#!/command/with-contenv bash
# Generate chrony configuration from add-on options

CONFIG_FILE="/etc/chrony/chrony.conf"
OPTIONS_FILE="/data/options.json"

echo "[INFO] Generating Chrony configuration..."

# Create config directory
mkdir -p /etc/chrony /var/lib/chrony /var/log/chrony

# Start with base config
cat > "$CONFIG_FILE" << 'EOF'
# Chrony configuration - generated by Home Assistant add-on
driftfile /var/lib/chrony/chrony.drift
makestep 1.0 3
rtcsync
logdir /var/log/chrony
EOF

# Parse options.json with jq
if [ -f "$OPTIONS_FILE" ]; then
    # Add NTP pools
    pool_count=$(jq '.ntp_pools | length' "$OPTIONS_FILE")
    for i in $(seq 0 $((pool_count - 1))); do
        pool_addr=$(jq -r ".ntp_pools[$i].pool" "$OPTIONS_FILE")
        iburst=$(jq -r ".ntp_pools[$i].iburst" "$OPTIONS_FILE")
        maxsources=$(jq -r ".ntp_pools[$i].maxsources" "$OPTIONS_FILE")

        pool_line="pool ${pool_addr}"
        [ "$iburst" = "true" ] && pool_line="${pool_line} iburst"
        [ "$maxsources" != "null" ] && pool_line="${pool_line} maxsources ${maxsources}"

        echo "$pool_line" >> "$CONFIG_FILE"
        echo "[INFO] Added NTP pool: ${pool_addr}"
    done

    # Add NTP servers
    server_count=$(jq '.ntp_servers | length' "$OPTIONS_FILE")
    for i in $(seq 0 $((server_count - 1))); do
        server_addr=$(jq -r ".ntp_servers[$i].server" "$OPTIONS_FILE")
        iburst=$(jq -r ".ntp_servers[$i].iburst" "$OPTIONS_FILE")

        if [ "$iburst" = "true" ]; then
            echo "server ${server_addr} iburst" >> "$CONFIG_FILE"
        else
            echo "server ${server_addr}" >> "$CONFIG_FILE"
        fi
        echo "[INFO] Added NTP server: ${server_addr}"
    done

    # Configure as NTP server if enabled
    enable_server=$(jq -r '.enable_ntp_server' "$OPTIONS_FILE")
    if [ "$enable_server" = "true" ]; then
        echo "[INFO] NTP server mode enabled"

        # Add allowed client networks
        for network in $(jq -r '.allow_clients[]' "$OPTIONS_FILE"); do
            echo "allow ${network}" >> "$CONFIG_FILE"
            echo "[INFO] Allowing clients from: ${network}"
        done
    fi

    # Set logging
    detailed_logging=$(jq -r '.detailed_logging' "$OPTIONS_FILE")
    if [ "$detailed_logging" = "true" ]; then
        echo "log tracking measurements statistics" >> "$CONFIG_FILE"
        echo "[INFO] Detailed logging enabled"
    else
        echo "log tracking" >> "$CONFIG_FILE"
    fi
fi

echo "[INFO] Chrony configuration generated successfully"

# Start chrony in foreground
exec chronyd -d -f "$CONFIG_FILE"