#!/usr/bin/env python3
"""
Syncthing-GTK - Ident Icon

Custom widget derived from Gtk.DrawingArea.
Draws Ident Icon on transparent background.

Most of drawing code is ported from
https://github.com/syncthing/syncthing/blob/master/gui/scripts/syncthing/core/directives/identiconDirective.js"""


import re

from gi.repository import Gtk

from syncthing_gtk.infobox import InfoBox


class IdentIcon(Gtk.DrawingArea):
    def __init__(self, device_id):
        Gtk.DrawingArea.__init__(self)
        self.value = re.sub(r'[\W_]', "", device_id, 1)
        self.color = (1, 1, 0.95, 1)		# icon color, rgba
        self.size = 5

    def set_color_hex(self, hx):
        """ Expects AABBCC or #AABBCC format """
        self.set_color(*InfoBox.hex2color(hx))

    def set_color(self, r, g, b, a):
        """ Expects floats """
        self.color = (r, g, b, a)
        self.queue_draw()

    def do_get_preferred_width(self):
        # Icon scales to whatever you give, but preferred
        # size is always 22x22
        return (22, 22)

    def do_get_preferred_height(self):
        # Rectangle...
        return self.do_get_preferred_width()

    def do_get_request_mode(self):
        return Gtk.SizeRequestMode.CONSTANT_SIZE

    def do_draw(self, cr):
        def fill_rect_at(row, col, ox, oy, rs):
            cr.rectangle(
                ox + (col * rs),
                oy + (row * rs),
                rs, rs
            )
            cr.fill()

        def should_fill_rect_at(row, col):
            return not (ord(self.value[row + col * self.size]) % 2)

        def should_mirror_rect_at(row, col):
            return not (self.size % 2 and col == middle_col)

        def mirror_col_for(col):
            return self.size - col - 1

        # Prepare stuff
        allocation = self.get_allocation()
        rect_size = min(allocation.width, allocation.height) / self.size
        offset_x = (allocation.width // 2) - (rect_size * self.size // 2)
        offset_y = (allocation.height // 2) - (rect_size * self.size // 2)
        middle_col = self.size // 2

        # Set color
        cr.set_source_rgba(*self.color)
        # Do drawing
        for row in range(0, self.size):
            for col in range(0, middle_col + 1):
                if should_fill_rect_at(row, col):
                    fill_rect_at(row, col, offset_x, offset_y, rect_size)
                    if should_mirror_rect_at(row, col):
                        fill_rect_at(row, mirror_col_for(col),
                                     offset_x, offset_y, rect_size)