#!/bin/bash
NEW_TYPE="png"
TYPE_ARR=("jp*g" "tif" "webp" "png")
file=""
folder=""
usage(){
	printf "Usage:
	-f <file>\tConvert single File
	-d <dir>\tConvert all files in Dir
	-t <type>\tSet new Type
	-h\t\tDisplay this\n"
}

img_convert() {
	IMG="$1"
	IMG_NEW="$IMG"
	for type in ${TYPE_ARR[@]}; do
		IMG_NEW="$(echo ${IMG_NEW} | sed 's/\.'"${type}"'/.'"${NEW_TYPE}"'/g')"
	done
	if [ ! -f "${IMG}" ]; then
		echo "${IMG} not found"
		return
	fi
	if [ "${IMG}" == "${IMG_NEW}" ]; then
		echo "${IMG} and ${IMG_NEW} are the same"
		return
	fi
	echo "Convert ${IMG} ${IMG_NEW}"
	convert -quiet "${IMG}" "${IMG_NEW}" >> /dev/null
	rm "${IMG}"
}

folder_magic(){
	IMG_FOLDER="$1"
	echo "Convert Imgs in ${IMG_FOLDER}"
	IMG_ARR=()
	IMG_ARR_NEW=()
	
	IFS=$'\n'; set -f
	for type in ${TYPE_ARR[@]}; do
		if [[ "${type}" != "${NEW_TYPE}" ]]; then
			IMG_ARR+=($(find ${IMG_FOLDER} -name "*${type}"))
			IMG_ARR_NEW+=($(find ${IMG_FOLDER} -name "*${type}" | sed 's/\.'"${type}"'/.'"${NEW_TYPE}"'/g'))
		fi
	done
	for ((i=0;i<${#IMG_ARR[@]};i++)); do
		echo "Convert ${IMG_ARR[$i]} ${IMG_ARR_NEW[$i]}"
		convert -quiet "${IMG_ARR[$i]}" "${IMG_ARR_NEW[$i]}" >> /dev/null
		rm "${IMG_ARR[$i]}"
	done
}

get_config() {
if [ $# -eq 0 ] || [  ${1:0:1} != - ]; then 
	echo "Too few Arguments"
	usage
	exit
fi
while [[ ${1:0:1} == - ]]; do
	echo "Param: $1"
	[[ $1 == -h ]] && {
			usage
			exit
		};
	[[ $1 == -f ]] && {
			if [ $# -lt 2 ]; then
				echo "Too few Arguments"
				usage
				exit
			fi
			file="$2"; 
			shift 2; 
			continue; 
        }
	[[ $1 == -d ]] && {
			if [ $# -lt 2 ]; then
				echo "Too few Arguments"
				usage
				exit
			fi
			folder="$2"; 
			shift 2; 
			continue; 
        }
	[[ $1 == -t ]] && {
			if [ $# -lt 2 ]; then
				echo "Too few Arguments"
				usage
				exit
			fi
			NEW_TYPE="$2"; 
			shift 2; 
			continue; 
        }
	echo "Parameter $1 discarded"
	shift 1;
done
}
get_config "$@"
if [[ "${file}" != "" ]]; then
	img_convert "${file}"
fi
if [[ "${folder}" != "" ]]; then
	folder_magic "${folder}"
fi