#!/usr/bin/env python

import os, sys, argparse, os.path, json, time, signal, atexit
import pixelterm
from PIL import Image, GifImagePlugin, ImageSequence

clear_screen = '\033[H\033[2J'
home_cursor = '\033[H'
cursor_invisible = '\033[?25l'
cursor_visible = '\033[?25h'

def main():
	parser = argparse.ArgumentParser(description='Render pixel images on 256-color ANSI terminals')
	parser.add_argument('image', type=str)
	parser.add_argument('-s', '--size', type=str, help='Terminal size, [W]x[H]')
	parser.add_argument('--serve', type=int, help='Serve via TCP on given port')
	args = parser.parse_args()

	tw, th = None, None
	if args.size:
		tw, th = map(int, args.size.split('x'))
	else:
		try:
			tw, th = os.get_terminal_size()
		except: # If this is not a regular terminal
			pass
	th = th*2

	img = Image.open(args.image)
	palette = img.getpalette()
	last_frame = Image.new("RGBA", img.size)
	frames = []

	for frame in ImageSequence.Iterator(img):
		#This works around a known bug in Pillow
		#See also: http://stackoverflow.com/questions/4904940/python-converting-gif-frames-to-png
		frame.putpalette(palette)
		c = frame.convert("RGBA")

		if img.info['background'] != img.info['transparency']:
			last_frame.paste(c, c)
		else:
			last_frame = c

		im = last_frame.copy()
		if (tw, th) != (None, None):
			im.thumbnail((tw, th), Image.NEAREST)
		frames.append(pixelterm.termify_pixels(im, True))

	if args.serve:
		from socketserver import ThreadingMixIn, TCPServer, BaseRequestHandler

		# Quote-Of-The-Day protocol implementation
		# See RFC865 ( https://tools.ietf.org/html/rfc865 ) for details.

		class ThreadingTCPServer(ThreadingMixIn, TCPServer): pass

		class QOTDHandler(BaseRequestHandler):
			def handle(self):
				try:
					self.request.sendall(bytes(cursor_invisible, "UTF-8"))
					while True:
						for frame in frames:
							self.request.sendall(bytes(home_cursor + pixelterm.reset_sequence, "UTF-8"))
							self.request.sendall(bytes(frame, "UTF-8"))
							time.sleep(min(1/10, img.info['duration']/1000.0))
				except:
					pass

		server = ThreadingTCPServer(('', args.serve), QOTDHandler)
		server.serve_forever()
	else:
		print(cursor_invisible)
		atexit.register(lambda:print(cursor_visible))
		signal.signal(signal.SIGTERM, lambda signum, stack_frame: exit(1))

		try:
			while True:
				for frame in frames:
					print(home_cursor)
					print(pixelterm.reset_sequence)
					print(frame)
					time.sleep(min(1/10, img.info['duration']/1000.0))
		except KeyboardInterrupt:
			pass

if __name__ == '__main__':
	main()