use clap::Parser;

mod rewriter;

use env_logger::Env;
use log::info;
use rewriter::Rewriter;

/// Implements a HTTP server which allows clients to 'register'
/// themselves. Their IP address will be used to replace a
/// needle in a set of config files. This is intended to be
/// used as a low-cost way of enabling Kubernetes ingress
/// using nginx running on a machine that has a public port.
/// 
/// The needle is expected to be a dummy IP address; something
/// fairly unique. The goal is to replace nginx files, where
/// we often repeat lines if we want nginx to load balance between
/// multiple destination IPs.
#[derive(Parser, Debug)]
#[command(version, about, long_about = None)]
struct Args {
    /// The needle that will be replaced. Anytime a line
    /// is encountered with this needle, the line is dropped
    /// and instead N lines (one per replacement) is added to
    /// the output.
    #[arg(short, long)]
    rewrite_string: String,

    /// The folder which contains the templates that
    /// will be be searched for the needle.
    #[arg(short, long)]
    source_folder: String,

    /// Where to write the replaced lines.
    #[arg(short, long)]
    dest_folder: String,
}

fn main() {
    // Log info and above by default
    env_logger::Builder::from_env(Env::default().default_filter_or("info")).init();
    let args = Args::parse();

    let mut rewriter = Rewriter::new(args.rewrite_string);

    rewriter.add_replacement(String::from("abc"));
    rewriter
        .rewrite_folder(&args.source_folder, &args.dest_folder)
        .unwrap();
    info!("Finished writing new config to {}", args.dest_folder);
}