#![no_std]
#![no_main]

use crate::alloc::string::ToString;
use portable_atomic::{AtomicI32, AtomicU32, Ordering};
use embassy_executor::Spawner;
use embassy_futures::join::join;
use embassy_time::{with_timeout, Duration, Timer};
use esp_csi_rs::csi::CSIDataPacket;
use esp_csi_rs::logging::logging::LogMode;
use esp_csi_rs::{config::CsiConfig, logging::logging::init_logger, CSINode, CollectionMode};
use esp_csi_rs::{
    get_dropped_packets_rx, get_one_way_latency, get_pps_rx, get_pps_tx, get_rx_rate_hz,
    get_tx_rate_hz, get_two_way_latency,
    log_ln, set_csi_callback, CSINodeClient, CSINodeHardware, WifiStationConfig,
};
use esp_hal::clock::CpuClock;
use esp_hal::timer::timg::TimerGroup;
use esp_radio::wifi::sta::StationConfig;
use esp_radio::wifi::WifiController;
use {esp_backtrace as _, esp_println as _};

extern crate alloc;

static WIFI_CONTROLLER: static_cell::StaticCell<WifiController<'static>> =
    static_cell::StaticCell::new();

esp_bootloader_esp_idf::esp_app_desc!();

#[allow(
    clippy::large_stack_frames,
    reason = "it's not unusual to allocate larger buffers etc. in main"
)]

macro_rules! mk_static {
    ($t:ty,$val:expr) => {{
        static STATIC_CELL: static_cell::StaticCell<$t> = static_cell::StaticCell::new();
        #[deny(unused_attributes)]
        let x = STATIC_CELL.uninit().write(($val));
        x
    }};
}

// Shared state written by the inline CSI callback and read by `stats_task`.
static LATEST_RSSI: AtomicI32 = AtomicI32::new(0);
static CSI_PKT_COUNT: AtomicU32 = AtomicU32::new(0);

// On-device CSI processing hook. Runs inline in the WiFi callback — keep it
// fast: no heap allocation, no locking, no blocking I/O. For heavier work,
// copy what you need out of `packet` and post it to your own task.
fn on_csi(packet: &CSIDataPacket) {
    LATEST_RSSI.store(packet.rssi as i32, Ordering::Relaxed);
    CSI_PKT_COUNT.fetch_add(1, Ordering::Relaxed);
}

async fn stats_task() {
    with_timeout(Duration::from_secs(5), async {
        loop {
            Timer::after_secs(1).await;
            log_ln!(
                "RX PPS(avg): {}, TX PPS(avg): {}, RX Rate(Hz): {}, TX Rate(Hz): {}, RX Dropped Packets: {}, One Way Latency: {}, Two Way Latency: {}, CSI Packets: {}, Latest RSSI: {}",
                get_pps_rx(),
                get_pps_tx(),
                get_rx_rate_hz(),
                get_tx_rate_hz(),
                get_dropped_packets_rx(),
                get_one_way_latency(),
                get_two_way_latency(),
                CSI_PKT_COUNT.load(Ordering::Relaxed),
                LATEST_RSSI.load(Ordering::Relaxed),
            )
        }
    })
    .await
    .unwrap_err();
}

#[esp_rtos::main]
async fn main(spawner: Spawner) -> ! {
    let config = esp_hal::Config::default().with_cpu_clock(CpuClock::max());
    let peripherals = esp_hal::init(config);
    init_logger(spawner, LogMode::ArrayList);

    // Keep reclaimed heap moderate so internal RAM remains available for
    // Wi-Fi/RTOS task stacks during STA scan/connect.
    esp_alloc::heap_allocator!(#[esp_hal::ram(reclaimed)] size: 61440);

    let timg0 = TimerGroup::new(peripherals.TIMG0);
    let sw_interrupt =
        esp_hal::interrupt::software::SoftwareInterruptControl::new(peripherals.SW_INTERRUPT);
    esp_rtos::start(timg0.timer0, sw_interrupt.software_interrupt0);

    log_ln!("Embassy initialized!");
    log_ln!("Starting Wifi Station Node");

    let config_radio = esp_radio::wifi::ControllerConfig::default();
    let (wifi_controller, mut interfaces) =
        esp_radio::wifi::new(peripherals.WIFI, config_radio)
            .expect("Failed to initialize Wi-Fi controller");

    let controller = WIFI_CONTROLLER.init(wifi_controller);

    let client_config = StationConfig::default()
        .with_ssid("SSID")
        .with_password("PASS".to_string())
        .with_auth_method(esp_radio::wifi::AuthenticationMethod::Wpa2Personal);

    let station_config = WifiStationConfig {
        client_config, // Pass the config we created above
    };

    // Create a CSI Client Instance to handle CSI data and control messages
    let mut node_handle = CSINodeClient::new();
    // Create a CSINodeHardware instance which will be used by the CSINode to interact with the Wi-Fi hardware
    let csi_hardware = CSINodeHardware::new(&mut interfaces, controller);
    let mut node = CSINode::new(
        esp_csi_rs::Node::Central(esp_csi_rs::CentralOpMode::WifiStation(station_config)),
        CollectionMode::Collector,
        Some(CsiConfig::default()),
        Some(1000),
        csi_hardware,
    );
    #[cfg(feature = "esp32c6")]
    node.set_protocol(esp_radio::wifi::Protocol::AX);
    #[cfg(not(feature = "esp32c6"))]
    node.set_protocol(esp_radio::wifi::Protocol::N);

    // Register the on-device CSI processing hook. Runs inline in the WiFi
    // callback for every CSI packet — also implicitly enables the publish
    // gate so the callback fires.
    set_csi_callback(on_csi);

    // Drive stats for the configured timeout, then ask the node to stop so
    // `node.run()` can drain its STA tasks and the join completes. Without
    // sending stop the join blocks forever and we never reach the loop below.
    let driver = async {
        stats_task().await;
        node_handle.send_stop().await;
    };
    join(node.run(), driver).await;

    loop {
        log_ln!("Hello world!");
        Timer::after(Duration::from_secs(1)).await;
    }

    // for inspiration have a look at the examples at https://github.com/esp-rs/esp-hal/tree/esp-hal-v~1.0/examples
}
