// This seems like probably not the best way to do this, but it works.
#[path = "../client_lib.rs"]
mod client_lib;
use client_lib::*;

use curve25519_dalek::scalar::Scalar;
use getopts::Options;
use lox::bridge_table::BridgeLine;
use lox::IssuerPubKey;
use serde::Serialize;
use std::env::args;
use std::fs::File;
use std::io::Write;
use std::path::Path;

// Prints the argument details for this program
fn print_usage(program: &str, opts: Options) {
    let brief = format!("Usage: {} [options]", program);
    print!("{}", opts.usage(&brief));
}

// Helper function to save serializable objects to files
fn save_object<T: Serialize>(obj: T, filename: &str) {
    let mut outfile = File::create(filename).expect(&("Failed to create ".to_string() + filename));
    write!(outfile, "{}", serde_json::to_string(&obj).unwrap())
        .expect(&("Failed to write to ".to_string() + filename));
}

#[tokio::main]
async fn main() {
    let args: Vec<String> = args().collect();

    let mut opts = Options::new();
    opts.optflag("h", "help", "print this help menu");
    opts.optflag("L", "level-up", "increase trust level");
    opts.optflag("N", "new-lox-cred", "get a new Lox Credential");
    opts.optopt(
        "",
        "server",
        "Lox Auth server address [http://localhost:8001]",
        "ADDR",
    );

    let matches = match opts.parse(&args[1..]) {
        Ok(m) => m,
        Err(f) => {
            panic!("{}", f.to_string())
        }
    };

    if matches.opt_present("h") {
        print_usage(&args[0], opts);
        return;
    }

    let server_addr = if matches.opt_present("server") {
        matches.opt_str("server").unwrap()
    } else {
        "http://localhost:8001".to_string()
    };

    // Get Lox Authority public keys
    // TODO: Make this filename configurable
    let lox_auth_pubkeys_filename = "lox_auth_pubkeys.json";

    let lox_auth_pubkeys: Vec<IssuerPubKey> = if Path::new(lox_auth_pubkeys_filename).exists() {
        // read in file
        let lox_auth_pubkeys_infile = File::open(lox_auth_pubkeys_filename).unwrap();
        serde_json::from_reader(lox_auth_pubkeys_infile).unwrap()
    } else {
        // download from Lox Auth
        let pubkeys = get_lox_auth_keys(&server_addr).await;
        // save to file for next time
        save_object(&pubkeys, &lox_auth_pubkeys_filename);
        pubkeys
    };

    // Get Lox Credential and BridgeLine
    let lox_cred_filename = "lox_cred.json";
    let bridgeline_filename = "bridgeline.json";
    let (lox_cred, bridgeline) = if matches.opt_present("N")
        || !Path::new(lox_cred_filename).exists()
        || !Path::new(bridgeline_filename).exists()
    {
        // get new Lox Credential
        let open_invite = get_open_invitation(&server_addr).await;
        let (cred, bl) =
            get_lox_credential(&server_addr, &open_invite, get_lox_pub(&lox_auth_pubkeys)).await;

        // save to files for next time
        save_object(&cred, &lox_cred_filename);
        save_object(&bl, &bridgeline_filename);
        (cred, bl)
    } else {
        // Read existing Lox Credential and BridgeLine from files
        let cred = serde_json::from_reader(File::open(lox_cred_filename).unwrap()).unwrap();
        let bl = serde_json::from_reader(File::open(bridgeline_filename).unwrap()).unwrap();
        (cred, bl)
    };

    if matches.opt_present("L") {
        // If trust level is 0, do trust promotion, otherwise level up.
        if lox_cred.trust_level == Scalar::zero() {
            let migration_cred =
                trust_promotion(&server_addr, &lox_cred, get_lox_pub(&lox_auth_pubkeys)).await;
            let cred = trust_migration(
                &server_addr,
                &lox_cred,
                &migration_cred,
                get_lox_pub(&lox_auth_pubkeys),
                get_migration_pub(&lox_auth_pubkeys),
            )
            .await;
        } else {
            let encbuckets = get_reachability_credential(&server_addr).await;
            let cred = level_up(
                &server_addr,
                &lox_cred,
                &encbuckets,
                get_lox_pub(&lox_auth_pubkeys),
                get_reachability_pub(&lox_auth_pubkeys),
            )
            .await;
        }
    }
}