#####################################################################
# -*- coding: iso-8859-1 -*-                                        #
#                                                                   #
# Frets on Fire                                                     #
# Copyright (C) 2006 Sami Kyöstilä                                  #
#                                                                   #
# 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., 51 Franklin Street, Fifth Floor, Boston,        #
# MA  02110-1301, USA.                                              #
#####################################################################

import pygame
from OpenGL.GL import *
from OpenGL.GLU import *
import math
import colorsys

from View import Layer
from Input import KeyListener
from Song import loadSong, createSong, Note, difficulties
from Guitar import Guitar, KEYS
from Camera import Camera
from Menu import Menu, Choice
from Language import _
import MainMenu
import Dialogs
import Player
import Theme
import Log
import shutil, os, struct, wave, tempfile
from struct import unpack

class Editor(Layer, KeyListener):
  """Song editor layer."""
  def __init__(self, engine, songName = None):
    self.engine      = engine
    self.time        = 0.0
    self.guitar      = Guitar(self.engine, editorMode = True)
    self.controls    = Player.Controls()
    self.camera      = Camera()
    self.pos         = 0.0
    self.snapPos     = 0.0
    self.scrollPos   = 0.0
    self.scrollSpeed = 0.0
    self.newNotes    = None
    self.newNotePos  = 0.0
    self.song        = None
    self.engine.loadSvgDrawing(self, "background", "editor.svg")
    self.modified    = False
    self.songName    = songName
    self.heldFrets   = set()
    
    mainMenu = [
      (_("Save Song"),                  self.save),
      (_("Set Song Name"),              self.setSongName),
      (_("Set Artist Name"),            self.setArtistName),
      (_("Set Beats per Minute"),       self.setBpm),
      (_("Estimate Beats per Minute"),  self.estimateBpm),
      (_("Set A/V delay"),              self.setAVDelay),
      (_("Set Cassette Color"),         self.setCassetteColor),
      (_("Set Cassette Label"),         self.setCassetteLabel),
      (_("Editing Help"),               self.help),
      (_("Quit to Main Menu"),          self.quit),
    ]
    self.menu = Menu(self.engine, mainMenu)

  def save(self):
    if not self.modified:
      Dialogs.showMessage(self.engine, _("There are no changes to save."))
      return
    
    def save():
      self.song.save()
      self.modified = False
      
    self.engine.resource.load(function = save)
    Dialogs.showLoadingScreen(self.engine, lambda: not self.modified, text = _("Saving..."))
    Dialogs.showMessage(self.engine, _("'%s' saved.") % self.song.info.name)
    
  def help(self):
    Dialogs.showMessage(self.engine, _("Editing keys: ") +
                                     _("Arrows - Move cursor, ") +
                                     _("Space - Play/pause song, ") +
                                     _("Enter - Make note (hold and move for long notes), ") +
                                     _("Delete - Delete note, ") +
                                     _("Page Up/Down - Change difficulty"))


  def setSongName(self):
    name = Dialogs.getText(self.engine, _("Enter Song Name"), self.song.info.name)
    if name:
      self.song.info.name = name
      self.modified = True
    
  def setArtistName(self):
    name = Dialogs.getText(self.engine, _("Enter Artist Name"), self.song.info.artist)
    if name:
      self.song.info.artist = name
      self.modified = True
    
  def setAVDelay(self):
    delay = Dialogs.getText(self.engine, _("Enter A/V delay in milliseconds"), unicode(self.song.info.delay))
    if delay:
      try:
        self.song.info.delay = int(delay)
        self.modified = True
      except ValueError:
        Dialogs.showMessage(self.engine, _("That isn't a number."))

  def setBpm(self):
    bpm = Dialogs.getText(self.engine, _("Enter Beats per Minute Value"), unicode(self.song.bpm))
    if bpm:
      try:
        self.song.setBpm(float(bpm))
        self.modified = True
      except ValueError:
        Dialogs.showMessage(self.engine, _("That isn't a number."))
  
  def estimateBpm(self):
    bpm = Dialogs.estimateBpm(self.engine, self.song, _("Tap the Space bar to the beat of the song. Press Enter when done or Escape to cancel."))
    if bpm is not None:
      self.song.setBpm(bpm)
      self.modified = True

  def setCassetteColor(self):
    if self.song.info.cassetteColor:
      color = Theme.colorToHex(self.song.info.cassetteColor)
    else:
      color = ""
    color = Dialogs.getText(self.engine, _("Enter cassette color in HTML (#RRGGBB) format."), color)
    if color:
      try:
        self.song.info.setCassetteColor(Theme.hexToColor(color))
        self.modified = True
      except ValueError:
        Dialogs.showMessage(self.engine, _("That isn't a color."))
        
  def setCassetteLabel(self):
    label = Dialogs.chooseFile(self.engine, masks = ["*.png"], prompt = _("Choose a 256x128 PNG format label image."))
    if label:
      songPath = self.engine.resource.fileName("songs", self.songName, writable = True)
      shutil.copyfile(label, os.path.join(songPath, "label.png"))
      self.modified = True

  def shown(self):
    self.engine.input.addKeyListener(self)

    if not self.songName:
      self.songName = Dialogs.chooseSong(self.engine)
    
    if not self.songName:
      self.engine.view.popLayer(self)
      return
    
    self.engine.resource.load(self, "song", lambda: loadSong(self.engine, self.songName, seekable = True))
    Dialogs.showLoadingScreen(self.engine, lambda: self.song, text = _("Loading song..."))

  def hidden(self):
    if self.song:
      self.song.stop()
    self.engine.input.removeKeyListener(self)
    self.engine.view.pushLayer(MainMenu.MainMenu(self.engine))

  def controlPressed(self, control):
    if not self.song:
      return
    
    if control == Player.UP:
      self.guitar.selectPreviousString()
    elif control == Player.DOWN:
      self.guitar.selectNextString()
    elif control == Player.LEFT:
      self.pos = self.snapPos - self.song.period / 4
    elif control == Player.RIGHT:
      self.pos = self.snapPos + self.song.period / 4
    elif control in KEYS:
      self.heldFrets.add(KEYS.index(control))
    elif control in [Player.ACTION1, Player.ACTION2]:
      self.newNotePos = self.snapPos
      # Add notes for the frets that are held down or for the selected string.
      if self.heldFrets:
        self.newNotes = [Note(f, self.song.period / 4) for f in self.heldFrets]
      else:
        self.newNotes = [Note(self.guitar.selectedString, self.song.period / 4)]
      self.modified   = True
      
  def controlReleased(self, control):
    if not self.song:
      return

    if control in [Player.ACTION1, Player.ACTION2] and self.newNotes and not self.heldFrets:
      self.newNotes = []
    elif control in KEYS:
      self.heldFrets.remove(KEYS.index(control))
      if not self.heldFrets and self.newNotes:
        self.newNotes = []

  def quit(self):
    self.engine.view.popLayer(self)
    self.engine.view.popLayer(self.menu)

  def keyPressed(self, key, unicode):
    c = self.engine.input.controls.getMapping(key)
    if c == Player.CANCEL:
      self.engine.view.pushLayer(self.menu)
    elif key == pygame.K_PAGEDOWN and self.song:
      d = self.song.difficulty
      v = difficulties.values()
      self.song.difficulty = v[(v.index(d) + 1) % len(v)]
    elif key == pygame.K_PAGEUP and self.song:
      d = self.song.difficulty
      v = difficulties.values()
      self.song.difficulty = v[(v.index(d) - 1) % len(v)]
    elif key == pygame.K_DELETE and self.song:
      # gather up all events that intersect the cursor and delete the ones on the selected string
      t1 = self.snapPos
      t2 = self.snapPos + self.song.period / 4
      e  = [(time, event) for time, event in self.song.track.getEvents(t1, t2) if isinstance(event, Note)]
      for time, event in e:
        if event.number == self.guitar.selectedString:
          self.song.track.removeEvent(time, event)
          self.modified = True
    elif key == pygame.K_SPACE and self.song:
      if self.song.isPlaying():
        self.song.stop()
      else:
        self.song.play(start = self.pos)
    c = self.controls.keyPressed(key)
    if c:
      self.controlPressed(c)
    return True

  def keyReleased(self, key):
    c = self.controls.keyReleased(key)
    if c:
      self.controlReleased(c)
    return True

  def run(self, ticks):
    self.time += ticks / 50.0

    if not self.song:
      return

    self.guitar.run(ticks, self.scrollPos, self.controls)
    
    if not self.song.isPlaying():
      if self.controls.getState(Player.RIGHT) and not self.controls.getState(Player.LEFT):
        self.pos += self.song.period * self.scrollSpeed
        self.scrollSpeed += ticks / 4096.0
      elif self.controls.getState(Player.LEFT) and not self.controls.getState(Player.RIGHT):
        self.pos -= self.song.period * self.scrollSpeed
        self.scrollSpeed += ticks / 4096.0
      else:
        self.scrollSpeed = 0
    else:
      self.pos = self.song.getPosition() - self.song.info.delay

    self.pos = max(0, self.pos)
    
    quarterBeat = int(self.pos / (self.song.period / 4) + .5)
    self.snapPos = quarterBeat * (self.song.period / 4)

    # note adding
    if self.newNotes:
      if self.snapPos < self.newNotePos:
        self.newNotes = []
      for note in self.newNotes:
        self.song.track.removeEvent(self.newNotePos, note)
        note.length = max(self.song.period / 4, self.snapPos - self.newNotePos)
        # remove all notes under the this new note
        oldNotes = [(time, event) for time, event in self.song.track.getEvents(self.newNotePos, self.newNotePos + note.length) if isinstance(event, Note)]
        for time, event in oldNotes:
          if event.number == note.number:
            self.song.track.removeEvent(time, event)
            if time < self.newNotePos:
              event.length = self.newNotePos - time
              self.song.track.addEvent(time, event)
        self.song.track.addEvent(self.newNotePos, note)

    if self.song.isPlaying():
      self.scrollPos = self.pos
    else:
      self.scrollPos = (self.scrollPos + self.snapPos) / 2.0

  def render(self, visibility, topMost):
    if not self.song:
      return
      
    v = 1.0 - ((1 - visibility) ** 2)
      
    # render the background    
    t = self.time / 100 + 34
    w, h, = self.engine.view.geometry[2:4]
    r = .5
    self.background.transform.reset()
    self.background.transform.translate(w / 2 + math.sin(t / 2) * w / 2 * r, h / 2 + math.cos(t) * h / 2 * r)
    self.background.transform.rotate(-t)
    self.background.transform.scale(math.sin(t / 8) + 2, math.sin(t / 8) + 2)
    self.background.draw()
      
    self.camera.target = ( 2, 0, 5.5)
    self.camera.origin = (-2, 9, 5.5)

    glMatrixMode(GL_PROJECTION)
    glLoadIdentity()
    gluPerspective(60, 4.0 / 3.0, 0.1, 1000)
    glMatrixMode(GL_MODELVIEW)
    glLoadIdentity()
    self.camera.apply()
    self.guitar.render(v, self.song, self.scrollPos, self.controls)
      
    self.engine.view.setOrthogonalProjection(normalize = True)
    font = self.engine.data.font

    try:
      Theme.setSelectedColor()

      w, h = font.getStringSize(" ")

      if self.song.isPlaying():
        status = _("Playing")
      else:
        status = _("Stopped")

      t = "%d.%02d'%03d" % (self.pos / 60000, (self.pos % 60000) / 1000, self.pos % 1000)
      font.render(t, (.05, .05 - h / 2))
      font.render(status, (.05, .05 + h / 2))
      font.render(unicode(self.song.difficulty), (.05, .05 + 3 * h / 2))

      Theme.setBaseColor()
      text = self.song.info.name + (self.modified and "*" or "")
      Dialogs.wrapText(font, (.5, .05 - h / 2), text)
    finally:
      self.engine.view.resetProjection()

class Importer(Layer):
  """
  Song importer.
  
  This importer needs two OGG tracks for the new song; one is the background track
  and the other is the guitar track. The importer will create a blank note and info files
  and copy the tracks under the data directory.
  """
  def __init__(self, engine):
    self.engine        = engine
    self.wizardStarted = False
    self.song          = None
    self.songName      = None

  def hidden(self):
    if self.songName:
      self.engine.view.pushLayer(Editor(self.engine, self.songName))
    else:
      self.engine.view.pushLayer(MainMenu.MainMenu(self.engine))

  def run(self, ticks):
    if self.wizardStarted:
      return
    self.wizardStarted = True

    name = ""
    while True:
      masks = ["*.ogg"]
      name  = Dialogs.getText(self.engine, prompt = _("Enter a name for the song."), text = name)

      if not name:
        self.engine.view.popLayer(self)
        return

      path = os.path.abspath(self.engine.resource.fileName("songs", name))
      if os.path.isdir(path):
        Dialogs.showMessage(self.engine, _("That song already exists."))
      else:
        break

    guitarTrack     = Dialogs.chooseFile(self.engine, masks = masks, prompt = _("Choose the Instrument Track (OGG format)."))
    
    if not guitarTrack:
      self.engine.view.popLayer(self)
      return
    
    backgroundTrack = Dialogs.chooseFile(self.engine, masks = masks, prompt = _("Choose the Background Track (OGG format) or press Escape to skip."))

    # Create the song
    loader = self.engine.resource.load(self, "song", lambda: createSong(self.engine, name, guitarTrack, backgroundTrack))
    Dialogs.showLoadingScreen(self.engine, lambda: self.song or loader.exception, text = _("Importing..."))
    
    if not loader.exception:
      self.songName = name
    self.engine.view.popLayer(self)

class ArkFile(object):
  """
  An interface to the ARK file format of Guitar Hero.

  The format of the archive and the index file was studied from
  Game Extractor by WATTO Studios.
  """
  def __init__(self, indexFileName, dataFileName):
    self.dataFileName = dataFileName
  
    # Read the available files from the index
    f = open(indexFileName, "rb")
    magic, version1, version2, arkSize, length = unpack("IIIII", f.read(5 * 4))

    Log.debug("Reading HDR file v%d.%d. Main archive is %d bytes." % (version1, version2, arkSize))

    # Read the name array
    fileNameData = f.read(length)
    fileNameCount, = unpack("I", f.read(4))
    fileNameOffsets = [unpack("I", f.read(4))[0] for i in range(fileNameCount)]

    # Read the pointers to the names
    names = []
    for i, offset in enumerate(fileNameOffsets):
      length = fileNameData[offset:].find("\x00") 
      fileName = fileNameData[offset:offset + length]
      names.append(fileName)
      
    # Read the file names themselves
    fileCount, = unpack("I", f.read(4))

    self.files = {}
    for i in range(fileCount):
      offset, fileIndex, dirIndex, length, null = unpack("IIIII", f.read(5 * 4))
      fullName = "%s/%s" % (names[dirIndex], names[fileIndex])
      self.files[fullName] = offset, length
      Log.debug("File: %s at offset %d, length %d bytes." % (fullName, offset, length)) 
    Log.debug("Archive contains %d files." % len(self.files))
    f.close()

  def openFile(self, name, mode = "rb"):
    offset, length = self.files[name]
    f = open(self.dataFileName, mode)
    f.seek(offset)
    return f

  def fileLength(self, name):
    offset, length = self.files[name]
    return length
  
  def extractFile(self, name, outputFile):
    f = self.openFile(name)
    length = self.fileLength(name)

    if type(outputFile) == str:
      out = open(outputFile, "wb")
    else:
      out = outputFile

    while length > 0:
      data = f.read(4096)
      data = data[:min(length, len(data))]
      length -= len(data)
      out.write(data)
    f.close()

    if type(outputFile) == str:
      out.close()

class GHImporter(Layer):
  """
  Guitar Hero(tm) song importer.

  This importer takes the original Guitar Hero PS2 DVD and extracts the songs from it.
  Thanks to Sami Vaarala for the initial implementation!
  """
  def __init__(self, engine):
    self.engine        = engine
    self.wizardStarted = False
    self.done          = False
    self.songs         = None
    self.statusText    = ""
    self.stageInfoText = ""
    self.stageProgress = 0.0

  def hidden(self):
    self.engine.view.pushLayer(MainMenu.MainMenu(self.engine))

  def decodeVgsStreams(self, vgsFile, length):
    Log.notice("Decompressing %d byte VGS file." % (length))
    
    # This decompressor is based on VAG-Depack by bITmASTER
    f = vgsFile
    
    c = [[           0.0,          0.0 ],
         [   60.0 / 64.0,          0.0 ],
         [  115.0 / 64.0, -52.0 / 64.0 ],
         [   98.0 / 64.0, -55.0 / 64.0 ],
         [  122.0 / 64.0, -60.0 / 64.0 ],
         [           0.0,          0.0 ],
         [           0.0,          0.0 ],
         [           0.0,          0.0 ]]

    class StreamDecoder:
      """XA ADPCM decoder"""
      def __init__(self):
        self.s_1     = 0.0
        self.s_2     = 0.0
        self.samples = [0.0] * 28

      def decode(self, block, predict_nr, shift_factor):
        for i in range(0, 28, 2):
          d = block[i >> 1]
          s = (d & 0xf) << 12
          if s & 0x8000:
            s = (s & 0xffff) - 0x10000
          self.samples[i] = float(s >> shift_factor)
          s = (d & 0xf0) << 8
          if s & 0x8000:
            s = (s & 0xffff) - 0x10000
          self.samples[i + 1] = float(s >> shift_factor)

        for i in range(28):
          self.samples[i] += self.s_1 * c[predict_nr][0] + self.s_2 * c[predict_nr][1]
          self.s_2 = self.s_1
          self.s_1 = self.samples[i]
          
        return self.samples

    maxStreams = 8
    streams    = [StreamDecoder() for i in range(maxStreams)]

    def byte(d):
      if len(d):
        return struct.unpack("b", d)[0]
      return 0

    startPos = f.tell()

    while True:
      self.stageProgress = float(f.tell() - startPos) / length
      
      d = f.read(1)
      if not d:
        break
      predict_nr   = byte(d)
      shift_factor = predict_nr & 0xf
      predict_nr >>= 4
      flags        = byte(f.read(1))
      
      if flags == 7 or flags < 0:
        break

      streamId     = flags % maxStreams
      block        = [byte(f.read(1)) for i in range(14)]
      samples      = streams[streamId].decode(block, predict_nr, shift_factor)
      yield (streamId, struct.pack("28h", *[max(min(int(d + .5), 32767), -32768) for d in samples]))
    
    f.close()

  def joinPcmFiles(self, pcmLeft, pcmRight, waveOut, sampleRate = 44100):
    pcmLeft  = open(pcmLeft, "rb")
    pcmRight = open(pcmRight, "rb")
    w = wave.open(waveOut, "w")
    w.setnchannels(2)
    w.setsampwidth(2)
    w.setframerate(sampleRate)

    pcmLeft.seek(0, 2)
    length = pcmLeft.tell()
    pcmLeft.seek(0)

    while length:
      self.stageProgress = float(pcmLeft.tell()) / length
      l = pcmLeft.read(2)
      r = pcmRight.read(2)
      if not l or not r:
        break
      w.writeframesraw(l + r)
    w.close()
    pcmLeft.close()
    pcmRight.close()

  def decodeVgsFile(self, vgsFile, length, outputSongOggFile, outputGuitarOggFile, outputRhythmOggFile, workPath):
    # Split the file into different tracks
    self.stageInfoText = _("Stage 1/8: Splitting VGS file")
    
    f         = vgsFile
    blockSize = 16

    header = f.read(0x80)
    magic, version = unpack("4si", header[:4 + 4])
    assert magic == "VgS!"
    header = header[4 + 4:]

    Log.debug("VGS version %d" % (version))

    streams = []
    for channels in range(16):
      rate, blocks = unpack("ii", header[:4 + 4])
      header = header[4 + 4:]
      if not rate or not blocks:
        break
      Log.debug("Stream %d: %d blocks at %d Hz" % (len(streams), blocks, rate))
      streams.append((rate, blocks))

    out = [open(os.path.join(workPath, "chan%d.pcm") % c, "wb") for c in range(channels)]

    for channel, data in self.decodeVgsStreams(vgsFile, length):
      if channel >= 0 and channel < len(out):
        out[channel].write(data)

    [o.close() for o in out]

    # Join the left and right tracks to stereo wave files
    Log.notice("Joining song and guitar tracks")
    songWaveFile   = os.path.join(workPath, "song.wav")
    guitarWaveFile = os.path.join(workPath, "guitar.wav")
    rhythmWaveFile = os.path.join(workPath, "rhythm.wav")

    self.stageInfoText = _("Stage 6/8: Joining song stereo tracks")
    self.joinPcmFiles(os.path.join(workPath, "chan0.pcm"),
                      os.path.join(workPath, "chan1.pcm"),
                      songWaveFile, sampleRate = streams[0][0])
    self.stageInfoText = _("Stage 7/8: Joining guitar stereo tracks")
    self.joinPcmFiles(os.path.join(workPath, "chan2.pcm"),
                      os.path.join(workPath, "chan3.pcm"),
                      guitarWaveFile, sampleRate = streams[2][0])

    if channels == 5:
      self.joinPcmFiles(os.path.join(workPath, "chan4.pcm"),
                        os.path.join(workPath, "chan4.pcm"),
                        rhythmWaveFile, sampleRate = streams[4][0])
    elif channels == 6:
      self.joinPcmFiles(os.path.join(workPath, "chan4.pcm"),
                        os.path.join(workPath, "chan5.pcm"),
                        rhythmWaveFile, sampleRate = streams[4][0])
 
    # Compress wave files
    self.stageInfoText = _("Stage 8/8: Compressing tracks")
    self.stageProgress = 0.0 / channels
    Log.notice("Compressing song and guitar tracks")
    self.compressWaveFileToOgg(songWaveFile,   outputSongOggFile)
    self.stageProgress = 2.0 / channels
    self.compressWaveFileToOgg(guitarWaveFile, outputGuitarOggFile)
    self.stageProgress = 4.0 / channels
    if channels in [5, 6]:
      self.compressWaveFileToOgg(rhythmWaveFile, outputRhythmOggFile)
      self.stageProgress = 6.0 / channels

    # Cleanup
    for chan in range(channels):
      os.unlink(os.path.join(workPath, "chan%d.pcm" % chan))
    os.unlink(songWaveFile)
    os.unlink(guitarWaveFile)

  def compressWaveFileToOgg(self, waveFile, oggFile):
    os.system('oggenc "%s" --resample 44100 -o "%s"' % (waveFile, oggFile))

  def isOggEncoderPresent(self):
    if os.name == "nt":
      return os.system("oggenc -h > NUL:") == 0
    return os.system("oggenc > /dev/null 2>&1") == 256

  def importSongs(self, headerPath, archivePath, workPath):
    try:
      try:
        os.mkdir(workPath)
      except:
        pass

      # Read the song map
      self.statusText = _("Reading the song list.")
      songMap = {}
      for line in open(self.engine.resource.fileName("ghmidimap.txt")):
        songName, fullName, artist = map(lambda s: s.strip(), line.strip().split(";"))
        songMap[songName] = (fullName, artist)

      self.statusText = _("Reading the archive index.")
      archive = ArkFile(headerPath, archivePath)
      songPath = self.engine.resource.fileName("songs", writable = True)
      songs    = []

      # Filter out the songs that aren't in this archive
      for songName, data in songMap.items():
        archiveVgsFile  = "songs/%s/%s.vgs" % (songName, songName)
        if not archiveVgsFile in archive.files:
          Log.warn("VGS file for song '%s' not found in this archive." % songName)
          del songMap[songName]
          continue
      
        if os.path.exists(os.path.join(songPath, songName)):
          Log.warn("Song '%s' already exists." % songName)
          del songMap[songName]
          continue
      
      for songName, data in songMap.items():
        fullName, artist = data

        Log.notice("Extracting song '%s'" % songName)
        self.statusText = _("Extracting %s by %s. %d of %d songs imported. Yeah, this is going to take forever.") % (fullName, artist, len(songs), len(songMap))
        
        archiveMidiFile = "songs/%s/%s.mid" % (songName, songName)
        archiveVgsFile  = "songs/%s/%s.vgs" % (songName, songName)
        
        # Check that the required files exist
        if not archiveMidiFile in archive.files:
          Log.warn("MIDI file for song '%s' not found." % songName)
          continue
        
        if not archiveVgsFile in archive.files:
          Log.warn("VGS file for song '%s' not found." % songName)
          continue

        # Debug dump
        #vgsFile       = archive.openFile(archiveVgsFile)
        #open("/tmp/test.vgs", "wb").write(vgsFile.read(archive.fileLength(archiveVgsFile)))
        
        # Grab the VGS file
        vgsFile       = archive.openFile(archiveVgsFile)
        vgsFileLength = archive.fileLength(archiveVgsFile)
        guitarOggFile = os.path.join(workPath, "guitar.ogg")
        songOggFile   = os.path.join(workPath, "song.ogg")
        rhythmOggFile = os.path.join(workPath, "rhythm.ogg")
        self.decodeVgsFile(vgsFile, vgsFileLength, songOggFile, guitarOggFile, rhythmOggFile, workPath)
        vgsFile.close()

        # Create the song
        if not os.path.isfile(rhythmOggFile):
          rhythmOggFile = None
        
        song = createSong(self.engine, songName, guitarOggFile, songOggFile, rhythmOggFile)
        song.info.name   = fullName.strip()
        song.info.artist = artist.strip()
        song.save()

        # Grab the MIDI file
        archive.extractFile(archiveMidiFile, os.path.join(songPath, songName, "notes.mid"))

        # Done with this song
        songs.append(songName)

      # Clean up
      shutil.rmtree(workPath)
        
      self.stageInfoText = _("Ready")
      self.stageProgress = 1.0
      Log.debug("Songs imported: " + ", ".join(songs))
      return songs
    except:
      self.done = True
      raise

  def run(self, ticks):
    if self.done == True or self.songs is not None:
      songs = self.songs
      self.songs = None
      self.done = None
      self.statusText = ""
      if songs:
        Dialogs.showMessage(self.engine, _("All done! %d songs imported. Have fun!") % (len(songs)))
      else:
        Dialogs.showMessage(self.engine, _("No songs could be imported, sorry. Check the log files for more information."))
      self.engine.view.popLayer(self)
    if self.wizardStarted:
      return
    self.wizardStarted = True

    # Check for necessary software
    if not self.isOggEncoderPresent():
      if os.name == "nt":
        Dialogs.showMessage(self.engine, _("Ogg Vorbis encoder (oggenc.exe) not found. Please install it to the game directory and try again."))
      else:
        Dialogs.showMessage(self.engine, _("Ogg Vorbis encoder (oggenc) not found. Please install it and try again."))
      self.engine.view.popLayer(self)
      return

    Dialogs.showMessage(self.engine, _("Make sure you have at least 500 megabytes of free disk space before using this importer."))

    path = ""
    while True:
      path = Dialogs.getText(self.engine, prompt = _("Enter the path to the mounted Guitar Hero (tm) DVD"), text = path)

      if not path:
        self.engine.view.popLayer(self)
        return

      headerPath  = os.path.join(path, "gen", "main.hdr")
      archivePath = os.path.join(path, "gen", "main_0.ark")
      if not os.path.isfile(headerPath) or not os.path.isfile(archivePath):
        Dialogs.showMessage(self.engine, _("That's not it. Try again."))
      else:
       break

    workPath = tempfile.mkdtemp("fretsonfire")
    self.engine.resource.load(self, "songs", lambda: self.importSongs(headerPath, archivePath, workPath))

  def render(self, visibility, topMost):
    v = (1 - visibility) ** 2
      
    self.engine.view.setOrthogonalProjection(normalize = True)
    font = self.engine.data.font

    try:
      w, h = font.getStringSize(" ")

      Theme.setSelectedColor()
      font.render(_("Importing Songs"), (.05, .05 - v))
      if self.stageInfoText:
        font.render("%s (%d%%)" % (self.stageInfoText, 100 * self.stageProgress), (.05, .7 + v), scale = 0.001)

      Theme.setBaseColor()
      Dialogs.wrapText(font, (.1, .3 + v), self.statusText)
    finally:
      self.engine.view.resetProjection()
