import sys
import os

from PyQt4.QtGui import *
from PyQt4.QtCore import *
import PyQt4.QtCore as QtCore

import electrum
from electrum.wallet import Wallet
from electrum.mnemonic import prepare_seed
from electrum.util import UserCancelled
from electrum.base_wizard import BaseWizard
from electrum.i18n import _

from seed_dialog import SeedDisplayLayout, SeedWarningLayout, SeedInputLayout
from network_dialog import NetworkChoiceLayout
from util import *
from password_dialog import PasswordLayout, PW_NEW, PW_PASSPHRASE


class GoBack(Exception):
    pass

MSG_GENERATING_WAIT = _("Electrum is generating your addresses, please wait...")
MSG_ENTER_ANYTHING = _("Please enter a seed phrase, a master key, a list of "
                       "Bitcoin addresses, or a list of private keys")
MSG_ENTER_SEED_OR_MPK = _("Please enter a seed phrase or a master key (xpub or xprv):")
MSG_COSIGNER = _("Please enter the master public key of cosigner #%d:")
MSG_ENTER_PASSWORD = _("Choose a password to encrypt your wallet keys.") + '\n'\
                     + _("Leave this field empty if you want to disable encryption.")
MSG_RESTORE_PASSPHRASE = \
    _("Please enter the passphrase you used when creating your %s wallet.  "
      "Note this is NOT a password.  Enter nothing if you did not use "
      "one or are unsure.")

def clean_text(seed_e):
    text = unicode(seed_e.toPlainText()).strip()
    text = ' '.join(text.split())
    return text

class CosignWidget(QWidget):
    size = 120

    def __init__(self, m, n):
        QWidget.__init__(self)
        self.R = QRect(0, 0, self.size, self.size)
        self.setGeometry(self.R)
        self.setMinimumHeight(self.size)
        self.setMaximumHeight(self.size)
        self.m = m
        self.n = n

    def set_n(self, n):
        self.n = n
        self.update()

    def set_m(self, m):
        self.m = m
        self.update()

    def paintEvent(self, event):
        import math
        bgcolor = self.palette().color(QPalette.Background)
        pen = QPen(bgcolor, 7, QtCore.Qt.SolidLine)
        qp = QPainter()
        qp.begin(self)
        qp.setPen(pen)
        qp.setRenderHint(QPainter.Antialiasing)
        qp.setBrush(Qt.gray)
        for i in range(self.n):
            alpha = int(16* 360 * i/self.n)
            alpha2 = int(16* 360 * 1/self.n)
            qp.setBrush(Qt.green if i<self.m else Qt.gray)
            qp.drawPie(self.R, alpha, alpha2)
        qp.end()



def wizard_dialog(func):
    def func_wrapper(*args, **kwargs):
        run_next = kwargs['run_next']
        wizard = args[0]
        wizard.back_button.setText(_('Back') if wizard.can_go_back() else _('Cancel'))
        try:
            out = func(*args, **kwargs)
        except GoBack:
            wizard.go_back()
            return
        except UserCancelled:
            return
        #if out is None:
        #    out = ()
        if type(out) is not tuple:
            out = (out,)
        apply(run_next, out)
    return func_wrapper



# WindowModalDialog must come first as it overrides show_error
class InstallWizard(QDialog, MessageBoxMixin, BaseWizard):

    def __init__(self, config, app, plugins, network, storage):

        BaseWizard.__init__(self, config, network, storage)
        QDialog.__init__(self, None)

        self.setWindowTitle('Electrum  -  ' + _('Install Wizard'))
        self.app = app
        self.config = config

        # Set for base base class
        self.plugins = plugins
        self.language_for_seed = config.get('language')
        self.setMinimumSize(530, 370)
        self.setMaximumSize(530, 370)
        self.connect(self, QtCore.SIGNAL('accept'), self.accept)
        self.title = QLabel()
        self.main_widget = QWidget()
        self.back_button = QPushButton(_("Back"), self)
        self.next_button = QPushButton(_("Next"), self)
        self.next_button.setDefault(True)
        self.logo = QLabel()
        self.please_wait = QLabel(_("Please wait..."))
        self.please_wait.setAlignment(Qt.AlignCenter)
        self.icon_filename = None
        self.loop = QEventLoop()
        self.rejected.connect(lambda: self.loop.exit(0))
        self.back_button.clicked.connect(lambda: self.loop.exit(1))
        self.next_button.clicked.connect(lambda: self.loop.exit(2))
        outer_vbox = QVBoxLayout(self)
        inner_vbox = QVBoxLayout()
        inner_vbox = QVBoxLayout()
        inner_vbox.addWidget(self.title)
        inner_vbox.addWidget(self.main_widget)
        inner_vbox.addStretch(1)
        inner_vbox.addWidget(self.please_wait)
        inner_vbox.addStretch(1)
        icon_vbox = QVBoxLayout()
        icon_vbox.addWidget(self.logo)
        icon_vbox.addStretch(1)
        hbox = QHBoxLayout()
        hbox.addLayout(icon_vbox)
        hbox.addSpacing(5)
        hbox.addLayout(inner_vbox)
        hbox.setStretchFactor(inner_vbox, 1)
        outer_vbox.addLayout(hbox)
        outer_vbox.addLayout(Buttons(self.back_button, self.next_button))
        self.set_icon(':icons/electrum.png')
        self.show()
        self.raise_()
        self.refresh_gui()  # Need for QT on MacOSX.  Lame.

    def run_and_get_wallet(self):
        # Show network dialog if config does not exist
        if self.network:
            if self.config.get('auto_connect') is None:
                self.choose_server(self.network)

        path = self.storage.path
        if self.storage.requires_split():
            self.hide()
            msg = _("The wallet '%s' contains multiple accounts, which are no longer supported in Electrum 2.7.\n\n"
                    "Do you want to split your wallet into multiple files?"%path)
            if not self.question(msg):
                return
            file_list = '\n'.join(self.storage.split_accounts())
            msg = _('Your accounts have been moved to:\n %s.\n\nDo you want to delete the old file:\n%s' % (file_list, path))
            if self.question(msg):
                os.remove(path)
                self.show_warning(_('The file was removed'))
            return

        if self.storage.requires_upgrade():
            self.hide()
            msg = _("The format of your wallet '%s' must be upgraded for Electrum. This change will not be backward compatible"%path)
            if not self.question(msg):
                return
            self.storage.upgrade()
            self.show_warning(_('Your wallet was upgraded successfully'))
            self.wallet = Wallet(self.storage)
            self.terminate()
            return self.wallet

        action = self.storage.get_action()
        if action and action != 'new':
            self.hide()
            msg = _("The file '%s' contains an incompletely created wallet.\n"
                    "Do you want to complete its creation now?") % path
            if not self.question(msg):
                if self.question(_("Do you want to delete '%s'?") % path):
                    os.remove(path)
                    self.show_warning(_('The file was removed'))
                return
            self.show()
        if action:
            # self.wallet is set in run
            self.run(action)
            return self.wallet


    def finished(self):
        '''Ensure the dialog is closed.'''
        self.accept()
        self.refresh_gui()

    def on_error(self, exc_info):
        if not isinstance(exc_info[1], UserCancelled):
            traceback.print_exception(*exc_info)
            self.show_error(str(exc_info[1]))

    def set_icon(self, filename):
        prior_filename, self.icon_filename = self.icon_filename, filename
        self.logo.setPixmap(QPixmap(filename).scaledToWidth(60))
        return prior_filename

    def set_main_layout(self, layout, title=None, raise_on_cancel=True,
                        next_enabled=True):
        self.title.setText("<b>%s</b>"%title if title else "")
        self.title.setVisible(bool(title))
        # Get rid of any prior layout by assigning it to a temporary widget
        prior_layout = self.main_widget.layout()
        if prior_layout:
            QWidget().setLayout(prior_layout)
        self.main_widget.setLayout(layout)
        self.back_button.setEnabled(True)
        self.next_button.setEnabled(next_enabled)
        self.main_widget.setVisible(True)
        self.please_wait.setVisible(False)
        result = self.loop.exec_()
        if not result and raise_on_cancel:
            raise UserCancelled
        if result == 1:
            raise GoBack
        self.title.setVisible(False)
        self.back_button.setEnabled(False)
        self.next_button.setEnabled(False)
        self.main_widget.setVisible(False)
        self.please_wait.setVisible(True)
        self.refresh_gui()
        return result

    def refresh_gui(self):
        # For some reason, to refresh the GUI this needs to be called twice
        self.app.processEvents()
        self.app.processEvents()

    def remove_from_recently_open(self, filename):
        self.config.remove_from_recently_open(filename)

    def text_input(self, title, message, is_valid):
        slayout = SeedInputLayout(title=message)
        def sanitized_seed():
            return clean_text(slayout.seed_edit())
        def set_enabled():
            self.next_button.setEnabled(is_valid(sanitized_seed()))
        slayout.seed_edit().textChanged.connect(set_enabled)
        self.set_main_layout(slayout.layout(), title, next_enabled=False)
        seed = sanitized_seed()
        return seed

    @wizard_dialog
    def restore_keys_dialog(self, title, message, is_valid, run_next):
        return self.text_input(title, message, is_valid)

    @wizard_dialog
    def add_cosigner_dialog(self, run_next, index, is_valid):
        title = _("Add Cosigner") + " %d"%index
        message = ' '.join([
            _('Please enter the master public key of your cosigner.'),
            _('Enter their seed or master private key if you want to be able to sign for them.')
        ])
        return self.text_input(title, message, is_valid)

    @wizard_dialog
    def restore_seed_dialog(self, run_next, is_valid):
        title = _('Enter Seed')
        message = _('Please enter your seed phrase in order to restore your wallet.')
        return self.text_input(title, message, is_valid)

    @wizard_dialog
    def confirm_seed_dialog(self, run_next, is_valid):
        self.app.clipboard().clear()
        title = _('Confirm Seed')
        message = ' '.join([
            _('Your seed is important!'),
            _('To make sure that you have properly saved your seed, please retype it here.')
        ])
        return self.text_input(title, message, is_valid)

    @wizard_dialog
    def show_seed_dialog(self, run_next, seed_text):
        slayout = SeedWarningLayout(seed_text)
        self.set_main_layout(slayout.layout())
        return seed_text

    def pw_layout(self, msg, kind):
        playout = PasswordLayout(None, msg, kind, self.next_button)
        self.set_main_layout(playout.layout())
        return playout.new_password()

    @wizard_dialog
    def request_passphrase(self, device_text, run_next):
        """When restoring a wallet, request the passphrase that was used for
        the wallet on the given device and confirm it.  Should return
        a unicode string."""
        phrase = self.pw_layout(MSG_RESTORE_PASSPHRASE % device_text,
                                PW_PASSPHRASE)
        if phrase is None:
            raise UserCancelled
        return phrase

    @wizard_dialog
    def request_password(self, run_next):
        """Request the user enter a new password and confirm it.  Return
        the password or None for no password."""
        return self.pw_layout(MSG_ENTER_PASSWORD, PW_NEW)

    def show_restore(self, wallet, network):
        # FIXME: these messages are shown after the install wizard is
        # finished and the window closed.  On MacOSX they appear parented
        # with a re-appeared ghost install wizard window...
        if network:
            def task():
                wallet.wait_until_synchronized()
                if wallet.is_found():
                    msg = _("Recovery successful")
                else:
                    msg = _("No transactions found for this seed")
                self.emit(QtCore.SIGNAL('synchronized'), msg)
            self.connect(self, QtCore.SIGNAL('synchronized'), self.show_message)
            t = threading.Thread(target = task)
            t.daemon = True
            t.start()
        else:
            msg = _("This wallet was restored offline. It may "
                    "contain more addresses than displayed.")
            self.show_message(msg)

    @wizard_dialog
    def confirm_dialog(self, msg, run_next):
        self.confirm(msg)

    def confirm(self, msg):
        vbox = QVBoxLayout()
        vbox.addWidget(WWLabel(msg))
        self.set_main_layout(vbox)

    @wizard_dialog
    def action_dialog(self, action, run_next):
        self.run(action)

    def terminate(self):
        self.wallet.start_threads(self.network)
        self.emit(QtCore.SIGNAL('accept'))

    def waiting_dialog(self, task, msg):
        self.please_wait.setText(MSG_GENERATING_WAIT)
        self.refresh_gui()
        t = threading.Thread(target = task)
        t.start()

    @wizard_dialog
    def choice_dialog(self, title, message, choices, run_next):
        c_values = map(lambda x: x[0], choices)
        c_titles = map(lambda x: x[1], choices)
        clayout = ChoicesLayout(message, c_titles)
        vbox = QVBoxLayout()
        vbox.addLayout(clayout.layout())
        self.set_main_layout(vbox, title)
        action = c_values[clayout.selected_index()]
        return action

    @wizard_dialog
    def input_dialog(self, title, message, run_next):
        line = QLineEdit()
        vbox = QVBoxLayout()
        vbox.addWidget(QLabel(message))
        vbox.addWidget(line)
        self.set_main_layout(vbox, title)
        action = line.text()
        return action

    @wizard_dialog
    def show_xpub_dialog(self, xpub, run_next):
        msg = ' '.join([
            _("Here is your master public key."),
            _("Please share it with your cosigners.")
        ])
        vbox = QVBoxLayout()
        layout = SeedDisplayLayout(xpub, title=msg, sid='hot')
        vbox.addLayout(layout.layout())
        self.set_main_layout(vbox, _('Master Public Key'))
        return None

    def choose_server(self, network):
        title = _("Electrum communicates with remote servers to get "
                  "information about your transactions and addresses. The "
                  "servers all fulfil the same purpose only differing in "
                  "hardware. In most cases you simply want to let Electrum "
                  "pick one at random.  However if you prefer feel free to "
                  "select a server manually.")
        choices = [_("Auto connect"), _("Select server manually")]
        choices_title = _("How do you want to connect to a server? ")
        clayout = ChoicesLayout(choices_title, choices)
        self.set_main_layout(clayout.layout(), title)
        auto_connect = True
        if clayout.selected_index() == 1:
            nlayout = NetworkChoiceLayout(network, self.config, wizard=True)
            if self.set_main_layout(nlayout.layout(), raise_on_cancel=False):
                nlayout.accept()
                auto_connect = False
        self.config.set_key('auto_connect', auto_connect, True)
        network.auto_connect = auto_connect

    @wizard_dialog
    def multisig_dialog(self, run_next):
        cw = CosignWidget(2, 2)
        m_edit = QSlider(Qt.Horizontal, self)
        n_edit = QSlider(Qt.Horizontal, self)
        n_edit.setMinimum(2)
        n_edit.setMaximum(15)
        m_edit.setMinimum(1)
        m_edit.setMaximum(2)
        n_edit.setValue(2)
        m_edit.setValue(2)
        n_label = QLabel()
        m_label = QLabel()
        grid = QGridLayout()
        grid.addWidget(n_label, 0, 0)
        grid.addWidget(n_edit, 0, 1)
        grid.addWidget(m_label, 1, 0)
        grid.addWidget(m_edit, 1, 1)
        def on_m(m):
            m_label.setText(_('Require %d signatures')%m)
            cw.set_m(m)
        def on_n(n):
            n_label.setText(_('From %d cosigners')%n)
            cw.set_n(n)
            m_edit.setMaximum(n)
        n_edit.valueChanged.connect(on_n)
        m_edit.valueChanged.connect(on_m)
        on_n(2)
        on_m(2)
        vbox = QVBoxLayout()
        vbox.addWidget(cw)
        vbox.addWidget(WWLabel(_("Choose the number of signatures needed to unlock funds in your wallet:")))
        vbox.addLayout(grid)
        self.set_main_layout(vbox, _("Multi-Signature Wallet"))
        m = int(m_edit.value())
        n = int(n_edit.value())
        return (m, n)