#!/bin/sh

# syncs files located in ~/sync with those located in the ~/sync on SERVER

SERVER=10.0.1.36
local_files=$(mktemp)
remote_files=$(mktemp)

ls ~/sync > $local_files
ssh $SERVER "ls sync" > $remote_files

local_files_missing=$(mktemp)
diff $local_files $remote_files | grep "^> " | awk '{$1=""; print $0}' | sed "s/^\ *//g" > $local_files_missing

remote_files_missing=$(mktemp)
diff $local_files $remote_files | grep "^< " | awk '{$1=""; print $0}' | sed "s/^\ *//g" > $remote_files_missing

# upload files missing on server
while IFS='' read -r LINE || [ -n "${LINE}" ]; do
    echo "${LINE} not found on skoskapet, uploading..."
    scp ~/sync/"${LINE}" $SERVER:~/sync
done < $remote_files_missing

# download missing files
while IFS='' read -r LINE || [ -n "${LINE}" ]; do
    echo "missing file ${LINE}, downloading..."
    # scp is stupid and needs all filenames with spaces to have explicit escaping
    escaped_file=$(echo "${LINE}" | sed "s/\ /\\\ /g")
    scp $SERVER:~/sync/"$escaped_file" ~/sync
done < $local_files_missing

# update modified files
for file in ~/sync/*; do
    server_file=$(mktemp)
    local_file_time=$(ls -l --time-style=+%s "$file"  | cut -d ' ' -f 6)
    remote_file_time=$(ssh $SERVER "ls -l --time-style=+%s \"$file\"  | cut -d ' ' -f 6")

    if [ "$local_file_time" -lt "$remote_file_time" ]; then
        echo "Local copy of \"$file\" is older, downloading new copy from server..."
        escaped_file=$(echo "$file" | sed "s/\ /\\\ /g")
        scp $SERVER:"$escaped_file" ~/sync
    else
        echo "Remote copy of \"$file\" is outdated, uploading new version..."
        scp "$file" $SERVER:~/sync
    fi
done

echo "all good!"