#!/usr/bin/env python3
#
# Timeline - very simple GES timeline wrapper
#
# Copyright (C) 2016  Antonio Ospite <ao2@ao2.it>
#
# 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 3 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, see <http://www.gnu.org/licenses/>.

import gi

gi.require_version('Gst', '1.0')
from gi.repository import Gst
Gst.init(None)

gi.require_version('GES', '1.0')
from gi.repository import GES
GES.init()

from .Player import Player


class Timeline(object):
    def __init__(self):
        self.project = GES.Project(extractable_type=GES.Timeline)
        self.timeline = GES.Asset.extract(self.project)

        audio_track = GES.AudioTrack.new()
        video_track = GES.VideoTrack.new()

        self.timeline.add_track(audio_track)
        self.timeline.add_track(video_track)

        self.layer = self.timeline.append_layer()

        ges_pipeline = GES.Pipeline()
        ges_pipeline.set_timeline(self.timeline)
        self.player = Player(ges_pipeline)

    def add_clip(self, clip_path, start_time, duration):
        clip_uri = Gst.filename_to_uri(clip_path)
        asset = GES.UriClipAsset.request_sync(clip_uri)
        self.layer.add_asset(asset, start_time * Gst.SECOND, 0,
                             duration * Gst.SECOND, GES.TrackType.UNKNOWN)

    def play(self):
        self.timeline.commit()
        self.player.play()

    def stop(self):
        self.player.stop()

    def save(self, path):
        uri = Gst.filename_to_uri(path)
        self.project.save(self.timeline, uri, None, False)