# Copyright 1999-2022 Gentoo Authors
# Distributed under the terms of the GNU General Public License v2

EAPI=8

DISTUTILS_USE_PEP517=setuptools
PYTHON_COMPAT=( python3_{8..10} )

inherit distutils-r1

DESCRIPTION="Open source UI framework written in Python"
HOMEPAGE="https://kivy.org"

LICENSE="MIT"
SLOT="0"
IUSE="
	X +buildozer doc examples gles2 highlight +imaging opengl pango pygame
	pytest gstreamer rst +sdl spell vim-syntax wayland
"
REQUIRED_USE="
	gles2? ( opengl )
	pygame? ( sdl )
"

# All Kivy dependencies (except those enabling "USE_*" environment variables
# exported by the python_compile() phase) are runtime-only. Note that:
# * Cython is mandatory, despite "setup.py" containing a "can_use_cython" bool.
# * Pygame and SDL2 are mutually incompatible, as the former assumes SDL1.
# * "setup.cfg" lists numerous *OPTIONAL RUNTIME* dependencies as *MANDATORY
#   BUILD-TIME* dependencies, including:
#     install_requires =
#         Kivy-Garden>=0.1.4
#         docutils
#         pygments
#
# Technically, we *COULD* omit those dependencies below. Why? Because Portage's
# PEP 517-compliant integration with "setuptools" ignores "setup.cfg".
# Pragmatically, doing so would erroneously attempt to install one or more of
# those dependencies when a downstream user editably installs their Kivy app:
#     # This will attempt to install those dependencies.
#     $ sudo python3.10 -m pip install -e .
#
# Ergo, we defer to Kivy's erroneous "setup.cfg" and list those dependencies.
# When Kivy removes those dependencies from "setup.cfg":
# * The "highlight" USE flag will still require an optional runtime dependency
#   on "pygments": e.g.,
#       highlight? ( dev-python/pygments[${PYTHON_USEDEP}] )
# * The "rst" USE flag will still require an optional runtime dependency on
#   "docutils": e.g.,
#       rst? ( dev-python/docutils[${PYTHON_USEDEP}] )
BEPEND="
	virtual/pkgconfig
	>=dev-python/cython-0.24.0[${PYTHON_USEDEP}]
"
DEPEND="
	X? (
		x11-libs/libX11
		x11-libs/libXrender
	)
	gstreamer? ( dev-python/gst-python:1.0[${PYTHON_USEDEP}] )
	opengl? ( media-libs/mesa[X?,gles2?,wayland?] )
	pango? ( x11-libs/pango[X?] )
	wayland? ( dev-libs/wayland )
"
RDEPEND="${DEPEND}
	dev-python/Kivy-Garden[${PYTHON_USEDEP}]
	dev-python/docutils[${PYTHON_USEDEP}]
	dev-python/pygments[${PYTHON_USEDEP}]
	buildozer? ( dev-python/buildozer[${PYTHON_USEDEP}] )
	imaging? ( dev-python/pillow[${PYTHON_USEDEP}] )
	pytest? (
		dev-python/pytest[${PYTHON_USEDEP}]
		dev-python/pytest-asyncio[${PYTHON_USEDEP}]
	)
	sdl? (
		pygame? ( dev-python/pygame[X?,opengl?,${PYTHON_USEDEP}] )
		!pygame? (
			media-libs/libsdl2[X?,wayland?]
			media-libs/sdl2-image
			media-libs/sdl2-mixer
			media-libs/sdl2-ttf
		)
	)
	spell? ( dev-python/pyenchant[${PYTHON_USEDEP}] )
"

DISTUTILS_IN_SOURCE_BUILD=

#FIXME: Upstream fails to bundle the "tests/" directory with source tarballs.
# distutils_enable_tests pytest
distutils_enable_sphinx docs

if [[ ${PV} == 9999 ]]; then
	inherit git-r3

	EGIT_REPO_URI="https://github.com/kivy/kivy.git"
	EGIT_BRANCH="master"
	SRC_URI=""
	KEYWORDS=""
else
	# Strip all underscores from this package's version (e.g., reduce
	# "2.3.0_rc3" to "2.3.0rc3").
	MY_PV=${PV//_}
	MY_P=${PN}-${MY_PV}

	SRC_URI="mirror://pypi/${PN:0:1}/${PN}/${MY_P}.tar.gz"
	KEYWORDS="~amd64 ~x86"

	S="${WORKDIR}/${MY_P}"
fi

python_prepare_all() {
	# If enabling Vim integration, strip all Windows-specific carriage return
	# characters from files subsequently installed by this USE flag.
	if use vim-syntax; then
		sed -i -e 's~'$'\r''~~g' kivy/tools/highlight/kivy.vim || die
	fi

	distutils-r1_python_prepare_all
}

python_compile() {
	#FIXME: Add the following back below *AFTER* upstream resolves this issue:
	#    https://github.com/kivy/kivy/issues/7824
	# USE_MESAGL=$(usex opengl 1 0) \
	#FIXME: Additionally add support for "KIVY_SPLIT_EXAMPLES". Since we're
	#unsure what exactly that does, we choose to conveniently ignore that.

	# Export environment variables expected by this package's "setup.py"
	# (listed in the same order for maintainability). However, note that:
	# * These variables are almost entirely undocumented. It is what it is.
	# * These variables are listed undercase in "setup.py" but *MUST*
	#   nonetheless be declared as uppercase here. It is what it is.
	# * The values of these variables *MUST* be either:
	#   * "1" to signify a "True" boolean value.
	#   * "0" to signify a "False" boolean value.
	# * The "KIVY_BUILD_EXAMPLES" environment variable (and corresponding
	#   "--build-examples" option) should *NEVER* be enabled. For unknown
	#   reasons, Kivy reuses the same "setup.py" script to install either Kivy
	#   *OR* the external "Kivy-examples" package. That's not the insane part.
	#   The insane part is that these two installation targets are mutually
	#   exclusive. You can either install Kivy *OR* you can install
	#   "Kivy-examples". Pick one. Obviously, anyone installing Kivy wants Kivy
	#   to be installed. If they wanted a separate "Kivy-examples" package, they
	#   should have just packaged "Kivy-examples" as a real honest project.
	# * The "KIVY_SPLIT_EXAMPLES" environment variable installs examples to an
	#   unversioned "/usr/share/kivy-examples" directory, which violates Gentoo
	#   packaging norms. Instead, we simply manually install examples below.
	USE_EGL=$(usex opengl 1 0) \
	USE_OPENGL_ES2=$(usex gles2 1 0) \
	USE_SDL2=$(usex sdl 1 0) \
	USE_PANGOFT2=$(usex pango 1 0) \
	USE_X11=$(usex X 1 0) \
	USE_WAYLAND=$(usex wayland 1 0) \
	USE_GSTREAMER=$(usex gstreamer 1 0) \
	KIVY_BUILD_EXAMPLES=0 \
	KIVY_SPLIT_EXAMPLES=0 \
		distutils-r1_python_compile
}

python_install_all() {
	if use examples; then
		dodoc -r examples
	fi

	if use vim-syntax; then
		insinto /usr/share/vim/vimfiles/syntax
		doins kivy/tools/highlight/kivy.vim
	fi

	distutils-r1_python_install_all
}