# abstract_classic_tool.py
#
# Copyright 2018-2023 Romain F. T.
#
# 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 3 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, see <http://www.gnu.org/licenses/>.

import cairo
from .abstract_tool import AbstractAbstractTool
from .optionsbar_classic import OptionsBarClassic
from .utilities_colors import utilities_gdk_rgba_to_normalized_array

class AbstractClassicTool(AbstractAbstractTool):
	__gtype_name__ = 'AbstractClassicTool'

	def __init__(self, tool_id, label, icon_name, window, **kwargs):
		super().__init__(tool_id, label, icon_name, window)
		self.menu_id = 0
		self.use_color = True
		self.use_size = True
		self.accept_selection = False

		self.tool_width = 10
		self.main_color = None
		self.secondary_color = None
		self._fallback_operator = 'over'
		self._operator = cairo.Operator.OVER
		self.x_press = 0
		self.y_press = 0
		self._use_antialias = self.load_tool_action_boolean('antialias', \
		                                                     'use-antialiasing')
		# XXX honteusement sous-performant ^

	############################################################################
	# UI implementations #######################################################

	def try_build_pane(self):
		self.pane_id = 'classic'
		self.window.options_manager.try_add_bottom_pane(self.pane_id, self)

	def build_bottom_pane(self):
		return OptionsBarClassic(self.window)

	############################################################################
	# Options ##################################################################

	def set_common_values(self, event_btn, event_x, event_y):
		self._use_antialias = self.get_option_value('antialias')
		self.tool_width = self.window.options_manager.get_tool_width()
		left_c = self.window.options_manager.get_left_color()
		right_c = self.window.options_manager.get_right_color()
		if event_btn == 1:
			self.main_color = utilities_gdk_rgba_to_normalized_array(left_c)
			self.secondary_color = utilities_gdk_rgba_to_normalized_array(right_c)
		if event_btn == 3:
			self.main_color = utilities_gdk_rgba_to_normalized_array(right_c)
			self.secondary_color = utilities_gdk_rgba_to_normalized_array(left_c)
		self.x_press = event_x
		self.y_press = event_y
		self._operator = self.window.options_manager.get_operator()[0]

	############################################################################
	# Operations common methods ################################################

	def start_tool_operation(self, operation):
		super().start_tool_operation(operation)
		context = self.get_context()
		if 'antialias' not in operation:
			antialias = cairo.Antialias.DEFAULT
		elif operation['antialias']:
			antialias = cairo.Antialias.DEFAULT
		else:
			antialias = cairo.Antialias.NONE
		context.set_antialias(antialias)
		return context

	def set_dashes_and_cap(self, cairo_context, lw, dashes_type, line_cap):
		"""Set a cairo dash pattern to the given context. The pattern we want
		is described by its name as a string (`dashes_type`), but the actual
		lengths that cairo wants depend also on the line width (`lw`) and the
		`line_cap`. The line cap is also set here."""
		cairo_context.set_line_cap(line_cap)
		dashes_descriptor = []
		if dashes_type == 'regular':
			dashes_descriptor = [2, 2]
		elif dashes_type == 'long':
			dashes_descriptor = [3, 1]
		elif dashes_type == 'dots':
			dashes_descriptor = [1, 1]
		elif dashes_type == 'alt':
			dashes_descriptor = [3, 1, 1, 1]

		i = 0
		for length in dashes_descriptor:
			if line_cap != cairo.LineCap.BUTT:
				if i % 2 == 0:
					length = length - 1
				else:
					length = length + 1
			actual_length = length * lw
			if length == 0:
				actual_length = actual_length + 1
			dashes_descriptor[i] = actual_length
			i = i + 1
		cairo_context.set_dash(dashes_descriptor)

	############################################################################
################################################################################