/* This file is part of DarkFi (https://dark.fi)
 *
 * Copyright (C) 2020-2025 Dyne.org foundation
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as
 * published by the Free Software Foundation, either version 3 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */

use std::time::Instant;

use tfhe::integer::ciphertext::RadixCiphertext;
use tfhe::integer::keycache::IntegerKeyCache;
use tfhe::integer::{IntegerKeyKind, ServerKey};
use tfhe::shortint::parameters::PARAM_MESSAGE_2_CARRY_2_KS_PBS;

mod fhe;
mod improved_parallel_fhe;
mod improved_plain;
mod parallel_fhe;
mod plain;

/// The number of blocks to be used in the Radix.
const NUMBER_OF_BLOCKS: usize = 8;

#[allow(clippy::type_complexity)]
fn test_cases() -> Vec<(String, (Vec<u16>, Vec<u16>, Vec<u16>, Vec<u16>))> {
    vec![
        (
            "empty sell orders".to_owned(),
            (vec![], (1..11).collect::<Vec<_>>(), vec![], vec![0; 10]),
        ),
        (
            "empty buy orders".to_owned(),
            ((1..11).collect::<Vec<_>>(), vec![], vec![0; 10], vec![]),
        ),
        (
            "exact matching of sell and buy orders".to_owned(),
            (
                (1..11).collect::<Vec<_>>(),
                (1..11).collect::<Vec<_>>(),
                (1..11).collect::<Vec<_>>(),
                (1..11).collect::<Vec<_>>(),
            ),
        ),
        (
            "a case where there are more buy orders than sell orders".to_owned(),
            (vec![10; 10], vec![200], vec![10; 10], vec![100]),
        ),
        (
            "a case where there are more sell orders than buy orders".to_owned(),
            (vec![200], vec![10; 10], vec![100], vec![10; 10]),
        ),
        (
            "maximum input size for sell and buy orders".to_owned(),
            (
                vec![100; 499],
                vec![100; 499],
                vec![100; 499],
                vec![100; 499],
            ),
        ),
    ]
}

/// Runs the given [tester] function with the test cases for volume matching algorithm.
fn run_test_cases(tester: impl Fn(&[u16], &[u16], &[u16], &[u16])) {
    for (test_name, test_case) in &test_cases() {
        println!("Testing {test_name}...");
        tester(&test_case.0, &test_case.1, &test_case.2, &test_case.3);
        println!();
    }
}

fn test_volume_match_plain(function: fn(&mut [u16], &mut [u16])) {
    println!("Running test cases for the plain implementation");
    run_test_cases(|a, b, c, d| plain::tester(a, b, c, d, function));
}

fn test_volume_match_fhe(
    fhe_function: fn(&mut [RadixCiphertext], &mut [RadixCiphertext], &ServerKey),
) {
    println!("Generating keys...");
    let time = Instant::now();
    let (client_key, server_key) =
        IntegerKeyCache.get_from_params(PARAM_MESSAGE_2_CARRY_2_KS_PBS, IntegerKeyKind::Radix);
    println!("Keys generated in {:?}", time.elapsed());

    println!("Running test cases for the FHE implementation");
    run_test_cases(|a, b, c, d| fhe::tester(&client_key, &server_key, a, b, c, d, fhe_function));
}

fn main() {
    for argument in std::env::args() {
        if argument == "plain" {
            println!("Running plain version");
            test_volume_match_plain(plain::volume_match);
            println!();
        }
        if argument == "plain-improved" {
            println!("Running plain improved version");
            test_volume_match_plain(improved_plain::volume_match);
            println!();
        }
        if argument == "fhe" {
            println!("Running fhe version");
            test_volume_match_fhe(fhe::volume_match);
            println!();
        }
        if argument == "fhe-parallel" {
            println!("Running parallelized fhe version");
            test_volume_match_fhe(parallel_fhe::volume_match);
            println!();
        }
        if argument == "fhe-improved" {
            println!("Running improved parallelized fhe fhe version");
            test_volume_match_fhe(improved_parallel_fhe::volume_match);
            println!();
        }
    }
}
