# -*- 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):
        return

    def addLine(self, x, y, length):
        """ adds a new line for the mask to the object """
        newLine = {}
        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 """
        self._pos_cur_to_xy(line['x'], line['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:]
        self.answers[line] = zeile

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

        # if there have no input lines been defined, no input can be processed - so exit the function
        if len(self.lines) == 0:
            logging.debug("Keine Zeilen in der Maske definiert!")
            return False

        # position the cursor into the first field
        self._pos_cur_to_line(self.lines[0])

        posx = 0  # cursor position inside the line - max. position is length-1
        posy = 0  # the current line - max. number is len(self.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:
                # go to the beginning of the next line
                # or finish the mask
                if posy == len(self.lines)-1:
                    weiter = False
                    self._send_data()
                else:
                    # go to the beginning of the next line
                    posy += 1
                    posx = 0
                    self._pos_cur_to_line(self.lines[posy])
            elif instr == cept.BSP:
                self.answers[posy] = self.answers[posy][:-1]
                posx -= 1
            elif instr == cept.UP:
                # if the cursor is in the first line, we can't go higher...
                # so we ignore the keypress
                echostr = "" # no echo needed, we position the curser ourselves
                if posy > 0:
                    posy -= 1
                    posx = 0
                    self._pos_cur_to_line(self.lines[posy])
            elif instr == cept.DOWN:
                # same here: last line => it can't go lower => ignore
                echostr = "" # no echo needed, we position the curser ourselves
                if posy < len(self.lines):
                    posy += 1
                    posx = 0
                    self._pos_cur_to_line(self.lines[posy])
            elif instr == cept.LEFT:
                if posx > 0:
                    posx -= 1
                else:
                    echostr = ""
            elif instr == cept.RIGHT:
                if posx < len(self.answers[posy]):
                    posx += 1
                else:
                    echostr = ""
            elif instr == cept.HOME:
                posy = 0
                posx = 0
                self._pos_cur_to_line(self.lines[posy])
                echostr = ""
            elif instr == cept.SEND:  # ist das DCT??
                weiter = False
                self._send_data()
            elif instr.isalnum():
                # "normal" input
                # TODO: lineinput == Zeilenende beachten
                #self._set_str_at_pos(instr, posx, posy)
                posx += 1
            else:
                # ignore the rest and do not echo it :)
                echostr = ""

            # now send the echo
            glob.ser.write(bytes(echostr, "latin-1"))

    def _send_data(self):
        """ strip spaces from the right of the answers and save them """
        new_answers = []
        for answer in self.answers:
            temp = answer.rstrip()
            new_answers.append(temp)
        self.answers = new_answers
        print(self.answers)