"""ArGaze module commands."""

"""
This program is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
this program. If not, see <https://www.gnu.org/licenses/>.
"""

__author__ = "Théo de la Hogue"
__credits__ = []
__copyright__ = "Copyright 2023, Ecole Nationale de l'Aviation Civile (ENAC)"
__license__ = "GPLv3"

import argparse
import logging
import json
import contextlib
import time
import os
import stat

from . import load
from .DataFeatures import SharedObjectBusy
from .ArFeatures import ArCamera, ArContext, PostProcessingContext, LiveProcessingContext
from .utils.UtilsFeatures import print_progress_bar

import cv2


def load_context(args):
	"""Load and execute ArContext configuration."""

	# Manage logging
	logging.basicConfig(format='%(levelname)s: %(message)s', level=logging.DEBUG if args.verbose else logging.INFO)

	# Manage pipe communication
	if args.pipe_path is not None:

		# Create FIFO
		if not os.path.exists(args.pipe_path):

			os.mkfifo(args.pipe_path)

		# Open the fifo in non-blocking mode or it will stalls until someone opens it for writting
		pipe_file = os.open(args.pipe_path, os.O_RDONLY | os.O_NONBLOCK)

		logging.info('%s pipe opened', args.pipe_path)

	def display(name, image, factor = 0.75, draw_help = False):
		"""Adapt image to display dimension."""

		height, width, _ = image.shape

		if draw_help:

			cv2.rectangle(image, (int(width/4), int(height/3)), (int(width*3/4), int(height*2/3)), (127, 127, 127), -1)
			cv2.rectangle(image, (int(width/4), int(height/3)), (int(width*3/4), int(height*2/3)), (255, 255, 255), 1)

			info_stack = 1
			cv2.putText(image, f'(H)elp', (int(width/4)+20, int(height/3)+(info_stack*40)), cv2.FONT_HERSHEY_SIMPLEX, 1, (255, 255, 255), 1, cv2.LINE_AA)

			# Blanck line
			info_stack += 1

			if issubclass(type(context), LiveProcessingContext):
		
				info_stack += 1
				cv2.putText(image, f'Press Enter to start calibration', (int(width/4)+20, int(height/3)+(info_stack*40)), cv2.FONT_HERSHEY_SIMPLEX, 1, (255, 255, 255), 1, cv2.LINE_AA)

				info_stack += 1
				cv2.putText(image, f'Press r to start/stop recording', (int(width/4)+20, int(height/3)+(info_stack*40)), cv2.FONT_HERSHEY_SIMPLEX, 1, (255, 255, 255), 1, cv2.LINE_AA)

			if issubclass(type(context), PostProcessingContext):

				info_stack += 1
				cv2.putText(image, f'Press Space bar to pause/resume processing', (int(width/4)+20, int(height/3)+(info_stack*40)), cv2.FONT_HERSHEY_SIMPLEX, 1, (255, 255, 255), 1, cv2.LINE_AA)

			info_stack += 1
			cv2.putText(image, f'Press f to pause/resume visualisation', (int(width/4)+20, int(height/3)+(info_stack*40)), cv2.FONT_HERSHEY_SIMPLEX, 1, (255, 255, 255), 1, cv2.LINE_AA)

			info_stack += 1
			cv2.putText(image, f'Press Escape to quit', (int(width/4)+20, int(height/3)+(info_stack*40)), cv2.FONT_HERSHEY_SIMPLEX, 1, (255, 255, 255), 1, cv2.LINE_AA)

		else:

			cv2.putText(image, f'(H)elp', (width-105, height - 15), cv2.FONT_HERSHEY_SIMPLEX, 1, (255, 255, 255), 1, cv2.LINE_AA)

		if args.display is not None:

			display_size = tuple(args.display)
			
			image_ratio = width/height

			new_image_size = (int(display_size[1] * factor * image_ratio), int(display_size[1] * factor))

			image = cv2.resize(image, dsize=new_image_size, interpolation=cv2.INTER_LINEAR)

		cv2.imshow(name, image)

	# Load context from JSON file
	with load(args.context_file) as context:

		if context.starting_error is not None:

			exit( RuntimeError(f'Context fails to start: {context.starting_error}') )

		# Loaded object must be a subclass of ArContext
		if not issubclass(type(context), ArContext):

			exit( TypeError('Loaded object is not a subclass of ArContext') )

		if args.verbose:

			print(context)

		if not args.no_window:

			# Create a window to display context
			cv2.namedWindow(context.name, cv2.WINDOW_AUTOSIZE)

		# Assess processing time
		start_time = time.time()

		# Draw parameters
		draw_pipeline = True
		draw_help = False

		# Waiting for 'ctrl+C' interruption
		with contextlib.suppress(KeyboardInterrupt), os.fdopen(pipe_file) if args.pipe_path is not None else contextlib.nullcontext() as pipe:

			# Visualization loop
			while context.is_running():

				# Read message from pipe if required
				if args.pipe_path is not None:

					try:

						message = pipe.read().rstrip('\n')

						if message:

							logging.info('%s pipe received: %s', args.pipe_path, message)

							exec(message)

					except Exception as e:

						logging.error('%s', e)

				# Window mode on
				if not args.no_window:

					try:

						# Display context if the pipeline is available
						display(context.name, context.image(wait = False, draw_pipeline=draw_pipeline), 0.75, draw_help=draw_help)

					except SharedObjectBusy:

						pass

					# Head-mounted eye tracker case: display environment frames image
					if issubclass(type(context.pipeline), ArCamera):

						for scene_frame in context.pipeline.scene_frames():

							try:

								# Display scene's frame if available
								display(scene_frame.name, scene_frame.image(wait = False), 0.5)

							except SharedObjectBusy:

								pass

					# Key interaction
					key_pressed = cv2.waitKey(40)
					#print("key_pressed", key_pressed)

					# f: disable/enable pipeline drawing
					if key_pressed == 102:

						draw_pipeline = not draw_pipeline

					# h: disable/enable help drawing
					if key_pressed == 104:

						draw_help = not draw_help

					# Esc: close window
					if key_pressed == 27:

						raise KeyboardInterrupt()

					# Keys specific to live processing contexts
					if issubclass(type(context), LiveProcessingContext):

						# Enter: start calibration
						if key_pressed == 13:

								context.calibrate()

						# r: start/stop recording
						if key_pressed == 114:

							# FIXME: the following commands only work with TobiiGlassesPro2.LiveStream context.
							recording_status = context.get_recording_status()

							if recording_status == 'recording':

								context.stop_recording()
								
							else:

								context.create_recording()
								context.start_recording()

					# Keys specific to post processing contexts
					if issubclass(type(context), PostProcessingContext):

						# Space bar: pause/resume pipeline processing
						if key_pressed == 32:


								if context.is_paused():

									context.resume()

								else:

									context.pause()

						# Select previous image with left arrow
						if key_pressed == 2:

							context.previous()
						
						# Select next image with right arrow
						if key_pressed == 3:

							context.next()
							
				# Window mode off
				else:

					if issubclass(type(context), PostProcessingContext):

						prefix = f'Progression'
						suffix = f'| {int(context.progression*context.duration * 1e-3)}s in {int(time.time()-start_time)}s'

						look_time, look_freq = context.pipeline.execution_info('look')
						suffix += f' | Look {look_time:.2f}ms at {look_freq}Hz'

						if issubclass(type(context.pipeline), ArCamera):

							watch_time, watch_freq = context.pipeline.execution_info('watch')
							suffix += f' | Watch {int(watch_time)}ms at {watch_freq}Hz'

						# Clear old longer print
						suffix += '   '

						print_progress_bar(context.progression, 1., prefix = prefix, suffix = suffix, length = 50)

					# Wait one second
					time.sleep(1)

		# Stop frame display
		cv2.destroyAllWindows()

		# Manage pipe communication
		if args.pipe_path is not None:

			# Remove pipe
			if os.path.exists(args.pipe_path):

				os.remove(args.pipe_path)

				logging.info('%s pipe closed', args.pipe_path)

def edit_file(args):
	"""
	Edit a JSON file according a JSON changes file into a JSON output file.
	"""

	# Open JSON files
	with open(args.file) as file, open(args.changes) as changes, open(args.output, 'w', encoding='utf-8') as output:

		import collections.abc
		import json

		# Load unique object
		file_data = json.load(file)
		changes_data = json.load(changes)

		def update(d, u):

			for k, v in u.items():

				if isinstance(v, collections.abc.Mapping):

					d[k] = update(d.get(k, {}), v)

				elif v is None:

					del d[k]

				else:

					d[k] = v

			return d

		new_data = update(file_data, changes_data)

		# Write new data
		json.dump(new_data, output, ensure_ascii=False, indent='   ')

# Manage arguments
parser = argparse.ArgumentParser(description=__doc__.split('-')[0])
subparsers = parser.add_subparsers(help='sub-command help')

parser_load = subparsers.add_parser('load', help=load_context.__doc__)
parser_load.add_argument('context_file', metavar='CONTEXT_FILE', type=str, help='JSON context filepath')
parser_load.add_argument('-v', '--verbose', action='store_true', default=False, help='enable verbose mode to print information in console')
parser_load.add_argument('-p', '--pipe_path', metavar='PIPE_PATH', type=str, default=None, help='enable pipe communication to execute external commands')
parser_load.add_argument('-x', '--display', metavar='DISPLAY', nargs="+", type=int, default=None, help='adapt windows to display dimension')
parser_load.add_argument('--no-window', action='store_true', default=False, help='disable window mode')
parser_load.set_defaults(func=load_context)

parser_patch = subparsers.add_parser('edit', help=edit_file.__doc__)
parser_patch.add_argument('file', metavar='FILE', type=str, default=None, help='json file path')
parser_patch.add_argument('changes', metavar='CHANGES', type=str, default=None, help='json changes path')
parser_patch.add_argument('output', metavar='OUTPUT', type=str, default=None, help='json output path')
parser_patch.set_defaults(func=edit_file)

args = parser.parse_args()
args.func(args)