NomadNet/nomadnet/ui/textui/Conversations.py

import RNS
import os
import time
import nomadnet
import LXMF

import urwid

from datetime import datetime
from nomadnet.Directory import DirectoryEntry
from nomadnet.vendor.additional_urwid_widgets import IndicativeListBox

class ConversationListDisplayShortcuts():
    def __init__(self, app):
        self.app = app

        self.widget = urwid.AttrMap(urwid.Text("[Enter] Open  [C-e] Peer Info  [C-x] Delete  [C-r] Sync  [C-n] New"), "shortcutbar")

class ConversationDisplayShortcuts():
    def __init__(self, app):
        self.app = app

        self.widget = urwid.AttrMap(urwid.Text("[C-d] Send  [C-k] Clear  [C-w] Close  [C-t] Title  [C-p] Purge  [C-x] Clear History  [C-o] Sort"), "shortcutbar")

class ConversationsArea(urwid.LineBox):
    def keypress(self, size, key):
        if key == "ctrl e":
            self.delegate.edit_selected_in_directory()
        elif key == "ctrl x":
            self.delegate.delete_selected_conversation()
        elif key == "ctrl n":
            self.delegate.new_conversation()
        elif key == "ctrl r":
            self.delegate.sync_conversations()
        elif key == "tab":
            self.delegate.app.ui.main_display.frame.set_focus("header")
        elif key == "up" and (self.delegate.ilb.first_item_is_selected() or self.delegate.ilb.body_is_empty()):
            self.delegate.app.ui.main_display.frame.set_focus("header")
        else:
            return super(ConversationsArea, self).keypress(size, key)

class DialogLineBox(urwid.LineBox):
    def keypress(self, size, key):
        if key == "esc":
            self.delegate.update_conversation_list()
        else:
            return super(DialogLineBox, self).keypress(size, key)

class ConversationsDisplay():
    list_width = 0.33
    cached_conversation_widgets = {}

    def __init__(self, app):
        self.app = app
        self.dialog_open = False
        self.sync_dialog = None
        self.currently_displayed_conversation = None

        def disp_list_shortcuts(sender, arg1, arg2):
            self.shortcuts_display = self.list_shortcuts
            self.app.ui.main_display.update_active_shortcuts()

        self.update_listbox()

        self.columns_widget = urwid.Columns(
            [
                ("weight", ConversationsDisplay.list_width, self.listbox),
                ("weight", 1-ConversationsDisplay.list_width, self.make_conversation_widget(None))
            ],
            dividechars=0, focus_column=0, box_columns=[0]
        )

        self.list_shortcuts = ConversationListDisplayShortcuts(self.app)
        self.editor_shortcuts = ConversationDisplayShortcuts(self.app)

        self.shortcuts_display = self.list_shortcuts
        self.widget = self.columns_widget
        nomadnet.Conversation.created_callback = self.update_conversation_list

    def focus_change_event(self):
        # This hack corrects buggy styling behaviour in IndicativeListBox
        if not self.dialog_open:
            ilb_position = self.ilb.get_selected_position()
            self.update_conversation_list()
            if ilb_position != None:
                self.ilb.select_item(ilb_position)

    def update_listbox(self):
        conversation_list_widgets = []
        for conversation in self.app.conversations():
            conversation_list_widgets.append(self.conversation_list_widget(conversation))

        self.list_widgets = conversation_list_widgets
        self.ilb = IndicativeListBox(
            self.list_widgets,
            on_selection_change=self.conversation_list_selection,
            initialization_is_selection_change=False,
            highlight_offFocus="list_off_focus"
        )

        self.listbox = ConversationsArea(urwid.Filler(self.ilb, height=("relative", 100)), title="Conversations")
        self.listbox.delegate = self

    def delete_selected_conversation(self):
        self.dialog_open = True
        source_hash = self.ilb.get_selected_item().source_hash

        def dismiss_dialog(sender):
            self.update_conversation_list()
            self.dialog_open = False

        def confirmed(sender):
            self.dialog_open = False
            self.delete_conversation(source_hash)
            nomadnet.Conversation.delete_conversation(source_hash, self.app)
            self.update_conversation_list()

        dialog = DialogLineBox(
            urwid.Pile([
                urwid.Text("Delete conversation with\n"+self.app.directory.simplest_display_str(bytes.fromhex(source_hash))+"\n", align="center"),
                urwid.Columns([("weight", 0.45, urwid.Button("Yes", on_press=confirmed)), ("weight", 0.1, urwid.Text("")), ("weight", 0.45, urwid.Button("No", on_press=dismiss_dialog))])
            ]), title="?"
        )
        dialog.delegate = self
        bottom = self.listbox

        overlay = urwid.Overlay(dialog, bottom, align="center", width=("relative", 100), valign="middle", height="pack", left=2, right=2)

        options = self.columns_widget.options("weight", ConversationsDisplay.list_width)
        self.columns_widget.contents[0] = (overlay, options)

    def edit_selected_in_directory(self):
        g = self.app.ui.glyphs
        self.dialog_open = True
        source_hash_text = self.ilb.get_selected_item().source_hash
        display_name = self.ilb.get_selected_item().display_name
        if display_name == None:
            display_name = ""

        e_id = urwid.Edit(caption="Addr : ",edit_text=source_hash_text)
        t_id = urwid.Text("Addr : "+source_hash_text)
        e_name = urwid.Edit(caption="Name : ",edit_text=display_name)

        selected_id_widget = t_id

        untrusted_selected  = False
        unknown_selected    = True
        trusted_selected    = False

        direct_selected     = True
        propagated_selected = False

        try:
            if self.app.directory.find(bytes.fromhex(source_hash_text)):
                trust_level = self.app.directory.trust_level(bytes.fromhex(source_hash_text))
                if trust_level == DirectoryEntry.UNTRUSTED:
                    untrusted_selected = True
                    unknown_selected   = False
                    trusted_selected   = False
                elif trust_level == DirectoryEntry.UNKNOWN:
                    untrusted_selected = False
                    unknown_selected   = True
                    trusted_selected   = False
                elif trust_level == DirectoryEntry.TRUSTED:
                    untrusted_selected = False
                    unknown_selected   = False
                    trusted_selected   = True

                if self.app.directory.preferred_delivery(bytes.fromhex(source_hash_text)) == DirectoryEntry.PROPAGATED:
                    direct_selected = False
                    propagated_selected = True
                    
        except Exception as e:
            pass

        trust_button_group = []
        r_untrusted = urwid.RadioButton(trust_button_group, "Untrusted", state=untrusted_selected)
        r_unknown   = urwid.RadioButton(trust_button_group, "Unknown", state=unknown_selected)
        r_trusted   = urwid.RadioButton(trust_button_group, "Trusted", state=trusted_selected)

        method_button_group = []
        r_direct     = urwid.RadioButton(method_button_group, "Deliver directly", state=direct_selected)
        r_propagated = urwid.RadioButton(method_button_group, "Use propagation nodes", state=propagated_selected)

        def dismiss_dialog(sender):
            self.update_conversation_list()
            self.dialog_open = False

        def confirmed(sender):
            try:
                display_name = e_name.get_edit_text()
                source_hash = bytes.fromhex(e_id.get_edit_text())
                trust_level = DirectoryEntry.UNTRUSTED
                if r_unknown.state == True:
                    trust_level = DirectoryEntry.UNKNOWN
                elif r_trusted.state == True:
                    trust_level = DirectoryEntry.TRUSTED

                delivery = DirectoryEntry.DIRECT
                if r_propagated.state == True:
                    delivery = DirectoryEntry.PROPAGATED

                entry = DirectoryEntry(source_hash, display_name, trust_level, preferred_delivery=delivery)
                self.app.directory.remember(entry)
                self.update_conversation_list()
                self.dialog_open = False
                self.app.ui.main_display.sub_displays.network_display.directory_change_callback()
            except Exception as e:
                RNS.log("Could not save directory entry. The contained exception was: "+str(e), RNS.LOG_VERBOSE)
                if not dialog_pile.error_display:
                    dialog_pile.error_display = True
                    options = dialog_pile.options(height_type="pack")
                    dialog_pile.contents.append((urwid.Text(""), options))
                    dialog_pile.contents.append((urwid.Text(("error_text", "Could not save entry. Check your input."), align="center"), options))

        source_is_known = self.app.directory.is_known(bytes.fromhex(source_hash_text))
        if source_is_known:
            known_section = urwid.Divider(g["divider1"])
        else:
            def query_action(sender, user_data):
                self.close_conversation_by_hash(user_data)
                nomadnet.Conversation.query_for_peer(user_data)
                options = dialog_pile.options(height_type="pack")
                dialog_pile.contents = [
                    (urwid.Text("Query sent"), options),
                    (urwid.Button("OK", on_press=dismiss_dialog), options)
                ]
            query_button = urwid.Button("Query network for keys", on_press=query_action, user_data=source_hash_text)
            known_section = urwid.Pile([urwid.Divider(g["divider1"]), urwid.Text(g["info"]+"\n", align="center"), urwid.Text("The identity of this peer is not known, and you cannot currently communicate.\n", align="center"), query_button, urwid.Divider(g["divider1"])])

        dialog_pile = urwid.Pile([
            selected_id_widget,
            e_name,
            urwid.Divider(g["divider1"]),
            r_untrusted,
            r_unknown,
            r_trusted,
            urwid.Divider(g["divider1"]),
            r_direct,
            r_propagated,
            known_section,
            urwid.Columns([("weight", 0.45, urwid.Button("Save", on_press=confirmed)), ("weight", 0.1, urwid.Text("")), ("weight", 0.45, urwid.Button("Back", on_press=dismiss_dialog))])
        ])
        dialog_pile.error_display = False

        dialog = DialogLineBox(dialog_pile, title="Peer Info")
        dialog.delegate = self
        bottom = self.listbox

        overlay = urwid.Overlay(dialog, bottom, align="center", width=("relative", 100), valign="middle", height="pack", left=2, right=2)

        options = self.columns_widget.options("weight", ConversationsDisplay.list_width)
        self.columns_widget.contents[0] = (overlay, options)

    def new_conversation(self):
        self.dialog_open = True
        source_hash = ""
        display_name = ""

        e_id = urwid.Edit(caption="Addr : ",edit_text=source_hash)
        e_name = urwid.Edit(caption="Name : ",edit_text=display_name)

        trust_button_group = []
        r_untrusted = urwid.RadioButton(trust_button_group, "Untrusted")
        r_unknown   = urwid.RadioButton(trust_button_group, "Unknown", state=True)
        r_trusted   = urwid.RadioButton(trust_button_group, "Trusted")

        def dismiss_dialog(sender):
            self.update_conversation_list()
            self.dialog_open = False

        def confirmed(sender):
            try:
                existing_conversations = nomadnet.Conversation.conversation_list(self.app)
                
                display_name = e_name.get_edit_text()
                source_hash_text = e_id.get_edit_text()
                source_hash = bytes.fromhex(source_hash_text)
                trust_level = DirectoryEntry.UNTRUSTED
                if r_unknown.state == True:
                    trust_level = DirectoryEntry.UNKNOWN
                elif r_trusted.state == True:
                    trust_level = DirectoryEntry.TRUSTED

                if not source_hash in [c[0] for c in existing_conversations]:
                    entry = DirectoryEntry(source_hash, display_name, trust_level)
                    self.app.directory.remember(entry)

                    new_conversation = nomadnet.Conversation(source_hash_text, nomadnet.NomadNetworkApp.get_shared_instance(), initiator=True)
                    self.update_conversation_list()

                self.display_conversation(source_hash_text)
                self.dialog_open = False

            except Exception as e:
                RNS.log("Could not start conversation. The contained exception was: "+str(e), RNS.LOG_VERBOSE)
                if not dialog_pile.error_display:
                    dialog_pile.error_display = True
                    options = dialog_pile.options(height_type="pack")
                    dialog_pile.contents.append((urwid.Text(""), options))
                    dialog_pile.contents.append((urwid.Text(("error_text", "Could not start conversation. Check your input."), align="center"), options))

        dialog_pile = urwid.Pile([
            e_id,
            e_name,
            urwid.Text(""),
            r_untrusted,
            r_unknown,
            r_trusted,
            urwid.Text(""),
            urwid.Columns([("weight", 0.45, urwid.Button("Create", on_press=confirmed)), ("weight", 0.1, urwid.Text("")), ("weight", 0.45, urwid.Button("Back", on_press=dismiss_dialog))])
        ])
        dialog_pile.error_display = False

        dialog = DialogLineBox(dialog_pile, title="New Conversation")
        dialog.delegate = self
        bottom = self.listbox

        overlay = urwid.Overlay(dialog, bottom, align="center", width=("relative", 100), valign="middle", height="pack", left=2, right=2)

        options = self.columns_widget.options("weight", ConversationsDisplay.list_width)
        self.columns_widget.contents[0] = (overlay, options)

    def delete_conversation(self, source_hash):
        if source_hash in ConversationsDisplay.cached_conversation_widgets:
            conversation = ConversationsDisplay.cached_conversation_widgets[source_hash]
            self.close_conversation(conversation)

    def sync_conversations(self):
        g = self.app.ui.glyphs
        self.dialog_open = True
        
        def dismiss_dialog(sender):
            self.dialog_open = False
            self.sync_dialog = None
            self.update_conversation_list()
            if self.app.message_router.propagation_transfer_state >= LXMF.LXMRouter.PR_COMPLETE:
                self.app.cancel_lxmf_sync()

        max_messages_group = []
        r_mall = urwid.RadioButton(max_messages_group, "Download all", state=True)
        r_mlim = urwid.RadioButton(max_messages_group, "Limit to", state=False)
        ie_lim = urwid.IntEdit("", 5)
        rbs = urwid.GridFlow([r_mlim, ie_lim], 12, 1, 0, align="left")

        def sync_now(sender):
            limit = None
            if r_mlim.get_state():
                limit = ie_lim.value()
            self.app.request_lxmf_sync(limit)
            self.update_sync_dialog()

        def cancel_sync(sender):
            self.app.cancel_lxmf_sync()
            self.update_sync_dialog()

        cancel_button = urwid.Button("Close", on_press=dismiss_dialog)
        sync_progress = SyncProgressBar("progress_empty" , "progress_full", current=self.app.get_sync_progress(), done=1.0, satt=None)

        real_sync_button = urwid.Button("Sync Now", on_press=sync_now)
        hidden_sync_button = urwid.Button("Cancel Sync", on_press=cancel_sync)

        if self.app.get_sync_status() == "Idle" or self.app.message_router.propagation_transfer_state >= LXMF.LXMRouter.PR_COMPLETE:
            sync_button = real_sync_button
        else:
            sync_button = hidden_sync_button

        button_columns = urwid.Columns([("weight", 0.45, sync_button), ("weight", 0.1, urwid.Text("")), ("weight", 0.45, cancel_button)])
        real_sync_button.bc = button_columns

        pn_ident = None
        if self.app.get_default_propagation_node() != None:
            pn_hash = self.app.get_default_propagation_node()
            pn_ident = RNS.Identity.recall(pn_hash)

            if pn_ident == None:
                RNS.log("Propagation node identity is unknown, requesting from network...", RNS.LOG_DEBUG)
                RNS.Transport.request_path(pn_hash)

        if pn_ident != None:
            node_hash = RNS.Destination.hash_from_name_and_identity("nomadnetwork.node", pn_ident)
            pn_entry = self.app.directory.find(node_hash)

            dialog = DialogLineBox(
                urwid.Pile([
                    urwid.Text(""+g["node"]+" "+str(pn_entry.display_name), align="center"),
                    urwid.Divider(g["divider1"]),
                    sync_progress,
                    urwid.Divider(g["divider1"]),
                    r_mall,
                    rbs,
                    urwid.Text(""),
                    button_columns
                ]), title="Message Sync"
            )
        else:
            button_columns = urwid.Columns([("weight", 0.45, urwid.Text("" )), ("weight", 0.1, urwid.Text("")), ("weight", 0.45, cancel_button)])
            dialog = DialogLineBox(
                urwid.Pile([
                    urwid.Text(""),
                    urwid.Text("No trusted nodes found, cannot sync!\n", align="center"),
                    urwid.Text("To syncronise messages from the network, one or more nodes must be marked as trusted in the Known Nodes list. Nomad Network will then automatically sync from the nearest trusted node.", align="left"),
                    urwid.Text(""),
                    button_columns
                ]), title="Message Sync"
            )

        dialog.delegate = self
        dialog.sync_progress = sync_progress
        dialog.cancel_button = cancel_button
        dialog.real_sync_button = real_sync_button
        dialog.hidden_sync_button = hidden_sync_button
        dialog.bc = button_columns

        self.sync_dialog = dialog
        bottom = self.listbox

        overlay = urwid.Overlay(dialog, bottom, align="center", width=("relative", 100), valign="middle", height="pack", left=2, right=2)

        options = self.columns_widget.options("weight", ConversationsDisplay.list_width)
        self.columns_widget.contents[0] = (overlay, options)

    def update_sync_dialog(self, loop = None, sender = None):
        if self.dialog_open and self.sync_dialog != None:
            self.sync_dialog.sync_progress.set_completion(self.app.get_sync_progress())

            if self.app.get_sync_status() == "Idle" or self.app.message_router.propagation_transfer_state >= LXMF.LXMRouter.PR_COMPLETE:
                self.sync_dialog.bc.contents[0] = (self.sync_dialog.real_sync_button, self.sync_dialog.bc.options("weight", 0.45))
            else:
                self.sync_dialog.bc.contents[0] = (self.sync_dialog.hidden_sync_button, self.sync_dialog.bc.options("weight", 0.45))

            self.app.ui.loop.set_alarm_in(0.2, self.update_sync_dialog)


    def conversation_list_selection(self, arg1, arg2):
        pass

    def update_conversation_list(self):
        ilb_position = self.ilb.get_selected_position()
        self.update_listbox()
        options = self.columns_widget.options("weight", ConversationsDisplay.list_width)
        if not (self.dialog_open and self.sync_dialog != None):
            self.columns_widget.contents[0] = (self.listbox, options)
        else:
            bottom = self.listbox
            overlay = urwid.Overlay(self.sync_dialog, bottom, align="center", width=("relative", 100), valign="middle", height="pack", left=2, right=2)
            self.columns_widget.contents[0] = (overlay, options)

        if ilb_position != None:
            self.ilb.select_item(ilb_position)
        nomadnet.NomadNetworkApp.get_shared_instance().ui.loop.draw_screen()

        if self.app.ui.main_display.sub_displays.active_display == self.app.ui.main_display.sub_displays.conversations_display:
            if self.currently_displayed_conversation != None:
                if self.app.conversation_is_unread(self.currently_displayed_conversation):
                    self.app.mark_conversation_read(self.currently_displayed_conversation)
                    try:
                        if os.path.isfile(self.app.conversationpath + "/" + self.currently_displayed_conversation + "/unread"):
                            os.unlink(self.app.conversationpath + "/" + self.currently_displayed_conversation + "/unread")
                    except Exception as e:
                        raise e




    def display_conversation(self, sender=None, source_hash=None):
        if self.currently_displayed_conversation != None:
            if self.app.conversation_is_unread(self.currently_displayed_conversation):
                self.app.mark_conversation_read(self.currently_displayed_conversation)

        self.currently_displayed_conversation = source_hash
        options = self.widget.options("weight", 1-ConversationsDisplay.list_width)
        self.widget.contents[1] = (self.make_conversation_widget(source_hash), options)
        if source_hash == None:
            self.widget.set_focus_column(0)
        else:
            if self.app.conversation_is_unread(source_hash):
                self.app.mark_conversation_read(source_hash)
                self.update_conversation_list()

            self.widget.set_focus_column(1)
            conversation_position = None
            index = 0
            for widget in self.list_widgets:
                if widget.source_hash == source_hash:
                    conversation_position = index
                index += 1

            if conversation_position != None:
                self.ilb.select_item(conversation_position)
        

    def make_conversation_widget(self, source_hash):
        if source_hash in ConversationsDisplay.cached_conversation_widgets:
            conversation_widget = ConversationsDisplay.cached_conversation_widgets[source_hash]
            if source_hash != None:
                conversation_widget.update_message_widgets(replace=True)

            conversation_widget.check_editor_allowed()
            return conversation_widget
        else:
            widget = ConversationWidget(source_hash)
            widget.delegate = self
            ConversationsDisplay.cached_conversation_widgets[source_hash] = widget

            widget.check_editor_allowed()
            return widget

    def close_conversation_by_hash(self, conversation_hash):
        if conversation_hash in ConversationsDisplay.cached_conversation_widgets:
            ConversationsDisplay.cached_conversation_widgets.pop(conversation_hash)

        if self.currently_displayed_conversation == conversation_hash:
            self.display_conversation(sender=None, source_hash=None)

    def close_conversation(self, conversation):
        if conversation.source_hash in ConversationsDisplay.cached_conversation_widgets:
            ConversationsDisplay.cached_conversation_widgets.pop(conversation.source_hash)

        if self.currently_displayed_conversation == conversation.source_hash:
            self.display_conversation(sender=None, source_hash=None)


    def conversation_list_widget(self, conversation):
        trust_level  = conversation[2]
        display_name = conversation[1]
        source_hash  = conversation[0]
        unread       = conversation[4]

        g = self.app.ui.glyphs

        if trust_level == DirectoryEntry.UNTRUSTED:
            symbol        = g["cross"]
            style         = "list_untrusted"
            focus_style   = "list_focus_untrusted"
        elif trust_level == DirectoryEntry.UNKNOWN:
            symbol        = "?"
            style         = "list_unknown"
            focus_style   = "list_focus"
        elif trust_level == DirectoryEntry.TRUSTED:
            symbol        = g["check"]
            style         = "list_trusted"
            focus_style   = "list_focus_trusted"
        elif trust_level == DirectoryEntry.WARNING:
            symbol        = g["warning"]
            style         = "list_warning"
            focus_style   = "list_focus"
        else:
            symbol        = g["warning"]
            style         = "list_untrusted"
            focus_style   = "list_focus_untrusted"

        display_text = symbol

        if display_name != None and display_name != "":
            display_text += " "+display_name

        if trust_level != DirectoryEntry.TRUSTED:
            display_text += " <"+source_hash+">"
        
        if trust_level != DirectoryEntry.UNTRUSTED:
            if unread:
                if source_hash != self.currently_displayed_conversation:
                    display_text += " "+g["unread"]


        widget = ListEntry(display_text)
        urwid.connect_signal(widget, "click", self.display_conversation, conversation[0])
        display_widget = urwid.AttrMap(widget, style, focus_style)
        display_widget.source_hash = source_hash
        display_widget.display_name = display_name

        return display_widget


    def shortcuts(self):
        focus_path = self.widget.get_focus_path()
        if focus_path[0] == 0:
            return self.list_shortcuts
        elif focus_path[0] == 1:
            return self.editor_shortcuts
        else:
            return self.list_shortcuts

class ListEntry(urwid.Text):
    _selectable = True

    signals = ["click"]

    def keypress(self, size, key):
        """
        Send 'click' signal on 'activate' command.
        """
        if self._command_map[key] != urwid.ACTIVATE:
            return key

        self._emit('click')

    def mouse_event(self, size, event, button, x, y, focus):
        """
        Send 'click' signal on button 1 press.
        """
        if button != 1 or not urwid.util.is_mouse_press(event):
            return False

        self._emit('click')
        return True

class MessageEdit(urwid.Edit):
    def keypress(self, size, key):
        if key == "ctrl d":
            self.delegate.send_message()
        elif key == "ctrl k":
            self.delegate.clear_editor()
        elif key == "up":
            y = self.get_cursor_coords(size)[1]
            if y == 0:
                if self.delegate.full_editor_active and self.name == "title_editor":
                    self.delegate.frame.set_focus("body")
                elif not self.delegate.full_editor_active and self.name == "content_editor":
                    self.delegate.frame.set_focus("body")
                else:
                    return super(MessageEdit, self).keypress(size, key)
            else:
                return super(MessageEdit, self).keypress(size, key)
        else:
            return super(MessageEdit, self).keypress(size, key)


class ConversationFrame(urwid.Frame):
    def keypress(self, size, key):
        if self.get_focus() == "body":
            if key == "up" and self.delegate.messagelist.top_is_visible:
                nomadnet.NomadNetworkApp.get_shared_instance().ui.main_display.frame.set_focus("header")
            elif key == "down" and self.delegate.messagelist.bottom_is_visible:
                self.set_focus("footer")
            else:
                return super(ConversationFrame, self).keypress(size, key)
        elif key == "ctrl k":
            self.delegate.clear_editor()
        else:
            return super(ConversationFrame, self).keypress(size, key)

class ConversationWidget(urwid.WidgetWrap):
    def __init__(self, source_hash):
        self.app = nomadnet.NomadNetworkApp.get_shared_instance()
        g = self.app.ui.glyphs
        if source_hash == None:
            self.frame = None
            display_widget = urwid.LineBox(urwid.Filler(urwid.Text("\n  No conversation selected"), "top"))
            urwid.WidgetWrap.__init__(self, display_widget)
        else:
            if source_hash in ConversationsDisplay.cached_conversation_widgets:
                return ConversationsDisplay.cached_conversation_widgets[source_hash]
            else:
                self.source_hash = source_hash
                self.conversation = nomadnet.Conversation(source_hash, nomadnet.NomadNetworkApp.get_shared_instance())
                self.message_widgets = []
                self.sort_by_timestamp = False
                self.updating_message_widgets = False

                self.update_message_widgets()

                self.conversation.register_changed_callback(self.conversation_changed)

                #title_editor  = MessageEdit(caption="\u270E", edit_text="", multiline=False)
                title_editor  = MessageEdit(caption="", edit_text="", multiline=False)
                title_editor.delegate = self
                title_editor.name = "title_editor"

                #msg_editor  = MessageEdit(caption="\u270E", edit_text="", multiline=True)
                msg_editor  = MessageEdit(caption="", edit_text="", multiline=True)
                msg_editor.delegate = self
                msg_editor.name = "content_editor"

                header = None
                if self.conversation.trust_level == DirectoryEntry.UNTRUSTED:
                    header = urwid.AttrMap(urwid.Padding(urwid.Text(g["warning"]+" Warning: Conversation with untrusted peer "+g["warning"], align="center")), "msg_warning_untrusted")

                self.minimal_editor = urwid.AttrMap(msg_editor, "msg_editor")
                self.minimal_editor.name = "minimal_editor"

                title_columns = urwid.Columns([
                    (8, urwid.Text("Title")),
                    urwid.AttrMap(title_editor, "msg_editor"),
                ])

                content_columns = urwid.Columns([
                    (8, urwid.Text("Content")),
                    urwid.AttrMap(msg_editor, "msg_editor")
                ])

                self.full_editor = urwid.Pile([
                    title_columns,
                    content_columns
                ])
                self.full_editor.name = "full_editor"

                self.content_editor = msg_editor
                self.title_editor = title_editor
                self.full_editor_active = False

                self.frame = ConversationFrame(
                    self.messagelist,
                    header=header,
                    footer=self.minimal_editor,
                    focus_part="footer"
                )
                self.frame.delegate = self

                self.display_widget = urwid.LineBox(
                    self.frame
                )
                
                urwid.WidgetWrap.__init__(self, self.display_widget)

    def clear_history_dialog(self):
        def dismiss_dialog(sender):
            self.dialog_open = False
            self.conversation_changed(None)

        def confirmed(sender):
            self.dialog_open = False
            self.conversation.clear_history()
            self.conversation_changed(None)


        dialog = DialogLineBox(
            urwid.Pile([
                urwid.Text("Clear conversation history\n", align="center"),
                urwid.Columns([("weight", 0.45, urwid.Button("Yes", on_press=confirmed)), ("weight", 0.1, urwid.Text("")), ("weight", 0.45, urwid.Button("No", on_press=dismiss_dialog))])
            ]), title="?"
        )
        dialog.delegate = self
        bottom = self.messagelist

        overlay = urwid.Overlay(dialog, bottom, align="center", width=34, valign="middle", height="pack", left=2, right=2)

        self.frame.contents["body"] = (overlay, self.frame.options())
        self.frame.set_focus("body")
    
    def toggle_editor(self):
        if self.full_editor_active:
            self.frame.contents["footer"] = (self.minimal_editor, None)
            self.full_editor_active = False
        else:
            self.frame.contents["footer"] = (self.full_editor, None)
            self.full_editor_active = True

    def check_editor_allowed(self):
        g = self.app.ui.glyphs
        if self.frame:
            allowed = nomadnet.NomadNetworkApp.get_shared_instance().directory.is_known(bytes.fromhex(self.source_hash))
            if allowed:
                self.frame.contents["footer"] = (self.minimal_editor, None)
            else:
                warning = urwid.AttrMap(urwid.Padding(urwid.Text(g["info"]+" You cannot currently communicate with this peer, since it's identity keys are not known", align="center")), "msg_header_caution")
                self.frame.contents["footer"] = (warning, None)

    def toggle_focus_area(self):
        name = ""
        try:
            name = self.frame.get_focus_widgets()[0].name
        except Exception as e:
            pass

        if name == "messagelist":
            self.frame.set_focus("footer")
        elif name == "minimal_editor" or name == "full_editor":
            self.frame.set_focus("body")

    def keypress(self, size, key):
        if key == "tab":
            self.toggle_focus_area()
        elif key == "ctrl w":
            self.close()
        elif key == "ctrl p":
            self.conversation.purge_failed()
            self.conversation_changed(None)
        elif key == "ctrl t":
            self.toggle_editor()
        elif key == "ctrl x":
            self.clear_history_dialog()
        elif key == "ctrl o":
            self.sort_by_timestamp ^= True
            self.conversation_changed(None)
        else:
            return super(ConversationWidget, self).keypress(size, key)

    def conversation_changed(self, conversation):
        self.update_message_widgets(replace = True)

    def update_message_widgets(self, replace = False):
        while self.updating_message_widgets:
            time.sleep(0.5)

        self.updating_message_widgets = True
        self.message_widgets = []
        added_hashes = []
        for message in self.conversation.messages:
            message_hash = message.get_hash()
            if not message_hash in added_hashes:
                added_hashes.append(message_hash)
                message_widget = LXMessageWidget(message)
                self.message_widgets.append(message_widget)
        
        if self.sort_by_timestamp:
            self.message_widgets.sort(key=lambda m: m.timestamp, reverse=False)
        else:
            self.message_widgets.sort(key=lambda m: m.sort_timestamp, reverse=False)

        from nomadnet.vendor.additional_urwid_widgets import IndicativeListBox
        self.messagelist = IndicativeListBox(self.message_widgets, position = len(self.message_widgets)-1)
        self.messagelist.name = "messagelist"
        if replace:
            self.frame.contents["body"] = (self.messagelist, None)
            nomadnet.NomadNetworkApp.get_shared_instance().ui.loop.draw_screen()

        self.updating_message_widgets = False


    def clear_editor(self):
        self.content_editor.set_edit_text("")
        self.title_editor.set_edit_text("")

    def send_message(self):
        content = self.content_editor.get_edit_text()
        title = self.title_editor.get_edit_text()
        if not content == "":
            if self.conversation.send(content, title):
                self.clear_editor()
            else:
                pass

    def close(self):
        self.delegate.close_conversation(self)


class LXMessageWidget(urwid.WidgetWrap):
    def __init__(self, message):
        app = nomadnet.NomadNetworkApp.get_shared_instance()
        g = app.ui.glyphs
        self.timestamp = message.get_timestamp()
        self.sort_timestamp = message.sort_timestamp
        time_format = app.time_format
        message_time = datetime.fromtimestamp(self.timestamp)
        encryption_string = ""
        if message.get_transport_encrypted():
            encryption_string = " ["+g["encrypted"]+" "+str(message.get_transport_encryption())+"]"
        else:
            encryption_string = " ["+g["plaintext"]+" "+str(message.get_transport_encryption())+"]"
        
        title_string = message_time.strftime(time_format)+encryption_string

        if app.lxmf_destination.hash == message.lxm.source_hash:
            if message.lxm.state == LXMF.LXMessage.DELIVERED:
                header_style = "msg_header_delivered"
                title_string = g["check"]+" "+title_string
            elif message.lxm.state == LXMF.LXMessage.FAILED:
                header_style = "msg_header_failed"
                title_string = g["cross"]+" "+title_string
            elif message.lxm.method == LXMF.LXMessage.PROPAGATED and message.lxm.state == LXMF.LXMessage.SENT:
                header_style = "msg_header_propagated"
                title_string = g["sent"]+" "+title_string
            elif message.lxm.state == LXMF.LXMessage.SENT:
                header_style = "msg_header_sent"
                title_string = g["sent"]+" "+title_string
            else:
                header_style = "msg_header_sent"
                title_string = g["arrow_r"]+" "+title_string
        else:
            if message.signature_validated():
                header_style = "msg_header_ok"
                title_string = g["check"]+" "+title_string
            else:
                header_style = "msg_header_caution"
                title_string = g["warning"]+" "+message.get_signature_description() + "\n  " + title_string

        if message.get_title() != "":
            title_string += " | " + message.get_title()

        title = urwid.AttrMap(urwid.Text(title_string), header_style)

        display_widget = urwid.Pile([
            title,
            urwid.Text(message.get_content()),
            urwid.Text("")
        ])

        urwid.WidgetWrap.__init__(self, display_widget)

class SyncProgressBar(urwid.ProgressBar):
    def get_text(self):
        status = nomadnet.NomadNetworkApp.get_shared_instance().get_sync_status()
        show_percent = nomadnet.NomadNetworkApp.get_shared_instance().sync_status_show_percent()
        if show_percent:
            return status+" "+super().get_text()
        else:
            return status