use std::{
    collections::HashSet,
    fs::File,
    io::{self, Read, Write},
};

use crate::language::DebugAsk;

#[derive(Serialize, Deserialize)]
pub struct ReplOptions {
    pub debug_asks: HashSet<DebugAsk>,
    pub show_total_time: bool,
    pub show_stage_times: bool,
}

impl ReplOptions {
    pub fn new() -> ReplOptions {
        ReplOptions { debug_asks: HashSet::new(), show_total_time: true, show_stage_times: false }
    }

    pub fn save_to_file(&self, filename: &str) {
        let res = File::create(filename).and_then(|mut file| {
            let buf = crate::serde_json::to_string(self).unwrap();
            file.write_all(buf.as_bytes())
        });
        if let Err(err) = res {
            eprintln!("Error saving {} file {}", filename, err);
        }
    }

    pub fn load_from_file(filename: &str) -> Result<ReplOptions, io::Error> {
        File::open(filename)
            .and_then(|mut file| {
                let mut contents = String::new();
                file.read_to_string(&mut contents)?;
                Ok(contents)
            })
            .and_then(|contents| {
                let output: ReplOptions = crate::serde_json::from_str(&contents)?;
                Ok(output)
            })
    }
}