# Relational pipes
# Copyright © 2021 František Kučera (Frantovo.cz, GlobalCode.info)
#
# 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, version 3 of the License.
#
# 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, see <http://www.gnu.org/licenses/>.

_relpipe_tr_grep_completion() {
	local w0 w1 w2 w3

	COMPREPLY=()
	w0=${COMP_WORDS[COMP_CWORD]}
	w1=${COMP_WORDS[COMP_CWORD-1]}
	w2=${COMP_WORDS[COMP_CWORD-2]}
	w3=${COMP_WORDS[COMP_CWORD-3]}

	BOOLEAN_VALUES=(
		"true"
		"false"
	)

	ENTITY_VALUES=(
		"relation"
		"attribute"
		"value"
	)

	if   [[ "$w1" == "--relation"                      && "x$w0" == "x" ]];    then COMPREPLY=("'.*'")
	elif [[ "$w1" == "--attribute"                     && "x$w0" == "x" ]];    then COMPREPLY=("'.*'")
	elif [[ "$w1" == "--value"                         && "x$w0" == "x" ]];    then COMPREPLY=("''")
	elif [[ "$w1" == "--case-sensitive"                                 ]];    then COMPREPLY=($(compgen -W "${ENTITY_VALUES[*]}"  -- "$w0"))
	elif [[ "$w2" == "--case-sensitive"                                 ]];    then COMPREPLY=($(compgen -W "${BOOLEAN_VALUES[*]}" -- "$w0"))
	elif [[ "$w1" == "--invert-match"                                   ]];    then COMPREPLY=($(compgen -W "${ENTITY_VALUES[*]}"  -- "$w0"))
	elif [[ "$w2" == "--invert-match"                                   ]];    then COMPREPLY=($(compgen -W "${BOOLEAN_VALUES[*]}" -- "$w0"))
	else
		OPTIONS=(
			"--relation"
			"--attribute"
			"--value"
			"--case-sensitive"
			"--invert-match"
		)
		COMPREPLY=($(compgen -W "${OPTIONS[*]}" -- "$w0"))
	fi
}

complete -F _relpipe_tr_grep_completion relpipe-tr-grep