#! /usr/bin/python3
# Copyright (C) 2018 Merspieler, merspieler _at_ airmail.cc
#
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

import os
import re
import sys
import json
from time import sleep

try:
	import tty, termios
except ImportError:
	# Probably Windows.
	try:
		import msvcrt
	except ImportError:
		# Just give up here.
		raise ImportError('getch not available')
	else:
		getch = msvcrt.getch
else:
	def getch():
		fd = sys.stdin.fileno()
		old_settings = termios.tcgetattr(fd)
		try:
			tty.setraw(fd)
			ch = sys.stdin.read(1)
		finally:
			termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)
		return ch

argc = len(sys.argv)
try:
	project = sys.argv[1]
except:
	print("No project was given. See edit-settings -h for details")
	sys.exit(1)
i = 1
while i < argc:
	if sys.argv[i] == "-h" or sys.argv[i] == "--help":
		print("useage: edit-settings <project> [OPTIONS]")
		print("You can edit your project settings\n")
		print("OPTIONS")
		print("  -h, --help      Shows this help and exit")
		sys.exit(0)
	elif i != 1:
		print("Unknown option " + sys.argv[i])
		sys.exit(1)
	i += 1

if project == "":
	print("Option -p <project> is mandatory")
	sys.exit(1)

if os.path.isfile("projects/" + project + "/params.ini") == False:
	print("Project '" + project + "' not found")
	sys.exit(1)

console_height, console_width = os.popen('stty size', 'r').read().split()

def fill_space ( string, aim_length ):
	length = len(string)
	while length < aim_length:
		string += " "
		length += 1
	return string

#try:
with open("parameters") as json_data:
	options = json.load(json_data)
#except:
#	print("A problem occured while reading the file with all available parameters")

class colors:
	SELECTED = '\033[30;42m'
	HIGHLIGHT = '\033[30;46m'
	ERR = '\033[37;41m'
	HELP_HIGHLIGHT = '\033[96m'
	NOT_SAVED = '\033[33m'
	ENDC = '\033[0m'

try:
	print("Reading ini file...")
	ini_file = open("projects/" + project + "/params.ini", "r")
	for line in ini_file:
		for group in options:
			for option in group["Options"]:
				ret = re.search(option["Name"] + " = (.*)", line)
				if ret:
					value = ret.group(1).replace("'", "")
					value = value.replace('"', "")
					if option["type"] == "bool":
						if value == "False":
							option["value"] = False
						else:
							option["value"] = True
					elif option["type"] == "str":
						option["value"] = str(value)
					elif option["type"] == "float":
						option["value"] = float(value)
					elif option["type"] == "int":
						option["value"] = int(value)
except:
	print("A problem occured while reading the params.ini file...")
	sys.exit(1)
finally:
	ini_file.close()

line_sel = 1
mode = "group-select"
selected_group = ""
err_msg = ""
saved = True

while True:
	os.system('clear')

	print(colors.ERR + err_msg + colors.ENDC)
	draw_line = 1
	while draw_line < int(console_height) - 2:
		line = " "

		try:
			if mode == "group-select":
				line += options[draw_line - 1]["Group_Name"]
				line = fill_space(line, 24)
				opt_count = len(options[draw_line - 1]["Options"])
				if opt_count < 10:
					line += " "
				line += str(opt_count)
				
			elif mode == "option-select":
				line += options[selected_group]["Options"][draw_line - 1]["Name"]
				line = fill_space(line, 46)
				value = str(options[selected_group]["Options"][draw_line - 1]["value"])
				if options[selected_group]["Options"][draw_line - 1]["changed"]:
					value = colors.NOT_SAVED + value + colors.ENDC
				elif options[selected_group]["Options"][draw_line - 1]["value"] != options[selected_group]["Options"][draw_line - 1]["default"]:
					value = colors.HELP_HIGHLIGHT + value + colors.ENDC
				line += value
		except IndexError:
			pass

		if line_sel == draw_line:
			line = colors.SELECTED + line + colors.ENDC

		print(line)
		draw_line += 1

	# Status and help line
	print("h" + colors.HIGHLIGHT + "Help  " + colors.ENDC + "j" + colors.HIGHLIGHT + "Down  " + colors.ENDC + "k" + colors.HIGHLIGHT + "Up    " + colors.ENDC + "Enter" + colors.HIGHLIGHT + "Select" + colors.ENDC + "q" + colors.HIGHLIGHT + "Quit  " + colors.ENDC + "s" + colors.HIGHLIGHT + "Save  " + colors.ENDC)

	key = ord(getch())
#	print(key)
#	sleep(1)
	if key == 27 or key == 113: # ESC or Q
		if saved:
			break
		else:
			ret = input("You have made changes but you haven't saved. Do you really want to quit? (y/n): ")
			if ret == "y":
				break
	elif key == 13: # Enter
		if mode == "group-select":
			mode = "option-select"
			selected_group = line_sel - 1
			line_sel = 1
		elif mode == "option-select":
			if options[selected_group]["Options"][line_sel - 1]["type"] == "bool":
				options[selected_group]["Options"][line_sel - 1]["value"] = not options[selected_group]["Options"][line_sel - 1]["value"]
				err_msg = ""
				saved = False
				options[selected_group]["Options"][line_sel - 1]["changed"] = True
			elif options[selected_group]["Options"][line_sel - 1]["type"] == "int":
				ret = input("Please enter a new value of type INT for '" + options[selected_group]["Options"][line_sel - 1]["Name"] + "': ")
				search = re.search("^[0-9]*$", ret)
				if search:
					options[selected_group]["Options"][line_sel - 1]["value"] = int(ret)
					err_msg = ""
					saved = False
					options[selected_group]["Options"][line_sel - 1]["changed"] = True
				else:
					err_msg = "'" + ret + "' is no valid value for type INT"
			elif options[selected_group]["Options"][line_sel - 1]["type"] == "float":
				ret = input("Please enter a new value of type FLOAT for '" + options[selected_group]["Options"][line_sel - 1]["Name"] + "': ")
				search = re.search("^[0-9]*\.[0-9]*$|^[0-9]*$", ret)
				if search:
					options[selected_group]["Options"][line_sel - 1]["value"] = float(ret)
					err_msg = ""
					saved = False
					options[selected_group]["Options"][line_sel - 1]["changed"] = True
				else:
					err_msg = "'" + ret + "' is no valid value for type FLOAT"
			elif options[selected_group]["Options"][line_sel - 1]["type"] == "str":
				options[selected_group]["Options"][line_sel - 1]["value"]  = input("Please enter a new value of type STRING for '" + options[selected_group]["Options"][line_sel - 1]["Name"] + "': ")
				err_msg = ""
				saved = False
				options[selected_group]["Options"][line_sel - 1]["changed"] = True
	elif key == 106: # J
		if mode == "group-select":
			if line_sel < len(options):
				line_sel += 1
		elif mode == "option-select":
			if line_sel < len(options[selected_group]["Options"]):
				line_sel += 1 
	elif key == 107: # K
		if line_sel > 1:
			line_sel -= 1
	elif key == 104: # H
		os.system('clear')
		print(colors.HELP_HIGHLIGHT + "This program is released as part of easy-osm2city.")
		print("See the LICENSE file for more information." + colors.ENDC)
		print("\nIn group select mode you can select a group of parameters.")
		print("The groups are similar as the groups on the official docs site.")
		print("\nIn option select mode you can edit the parameters value.")
		print("\nControls:")
		print(colors.HELP_HIGHLIGHT + "     j: " + colors.ENDC + "Scroll down")
		print(colors.HELP_HIGHLIGHT + "     k: " + colors.ENDC + "Scroll up")
		print(colors.HELP_HIGHLIGHT + "     b: " + colors.ENDC + "Go back to group view")
		print(colors.HELP_HIGHLIGHT + " Enter: " + colors.ENDC + "In group view, select group")
		print("        On bool value, toggle True/False")
		print("        On other values, bring up dialog to change value")
		print(colors.HELP_HIGHLIGHT + "     r: " + colors.ENDC + "Resets the selected parameter to the default value")
		print(colors.HELP_HIGHLIGHT + "     d: " + colors.ENDC + "Shows parameter description")
		print(colors.HELP_HIGHLIGHT + "     s: " + colors.ENDC + "Saves the changes to the params.ini file")
		print(colors.HELP_HIGHLIGHT + " ESC q: " + colors.ENDC + "Exit the program. Ask if should be exited if changes were not saved")
		print("Press any key to return.")
		getch()
	elif key == 100: # D
		if mode == "option-select":
			os.system('clear')
			if options[selected_group]["Options"][line_sel - 1]["description"] != "":
				print(options[selected_group]["Options"][line_sel - 1]["description"])
			else:
				print("No description available")
			print(colors.HELP_HIGHLIGHT + "\n\n current value: " + colors.ENDC + str(options[selected_group]["Options"][line_sel - 1]["value"]))
			print(colors.HELP_HIGHLIGHT + " default value: " + colors.ENDC + str(options[selected_group]["Options"][line_sel - 1]["default"]))
			print(colors.HELP_HIGHLIGHT + "\nPress any key to return." + colors.ENDC)
			getch()
	elif key == 98: # B
		if mode == "option-select":
			mode = "group-select"
			line_sel = selected_group + 1
			err_msg = ""
	elif key == 115: # S
		ini_file = open("projects/" + project + "/params.ini", "w")
		for group in options:
			written = False
			for option in group["Options"]:
				# Write only non default values to file.
				if option["default"] != option["value"]:
					if option["type"] == "str":
						ini_file.write(option["Name"] + ' = "' + str(option["value"]) + '"\n')
					else:
						ini_file.write(option["Name"] + " = " + str(option["value"]) + "\n")
					written = True
			if written:
				ini_file.write("\n") # make the file more readable by seperating in blocks
		ini_file.close()
		saved = True
		for i in range(0, len(options)):
			for j in range(0, len(options[i]["Options"])):
				options[i]["Options"][j]["changed"] = False
	elif key == 114: # R
		if mode == "option-select":
			options[selected_group]["Options"][line_sel - 1]["value"] = options[selected_group]["Options"][line_sel - 1]["default"]