#!/usr/bin/python
# -*- coding: utf-8 -*-

# Libervia: a Salut à Toi frontend
# Copyright (C) 2011, 2012, 2013, 2014 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/>.

import pyjd  # this is dummy in pyjs
from sat.core.log import getLogger
log = getLogger(__name__)
from sat_frontends.quick_frontend.quick_contact_list import QuickContactList
from pyjamas.ui.SimplePanel import SimplePanel
from pyjamas.ui.ScrollPanel import ScrollPanel
from pyjamas.ui.VerticalPanel import VerticalPanel
from pyjamas.ui.ClickListener import ClickHandler
from pyjamas.ui.Label import Label
from pyjamas.ui.HTML import HTML
from pyjamas.ui.Image import Image
from pyjamas import Window
from pyjamas import DOM
from __pyjamas__ import doc

from sat_frontends.tools import jid
from constants import Const as C
import base_widget
import html_tools
import chat
import blog


unicode = str # XXX: pyjama doesn't manage unicode


def buildPresenceStyle(presence, base_style=None):
    """Return the CSS classname to be used for displaying the given presence information.

    @param presence (unicode): presence is a value in ('', 'chat', 'away', 'dnd', 'xa')
    @param base_style (unicode): base classname
    @return: unicode
    """
    if not base_style:
        base_style = "contactLabel"
    return '%s-%s' % (base_style, presence or 'connected')


def setPresenceStyle(widget, presence, base_style=None):
    """
    Set the CSS style of a contact's element according to its presence.

    @param widget (Widget): the UI element of the contact
    @param presence (unicode): a value in ("", "chat", "away", "dnd", "xa").
    @param base_style (unicode): the base name of the style to apply
    """
    if not hasattr(widget, 'presence_style'):
        widget.presence_style = None
    style = buildPresenceStyle(presence, base_style)
    if style == widget.presence_style:
        return
    if widget.presence_style is not None:
        widget.removeStyleName(widget.presence_style)
    widget.addStyleName(style)
    widget.presence_style = style


class GroupLabel(base_widget.DragLabel, Label, ClickHandler):
    def __init__(self, host, group):
        """

        @param host (SatWebFrontend)
        @param group (unicode): group name
        """
        self.group = group
        Label.__init__(self, group)  # , Element=DOM.createElement('div')
        self.setStyleName('group')
        base_widget.DragLabel.__init__(self, group, "GROUP", host)
        ClickHandler.__init__(self)
        self.addClickListener(self)

    def onClick(self, sender):
        self.host.displayWidget(blog.MicroblogPanel, self.group)


class ContactLabel(HTML):
    """Display a contact in HTML, selecting best display (jid/nick/etc)"""

    def __init__(self, host, jid_):
        # TODO: add a listener for nick changes
        HTML.__init__(self)
        self.host = host
        self.jid = jid_.bare
        self.nick = self.host.contact_lists[C.PROF_KEY_NONE].getCache(self.jid, "nick")
        self.alert = False
        self.refresh()
        self.setStyleName('contactLabel')

    def refresh(self):
        alert_html = "<strong>(*)</strong>&nbsp;" if self.alert else ""
        contact_html = html_tools.html_sanitize(self.nick or unicode(self.jid))
        html = "%(alert)s%(contact)s" % {'alert': alert_html,
                                         'contact': contact_html}
        self.setHTML(html)

    def setAlert(self, alert):
        """Show a visual indicator

        @param alert: True if alert must be shown
        """
        self.alert = alert
        self.refresh()


class ContactMenuBar(base_widget.WidgetMenuBar):

    def onBrowserEvent(self, event):
        base_widget.WidgetMenuBar.onBrowserEvent(self, event)
        event.stopPropagation()  # prevent opening the chat dialog

    @classmethod
    def getCategoryHTML(cls, menu_name_i18n, type_):
        return '<img src="%s"/>' % C.DEFAULT_AVATAR_URL

    def setUrl(self, url):
        """Set the URL of the contact avatar."""
        self.items[0].setHTML('<img src="%s" />' % url)


class ContactBox(VerticalPanel, ClickHandler, base_widget.DragLabel):

    def __init__(self, parent, jid_):
        """
        @param parent (ContactPanel): ContactPanel hosting this box
        @param jid_ (jid.JID): contact JID
        """
        VerticalPanel.__init__(self, StyleName='contactBox', VerticalAlignment='middle')
        ClickHandler.__init__(self)
        base_widget.DragLabel.__init__(self, jid_, "CONTACT", parent.host)
        self.jid = jid_.bare
        self.label = ContactLabel(parent.host, self.jid)
        self.avatar = ContactMenuBar(self, parent.host) if parent.handle_menu else Image()
        self.updateAvatar(parent.host.getAvatarURL(self.jid))
        self.add(self.avatar)
        self.add(self.label)
        self.addClickListener(self)

    def addMenus(self, menu_bar):
        menu_bar.addCachedMenus(C.MENU_ROSTER_JID_CONTEXT, {'jid': unicode(self.jid)})
        menu_bar.addCachedMenus(C.MENU_JID_CONTEXT, {'jid': unicode(self.jid)})

    def setAlert(self, alert):
        """Show a visual indicator

        @param alert: True if alert indicator show be shown"""
        self.label.setAlert(alert)

    def updateAvatar(self, url):
        """Update the avatar.

        @param url (unicode): image url
        """
        self.avatar.setUrl(url)

    def onClick(self, sender):
        try:
            self.parent.onClick(self.jid)
        except AttributeError:
            pass
        else:
            self.setAlert(False)


class GroupPanel(VerticalPanel):

    def __init__(self, parent):
        VerticalPanel.__init__(self)
        self.setStyleName('groupPanel')
        self._parent = parent
        self._groups = set()

    def add(self, group):
        if group in self._groups:
            log.warning("trying to add an already existing group")
            return
        _item = GroupLabel(self._parent.host, group)
        _item.addMouseListener(self._parent)
        DOM.setStyleAttribute(_item.getElement(), "cursor", "pointer")
        index = 0
        for group_ in [child.group for child in self.getChildren()]:
            if group_ > group:
                break
            index += 1
        VerticalPanel.insert(self, _item, index)
        self._groups.add(group)

    def remove(self, group):
        for wid in self:
            if isinstance(wid, GroupLabel) and wid.group == group:
                VerticalPanel.remove(self, wid)
                self._groups.remove(group)
                return
        log.warning("Trying to remove a non existent group")

    def getGroupBox(self, group):
        """get the widget of a group

        @param group (unicode): the group
        @return: GroupLabel instance if present, else None"""
        for wid in self:
            if isinstance(wid, GroupLabel) and wid.group == group:
                return wid
        return None

    def getGroups(self):
        return self._groups


class BaseContactsPanel(VerticalPanel):
    """ContactList graphic representation

    Special features like popup menu panel or changing the contact states must be done in a sub-class.
    """

    def __init__(self, parent, handle_click=True, handle_menu=True):
        """@param on_click (callable): click callback (used if ContactBox is created)
        @param handle_menu (bool): if True, bind a popup menu to the avatar (used if ContactBox is created)
        """ # FIXME
        VerticalPanel.__init__(self)
        self._parent = parent
        self.host = parent.host
        self._contacts = {} # entity jid to ContactBox map
        self.click_listener = None
        self.handle_menu = handle_menu

        if handle_click:
            def cb(contact_jid):
                self.host.displayWidget(chat.Chat, contact_jid, type_=C.CHAT_ONE2ONE)
            self.onClick = cb

    def display(self, jids):
        """Display a contact in the list.

        @param jids (list[jid.JID]): jids to display (the order is kept)
        @param name (unicode): optional name of the contact
        """
        # FIXME: we do a full clear and add boxes after, we should only remove recently hidden boxes and add new ones, and re-order
        current = [box.jid for box in self.children if isinstance(box, ContactBox)]
        if current == jids:
            # the display doesn't change
            return
        self.clear()
        for jid_ in jids:
            assert isinstance(jid_, jid.JID)
            box = self.getContactBox(jid_)
            VerticalPanel.append(self, box)

    def isContactPresent(self, contact_jid):
        """Return True if a contact is present in the panel"""
        return contact_jid in self._contacts

    def getContacts(self):
        return self._contacts

    def getContactBox(self, contact_jid):
        """get the Contactbox of a contact

        if the Contactbox doesn't exists, it will be created
        @param contact_jid (jid.JID): the contact
        @return: ContactBox instance
        """
        try:
            return self._contacts[contact_jid.bare]
        except KeyError:
            box = ContactBox(self, contact_jid)
            self._contacts[contact_jid.bare] = box
            return box

    def updateAvatar(self, jid_, url):
        """Update the avatar of the given contact

        @param jid_ (jid.JID): contact jid
        @param url (unicode): image url
        """
        try:
            self.getContactBox(jid_).updateAvatar(url)
        except TypeError:
            pass


class ContactsPanel(BaseContactsPanel):
    """The contact list that is displayed on the left side."""

    def __init__(self, parent):
        BaseContactsPanel.__init__(self, parent, handle_click=True, handle_menu=True)

    def setState(self, jid_, type_, state):
        """Change the appearance of the contact, according to the state

        @param jid_ (jid.JID): jid.JID which need to change state
        @param type_ (unicode): one of "availability", "messageWaiting"
        @param state:
            - for messageWaiting type:
                True if message are waiting
            - for availability type:
                C.PRESENCE_UNAVAILABLE or None if not connected, else presence like RFC6121 #4.7.2.1"""
        assert type_ in ('availability', 'messageWaiting')
        contact_box = self.getContactBox(jid_)
        if type_ == 'availability':
            if state is None:
                state = C.PRESENCE_UNAVAILABLE
            setPresenceStyle(contact_box.label, state)
        elif type_ == 'messageWaiting':
            contact_box.setAlert(state)


class ContactTitleLabel(base_widget.DragLabel, Label, ClickHandler):

    def __init__(self, host, text):
        Label.__init__(self, text)  # , Element=DOM.createElement('div')
        self.setStyleName('contactTitle')
        base_widget.DragLabel.__init__(self, text, "CONTACT_TITLE", host)
        ClickHandler.__init__(self)
        self.addClickListener(self)

    def onClick(self, sender):
        self.host.displayWidget(blog.MicroblogPanel, None)


class ContactList(SimplePanel, QuickContactList):
    """Manage the contacts and groups"""

    def __init__(self, host):
        QuickContactList.__init__(self, host, C.PROF_KEY_NONE)
        SimplePanel.__init__(self)
        self.host = host
        self.scroll_panel = ScrollPanel()
        self.vPanel = VerticalPanel()
        _title = ContactTitleLabel(host, 'Contacts')
        DOM.setStyleAttribute(_title.getElement(), "cursor", "pointer")
        self._contacts_panel = ContactsPanel(self)
        self._contacts_panel.setStyleName('contactPanel') # FIXME: style doesn't exists !
        self._group_panel = GroupPanel(self)

        self.vPanel.add(_title)
        self.vPanel.add(self._group_panel)
        self.vPanel.add(self._contacts_panel)
        self.scroll_panel.add(self.vPanel)
        self.add(self.scroll_panel)
        self.setStyleName('contactList')
        Window.addWindowResizeListener(self)

        # FIXME: workaround for a pyjamas issue: calling hash on a class method always return a different value if that method is defined directly within the class (with the "def" keyword)
        self.avatarListener = self.onAvatarUpdate
        host.addListener('avatar', self.avatarListener, [C.PROF_KEY_NONE])

    @property
    def profile(self):
        return C.PROF_KEY_NONE

    def onDelete(self):
        QuickContactList.onDelete(self)
        self.host.removeListener('avatar', self.avatarListener)

    def update(self):
        ### GROUPS ###
        _keys = self._groups.keys()
        try:
            # XXX: Pyjamas doesn't do the set casting if None is present
            _keys.remove(None)
        except (KeyError, ValueError): # XXX: error raised depend on pyjama's compilation options
            pass
        current_groups = set(_keys)
        shown_groups = self._group_panel.getGroups()
        new_groups = current_groups.difference(shown_groups)
        removed_groups = shown_groups.difference(current_groups)
        for group in new_groups:
            self._group_panel.add(group)
        for group in removed_groups:
            self._group_panel.remove(group)

        ### JIDS ###
        to_show = [jid_ for jid_ in self._cache.keys() if self.entityToShow(jid_)]
        to_show.sort()

        self._contacts_panel.display(to_show)

        for jid_ in self._alerts:
            self._contacts_panel.setState(jid_, "messageWaiting", True)

    def onWindowResized(self, width, height):
        contact_panel_elt = self.getElement()
        # FIXME: still needed ?
        # classname = 'widgetsPanel' if isinstance(self.getParent().getParent(), panels.UniBoxPanel) else 'gwt-TabBar'
        classname = 'gwt-TabBar'
        _elts = doc().getElementsByClassName(classname)
        if not _elts.length:
            log.error("no element of class %s found, it should exist !" % classname)
            tab_bar_h = height
        else:
            tab_bar_h = DOM.getAbsoluteTop(_elts.item(0)) or height  # getAbsoluteTop can be 0 if tabBar is hidden

        ideal_height = tab_bar_h - DOM.getAbsoluteTop(contact_panel_elt) - 5
        self.scroll_panel.setHeight("%s%s" % (ideal_height, "px"))

    # def updateContact(self, jid_s, attributes, groups):
    #     """Add a contact to the panel if it doesn't exist, update it else

    #     @param jid_s: jid userhost as unicode
    #     @param attributes: cf SàT Bridge API's newContact
    #     @param groups: list of groups"""
    #     _current_groups = self.getContactGroups(jid_s)
    #     _new_groups = set(groups)
    #     _key = "@%s: "

    #     for group in _current_groups.difference(_new_groups):
    #         # We remove the contact from the groups where he isn't anymore
    #         self.groups[group].remove(jid_s)
    #         if not self.groups[group]:
    #             # The group is now empty, we must remove it
    #             del self.groups[group]
    #             self._group_panel.remove(group)
    #             if self.host.uni_box:
    #                 self.host.uni_box.removeKey(_key % group)

    #     for group in _new_groups.difference(_current_groups):
    #         # We add the contact to the groups he joined
    #         if group not in self.groups.keys():
    #             self.groups[group] = set()
    #             self._group_panel.add(group)
    #             if self.host.uni_box:
    #                 self.host.uni_box.addKey(_key % group)
    #         self.groups[group].add(jid_s)

    #     # We add the contact to contact list, it will check if contact already exists
    #     self._contacts_panel.add(jid_s)
    #     self.updateVisibility([jid_s], self.getContactGroups(jid_s))

    # def removeContact(self, jid):
    #     """Remove contacts from groups where he is and contact list"""
    #     self.updateContact(jid, {}, [])  # we remove contact from every group
    #     self._contacts_panel.remove(jid)

    # def setConnected(self, jid_s, resource, availability, priority, statuses):
    #     """Set connection status
    #     @param jid_s (unicode): JID userhost as unicode
    #     """
    #     if availability == 'unavailable':
    #         if jid_s in self.connected:
    #             if resource in self.connected[jid_s]:
    #                 del self.connected[jid_s][resource]
    #             if not self.connected[jid_s]:
    #                 del self.connected[jid_s]
    #     else:
    #         if jid_s not in self.connected:
    #             self.connected[jid_s] = {}
    #         self.connected[jid_s][resource] = (availability, priority, statuses)

    #     # check if the contact is connected with another resource, use the one with highest priority
    #     if jid_s in self.connected:
    #         max_resource = max_priority = None
    #         for tmp_resource in self.connected[jid_s]:
    #             if max_priority is None or self.connected[jid_s][tmp_resource][1] >= max_priority:
    #                 max_resource = tmp_resource
    #                 max_priority = self.connected[jid_s][tmp_resource][1]
    #         if availability == "unavailable":  # do not check the priority here, because 'unavailable' has a dummy one
    #             priority = max_priority
    #             availability = self.connected[jid_s][max_resource][0]
    #     if jid_s not in self.connected or priority >= max_priority:
    #         # case 1: jid not in self.connected means all resources are disconnected, update with 'unavailable'
    #         # case 2: update (or confirm) with the values of the resource which takes precedence
    #         self._contacts_panel.setState(jid_s, "availability", availability)

    #     self.updateVisibility([jid_s], self.getContactGroups(jid_s))

    def setContactMessageWaiting(self, jid, waiting):
        """Show a visual indicator that contact has send a message

        @param jid: jid of the contact
        @param waiting: True if message are waiting"""
        raise Exception("Should not be there")
        # self._contacts_panel.setState(jid, "messageWaiting", waiting)

    # def getConnected(self, filter_muc=False):
    #     """return a list of all jid (bare jid) connected
    #     @param filter_muc: if True, remove the groups from the list
    #     """
    #     contacts = self.connected.keys()
    #     contacts.sort()
    #     return contacts if not filter_muc else list(set(contacts).intersection(set(self.getContacts())))

    # def getContactGroups(self, contact_jid_s):
    #     """Get groups where contact is
    #    @param group: string of single group, or list of string
    #    @param contact_jid_s: jid to test, as unicode
    #     """
    #     result = set()
    #     for group in self.groups:
    #         if self.isContactInGroup(group, contact_jid_s):
    #             result.add(group)
    #     return result

    # def isContactInGroup(self, group, contact_jid):
    #     """Test if the contact_jid is in the group
    #     @param group: string of single group, or list of string
    #     @param contact_jid: jid to test
    #     @return: True if contact_jid is in on of the groups"""
    #     if group in self.groups and contact_jid in self.groups[group]:
    #         return True
    #     return False

    def isContactInRoster(self, contact_jid):
        """Test if the contact is in our roster list"""
        for contact_box in self._contacts_panel:
            if contact_jid == contact_box.jid:
                return True
        return False

    # def getContacts(self):
    #     return self._contacts_panel.getContacts()

    def getGroups(self):
        return self.groups.keys()

    def onMouseMove(self, sender, x, y):
        pass

    def onMouseDown(self, sender, x, y):
        pass

    def onMouseUp(self, sender, x, y):
        pass

    def onMouseEnter(self, sender):
        if isinstance(sender, GroupLabel):
            jids = self.getGroupData(sender.group, "jids")
            for contact in self._contacts_panel:
                if contact.jid in jids:
                    contact.label.addStyleName("selected")

    def onMouseLeave(self, sender):
        if isinstance(sender, GroupLabel):
            jids = self.getGroupData(sender.group, "jids")
            for contact in self._contacts_panel:
                if contact.jid in jids:
                    contact.label.removeStyleName("selected")

    def updateAvatar(self, jid_s, url):
        """Update the avatar of the given contact

        @param jid_s (unicode): contact jid
        @param url (unicode): image url
        """
        self._contacts_panel.updateAvatar(jid_s, url)

    def onAvatarUpdate(self, jid_, hash_):
        """Called on avatar update events

        @param jid_: jid of the entity with updated avatar
        @param hash_: hash of the avatar
        """
        self._contacts_panel.updateAvatar(jid_, self.host.getAvatarURL(jid_))

    def hasVisibleMembers(self, group):
        """Tell if the given group actually has visible members

        @param group (unicode): the group to check
        @return: boolean
        """
        raise Exception # FIXME: remove this method
        for jid_ in self.groups[group]:
            if self._contacts_panel.getContactBox(jid_).isVisible():
                return True
        return False

    def offlineContactsToShow(self):
        """Tell if offline contacts should be visible according to the user settings

        @return: boolean
        """
        return C.bool(self.host.getCachedParam('General', C.SHOW_OFFLINE_CONTACTS))

    def emtyGroupsToShow(self):
        """Tell if empty groups should be visible according to the user settings

        @return: boolean
        """
        return C.bool(self.host.getCachedParam('General', C.SHOW_EMPTY_GROUPS))

    def updatePresence(self, entity, show, priority, statuses):
        QuickContactList.updatePresence(self, entity, show, priority, statuses)
        entity_bare = entity.bare
        show = self.getCache(entity_bare, C.PRESENCE_SHOW) # we use cache to have the show nformation of main resource only
        self._contacts_panel.setState(entity_bare, "availability", show)
        self.update()

    # def updateVisibility(self, jids, groups):
    #     """Set the widgets visibility for the given contacts and groups

    #     @param jids (list[unicode]): list of JID
    #     @param groups (list[unicode]): list of groups
    #     """
    #     for jid_s in jids:
    #         try:
    #             self._contacts_panel.getContactBox(jid_s).setVisible(jid_s in self.connected or self.offlineContactsToShow())
    #         except TypeError:
    #             log.warning('No box for contact %s: this code line should not be reached' % jid_s)
    #     for group in groups:
    #         try:
    #             self._group_panel.getGroupBox(group).setVisible(self.hasVisibleMembers(group) or self.emtyGroupsToShow())
    #         except TypeError:
    #             log.warning('No box for group %s: this code line should not be reached' % group)

    # def refresh(self):
    #     """Show or hide disconnected contacts and empty groups"""
    #     self.updateVisibility(self._contacts_panel.contacts, self.groups.keys())


class JIDList(list):
    """JID-friendly list implementation for Pyjamas"""

    def __contains__(self, item):
        """Tells if the list contains the given item.

        @param item (object): element to check
        @return: bool
        """
        # Since our JID doesn't inherit from str/unicode, without this method
        # the test would return True only when the objects references are the
        # same. Tests have shown that the other iterable "set" and "dict" don't
        # need this hack to reproduce the Twisted's behavior.
        for other in self:
            if other == item:
                return True
        return False