# tool_brush.py
#
# Copyright 2018-2021 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/>.

from gi.repository import Gdk
from .abstract_classic_tool import AbstractClassicTool

from .brush_simple import BrushSimple
from .brush_airbrush import BrushAirbrush
from .brush_nib import BrushNib
from .brush_hairy import BrushHairy

class ToolBrush(AbstractClassicTool):
	__gtype_name__ = 'ToolBrush'

	def __init__(self, window, **kwargs):
		super().__init__('brush', _("Brush"), 'tool-brush-symbolic', window)
		self.use_operator = True
		self._last_use_pressure = False

		self._brushes_dict = {
			'simple': BrushSimple('simple', self),
			'airbrush': BrushAirbrush('airbrush', self),
			'calligraphic': BrushNib('calligraphic', self),
			'hairy': BrushHairy('hairy', self),
		}

		self._brush_type = 'simple'
		self._brush_dir = 'right'
		self.add_tool_action_enum('brush-type', self._brush_type)
		self.add_tool_action_enum('brush-dir', self._brush_dir)

	def get_options_label(self):
		return _("Brush options")

	def get_edition_status(self):
		self._brush_type = self.get_option_value('brush-type')
		self._brush_dir = self.get_option_value('brush-dir')

		enable_direction = self._brush_type == 'calligraphic'
		self.set_action_sensitivity('brush-dir', enable_direction)

		active_brush = self._brushes_dict[self._brush_type]
		return active_brush._get_status(self._last_use_pressure, self._brush_dir)

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

	def on_press_on_area(self, event, surface, event_x, event_y):
		self.set_common_values(event.button, event_x, event_y)
		self._manual_path = []
		self._add_pressured_point(event_x, event_y, event)
		self._last_use_pressure = self._manual_path[0]['p'] is not None

	def on_motion_on_area(self, event, surface, event_x, event_y):
		self._add_pressured_point(event_x, event_y, event)
		operation = self.build_operation()
		self.do_tool_operation(operation)

	def on_release_on_area(self, event, surface, event_x, event_y):
		self._add_pressured_point(event_x, event_y, event)
		operation = self.build_operation()
		operation['is_preview'] = False
		self.apply_operation(operation)

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

	def _add_pressured_point(self, event_x, event_y, event):
		new_point = {
			'x': event_x,
			'y': event_y,
			'p': self._get_pressure(event)
		}
		self._manual_path.append(new_point)

	def _get_pressure(self, event):
		device = event.get_source_device()
		# print(device)
		if device is None:
			return None
		# source = device.get_source()
		# print(source) # J'ignore s'il faut faire quelque chose de cette info

		tool = event.get_device_tool()
		# print(tool) # ça indique qu'on a ici un appareil dédié au dessin (vaut
		# `None` si c'est pas le cas). Autrement on peut avoir des valeurs comme
		# Gdk.DeviceToolType.PEN, .ERASER, .BRUSH, .PENCIL, ou .AIRBRUSH, et
		# aussi (même si jsuis pas sûr ce soit pertinent) .UNKNOWN, .MOUSE et
		# .LENS, on pourrait adapter le comportement (couleur/opérateur/etc.)
		# à cette information à l'avenir.

		pressure = event.get_axis(Gdk.AxisUse.PRESSURE)
		# print(pressure)
		if pressure is None:
			return None
		return pressure

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

	def build_operation(self):
		operation = {
			'tool_id': self.id,
			'brush_id': self._brush_type,
			'nib_dir': self._brush_dir,
			'rgba': self.main_color,
			'operator': self._operator,
			'line_width': self.tool_width,
			'antialias': self._use_antialias,
			'is_preview': True,
			'path': self._manual_path
		}
		return operation

	def do_tool_operation(self, operation):
		if operation['path'] is None or len(operation['path']) < 1:
			return
		cairo_context = self.start_tool_operation(operation)

		active_brush = self._brushes_dict[operation['brush_id']]
		active_brush.do_brush_operation(cairo_context, operation)

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

