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use anyhow::{Context, Result};
use serde::{Deserialize, Serialize};
use std::fs;
use crate::exercise::Exercise;
use super::{AppState, STATE_FILE_NAME};
#[derive(Deserialize)]
pub struct ExerciseStateDeser {
pub name: String,
pub done: bool,
}
#[derive(Serialize)]
struct ExerciseStateSer<'a> {
name: &'a str,
done: bool,
}
struct ExercisesStateSerializer<'a>(&'a [Exercise]);
impl<'a> Serialize for ExercisesStateSerializer<'a> {
fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
where
S: serde::Serializer,
{
let iter = self.0.iter().map(|exercise| ExerciseStateSer {
name: exercise.name,
done: exercise.done,
});
serializer.collect_seq(iter)
}
}
#[derive(Deserialize)]
pub struct StateFileDeser {
pub current_exercise_ind: usize,
pub exercises: Vec<ExerciseStateDeser>,
}
#[derive(Serialize)]
struct StateFileSer<'a> {
current_exercise_ind: usize,
exercises: ExercisesStateSerializer<'a>,
}
impl StateFileDeser {
pub fn read() -> Option<Self> {
let file_content = fs::read(STATE_FILE_NAME).ok()?;
serde_json::de::from_slice(&file_content).ok()
}
}
pub fn write(app_state: &AppState) -> Result<()> {
let content = StateFileSer {
current_exercise_ind: app_state.current_exercise_ind,
exercises: ExercisesStateSerializer(&app_state.exercises),
};
let mut buf = Vec::with_capacity(4096);
serde_json::ser::to_writer(&mut buf, &content).context("Failed to serialize the state")?;
fs::write(STATE_FILE_NAME, buf)
.with_context(|| format!("Failed to write the state file `{STATE_FILE_NAME}`"))?;
Ok(())
}
#[cfg(test)]
mod tests {
use crate::info_file::Mode;
use super::*;
#[test]
fn ser_deser_sync() {
let current_exercise_ind = 1;
let exercises = [
Exercise {
name: "1",
path: "exercises/1.rs",
mode: Mode::Run,
hint: String::new(),
done: true,
},
Exercise {
name: "2",
path: "exercises/2.rs",
mode: Mode::Test,
hint: String::new(),
done: false,
},
];
let ser = StateFileSer {
current_exercise_ind,
exercises: ExercisesStateSerializer(&exercises),
};
let deser: StateFileDeser =
serde_json::de::from_slice(&serde_json::ser::to_vec(&ser).unwrap()).unwrap();
assert_eq!(deser.current_exercise_ind, current_exercise_ind);
assert!(deser
.exercises
.iter()
.zip(exercises)
.all(|(deser, ser)| deser.name == ser.name && deser.done == ser.done));
}
}
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