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//! Semtech SX1276/77/78/79 device.
//!
//! See [`Device`] documentation for more details.
//!
//! [`Device`]: struct.Device.html

use conn::{self, Conn, Reset};
use core::fmt;
use core::ops::{Deref, DerefMut};
use mode::{FskOok, Lora, Mode, Undefined};

/// Semtech SX1276/77/78/79 device.
pub struct Device<C: Conn, M: Mode> {
  _mode: M,
  tokens: C,
}

/// The error returned from [`Device::reset`].
///
/// [`Device::reset`]: struct.Device.html#method.reset
pub struct ResetError<C: Reset<T>, T> {
  /// Device.
  pub device: Device<C, Undefined>,
  /// Timer.
  pub timer: T,
  /// Kind of the error.
  pub kind: C::ResetErrorKind,
}

impl<C: Conn, M: Mode> Device<C, M> {
  #[inline(always)]
  pub(crate) fn from_tokens(tokens: C) -> Self {
    Self {
      _mode: M::default(),
      tokens,
    }
  }

  /// Initializes connected pins.
  #[inline(always)]
  pub fn init(&self) {
    self.tokens.init();
  }

  /// Returns underlying connection bindings.
  #[inline(always)]
  pub fn into_tokens(self) -> C {
    let Self { _mode, tokens } = self;
    tokens
  }

  /// Runs a reset procedure, and returns a future for its result. The mode will
  /// be set to LoRa on success.
  pub fn reset<T>(
    self,
    timer: T,
  ) -> impl Future<Item = (Device<C, FskOok>, T), Error = ResetError<C, T>>
  where
    C: Reset<T>,
  {
    let future = self.into_tokens().reset(timer);
    AsyncFuture::new(move || {
      let (tokens, timer) = await!(future)?;
      Ok((Device::from_tokens(tokens), timer))
    })
  }
}

impl<C: Conn> Device<C, FskOok> {
  /// Creates a new `Device` in FSK/OOK mode from provided `tokens`.
  #[inline(always)]
  pub fn new(tokens: C) -> Self {
    Self::from_tokens(tokens)
  }

  /// Converts into LoRa mode.
  #[inline(always)]
  pub unsafe fn into_lora(self) -> Device<C, Lora> {
    Device::from_tokens(self.into_tokens())
  }
}

impl<C: Conn> Device<C, Lora> {
  /// Converts into FSK/OOK mode.
  #[inline(always)]
  pub unsafe fn into_fsk_ook(self) -> Device<C, FskOok> {
    Device::from_tokens(self.into_tokens())
  }
}

impl<C: Conn> Device<C, Undefined> {
  /// Converts into LoRa mode.
  #[inline(always)]
  pub unsafe fn into_lora(self) -> Device<C, Lora> {
    Device::from_tokens(self.into_tokens())
  }

  /// Converts into FSK/OOK mode.
  #[inline(always)]
  pub unsafe fn into_fsk_ook(self) -> Device<C, FskOok> {
    Device::from_tokens(self.into_tokens())
  }
}

impl<C: Reset<T>, T> From<conn::ResetError<C, T>> for ResetError<C, T> {
  #[inline(always)]
  fn from(error: conn::ResetError<C, T>) -> Self {
    let conn::ResetError {
      tokens,
      timer,
      kind,
    } = error;
    let device = Device::from_tokens(tokens);
    Self {
      device,
      timer,
      kind,
    }
  }
}

impl<C: Conn, M: Mode> Deref for Device<C, M> {
  type Target = C;

  #[inline(always)]
  fn deref(&self) -> &C {
    &self.tokens
  }
}

impl<C: Conn, M: Mode> DerefMut for Device<C, M> {
  #[inline(always)]
  fn deref_mut(&mut self) -> &mut C {
    &mut self.tokens
  }
}

impl<C: Reset<T>, T> fmt::Debug for ResetError<C, T> {
  #[inline(always)]
  fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
    self.kind.fmt(f)
  }
}

impl<C: Reset<T>, T> PartialEq for ResetError<C, T> {
  #[inline(always)]
  fn eq(&self, other: &Self) -> bool {
    self.kind.eq(&other.kind)
  }
}

impl<C: Reset<T>, T> Eq for ResetError<C, T> {}