#![no_std]
#![no_main]
#![feature(type_alias_impl_trait)]

use defmt::*;
use embassy_executor::Spawner;
use embassy_net::tcp::client::{TcpClient, TcpClientState};
use embassy_net::{Stack, StackResources};
use embassy_stm32::eth::generic_smi::GenericSMI;
use embassy_stm32::eth::{Ethernet, PacketQueue};
use embassy_stm32::peripherals::ETH;
use embassy_stm32::rng::Rng;
use embassy_stm32::time::mhz;
use embassy_stm32::{bind_interrupts, eth, peripherals, rng, Config};
use embassy_time::{Duration, Timer};
use embedded_io_async::Write;
use embedded_nal_async::{Ipv4Addr, SocketAddr, SocketAddrV4, TcpConnect};
use rand_core::RngCore;
use static_cell::make_static;
use {defmt_rtt as _, panic_probe as _};

bind_interrupts!(struct Irqs {
    ETH => eth::InterruptHandler;
    RNG => rng::InterruptHandler<peripherals::RNG>;
});

type Device = Ethernet<'static, ETH, GenericSMI>;

#[embassy_executor::task]
async fn net_task(stack: &'static Stack<Device>) -> ! {
    stack.run().await
}

#[embassy_executor::main]
async fn main(spawner: Spawner) -> ! {
    let mut config = Config::default();
    config.rcc.sys_ck = Some(mhz(400));
    config.rcc.hclk = Some(mhz(200));
    config.rcc.pll1.q_ck = Some(mhz(100));
    let p = embassy_stm32::init(config);
    info!("Hello World!");

    // Generate random seed.
    let mut rng = Rng::new(p.RNG, Irqs);
    let mut seed = [0; 8];
    rng.fill_bytes(&mut seed);
    let seed = u64::from_le_bytes(seed);

    let mac_addr = [0x00, 0x00, 0xDE, 0xAD, 0xBE, 0xEF];

    let device = Ethernet::new(
        make_static!(PacketQueue::<16, 16>::new()),
        p.ETH,
        Irqs,
        p.PA1,
        p.PA2,
        p.PC1,
        p.PA7,
        p.PC4,
        p.PC5,
        p.PG13,
        p.PB13,
        p.PG11,
        GenericSMI::new(),
        mac_addr,
        0,
    );

    let config = embassy_net::Config::dhcpv4(Default::default());
    //let config = embassy_net::Config::ipv4_static(embassy_net::StaticConfigV4 {
    //    address: Ipv4Cidr::new(Ipv4Address::new(10, 42, 0, 61), 24),
    //    dns_servers: Vec::new(),
    //    gateway: Some(Ipv4Address::new(10, 42, 0, 1)),
    //});

    // Init network stack
    let stack = &*make_static!(Stack::new(
        device,
        config,
        make_static!(StackResources::<2>::new()),
        seed
    ));

    // Launch network task
    unwrap!(spawner.spawn(net_task(&stack)));

    info!("Network task initialized");

    // To ensure DHCP configuration before trying connect
    Timer::after(Duration::from_secs(20)).await;

    static STATE: TcpClientState<1, 1024, 1024> = TcpClientState::new();
    let client = TcpClient::new(&stack, &STATE);

    loop {
        let addr = SocketAddr::V4(SocketAddrV4::new(Ipv4Addr::new(10, 42, 0, 1), 8000));

        info!("connecting...");
        let r = client.connect(addr).await;
        if let Err(e) = r {
            info!("connect error: {:?}", e);
            Timer::after(Duration::from_secs(1)).await;
            continue;
        }
        let mut connection = r.unwrap();
        info!("connected!");
        loop {
            let r = connection.write_all(b"Hello\n").await;
            if let Err(e) = r {
                info!("write error: {:?}", e);
                continue;
            }
            Timer::after(Duration::from_secs(1)).await;
        }
    }
}