#!/usr/bin/env bash

# Copyright (C) 2017 Andrew Robbins <contact@andrewrobbins.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, 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/>.

dependencies_print() {
	local distro="$1"
	shift

	if [[ "$distro" == 'parabola' ]]; then
		printf '%s\n' 'Enable the multilib repository in /etc/pacman.conf'
		printf '\n%s\n' 'Then, run the following command as root:'
		printf '\n%s%s\n' 'pacman -S --needed ' "$*"
	else
		printf '%s\n' 'You will need to run the following command as root:'
		printf '\n%s%s\n' 'apt-get -y install ' "$*"
	fi
}

dependencies_host_supported() {
	local distro="$1"
	local arch="$2"

	dependencies_distro_supported "$distro" || return
	dependencies_arch_supported "$distro" "$arch" || return
}

dependencies_arch_supported() {
	local distro="$1"
	local arch="$2"

	local tool_path="$(tool_path "$tool")"
	local distro_dir="$tool_path/$CONFIGS/$distro"

	if ! [[ -d "$distro_dir/$arch" ]]; then
		printf '%s\n'  "Architecture \"$arch\" is not supported" 1>&2

		return 1
	fi
}

dependencies_distro_supported() {
	local distro="$1"

	local tool_path="$(tool_path "$tool")"
	local targets_path="$tool_path/$CONFIGS/$TARGETS"

	local -a targets_list
	mapfile -t targets_list < "$targets_path"

	# Necessary to properly format the string for extglob use below
	IFS='|' eval 'local distro_list="${targets_list[*]}"'

	if [[ "$distro" != @($distro_list) ]]; then
		printf '%s'  "Argument \"$distro\" is not supported.  " 1>&2
		printf '%s\n'  'Check spelling?' 1>&2

		usage
		return 1
	fi
}