# Copyright (C) 2019 Philipp Hörist <philipp AT hoerist.com>
#
# This file is part of the OpenPGP Gajim Plugin.
#
# OpenPGP Gajim Plugin 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; version 3 only.
#
# OpenPGP Gajim Plugin 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 OpenPGP Gajim Plugin. If not, see <http://www.gnu.org/licenses/>.

from __future__ import annotations

import logging
import time

from gi.repository import Gtk

from gajim.common import app
from gajim.gtk.dialogs import ConfirmationDialog
from gajim.gtk.dialogs import DialogButton
from gajim.gtk.util.misc import container_remove_all
from gajim.gtk.widgets import GajimAppWindow
from gajim.plugins.plugins_i18n import _

from openpgp.modules.key_store import KeyData
from openpgp.modules.util import Trust

log = logging.getLogger("gajim.p.openpgp.keydialog")

TRUST_DATA = {
    Trust.NOT_TRUSTED: ("dialog-error-symbolic", _("Not Trusted"), "error-color"),
    Trust.UNKNOWN: ("security-low-symbolic", _("Not Decided"), "warning-color"),
    Trust.BLIND: ("security-medium-symbolic", _("Blind Trust"), "encrypted-color"),
    Trust.VERIFIED: ("security-high-symbolic", _("Verified"), "encrypted-color"),
}


class KeyDialog(GajimAppWindow):
    def __init__(self, account: str, jid: str, transient: Gtk.Window) -> None:

        GajimAppWindow.__init__(
            self,
            name="PGPKeyDialog",
            title=_("Public Keys for %s") % jid,
            default_width=450,
            default_height=400,
            transient_for=transient,
            modal=True,
        )

        self.window.add_css_class("openpgp-key-dialog")

        self._client = app.get_client(account)

        self._listbox = Gtk.ListBox()
        self._listbox.set_selection_mode(Gtk.SelectionMode.NONE)

        self._scrolled = Gtk.ScrolledWindow(hexpand=True)
        self._scrolled.set_policy(Gtk.PolicyType.NEVER, Gtk.PolicyType.AUTOMATIC)
        self._scrolled.set_child(self._listbox)

        self.set_child(self._scrolled)

        keys = self._client.get_module("OpenPGP").get_keys(jid, only_trusted=False)
        for key in keys:
            log.info("Load: %s", key.fingerprint)
            self._listbox.append(KeyRow(key, self))

        self.show()

    def _cleanup(self) -> None:
        del self._client
        del self._listbox
        del self._scrolled


class KeyRow(Gtk.ListBoxRow):
    def __init__(self, key: KeyData, dialog: GajimAppWindow):
        Gtk.ListBoxRow.__init__(self)
        self.set_activatable(False)

        self._dialog = dialog
        self.key = key

        box = Gtk.Box()
        box.set_spacing(12)

        self._trust_button = Gtk.MenuButton()
        self._trust_button.set_popover(TrustPopver(self))
        self._update_button_state()
        box.append(self._trust_button)

        label_box = Gtk.Box(orientation=Gtk.Orientation.VERTICAL)
        fingerprint = Gtk.Label(label=self._format_fingerprint(key.fingerprint))
        fingerprint.get_style_context().add_class("openpgp-mono")
        if not key.active:
            fingerprint.get_style_context().add_class("openpgp-inactive-color")
        fingerprint.set_selectable(True)
        fingerprint.set_halign(Gtk.Align.START)
        fingerprint.set_valign(Gtk.Align.START)
        fingerprint.set_hexpand(True)
        label_box.append(fingerprint)

        date = Gtk.Label(label=self._format_timestamp(key.timestamp))
        date.set_halign(Gtk.Align.START)
        date.get_style_context().add_class("openpgp-mono")
        if not key.active:
            date.get_style_context().add_class("openpgp-inactive-color")
        label_box.append(date)

        box.append(label_box)
        self.set_child(box)

    def _update_button_state(self) -> None:
        icon_name, tooltip, css_class = TRUST_DATA[self.key.trust]
        self._trust_button.set_icon_name(icon_name)

        for css_cls in self._trust_button.get_css_classes():
            if css_cls.startswith("openpgp"):
                self._trust_button.remove_css_class(css_cls)

        if not self.key.active:
            css_class = "inactive-color"
            tooltip = "%s - %s" % (_("Inactive"), tooltip)

        self._trust_button.add_css_class(f"openpgp-{css_class}")
        self._trust_button.set_tooltip_text(tooltip)

    def delete_fingerprint(self):
        def _remove():
            self.get_parent().remove(self)
            self.key.delete()

        ConfirmationDialog(
            _("Delete Public Key?"),
            _("This will permanently delete this public key"),
            [
                DialogButton.make("Cancel"),
                DialogButton.make("Remove", text=_("Delete"), callback=_remove),
            ],
        ).show()

    def set_trust(self, trust: Trust) -> None:
        self.key.trust = trust
        self._update_button_state()

    @staticmethod
    def _format_fingerprint(fingerprint: str) -> str:
        fplen = len(fingerprint)
        wordsize = fplen // 8
        buf = ""
        for w in range(0, fplen, wordsize):
            buf += f"{fingerprint[w : w + wordsize]} "
        return buf.rstrip()

    @staticmethod
    def _format_timestamp(timestamp: float) -> str:
        return time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(timestamp))


class TrustPopver(Gtk.Popover):
    def __init__(self, row: KeyRow):
        Gtk.Popover.__init__(self)
        self._row = row
        self._listbox = Gtk.ListBox()
        self._listbox.set_selection_mode(Gtk.SelectionMode.NONE)
        if row.key.trust != Trust.VERIFIED:
            self._listbox.append(VerifiedOption())
        if row.key.trust != Trust.NOT_TRUSTED:
            self._listbox.append(NotTrustedOption())
        self._listbox.append(DeleteOption())
        self.set_child(self._listbox)
        self._listbox.connect("row-activated", self._activated)
        self.add_css_class("openpgp-trust-popover")

    def _activated(self, listbox: Gtk.ListBox, row: MenuOption) -> None:
        self.popdown()
        if row.type_ is None:
            self._row.delete_fingerprint()
        else:
            self._row.set_trust(row.type_)
            self.update()

    def update(self):
        container_remove_all(self._listbox)
        if self._row.key.trust != Trust.VERIFIED:
            self._listbox.append(VerifiedOption())
        if self._row.key.trust != Trust.NOT_TRUSTED:
            self._listbox.append(NotTrustedOption())
        self._listbox.append(DeleteOption())


class MenuOption(Gtk.ListBoxRow):

    type_: Trust | None
    icon: str
    label: str
    color: str

    def __init__(self):
        Gtk.ListBoxRow.__init__(self)
        box = Gtk.Box()
        box.set_spacing(6)

        image = Gtk.Image.new_from_icon_name(self.icon)
        if self.color:
            image.add_css_class(self.color)

        label = Gtk.Label(label=self.label)
        box.append(image)
        box.append(label)
        self.set_child(box)


class VerifiedOption(MenuOption):

    type_ = Trust.VERIFIED
    icon = "security-high-symbolic"
    label = _("Verified")
    color = "encrypted-color"

    def __init__(self):
        MenuOption.__init__(self)


class NotTrustedOption(MenuOption):

    type_ = Trust.NOT_TRUSTED
    icon = "dialog-error-symbolic"
    label = _("Not Trusted")
    color = "error-color"

    def __init__(self):
        MenuOption.__init__(self)


class DeleteOption(MenuOption):

    type_ = None
    icon = "user-trash-symbolic"
    label = _("Delete")
    color = ""

    def __init__(self):
        MenuOption.__init__(self)