from kivy.app import App
from kivy.graphics import *
from kivy.properties import ObjectProperty
from kivy.uix.widget import Widget
from kivy.utils import get_color_from_hex

HEX_SIZE = 100
HORIZONTAL_BUFFER = 0.9
VERTICAL_BUFFER = 0.8


class HexMap(Widget):
    # TODO: Incorporate design into main application.
    coords_display = ObjectProperty(None)

    def __init__(self, **kwargs):
        super(HexMap, self).__init__(**kwargs)
        self.redraw_scene()

        # It is crucial to redraw the scene whenever the scene or position changes.
        self.bind(size=self.redraw_scene, pos=self.redraw_scene)

        self.updates = 0
        self.on_touch_down = self.update_coords

    def redraw_scene(self, *args):
        with self.canvas:
            # Clear scene
            Color(*get_color_from_hex("#000000ff"))
            Rectangle(
                pos=(0, 0),
                size=(self.width, self.height)
            )

            # Draw a hexagon in a decent spot.
            tiles_in_even_row = int(self.width / (HEX_SIZE * HORIZONTAL_BUFFER))
            tiles_in_odd_row = int((self.width - HEX_SIZE / 2) / (HEX_SIZE * HORIZONTAL_BUFFER))
            tiles_in_col = int(self.height / (HEX_SIZE * VERTICAL_BUFFER))

            for y in range(tiles_in_col):

                even_row = y % 2 == 0
                hex_color = "#0000dd55" if even_row else "#dd000055"
                tiles_in_row = tiles_in_even_row if even_row else tiles_in_odd_row

                y_position = y * HEX_SIZE * VERTICAL_BUFFER

                for x in range(tiles_in_row):
                    Color(*get_color_from_hex(hex_color))

                    x_position = x * HEX_SIZE * HORIZONTAL_BUFFER
                    if not even_row:
                        x_position += 0.5 * HEX_SIZE * HORIZONTAL_BUFFER

                    Ellipse(
                        pos=(x_position, y_position),
                        segments=6,
                        size=(HEX_SIZE, HEX_SIZE),
                    )

    def update_coords(self, touch_event):
        self.coords_display.text = "Touched at {}".format(touch_event.spos)
        # TODO: Add in finding of hexes by what position found at touch event.
        # TODO: May need a buffer around "untouchable" regions"
        return True


class HexMapApp(App):
    pass


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