# Copyright (C) 2012  Belledonne Comunications, Grenoble, France
#
#  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 2 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, write to the Free Software
#  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

# Created by Gautier Pelloux-Prayer on 2014/10/24.
# This script adds auto-completion for liblinphone_tester binary for Bash and
# Zsh. To use it, just type: `source liblinphone_completion`, then for each
# supported exectuable (see end of file), you will get auto-completions.
# To use it permanently, source this file in your .rc file (.bashrc or .zshrc).

_liblinphone_complete() {
	local completions command_requiring_argument prev_arg latest_arg available_tasks has_not_set_suite suite_name

	if [ -n "$BASH_VERSION" ]; then
		set -- "${COMP_WORDS[@]}" #convert them to arguments (eg $1,$#,$@,etc.)
	elif [ -n "$ZSH_VERSION" ]; then
		local args
		read -cA args #read list of arguments user entered
		set -- "${args[@]}" #convert them to arguments (eg $1,$#,$@,etc.)
	fi
	#skip program name
	program=$1
	shift

	# if user required help, do not complete anything
	if ! grep -q -- "--help" <<< "$@"; then
		# retrieve the last argument
		latest_arg=""
		prev_arg=""
		latest_is_empty=0
		for arg in "$@"; do
			if [ ! -z "$arg" ]; then
				prev_arg="$latest_arg"
				latest_arg="$arg"
			else
				latest_is_empty=1
			fi
		done

		# get the tasks available, from --help
		available_tasks="$($program 2>&1 --help | sed -nE "s/.*--([^ ]*).*/--\\1/p")"

		# these commands expect an argument
		command_requiring_argument="$($program 2>&1 --help | sed -nE "s/.*--(.*) <.*/--\\1/p")"

		# remove all already provided tasks (it's useless to provide them twice)
		if [[ ! -z "$@" ]]; then
			current_tasks=$(echo $@ | grep -Eo -- "--([^ ])*" | tr '\n' '|' | sed 's/|/$|/g')--$
			if [ ! -z "$current_tasks" ]; then
				available_tasks=$(echo "$available_tasks" | grep -vE -- "(${current_tasks})")
			fi
		fi
		# remove --test option if --suite is not provided yet!
		has_not_set_suite=$(grep -q -- "--suite" <<< "$@"; echo $?)
		if [ $has_not_set_suite = 1 ]; then
			available_tasks=$(echo "$available_tasks" | grep -v -- --test)
		fi

		# if latest arg does not start with '--', it is a custom value
		if [ $latest_is_empty = 0 ] && ! grep -q -- '^--' <<< "$latest_arg"; then
			if [ "$prev_arg" = "--test" ] && [ $has_not_set_suite = 0 ]; then
				suite_name=$(echo $@ | sed -nE 's/.*--suite ([^(--)]*) (--.*)$/\1/p' |sed "s@\\\\@@g")
				completions="$($program --list-tests $suite_name)"
			elif [ "$prev_arg" = "--suite" ] || [ "$prev_arg" = "--list-tests" ]; then
				completions="$($program --list-suites)"
			fi
		elif [ "$latest_arg" = "--test" ]; then
			# list available tests if --suite was provided
			if [ $has_not_set_suite = 0 ]; then
				suite_name=$(echo $@ | sed -nE 's/.*--suite ([^(--)]*) (--.*)/\1/p' |sed "s@\\\\@@g")
				completions="$($program --list-tests $suite_name)"
			fi
		elif [ "$latest_arg" = "--suite" ] || [ "$latest_arg" = "--list-tests" ]; then
			completions="$($program --list-suites)"
		# we are waiting for a custom value, so do not hint anything
		elif [[ ! -z "$latest_arg" ]] && grep -q -- "^$latest_arg$" <<< "$command_requiring_argument"; then
			completions=""
		else
			completions="$available_tasks"
		fi
	fi

	if [ ! -z "$completions"  ]; then
		if [ -n "$BASH_VERSION" ]; then
			IFS=$'\n'  #if that even necessary?
			COMPREPLY=($(compgen -W "${completions}" -- ${COMP_WORDS[COMP_CWORD]}))
		elif [ -n "$ZSH_VERSION" ]; then
			reply=( "${(ps:\n:)completions}" )
		fi
	fi
}

for tester in liblinphone_tester mediastreamer2_tester belle_sip_tester pcap_playback \
				bench mediastream msaudiocmp mtudiscover videodisplay linphone lpc2xml_test \
				lp-gen-wrappers xml2lpc_test; do
	if [ -n "$BASH_VERSION" ]; then
		complete -F _liblinphone_complete $tester
	elif [ -n "$ZSH_VERSION" ]; then
		compctl -K _liblinphone_complete $tester
	else
		echo "Your shell might be not supported! Only bash and zsh tested."
	fi
done