#!/usr/bin/env bash

DEFPATH="$HOME/Pictures/defaultWall"
BINNAME="setwall"

function unsetwall() {
    rm ${DEFPATH}.*
}

function setwall() {
    feh --bg-fill $1
}

function help() {
    echo "Wallpaper mangement script"
    echo
    echo "Syntax: ${BINNAME} OPTIONS"
    echo "options:"
    echo "  -r, --refresh               reapply the wallpaper"
    echo "  -u, --unset                 unset the current wallpaper"
    echo "  -s PATH, --set PATH         set a new default wallpaper"
    echo "  -p PATH, --preview PATH     set a wallpaper"
}

if [[ $# -eq 0 ]]
then
    echo "${BINNAME}: no arguments given" 1>&2
    help
    exit 1
fi

while [[ $# -gt 0 ]]
do
    key="$1"
    case $key in
        -r|--refresh)
            setwall "${DEFPATH}.*"
            shift
            ;;
        -u|--unset)
            unsetwall
            shift
            ;;
        -s|--set)
            unsetwall
            EXTENSION=`echo "$2" | cut -d'.' -f2`
            ln -s $(pwd)/$2 "$DEFPATH.$EXTENSION"
            setwall "${DEFPATH}.*"
            shift
            shift
            ;;
        -p|--preview)
            setwall "$2"
            shift
            shift
            ;;
        -h|--help)
            help
            shift
            exit 0
            ;;
        *)
            echo "${BINNAME}: unknown option $key" 1>&2
            exit 1
    esac
done