#UI and logic for generation of AVI file from bunch of images
#it knows from director bean class where images are stored (there is also a list file
#containing list of images that will be frames - needed for transcode) and it create
#thread to call transcode.

#Limitations: user can destroy dialog, but it will not destroy transcode process!?

from __future__ import generators

import gtk
import gobject
import os
import re
from threading import *

from fract4d import animation

class AVIGeneration:
    def __init__(self,animation):
        self.dialog=gtk.Dialog("Generating AVI file...",None,
                    gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT,(gtk.STOCK_CANCEL,gtk.RESPONSE_CANCEL))
        self.pbar = gtk.ProgressBar()
        self.pbar.set_text("Please wait...")
        self.dialog.vbox.pack_start(self.pbar,True,True,0)
        self.dialog.set_geometry_hints(None,min_aspect=3.5,max_aspect=3.5)
        self.animation=animation
        self.delete_them=-1

    def generate_avi(self):
        #-------getting all needed information------------------------------
        folder_png=self.animation.get_png_dir()
        if folder_png[-1]!="/":
            folder_png=folder_png+"/"

        avi_file=self.animation.get_avi_file()
        width=self.animation.get_width()
        height=self.animation.get_height()
        framerate=self.animation.get_framerate()
        yield True
        #------------------------------------------------------------------

        try:
            if self.running==False:
                yield False
                return

            if not(os.path.exists(folder_png+"list")):#check if image listing already exist
                gtk.threads_enter()
                error_dlg = gtk.MessageDialog(
                    self.dialog,
                    gtk.DIALOG_MODAL  | gtk.DIALOG_DESTROY_WITH_PARENT,
                    gtk.MESSAGE_ERROR, gtk.BUTTONS_OK,
                    "In directory: %s there is no listing file. Cannot continue" %(folder_png))
                response=error_dlg.run()
                error_dlg.destroy()
                gtk.threads_leave()
                event = gtk.gdk.Event(gtk.gdk.DELETE)
                self.dialog.emit('delete_event', event)
                yield False
                return
            
            #--------calculating total number of frames------------
            count=self.animation.get_total_frames()
            #------------------------------------------------------
            #calling transcode
            swap=""
            if self.animation.get_redblue():
                swap="-k"

            call="transcode -z -i %slist -x imlist,null -g %dx%d -y ffmpeg,null -F mpeg4 -f %d -o %s -H 0 --use_rgb %s 2>/dev/null"%(folder_png,width,height,framerate,avi_file,swap)
            dt=DummyThread(call,self.pbar,float(count))
            dt.start()

            working=True
            while(working):
                dt.join(0.5) #refresh gtk every 0.5 seconds
                working=dt.isAlive()
                yield True

            if self.running==False:
                yield False
                return
            yield True
        except Exception, err:
            self.running=False
            self.error=True
            gtk.threads_enter()
            error_dlg = gtk.MessageDialog(self.dialog,gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT,
                    gtk.MESSAGE_ERROR, gtk.BUTTONS_OK,
                    _("Error during generation of avi file: %s" % err))
            error_dlg.run()
            error_dlg.destroy()
            gtk.threads_leave()
            event = gtk.gdk.Event(gtk.gdk.DELETE)
            self.dialog.emit('delete_event', event)
            yield False
            return
        if self.running==False:
            yield False
            return
        self.running=False
        self.dialog.destroy()
        yield False


    def show(self):
        #---------checking if there are transcode in PATH------------
        found=False
        env=os.environ['PATH']
        for d in env.split(':'):
            if found:
                break
            if 'transcode' in os.listdir(d):
                found=True
        if not found:
            gtk.threads_enter()
            error_dlg = gtk.MessageDialog(self.dialog,gtk.DIALOG_MODAL | gtk.DIALOG_DESTROY_WITH_PARENT,
                    gtk.MESSAGE_ERROR, gtk.BUTTONS_OK,
                    "transcode not found in PATH. Make sure you installed it. I will not continue")
            error_dlg.run()
            error_dlg.destroy()
            gtk.threads_leave()
            self.dialog.destroy()
            return -1
        #------------------------------------------------------------
        self.dialog.show_all()
        self.running=True
        self.error=False
        task=self.generate_avi()
        gobject.idle_add(task.next)
        response = self.dialog.run()
        if response != gtk.RESPONSE_CANCEL:
            if self.running==True: #destroy by user
                self.running=False
                self.dialog.destroy()
                return 1
            else:
                if self.error==True: #error
                    self.dialog.destroy()
                    return -1
                else: #everything ok
                    self.dialog.destroy()
                    return 0
        else: #cancel pressed
            self.running=False
            self.dialog.destroy()
            return 1

#thread for calling transcode
class DummyThread(Thread):
    def __init__(self,s,pbar,count):
        Thread.__init__(self)
        self.s=s
        self.pbar=pbar
        self.count=count

    def run(self):
        #os.system(self.s) <----this is little faster, but user can't see any progress
        reg=re.compile("\[.*-.*\]")
        pipe=os.popen(self.s)
        for line in pipe:
            m=reg.search(line)
            if m!=None:
                cur=re.split("-",m.group())[1][0:-1]
                self.pbar.set_fraction(float(cur)/self.count)
        return