"""Main Pynche (Pythonically Natural Color and Hue Editor) widget.

This window provides the basic decorations, primarily including the menubar.
It is used to bring up other windows.
"""

import sys
import os
from tkinter import *
from tkinter import messagebox, filedialog
import ColorDB

# Milliseconds between interrupt checks
KEEPALIVE_TIMER = 500



class PyncheWidget:
 def __init__(self, version, switchboard, master=None, extrapath=[]):
 self.__sb = switchboard
 self.__version = version
 self.__textwin = None
 self.__listwin = None
 self.__detailswin = None
 self.__helpwin = None
 self.__dialogstate = {}
 modal = self.__modal = not not master
 # If a master was given, we are running as a modal dialog servant to
 # some other application. We rearrange our UI in this case (there's
 # no File menu and we get `Okay' and `Cancel' buttons), and we do a
 # grab_set() to make ourselves modal
 if modal:
 self.__tkroot = tkroot = Toplevel(master, class_='Pynche')
 tkroot.grab_set()
 tkroot.withdraw()
 else:
 # Is there already a default root for Tk, say because we're
 # running under Guido's IDE? :-) Two conditions say no, either the
 # import fails or _default_root is None.
 tkroot = None
 try:
 from Tkinter import _default_root
 tkroot = self.__tkroot = _default_root
 except ImportError:
 pass
 if not tkroot:
 tkroot = self.__tkroot = Tk(className='Pynche')
 # but this isn't our top level widget, so make it invisible
 tkroot.withdraw()
 # create the menubar
 menubar = self.__menubar = Menu(tkroot)
 #
 # File menu
 #
 filemenu = self.__filemenu = Menu(menubar, tearoff=0)
 filemenu.add_command(label='Load palette...',
 command=self.__load,
 underline=0)
 if not modal:
 filemenu.add_command(label='Quit',
 command=self.__quit,
 accelerator='Alt-Q',
 underline=0)
 #
 # View menu
 #
 views = make_view_popups(self.__sb, self.__tkroot, extrapath)
 viewmenu = Menu(menubar, tearoff=0)
 for v in views:
 viewmenu.add_command(label=v.menutext(),
 command=v.popup,
 underline=v.underline())
 #
 # Help menu
 #
 helpmenu = Menu(menubar, name='help', tearoff=0)
 helpmenu.add_command(label='About Pynche...',
 command=self.__popup_about,
 underline=0)
 helpmenu.add_command(label='Help...',
 command=self.__popup_usage,
 underline=0)
 #
 # Tie them all together
 #
 menubar.add_cascade(label='File',
 menu=filemenu,
 underline=0)
 menubar.add_cascade(label='View',
 menu=viewmenu,
 underline=0)
 menubar.add_cascade(label='Help',
 menu=helpmenu,
 underline=0)

 # now create the top level window
 root = self.__root = Toplevel(tkroot, class_='Pynche', menu=menubar)
 root.protocol('WM_DELETE_WINDOW',
 modal and self.__bell or self.__quit)
 root.title('Pynche %s' % version)
 root.iconname('Pynche')
 # Only bind accelerators for the File->Quit menu item if running as a
 # standalone app
 if not modal:
 root.bind('<Alt-q>', self.__quit)
 root.bind('<Alt-Q>', self.__quit)
 else:
 # We're a modal dialog so we have a new row of buttons
 bframe = Frame(root, borderwidth=1, relief=RAISED)
 bframe.grid(row=4, column=0, columnspan=2,
 sticky='EW',
 ipady=5)
 okay = Button(bframe,
 text='Okay',
 command=self.__okay)
 okay.pack(side=LEFT, expand=1)
 cancel = Button(bframe,
 text='Cancel',
 command=self.__cancel)
 cancel.pack(side=LEFT, expand=1)

 def __quit(self, event=None):
 self.__tkroot.quit()

 def __bell(self, event=None):
 self.__tkroot.bell()

 def __okay(self, event=None):
 self.__sb.withdraw_views()
 self.__tkroot.grab_release()
 self.__quit()

 def __cancel(self, event=None):
 self.__sb.canceled()
 self.__okay()

 def __keepalive(self):
 # Exercise the Python interpreter regularly so keyboard interrupts get
 # through.
 self.__tkroot.tk.createtimerhandler(KEEPALIVE_TIMER, self.__keepalive)

 def start(self):
 if not self.__modal:
 self.__keepalive()
 self.__tkroot.mainloop()

 def window(self):
 return self.__root

 def __popup_about(self, event=None):
 from Main import __version__
 messagebox.showinfo('About Pynche ' + __version__,
 '''\
Pynche %s
The PYthonically Natural
Color and Hue Editor

For information
contact: Barry A. Warsaw
email: bwarsaw@python.org''' % __version__)

 def __popup_usage(self, event=None):
 if not self.__helpwin:
 self.__helpwin = Helpwin(self.__root, self.__quit)
 self.__helpwin.deiconify()

 def __load(self, event=None):
 while 1:
 idir, ifile = os.path.split(self.__sb.colordb().filename())
 file = filedialog.askopenfilename(
 filetypes=[('Text files', '*.txt'),
 ('All files', '*'),
 ],
 initialdir=idir,
 initialfile=ifile)
 if not file:
 # cancel button
 return
 try:
 colordb = ColorDB.get_colordb(file)
 except IOError:
 messagebox.showerror('Read error', '''\
Could not open file for reading:
%s''' % file)
 continue
 if colordb is None:
 messagebox.showerror('Unrecognized color file type', '''\
Unrecognized color file type in file:
%s''' % file)
 continue
 break
 self.__sb.set_colordb(colordb)

 def withdraw(self):
 self.__root.withdraw()

 def deiconify(self):
 self.__root.deiconify()



class Helpwin:
 def __init__(self, master, quitfunc):
 from Main import docstring
 self.__root = root = Toplevel(master, class_='Pynche')
 root.protocol('WM_DELETE_WINDOW', self.__withdraw)
 root.title('Pynche Help Window')
 root.iconname('Pynche Help Window')
 root.bind('<Alt-q>', quitfunc)
 root.bind('<Alt-Q>', quitfunc)
 root.bind('<Alt-w>', self.__withdraw)
 root.bind('<Alt-W>', self.__withdraw)

 # more elaborate help is available in the README file
 readmefile = os.path.join(sys.path[0], 'README')
 try:
 fp = None
 try:
 fp = open(readmefile)
 contents = fp.read()
 # wax the last page, it contains Emacs cruft
 i = contents.rfind('\f')
 if i > 0:
 contents = contents[:i].rstrip()
 finally:
 if fp:
 fp.close()
 except IOError:
 sys.stderr.write("Couldn't open Pynche's README, "
 'using docstring instead.\n')
 contents = docstring()

 self.__text = text = Text(root, relief=SUNKEN,
 width=80, height=24)
 self.__text.focus_set()
 text.insert(0.0, contents)
 scrollbar = Scrollbar(root)
 scrollbar.pack(fill=Y, side=RIGHT)
 text.pack(fill=BOTH, expand=YES)
 text.configure(yscrollcommand=(scrollbar, 'set'))
 scrollbar.configure(command=(text, 'yview'))

 def __withdraw(self, event=None):
 self.__root.withdraw()

 def deiconify(self):
 self.__root.deiconify()



import functools
@functools.total_ordering
class PopupViewer:
 def __init__(self, module, name, switchboard, root):
 self.__m = module
 self.__name = name
 self.__sb = switchboard
 self.__root = root
 self.__menutext = module.ADDTOVIEW
 # find the underline character
 underline = module.ADDTOVIEW.find('%')
 if underline == -1:
 underline = 0
 else:
 self.__menutext = module.ADDTOVIEW.replace('%', '', 1)
 self.__underline = underline
 self.__window = None

 def menutext(self):
 return self.__menutext

 def underline(self):
 return self.__underline

 def popup(self, event=None):
 if not self.__window:
 # class and module must have the same name
 class_ = getattr(self.__m, self.__name)
 self.__window = class_(self.__sb, self.__root)
 self.__sb.add_view(self.__window)
 self.__window.deiconify()

 def __eq__(self, other):
 return self.__menutext == other.__menutext

 def __lt__(self, other):
 return self.__menutext < other.__menutext


def make_view_popups(switchboard, root, extrapath):
 viewers = []
 # where we are in the file system
 dirs = [os.path.dirname(__file__)] + extrapath
 for dir in dirs:
 if dir == '':
 dir = '.'
 for file in os.listdir(dir):
 if file[-9:] == 'Viewer.py':
 name = file[:-3]
 try:
 module = __import__(name)
 except ImportError:
 # Pynche is running from inside a package, so get the
 # module using the explicit path.
 pkg = __import__('pynche.'+name)
 module = getattr(pkg, name)
 if hasattr(module, 'ADDTOVIEW') and module.ADDTOVIEW:
 # this is an external viewer
 v = PopupViewer(module, name, switchboard, root)
 viewers.append(v)
 # sort alphabetically
 viewers.sort()
 return viewers