#!/usr/bin/env sh

# if we have a conda prefix, ensure it's still used
if [ -n "${_RS_CONDA_PREFIX}" ]; then

	# if we're running on WSL, we need to convert the path
	# here to a Linux-style path
	if command -v wslpath >/dev/null 2>&1; then
		_RS_CONDA_PREFIX=$(wslpath "${_RS_CONDA_PREFIX}")
	fi

	# ideally, we'd call conda activate here,
	# but users (especially on Windows) might not
	# have called 'conda init' with their shell,
	# so we fake the process here
	CONDA_PREFIX="${_RS_CONDA_PREFIX}"
	export CONDA_PREFIX

	# on Windows, we need to put a number of locations
	# on the PATH for conda utilities to function
	#
	# in particular, conda's crypto libraries need to
	# be on the PATH for 'conda install' to function
	case "$(uname -s)" in
	MINGW32*)
		
		if command -v cygpath >/dev/null 2>&1; then
			_CONDA_PREFIX=$(cygpath "${CONDA_PREFIX}")
		fi
		
		_CONDA_SUFFIXES=(
			bin
			Scripts
			Library/bin
			Library/usr/bin
			Library/mingw-w64/bin
		)
		
		for _CONDA_SUFFIX in ${_CONDA_SUFFIXES[@]}; do
			PATH="${_CONDA_PREFIX}/${_CONDA_SUFFIX}:${PATH}"
		done

		unset _CONDA_PREFIX
		unset _CONDA_SUFFIX
		unset _CONDA_SUFFIXES
	;;
	esac

	# unset CONDA_PROMPT_MODIFIER for project-local envs
	# (look for slash in environment variable value)
	case "${PS1}" in
	"${CONDA_PROMPT_MODIFIER}"*)
		PS1="${PS1:${#CONDA_PROMPT_MODIFIER}}"
		unset CONDA_PROMPT_MODIFIER
	;;
	esac

	unset _RS_CONDA_PREFIX

fi

if [ -f "${RETICULATE_PYTHON}" ]; then

	_RS_PYTHON_BIN=$(dirname "${RETICULATE_PYTHON}")

	# munge path for MINGW32 if necessary
	case "$(uname -s)" in
	MINGW32*)
		if command -v cygpath >/dev/null 2>&1; then
			_RS_PYTHON_BIN=$(cygpath "${_RS_PYTHON_BIN}")
		fi
	;;
	esac

	# if a Scripts sub-directory exists, place that on
	# the PATH as well (primarily for conda on Windows)
	if [ -d "${_RS_PYTHON_BIN}/Scripts" ]; then
		PATH="${_RS_PYTHON_BIN}/Scripts:${PATH}"
	fi

	# check for an activate script in the same directory
	# as the configured version of Python; if it exists,
	# use that to activate Python (mainly for venv)
	#
	# note that this might also discover a conda activate
	# script; unfortunately, running that isn't sufficient
	# to update the PATH so we make that check below as well
	if [ -f "${_RS_PYTHON_BIN}/activate" ]; then
		. "${_RS_PYTHON_BIN}/activate"
	fi

	# ensure that our python was placed on the PATH
	if [ "$(echo "${PATH}" | cut -d":" -f"1")" != "${_RS_PYTHON_BIN}" ]; then
		PATH="${_RS_PYTHON_BIN}:${PATH}"
	fi

	unset _RS_PYTHON_BIN

fi

