#!/bin/python
# -*- coding: utf-8 -*-

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

import os, struct, sys, pty, tty, termios, shlex, signal, select, pyte, time
from fenrirscreenreader.core import debug
from fenrirscreenreader.core.eventData import fenrirEventType
from fenrirscreenreader.core.screenDriver import screenDriver

class Terminal:
    def __init__(self, columns, lines, p_in):
        self.screen = pyte.HistoryScreen(columns, lines)
        self.screen.set_mode(pyte.modes.LNM)
        self.screen.write_process_input = \
            lambda data: p_in.write(data.encode())
        self.stream = pyte.ByteStream()
        self.stream.attach(self.screen)
    def feed(self, data):
        self.stream.feed(data)
    def dump(self):
        cursor = self.screen.cursor
        lines = []
        for y in self.screen.dirty:
            line = self.screen.buffer[y]
            data = [(char.data, char.reverse, char.fg, char.bg)
                    for char in (line[x] for x in range(self.screen.columns))]
            lines.append((data))
        self.screen.dirty.clear()
        return {"cursor": (cursor.x, cursor.y), "lines": lines}     

class driver(screenDriver):
    def __init__(self):
        screenDriver.__init__(self)
        self.ListSessions = None
        self.charmap = {}
        self.bgColorNames = {0: _('black'), 1: _('blue'), 2: _('green'), 3: _('cyan'), 4: _('red'), 5: _('Magenta'), 6: _('brown/yellow'), 7: _('white')}
        self.fgColorNames = {0: _('Black'), 1: _('Blue'), 2: _('Green'), 3: _('Cyan'), 4: _('Red'), 5: _('Magenta'), 6: _('brown/yellow'), 7: _('Light gray'), 8: _('Dark gray'), 9: _('Light blue'), 10: ('Light green'), 11: _('Light cyan'), 12: _('Light red'), 13: _('Light magenta'), 14: _('Light yellow'), 15: _('White')}
        self.hichar = None        
    def initialize(self, environment):
        self.env = environment
        self.env['runtime']['processManager'].addCustomEventThread(self.terminalEmulation)        
    def getCurrScreen(self):
        self.env['screen']['oldTTY'] = str(1)
        self.env['screen']['newTTY'] = str(1)
 
    def injectTextToScreen(self, text, screen = None):
        pass
                
    def getSessionInformation(self):
        self.env['screen']['autoIgnoreScreens'] = []
        self.env['general']['prevUser'] = 'chrys'
        self.env['general']['currUser'] = 'chrys'
    def read_all(self,fd):
        bytes = os.read(fd, 65536)
        if bytes == b'':
            raise EOFError
        while self.has_more(fd):
            data = os.read(fd, 65536)
            if data == b'':
                raise EOFError
            bytes += data
        return bytes
    def has_more(self,fd):
        r, w, e = select.select([fd], [], [], 0.02)
        return (fd in r)        
    def open_terminal(self,command="bash", columns=80, lines=24):
        p_pid, master_fd = pty.fork()
        if p_pid == 0:  # Child.
            argv = shlex.split(command)
            env = os.environ.copy()
            env["TERM"] = 'vt100'
            os.execvpe(argv[0], argv, env)
        # File-like object for I/O with the child process aka command.
        p_out = os.fdopen(master_fd, "w+b", 0)
        return Terminal(columns, lines, p_out), p_pid, p_out
    def terminalEmulation(self,active , eventQueue):
        debug = False
        running = True 
        try:
            old_attr = termios.tcgetattr(sys.stdin)    
            tty.setraw(0)
            terminal, p_pid, p_out = self.open_terminal()
            std_out = os.fdopen(sys.stdout.fileno(), "w+b", 0)
            while active:
                r, w, x = select.select([sys.stdin, p_out],[],[],1)
                # none
                if r == []:
                    continue
                # output
                if p_out in r:
                    if debug:
                        print('pre p_out')                                            
                    try:
                        msgBytes = self.read_all(p_out.fileno())
                    except (EOFError, OSError):
                        running = False
                        break    
                    if debug:
                        print('after p_out read',msgBytes)                                 
                    terminal.feed(msgBytes)                                
                    os.write(sys.stdout.fileno(), msgBytes)
                    if debug:
                        print('after p_out write')                             
                    eventQueue.put({"Type":fenrirEventType.ScreenUpdate,
                        "Data":self.createScreenEventData(terminal.dump())
                    })
                    if debug:
                        print('after p_out')                    
                # input
                if sys.stdin in r:
                    if debug:
                        print('pre stdin')       
                    try:
                        msgBytes = self.read_all(sys.stdin.fileno())
                    except (EOFError, OSError):
                        running = False                    
                        break
                    os.write(p_out.fileno(), msgBytes)
                    if debug:
                        print('after stdin')                
        except Exception as e:  # Process died?
            print(e)
            running = False
        finally:
            os.kill(p_pid, signal.SIGTERM)
            p_out.close()    
            termios.tcsetattr(sys.stdin, termios.TCSADRAIN, old_attr)
            eventQueue.put({"Type":fenrirEventType.StopMainLoop,"Data":None}) 
            sys.exit(0)

    def createScreenEventData(self, content):
        eventData = {
            'bytes': content,
            'lines': int( 24),
            'columns': int( 80),
            'textCursor': 
                {
                    'x': int( content['cursor'][0]),
                    'y': int( content['cursor'][1])
                },
            'screen': '1',
            'text': '',
            'attributes': None,
            'screenUpdateTime': time.time(),            
        }
        #print(content['lines'][0])
        #print('pre',eventData['text'])        
        for line in content['lines']:
            #print('line',line)
            for e in line:
                #print('loop|',e,'|')
                eventData['text'] += e[0]
        print(len(eventData['text']), type(eventData['text']))
        #print('post',eventData['text'])
        #eventData['text'] = ''
        return eventData.copy()     

    def getFenrirBGColor(self, attribute):
        try:
            return self.bgColorNames[attribute[2]]
        except Exception as e:
            print(e)
            return ''
    def getFenrirFGColor(self, attribute):
        try:
            return self.fgColorNames[attribute[1]]
        except Exception as e:
            print(e)        
            return ''
    def getFenrirUnderline(self, attribute):
        if attribute[5] == 1:
            return _('underlined')
        return ''    
    def getFenrirBold(self, attribute):
        if attribute[4] == 1:
            return _('bold')    
        return ''    
    def getFenrirBlink(self, attribute):
        if attribute[3] == 1:
            return _('blink')    
        return ''    
    def getFenrirFont(self, attribute):
        return _('Default')
    def getFenrirFontSize(self, attribute):
        return _('Default')              
    def getCurrApplication(self):
        pass