#!/bin/bash

## Checks given folder for files with certain extensions. Subfolders are checked recursively. 
## $1 Folder to check.
## $2 space separated list of extensions to check for. e.g.: "*.jpg *.JPG *.mp4 *.MP4".
## returns Count of files found with the desired extension.
function check_folder() {
	local _folder=$1;
	local _extensions=$2;
	local _file_count=0;
	if [ -d "$_folder" ]; then	# is a folder
		local _item="";
		local _fc=${#Files_N_Paths[@]};
		pushd "$_folder" 1>/dev/null;
		for _item in ${_extensions}; do # lookup all files with the desired extensions
			if [[ -f "$_item" ]]; then # is a file
				Files_N_Paths[$_FC]="$(pwd)/$_item";
 				((_fc+=1));
 				((_file_count+=1));
			fi
		done
		# check subfolders if exist
		local _sub_folders="$(/usr/bin/ls . 2>/dev/null)";
		local _cnt=0;
		for _sub_item in ${_sub_folders}; do
			if [[ -d "$_sub_item" ]]; then
				check_folder "$_sub_item" "$_extensions";
				_cnt=$?
				((_file_count+=_cnt));
			fi
		done
		popd 1>/dev/null;
	fi
	return $_file_count
}

## Test the check_folder() function with local test folder and images.
function test() {
	local _my_folder="./cffe_test";
	check_folder $_my_folder "*.jpg *.JPG"  # space separated list for multiple extensions!
	local _files_count=$?
	echo "Found $_files_count files in folder $_my_folder, length of files array is ${#Files_N_Paths[*]}.";
	for ((_fc=0;_fc<${#Files_N_Paths[*]};_fc++)); do
		echo "$_fc : ${Files_N_Paths[$_fc]}";
	done
}


declare -A Files_N_Paths;
test