#!/bin/env bash
# ------------------------------------------------------------------------------
# Main program functions
# This file is part of the init.sh project
# Copyright (c) 2019-2022 Geoffray Levasseur <fatalerrors@geoffray-levasseur.org>
# ------------------------------------------------------------------------------
# This file is distributed under 3-clause BSD license.
# The complete license agreement can be obtained at:
# https://opensource.org/licenses/BSD-3-Clause
# ------------------------------------------------------------------------------


# ------------------------------------------------------------------------------
# Read command line and set appropriate vars. Some basic checks can trigger
# errors with immediate exit.
read_commandline()
{
    # Processing command line options
    local opt=
    local params=''
    params=$(getopt -n init.sh -o hvm:cjkrRDoPl:f:s \
	     --long help,version,module:,check-only,jump,keep-going,resume,no-root-check,no-deps,offline,no-proxy,logfile:,file:,shell,chroot,cron \
	     -- "$@")
    eval set -- "$params"
    while true; do
	case $1 in
	    "-h"|"--help")
		disp_help
		shift
		exit 0
		;;
	    "-v"|"--version")
		show_version
		shift
		exit 0
		;;
	    "-m"|"--module")
		if [[ -z $MANUAL_MODULE_LIST ]]; then
		    export MANUAL_MODULE_LIST="$2"
		else
		    prnt E "A module list have already been given!"
		    prnt E "Commande line only tolerate one --module parameter."
		    die 1 --force
		fi
		shift 2
		;;
	    "-c"|"--check-only")
		export CHECK_ONLY=true
		shift
		;;
	    "-j"|"--jump")
		export JUMP=true
		shift
		;;
	    "-k"|"--keep-going")
		export KEEPGOING=true
		shift
		;;
	    "-r"|"--resume")
		if [[ -s $STAGE_FILE ]]; then
		    export RESUME=true
		else
		    prnt E "The status file doesn't exists or is empty!"
		    prnt E "Without it, resuming is impossible."
		    die 17 --force
		fi
		shift
		;;
	    "-R"|"--no-root-check")
		export NO_ROOT_CHECK=true
		shift
		;;
	    "-D"|"--no-deps")
		export NO_DEPS=true
		shift
		;;
	    "-o"|"--offline")
		export OFFLINE=true
		shift
		;;
	    "-P"|"--no-proxy")
		export NO_PROXY=true
		shift
		;;
	    "-l"|"--logfile")
		if [[ -z $NEW_LOGFILE ]]; then
		    export NEW_LOGFILE=$2
		else
		    prnt E "Impossible to specify several log files."
		    die 1 --force
		fi
		shift 2
		;;
	    "-f"|"--file")
		export CONFFILES="$CONFFILES $2"
		shift 2
		;;
	    "-s"|"--shell")
		export RUN_SHELL=true
		shift
		;;
	    "--chroot")
		if [[ -z $CHROOT_PATH ]]; then
		    export CHROOT_PATH=$2
		else
		    prnt E "A chroot path have already been given."
		    die 1 --force
		fi
		shift 2
		;;
	    "--cron")
		export CRON_MODE=true
		shift
		;;
	    --)
		shift
		break
		;;
	    *)
		if [[ -n $1 ]]; then
                    prnt E "Unknow parameter \"$1\" !"
                    die 1
                fi
                break
		;;
	esac
    done
    unset opt
}
export -f read_commandline


# ------------------------------------------------------------------------------
# Do deeper command line analysis to detect unconsistancies
process_commandline_and_vars()
{
    # Check unconsistant parameters
    if [[ $CHECK_ONLY == true ]]; then
	if [[ $JUMP == true ]]; then
	    prnt E "The options --check-only and --jump are mutually exclusive!"
	    die 1 --force
	fi
	if [[ $KEEPGOING == true ]]; then
	    prnt E "The options --keep-going and --check-only are not compatible!"
	    die 1 --force
	fi
    fi
    if [[ $RESUME == true ]]; then
	if [[ $CHECK_ONLY == true ]]; then
	    prnt E "Resuming doesn't make sense with --check-only."
	    die 1 --force
	fi
	if [[ -n $MANUAL_MODULE_LIST ]]; then
	    prnt E "Resume mode can't work with a manual module list."
	    die 1 --force
	fi
    fi

    if [[ $CRON_MODE == true ]]; then
	if [[ $CHECK_ONLY == true || $JUMP == true ]]; then
	    prnt E "Some parameters are incompatible with cron mode."
	    die 16 --force
	fi
    fi

    # Configure module list
    if [[ -n $MANUAL_MODULE_LIST ]]; then
	prnt W "A manual module list will be used:"
	export MODULE_LIST=${MANUAL_MODULE_LIST//,/ }
        prnt m " * $MODULE_LIST"
    fi

    # Check for module list exis<tance and basic syntax
    if [[ -n $MODULE_LIST ]]; then
	for mod in $MODULE_LIST; do
	    if [[ $mod =~ ['-!@#$%\&*=+'] ]]; then
		prnt E "The module \"$mod\" contains a forbidden character in its name."
		die 5
	    fi
	    if [[ ! -s "modules/$mod.sh" ]]; then
		prnt E "The asked module \"$mod\", doesn't have any module file or module file is empty."
		die 18
	    fi
	done
    elif [[ $RUN_SHELL != "true" ]]; then
	prnt E "No module to execute!"
	die 5
    fi
}
export -f process_commandline_and_vars

# EOF