'''
 	Pythonista Forum - @Phuket2
'''
import ui, editor, bz2, base64
#_pyui_file_name = 'booking.pyui'

__pyui_str__ ='''
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'''

from collections import deque

class ViewWalker(object):
	# JonB
	'''simple iterator for ui.View objects, capable of depth or breadth first traversal'''
	def __init__(self,v,breadthfirst=False):
		self._dq=deque([v])
		self._breadth=breadthfirst

	def __iter__(self):
		'''required for iterator objects'''
		return self

	def __next__(self):
		'''required for iterator objects.  raise stopiteration once the queue is empty.  '''
		if not self._dq:
			raise StopIteration
		#pop next view...
		if self._breadth:
			v=self._dq.popleft()# oldest entry (FIFO)
		else:
			v=self._dq.pop() # newest entry (stack)
		#then push its subviews
		if hasattr(v,'subviews'):
			self._dq.extend(v.subviews)
		return v

	def sub_view_objects(self, breadthfirst = False):
		self._breadth=breadthfirst
		return [s for s in self]

	def sub_view_names(self, breadthfirst = False):
		self._breadth=breadthfirst
		return [s.name for s in self]

def pyui_decode(str):
	s = bz2.decompress(base64.b64decode(str))
	return s.decode('utf-8')

def WrapInstance(obj):
	class Wrapper(obj.__class__):
		def __new__(cls):
			return obj
	return Wrapper


class ThemeViewer(ui.View):
	def __init__(self, pyui_str , theme,  *args, **kwargs):
		#ui.load_view(_pyui_file_name,
		#bindings={'MyClass': WrapInstance(self), 'self': self})
		ui.load_view_str(pyui_str, bindings={'MyClass': WrapInstance(self), 'self': self})

		super().__init__(*args, **kwargs)

		self.tc = None
		self.set_tint_color_cheat(theme)
		self.theme = theme
		self.border_width=.5
		self.corner_radius = 6
		self.border_color='darkgray'
		self.update_view()

	def update_view(self):

		self['lb_theme'].border_color = 'darkgray'
		self['lb_theme'].text = self.theme

		# attempt to set all subviews border color to the correct
		# tint color.only shown on obects that have a border_width set
		for sv in ViewWalker(self).sub_view_objects():
			sv.border_color = self.tc

	def reset_theme(self, sender):
		#print('in, reset_theme')
		self.theme = sender.title
		self.set_tint_color_cheat(self.theme)
		editor.apply_ui_theme(self, theme_name = sender.title)
		self.update_view()

	def set_tint_color_cheat(self, theme):
		# maybe this is a screw up....
		#return
		btn = ui.Button()
		editor.apply_ui_theme(btn, theme_name = theme)
		self.tc = btn.tint_color

	def take_screenshot(self):
		# take a screenshot of the ui.View.bounds
		with ui.ImageContext(self.width, self.height) as ctx:
			self.draw_snapshot()
			return ctx.get_image()

if __name__ == '__main__':
	# initial theme
	theme = 'Cool Glow'

	# decode the pyui str
	pyui_str = pyui_decode(__pyui_str__)

	tv = ThemeViewer(theme = theme , pyui_str = pyui_str)

	editor.present_themed(tv, theme_name=theme, style='sheet', animated=False)

	# take a screen shot of the view, could be used to create thumbnail
	# images for example...
	img = tv.take_screenshot()

	# show the image in the console
	img.show()

	# write the snapshot to a png file
	bytes = img.to_png()
	with open(theme + '.png', 'wb') as file:
		file.write(bytes)