import threading

from PyQt4.Qt import (QDialog, QInputDialog, QLineEdit,
                      QVBoxLayout, QLabel, SIGNAL)
import PyQt4.QtCore as QtCore

from electrum.i18n import _
from electrum.plugins import hook
from .ledger import LedgerPlugin, BTChipWallet

class Plugin(LedgerPlugin):

    @hook
    def load_wallet(self, wallet, window):
        if type(wallet) != BTChipWallet:
            return
        wallet.handler = BTChipQTHandler(window)
        if self.btchip_is_connected(wallet):
            if not wallet.check_proper_device():
                window.show_error(_("This wallet does not match your Ledger device"))
                wallet.force_watching_only = True
        else:
            window.show_error(_("Ledger device not detected.\nContinuing in watching-only mode."))
            wallet.force_watching_only = True

    def on_create_wallet(self, wallet, wizard):
        assert type(wallet) == self.wallet_class
        wallet.handler = BTChipQTHandler(wizard)
#        self.select_device(wallet)
        wallet.create_hd_account(None)

class BTChipQTHandler:

    def __init__(self, win):
        self.win = win
        self.win.connect(win, SIGNAL('btchip_done'), self.dialog_stop)
        self.win.connect(win, SIGNAL('btchip_message_dialog'), self.message_dialog)
        self.win.connect(win, SIGNAL('btchip_auth_dialog'), self.auth_dialog)
        self.done = threading.Event()

    def stop(self):
        self.win.emit(SIGNAL('btchip_done'))

    def show_message(self, msg):
        self.message = msg
        self.win.emit(SIGNAL('btchip_message_dialog'))

    def prompt_auth(self, msg):
        self.done.clear()
        self.message = msg
        self.win.emit(SIGNAL('btchip_auth_dialog'))
        self.done.wait()
        return self.response

    def auth_dialog(self):
        response = QInputDialog.getText(None, "Ledger Wallet Authentication", self.message, QLineEdit.Password)
        if not response[1]:
            self.response = None
        else:
            self.response = str(response[0])
        self.done.set()

    def message_dialog(self):
        self.d = QDialog()
        self.d.setModal(1)
        self.d.setWindowTitle('Ledger')
        self.d.setWindowFlags(self.d.windowFlags() | QtCore.Qt.WindowStaysOnTopHint)
        l = QLabel(self.message)
        vbox = QVBoxLayout(self.d)
        vbox.addWidget(l)
        self.d.show()

    def dialog_stop(self):
        if self.d is not None:
            self.d.hide()
            self.d = None