#!/bin/bash
#
# An easy way to set up a virtualenv.
#
# Source this file to work inside this venv:
#
#     source ./venv [-f]
#
# Call `./venv -f` to force a new development installation.
#

SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

# If on Macos with brew, make sure we can find the brewed libffi (which is not "linked"):
printf "Are we on Macos with Homebrew installed? "
uname -a | grep -q Darwin && brew --version >/dev/null 2>&1 && {
	echo "Yes"
	libffi_path="$(brew ls libffi | grep pkgconfig | xargs dirname)"
	echo "Adding libffi pkg-config path ${libffi_path} to \$PKG_CONFIG_PATH"
	export PKG_CONFIG_PATH="${libffi_path}:${PKG_CONFIG_PATH:-}"
} || echo "No"

printf "Are we on MSys (Windows)? "
uname -a | grep -q MSYS_NT && {
	echo "Yes"
	export PKG_CONFIG_PATH="/mingw64/lib/pkgconfig:${PKG_CONFIG_PATH:-}"
	export PATH="/mingw64/bin:${PATH}"
} || echo "No"

# shellcheck disable=SC1091,SC1090
(
	# Do the whole installation process in a sub-shell, so we can safely fail when
	# this file is sourced in the parent shell.
	set -euo pipefail

	check() {
		echo Checking: "$@"
		"$@" >/dev/null 2>&1
	}

	NO_FORCE_INSTALL=true

	while getopts 'fSh' OPTION
	do
			case "$OPTION" in
			f)
					NO_FORCE_INSTALL=false
					;;
			S)
					VENV_OPTS="--system-site-packages"
					;;
			h)		echo "Usage: $0 [-f] [-S] [-h]  # -f = force install, -S = Use system site packages, -h = this message"
					exit 0 ;;
      *)    echo "usage: $0 [-f] [-S] [-h]" >&2
          exit 1 ;;
			esac
	done

	check python3 --version || {
		echo "==> Python 3.x not found"
		exit 1
	}

	check pkg-config --print-errors --exists 'gobject-introspection-1.0 >= 1.46.0' || {
		echo "==> GObject-Introspection not found, Please check above errors and correct them"
		exit 1
	}

	PYTHON_VER="$(python3 --version | sed 's/^Python \([0-9]\.[0-9]\).[0-9]$/\1/')"

	test -d "$SCRIPT_DIR"/.venv || {
		echo "Setting up a virtual env for Gaphor..."
		python3 -m venv --prompt Gaphor ${VENV_OPTS:-} "$SCRIPT_DIR"/.venv
	}

	# shellcheck source=.venv/bin/activate
	source "$SCRIPT_DIR"/.venv/bin/activate

	{ ${NO_FORCE_INSTALL} && test -f "$SCRIPT_DIR"/.venv/lib/python"${PYTHON_VER}"/site-packages/gaphor.egg-link; } || {
		echo "Installing Gaphor in the virtualenv..."

		pip install --upgrade poetry==1.0.10
		poetry install
	}

	test_module() {
		python3 -c "$1" 2>&- || {
			echo "$2"
			echo
			echo "The Command used to test this:"
			echo
			echo "    >>> $1"
			echo
			echo "Please read the installation instructions on https://gaphor.readthedocs.io."
			exit 1
		}
	}

	test_module \
		"import gi" \
		"PyGobject3 (gobject-introspection) can not be loaded."

	test_module \
		"from gi.repository import Gtk" \
		"Gtk3 is not installed in a way it can be loaded in Python."

	test_module \
		"import gaphor.UML" \
		"Gaphor was not installed properly. Please open an issue on GitHub."

) && source "$SCRIPT_DIR"/.venv/bin/activate