# 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_in_asn1_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"
	)

	# TODO: introspection: after moving to alt2xml the available options and their values should be provided by the parser

	PARSER_OPTIONS=(
		"encoding"
		"parse-encapsulated"
		"bit-string-symbol-0"
		"bit-string-symbol-1"
	);

	ENCODINGS=(
		"BER"
		"DER"
		"CER"
		"PER"
		"XER"
		"ASN.1"
	);

	MODES=(
		"relpipe"
		"freeform"
	);

	if   [[ "$w1" == "--relation"                      && "x$w0" == "x" ]];    then COMPREPLY=("''")
	elif [[ "$w1" == "--mode"                                           ]];    then COMPREPLY=($(compgen -W "${MODES[*]}" -- "$w0"))
	elif [[ "$w1" == "--parser-option"                                  ]];    then COMPREPLY=($(compgen -W "${PARSER_OPTIONS[*]}" -- "$w0"))
	elif [[ "$w2" == "--parser-option" && "$w1" == "encoding"                                 ]];    then COMPREPLY=($(compgen -W "${ENCODINGS[*]}" -- "$w0"))
	elif [[ "$w2" == "--parser-option" && "$w1" == "parse-encapsulated"                       ]];    then COMPREPLY=($(compgen -W "${BOOLEAN_VALUES[*]}" -- "$w0"))
	elif [[ "$w2" == "--parser-option" && "$w1" == "bit-string-symbol-0"     && "x$w0" == "x" ]];    then COMPREPLY=("'0'")
	elif [[ "$w2" == "--parser-option" && "$w1" == "bit-string-symbol-1"     && "x$w0" == "x" ]];    then COMPREPLY=("'1'")
	else
		OPTIONS=(
			"--relation"
			"--mode"
			"--parser-option"
		)
		COMPREPLY=($(compgen -W "${OPTIONS[*]}" -- "$w0"))
	fi
}

complete -F _relpipe_in_asn1_completion relpipe-in-asn1