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use core::fmt::Debug;

use kwap_common::Array;
use kwap_msg::{Opt, OptNumber};
#[cfg(feature = "alloc")]
use std_alloc::vec::Vec;

use crate::core::event::Event;

/// Configures `kwap` to use `Vec` for collections
///
/// ```
/// use kwap::config::Alloc;
/// use kwap::req::Req;
///
/// // Uses `Vec` for all internal storage
/// Req::<Alloc>::get("192.168.0.1", 5683, "/hello");
/// ```
#[cfg(feature = "alloc")]
#[derive(Debug, Clone, Copy)]
pub struct Alloc;

#[cfg(feature = "alloc")]
impl Config for Alloc {
  type PayloadBuffer = Vec<u8>;
  type OptBytes = Vec<u8>;
  type Opts = Vec<Opt<Vec<u8>>>;
  type OptNumbers = Vec<(OptNumber, Opt<Vec<u8>>)>;
  type Events = Vec<Event<Self>>;
}

/// kwap configuration trait
pub trait Config: Sized + 'static + core::fmt::Debug {
  /// What type should we use to store the message payloads?
  type PayloadBuffer: Array<Item = u8> + Clone + Debug;
  /// What type should we use to store the option values?
  type OptBytes: Array<Item = u8> + 'static + Clone + Debug;
  /// What type should we use to store the options?
  type Opts: Array<Item = Opt<Self::OptBytes>> + Clone + Debug;

  /// What type should we use to keep track of options before serializing?
  type OptNumbers: Array<Item = (OptNumber, Opt<Self::OptBytes>)> + Clone + Debug;

  /// What type should we use to store events?
  type Events: Array<Item = Event<Self>>;
}

/// Type alias using Config instead of explicit type parameters for [`kwap_msg::Message`]
pub type Message<Cfg> =
  kwap_msg::Message<<Cfg as Config>::PayloadBuffer, <Cfg as Config>::OptBytes, <Cfg as Config>::Opts>;