#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# SoundConverter - GNOME application for converting between audio formats.
# Copyright 2004 Lars Wirzenius
# Copyright 2005-2012 Gautier Portet
#
# 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; version 3 of the License.
#
# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307
# USA

import os
import sys
from urlparse import urlparse
from gettext import gettext as _

import gobject
import gst
import gst.pbutils
import gnomevfs
import gconf

from fileoperations import vfs_encode_filename, file_encode_filename
from fileoperations import unquote_filename, vfs_makedirs, vfs_unlink
from fileoperations import vfs_rename
from fileoperations import vfs_exists
from fileoperations import beautify_uri
from fileoperations import use_gnomevfs
from task import BackgroundTask
from queue import TaskQueue
from utils import debug, log
from settings import mime_whitelist, filename_blacklist
from error import show_error
try:
    from notify import notification
except:
    def notification(msg):
        pass
        
from fnmatch import fnmatch

import time
import gtk
def gtk_iteration():
    while gtk.events_pending():
        gtk.main_iteration(False)


def gtk_sleep(duration):
    start = time.time()
    while time.time() < start + duration:
        time.sleep(0.010)
        gtk_iteration()

import gconf
# load gstreamer audio profiles
_GCONF_PROFILE_PATH = "/system/gstreamer/0.10/audio/profiles/"
_GCONF_PROFILE_LIST_PATH = "/system/gstreamer/0.10/audio/global/profile_list"
audio_profiles_list = []
audio_profiles_dict = {}

_GCONF = gconf.client_get_default()
profiles = _GCONF.get_list(_GCONF_PROFILE_LIST_PATH, 1)
for name in profiles:
    if _GCONF.get_bool(_GCONF_PROFILE_PATH + name + "/active"):
        # get profile
        description = _GCONF.get_string(_GCONF_PROFILE_PATH + name + "/name")
        extension = _GCONF.get_string(_GCONF_PROFILE_PATH + name + "/extension")
        pipeline = _GCONF.get_string(_GCONF_PROFILE_PATH + name + "/pipeline")
        # check profile validity
        if not extension or not pipeline:
            continue
        if not description:
            description = extension
        if description in audio_profiles_dict:
            continue
        # store
        profile = description, extension, pipeline
        audio_profiles_list.append(profile)
        audio_profiles_dict[description] = profile

required_elements = ('decodebin', 'fakesink', 'audioconvert', 'typefind', 'audiorate')
for element in required_elements:
    if not gst.element_factory_find(element):
        print("required gstreamer element \'%s\' not found." % element)
        sys.exit(1)

if gst.element_factory_find('giosrc'):
    gstreamer_source = 'giosrc'
    gstreamer_sink = 'giosink'
    encode_filename = vfs_encode_filename
    use_gnomevfs = True
    print('  using gio')
elif gst.element_factory_find('gnomevfssrc'):
    gstreamer_source = 'gnomevfssrc'
    gstreamer_sink = 'gnomevfssink'
    encode_filename = vfs_encode_filename
    use_gnomevfs = True
    print('  using deprecated gnomevfssrc')
else:
    gstreamer_source = 'filesrc'
    gstreamer_sink = 'filesink'
    encode_filename = file_encode_filename
    print('  not using gnomevfssrc, look for a gnomevfs gstreamer package.')

# used to dismiss codec installation if the user already canceled it
user_canceled_codec_installation = False

encoders = (
    ('flacenc',   'FLAC'),
    ('wavenc',    'WAV'),
    ('vorbisenc', 'Ogg Vorbis'),
    ('oggmux',    'Ogg Vorbis'),
    ('id3v2mux',  'MP3 Tags'),
    ('xingmux',   'Xing Header'),
    ('lame',      'MP3'),
    ('faac',      'AAC'),
    ('mp4mux',    'AAC'),
    ('opusenc',   'Opus'),
    )

available_elements = set()

for encoder, name in encoders:
    have_it = bool(gst.element_factory_find(encoder))
    if have_it:
        available_elements.add(encoder)
    else:
        print ('  "%s" gstreamer element not found'
            ', disabling %s output.' % (encoder, name))

if 'oggmux' not in available_elements:
    available_elements.discard('vorbisenc')


class Pipeline(BackgroundTask):

    """A background task for running a GstPipeline."""

    def __init__(self):
        BackgroundTask.__init__(self)
        self.pipeline = None
        self.sound_file = None
        self.command = []
        self.parsed = False
        self.signals = []
        self.processing = False
        self.eos = False
        self.error = None
        self.connected_signals = []

    def started(self):
        self.play()

    def cleanup(self):
        for element, sid in self.connected_signals:
            element.disconnect(sid)
        self.connected_signals = []
        self.stop_pipeline()

    def aborted(self):
        self.cleanup()

    def finished(self):
        self.cleanup()

    def add_command(self, command):
        self.command.append(command)

    def add_signal(self, name, signal, callback):
        self.signals.append((name, signal, callback,))

    def toggle_pause(self, paused):
        if not self.pipeline:
            debug('toggle_pause(): pipeline is None !')
            return

        if paused:
            self.pipeline.set_state(gst.STATE_PAUSED)
        else:
            self.pipeline.set_state(gst.STATE_PLAYING)

    def found_tag(self, decoder, something, taglist):
        pass

    def restart(self):
        self.parsed = False
        self.duration = None
        self.finished()
        if vfs_exists(self.output_filename):
            vfs_unlink(self.output_filename)
        self.play()

    def install_plugin_cb(self, result):
        if result in (gst.pbutils.INSTALL_PLUGINS_SUCCESS,
                      gst.pbutils.INSTALL_PLUGINS_PARTIAL_SUCCESS):
            gst.update_registry()
            self.restart()
            return
        if result == gst.pbutils.INSTALL_PLUGINS_USER_ABORT:
            self.error = _('Plugin installation aborted.')
            global user_canceled_codec_installation
            user_canceled_codec_installation = True
            self.done()
            return
        self.done()
        show_error('Error', 'failed to install plugins: %s' % gobject.markup_escape_text(str(result)))

    def on_error(self, error):
        self.error = error
        log('error: %s (%s)' % (error, self.command))

    def on_message(self, bus, message):
        t = message.type
        import gst
        if t == gst.MESSAGE_ERROR:
            error, _ = message.parse_error()
            self.eos = True
            self.error = error
            self.on_error(error)
            self.done()
        elif gst.pbutils.is_missing_plugin_message(message):
            global user_canceled_codec_installation
            detail = gst.pbutils.missing_plugin_message_get_installer_detail(message)
            debug('missing plugin:', detail.split('|')[3] , self.sound_file.uri)
            self.pipeline.set_state(gst.STATE_NULL)
            if gst.pbutils.install_plugins_installation_in_progress():
                while gst.pbutils.install_plugins_installation_in_progress():
                    gtk_sleep(0.1)
                self.restart()
                return
            if user_canceled_codec_installation:
                self.error = 'Plugin installation cancelled'
                debug(self.error)
                self.done()
                return
            ctx = gst.pbutils.InstallPluginsContext()
            gst.pbutils.install_plugins_async([detail], ctx, self.install_plugin_cb)

        elif t == gst.MESSAGE_EOS:
            self.eos = True
            self.done()

        elif t == gst.MESSAGE_TAG:
            self.found_tag(self, '', message.parse_tag())
        return True

    def play(self):
        if not self.parsed:
            command = ' ! '.join(self.command)
            debug('launching: \'%s\'' % command)
            try:
                self.pipeline = gst.parse_launch(command)
                bus = self.pipeline.get_bus()
                assert not self.connected_signals
                self.connected_signals = []
                for name, signal, callback in self.signals:
                    if name:
                        element = self.pipeline.get_by_name(name)
                    else:
                        element = bus
                    sid = element.connect(signal, callback)
                    self.connected_signals.append((element, sid,))

                self.parsed = True

            except gobject.GError, e:
                show_error('GStreamer error when creating pipeline', str(e))
                self.error = str(e)
                self.eos = True
                self.done()
                return

            bus.add_signal_watch()
            watch_id = bus.connect('message', self.on_message)
            self.watch_id = watch_id

        self.pipeline.set_state(gst.STATE_PLAYING)

    def stop_pipeline(self):
        if not self.pipeline:
            debug('pipeline already stopped!')
            return
        bus = self.pipeline.get_bus()
        bus.disconnect(self.watch_id)
        bus.remove_signal_watch()
        self.pipeline.set_state(gst.STATE_NULL)
        #self.pipeline = None

    def get_position(self):
        return NotImplementedError


class TypeFinder(Pipeline):

    def __init__(self, sound_file):
        Pipeline.__init__(self)
        self.sound_file = sound_file

        command = '%s location="%s" ! typefind name=typefinder ! fakesink' % \
            (gstreamer_source, encode_filename(self.sound_file.uri))
        self.add_command(command)
        self.add_signal('typefinder', 'have-type', self.have_type)

    def on_error(self, error):
        self.error = error
        log('error: %s (%s)' % (error, self.sound_file.filename_for_display))

    def set_found_type_hook(self, found_type_hook):
        self.found_type_hook = found_type_hook

    def have_type(self, typefind, probability, caps):
        mime_type = caps.to_string()
        debug('have_type:', mime_type,
                                self.sound_file.filename_for_display)
        self.sound_file.mime_type = None
        #self.sound_file.mime_type = mime_type
        for t in mime_whitelist:
            if t in mime_type:
                self.sound_file.mime_type = mime_type
        if not self.sound_file.mime_type:
            log('mime type skipped: %s' % mime_type)
        for t in filename_blacklist:
            if fnmatch(self.sound_file.uri, t):
                self.sound_file.mime_type = None
                log('filename blacklisted (%s): %s' % (t,
                        self.sound_file.filename_for_display))
                
        self.pipeline.set_state(gst.STATE_NULL)
        self.done()

    def finished(self):
        Pipeline.finished(self)
        if self.error:
            return
        if self.found_type_hook and self.sound_file.mime_type:
            gobject.idle_add(self.found_type_hook, self.sound_file,
                                self.sound_file.mime_type)
            self.sound_file.mime_type = True # remove string


class Decoder(Pipeline):

    """A GstPipeline background task that decodes data and finds tags."""

    def __init__(self, sound_file):
        Pipeline.__init__(self)
        self.sound_file = sound_file
        self.time = 0
        self.position = 0

        command = '%s location="%s" name=src ! decodebin name=decoder' % \
            (gstreamer_source, encode_filename(self.sound_file.uri))
        self.add_command(command)
        self.add_signal('decoder', 'new-decoded-pad', self.new_decoded_pad)

    def on_error(self, error):
        self.error = error
        log('error: %s (%s)' % (error,
            self.sound_file.filename_for_display))

    def have_type(self, typefind, probability, caps):
        pass

    def query_duration(self):
        """
        Ask for the duration of the current pipeline.
        """
        try:
            if not self.sound_file.duration and self.pipeline:
                self.sound_file.duration = self.pipeline.query_duration(
                                            gst.FORMAT_TIME)[0] / gst.SECOND
                debug('got file duration:', self.sound_file.duration)
                if self.sound_file.duration < 0:
                    self.sound_file.duration = None
        except gst.QueryError:
            self.sound_file.duration = None

    def query_position(self):
        """
        Ask for the stream position of the current pipeline.
        """
        try:
            if self.pipeline:
                self.position = self.pipeline.query_position(
                                            gst.FORMAT_TIME)[0] / gst.SECOND
                if self.position < 0:
                    self.position = 0
        except gst.QueryError:
            self.position = 0


    def found_tag(self, decoder, something, taglist):
        """
        Called when the decoder reads a tag.
        """
        debug('found_tags:', self.sound_file.filename_for_display)
        for k in taglist.keys():
            if 'image' not in k:
                debug('\t%s=%s' % (k, taglist[k]))
            if isinstance(taglist[k], gst.Date):
                taglist['year'] = taglist[k].year
                taglist['date'] = '%04d-%02d-%02d' % (taglist[k].year,
                                    taglist[k].month, taglist[k].day)
        tag_whitelist = (
            'artist',
            'album',
            'title',
            'track-number',
            'track-count',
            'genre',
            'date',
            'year',
            'timestamp',
            'disc-number',
            'disc-count',
        )
        tags = {}
        for k in taglist.keys():
            if k in tag_whitelist:
                tags[k] = taglist[k]

        self.sound_file.tags.update(tags)
        self.query_duration()

    def new_decoded_pad(self, decoder, pad, is_last):
        """ called when a decoded pad is created """
        self.query_duration()
        self.processing = True

    def finished(self):
        Pipeline.finished(self)

    def get_sound_file(self):
        return self.sound_file

    def get_input_uri(self):
        return self.sound_file.uri

    def get_duration(self):
        """ return the total duration of the sound file """
        self.query_duration()
        return self.sound_file.duration

    def get_position(self):
        """ return the current pipeline position in the stream """
        self.query_position()
        return self.position


class TagReader(Decoder):

    """A GstPipeline background task for finding meta tags in a file."""

    def __init__(self, sound_file):
        Decoder.__init__(self, sound_file)
        self.found_tag_hook = None
        self.found_tags = False
        self.tagread = False
        self.run_start_time = 0
        self.add_command('fakesink')
        self.add_signal(None, 'message::state-changed', self.on_state_changed)
        self.tagread = False

    def set_found_tag_hook(self, found_tag_hook):
        self.found_tag_hook = found_tag_hook

    def on_state_changed(self, bus, message):
        prev, new, pending = message.parse_state_changed()
        if new == gst.STATE_PLAYING and not self.tagread:
            self.tagread = True
            debug('TagReading done...')
            self.done()

    def finished(self):
        Pipeline.finished(self)
        self.sound_file.tags_read = True
        if self.found_tag_hook:
            gobject.idle_add(self.found_tag_hook, self)


class Converter(Decoder):

    """A background task for converting files to another format."""

    def __init__(self, sound_file, output_filename, output_type,
                    delete_original=False, output_resample=False,
                    resample_rate=48000, force_mono=False):
        Decoder.__init__(self, sound_file)

        self.output_filename = output_filename
        self.output_type = output_type
        self.vorbis_quality = 0.6
        self.aac_quality = 192
        self.mp3_bitrate = 192
        self.mp3_mode = 'vbr'
        self.mp3_quality = 3
        self.flac_compression = 8
        self.wav_sample_width = 16

        self.output_resample = output_resample
        self.resample_rate = resample_rate
        self.force_mono = force_mono

        self.delete_original = delete_original

        self.got_duration = False

    def init(self):
        self.encoders = {
            'audio/x-vorbis': self.add_oggvorbis_encoder,
            'audio/x-flac': self.add_flac_encoder,
            'audio/x-wav': self.add_wav_encoder,
            'audio/mpeg': self.add_mp3_encoder,
            'audio/x-m4a': self.add_aac_encoder,
            'audio/ogg; codecs=opus': self.add_opus_encoder,
            'gst-profile': self.add_audio_profile,
        }
        self.add_command('audiorate tolerance=10000000')
        self.add_command('audioconvert')
        self.add_command('audioresample')

        # audio resampling support
        if self.output_resample:
            self.add_command('audio/x-raw-int,rate=%d' % self.resample_rate)
            self.add_command('audioconvert')
            self.add_command('audioresample')

        if self.force_mono:
            self.add_command('audio/x-raw-int,channels=1')
            self.add_command('audioconvert')

        encoder = self.encoders[self.output_type]()
        if not encoder:
            # TODO: is this used ?
            # TODO: add proper error management when an encoder cannot be created
            show_error(_('Error', "Cannot create a decoder for \'%s\' format.") % 
                        self.output_type)
            return

        self.add_command(encoder)

        uri = gnomevfs.URI(self.output_filename)
        dirname = uri.parent
        if dirname and not gnomevfs.exists(dirname):
            log('Creating folder: \'%s\'' % dirname)
            if not vfs_makedirs(str(dirname)):
                show_error('Error', _("Cannot create \'%s\' folder.") % dirname)
                return

        self.add_command('%s location="%s"' % (
            gstreamer_sink, encode_filename(self.output_filename)))

    def aborted(self):
        # remove partial file
        try:
            gnomevfs.unlink(self.output_filename)
        except:
            log('cannot delete: \'%s\'' % beautify_uri(self.output_filename))
        return

    def finished(self):
        Pipeline.finished(self)

        # Copy file permissions
        try:
            info = gnomevfs.get_file_info(self.sound_file.uri,
                                        gnomevfs.FILE_INFO_FIELDS_PERMISSIONS)
            gnomevfs.set_file_info(self.output_filename, info,
                                            gnomevfs.SET_FILE_INFO_PERMISSIONS)
        except:
            log('Cannot set permission on \'%s\'' %
                        gnomevfs.format_uri_for_display(self.output_filename))

        if self.delete_original and self.processing and not self.error:
            log('deleting: \'%s\'' % self.sound_file.uri)
            try:
                vfs_unlink(self.sound_file.uri)
            except:
                log('Cannot remove \'%s\'' %
                        gnomevfs.format_uri_for_display(self.output_filename))

    def on_error(self, err):
        #pass
        self.error = err
        show_error('<b>%s</b>' % _('GStreamer Error:'), '%s\n<i>(%s)</i>' % (err,
                    self.sound_file.filename_for_display))

    def set_vorbis_quality(self, quality):
        self.vorbis_quality = quality

    def set_aac_quality(self, quality):
        self.aac_quality = quality

    def set_opus_quality(self, quality):
        self.opus_quality = quality

    def set_mp3_mode(self, mode):
        self.mp3_mode = mode

    def set_mp3_quality(self, quality):
        self.mp3_quality = quality

    def set_flac_compression(self, compression):
        self.flac_compression = compression

    def set_wav_sample_width(self, sample_width):
        self.wav_sample_width = sample_width

    def set_audio_profile(self, audio_profile):
        self.audio_profile = audio_profile

    def add_flac_encoder(self):
        s = 'flacenc mid-side-stereo=true quality=%s' % self.flac_compression
        return s

    def add_wav_encoder(self):
        return 'audio/x-raw-int,width=%d ! wavenc' % (
                self.wav_sample_width)

    def add_oggvorbis_encoder(self):
        cmd = 'vorbisenc'
        if self.vorbis_quality is not None:
            cmd += ' quality=%s' % self.vorbis_quality
        cmd += ' ! oggmux '
        return cmd

    def add_mp3_encoder(self):
        cmd = 'lamemp3enc encoding-engine-quality=2 '

        if self.mp3_mode is not None:
            properties = {
                'cbr' : 'target=bitrate cbr=true bitrate=%s ',
                'abr' : 'target=bitrate cbr=false bitrate=%s ',
                'vbr' : 'target=quality cbr=false quality=%s ',
            }

            cmd += properties[self.mp3_mode] % self.mp3_quality

            if 'xingmux' in available_elements and properties[self.mp3_mode][0]:
                # add xing header when creating VBR mp3
                cmd += '! xingmux '

        if 'id3v2mux' in available_elements:
            # add tags
            cmd += '! id3v2mux '

        return cmd

    def add_aac_encoder(self):
        return 'faac bitrate=%s ! mp4mux' % (self.aac_quality * 1000)

    def add_opus_encoder(self):
        return 'opusenc bitrate=%s ! oggmux' % (self.opus_quality * 1000)

    def add_audio_profile(self):
        pipeline = audio_profiles_dict[self.audio_profile][2]
        return pipeline


class ConverterQueue(TaskQueue):

    """Background task for converting many files."""

    def __init__(self, window):
        TaskQueue.__init__(self)
        self.window = window
        self.reset_counters()

    def reset_counters(self):
        self.total_duration = 0
        self.duration_processed = 0
        self.errors = []
        self.error_count = 0
        self.all_tasks = None
        global user_canceled_codec_installation
        user_canceled_codec_installation = True

    def add(self, sound_file):
        # generate a temporary filename from source name and output suffix
        output_filename = self.window.prefs.generate_temp_filename(sound_file) + '~SC~'

        if vfs_exists(output_filename):
            # always overwrite temporary files
            vfs_unlink(output_filename)
        
        c = Converter(sound_file, output_filename,
                        self.window.prefs.get_string('output-mime-type'),
                        self.window.prefs.get_int('delete-original'),
                        self.window.prefs.get_int('output-resample'),
                        self.window.prefs.get_int('resample-rate'),
                        self.window.prefs.get_int('force-mono'),
                        )
        c.set_vorbis_quality(self.window.prefs.get_float('vorbis-quality'))
        c.set_aac_quality(self.window.prefs.get_int('aac-quality'))
        c.set_opus_quality(self.window.prefs.get_int('opus-bitrate'))
        c.set_flac_compression(self.window.prefs.get_int('flac-compression'))
        c.set_wav_sample_width(self.window.prefs.get_int('wav-sample-width'))
        c.set_audio_profile(self.window.prefs.get_string('audio-profile'))

        quality = {
            'cbr': 'mp3-cbr-quality',
            'abr': 'mp3-abr-quality',
            'vbr': 'mp3-vbr-quality'
        }
        mode = self.window.prefs.get_string('mp3-mode')
        c.set_mp3_mode(mode)
        c.set_mp3_quality(self.window.prefs.get_int(quality[mode]))
        c.init()
        c.add_listener('finished', self.on_task_finished)
        self.add_task(c)

    def get_progress(self, per_file_progress):
        tasks = self.running_tasks

        # try to get all tasks durations
        if not self.all_tasks:
            self.all_tasks = []
            self.all_tasks.extend(self.waiting_tasks)
            self.all_tasks.extend(self.running_tasks)

        for task in self.all_tasks:
            if task.sound_file.duration is None:
                duration = task.get_duration()
                if duration:
                    self.total_duration += duration

        position = 0.0
        prolist = []
        for task in range(self.finished_tasks): # TODO: use the add, luke
            prolist.append(1.0)
        for task in tasks:
            if task.running:
                position += task.get_position()
                taskprogress = float(task.get_position()) / task.sound_file.duration if task.sound_file.duration else 0
                taskprogress = min(max(taskprogress, 0.0), 1.0)
                prolist.append(taskprogress)
                per_file_progress[task.sound_file] = taskprogress
        for task in self.waiting_tasks:
            prolist.append(0.0)

        progress = sum(prolist)/len(prolist) if prolist else 0
        progress = min(max(progress, 0.0), 1.0)
        return self.running or len(self.all_tasks), progress

    def on_task_finished(self, task):
        task.sound_file.progress = 1.0
        
        if task.error:
            debug('error in task, skipping rename:', task.output_filename)
            if vfs_exists(task.output_filename):
                vfs_unlink(task.output_filename)
            self.errors.append(task.error)
            self.error_count += 1
            return
            
        duration = task.get_duration()
        if duration:
            self.duration_processed += duration

        # rename temporary file 
        newname = self.window.prefs.generate_filename(task.sound_file)
        log(beautify_uri(task.output_filename), '->', beautify_uri(newname))
        
        # safe mode. generate a filename until we find a free one
        p,e = os.path.splitext(newname)
        p = p.replace('%', '%%')
        p = p + ' (%d)' + e
        i = 1
        while vfs_exists(newname):
            newname = p % i
            i += 1
        
        task.error = vfs_rename(task.output_filename, newname)
        if task.error:
            self.errors.append(task.error)
            self.error_count += 1

    def finished(self):
        # This must be called with emit_async
        if self.running_tasks:
            raise RuntimeError
        TaskQueue.finished(self)
        self.window.set_sensitive()
        self.window.conversion_ended()
        total_time = self.run_finish_time - self.run_start_time
        msg = _('Conversion done in %s') % self.format_time(total_time)
        if self.error_count:
            msg += ', %d error(s)' % self.error_count
        self.window.set_status(msg)
        if not self.window.is_active():
            notification(msg) # this must move
        self.reset_counters()

    def format_time(self, seconds):
        units = [(86400, 'd'),
                 (3600, 'h'),
                 (60, 'm'),
                 (1, 's')]
        seconds = round(seconds)
        result = []
        for factor, unity in units:
            count = int(seconds / factor)
            seconds -= count * factor
            if count > 0 or (factor == 1 and not result):
                result.append('%d %s' % (count, unity))
        assert seconds == 0
        return ' '.join(result)

    def abort(self):
        TaskQueue.abort(self)
        self.window.set_sensitive()
        self.reset_counters()