#!/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}')
            echo $image
            echo ${hash:2:2}/${hash:0:2}
            mkdir -p $(dirname "$image")/${hash:2:2}/${hash:0:2}
            ln -s $image $(dirname "$image")/${hash:2:2}/${hash:0:2}/$fileName
        done
    done
done