# -*- coding: utf-8 -*-
# Copyright: Ankitects Pty Ltd and contributors
# License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html

from __future__ import annotations

from concurrent.futures import Future
from enum import Enum
from typing import (
    TYPE_CHECKING,
    Any,
    Dict,
    Iterable,
    List,
    Optional,
    Sequence,
    Tuple,
    cast,
)

import aqt
from anki.collection import ConfigBoolKey, SearchTerm
from anki.decks import DeckTreeNode
from anki.errors import DeckRenameError, InvalidInput
from anki.tags import TagTreeNode
from aqt import gui_hooks
from aqt.main import ResetReason
from aqt.models import Models
from aqt.qt import *
from aqt.theme import theme_manager
from aqt.utils import (
    TR,
    askUser,
    getOnlyText,
    show_invalid_search_error,
    showInfo,
    showWarning,
    tr,
)

if TYPE_CHECKING:
    from anki.collection import ConfigBoolKeyValue, TRValue


class SidebarItemType(Enum):
    ROOT = 0
    COLLECTION = 1
    CURRENT_DECK = 2
    SAVED_SEARCH = 3
    FILTER = 3  # legacy alias for SAVED_SEARCH
    DECK = 4
    NOTETYPE = 5
    TAG = 6
    CUSTOM = 7
    TEMPLATE = 8
    SAVED_SEARCH_ROOT = 9
    DECK_ROOT = 10
    NOTETYPE_ROOT = 11
    TAG_ROOT = 12


#  used by an add-on hook
class SidebarStage(Enum):
    ROOT = 0
    STANDARD = 1
    FAVORITES = 2
    DECKS = 3
    MODELS = 4
    TAGS = 5


class SidebarItem:
    def __init__(
        self,
        name: str,
        icon: str,
        onClick: Callable[[], None] = None,
        onExpanded: Callable[[bool], None] = None,
        expanded: bool = False,
        item_type: SidebarItemType = SidebarItemType.CUSTOM,
        id: int = 0,
        full_name: str = None,
    ) -> None:
        self.name = name
        if not full_name:
            full_name = name
        self.full_name = full_name
        self.icon = icon
        self.item_type = item_type
        self.id = id
        self.onClick = onClick
        self.onExpanded = onExpanded
        self.expanded = expanded
        self.children: List["SidebarItem"] = []
        self.parentItem: Optional["SidebarItem"] = None
        self.tooltip: Optional[str] = None
        self.row_in_parent: Optional[int] = None
        self._search_matches_self = False
        self._search_matches_child = False

    def addChild(self, cb: "SidebarItem") -> None:
        self.children.append(cb)
        cb.parentItem = self

    def rowForChild(self, child: "SidebarItem") -> Optional[int]:
        try:
            return self.children.index(child)
        except ValueError:
            return None

    def is_expanded(self, searching: bool) -> bool:
        if not searching:
            return self.expanded
        else:
            if self._search_matches_child:
                return True
            # if search matches top level, expand children one level
            return self._search_matches_self and self.item_type in (
                SidebarItemType.SAVED_SEARCH_ROOT,
                SidebarItemType.DECK_ROOT,
                SidebarItemType.NOTETYPE_ROOT,
                SidebarItemType.TAG_ROOT,
            )

    def is_highlighted(self) -> bool:
        return self._search_matches_self

    def search(self, lowered_text: str) -> bool:
        "True if we or child matched."
        self._search_matches_self = lowered_text in self.name.lower()
        self._search_matches_child = any(
            [child.search(lowered_text) for child in self.children]
        )
        return self._search_matches_self or self._search_matches_child


class SidebarModel(QAbstractItemModel):
    def __init__(self, root: SidebarItem) -> None:
        super().__init__()
        self.root = root
        self._cache_rows(root)

    def _cache_rows(self, node: SidebarItem) -> None:
        "Cache index of children in parent."
        for row, item in enumerate(node.children):
            item.row_in_parent = row
            self._cache_rows(item)

    def item_for_index(self, idx: QModelIndex) -> SidebarItem:
        return idx.internalPointer()

    def search(self, text: str) -> bool:
        return self.root.search(text.lower())

    # Qt API
    ######################################################################

    def rowCount(self, parent: QModelIndex = QModelIndex()) -> int:
        if not parent.isValid():
            return len(self.root.children)
        else:
            item: SidebarItem = parent.internalPointer()
            return len(item.children)

    def columnCount(self, parent: QModelIndex = QModelIndex()) -> int:
        return 1

    def index(
        self, row: int, column: int, parent: QModelIndex = QModelIndex()
    ) -> QModelIndex:
        if not self.hasIndex(row, column, parent):
            return QModelIndex()

        parentItem: SidebarItem
        if not parent.isValid():
            parentItem = self.root
        else:
            parentItem = parent.internalPointer()

        item = parentItem.children[row]
        return self.createIndex(row, column, item)

    def parent(self, child: QModelIndex) -> QModelIndex:  # type: ignore
        if not child.isValid():
            return QModelIndex()

        childItem: SidebarItem = child.internalPointer()
        parentItem = childItem.parentItem

        if parentItem is None or parentItem == self.root:
            return QModelIndex()

        row = parentItem.row_in_parent

        return self.createIndex(row, 0, parentItem)

    def data(self, index: QModelIndex, role: int = Qt.DisplayRole) -> QVariant:
        if not index.isValid():
            return QVariant()

        if role not in (Qt.DisplayRole, Qt.DecorationRole, Qt.ToolTipRole):
            return QVariant()

        item: SidebarItem = index.internalPointer()

        if role == Qt.DisplayRole:
            return QVariant(item.name)
        elif role == Qt.ToolTipRole:
            return QVariant(item.tooltip)
        else:
            return QVariant(theme_manager.icon_from_resources(item.icon))

    def supportedDropActions(self) -> Qt.DropActions:
        return cast(Qt.DropActions, Qt.MoveAction)

    def flags(self, index: QModelIndex) -> Qt.ItemFlags:
        if not index.isValid():
            return cast(Qt.ItemFlags, Qt.ItemIsEnabled)
        flags = Qt.ItemIsEnabled | Qt.ItemIsSelectable

        item: SidebarItem = index.internalPointer()
        if item.item_type in (
            SidebarItemType.DECK,
            SidebarItemType.DECK_ROOT,
            SidebarItemType.TAG,
            SidebarItemType.TAG_ROOT,
        ):
            flags |= Qt.ItemIsDragEnabled | Qt.ItemIsDropEnabled

        return cast(Qt.ItemFlags, flags)

    # Helpers
    ######################################################################

    def iconFromRef(self, iconRef: str) -> QIcon:
        print("iconFromRef() deprecated")
        return theme_manager.icon_from_resources(iconRef)


def expand_where_necessary(
    model: SidebarModel,
    tree: QTreeView,
    parent: Optional[QModelIndex] = None,
    searching: bool = False,
) -> None:
    parent = parent or QModelIndex()
    for row in range(model.rowCount(parent)):
        idx = model.index(row, 0, parent)
        if not idx.isValid():
            continue
        expand_where_necessary(model, tree, idx, searching)
        if item := model.item_for_index(idx):
            if item.is_expanded(searching):
                tree.setExpanded(idx, True)


class SidebarSearchBar(QLineEdit):
    def __init__(self, sidebar: SidebarTreeView) -> None:
        QLineEdit.__init__(self, sidebar)
        self.setPlaceholderText(sidebar.col.tr(TR.BROWSING_SIDEBAR_FILTER))
        self.sidebar = sidebar
        self.timer = QTimer(self)
        self.timer.setInterval(600)
        self.timer.setSingleShot(True)
        qconnect(self.timer.timeout, self.onSearch)
        qconnect(self.textChanged, self.onTextChanged)

    def onTextChanged(self, text: str) -> None:
        if not self.timer.isActive():
            self.timer.start()

    def onSearch(self) -> None:
        self.sidebar.search_for(self.text())

    def keyPressEvent(self, evt: QKeyEvent) -> None:
        if evt.key() in (Qt.Key_Up, Qt.Key_Down):
            self.sidebar.setFocus()
        elif evt.key() in (Qt.Key_Enter, Qt.Key_Return):
            self.onSearch()
        else:
            QLineEdit.keyPressEvent(self, evt)


class SidebarTreeView(QTreeView):
    def __init__(self, browser: aqt.browser.Browser) -> None:
        super().__init__()
        self.browser = browser
        self.mw = browser.mw
        self.col = self.mw.col
        self.current_search: Optional[str] = None

        self.setContextMenuPolicy(Qt.CustomContextMenu)
        self.customContextMenuRequested.connect(self.onContextMenu)  # type: ignore
        self.context_menus: Dict[SidebarItemType, Sequence[Tuple[str, Callable]]] = {
            SidebarItemType.DECK: (
                (tr(TR.ACTIONS_RENAME), self.rename_deck),
                (tr(TR.ACTIONS_DELETE), self.delete_deck),
            ),
            SidebarItemType.TAG: (
                (tr(TR.ACTIONS_RENAME), self.rename_tag),
                (tr(TR.ACTIONS_DELETE), self.remove_tag),
            ),
            SidebarItemType.SAVED_SEARCH: (
                (tr(TR.ACTIONS_RENAME), self.rename_saved_search),
                (tr(TR.ACTIONS_DELETE), self.remove_saved_search),
            ),
            SidebarItemType.NOTETYPE: ((tr(TR.ACTIONS_MANAGE), self.manage_notetype),),
            SidebarItemType.SAVED_SEARCH_ROOT: (
                (tr(TR.BROWSING_SIDEBAR_SAVE_CURRENT_SEARCH), self.save_current_search),
            ),
        }

        self.setUniformRowHeights(True)
        self.setHeaderHidden(True)
        self.setIndentation(15)
        self.setAutoExpandDelay(600)
        # this doesn't play nicely with shift+click to OR items - we may want
        # to put it behind a 'multi-select' mode
        # self.setSelectionMode(QAbstractItemView.SelectionMode.ExtendedSelection)

        self.setDragDropMode(QAbstractItemView.InternalMove)
        self.setDragDropOverwriteMode(False)

        qconnect(self.expanded, self.onExpansion)
        qconnect(self.collapsed, self.onCollapse)

        # match window background color
        bgcolor = QPalette().window().color().name()
        self.setStyleSheet("QTreeView { background: '%s'; }" % bgcolor)

    def model(self) -> SidebarModel:
        return super().model()

    def refresh(self) -> None:
        "Refresh list. No-op if sidebar is not visible."
        if not self.isVisible():
            return

        def on_done(fut: Future) -> None:
            root = fut.result()
            model = SidebarModel(root)

            # from PyQt5.QtTest import QAbstractItemModelTester
            # tester = QAbstractItemModelTester(model)

            self.setModel(model)
            if self.current_search:
                self.search_for(self.current_search)
            else:
                expand_where_necessary(model, self)

        self.mw.taskman.run_in_background(self._root_tree, on_done)

    def search_for(self, text: str) -> None:
        self.showColumn(0)
        if not text.strip():
            self.current_search = None
            self.refresh()
            return

        self.current_search = text
        # start from a collapsed state, as it's faster
        self.collapseAll()
        self.setColumnHidden(0, not self.model().search(text))
        expand_where_necessary(self.model(), self, searching=True)

    def drawRow(
        self, painter: QPainter, options: QStyleOptionViewItem, idx: QModelIndex
    ) -> None:
        if self.current_search and (item := self.model().item_for_index(idx)):
            if item.is_highlighted():
                brush = QBrush(theme_manager.qcolor("suspended-bg"))
                painter.save()
                painter.fillRect(options.rect, brush)
                painter.restore()
        return super().drawRow(painter, options, idx)

    def dropEvent(self, event: QDropEvent) -> None:
        model = self.model()
        source_items = [model.item_for_index(idx) for idx in self.selectedIndexes()]
        target_item = model.item_for_index(self.indexAt(event.pos()))
        if self.handle_drag_drop(source_items, target_item):
            event.acceptProposedAction()

    def handle_drag_drop(self, sources: List[SidebarItem], target: SidebarItem) -> bool:
        if target.item_type in (SidebarItemType.DECK, SidebarItemType.DECK_ROOT):
            return self._handle_drag_drop_decks(sources, target)
        if target.item_type in (SidebarItemType.TAG, SidebarItemType.TAG_ROOT):
            return self._handle_drag_drop_tags(sources, target)
        return False

    def _handle_drag_drop_decks(
        self, sources: List[SidebarItem], target: SidebarItem
    ) -> bool:
        source_ids = [
            source.id for source in sources if source.item_type == SidebarItemType.DECK
        ]
        if not source_ids:
            return False

        def on_done(fut: Future) -> None:
            fut.result()
            self.refresh()

        self.mw.taskman.with_progress(
            lambda: self.col.decks.drag_drop_decks(source_ids, target.id), on_done
        )
        return True

    def _handle_drag_drop_tags(
        self, sources: List[SidebarItem], target: SidebarItem
    ) -> bool:
        source_ids = [
            source.full_name
            for source in sources
            if source.item_type == SidebarItemType.TAG
        ]
        if not source_ids:
            return False

        def on_done(fut: Future) -> None:
            fut.result()
            self.refresh()

        if target.item_type == SidebarItemType.TAG_ROOT:
            target_name = ""
        else:
            target_name = target.full_name

        self.mw.taskman.with_progress(
            lambda: self.col.tags.drag_drop(source_ids, target_name), on_done
        )
        return True

    def onClickCurrent(self) -> None:
        idx = self.currentIndex()
        if item := self.model().item_for_index(idx):
            if item.onClick:
                item.onClick()

    def mouseReleaseEvent(self, event: QMouseEvent) -> None:
        super().mouseReleaseEvent(event)
        if event.button() == Qt.LeftButton:
            self.onClickCurrent()

    def keyPressEvent(self, event: QKeyEvent) -> None:
        if event.key() in (Qt.Key_Return, Qt.Key_Enter):
            self.onClickCurrent()
        else:
            super().keyPressEvent(event)

    def onExpansion(self, idx: QModelIndex) -> None:
        if self.current_search:
            return
        self._onExpansionChange(idx, True)

    def onCollapse(self, idx: QModelIndex) -> None:
        if self.current_search:
            return
        self._onExpansionChange(idx, False)

    def _onExpansionChange(self, idx: QModelIndex, expanded: bool) -> None:
        item = self.model().item_for_index(idx)
        if item and item.expanded != expanded:
            item.expanded = expanded
            if item.onExpanded:
                item.onExpanded(expanded)

    # Tree building
    ###########################

    def _root_tree(self) -> SidebarItem:
        root = SidebarItem("", "", item_type=SidebarItemType.ROOT)

        handled = gui_hooks.browser_will_build_tree(
            False, root, SidebarStage.ROOT, self
        )
        if handled:
            return root

        for stage, builder in zip(
            list(SidebarStage)[1:],
            (
                self._commonly_used_tree,
                self._saved_searches_tree,
                self._deck_tree,
                self._notetype_tree,
                self._tag_tree,
            ),
        ):
            handled = gui_hooks.browser_will_build_tree(False, root, stage, self)
            if not handled and builder:
                builder(root)

        return root

    def _section_root(
        self,
        *,
        root: SidebarItem,
        name: TRValue,
        icon: str,
        collapse_key: ConfigBoolKeyValue,
        type: Optional[SidebarItemType] = None,
    ) -> SidebarItem:
        def update(expanded: bool) -> None:
            self.col.set_config_bool(collapse_key, not expanded)

        top = SidebarItem(
            tr(name),
            icon,
            onExpanded=update,
            expanded=not self.col.get_config_bool(collapse_key),
            item_type=type,
        )
        root.addChild(top)

        return top

    def _commonly_used_tree(self, root: SidebarItem) -> None:
        item = SidebarItem(
            tr(TR.BROWSING_WHOLE_COLLECTION),
            ":/icons/collection.svg",
            self._filter_func(),
            item_type=SidebarItemType.COLLECTION,
        )
        root.addChild(item)
        item = SidebarItem(
            tr(TR.BROWSING_CURRENT_DECK),
            ":/icons/deck.svg",
            self._filter_func(SearchTerm(deck="current")),
            item_type=SidebarItemType.CURRENT_DECK,
        )
        root.addChild(item)

    def _saved_searches_tree(self, root: SidebarItem) -> None:
        icon = ":/icons/heart.svg"
        saved = self.col.get_config("savedFilters", {})

        root = self._section_root(
            root=root,
            name=TR.BROWSING_SIDEBAR_SAVED_SEARCHES,
            icon=icon,
            collapse_key=ConfigBoolKey.COLLAPSE_FAVORITES,
            type=SidebarItemType.SAVED_SEARCH_ROOT,
        )

        def on_click() -> None:
            self.show_context_menu(root, None)

        root.onClick = on_click

        for name, filt in sorted(saved.items()):
            item = SidebarItem(
                name,
                icon,
                self._filter_func(filt),
                item_type=SidebarItemType.FILTER,
            )
            root.addChild(item)

    def _tag_tree(self, root: SidebarItem) -> None:
        icon = ":/icons/tag.svg"

        def render(
            root: SidebarItem, nodes: Iterable[TagTreeNode], head: str = ""
        ) -> None:
            for node in nodes:

                def toggle_expand() -> Callable[[bool], None]:
                    full_name = head + node.name  # pylint: disable=cell-var-from-loop
                    return lambda expanded: self.mw.col.tags.set_expanded(
                        full_name, expanded
                    )

                item = SidebarItem(
                    node.name,
                    icon,
                    self._filter_func(SearchTerm(tag=head + node.name)),
                    toggle_expand(),
                    node.expanded,
                    item_type=SidebarItemType.TAG,
                    full_name=head + node.name,
                )
                root.addChild(item)
                newhead = head + node.name + "::"
                render(item, node.children, newhead)

        tree = self.col.tags.tree()
        root = self._section_root(
            root=root,
            name=TR.BROWSING_SIDEBAR_TAGS,
            icon=icon,
            collapse_key=ConfigBoolKey.COLLAPSE_TAGS,
            type=SidebarItemType.TAG_ROOT,
        )
        render(root, tree.children)

    def _deck_tree(self, root: SidebarItem) -> None:
        icon = ":/icons/deck.svg"

        def render(
            root: SidebarItem, nodes: Iterable[DeckTreeNode], head: str = ""
        ) -> None:
            for node in nodes:

                def toggle_expand() -> Callable[[bool], None]:
                    did = node.deck_id  # pylint: disable=cell-var-from-loop
                    return lambda _: self.mw.col.decks.collapseBrowser(did)

                item = SidebarItem(
                    node.name,
                    icon,
                    self._filter_func(SearchTerm(deck=head + node.name)),
                    toggle_expand(),
                    not node.collapsed,
                    item_type=SidebarItemType.DECK,
                    id=node.deck_id,
                    full_name=head + node.name,
                )
                root.addChild(item)
                newhead = head + node.name + "::"
                render(item, node.children, newhead)

        tree = self.col.decks.deck_tree()
        root = self._section_root(
            root=root,
            name=TR.BROWSING_SIDEBAR_DECKS,
            icon=icon,
            collapse_key=ConfigBoolKey.COLLAPSE_DECKS,
            type=SidebarItemType.DECK_ROOT,
        )
        render(root, tree.children)

    def _notetype_tree(self, root: SidebarItem) -> None:
        icon = ":/icons/notetype.svg"
        root = self._section_root(
            root=root,
            name=TR.BROWSING_SIDEBAR_NOTETYPES,
            icon=icon,
            collapse_key=ConfigBoolKey.COLLAPSE_NOTETYPES,
            type=SidebarItemType.NOTETYPE_ROOT,
        )

        for nt in sorted(self.col.models.all(), key=lambda nt: nt["name"].lower()):
            item = SidebarItem(
                nt["name"],
                icon,
                self._filter_func(SearchTerm(note=nt["name"])),
                item_type=SidebarItemType.NOTETYPE,
                id=nt["id"],
            )

            for c, tmpl in enumerate(nt["tmpls"]):
                child = SidebarItem(
                    tmpl["name"],
                    icon,
                    self._filter_func(
                        SearchTerm(note=nt["name"]), SearchTerm(template=c)
                    ),
                    item_type=SidebarItemType.TEMPLATE,
                    full_name=nt["name"] + "::" + tmpl["name"],
                )
                item.addChild(child)

            root.addChild(item)

    def _filter_func(self, *terms: Union[str, SearchTerm]) -> Callable:
        return lambda: self.browser.update_search(self.col.build_search_string(*terms))

    # Context menu actions
    ###########################

    def onContextMenu(self, point: QPoint) -> None:
        idx: QModelIndex = self.indexAt(point)
        item = self.model().item_for_index(idx)
        if not item:
            return
        self.show_context_menu(item, idx)

    def show_context_menu(self, item: SidebarItem, idx: Optional[QModelIndex]) -> None:
        m = QMenu()

        if item.item_type in self.context_menus:
            for action in self.context_menus[item.item_type]:
                act_name = action[0]
                act_func = action[1]
                a = m.addAction(act_name)
                qconnect(a.triggered, lambda _, func=act_func: func(item))

        if idx:
            self.maybe_add_tree_actions(m, item, idx)

        if not m.children():
            return

        # until we support multiple selection, show user that only the current
        # item is being operated on by clearing the selection
        if idx:
            sm = self.selectionModel()
            sm.clear()
            sm.select(
                idx,
                cast(
                    QItemSelectionModel.SelectionFlag,
                    QItemSelectionModel.SelectCurrent | QItemSelectionModel.Rows,
                ),
            )

        m.exec_(QCursor.pos())

    def maybe_add_tree_actions(
        self, menu: QMenu, item: SidebarItem, parent: QModelIndex
    ) -> None:
        if self.current_search:
            return
        if not any(bool(c.children) for c in item.children):
            return

        def set_children_collapsed(collapsed: bool) -> None:
            m = self.model()
            self.setExpanded(parent, True)
            for row in range(m.rowCount(parent)):
                idx = m.index(row, 0, parent)
                self.setExpanded(idx, not collapsed)

        menu.addSeparator()
        menu.addAction(
            tr(TR.BROWSING_SIDEBAR_EXPAND_CHILDREN),
            lambda: set_children_collapsed(False),
        )
        menu.addAction(
            tr(TR.BROWSING_SIDEBAR_COLLAPSE_CHILDREN),
            lambda: set_children_collapsed(True),
        )

    def rename_deck(self, item: "aqt.browser.SidebarItem") -> None:
        deck = self.mw.col.decks.get(item.id)
        old_name = deck["name"]
        new_name = getOnlyText(tr(TR.DECKS_NEW_DECK_NAME), default=old_name)
        new_name = new_name.replace('"', "")
        if not new_name or new_name == old_name:
            return
        self.mw.checkpoint(tr(TR.ACTIONS_RENAME_DECK))
        try:
            self.mw.col.decks.rename(deck, new_name)
        except DeckRenameError as e:
            showWarning(e.description)
            return
        self.refresh()
        self.mw.deckBrowser.refresh()

    def remove_tag(self, item: "aqt.browser.SidebarItem") -> None:
        self.browser.editor.saveNow(lambda: self._remove_tag(item))

    def _remove_tag(self, item: "aqt.browser.SidebarItem") -> None:
        old_name = item.full_name

        def do_remove() -> None:
            self.mw.col.tags.remove(old_name)
            self.col.tags.rename(old_name, "")

        def on_done(fut: Future) -> None:
            self.mw.requireReset(reason=ResetReason.BrowserRemoveTags, context=self)
            self.browser.model.endReset()
            fut.result()
            self.refresh()

        self.mw.checkpoint(tr(TR.ACTIONS_REMOVE_TAG))
        self.browser.model.beginReset()
        self.mw.taskman.run_in_background(do_remove, on_done)

    def rename_tag(self, item: "aqt.browser.SidebarItem") -> None:
        self.browser.editor.saveNow(lambda: self._rename_tag(item))

    def _rename_tag(self, item: "aqt.browser.SidebarItem") -> None:
        old_name = item.full_name
        new_name = getOnlyText(tr(TR.ACTIONS_NEW_NAME), default=old_name)
        if new_name == old_name or not new_name:
            return

        def do_rename() -> int:
            self.mw.col.tags.remove(old_name)
            return self.col.tags.rename(old_name, new_name)

        def on_done(fut: Future) -> None:
            self.mw.requireReset(reason=ResetReason.BrowserAddTags, context=self)
            self.browser.model.endReset()

            count = fut.result()
            if not count:
                showInfo(tr(TR.BROWSING_TAG_RENAME_WARNING_EMPTY))
                return

            self.refresh()

        self.mw.checkpoint(tr(TR.ACTIONS_RENAME_TAG))
        self.browser.model.beginReset()
        self.mw.taskman.run_in_background(do_rename, on_done)

    def delete_deck(self, item: "aqt.browser.SidebarItem") -> None:
        self.browser.editor.saveNow(lambda: self._delete_deck(item))

    def _delete_deck(self, item: "aqt.browser.SidebarItem") -> None:
        did = item.id
        if self.mw.deckBrowser.ask_delete_deck(did):

            def do_delete() -> None:
                return self.mw.col.decks.rem(did, True)

            def on_done(fut: Future) -> None:
                self.mw.requireReset(reason=ResetReason.BrowserDeleteDeck, context=self)
                self.browser.search()
                self.browser.model.endReset()
                self.refresh()
                res = fut.result()  # Required to check for errors

            self.mw.checkpoint(tr(TR.DECKS_DELETE_DECK))
            self.browser.model.beginReset()
            self.mw.taskman.run_in_background(do_delete, on_done)

    def remove_saved_search(self, item: "aqt.browser.SidebarItem") -> None:
        name = item.name
        if not askUser(tr(TR.BROWSING_REMOVE_FROM_YOUR_SAVED_SEARCHES, val=name)):
            return
        conf = self.col.get_config("savedFilters")
        del conf[name]
        self.col.set_config("savedFilters", conf)
        self.refresh()

    def rename_saved_search(self, item: "aqt.browser.SidebarItem") -> None:
        old = item.name
        conf = self.col.get_config("savedFilters")
        try:
            filt = conf[old]
        except KeyError:
            return
        new = getOnlyText(tr(TR.ACTIONS_NEW_NAME), default=old)
        if new == old or not new:
            return
        conf[new] = filt
        del conf[old]
        self.col.set_config("savedFilters", conf)
        self.refresh()

    def save_current_search(self, _item: Any = None) -> None:
        try:
            filt = self.col.build_search_string(
                self.browser.form.searchEdit.lineEdit().text()
            )
        except InvalidInput as e:
            show_invalid_search_error(e)
        else:
            name = getOnlyText(tr(TR.BROWSING_PLEASE_GIVE_YOUR_FILTER_A_NAME))
            if not name:
                return
            conf = self.col.get_config("savedFilters")
            conf[name] = filt
            self.col.set_config("savedFilters", conf)
            self.refresh()

    def manage_notetype(self, item: "aqt.browser.SidebarItem") -> None:
        Models(
            self.mw, parent=self.browser, fromMain=True, selected_notetype_id=item.id
        )