#!/bin/bash
# ------------------------------------------------------------------------------
# Loaders for conf and prepost 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
# ------------------------------------------------------------------------------


# ------------------------------------------------------------------------------
# Automatically load system specific configuration if file exist in the
# following order:
#   1) auto/arch.conf.sh
#   2) auto/distro.conf.sh
#   3) auto/distro-arch.conf.sh
#   4) auto/distro-version.conf.sh
#   5) auto/distro-codename.conf.sh (if sys_code defined)
#   6) auto/distro-version-arch.conf.sh
#   7) auto/distro-codename-arch.conf.sh (if sys_code defined)
load_autoconf()
{
    local prefix="$MYPATH/conf/auto"

    if [[ -e $prefix/$SYS_ARCH.conf.sh ]]; then
	. $prefix/$SYS_ARCH.conf.sh
    fi
    if [[ -e $prefix/$SYS_DIST.conf.sh ]]; then
	. $prefix/$SYS_DIST.conf.sh
    fi
    if [[ -e $prefix/$SYS_DIST-$SYS_ARCH.conf.sh ]]; then
	. $prefix/$SYS_DIST-$SYS_ARCH.conf.sh
    fi
    if [[ -e $prefix/$SYS_DIST-$SYS_VER.conf.sh ]]; then
	. $prefix/$SYS_DIST-$SYS_VER.conf.sh
    fi
    if [[ -n $SYS_CODE && -e $prefix/$SYS_DIST-$SYS_CODE.conf.sh ]]; then
	. $prefix/$SYS_DIST-$SYS_CODE.conf.sh
    fi
    if [[ -e $prefix/$SYS_DIST-$SYS_VER-$SYS_ARCH.conf.sh ]]; then
	. $prefix/$SYS_DIST-$SYS_VER-$SYS_ARCH.conf.sh
    fi
    if [[ -n $SYS_CODE && -e $prefix/$SYS_DIST-$SYS_CODE-$SYS_ARCH.conf.sh ]]; then
	. $prefix/$SYS_DIST-$SYS_CODE-$SYS_ARCH.conf.sh
    fi

    unset prefix
}
export -f load_autoconf


# ------------------------------------------------------------------------------
# Load configuration with the following priorities:
#   1) Those given on command line, if any
#   2) <workingdir>/conf/<realm>/<hostname>.conf (Hostname based and specific)
#   2) <workingdir>/conf/<hostname>.conf	 (Hostname based and specific)
#   3) <workingdir>/conf/init.conf.sh      	 (Generic default, for testing)
load_configuration()
{
    # --------------------------------------------------------------------------
    # Get list of possible files to load when REALM is not declared
    get_files()
    {
	for d in $MYPATH/conf/*; do
	    if [[ -d $d ]]; then
		find $d -maxdepth 1 -name "$HOSTNAME.conf.sh"
	    fi
	done
    }
    
    if [[ -n $CONFFILES ]]; then
	local f=
	for f in $CONFFILES; do
	    prnt I "Loading $f manually specified."
	    if [[ -s $f ]]; then
		. $f
	    else
		prnt E "The $f file doesn't exists or is empty."
		die 6 --force
	    fi
	done
	unset f
    else
	prnt I "Loading configuration..."
	if [[ -z $REALM ]]; then
	    prnt W "REALM is undeclared, trying to scan configuration subdirectories for this host..."
	    local found_realms=$(get_files)
	    case "$(echo $found_realms | wc -w)" in
		"0")
		    : # We do nothing as we'll check for other scenario
		;;
		"1")
		    export REALM="$(basename $(dirname $found_realms))"
		    local auto_realm="$REALM"
		;;
		*)
		    prnt E "More than one file correspond to that host. This is ambigous and need to be fixed."
		    prnt m "You can fix that situation with one of those actions:"
		    prnt m "\t * Declare a REALM variable with the actual domain name of the host."
		    prnt m "\t * Give manually the configuration file using the --file option."
		    prnt m "\t * Configure the domain name of the host."
		    die 20 --force
		;;
	    esac
	fi
	if [[ -e $MYPATH/conf/$REALM/$HOSTNAME.conf.sh ]]; then
	    prnt I "A specific configuration will be used."
	    local cnffile=$MYPATH/conf/$REALM/$HOSTNAME.conf.sh
	    if [[ -n $auto_realm && $REALM != $auto_realm ]]; then
		prnt E "The domain name in the confinguration file don't correspond to the detected domain through directory structure."
		die 21 --force
	    fi
	elif [[ -e $MYPATH/conf/$HOSTNAME.conf.sh ]]; then
	    prnt I "A specific configuration will be used."
	    local cnffile=$MYPATH/conf/$HOSTNAME.conf.sh
	else
	    if [[ -e $MYPATH/conf/init.conf.sh ]]; then
		prnt I "A generic configuration will be used."
		local cnffile=$MYPATH/conf/init.conf.sh
	    else
		prnt E "No configuration found, impossible to continue."
		die 6 --force
	    fi
	fi
	prnt I "Loading $cnffile ..."
	. $cnffile
    fi
}
export -f load_configuration


# ------------------------------------------------------------------------------
# Load pre and post actions for package manager
load_prepost_actions()
{
    local prepost=
    for prepost in $MYPATH/prepost.d/*.sh; do
	prnt I "Loading prepost actions in $prepost ..."
	. $prepost
    done
    unset prepost
}
export -f load_prepost_actions

# EOF