#!/bin/sh

set -e

backup() {
    TMP_DFILE="$(mktemp)"
    dconf dump "$1" > "$TMP_DFILE"

    blist_ini "${TMP_DFILE}" "${2}"
    clean_nlines_ini "${TMP_DFILE}"

    cat "$TMP_DFILE" > "$3"
    rm "$TMP_DFILE"
}

apply() {
    if [ -f "$2" ]; then
        < "$2" dconf load "$1"
    else
        echo "The file \"${2}\" does not exist. Aborting..."
        exit 1
    fi
}

err_var_noset() {
    echo "Variable $1 is not set. Aborting..." && exit 1
}

if [ $# -eq 0 ]; then
    echo "No arguments provided: use \"-h\" for help. Aborting..."
    exit 1
fi

if [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
    echo "usage: dconfman [-h] <-b|-a> dirPath

Backup selected dconf database settings in a reproducible, stable and clean
file; perfect for version control systems and keep track to only the relevant
settings that truly matter, keeping out the noise.

required arguments:
  -h, --help            show this help message and exit
  -b, --backup          backup dconf database settings
  -a. --apply           apply backupped settings to dconf database
  
example:
dconfman --backup .gedit
dconfman --apply .gedit"
    exit 0
fi

if [ ! $# -eq 2 ]; then
    echo "Exactly two (2) arguments are needed. Aborting..."
    exit 1
fi

if [ -f "$2/.dotenv" ]; then
    . "$2/.dotenv"
else
    echo "The \"$2/.dotenv\" file is not present. Aborting..."
    exit 1
fi

if [ -n "$KIND" ]; then
    if [ "$KIND" != "dconf" ]; then
        echo "This is a $KIND, not a dconf dir."
        exit 1
    fi
else
    echo "No \"KIND\" variable defined in \"$2/.dotenv\". Aborting..."
    exit 1
fi

[ -z "$DOTSCRIPTS_D" ] && err_var_noset "DOTSCRIPTS_D"

[ -z "$SCRIPTS_LIST" ] && err_var_noset "SCRIPTS_LIST"
[ -z "$DPATH" ] && err_var_noset "DPATH"
[ -z "$DLIST_FILE" ] && err_var_noset "DLIST_FILE"
[ -z "$INI_DST" ] && err_var_noset "INI_DST"

_IFS="$IFS"
IFS=","
for SCRIPT in $SCRIPTS_LIST; do
    . "${DOTSCRIPTS_D}/${SCRIPT}"
done
IFS="$_IFS"

case $1 in
    "--backup"|"-b")
        echo "Backing up \"$DPATH\" in \"$2/$INI_DST\" file..."
        backup "$DPATH" "$2/$DLIST_FILE" "$2/$INI_DST"
    ;;
    "--apply"|"-a")
        echo "Applying \"$2/$INI_DST\" to \"$DPATH\"..."
        apply "$DPATH" "$2/$INI_DST"
    ;;
    *)
        echo "Unknown parameter: use \"-h\" for help. Aborting..."
        exit 1
    ;;
esac