# CLI user interface
#
# Copyright (C) 2015  Patrick "P. J." McDermott
#
# 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 3 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, see <http://www.gnu.org/licenses/>.

cli_tty=''
cli_msg=''

cli_init_ui()
{
	cli_tty="$(tty)"
}

cli_exit_ui()
{
	: Nothing to do.
}

cli_dbg()
{
	: No output.
}

cli_info()
{
	local fmt="${1}"
	shift 1

	printf "${fmt}\n" "${@}" >"${cli_tty}"
}

cli_warn()
{
	local fmt="${1}"
	shift 1

	printf "Warning: ${fmt}\n" "${@}" >"${cli_tty}"
}

cli_err()
{
	local fmt="${1}"
	shift 1

	printf "Error: ${fmt}\n" "${@}" >"${cli_tty}"
}

cli_message()
{
	local msg="${1}"
	shift 1

	printf '%s\n\n' "${msg}" >"${cli_tty}"

	return 0
}

cli_show_menu()
{
	local title="${1}"
	shift 1
	local i=
	local l=
	local label=

	printf '%s\n' "${title}" >"${cli_tty}"
	{ printf '%s\n' "${title}" | sed 's/./-/g'; } >"${cli_tty}"

	while :; do
		printf '\n' >"${cli_tty}"
		i=0
		l=${#}
		for label in "${@}"; do
			i=$(($i + 1))
			printf '  %4d: %s\n' "${i}" "${label}" >"${cli_tty}"
		done
		printf '\n> ' >"${cli_tty}"
		if ! read -r i <"${cli_tty}"; then
			continue
		fi
		case "${i}" in
			*[!0-9]* | '')
				continue
				;;
		esac
		if [ ${i} -le 0 ] || [ ${i} -gt ${l} ]; then
			continue
		fi
		printf '\n' >"${cli_tty}"
		i=$(($i - 1))
		printf '%d' "${i}"
		return 0
	done
}

cli_show_prompt()
{
	local title="${1}"
	local input="${2}"
	local len=${3}
	shift 3
	local input=''

	printf '%s\n' "${title}" >"${cli_tty}"
	{ printf '%s\n' "${title}" | sed 's/./-/g'; } >"${cli_tty}"

	if [ "x${input}" = 'x' ]; then
		printf '\n> ' >"${cli_tty}"
	else
		printf '\n[%s] > ' "${input}" >"${cli_tty}"
	fi
	read -r input
	printf '\n' >"${cli_tty}"
	printf '%s' "${input}"
	return 0
}