# Copyright 2021 (c) Anna Schumaker.
import re
from gi.repository import Gtk
from . import version

class Regex(Gtk.Filter):
    def __init__(self):
        Gtk.Filter.__init__(self)
        self.pattern = re.compile("")

    def do_match(self, item):
        raise NotImplementedError

    def search(self, text):
        return self.pattern.search(text) != None

    def set_pattern(self, pattern):
        change = Gtk.FilterChange.DIFFERENT
        if pattern in self.pattern.pattern:
            change = Gtk.FilterChange.LESS_STRICT
        elif self.pattern.pattern in pattern:
            change = Gtk.FilterChange.MORE_STRICT

        self.pattern = re.compile(pattern, re.I)
        self.changed(change)


class Popover(Gtk.Popover):
    def __init__(self):
        Gtk.Popover.__init__(self)
        self.set_child(Gtk.Label())
        self.set_autohide(False)

    def popup(self, text):
        self.get_child().set_text(text)
        if not version.TESTING:
            super().popup()


class Entry(Gtk.SearchEntry):
    def __init__(self, filter):
        Gtk.SearchEntry.__init__(self)
        self.filter = filter
        self.popover = Popover()

        self.set_margin_top(5)
        self.set_margin_bottom(5)
        self.set_margin_start(5)
        self.set_margin_end(5)

        self.set_property("placeholder-text", "Type to filter")
        self.connect("search-changed", self.changed)
        self.popover.set_parent(self)

    def __del__(self):
        self.popover.unparent()

    def changed(self, entry):
        try:
            self.filter.set_pattern(self.get_text())
            self.remove_css_class("warning")
            self.popover.popdown()
        except re.error as e:
            self.add_css_class("warning")
            self.popover.popup(str(e))