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use super::{StatePack, Stateful, StatefulExt};
use crate::messages::Message;
use decanter::prelude::{Hash, Hashable, H256};
use serde::{Deserialize, Serialize};
use serde_json::Value;
#[derive(Clone, Copy, Debug, Default, Deserialize, Eq, Hash, PartialEq, Serialize)]
pub enum States {
#[default]
Error = 0,
Idle = 1,
}
impl StatePack for States {}
#[derive(Clone, Debug, Deserialize, Eq, Hash, PartialEq, Serialize)]
pub struct State<S: StatePack = States, T: Default = H256> {
pub events: Vec<String>,
pub message: Message<T>,
pub metadata: Value,
pub state: S,
pub timestamp: i64,
}
impl<S: StatePack, T: Default> State<S, T> {
pub fn new(events: Option<Vec<String>>, message: Option<Message<T>>, state: Option<S>) -> Self {
Self {
events: events.unwrap_or_default(),
message: message.unwrap_or_default(),
metadata: Default::default(),
state: state.unwrap_or_default(),
timestamp: chrono::Utc::now().timestamp(),
}
}
}
impl<S: Clone + StatePack, T: Clone + Default> Stateful<S> for State<S, T> {
type Data = T;
fn message(self) -> Message<Self::Data> {
self.message
}
fn timestamp(self) -> i64 {
self.timestamp
}
fn state(self) -> S {
self.state
}
}
impl<S: Clone + StatePack, T: Clone + Default> StatefulExt<S> for State<S, T> {
fn update_state(&mut self, msg: Option<Message<Self::Data>>, state: S) -> &Self {
self.message = msg.unwrap_or_default();
self.state = state;
self.timestamp = Self::now();
self
}
}
impl<S: StatePack, T: Default> Default for State<S, T> {
fn default() -> Self {
Self::new(None, None, None)
}
}
impl<S: StatePack, T: Default> From<T> for State<S, T> {
fn from(data: T) -> Self {
Self::new(None, Some(Message::from(data)), None)
}
}
impl std::fmt::Display for States {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(f, "{}", serde_json::to_string(&self).unwrap())
}
}
impl<S: StatePack, T: Default> std::fmt::Display for State<S, T>
where
S: Serialize,
T: Serialize,
{
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(f, "{}", serde_json::to_string(&self).unwrap())
}
}
#[cfg(test)]
mod tests {
use super::*;
#[derive(Clone, Debug, Default, Deserialize, Eq, PartialEq, Serialize)]
enum States {
#[default]
A = 0,
B = 1,
}
impl StatePack for States {}
impl std::fmt::Display for States {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(f, "{}", serde_json::to_string(&self).unwrap())
}
}
#[test]
fn test_default_state() {
let a = State::<States, serde_json::Value>::default();
let b = a.clone();
assert_eq!(&a, &b);
}
}