#!/usr/bin/env python

import sys, locale
import pygtk
pygtk.require("2.0")
import gtk
import Moosic
TRUE = 1
FALSE = 0

# Set the locale
locale.setlocale(locale.LC_ALL, '')

# Instantiate a Moosic client object for controlling the Moosic server.
moosic = Moosic.MoosicClient()

# Create the main window.
window = gtk.Window(gtk.WINDOW_TOPLEVEL)
window.connect("destroy", gtk.mainquit) # quit the event loop on destruction
window.set_border_width(3)
window.set_default_size(500, 300)
window.set_title("Moosic Song Queue")

# Create a horizontal box to hold most of the app's widgets.
vbox = gtk.VBox(FALSE, 3)
window.add(vbox)

# Create a menu bar.
accel_group = gtk.AccelGroup()
menu_items = (
    # path,         accel,        callback,     param, type
    ("/_File",      None,         None,         0,     "<Branch>"),
    ("/File/_Quit", "<control>Q", gtk.mainquit, 0,     None),
)
menu_factory = gtk.ItemFactory(gtk.MenuBar, "<main>", accel_group)
menu_factory.create_items(menu_items)
vbox.pack_start(menu_factory.get_widget("<main>"), FALSE, TRUE, 0)
window.add_accel_group(accel_group)

# Create a label to display the currently playing song.
current_song_frame = gtk.Frame("Currently playing song")
current_song_label = gtk.Entry()
current_song_label.set_text(moosic.current())
current_song_label.set_editable(FALSE)
current_song_frame.add(current_song_label)
vbox.pack_start(current_song_frame, FALSE)

# Create a frame and a scrolled window to contain the song list.
songlist_frame = gtk.Frame("Contents of the song queue")
vbox.pack_start(songlist_frame)
scrolled_window = gtk.ScrolledWindow()
scrolled_window.set_policy(gtk.POLICY_AUTOMATIC, gtk.POLICY_AUTOMATIC)
songlist_frame.add(scrolled_window)

# Create a list to display the songs that are currently in the Moosic queue.
clist = gtk.CList(2)
clist.set_selection_mode(gtk.SELECTION_EXTENDED)
scrolled_window.add_with_viewport(clist)

# Create a button to print the current list selection to stdout for debugging
# purposes.
#selection_button = gtk.Button("Print Selection")
#def show_selection(widget, clist):
#    print "The current selection:", clist.selection
#selection_button.connect("clicked", show_selection, clist)
#vbox.pack_start(selection_button, FALSE)

# Refresh the data display every 0.5 seconds.
def refresh(clist, song_label):
    try:
        moosic.no_op()
    except:
        print "The Moosic server is not running!"
        # TODO: pop up a warning dialog box
        return FALSE
    def utf8(something):
        '''Converts something into a UTF8-encoded Unicode string.'''
        return unicode(something, locale.getlocale()[1]).encode('utf-8')
    current_song = utf8(moosic.current())
    # Don't bother refreshing the song label if it hasn't actually changed.
    if current_song != song_label.get_text():
        song_label.set_text(current_song)
    songlist = [utf8(x) for x in moosic.list()]
    # Don't bother refreshing the list if it hasn't actually changed.
    if songlist != [clist.get_text(row, 1) for row in range(clist.rows)]:
        clist.freeze()
        clist.clear()
        num = 0
        for item in songlist:
            clist.append([str(num), item])
            num += 1
        clist.set_column_width(0, clist.optimal_column_width(0))
        clist.set_column_width(1, clist.optimal_column_width(1))
        clist.thaw()
    return TRUE
gtk.timeout_add(500, refresh, clist, current_song_label)


# TODO: create a toolbar for commonly-used actions: skip, delete,
# TODO: add more entries to the menu
# - File
#   - Save playlist...
#   - Load playlist...
#   - Quit
# - Queue
#   - Skip to the next song
#   - Stop
#   - (Un)Pause
#   - Kill/Start the server
# - Add
#   - Add file or directory...
#   - Add playlist...
#   - Add literal string...
# - Remove
#   - Remove all items
#   - Remove selected items
#   - Remove by regexp...
# - Rearrange
#   - Sort
#   - Shuffle
#   - Reverse
# - Configuration
#   - Show config
#   - Reload config
#   - Edit config
# - Help (of course)
#   - Show version info (about)
# TODO: add drag'n'drop
# TODO: allow editing of an individual list item by double-clicking on it
# TODO: handle the case where the Moosic server isn't running.
# TODO (maybe, way in the future): add a slider for adjusting the soundcard's
#       volume.

window.show_all()
gtk.main()