#!/bin/bash
set -e

mkdir -p static-tmp
cp -a static/* static-tmp/

declare -a replacements

while IFS= read -r file; do
    [ -f "$file" ] || continue
    hash=$(sha256sum "$file" | head -c 8)
    sri_hash=sha256-$(openssl dgst -sha256 -binary "$file" | openssl base64 -A)
    dest="$(dirname "$file")/$hash.$(basename "$file")"
    rel_path="${file#*/}"
    dest_path="${dest#*/}"

    if [[ "$file" == *.css ]]; then
        replacements+=("s@{{css|/$rel_path}}@<link rel=\"stylesheet\" href=\"/$dest_path\" integrity=\"$sri_hash\"/>@g")
    elif [[ "$file" == *.js ]]; then
        replacements+=("s@{{js|/$rel_path}}@<script type=\"module\" src=\"/$dest_path\" integrity=\"$sri_hash\"></script>@g")
    fi

    mv "$file" "$dest"
    replacements+=("s@{{integrity|/$rel_path}}@$sri_hash@g")
    replacements+=("s@{{path|/$rel_path}}@/$dest_path@g")
done < <(find static-tmp -type f \( -name "*.css" -o -name "*.js" \))

while IFS= read -r htmlfile; do
    for rep in "${replacements[@]}"; do
        sed -i "$rep" "$htmlfile"
    done
done < <(find static-tmp -type f -name "*.html")

rm -rf static
mv static-tmp static