mod client_lib;
use client_lib::*;

mod client_net;
use client_net::HyperNet;

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

// 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");
    //#[cfg(test)]
    opts.optopt(
        "A",
        "advance-days",
        "increase server days by NUM_DAYS",
        "NUM_DAYS",
    );
    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 net = if matches.opt_present("server") {
        HyperNet {
            hostname: matches.opt_str("server").unwrap(),
        }
    } else {
        HyperNet {
            hostname: "http://localhost:8001".to_string(),
        }
    };

    // Advance days on server (TESTING ONLY)
    //#[cfg(test)]
    if matches.opt_present("A") {
        let days: u16 = u16::from_str(matches.opt_str("A").unwrap().as_str()).unwrap();
        let today: u32 = advance_days(&net, days).await;
        println!("Today's date according to the server: {}", today);
    }

    // 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(&net).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 bucket_filename = "bucket.json";
    let (lox_cred, bucket) = if matches.opt_present("N")
        || !Path::new(lox_cred_filename).exists()
        || !Path::new(bucket_filename).exists()
    {
        // get new Lox Credential
        let open_invite = get_open_invitation(&net).await;
        let (cred, bl) =
            get_lox_credential(&net, &open_invite, get_lox_pub(&lox_auth_pubkeys)).await;
        let mut bucket = [BridgeLine::default(); MAX_BRIDGES_PER_BUCKET];
        // note: this is a bucket with one real bridgeline and n-1
        // default (zeroed out) bridgelines
        bucket[0] = bl;

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

    let lox_cred = if matches.opt_present("L") {
        let old_level = get_cred_trust_level(&lox_cred);

        // If trust level is 0, do trust promotion, otherwise level up.
        let cred = if old_level == 0 {
            if eligible_for_trust_promotion(&net, &lox_cred).await {
                let migration_cred =
                    trust_promotion(&net, &lox_cred, get_lox_pub(&lox_auth_pubkeys)).await;
                let cred = trust_migration(
                    &net,
                    &lox_cred,
                    &migration_cred,
                    get_lox_pub(&lox_auth_pubkeys),
                    get_migration_pub(&lox_auth_pubkeys),
                )
                .await;
                cred
            } else {
                lox_cred
            }
        } else {
            if eligible_for_level_up(&net, &lox_cred).await {
                let encbuckets = get_reachability_credential(&net).await;
                let cred = level_up(
                    &net,
                    &lox_cred,
                    &encbuckets,
                    get_lox_pub(&lox_auth_pubkeys),
                    get_reachability_pub(&lox_auth_pubkeys),
                )
                .await;
                cred
            } else {
                lox_cred
            }
        };
        save_object(&cred, &lox_cred_filename);
        let new_level = get_cred_trust_level(&cred);
        if new_level > old_level {
            println!("Old level: {}\nNew level: {}", old_level, new_level);
        } else if new_level == old_level {
            println!("Unable to level up. Current level: {}", new_level);
        }
        cred
    } else {
        lox_cred
    };
}