"""
    Flowblade Movie Editor is a nonlinear video editor.
    Copyright 2012 Janne Liljeblad.

    This file is part of Flowblade Movie Editor <http://code.google.com/p/flowblade>.

    Flowblade Movie Editor 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.

    Flowblade Movie Editor 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 Flowblade Movie Editor. If not, see <http://www.gnu.org/licenses/>.
"""
try:
    import pgi
    pgi.install_as_gi()
except ImportError:
    pass
    
import gi

gi.require_version('Gtk', '3.0')
from gi.repository import GLib
    
import dbus
import dbus.service
from dbus.mainloop.glib import DBusGMainLoop
import locale
try:
    import mlt7 as mlt
except:
    import mlt
import os
import subprocess
import sys
import threading
import time

import appconsts
import atomicfile
import editorstate
import mltinit
import mltprofiles
import editorpersistance
import processutils
import renderconsumer
import respaths
import translations
import userfolders


TLINE_RENDER_ENCODING_INDEX = 0
RENDERING_PAD_FRAMES = 3

_dbus_service = None


# --------------------------------------------------------------- interface
def launch_render_server():
    bus = dbus.SessionBus()
    if bus.name_has_owner('io.github.jliljebl.Flowblade'):
        # This happens for project profile changes e.g. when loading first video and changing to matching peofile.
        # We are only running on of these per project edit session, so do nothing.
        print("io.github.jliljebl.Flowblade dbus service already exists")
    else:
        print("Launching io.github.jliljebl.Flowblade dbus service")
        FLOG = open(userfolders.get_cache_dir() + "log_tline_render", 'w')
        subprocess.Popen([sys.executable, respaths.LAUNCH_DIR + "flowbladetlinerender"], stdin=FLOG, stdout=FLOG, stderr=FLOG)

def render_update_clips(sequence_xml_path, segments_paths, segments_ins, segments_outs, profile_name):
    iface = _get_iface("render_update_clips")
    if iface != None:
        iface.render_update_clips(sequence_xml_path, segments_paths, segments_ins, segments_outs, profile_name)

def get_render_status():
    iface = _get_iface("get_render_status")
    if iface != None:
        return iface.get_render_status()

def abort_current_renders():
    iface = _get_iface("abort_current_renders")
    if iface != None:
        iface.abort_renders()
        
def shutdown_render_server():
    iface = _get_iface("shutdown_render_server")
    if iface != None:
        iface.shutdown_render_server()

def get_encoding_extension():
    return renderconsumer.proxy_encodings[TLINE_RENDER_ENCODING_INDEX].extension

def _get_iface(method_name):
    bus = dbus.SessionBus()
    if bus.name_has_owner('io.github.jliljebl.Flowblade'):
        obj = bus.get_object('io.github.jliljebl.Flowblade', '/io/github/jliljebl/Flowblade')
        iface = dbus.Interface(obj, 'io.github.jliljebl.Flowblade')
        return iface
    else:
        print("Timeline background render service not available on DBus at", method_name)
        # TODO: User infp.
        return None


# ---------------------------------------------------------------- server
def main(root_path, force_launch=False):
    try:
        editorstate.mlt_version = mlt.LIBMLT_VERSION
    except:
        editorstate.mlt_version = "0.0.99" # magic string for "not found"

    # Get XDG paths etc.
    userfolders.init()
    
    # Set paths.
    respaths.set_paths(root_path)

    # Load editor prefs and list of recent projects
    editorpersistance.load()
    
    # Init MLT
    repo = mltinit.init_with_translations()
    
    # Launch server
    DBusGMainLoop(set_as_default=True)
    loop = GLib.MainLoop()
    global _dbus_service
    _dbus_service = TLineRenderDBUSService(loop)
    loop.run()


class TLineRenderDBUSService(dbus.service.Object):
    def __init__(self, loop):
        bus_name = dbus.service.BusName('io.github.jliljebl.Flowblade', bus=dbus.SessionBus())
        dbus.service.Object.__init__(self, bus_name, '/io/github/jliljebl/Flowblade')
        self.main_loop = loop

        self.render_runner_thread = None
        
    @dbus.service.method('io.github.jliljebl.Flowblade')
    def render_update_clips(self, sequence_xml_path, segments_paths, segments_ins, segments_outs, profile_name):
        
        segments = []
        for i in range(0, len(segments_paths)):
            clip_path = segments_paths[i]
            clip_range_in = segments_ins[i]
            clip_range_out = segments_outs[i]
            segments.append((clip_path, clip_range_in, clip_range_out))

        self.render_runner_thread = TLineRenderRunnerThread(self, sequence_xml_path, segments, profile_name)
        self.render_runner_thread.start()

    @dbus.service.method('io.github.jliljebl.Flowblade')
    def get_render_status(self):
        dummy_list = ["nothing"]
        if self.render_runner_thread == None:
            return ("none", 0.0,  False, dummy_list)
        
        if self.render_runner_thread.render_complete:
            return ("none", 1.0, self.render_runner_thread.render_complete, self.render_runner_thread.completed_segments)
        
        if self.render_runner_thread.current_render_file_path == None:
            return ("none", 0.0,  False, dummy_list)
                  
        return ( self.render_runner_thread.current_render_file_path, self.render_runner_thread.get_fraction(), 
                  self.render_runner_thread.render_complete, self.render_runner_thread.completed_segments)

    @dbus.service.method('io.github.jliljebl.Flowblade')
    def abort_renders(self):

        if self.render_runner_thread == None:
            return
        
        self.render_runner_thread.abort()
        while self.render_runner_thread.render_complete == False:
            time.sleep(0.1)

        return

    @dbus.service.method('io.github.jliljebl.Flowblade')
    def shutdown_render_server(self):
        self.remove_from_connection()
        self.main_loop.quit()



# --------------------------------------------------------------------- rendering
class TLineRenderRunnerThread(threading.Thread):
    """
    SINGLE THREADED RENDERING, SHOULD WE GET MULTIPLE PROCESSES GOING FOR MULTIPLE CLIPS AT THE SAME TIME IN MODERN MULTICORE MACHINES?
    """
    def __init__(self, dbus_service, sequence_xml_path, segments, profile_name):
        threading.Thread.__init__(self)
        
        self.dbus_service = dbus_service
        self.sequence_xml_path = sequence_xml_path
        self.render_folder = os.path.dirname(sequence_xml_path)
        self.current_render_file_path = None
        self.profile = mltprofiles.get_profile(profile_name)
        self.segments = segments
        self.completed_segments =  ["nothing"]
        self.render_complete = False
        self.render_thread = None

        self.aborted = False

    def run(self):
        editorpersistance.load() # to apply possible chnages on timeline rendering
        
        start_time = time.monotonic()
 
        width, height = _get_render_dimensions(self.profile, editorpersistance.prefs.tline_render_size)
        encoding = _get_render_encoding()
        self.render_profile = _get_render_profile(self.profile, editorpersistance.prefs.tline_render_size, self.render_folder)
        
        self.current_render_file_path = None
        
        sequence_xml_producer = mlt.Producer(self.profile, str(self.sequence_xml_path))
        
        for segment in self.segments:
            if self.aborted == True:
                break
                
            clip_file_path, clip_range_in, clip_range_out = segment

            # Create render objects
            self.current_render_file_path = clip_file_path
            renderconsumer.performance_settings_enabled = False
            
            consumer = renderconsumer.get_render_consumer_for_encoding( clip_file_path,
                                                                        self.render_profile, 
                                                                        encoding)
            renderconsumer.performance_settings_enabled = True
            
            # We are using proxy file rendering code here mostly, didn't change all names.
            # Bit rates for proxy files are counted using 2500kbs for 
            # PAL size image as starting point.
            pal_pix_count = 720.0 * 576.0
            pal_proxy_rate = 2500.0
            proxy_pix_count = float(width * height)
            proxy_rate = pal_proxy_rate * (proxy_pix_count / pal_pix_count)
            proxy_rate = int(proxy_rate / 100) * 100 # Make proxy rate even hundred
            # There are no practical reasons to have bitrates lower than 500kbs.
            if proxy_rate < 500:
                proxy_rate = 500
            consumer.set("vb", str(int(proxy_rate)) + "k")

            consumer.set("rescale", "nearest")

            start_frame = clip_range_in 
            
            stop_frame = clip_range_out + RENDERING_PAD_FRAMES
            if stop_frame > sequence_xml_producer.get_length() - 1:
                stop_frame = sequence_xml_producer.get_length() - 1

            # Create and launch render thread
            self.render_thread = renderconsumer.FileRenderPlayer(None, sequence_xml_producer, consumer, start_frame, stop_frame)
            self.render_thread.wait_for_producer_end_stop = False
            self.render_thread.start()

            # Render view update loop
            self.render_in_progress = True
            self.aborted = False
            while self.render_in_progress:
                if self.aborted == True:
                    break

                if self.render_thread.running == False: # Rendering has reached end
                    self.render_in_progress = False
                    self.current_render_file_path = None
                else:
                    time.sleep(0.1)

            if self.aborted:
                self.render_thread.shutdown()
                break

            self.completed_segments.append(clip_file_path)

            self.render_thread.shutdown()
        
        self.render_complete = True
        print("tline render done, time:", time.monotonic() - start_time)

    def get_fraction(self):
        # Sometimes we get request for status before rendering has advanced enough to create the actual render thread.
        if self.render_thread == None:
            return 0.0
    
        return self.render_thread.get_render_fraction()

    def abort(self):
        self.render_thread.shutdown()
        self.aborted = True
        self.thread_running = False


def _get_render_encoding():
    return renderconsumer.proxy_encodings[editorpersistance.prefs.tline_render_encoding]

def _get_render_dimensions(project_profile, proxy_size):
    # Get new dimension that are about half of previous and diviseble by eight
    if proxy_size == appconsts.PROXY_SIZE_FULL:
        size_mult = 1.0
    elif proxy_size == appconsts.PROXY_SIZE_HALF:
        size_mult = 0.5
    else: # quarter size
        size_mult = 0.25

    old_width_half = int(project_profile.width() * size_mult)
    old_height_half = int(project_profile.height() * size_mult)
    new_width = old_width_half - old_width_half % 2
    new_height = old_height_half - old_height_half % 2
    return (new_width, new_height)

def _get_render_profile(project_profile, render_size, render_folder):
    new_width, new_height = _get_render_dimensions(project_profile, render_size)
    
    file_contents = "description=" + "proxy render profile" + "\n"
    file_contents += "frame_rate_num=" + str(project_profile.frame_rate_num()) + "\n"
    file_contents += "frame_rate_den=" + str(project_profile.frame_rate_den()) + "\n"
    file_contents += "width=" + str(new_width) + "\n"
    file_contents += "height=" + str(new_height) + "\n"
    file_contents += "progressive=1" + "\n"
    file_contents += "sample_aspect_num=" + str(project_profile.sample_aspect_num()) + "\n"
    file_contents += "sample_aspect_den=" + str(project_profile.sample_aspect_den()) + "\n"
    file_contents += "display_aspect_num=" + str(project_profile.display_aspect_num()) + "\n"
    file_contents += "display_aspect_den=" + str(project_profile.display_aspect_den()) + "\n"

    render_profile_path = render_folder + "/temp_render_profile"
        
    with atomicfile.AtomicFileWriter(render_profile_path, "w") as afw:
        profile_file = afw.get_file()
        profile_file.write(file_contents)

    render_profile = mlt.Profile(render_profile_path)
    return render_profile

