#!/bin/bash

# Configuration
URL="https://git.1337733.xyz/martin/sshconfig/raw/branch/main/authorized_keys"
LOCAL_FILE="$HOME/.ssh/authorized_keys"

# Ensure .ssh exists
mkdir -p ~/.ssh && chmod 700 ~/.ssh
touch "$LOCAL_FILE"

echo "Checking for new keys..."

# 1. Download keys to a temporary file
temp_keys=$(mktemp)
curl -s "$URL" > "$temp_keys"

# 2. Add a newline to the local file to prevent "glued" keys
echo "" >> "$LOCAL_FILE"

# 3. Combine files and remove duplicates while keeping order
# This 'awk' magic keeps the first occurrence of every line and ignores the rest.
# It preserves your comments and their relationship to the keys.
cp "$LOCAL_FILE" "${LOCAL_FILE}.bak"
cat "$LOCAL_FILE" "$temp_keys" | awk '!visited[$0]++' > "${LOCAL_FILE}.tmp" && mv "${LOCAL_FILE}.tmp" "$LOCAL_FILE"

# 4. Final Cleanup
chmod 600 "$LOCAL_FILE"
rm "$temp_keys"

echo "Done! New keys (if any) have been added. A backup was created at authorized_keys.bak."