#!/bin/bash
#
# .---.                  .              .
# |                      |              |
# |--- .--. .-.  .-.  .-.|  .-. .--.--. |.-.  .-. .--.  .-.
# |    |   (.-' (.-' (   | (   )|  |  | |   )(   )|  | (.-'
# '    '     --'  --'  -' -  -' '  '   -' -'   -' '   -  --'
#
#                    Freedom in the Cloud
#
# Functions for selecting which apps to install or remove
#
# License
# =======
#
# Copyright (C) 2015-2016 Bob Mottram <bob@robotics.uk.to>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero 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 Affero General Public License for more details.
#
# You should have received a copy of the GNU Affero General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

# Array containing names of available apps
APPS_AVAILABLE=()

# Array containing 1 or 0 indicating installed apps
APPS_INSTALLED=()

# Apps selected with checklist
APPS_CHOSEN=()

# A list of the names of installed apps
APPS_INSTALLED_NAMES=()

function item_in_array {
	local e
	for e in "${@:2}"; do [[ "$e" == "$1" ]] && return 0; done
	return 1
}

function app_is_installed {
	app_name="$1"
	if [ ! -f $COMPLETION_FILE ]; then
		echo "0"
		return
	fi

	if ! grep -Fxq "install_${app_name}" $COMPLETION_FILE; then
		echo "0"
	else
		echo "1"
	fi
}

function get_apps_installed {
	for a in "${APPS_AVAILABLE[@]}"
	do
		APPS_INSTALLED+=("$(app_is_installed $a)")
	done
}

function get_apps_installed_names {
	APPS_INSTALLED_NAMES=()
	for a in "${APPS_AVAILABLE[@]}"
	do
		if [[ $(app_is_installed $a) == "1" ]]; then
			APPS_INSTALLED_NAMES+=("$a")
		fi
	done
}

function detect_apps {
	FILES=/usr/share/${PROJECT_NAME}/apps/${PROJECT_NAME}-app-*

	APPS_AVAILABLE=()
	APPS_CHOSEN=()

	# for all the app scripts
	for filename in $FILES
	do
		app_name=$(echo "${filename}" | awk -F '-app-' '{print $2}')
		if [[ $(item_in_array ${app_name} ${APPS_AVAILABLE[@]}) != 0 ]]; then
			APPS_AVAILABLE+=("${app_name}")
			APPS_CHOSEN+=("0")
		fi
	done

	function_check get_apps_installed
	get_apps_installed
	get_apps_installed_names
}

# creates the APPS_AVAILABLE and APPS_CHOSEN arrays based on
# the given variant name
function choose_apps_for_variant {
	variant_name="$1"

	FILES=/usr/share/${PROJECT_NAME}/apps/${PROJECT_NAME}-app-*

	APPS_AVAILABLE=()
	APPS_CHOSEN=()

	# for all the app scripts
	for filename in $FILES
	do
		app_name=$(echo "${filename}" | awk -F '-app-' '{print $2}')
		if [[ $(item_in_array ${app_name} ${APPS_AVAILABLE[@]}) != 0 ]]; then
			APPS_AVAILABLE+=("${app_name}")

			if grep -q "VARIANTS=" ${filename}; then
				variants_list="$(cat ${filename} | grep "VARIANTS=" | awk -F '=' '{print $2}' | awk -F "'" '{print $2}')"
				if [[ "${variants_list}" == 'all' || "${variants_list}" == "$variant_name "* || "${variants_list}" == *" $variant_name "* || "${variants_list}" == *" $variant_name" ]]; then
					APPS_CHOSEN+=("1")
				else
					APPS_CHOSEN+=("0")
				fi
			else
				APPS_CHOSEN+=("0")
			fi

		fi
	done

	function_check get_apps_installed
	get_apps_installed
}

function list_chosen_apps {
	app_index=0
	for a in "${APPS_AVAILABLE[@]}"
	do
		if [[ ${APPS_CHOSEN[$app_index]} == "1" ]]; then
			echo $"${a}"
		fi
		app_index=$[app_index+1]
	done
}

function remove_apps {
	app_index=0
	for a in "${APPS_AVAILABLE[@]}"
	do
		if [[ ${APPS_INSTALLED[$app_index]} == "1" ]]; then
			if [[ ${APPS_CHOSEN[$app_index]} == "0" ]]; then
				echo $"Removing application: ${a}"
				remove_${a}
				echo $"${a} was removed"
			fi
		fi
		app_index=$[app_index+1]
	done
}

function install_apps {
	app_index=0
	for a in "${APPS_AVAILABLE[@]}"
	do
		if [[ ${APPS_INSTALLED[$app_index]} == "0" ]]; then
			if [[ ${APPS_CHOSEN[$app_index]} == "1" ]]; then
				echo $"Installing application: ${a}"
				install_${a}
				echo $"${a} was installed"
			fi
		fi
		app_index=$[app_index+1]
	done
}

# NOTE: deliberately no exit 0