import time, os
from functools import partial
import copy

from PyQt5.QtCore import Qt, pyqtSignal
from PyQt5.QtWidgets import QPushButton, QLabel, QVBoxLayout, QWidget, QGridLayout

from electrum.gui.qt.util import (WindowModalDialog, CloseButton, Buttons, getOpenFileName,
                                  getSaveFileName)
from electrum.gui.qt.transaction_dialog import TxDialog
from electrum.gui.qt.main_window import ElectrumWindow

from electrum.i18n import _
from electrum.plugin import hook
from electrum.wallet import Multisig_Wallet
from electrum.transaction import PartialTransaction

from .coldcard import ColdcardPlugin, xfp2str
from ..hw_wallet.qt import QtHandlerBase, QtPluginBase
from ..hw_wallet.plugin import only_hook_if_libraries_available


CC_DEBUG = False

class Plugin(ColdcardPlugin, QtPluginBase):
    icon_unpaired = "coldcard_unpaired.png"
    icon_paired = "coldcard.png"

    def create_handler(self, window):
        return Coldcard_Handler(window)

    @only_hook_if_libraries_available
    @hook
    def receive_menu(self, menu, addrs, wallet):
        # Context menu on each address in the Addresses Tab, right click...
        if len(addrs) != 1:
            return
        for keystore in wallet.get_keystores():
            if type(keystore) == self.keystore_class:
                def show_address(keystore=keystore):
                    keystore.thread.add(partial(self.show_address, wallet, addrs[0], keystore=keystore))
                device_name = "{} ({})".format(self.device, keystore.label)
                menu.addAction(_("Show on {}").format(device_name), show_address)

    @only_hook_if_libraries_available
    @hook
    def wallet_info_buttons(self, main_window, dialog):
        # user is about to see the "Wallet Information" dialog
        # - add a button if multisig wallet, and a Coldcard is a cosigner.
        wallet = main_window.wallet

        if type(wallet) is not Multisig_Wallet:
            return

        if not any(type(ks) == self.keystore_class for ks in wallet.get_keystores()):
            # doesn't involve a Coldcard wallet, hide feature
            return

        btn = QPushButton(_("Export for Coldcard"))
        btn.clicked.connect(lambda unused: self.export_multisig_setup(main_window, wallet))

        return btn

    def export_multisig_setup(self, main_window, wallet):

        basename = wallet.basename().rsplit('.', 1)[0]        # trim .json
        name = f'{basename}-cc-export.txt'.replace(' ', '-')
        fileName = getSaveFileName(
            parent=main_window,
            title=_("Select where to save the setup file"),
            filename=name,
            filter="*.txt",
            config=self.config,
        )
        if fileName:
            with open(fileName, "wt") as f:
                ColdcardPlugin.export_ms_wallet(wallet, f, basename)
            main_window.show_message(_("Wallet setup file exported successfully"))

    def show_settings_dialog(self, window, keystore):
        # When they click on the icon for CC we come here.
        # - doesn't matter if device not connected, continue
        CKCCSettingsDialog(window, self, keystore).exec_()


class Coldcard_Handler(QtHandlerBase):
    MESSAGE_DIALOG_TITLE = _("Coldcard Status")

    def __init__(self, win):
        super(Coldcard_Handler, self).__init__(win, 'Coldcard')


class CKCCSettingsDialog(WindowModalDialog):

    def __init__(self, window: ElectrumWindow, plugin, keystore):
        title = _("{} Settings").format(plugin.device)
        super(CKCCSettingsDialog, self).__init__(window, title)
        self.setMaximumWidth(540)

        # Note: Coldcard may **not** be connected at present time. Keep working!

        devmgr = plugin.device_manager()
        #config = devmgr.config
        #handler = keystore.handler
        self.thread = thread = keystore.thread
        self.keystore = keystore
        assert isinstance(window, ElectrumWindow), f"{type(window)}"
        self.window = window

        def connect_and_doit():
            # Attempt connection to device, or raise.
            device_id = plugin.choose_device(window, keystore)
            if not device_id:
                raise RuntimeError("Device not connected")
            client = devmgr.client_by_id(device_id)
            if not client:
                raise RuntimeError("Device not connected")
            return client

        body = QWidget()
        body_layout = QVBoxLayout(body)
        grid = QGridLayout()
        grid.setColumnStretch(2, 1)

        # see <http://doc.qt.io/archives/qt-4.8/richtext-html-subset.html>
        title = QLabel('''<center>
<span style="font-size: x-large">Coldcard Wallet</span>
<br><span style="font-size: medium">from Coinkite Inc.</span>
<br><a href="https://coldcardwallet.com">coldcardwallet.com</a>''')
        title.setTextInteractionFlags(Qt.LinksAccessibleByMouse)

        grid.addWidget(title, 0,0, 1,2, Qt.AlignHCenter)
        y = 3

        rows = [
            ('xfp', _("Master Fingerprint")),
            ('serial', _("USB Serial")),
            ('fw_version', _("Firmware Version")),
            ('fw_built', _("Build Date")),
            ('bl_version', _("Bootloader")),
        ]
        for row_num, (member_name, label) in enumerate(rows):
            # XXX we know xfp already, even if not connected
            widget = QLabel('<tt>000000000000')
            widget.setTextInteractionFlags(Qt.TextSelectableByMouse | Qt.TextSelectableByKeyboard)

            grid.addWidget(QLabel(label), y, 0, 1,1, Qt.AlignRight)
            grid.addWidget(widget, y, 1, 1, 1, Qt.AlignLeft)
            setattr(self, member_name, widget)
            y += 1
        body_layout.addLayout(grid)

        upg_btn = QPushButton(_('Upgrade'))
        #upg_btn.setDefault(False)
        def _start_upgrade():
            thread.add(connect_and_doit, on_success=self.start_upgrade)
        upg_btn.clicked.connect(_start_upgrade)

        y += 3
        grid.addWidget(upg_btn, y, 0)
        grid.addWidget(CloseButton(self), y, 1)

        dialog_vbox = QVBoxLayout(self)
        dialog_vbox.addWidget(body)

        # Fetch firmware/versions values and show them.
        thread.add(connect_and_doit, on_success=self.show_values, on_error=self.show_placeholders)

    def show_placeholders(self, unclear_arg):
        # device missing, so hide lots of detail.
        self.xfp.setText('<tt>%s' % self.keystore.get_root_fingerprint())
        self.serial.setText('(not connected)')
        self.fw_version.setText('')
        self.fw_built.setText('')
        self.bl_version.setText('')

    def show_values(self, client):

        dev = client.dev

        self.xfp.setText('<tt>%s' % xfp2str(dev.master_fingerprint))
        self.serial.setText('<tt>%s' % dev.serial)

        # ask device for versions: allow extras for future
        fw_date, fw_rel, bl_rel, *rfu = client.get_version()

        self.fw_version.setText('<tt>%s' % fw_rel)
        self.fw_built.setText('<tt>%s' % fw_date)
        self.bl_version.setText('<tt>%s' % bl_rel)

    def start_upgrade(self, client):
        # ask for a filename (must have already downloaded it)
        dev = client.dev

        fileName = getOpenFileName(
            parent=self,
            title="Select upgraded firmware file",
            filter="*.dfu",
            config=self.window.config,
        )
        if not fileName:
            return

        from ckcc.utils import dfu_parse
        from ckcc.sigheader import FW_HEADER_SIZE, FW_HEADER_OFFSET, FW_HEADER_MAGIC
        from ckcc.protocol import CCProtocolPacker
        from hashlib import sha256
        import struct

        try:
            with open(fileName, 'rb') as fd:

                # unwrap firmware from the DFU
                offset, size, *ignored = dfu_parse(fd)

                fd.seek(offset)
                firmware = fd.read(size)

            hpos = FW_HEADER_OFFSET
            hdr = bytes(firmware[hpos:hpos + FW_HEADER_SIZE])        # needed later too
            magic = struct.unpack_from("<I", hdr)[0]

            if magic != FW_HEADER_MAGIC:
                raise ValueError("Bad magic")
        except Exception as exc:
            self.window.show_error("Does not appear to be a Coldcard firmware file.\n\n%s" % exc)
            return

        # TODO:
        # - detect if they are trying to downgrade; aint gonna work
        # - warn them about the reboot?
        # - length checks
        # - add progress local bar
        self.window.show_message("Ready to Upgrade.\n\nBe patient. Unit will reboot itself when complete.")

        def doit():
            dlen, _ = dev.upload_file(firmware, verify=True)
            assert dlen == len(firmware)

            # append the firmware header a second time
            result = dev.send_recv(CCProtocolPacker.upload(size, size+FW_HEADER_SIZE, hdr))

            # make it reboot into bootlaoder which might install it
            dev.send_recv(CCProtocolPacker.reboot())

        self.thread.add(doit)
        self.close()