import logging

from typing import Self, TYPE_CHECKING

from dzgui.const.constants import APP_NAME
from dzgui.const.enum import ContextMenuGroup, ServerTab
from dzgui.views.trees.tree_servers import ServerTreeView
from dzgui.util.strings import server_labels

import gi

gi.require_version("Gtk", "3.0")
from gi.repository import Gtk, Gdk

logger = logging.getLogger(APP_NAME)

if TYPE_CHECKING:
    from dzgui.controllers.mc import Controller
    from dzgui.controllers.emitter import Emitter


class ScrollableTree(Gtk.ScrolledWindow):
    def __init__(self, tree: "ServerTreeView") -> None:
        super().__init__(overlay_scrolling=False)

        self.tree = tree
        self.add(tree)

    def get_tree(self) -> "ServerTreeView":
        return self.tree


class ServerNotebook(Gtk.ScrolledWindow):
    def __init__(self, controller: "Controller"):
        super().__init__()

        self.controller = controller
        self.emitter = self.controller.get_emitter()

        self.controller.register_widget("servers", self)
        self.notebook = Gtk.Notebook(show_tabs=True)

        self.browser = ServerTreeView(
            controller, ServerTab.BROWSER, ContextMenuGroup.SERVER_BROWSER
        )
        self.saved = ServerTreeView(controller, ServerTab.SAVED, ContextMenuGroup.SAVED)
        self.recent = ServerTreeView(
            controller, ServerTab.RECENT, ContextMenuGroup.RECENT
        )
        self.lan = ServerTreeView(
            controller,
            ServerTab.LAN,
            ContextMenuGroup.SCAN_LAN,
            show_empty=True,
            show_full=True,
        )

        tabs = [
            (self.browser, server_labels.browser),
            (self.saved, server_labels.saved),
            (self.recent, server_labels.recent),
            (self.lan, server_labels.lan),
        ]

        for tree, label in tabs:
            scrolled = ScrollableTree(tree)
            self.notebook.append_page(scrolled, Gtk.Label(label=label))

        self.add(self.notebook)
        self.notebook.connect_after("switch-page", self._on_page_changed)
        self.connect("key-press-event", self._on_keypress)
        self.connect("map", self._on_map)
        self.connect("unmap", self._on_unmap)

        self.emitter.connect("servers_loaded", self._on_servers_loaded)
        self.emitter.connect("saved_servers_changed", self._on_saved_servers_changed)

    def _on_saved_servers_changed(self, emitter: "Emitter") -> None:
        # TODO: can be dropped/consolidated?
        saved = 1
        cur_page = self.notebook.get_current_page()
        if cur_page == saved:
            return
        page = self.notebook.get_nth_page(saved)
        if not page:
            return
        label = self.notebook.get_tab_label(page)
        if label is None:
            return
        if hasattr(label, "set_text"):
            label.set_text(f"{server_labels.saved}*")

    def _on_servers_loaded(self, emitter: "Emitter", tab: "ServerTab") -> None:
        # NOTE: workaround for GTK bug where fullscreen causes headers to vanish when model is None
        # TODO: this should be internal to servers page
        tv = self.get_active_treeview()
        if tv is None:
            return
        state = False if tv.get_model() is None else True
        tv.set_headers_visible(state)
        tv.set_loaded(True)
        tv.focus_first_row()
        tv.grab_focus()

    def _on_map(self, widget: Self) -> None:
        self.emitter.emit("server_page_toggled", True)

    def _on_unmap(self, widget: Self) -> None:
        self.emitter.emit("server_page_toggled", False)

    def _on_keypress(self, widget: Self, event: Gdk.EventKey) -> bool:
        # NOTE: abort if modifier mask is active
        if event.state != 0:
            return False
        match event.keyval:
            case Gdk.KEY_n:
                self.notebook.next_page()
                self.grab_content_area()
                return True
            case Gdk.KEY_p:
                self.notebook.prev_page()
                self.grab_content_area()
                return True
            case _:
                return False

    def grab_content_area(self) -> None:
        tv = self.get_active_treeview()
        if tv is not None:
            tv.grab_focus()

    def get_current_tab_text(self) -> str:
        ind = self.notebook.get_current_page()
        child = self.notebook.get_nth_page(ind)
        if child is None:
            return ""
        text = self.notebook.get_tab_label_text(child)
        if text is None:
            return ""
        return text

    def _on_page_changed(
        self, notebook: Gtk.Notebook, child: ScrollableTree, index: int
    ) -> None:
        if self.controller.loaded is False:
            return

        label = self.notebook.get_tab_label_text(child)
        if label is not None:
            # TODO: strings
            text = label.strip("*")
            self.notebook.set_tab_label_text(child, text)

        tree = child.get_tree()
        self.emitter.emit("server_page_changed", tree)

        # NOTE: spawns a thread
        tv = self.get_active_treeview()
        if tv is not None:
            self.controller.populate_model(tv)

    def get_active_treeview(self) -> ServerTreeView:
        index = self.notebook.get_current_page()
        scrollable = self.notebook.get_nth_page(index)
        if scrollable is not None and hasattr(scrollable, "get_children"):
            tv = scrollable.get_children()[0]
            if isinstance(tv, ServerTreeView):
                return tv
        raise ValueError("No treeview set")

    def update_tab_widths(self, col: Gtk.TreeViewColumn) -> None:
        # TODO: may cause pixel offsets when application is maximized
        width = col.get_width()
        title = col.get_title()
        for tab in (self.browser, self.saved, self.recent, self.lan):
            if tab == self.get_active_treeview():
                continue
            for col in tab.get_columns():
                if col.get_title() == title:
                    self.controller.suppress_signal(
                        tab, col, "_on_col_width_changed", True
                    )
                    col.set_fixed_width(width)
                    self.controller.suppress_signal(
                        tab, col, "_on_col_width_changed", False
                    )

    def get_browser(self) -> ServerTreeView:
        return self.browser

    def get_saved(self) -> ServerTreeView:
        return self.saved

    def get_recent(self) -> ServerTreeView:
        return self.recent

    def get_lan(self) -> ServerTreeView:
        return self.lan