#!/bin/bash

for collection in */ ; do
    for size in "$collection"*/ ; do
        for image in "$size"* ; do
            fileName=$(basename "$image")
            imageName="${fileName%.*}"
            hash=$(echo -n "$imageName" | sha1sum | awk '{print $1}')
            path=$(dirname "$image")/${hash:2:2}/${hash:0:2}
            mkdir -p $path
            mv $image $path/$fileName
            ln -s $path/$fileName $fileName
        done
    done
done