#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# Fenrir TTY screen reader
# By Chrys, Storm Dragon, and contributers.

from fenrirscreenreader.core import debug

class command():
    def __init__(self):
        pass
    def initialize(self, environment):
        self.env = environment
    def shutdown(self):
        pass
    def getDescription(self):
        return ''
    def run(self):
        if self.env['screen']['newAttribDelta'] != '':
            return  
        if self.env['runtime']['screenManager'].isScreenChange():
            return
        if self.env['runtime']['cursorManager'].isCursorVerticalMove():
            return
        if self.env['runtime']['attributeManager'].isAttributeChange():
            return
        # hack for pdmenu and maybe other dialog apps that place the cursor at last cell/row
        # this is not to be identified as history
        if (self.env['screen']['newCursor']['x'] == self.env['runtime']['screenManager'].getColumns() - 1) and (self.env['screen']['newCursor']['y'] == self.env['runtime']['screenManager'].getRows() - 1):
            return
        if self.env['runtime']['inputManager'].getShortcutType() in ['KEY']:
            if not (self.env['runtime']['inputManager'].getLastDeepestInput() in [['KEY_UP'],['KEY_DOWN']]):
                return 
        elif self.env['runtime']['inputManager'].getShortcutType() in ['BYTE']:
            if not (self.env['runtime']['byteManager'].getLastByteKey() in [b'^[[A',b'^[[B']):
                return 

        # Get the current cursor's line from both old and new content
        prevLine = self.env['screen']['oldContentText'].split('\n')[self.env['screen']['newCursor']['y']]
        currLine = self.env['screen']['newContentText'].split('\n')[self.env['screen']['newCursor']['y']]
        
        is_blank = currLine.strip() == ''
        
        if prevLine == currLine:
            if self.env['screen']['newDelta'] != '':
                return
                
        announce = currLine
        if not is_blank:
            currPrompt = currLine.find('$')
            rootPrompt = currLine.find('#')
            if currPrompt <= 0:
                if rootPrompt > 0:
                    currPrompt = rootPrompt
                else:
                    announce = currLine
            if currPrompt > 0:
                remove_digits = str.maketrans('0123456789', '          ')
                if prevLine[:currPrompt].translate(remove_digits) == currLine[:currPrompt].translate(remove_digits):
                    announce = currLine[currPrompt+1:]
                else:
                    announce = currLine

        if is_blank:
            self.env['runtime']['outputManager'].presentText(_("blank"), soundIcon='EmptyLine', interrupt=True, flush=False)
        else:
            self.env['runtime']['outputManager'].presentText(announce, interrupt=True, flush=False)
        
        self.env['commandsIgnore']['onScreenUpdate']['CHAR_DELETE_ECHO'] = True
        self.env['commandsIgnore']['onScreenUpdate']['CHAR_ECHO'] = True
        self.env['commandsIgnore']['onScreenUpdate']['INCOMING_IGNORE'] = True
    def setCallback(self, callback):
        pass