# Copyright (c) 2021 elParaguayo
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
from __future__ import annotations

import os
from typing import TYPE_CHECKING

import cairocffi
from libqtile.backend.base import Drawer
from libqtile.images import Img
from libqtile.images import Loader as QtileLoader
from libqtile.images import LoadingError
from libqtile.log_utils import logger
from libqtile.utils import scan_files

if TYPE_CHECKING:
    from libqtile.utils import ColorsType


class ImgMask(Img):
    """
    Image object that uses the image source as a mask to paint the background.

    Colour can be set at the moment of drawing, rather than preparing images in
    advance.
    """

    def __init__(self, *args, drawer: Drawer | None = None, **kwargs):
        self.drawer = drawer
        Img.__init__(self, *args, **kwargs)

    def attach_drawer(self, drawer: Drawer):
        self.drawer = drawer

    def draw(self, x=0, y=0, colour: "ColorsType" = "FFFFFF"):
        if self.drawer is None:
            logger.error("Cannot draw masked image. Did you forget to attach the drawer?")
            return

        self.drawer.ctx.save()
        self.drawer.set_source_rgb(colour)
        self.drawer.ctx.set_operator(cairocffi.OPERATOR_SOURCE)
        self.drawer.ctx.translate(x, y)
        self.drawer.ctx.mask(self.pattern)
        self.drawer.ctx.fill()
        self.drawer.ctx.restore()


class Loader(QtileLoader):
    """
    Same as libqtile.images.Loader but takes an optional parameter,
    ``masked``, to determine whether to use ``ImgMask`` class.
    """

    def __init__(self, *directories, masked=True, **kwargs):
        self.img_class = ImgMask if masked else Img
        QtileLoader.__init__(self, *directories, **kwargs)

    def __call__(self, *names):
        d = {}
        seen = set()
        set_names = set()
        for n in names:
            root, ext = os.path.splitext(n)
            if ext:
                set_names.add(n)
            else:
                set_names.add(n + ".*")

        for directory in self.directories:
            d_matches = scan_files(directory, *(set_names - seen))
            for name, paths in d_matches.items():
                if paths:
                    d[name if name in names else name[:-2]] = self.img_class.from_path(paths[0])
                    seen.add(name)

        if seen != set_names:
            msg = "Wasn't able to find images corresponding to the names: {}"
            raise LoadingError(msg.format(set_names - seen))

        return d
