use std::{
    net::{IpAddr, SocketAddr},
    sync::{mpsc, Arc, Mutex},
    thread,
    time::Duration,
};

use eps::{
    pcdu::{PcduHandler, SerialInterfaceDummy, SerialInterfaceToSim, SerialSimInterfaceWrapper},
    PowerSwitchHelper,
};
use interface::{
    sim_client_udp::create_sim_client,
    tcp::{SyncTcpTmSource, TcpTask},
    udp::UdpTmtcServer,
};
use log::info;
use logger::setup_logger;
use models::ComponentId;
use satrs::{
    hal::std::{tcp_server::ServerConfig, udp_server::UdpTcServer},
    mode::{Mode, ModeAndSubmode, ModeRequest, ModeRequestHandlerMpscBounded},
    pus::HandlingStatus,
    request::{GenericMessage, MessageMetadata},
    spacepackets::time::cds::CdsTime,
};
use satrs_example::{
    config::{
        components::NO_SENDER,
        tasks::{FREQ_MS_AOCS, FREQ_MS_CONTROLLER, FREQ_MS_UDP_TMTC, SIM_CLIENT_IDLE_DELAY_MS},
        OBSW_SERVER_ADDR, PACKET_ID_VALIDATOR, SERVER_PORT,
    },
    DeviceMode,
};
use tmtc::sender::TmTcSender;
use tmtc::{tc_source::TcSourceTask, tm_sink::TmSink};

use crate::{
    acs::mgm::{MgmHandlerLis3Mdl, SpiDummyInterface, SpiSimInterface, SpiSimInterfaceWrapper},
    control::Controller,
    eps::pcdu::SwitchSet,
    event_manager::EventManager,
    interface::udp::UdpTmHandlerWithChannel,
    tmtc::tc_source::CcsdsDistributor,
};

mod acs;
mod ccsds;
mod control;
mod eps;
mod event_manager;
mod interface;
mod logger;
mod spi;
mod tmtc;

fn main() {
    setup_logger().expect("setting up logging with fern failed");
    println!("Runng OBSW example");

    let (tc_source_tx, tc_source_rx) = mpsc::sync_channel(50);
    let (tm_sink_tx, tm_sink_rx) = mpsc::sync_channel(50);
    let (tm_server_tx, tm_server_rx) = mpsc::sync_channel(50);

    let (sim_request_tx, sim_request_rx) = mpsc::channel();
    let (mgm_0_sim_reply_tx, mgm_0_sim_reply_rx) = mpsc::channel();
    let (mgm_1_sim_reply_tx, mgm_1_sim_reply_rx) = mpsc::channel();
    let (pcdu_sim_reply_tx, pcdu_sim_reply_rx) = mpsc::channel();
    let mut opt_sim_client = create_sim_client(sim_request_rx);

    let (mgm_0_handler_tc_tx, mgm_0_handler_tc_rx) = mpsc::sync_channel(10);
    let (mgm_1_handler_tc_tx, mgm_1_handler_tc_rx) = mpsc::sync_channel(10);
    let (pcdu_handler_tc_tx, pcdu_handler_tc_rx) = mpsc::sync_channel(30);
    let (controller_tc_tx, controller_tc_rx) = mpsc::sync_channel(10);

    let (_mgm_0_handler_mode_tx, mgm_0_handler_mode_rx) = mpsc::sync_channel(5);
    let (_mgm_1_handler_mode_tx, mgm_1_handler_mode_rx) = mpsc::sync_channel(5);
    let (pcdu_handler_mode_tx, pcdu_handler_mode_rx) = mpsc::sync_channel(5);

    let (event_ctrl_tx, event_ctrl_rx) = mpsc::sync_channel(10);
    let mut event_manager = EventManager {
        ctrl_rx: event_ctrl_rx,
        tm_tx: tm_sink_tx.clone(),
    };

    let mut controller = Controller::new(controller_tc_rx, tm_sink_tx.clone(), event_ctrl_tx);

    let ccsds_distributor = CcsdsDistributor::default();
    let mut tc_source = TcSourceTask::new(tc_source_rx, ccsds_distributor);
    tc_source.add_target(ComponentId::EpsPcdu, pcdu_handler_tc_tx);
    tc_source.add_target(ComponentId::Controller, controller_tc_tx);
    tc_source.add_target(ComponentId::AcsMgm0, mgm_0_handler_tc_tx);
    tc_source.add_target(ComponentId::AcsMgm1, mgm_1_handler_tc_tx);

    let tc_sender = TmTcSender::Normal(tc_source_tx.clone());
    let udp_tm_handler = UdpTmHandlerWithChannel {
        tm_rx: tm_server_rx,
    };

    let sock_addr = SocketAddr::new(IpAddr::V4(OBSW_SERVER_ADDR), SERVER_PORT);
    let udp_tc_server = UdpTcServer::new(
        ComponentId::UdpServer as u32,
        sock_addr,
        2048,
        tc_sender.clone(),
    )
    .expect("creating UDP TMTC server failed");
    let mut udp_tmtc_server = UdpTmtcServer {
        udp_tc_server,
        tm_handler: udp_tm_handler.into(),
    };

    let tcp_server_cfg = ServerConfig::new(
        ComponentId::TcpServer as u32,
        sock_addr,
        Duration::from_millis(400),
        4096,
        8192,
    );
    let sync_tm_tcp_source = SyncTcpTmSource::new(200);
    let mut tcp_server = TcpTask::new(
        tcp_server_cfg,
        sync_tm_tcp_source.clone(),
        tc_sender,
        PACKET_ID_VALIDATOR.clone(),
    )
    .expect("tcp server creation failed");

    let mut tm_sink = TmSink::new(sync_tm_tcp_source, tm_sink_rx, tm_server_tx);

    let shared_switch_set = Arc::new(Mutex::new(SwitchSet::new_with_init_switches_unknown()));
    let (switch_request_tx, switch_request_rx) = mpsc::sync_channel(20);
    let switch_helper = PowerSwitchHelper::new(switch_request_tx, shared_switch_set.clone());

    let shared_mgm_0_set = Arc::default();
    let shared_mgm_1_set = Arc::default();
    let mgm_0_mode_node =
        ModeRequestHandlerMpscBounded::new(ComponentId::AcsMgm0 as u32, mgm_0_handler_mode_rx);
    let mgm_1_mode_node =
        ModeRequestHandlerMpscBounded::new(ComponentId::AcsMgm1 as u32, mgm_1_handler_mode_rx);
    let (mgm_0_spi_interface, mgm_1_spi_interface) =
        if let Some(sim_client) = opt_sim_client.as_mut() {
            sim_client
                .add_reply_recipient(satrs_minisim::SimComponent::Mgm0Lis3Mdl, mgm_0_sim_reply_tx);
            sim_client
                .add_reply_recipient(satrs_minisim::SimComponent::Mgm1Lis3Mdl, mgm_1_sim_reply_tx);
            (
                SpiSimInterfaceWrapper::Sim(SpiSimInterface {
                    sim_request_tx: sim_request_tx.clone(),
                    sim_reply_rx: mgm_0_sim_reply_rx,
                }),
                SpiSimInterfaceWrapper::Sim(SpiSimInterface {
                    sim_request_tx: sim_request_tx.clone(),
                    sim_reply_rx: mgm_1_sim_reply_rx,
                }),
            )
        } else {
            (
                SpiSimInterfaceWrapper::Dummy(SpiDummyInterface::default()),
                SpiSimInterfaceWrapper::Dummy(SpiDummyInterface::default()),
            )
        };
    let mut mgm_0_handler = MgmHandlerLis3Mdl::new(
        ComponentId::AcsMgm0,
        "MGM_0",
        mgm_0_mode_node,
        mgm_0_handler_tc_rx,
        tm_sink_tx.clone(),
        switch_helper.clone(),
        mgm_0_spi_interface,
        shared_mgm_0_set,
    );
    let mut mgm_1_handler = MgmHandlerLis3Mdl::new(
        ComponentId::AcsMgm1,
        "MGM_1",
        mgm_1_mode_node,
        mgm_1_handler_tc_rx,
        tm_sink_tx.clone(),
        switch_helper.clone(),
        mgm_1_spi_interface,
        shared_mgm_1_set,
    );
    // Connect PUS service to device handlers.
    /*
    connect_mode_nodes(
        &mut pus_stack.mode_srv,
        mgm_0_handler_mode_tx,
        &mut mgm_0_handler,
        pus_mode_reply_tx.clone(),
    );
    connect_mode_nodes(
        &mut pus_stack.mode_srv,
        mgm_1_handler_mode_tx,
        &mut mgm_1_handler,
        pus_mode_reply_tx.clone(),
    );
    */

    let pcdu_serial_interface = if let Some(sim_client) = opt_sim_client.as_mut() {
        sim_client.add_reply_recipient(satrs_minisim::SimComponent::Pcdu, pcdu_sim_reply_tx);
        SerialSimInterfaceWrapper::Sim(SerialInterfaceToSim::new(
            sim_request_tx.clone(),
            pcdu_sim_reply_rx,
        ))
    } else {
        SerialSimInterfaceWrapper::Dummy(SerialInterfaceDummy::default())
    };
    let pcdu_mode_node =
        ModeRequestHandlerMpscBounded::new(ComponentId::EpsPcdu as u32, pcdu_handler_mode_rx);
    let mut pcdu_handler = PcduHandler::new(
        pcdu_mode_node,
        pcdu_handler_tc_rx,
        tm_sink_tx.clone(),
        switch_request_rx,
        pcdu_serial_interface,
        shared_switch_set,
    );
    /*
    connect_mode_nodes(
        &mut pus_stack.mode_srv,
        pcdu_handler_mode_tx.clone(),
        &mut pcdu_handler,
        pus_mode_reply_tx,
    );
    */

    // The PCDU is a critical component which should be in normal mode immediately.
    pcdu_handler_mode_tx
        .send(GenericMessage::new(
            MessageMetadata::new(0, NO_SENDER),
            ModeRequest::SetMode {
                mode_and_submode: ModeAndSubmode::new(DeviceMode::Normal as Mode, 0),
                forced: false,
            },
        ))
        .expect("sending initial mode request failed");

    info!("Starting TMTC and UDP task");
    let jh_udp_tmtc = thread::Builder::new()
        .name("TMTC & UDP".to_string())
        .spawn(move || {
            info!("Running UDP server on port {SERVER_PORT}");
            loop {
                udp_tmtc_server.periodic_operation();
                tc_source.periodic_operation();
                thread::sleep(Duration::from_millis(FREQ_MS_UDP_TMTC));
            }
        })
        .unwrap();

    info!("Starting TCP task");
    let jh_tcp = thread::Builder::new()
        .name("TCP".to_string())
        .spawn(move || {
            info!("Running TCP server on port {SERVER_PORT}");
            loop {
                tcp_server.periodic_operation();
            }
        })
        .unwrap();

    info!("Starting TM funnel task");
    let jh_tm_funnel = thread::Builder::new()
        .name("TM SINK".to_string())
        .spawn(move || loop {
            tm_sink.operation();
        })
        .unwrap();

    let mut opt_jh_sim_client = None;
    if let Some(mut sim_client) = opt_sim_client {
        info!("Starting UDP sim client task");
        opt_jh_sim_client = Some(
            thread::Builder::new()
                .name("SIM ADAPTER".to_string())
                .spawn(move || loop {
                    if sim_client.operation() == HandlingStatus::Empty {
                        std::thread::sleep(Duration::from_millis(SIM_CLIENT_IDLE_DELAY_MS));
                    }
                })
                .unwrap(),
        );
    }

    info!("Starting AOCS thread");
    let jh_aocs = thread::Builder::new()
        .name("AOCS".to_string())
        .spawn(move || loop {
            mgm_0_handler.periodic_operation();
            mgm_1_handler.periodic_operation();
            thread::sleep(Duration::from_millis(FREQ_MS_AOCS));
        })
        .unwrap();

    info!("Starting EPS thread");
    let jh_eps = thread::Builder::new()
        .name("EPS".to_string())
        .spawn(move || loop {
            // TODO: We should introduce something like a fixed timeslot helper to allow a more
            // declarative API. It would also be very useful for the AOCS task.
            //
            // TODO: The fixed timeslot handler exists.. use it.
            // TODO: Why not just use sync code in the PCDU handler, and fully delay there?
            pcdu_handler.periodic_operation(crate::eps::pcdu::OpCode::RegularOp);
            thread::sleep(Duration::from_millis(50));
            pcdu_handler.periodic_operation(crate::eps::pcdu::OpCode::PollAndRecvReplies);
            thread::sleep(Duration::from_millis(50));
            pcdu_handler.periodic_operation(crate::eps::pcdu::OpCode::PollAndRecvReplies);
            thread::sleep(Duration::from_millis(300));
        })
        .unwrap();

    info!("Starting controller thread");
    let jh_controller_thread = thread::Builder::new()
        .name("CTRL".to_string())
        .spawn(move || loop {
            controller.periodic_operation();
            event_manager.periodic_operation();
            thread::sleep(Duration::from_millis(FREQ_MS_CONTROLLER));
        })
        .unwrap();

    jh_udp_tmtc
        .join()
        .expect("Joining UDP TMTC server thread failed");
    jh_tcp
        .join()
        .expect("Joining TCP TMTC server thread failed");
    jh_tm_funnel
        .join()
        .expect("Joining TM Funnel thread failed");
    if let Some(jh_sim_client) = opt_jh_sim_client {
        jh_sim_client
            .join()
            .expect("Joining SIM client thread failed");
    }
    jh_aocs.join().expect("Joining AOCS thread failed");
    jh_eps.join().expect("Joining EPS thread failed");
    jh_controller_thread
        .join()
        .expect("Joining PUS handler thread failed");
}

pub fn update_time(time_provider: &mut CdsTime, timestamp: &mut [u8]) {
    time_provider
        .update_from_now()
        .expect("Could not get current time");
    time_provider
        .write_to_bytes(timestamp)
        .expect("Writing timestamp failed");
}