#!/usr/bin/env python3


# SAT: a jabber client
# Copyright (C) 2009-2021 Jérôme Poisson (goffi@goffi.org)

# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.

# This program 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 Affero General Public License for more details.

# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

""" template XMLUI parsing

XMLUI classes from this modules can then be iterated to create the template
"""

from functools import partial
from libervia.backend.core.log import getLogger
from libervia.frontends.tools import xmlui
from libervia.frontends.tools import jid
try:
    from jinja2 import Markup as safe
except ImportError:
    # Safe marks XHTML values as usable as it.
    # If jinja2 is not there, we can use a simple lamba
    safe = lambda x: x


log = getLogger(__name__)


## Widgets ##


class Widget(object):
    category = "widget"
    type = None
    enabled = True
    read_only = True

    def __init__(self, xmlui_parent):
        self.xmlui_parent = xmlui_parent

    @property
    def name(self):
        return self._xmlui_name


class ValueWidget(Widget):
    def __init__(self, xmlui_parent, value):
        super(ValueWidget, self).__init__(xmlui_parent)
        self.value = value

    @property
    def values(self):
        return [self.value]

    @property
    def labels(self):
        #  helper property, there is not label for ValueWidget
        # but using labels make rendering more easy (one single method to call)
        #  values are actually returned
        return [self.value]


class InputWidget(ValueWidget):
    def __init__(self, xmlui_parent, value, read_only=False):
        super(InputWidget, self).__init__(xmlui_parent, value)
        self.read_only = read_only


class OptionsWidget(Widget):
    def __init__(self, xmlui_parent, options, selected, style):
        super(OptionsWidget, self).__init__(xmlui_parent)
        self.options = options
        self.selected = selected
        self.style = style

    @property
    def values(self):
        for value, label in self.items:
            yield value

    @property
    def value(self):
        if self.multi or self.no_select or len(self.selected) != 1:
            raise ValueError(
                "Can't get value for list with multiple selections or nothing selected"
            )
        return self.selected[0]

    @property
    def labels(self):
        """return only labels from self.items"""
        for value, label in self.items:
            yield label

    @property
    def items(self):
        """return suitable items, according to style"""
        no_select = self.no_select
        for value, label in self.options:
            if no_select or value in self.selected:
                yield value, label

    @property
    def inline(self):
        return "inline" in self.style

    @property
    def no_select(self):
        return "noselect" in self.style

    @property
    def multi(self):
        return "multi" in self.style


class EmptyWidget(xmlui.EmptyWidget, Widget):
    def __init__(self, _xmlui_parent):
        Widget.__init__(self)


class TextWidget(xmlui.TextWidget, ValueWidget):
    type = "text"


class JidWidget(xmlui.JidWidget, ValueWidget):
    type = "jid"

    def __init__(self, xmlui_parent, value):
        self.value = jid.JID(value)


class LabelWidget(xmlui.LabelWidget, ValueWidget):
    type = "label"

    @property
    def for_name(self):
        try:
            return self._xmlui_for_name
        except AttributeError:
            return None


class StringWidget(xmlui.StringWidget, InputWidget):
    type = "string"


class JidInputWidget(xmlui.JidInputWidget, StringWidget):
    type = "jid"

class TextBoxWidget(xmlui.TextWidget, InputWidget):
    type = "textbox"


class XHTMLBoxWidget(xmlui.XHTMLBoxWidget, InputWidget):
    type = "xhtmlbox"

    def __init__(self, xmlui_parent, value, read_only=False):
        # XXX: XHTMLBoxWidget value must be cleaned (harmful XHTML must be removed)
        #      This is normally done in the backend, the frontends should not need to
        #      worry about it.
        super(XHTMLBoxWidget, self).__init__(
            xmlui_parent=xmlui_parent, value=safe(value), read_only=read_only)


class ListWidget(xmlui.ListWidget, OptionsWidget):
    type = "list"


## Containers ##


class Container(object):
    category = "container"
    type = None

    def __init__(self, xmlui_parent):
        self.xmlui_parent = xmlui_parent
        self.children = []

    def __iter__(self):
        return iter(self.children)

    def _xmlui_append(self, widget):
        self.children.append(widget)

    def _xmlui_remove(self, widget):
        self.children.remove(widget)


class VerticalContainer(xmlui.VerticalContainer, Container):
    type = "vertical"


class PairsContainer(xmlui.PairsContainer, Container):
    type = "pairs"


class LabelContainer(xmlui.PairsContainer, Container):
    type = "label"


## Factory ##


class WidgetFactory(object):

    def __getattr__(self, attr):
        if attr.startswith("create"):
            cls = globals()[attr[6:]]
            return cls


## Core ##


class XMLUIPanel(xmlui.XMLUIPanel):
    widget_factory = WidgetFactory()

    def show(self, *args, **kwargs):
        raise NotImplementedError


class XMLUIDialog(xmlui.XMLUIDialog):
    dialog_factory = WidgetFactory()

    def __init__(*args, **kwargs):
        raise NotImplementedError


create = partial(xmlui.create, class_map={
    xmlui.CLASS_PANEL: XMLUIPanel,
    xmlui.CLASS_DIALOG: XMLUIDialog})