use fsrc_core::pool::{LocalPool, PoolCfg};
use fsrc_core::pus::verification::{
    CrossbeamVerifSender, FailParams, RequestId, VerificationReporterCfg,
    VerificationReporterWithSender,
};
use hashbrown::HashMap;
use spacepackets::ecss::{EcssEnumU16, EcssEnumU8, PusPacket};
use spacepackets::tc::{PusTc, PusTcSecondaryHeader};
use spacepackets::tm::PusTm;
use spacepackets::SpHeader;
use std::sync::{Arc, Mutex, RwLock};
use std::thread;
use std::time::Duration;

const TEST_APID: u16 = 0x03;
const FIXED_STAMP: [u8; 7] = [0; 7];
const PACKETS_SENT: u8 = 8;

/// This test also shows how the verification report could be used in a multi-threaded context,
/// wrapping it into an [Arc] and [Mutex] and then passing it to two threads.
///
///  - The first thread generates a acceptance, a start, two steps and one completion report
///  - The second generates an acceptance and start success report and a completion failure
///  - The third thread is the verification receiver. In the test case, it verifies the other two
///    threads have sent the correct expected verification reports
#[test]
fn test_shared_reporter() {
    let cfg = VerificationReporterCfg::new(TEST_APID, 1, 2, 8);
    // Shared pool object to store the verification PUS telemetry
    let pool_cfg = PoolCfg::new(vec![(10, 32), (10, 64), (10, 128), (10, 1024)]);
    let shared_tm_pool = Arc::new(RwLock::new(LocalPool::new(pool_cfg.clone())));
    let shared_tc_pool_0 = Arc::new(RwLock::new(LocalPool::new(pool_cfg)));
    let shared_tc_pool_1 = shared_tc_pool_0.clone();
    let (tx, rx) = crossbeam_channel::bounded(5);
    let sender = CrossbeamVerifSender::new(shared_tm_pool.clone(), tx.clone());
    let reporter_with_sender_0 = Arc::new(Mutex::new(VerificationReporterWithSender::new(
        cfg,
        Box::new(sender),
    )));
    let reporter_with_sender_1 = reporter_with_sender_0.clone();
    // For test purposes, we retrieve the request ID from the TCs and pass them to the receiver
    // tread.
    let req_id_0;
    let req_id_1;

    let (tx_tc_0, rx_tc_0) = crossbeam_channel::bounded(3);
    let (tx_tc_1, rx_tc_1) = crossbeam_channel::bounded(3);
    {
        let mut tc_guard = shared_tc_pool_0.write().unwrap();
        let mut sph = SpHeader::tc(TEST_APID, 0, 0).unwrap();
        let tc_header = PusTcSecondaryHeader::new_simple(17, 1);
        let pus_tc_0 = PusTc::new(&mut sph, tc_header, None, true);
        req_id_0 = RequestId::new(&pus_tc_0);
        let (addr, mut buf) = tc_guard.free_element(pus_tc_0.len_packed()).unwrap();
        pus_tc_0.write_to(&mut buf).unwrap();
        tx_tc_0.send(addr).unwrap();
        let mut sph = SpHeader::tc(TEST_APID, 1, 0).unwrap();
        let tc_header = PusTcSecondaryHeader::new_simple(5, 1);
        let pus_tc_1 = PusTc::new(&mut sph, tc_header, None, true);
        req_id_1 = RequestId::new(&pus_tc_1);
        let (addr, mut buf) = tc_guard.free_element(pus_tc_0.len_packed()).unwrap();
        pus_tc_1.write_to(&mut buf).unwrap();
        tx_tc_1.send(addr).unwrap();
    }
    let verif_sender_0 = thread::spawn(move || {
        let mut tc_buf: [u8; 1024] = [0; 1024];
        let tc_addr = rx_tc_0
            .recv_timeout(Duration::from_millis(20))
            .expect("Receive timeout");
        let tc_len;
        {
            let mut tc_guard = shared_tc_pool_0.write().unwrap();
            let pg = tc_guard.read_with_guard(tc_addr);
            let buf = pg.read().unwrap();
            tc_len = buf.len();
            tc_buf[0..tc_len].copy_from_slice(buf);
        }
        let (_tc, _) = PusTc::new_from_raw_slice(&tc_buf[0..tc_len]).unwrap();
        let accepted_token;
        {
            let mut mg = reporter_with_sender_0.lock().expect("Locking mutex failed");
            let token = mg.add_tc_with_req_id(req_id_0);
            accepted_token = mg
                .acceptance_success(token, &FIXED_STAMP)
                .expect("Acceptance success failed");
        }
        // Do some start handling here
        let started_token;
        {
            let mut mg = reporter_with_sender_0.lock().expect("Locking mutex failed");
            started_token = mg
                .start_success(accepted_token, &FIXED_STAMP)
                .expect("Start success failed");
            // Do some step handling here
            mg.step_success(&started_token, &FIXED_STAMP, EcssEnumU8::new(0))
                .expect("Start success failed");
        }
        // Finish up
        let mut mg = reporter_with_sender_0.lock().expect("Locking mutex failed");
        mg.step_success(&started_token, &FIXED_STAMP, EcssEnumU8::new(1))
            .expect("Start success failed");
        mg.completion_success(started_token, &FIXED_STAMP)
            .expect("Completion success failed");
    });

    let verif_sender_1 = thread::spawn(move || {
        let mut tc_buf: [u8; 1024] = [0; 1024];
        let tc_addr = rx_tc_1
            .recv_timeout(Duration::from_millis(20))
            .expect("Receive timeout");
        let tc_len;
        {
            let mut tc_guard = shared_tc_pool_1.write().unwrap();
            let pg = tc_guard.read_with_guard(tc_addr);
            let buf = pg.read().unwrap();
            tc_len = buf.len();
            tc_buf[0..tc_len].copy_from_slice(buf);
        }
        let (tc, _) = PusTc::new_from_raw_slice(&tc_buf[0..tc_len]).unwrap();
        let mut mg = reporter_with_sender_1
            .lock()
            .expect("Locking reporter failed");
        let token = mg.add_tc(&tc);
        let accepted_token = mg
            .acceptance_success(token, &FIXED_STAMP)
            .expect("Acceptance success failed");
        let started_token = mg
            .start_success(accepted_token, &FIXED_STAMP)
            .expect("Start success failed");
        let fail_code = EcssEnumU16::new(2);
        let params = FailParams::new(&FIXED_STAMP, &fail_code, None);
        mg.completion_failure(started_token, params)
            .expect("Completion success failed");
    });

    let verif_receiver = thread::spawn(move || {
        let mut packet_counter = 0;
        let mut tm_buf: [u8; 1024] = [0; 1024];
        let mut verif_map = HashMap::new();
        while packet_counter < PACKETS_SENT {
            let verif_addr = rx
                .recv_timeout(Duration::from_millis(50))
                .expect("Packet reception timeout");
            let tm_len;
            {
                let mut rg = shared_tm_pool.write().expect("Error locking shared pool");
                let store_guard = rg.read_with_guard(verif_addr);
                let slice = store_guard.read().expect("Error reading TM slice");
                tm_len = slice.len();
                tm_buf[0..tm_len].copy_from_slice(slice);
            }
            let (pus_tm, _) = PusTm::new_from_raw_slice(&tm_buf[0..tm_len], 7)
                .expect("Error reading verification TM");
            let req_id = RequestId::from_bytes(
                &pus_tm.source_data().expect("Invalid TM source data")[0..RequestId::SIZE_AS_BYTES],
            )
            .unwrap();
            if !verif_map.contains_key(&req_id) {
                let mut content = Vec::new();
                content.push(pus_tm.subservice());
                verif_map.insert(req_id, content);
            } else {
                let content = verif_map.get_mut(&req_id).unwrap();
                content.push(pus_tm.subservice())
            }
            packet_counter += 1;
        }
        for (req_id, content) in verif_map {
            if req_id == req_id_1 {
                assert_eq!(content[0], 1);
                assert_eq!(content[1], 3);
                assert_eq!(content[2], 8);
            } else if req_id == req_id_0 {
                assert_eq!(content[0], 1);
                assert_eq!(content[1], 3);
                assert_eq!(content[2], 5);
                assert_eq!(content[3], 5);
                assert_eq!(content[4], 7);
            } else {
                panic!("Unexpected request ID {:?}", req_id);
            }
        }
    });
    verif_sender_0.join().expect("Joining thread 0 failed");
    verif_sender_1.join().expect("Joining thread 1 failed");
    verif_receiver.join().expect("Joining thread 2 failed");
}