#!/usr/bin/env python3

import io
import logging
import qrcode

from typing import Dict, Callable

from slixmpp import JID, InvalidJID

from poezio import windows
from poezio.tabs import Tab
from poezio.core.structs import Command
from poezio.decorators import command_args_parser
from poezio.plugin import BasePlugin
from poezio.theming import get_theme, to_curses_attr
from poezio.windows.base_wins import Win

log = logging.getLogger(__name__)

class QrWindow(Win):
    __slots__ = ('qr', 'invert', 'inverted')

    str_invert = " Invert "
    str_close = " Close "

    def __init__(self, qr: str) -> None:
        self.qr = qr
        self.invert = True
        self.inverted = True

    def refresh(self) -> None:
        self._win.erase()
        # draw QR code
        code = qrcode.QRCode()
        code.add_data(self.qr)
        out = io.StringIO()
        code.print_ascii(out, invert=self.inverted)
        self.addstr("   " + self.qr + "\n")
        self.addstr(out.getvalue(), to_curses_attr((15, 0)))
        self.addstr("   ")

        col = to_curses_attr(get_theme().COLOR_TAB_NORMAL)

        if self.invert:
            self.addstr(self.str_invert, col)
        else:
            self.addstr(self.str_invert)

        self.addstr("   ")

        if self.invert:
            self.addstr(self.str_close)
        else:
            self.addstr(self.str_close, col)

        self._refresh()

    def toggle_choice(self) -> None:
        self.invert = not self.invert

    def engage(self) -> bool:
        if self.invert:
            self.inverted = not self.inverted
            return False
        else:
            return True

class QrTab(Tab):
    plugin_commands = {}  # type: Dict[str, Command]
    plugin_keys = {}  # type: Dict[str, Callable]

    def __init__(self, core, qr):
        Tab.__init__(self, core)
        self.state = 'highlight'
        self.text = qr
        self._name = qr
        self.topic_win = windows.Topic()
        self.topic_win.set_message(qr)
        self.qr_win = QrWindow(qr)
        self.help_win = windows.HelpText(
            "Choose with arrow keys and press enter")
        self.key_func['^I'] = self.toggle_choice
        self.key_func[' '] = self.toggle_choice
        self.key_func['KEY_LEFT'] = self.toggle_choice
        self.key_func['KEY_RIGHT'] = self.toggle_choice
        self.key_func['^M'] = self.engage
        self.resize()
        self.update_commands()
        self.update_keys()

    def resize(self):
        self.need_resize = False
        self.topic_win.resize(1, self.width, 0, 0)
        self.qr_win.resize(self.height-3, self.width, 1, 0)
        self.help_win.resize(1, self.width, self.height-1, 0)

    def refresh(self):
        if self.need_resize:
            self.resize()
        log.debug('  TAB   Refresh: %s', self.__class__.__name__)
        self.refresh_tab_win()
        self.info_win.refresh()
        self.topic_win.refresh()
        self.qr_win.refresh()
        self.help_win.refresh()

    def on_input(self, key, raw):
        if not raw and key in self.key_func:
            return self.key_func[key]()

    def toggle_choice(self):
        log.debug('  TAB   toggle_choice: %s', self.__class__.__name__)
        self.qr_win.toggle_choice()
        self.refresh()
        self.core.doupdate()

    def engage(self):
        log.debug('  TAB   engage: %s', self.__class__.__name__)
        if self.qr_win.engage():
            self.core.close_tab(self)
        else:
            self.refresh()
            self.core.doupdate()

class Plugin(BasePlugin):
    def init(self):
        self.api.add_command(
            'qr',
            self.command_qr,
            usage='<message>',
            short='Display a QR code',
            help='Display a QR code of <message> in a new tab')
        self.api.add_command(
            'invitation',
            self.command_invite,
            usage='[<server>]',
            short='Invite a user',
            help='Generate a XEP-0401 invitation on your server or on <server> and display a QR code')

    def command_qr(self, msg):
        t = QrTab(self.core, msg)
        self.core.add_tab(t, True)
        self.core.doupdate()

    def on_next(self, iq, adhoc_session):
        status = iq['command']['status']
        xform = iq.xml.find(
            '{http://jabber.org/protocol/commands}command/{jabber:x:data}x')
        if xform is not None:
            form = self.core.xmpp.plugin['xep_0004'].build_form(xform)
        else:
            form = None
        uri = None
        if status == 'completed' and form:
            for field in form:
                log.debug('  field: %s -> %s', field['var'], field['value'])
                if field['var'] == 'landing-url' and field['value']:
                    uri = field.get_value(convert=False)
                if field['var'] == 'uri' and field['value'] and uri is None:
                    uri = field.get_value(convert=False)
        if uri:
            t = QrTab(self.core, uri)
            self.core.add_tab(t, True)
            self.core.doupdate()
        else:
            self.core.handler.next_adhoc_step(iq, adhoc_session)
        

    @command_args_parser.quoted(0, 1, defaults=[])
    def command_invite(self, args):
        server = self.core.xmpp.boundjid.domain
        if len(args) > 0:
            try:
                server = JID(args[0])
            except InvalidJID:
                self.api.information(f'Invalid JID: {args[0]}', 'Error')
                return
        session = {
            'next' : self.on_next,
            'error': self.core.handler.adhoc_error
        }
        self.core.xmpp.plugin['xep_0050'].start_command(server, 'urn:xmpp:invite#invite', session)