# -*- coding: UTF-8 -*-
'''
rtx - RetroText
rtxMask: Klasse zur Verarbeitung einer Eingabemaske
by Anna Christina Naß <acn@acn.wtf>
released under GPL
'''

import glob
import logging
import config
import cept

class rtxMask:
	""" Klasse zur Verarbeitung einer Eingabemaske
	"""

	lines = []
	answers = []

	def __init__(self):

	def addLine(x, y, length):
		""" adds a new line for the mask to the object """
		newLine['x'] = x
		newLine['y'] = y
		newLine['length'] = length
		self.lines.append(newLine)

	def get_answer(self, nr):
		""" returns the answer for a specific line """
		if nr >= 0 and nr <= len(self.answers):
			return self.answers[nr]
		else
			return False

	def get_answers(self):
		""" returns the array of all answers """
		return self.answers

	def _pos_cur_to_line(self, line):
		""" positions the cursor to the beginning of a line """
		zeile=self.lines[line]
		self._pos_cur_to_xy(zeile['x'], zeile['y'])

	def _pos_cur_to_xy(self, x, y):
		""" positions the cursor to a (x,y) position on screen """
		toX=0x41 + x
		toY=0x41 + y
		gotoString = "\x1f" + chr(toX) + chr(toY)
		glob.ser.write(bytes(gotoString, "latin-1"))

	def _set_str_at_pos(self, char, pos, line):
		""" changes the 'char' at a position 'pos' of a specific answer 'line' """
		zeile = self.answers[line]

		# if the line is shorter than the position, add spaces
		while len(zeile) < pos:
			zeile += " "

		zeile = zeile[:pos-1] + char + zeile[pos:]
		answers[line] = zeile

	def _cut_off_rest_of_line(self, line, pos):
		""" erases the rest of the line from the 'lines' variable and from the screen """
		zeile = self.answers[line]
		self.answers[line] = zeile[:pos]

		if zeile[pos:] != "":
			numOfSpaces = len(zeile[pos:])
			spaces = " " * numOfSpaces
			backSpaces = "\x08" * numOfSpaces
			glob.ser.write(bytes(spaces + backSpaces, "latin-1"))

	def process_input(self):
		""" reads the input from the client, fills the mask and gets the input """

		if len(lines) == 0:
			logging.debug("Keine Zeilen in der Maske definiert!")
			return False

		# position the cursor into the first field
		self._pos_cur_to_line(lines[1])
		posx = 0  # cursor position inside the line - max. position is length-1
		posy = 0  # the current line - max. number is len(lines)-1

		weiter = True
		# read input and interpret it			
		while weiter==True:
			# if the modem hangs up, exit the function:
			#if config.MODE == "modem" and glob.ser.getCD() == False:
			#	weiter=False
			in_byte = glob.ser.read(1)
			instr = str(in_byte, encoding="latin-1")
			echostr = instr

			if instr == cept.TER or instr == cept.CR:
				if posy == len(lines)-1:
					# this was the last line, now send the data
					# TODO
					weiter = False
			elif instr.isalnum():
				self._set_str_at_pos(instr, posx, posy)
				posx += 1
			elif instr == cept.BSP:
				answers[posy] = answers[posy][:-1]
				posx -= 1
			else:
				echostr = ""

			# lineinput == Zeilenende beachten

			glob.ser.write(bytes(echostr, "latin-1"))