0.99 .. this hack tries to make things sort of work.
			*/
			
			if ((pos = pathstr.find_last_of (':')) != ustring::npos) {
				
				if (Glib::file_test (fullpath, Glib::FILE_TEST_EXISTS|Glib::FILE_TEST_IS_REGULAR)) {

					/* its a real file, no problem */
					
					keeppath = fullpath;
					++cnt;

				} else {
					
					if (must_exist) {
						
						/* might be an older session using file:channel syntax. see if the version
						   without the :suffix exists
						 */
						
						ustring shorter = pathstr.substr (0, pos);
						fullpath = *i;

						if (fullpath[fullpath.length()-1] != '/') {
							fullpath += '/';
						}

						fullpath += shorter;

						if (Glib::file_test (pathstr, Glib::FILE_TEST_EXISTS|Glib::FILE_TEST_IS_REGULAR)) {
							chan = atoi (pathstr.substr (pos+1));
							pathstr = shorter;
							keeppath = fullpath;
							++cnt;
						} 
						
					} else {
						
						/* new derived file (e.g. for timefx) being created in a newer session */
						
					}
				}

			} else {

				if (Glib::file_test (fullpath, Glib::FILE_TEST_EXISTS|Glib::FILE_TEST_IS_REGULAR)) {
					keeppath = fullpath;
					++cnt;
				} 
			}
		}

		if (cnt > 1) {

			error << string_compose (_("FileSource: \"%1\" is ambigous when searching %2\n\t"), pathstr, search_path) << endmsg;
			goto out;

		} else if (cnt == 0) {

			if (must_exist) {
				error << string_compose(_("Filesource: cannot find required file (%1): while searching %2"), pathstr, search_path) << endmsg;
				goto out;
			} else {
				isnew = true;
			}
		}

		_name = pathstr;
		_path = keeppath;
		ret = true;

	} else {
		
		/* external files and/or very very old style sessions include full paths */

		/* ugh, handle ':' situation */

		if ((pos = pathstr.find_last_of (':')) != ustring::npos) {
			
			ustring shorter = pathstr.substr (0, pos);

			if (Glib::file_test (shorter, Glib::FILE_TEST_EXISTS|Glib::FILE_TEST_IS_REGULAR)) {
				chan = atoi (pathstr.substr (pos+1));
				pathstr = shorter;
			}
		}
		
		_path = pathstr;

		if (is_embedded()) {
			_name = pathstr;
		} else {
			_name = pathstr.substr (pathstr.find_last_of ('/') + 1);
		}

		if (!Glib::file_test (pathstr, Glib::FILE_TEST_EXISTS|Glib::FILE_TEST_IS_REGULAR)) {

			/* file does not exist or we cannot read it */
			
			if (must_exist) {
				error << string_compose(_("Filesource: cannot find required file (%1): %2"), _path, strerror (errno)) << endmsg;
				goto out;
			}
			
			if (errno != ENOENT) {
				error << string_compose(_("Filesource: cannot check for existing file (%1): %2"), _path, strerror (errno)) << endmsg;
				goto out;
			}
			
			/* a new file */

			isnew = true;
			ret = true;

		} else {
			
			/* already exists */

			ret = true;

		}
	}
	
  out:
	return ret;
}

void
AudioFileSource::set_search_path (ustring p)
{
	search_path = p;
}

void
AudioFileSource::set_header_position_offset (nframes_t offset)
{
	header_position_offset = offset;
	HeaderPositionOffsetChanged ();
}

void
AudioFileSource::set_timeline_position (int64_t pos)
{
	timeline_position = pos;
}

void
AudioFileSource::set_allow_remove_if_empty (bool yn)
{
	if (!writable()) {
		return;
	}

	if (yn) {
		_flags = Flag (_flags | RemovableIfEmpty);
	} else {
		_flags = Flag (_flags & ~RemovableIfEmpty);
	}
}

int
AudioFileSource::set_name (ustring newname, bool destructive)
{
	Glib::Mutex::Lock lm (_lock);
	ustring oldpath = _path;
	ustring newpath = Session::change_audio_path_by_name (oldpath, _name, newname, destructive);

	if (newpath.empty()) {
		error << string_compose (_("programming error: %1"), "cannot generate a changed audio path") << endmsg;
		return -1;
	}

	// Test whether newpath exists, if yes notify the user but continue. 
	if (access(newpath.c_str(),F_OK) == 0) {
		error << _("Programming error! Ardour tried to rename a file over another file! It's safe to continue working, but please report this to the developers.") << endmsg;
		return -1;
	}

	if (rename (oldpath.c_str(), newpath.c_str()) != 0) {
		error << string_compose (_("cannot rename audio file %1 to %2"), _name, newpath) << endmsg;
		return -1;
	}

	_name = Glib::path_get_basename (newpath);
	_path = newpath;

	return rename_peakfile (peak_path (_path));
}

bool
AudioFileSource::is_empty (Session& s, ustring path)
{
	SoundFileInfo info;
	string err;
	
	if (!get_soundfile_info (path, info, err)) {
		/* dangerous: we can't get info, so assume that its not empty */
		return false; 
	}

	return info.length == 0;
}

int
AudioFileSource::setup_peakfile ()
{
	if (!(_flags & NoPeakFile)) {
		return initialize_peakfile (file_is_new, _path);
	} else {
		return 0;
	}
}

bool
AudioFileSource::safe_file_extension(ustring file)
{
	const char* suffixes[] = {
		".wav", ".WAV",
		".aiff", ".AIFF",
		".caf", ".CAF",
		".aif", ".AIF",
		".amb", ".AMB",
		".snd", ".SND",
		".au", ".AU",
		".raw", ".RAW",
		".sf", ".SF",
		".cdr", ".CDR",
		".smp", ".SMP",
		".maud", ".MAUD",
		".vwe", ".VWE",
		".paf",
#ifdef HAVE_FLAC
		".flac", ".FLAC",
#endif // HAVE_FLAC
#ifdef HAVE_COREAUDIO
		".mp3", ".MP3",
		".aac", ".AAC",
		".mp4", ".MP4",
#endif // HAVE_COREAUDIO
		".voc", ".VOC"
	};

	for (size_t n = 0; n < sizeof(suffixes)/sizeof(suffixes[0]); ++n) {
		if (file.rfind (suffixes[n]) == file.length() - strlen (suffixes[n])) {
			return true;
		}
	}

	return false;
}

void
AudioFileSource::mark_immutable ()
{
	/* destructive sources stay writable, and their other flags don't
	   change.
	*/

	if (!(_flags & Destructive)) {
		_flags = Flag (_flags & ~(Writable|Removable|RemovableIfEmpty|RemoveAtDestroy|CanRename));
	}
}


Sample*
AudioFileSource::get_interleave_buffer (nframes_t size)
{
	SizedSampleBuffer* ssb;

	if ((ssb = thread_interleave_buffer.get()) == 0) {
		ssb = new SizedSampleBuffer (size);
		thread_interleave_buffer.set (ssb);
	}

	if (ssb->size < size) {
		ssb = new SizedSampleBuffer (size);
		thread_interleave_buffer.set (ssb);
	}

	return ssb->buf;
}
