#![no_std]
#![feature(lang_items, const_extern_fn)]
#![deny(
  warnings,
  nonstandard_style,
  unused,
  future_incompatible,
  rust_2018_idioms
)]
#![deny(clippy::all, clippy::nursery, clippy::pedantic)]

use windows_kernel_rs::{
  device::{
    Completion,
    Device,
    DeviceDoFlags,
    DeviceFlags,
    DeviceOperations,
    DeviceType,
    RequestError,
  },
  kernel_module,
  println,
  request::IoRequest,
  Access,
  Driver,
  Error,
  KernelModule,
  SymbolicLink,
};

struct MyDevice;

impl DeviceOperations for MyDevice {
  fn create(&mut self, _device: &Device, request: IoRequest) -> Result<Completion, RequestError> {
    println!("userspace opened the device");

    Ok(Completion::Complete(0, request))
  }

  fn close(&mut self, _device: &Device, request: IoRequest) -> Result<Completion, RequestError> {
    println!("userspace closed the device");

    Ok(Completion::Complete(0, request))
  }

  fn cleanup(&mut self, _device: &Device, request: IoRequest) -> Result<Completion, RequestError> {
    println!("device is no longer in use by userspace");

    Ok(Completion::Complete(0, request))
  }
}

struct Module {
  _device:        Device,
  _symbolic_link: SymbolicLink,
}

impl KernelModule for Module {
  fn init(mut driver: Driver, _: &str) -> Result<Self, Error> {
    let device = driver.create_device(
      "\\Device\\Example",
      DeviceType::Unknown,
      DeviceFlags::SECURE_OPEN,
      DeviceDoFlags::DO_BUFFERED_IO,
      Access::NonExclusive,
      MyDevice,
    )?;
    let symbolic_link = SymbolicLink::new("\\??\\Example", "\\Device\\Example")?;

    Ok(Module {
      _device:        device,
      _symbolic_link: symbolic_link,
    })
  }

  fn cleanup(&mut self, _driver: Driver) {}
}

kernel_module!(Module);