#!/usr/bin/env python3
# coding=utf-8
#
# Copyright (C) 2022 Mikael Nordin, hej@mic.ke
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA  02110-1301, USA.
#
"""
Description of this extension
"""
import inkex
from inkex import Image as IImage
import gi
import io
import base64
from PIL import Image

gi.require_version("Gtk", "3.0")
gi.require_version("Gdk", "3.0")
from gi.repository import Gtk, Gdk  # noqa: E402


class GeoReferencerPoint():
    def __init__(self, x: int, y: int, to_x: int = 0, to_y: int = 0) -> None:
        self.x: int = x
        self.y: int = y
        self.to_x: int = to_x
        self.to_y: int = to_y


class GeoReferencer():
    def __init__(self, window) -> None:
        self.points: list[GeoReferencerPoint] = list()
        self.window = window

    def add_point(self, point: GeoReferencerPoint) -> None:
        self.points.append(point)

    def add_img(self, img) -> None:
        self.img = img

    def do_transform(self):
        pass


class GeoReferencerWindow(Gtk.Window):
    def __init__(self) -> None:
        super().__init__(title="Georeferencer")
        self.georeferencer: GeoReferencer = GeoReferencer(self)
        self.set_events(Gdk.EventMask.POINTER_MOTION_MASK |
                        Gdk.EventMask.BUTTON_PRESS_MASK)
        self.box: Gtk.Box = Gtk.Box()
        self.add(self.box)
        self.button: Gtk.Button = Gtk.Button(label="Georeference")
        self.button.connect("clicked", self.on_button_clicked)
        self.box.pack_start(self.button, True, True, 0)
        self.event_box: Gtk.EventBox = Gtk.EventBox()
        self.event_box.set_above_child(above_child=True)
        self.event_box.connect('motion-notify-event', self.on_motion_notify)
        self.event_box.connect('enter-notify-event', self.on_motion_notify)
        self.event_box.connect('button-press-event', self.on_mouse_click)
        self.box.pack_start(self.event_box, True, True, 0)
        self.connect("destroy", Gtk.main_quit)

    def debug_box(self, message: str):
        dialog = Gtk.MessageDialog(transient_for=self,
                                   modal=False, destroy_with_parent=True,
                                   message_type=Gtk.MessageType.INFO,
                                   buttons=Gtk.ButtonsType.OK,
                                   text=message)
        dialog.show_all()
        dialog.run()
        dialog.destroy()

    def on_button_clicked(self, widget) -> None:
        img = self.georeferencer.do_transform()
        self.event_box.remove(self.image)
        self.image = img
        self.event_box.add(self.image)
        self.image.show_all()
        self.queue_draw()
        # self.destroy()

    def on_motion_notify(self, widget, event) -> None:
        widget.set_tooltip_text("x:{}, y:{}".format(event.x, event.y))

    def on_mouse_click(self, widget, event) -> None:
        dialog = Gtk.MessageDialog(transient_for=self,
                                   modal=True, destroy_with_parent=True,
                                   message_type=Gtk.MessageType.QUESTION,
                                   buttons=Gtk.ButtonsType.OK_CANCEL,
                                   text="Set new coordinates")
        point_box = dialog.get_content_area()
        x_label = Gtk.Label()
        y_label = Gtk.Label()
        x_label.set_text("x:")
        y_label.set_text("y:")
        x_entry = Gtk.Entry()
        y_entry = Gtk.Entry()
        point_box.pack_start(x_label, True, True, 0)
        point_box.pack_start(x_entry, True, True, 0)
        point_box.pack_start(y_label, True, True, 0)
        point_box.pack_start(y_entry, True, True, 0)
        dialog.show_all()
        response = dialog.run()
        if response == Gtk.ResponseType.OK:
            to_x = int(x_entry.get_text())
            to_y = int(y_entry.get_text())
            point = GeoReferencerPoint(event.x, event.y, to_x, to_y)
            self.georeferencer.add_point(point)
        dialog.destroy()

    def add_image(self, img):
        self.image = img
        self.georeferencer.add_img(self.image)
        self.event_box.add(self.image)
        self.show_all()


class CoordinatesExtension(inkex.EffectExtension):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.window: GeoReferencerWindow = GeoReferencerWindow()

    def effect(self) -> None:
        images = self.svg.selection.get(IImage)
        for elem in images:
            xlink = elem.get("xlink:href")
            if xlink is not None and xlink[:5] == "data:":
                data = xlink[5:]
                (mimetype, data) = data.split(";", 1)
                (base, data) = data.split(",", 1)
                if base != "base64":
                    self.debug_box(
                        "Unable to decode encoding {}.").format(base)
                else:
                    imgdata = base64.b64decode(data)
                    image = Image.open(io.BytesIO(imgdata))

        self.window.add_image(image)
        self.window.show_all()
        Gtk.main()


if __name__ == '__main__':
    CoordinatesExtension().run()