"""DetailsViewer class.

This class implements a pure input window which allows you to meticulously
edit the current color.  You have both mouse control of the color (via the
buttons along the bottom row), and there are keyboard bindings for each of the
increment/decrement buttons.

The top three check buttons allow you to specify which of the three color
variations are tied together when incrementing and decrementing.  Red, green,
and blue are self evident.  By tying together red and green, you can modify
the yellow level of the color.  By tying together red and blue, you can modify
the magenta level of the color.  By tying together green and blue, you can
modify the cyan level, and by tying all three together, you can modify the
grey level.

The behavior at the boundaries (0 and 255) are defined by the `At boundary'
option menu:

   Stop
       When the increment or decrement would send any of the tied variations
       out of bounds, the entire delta is discarded.

   Wrap Around
       When the increment or decrement would send any of the tied variations
       out of bounds, the out of bounds variation is wrapped around to the
       other side.  Thus if red were at 238 and 25 were added to it, red
       would have the value 7.

   Preseve Distance
       When the increment or decrement would send any of the tied variations
       out of bounds, all tied variations are wrapped as one, so as to
       preserve the distance between them.  Thus if green and blue were tied,
       and green was at 238 while blue was at 223, and an increment of 25
       were applied, green would be at 15 and blue would be at 0.

   Squash
       When the increment or decrement would send any of the tied variations
       out of bounds, the out of bounds variation is set to the ceiling of
       255 or floor of 0, as appropriate.  In this way, all tied variations
       are squashed to one edge or the other.

The following key bindings can be used as accelerators.  Note that Pynche can
fall behind if you hold the key down as a key repeat:

Left arrow == -1
Right arrow == +1

Control + Left == -10
Control + Right == 10

Shift + Left == -25
Shift + Right == +25
"""

from Tkinter import *

STOP = 'Stop'
WRAP = 'Wrap Around'
RATIO = 'Preserve Distance'
GRAV = 'Squash'

ADDTOVIEW = 'Details Window...'


class DetailsViewer:
   def __init__(self, switchboard, master=None):
       self.__sb = switchboard
       optiondb = switchboard.optiondb()
       self.__red, self.__green, self.__blue = switchboard.current_rgb()
       # GUI
       root = self.__root = Toplevel(master, class_='Pynche')
       root.protocol('WM_DELETE_WINDOW', self.withdraw)
       root.title('Pynche Details Window')
       root.iconname('Pynche Details Window')
       root.bind('<Alt-q>', self.__quit)
       root.bind('<Alt-Q>', self.__quit)
       root.bind('<Alt-w>', self.withdraw)
       root.bind('<Alt-W>', self.withdraw)
       # accelerators
       root.bind('<KeyPress-Left>', self.__minus1)
       root.bind('<KeyPress-Right>', self.__plus1)
       root.bind('<Control-KeyPress-Left>', self.__minus10)
       root.bind('<Control-KeyPress-Right>', self.__plus10)
       root.bind('<Shift-KeyPress-Left>', self.__minus25)
       root.bind('<Shift-KeyPress-Right>', self.__plus25)
       #
       # color ties
       frame = self.__frame = Frame(root)
       frame.pack(expand=YES, fill=X)
       self.__l1 = Label(frame, text='Move Sliders:')
       self.__l1.grid(row=1, column=0, sticky=E)
       self.__rvar = IntVar()
       self.__rvar.set(optiondb.get('RSLIDER', 4))
       self.__radio1 = Checkbutton(frame, text='Red',
                                   variable=self.__rvar,
                                   command=self.__effect,
                                   onvalue=4, offvalue=0)
       self.__radio1.grid(row=1, column=1, sticky=W)
       self.__gvar = IntVar()
       self.__gvar.set(optiondb.get('GSLIDER', 2))
       self.__radio2 = Checkbutton(frame, text='Green',
                                   variable=self.__gvar,
                                   command=self.__effect,
                                   onvalue=2, offvalue=0)
       self.__radio2.grid(row=2, column=1, sticky=W)
       self.__bvar = IntVar()
       self.__bvar.set(optiondb.get('BSLIDER', 1))
       self.__radio3 = Checkbutton(frame, text='Blue',
                                   variable=self.__bvar,
                                   command=self.__effect,
                                   onvalue=1, offvalue=0)
       self.__radio3.grid(row=3, column=1, sticky=W)
       self.__l2 = Label(frame)
       self.__l2.grid(row=4, column=1, sticky=W)
       self.__effect()
       #
       # Boundary behavior
       self.__l3 = Label(frame, text='At boundary:')
       self.__l3.grid(row=5, column=0, sticky=E)
       self.__boundvar = StringVar()
       self.__boundvar.set(optiondb.get('ATBOUND', STOP))
       self.__omenu = OptionMenu(frame, self.__boundvar,
                                 STOP, WRAP, RATIO, GRAV)
       self.__omenu.grid(row=5, column=1, sticky=W)
       self.__omenu.configure(width=17)
       #
       # Buttons
       frame = self.__btnframe = Frame(frame)
       frame.grid(row=0, column=0, columnspan=2, sticky='EW')
       self.__down25 = Button(frame, text='-25',
                              command=self.__minus25)
       self.__down10 = Button(frame, text='-10',
                              command=self.__minus10)
       self.__down1 = Button(frame, text='-1',
                             command=self.__minus1)
       self.__up1 = Button(frame, text='+1',
                           command=self.__plus1)
       self.__up10 = Button(frame, text='+10',
                            command=self.__plus10)
       self.__up25 = Button(frame, text='+25',
                            command=self.__plus25)
       self.__down25.pack(expand=YES, fill=X, side=LEFT)
       self.__down10.pack(expand=YES, fill=X, side=LEFT)
       self.__down1.pack(expand=YES, fill=X, side=LEFT)
       self.__up1.pack(expand=YES, fill=X, side=LEFT)
       self.__up10.pack(expand=YES, fill=X, side=LEFT)
       self.__up25.pack(expand=YES, fill=X, side=LEFT)

   def __effect(self, event=None):
       tie = self.__rvar.get() + self.__gvar.get() + self.__bvar.get()
       if tie in (0, 1, 2, 4):
           text = ''
       else:
           text = '(= %s Level)' % {3: 'Cyan',
                                    5: 'Magenta',
                                    6: 'Yellow',
                                    7: 'Grey'}[tie]
       self.__l2.configure(text=text)

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

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

   def deiconify(self, event=None):
       self.__root.deiconify()

   def __minus25(self, event=None):
       self.__delta(-25)

   def __minus10(self, event=None):
       self.__delta(-10)

   def __minus1(self, event=None):
       self.__delta(-1)

   def __plus1(self, event=None):
       self.__delta(1)

   def __plus10(self, event=None):
       self.__delta(10)

   def __plus25(self, event=None):
       self.__delta(25)

   def __delta(self, delta):
       tie = []
       if self.__rvar.get():
           red = self.__red + delta
           tie.append(red)
       else:
           red = self.__red
       if self.__gvar.get():
           green = self.__green + delta
           tie.append(green)
       else:
           green = self.__green
       if self.__bvar.get():
           blue = self.__blue + delta
           tie.append(blue)
       else:
           blue = self.__blue
       # now apply at boundary behavior
       atbound = self.__boundvar.get()
       if atbound == STOP:
           if red < 0 or green < 0 or blue < 0 or \
              red > 255 or green > 255 or blue > 255:
               # then
               red, green, blue = self.__red, self.__green, self.__blue
       elif atbound == WRAP or (atbound == RATIO and len(tie) < 2):
           if red < 0:
               red += 256
           if green < 0:
               green += 256
           if blue < 0:
               blue += 256
           if red > 255:
               red -= 256
           if green > 255:
               green -= 256
           if blue > 255:
               blue -= 256
       elif atbound == RATIO:
           # for when 2 or 3 colors are tied together
           dir = 0
           for c in tie:
               if c < 0:
                   dir = -1
               elif c > 255:
                   dir = 1
           if dir == -1:
               delta = max(tie)
               if self.__rvar.get():
                   red = red + 255 - delta
               if self.__gvar.get():
                   green = green + 255 - delta
               if self.__bvar.get():
                   blue = blue + 255 - delta
           elif dir == 1:
               delta = min(tie)
               if self.__rvar.get():
                   red = red - delta
               if self.__gvar.get():
                   green = green - delta
               if self.__bvar.get():
                   blue = blue - delta
       elif atbound == GRAV:
           if red < 0:
               red = 0
           if green < 0:
               green = 0
           if blue < 0:
               blue = 0
           if red > 255:
               red = 255
           if green > 255:
               green = 255
           if blue > 255:
               blue = 255
       self.__sb.update_views(red, green, blue)
       self.__root.update_idletasks()

   def update_yourself(self, red, green, blue):
       self.__red = red
       self.__green = green
       self.__blue = blue

   def save_options(self, optiondb):
       optiondb['RSLIDER'] = self.__rvar.get()
       optiondb['GSLIDER'] = self.__gvar.get()
       optiondb['BSLIDER'] = self.__bvar.get()
       optiondb['ATBOUND'] = self.__boundvar.get()

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