# Copyright 2021 Vincent Texier <vit@free.fr>
#
# This software is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This software is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
import logging
import sys
from typing import Optional

from duniterpy.key import SigningKey
from PyQt5.QtCore import QTimer
from PyQt5.QtGui import QFont
from PyQt5.QtWidgets import QApplication, QDialog, QLineEdit, QWidget
from substrateinterface import Keypair, KeypairType

from tikka.domains.application import Application
from tikka.domains.entities.constants import DATA_PATH, WALLETS_PASSWORD_LENGTH
from tikka.libs.secret import generate_alphabetic
from tikka.slots.pyqt.entities.constants import (
    ADDRESS_MONOSPACE_FONT_NAME,
    DEBOUNCE_TIME,
)
from tikka.slots.pyqt.resources.gui.windows.v1_account_import_rc import (
    Ui_V1AccountImportDialog,
)


class V1AccountImportWindow(QDialog, Ui_V1AccountImportDialog):
    """
    V1AccountImportWindow class
    """

    def __init__(self, application: Application, parent: Optional[QWidget] = None):
        """
        Init import V1 account window

        :param application: Application instance
        :param parent: QWidget instance
        """
        super().__init__(parent=parent)
        self.setupUi(self)

        self.application = application
        self._ = self.application.translator.gettext

        # set monospace font to address fields
        monospace_font = QFont(ADDRESS_MONOSPACE_FONT_NAME)
        monospace_font.setStyleHint(QFont.Monospace)
        self.addressValueLabel.setFont(monospace_font)
        self.v1AddressValueLabel.setFont(monospace_font)

        # buttons
        self.buttonBox.button(self.buttonBox.Ok).setEnabled(False)

        # events
        self.secretIDLineEdit.textChanged.connect(self._on_secret_id_line_edit_changed)
        self.passwordIDLineEdit.textChanged.connect(
            self._on_password_id_line_edit_changed
        )

        self.showButton.clicked.connect(self.on_show_button_clicked)
        self.passwordChangeButton.clicked.connect(self._generate_wallet_password)
        self.buttonBox.accepted.connect(self.on_accepted_button)
        self.buttonBox.rejected.connect(self.close)

        # debounce timer on self._generate_address()
        self.debounce_timer = QTimer()
        self.debounce_timer.timeout.connect(self._generate_address)

        # fill form
        self._generate_wallet_password()

    def _on_secret_id_line_edit_changed(self):
        """
        Triggered when text is changed in the secret ID field

        :return:
        """
        if self.debounce_timer.isActive():
            self.debounce_timer.stop()
        self.debounce_timer.start(DEBOUNCE_TIME)

    def _on_password_id_line_edit_changed(self):
        """
        Triggered when text is changed in the password ID field

        :return:
        """
        if self.debounce_timer.isActive():
            self.debounce_timer.stop()
        self.debounce_timer.start(DEBOUNCE_TIME)

    def _generate_address(self):
        """
        Generate address from ID

        :return:
        """
        # stop debounce_timer to avoid infinite loop
        if self.debounce_timer.isActive():
            self.debounce_timer.stop()

        self.v1AddressValueLabel.setText("")
        self.addressValueLabel.setText("")
        self.errorLabel.setText("")
        self.buttonBox.button(self.buttonBox.Ok).setEnabled(False)

        secret_id = self.secretIDLineEdit.text().strip()
        password_id = self.passwordIDLineEdit.text().strip()
        if secret_id == "" or password_id == "":
            return

        signing_key = SigningKey.from_credentials(secret_id, password_id)
        try:
            address = Keypair.create_from_seed(
                seed_hex=signing_key.seed.hex(),
                ss58_format=self.application.currencies.get_current().ss58_format,
                crypto_type=KeypairType.ED25519,
            ).ss58_address
        except Exception as exception:
            logging.exception(exception)
            self.errorLabel.setText(self._("Error generating account wallet!"))
            return

        self.addressValueLabel.setText(address)
        self.v1AddressValueLabel.setText(signing_key.pubkey)

        if self.application.accounts.get_by_address(address) is not None:
            self.errorLabel.setText(self._("Account already exists!"))
            self.buttonBox.button(self.buttonBox.Ok).setEnabled(False)
        else:
            self.errorLabel.setText("")
            self.buttonBox.button(self.buttonBox.Ok).setEnabled(True)

    def on_show_button_clicked(self):
        """
        Triggered when user click on show button

        :return:
        """
        if self.secretIDLineEdit.echoMode() == QLineEdit.Password:
            self.secretIDLineEdit.setEchoMode(QLineEdit.Normal)
            self.passwordIDLineEdit.setEchoMode(QLineEdit.Normal)
            self.showButton.setText(self._("Hide"))
        else:
            self.secretIDLineEdit.setEchoMode(QLineEdit.Password)
            self.passwordIDLineEdit.setEchoMode(QLineEdit.Password)
            self.showButton.setText(self._("Show"))

    def _generate_wallet_password(self):
        """
        Generate new password for wallet encryption in UI

        :return:
        """
        self.passwordLineEdit.setText(generate_alphabetic(WALLETS_PASSWORD_LENGTH))

    def on_accepted_button(self):
        """
        Triggered when user click on ok button

        :return:
        """
        secret_id = self.secretIDLineEdit.text().strip()
        password_id = self.passwordIDLineEdit.text().strip()
        password = self.passwordLineEdit.text()
        name = self.nameLineEdit.text().strip()

        self.application.accounts.create_new_root_account_v1_from_credentials(
            secret_id, password_id, name, password
        )


if __name__ == "__main__":
    qapp = QApplication(sys.argv)
    application_ = Application(DATA_PATH)
    V1AccountImportWindow(application_).exec_()
