#!/usr/bin/python
import pathlib
from . import common
from gi.repository import GObject
from gi.repository import Gtk
from gi.repository import Gio


class Path(GObject.GObject):
    def __init__(self, path):
        GObject.GObject.__init__(self)
        self.path = path

    def __lt__(self, rhs): return self.path < rhs.path
    def get_is_test_result(self):
        return False not in [ f.is_file() for f in self.path.iterdir() ]
    def get_name(self): return self.path.name
    def get_model(self):
        if not self.get_is_test_result():
            return DirectoryModel(self.path)


class DirectoryModel(GObject.GObject, Gio.ListModel):
    def __init__(self, path=None):
        GObject.GObject.__init__(self)
        self.children = [ ]
        self.set_path(path)

    def do_get_item_type(self): return GObject.TYPE_PYOBJECT
    def do_get_n_items(self): return len(self.children)
    def do_get_item(self, n): return self.children[n]

    def set_path(self, path):
        rm = len(self.children)
        self.children.clear()
        self.path = path if path and path.is_dir() else None
        if self.path:
            self.children = sorted([ Path(c) for c in path.iterdir() ])
        self.emit("items-changed", 0, rm, len(self.children))


class DirectoryWindow(Gtk.ScrolledWindow):
    def __init__(self, path=None, autoexpand=True):
        Gtk.ScrolledWindow.__init__(self, vexpand=True,
                                    hscrollbar_policy=Gtk.PolicyType.NEVER)
        self.dirtree = Gtk.TreeListModel.new(root=DirectoryModel(path),
                                             passthrough=False,
                                             autoexpand=autoexpand,
                                             create_func=self.create_func)
        self.selection = Gtk.SingleSelection.new(self.dirtree)
        self.selection.set_autoselect(False)
        self.selection.set_can_unselect(True)
        self.selection.connect("selection-changed", self.selection_changed)

        self.factory   = Gtk.SignalListItemFactory()
        self.factory.connect("setup", self.on_setup)
        self.factory.connect("bind", self.on_bind)
        self.factory.connect("unbind", self.on_unbind)
        self.factory.connect("teardown", self.on_teardown)

        self.listview = Gtk.ListView.new(self.selection, self.factory)
        self.set_child(self.listview)

    def create_func(self, path):
        return path.get_model()

    def on_setup(self, factory, listitem):
        listitem.set_child(Gtk.TreeExpander(child=Gtk.Label(xalign=0)))

    def on_bind(self, factory, listitem):
        treerow  = listitem.get_item()
        filepath = treerow.get_item()
        expander = listitem.get_child()
        expander.set_list_row(treerow)
        expander.get_child().set_text(filepath.get_name())
        listitem.set_selectable(filepath.get_is_test_result())

    def on_unbind(self, factory, listitem):
        expander = listitem.get_child()
        expander.set_list_row(None)
        expander.get_child().set_text("")

    def on_teardown(self, factory, treeitem):
        treeitem.set_child(None)

    def set_directory(self, path):
        self.dirtree.get_model().set_path(path)

    def selection_changed(self, selection, position, n_items):
        treeitem = self.selection.get_selected_item()
        self.emit("test-selected", treeitem.get_item() if treeitem else None)

    def select_none(self):
        self.selection.unselect_item(self.selection.get_selected())

    @GObject.Signal(arg_types=(Path,))
    def test_selected(self, filepath): pass


class Calendar(Gtk.Calendar):
    def __init__(self):
        Gtk.Calendar.__init__(self, show_day_names=True)
        self.connect("next-month", self.view_changed)
        self.connect("next-year",  self.view_changed)
        self.connect("prev-month", self.view_changed)
        self.connect("prev-year",  self.view_changed)
        common.SizeGroup.add_widget(self)
        self.view_changed(self)

    def get_month_directory(self):
        date = self.get_date()
        month = common.XFSTESTS_DATE / f"{date.get_year():04}" / f"{date.get_month():02}"
        return month if month.is_dir() else None

    def get_selected_day(self):
        if month := self.get_month_directory():
            day = month / f"{self.get_date().get_day_of_month():02}"
            return day if day.is_dir() else None

    def view_changed(self, calendar):
        self.clear_marks()
        if month := self.get_month_directory():
            for day in month.iterdir():
                self.mark_day(int(day.stem))
        self.emit("day-selected")


class DatePage(Gtk.Box):
    def __init__(self):
        Gtk.Box.__init__(self, orientation=Gtk.Orientation.VERTICAL, spacing=5)
        self.calendar = Calendar()
        self.dirwin   = DirectoryWindow(self.calendar.get_selected_day())
        self.append(self.calendar)
        self.append(self.dirwin)
        self.get_first_child().connect("day-selected", self.on_day_selected)

    def on_day_selected(self, calendar):
        self.dirwin.set_directory(self.calendar.get_selected_day())

    def select_none(self):
        self.dirwin.select_none()


class Stack(Gtk.Stack):
    def __init__(self):
        Gtk.Stack.__init__(self, transition_type=Gtk.StackTransitionType.OVER_LEFT_RIGHT)
        self.date = DatePage()
        self.tags = DirectoryWindow(common.XFSTESTS_TAGS, autoexpand=False)
        self.add_titled(self.date, "Date", "Date")
        self.add_titled(self.tags, "Tags", "Tags")
        self.date.dirwin.connect("test-selected", self.on_test_selected)
        self.tags.connect("test-selected", self.on_test_selected)
        self.connect("notify::visible-child", self.on_page_changed)

    def on_test_selected(self, widget, test):
        self.emit("test-selected", test)

    def on_page_changed(self, stack, param):
        stack.get_visible_child().select_none()
        self.emit("test-selected", None)

    @GObject.Signal(arg_types=(Path,))
    def test_selected(self, path): pass