use anyhow::{Context, Result};
use serde::{Deserialize, Serialize};
use std::fs;
use std::path::PathBuf;

const DEFAULT_PATH: &str = "/etc/mountaineer/sysop.toml";

pub fn path() -> PathBuf {
    std::env::var_os("SYSOP_CONFIG")
        .map(PathBuf::from)
        .unwrap_or_else(|| PathBuf::from(DEFAULT_PATH))
}

#[derive(Debug, Default, Serialize, Deserialize)]
pub struct Config {
    #[serde(default)]
    pub motd: Motd,
}

#[derive(Debug, Serialize, Deserialize)]
pub struct Motd {
    pub enabled: bool,
}

impl Default for Motd {
    fn default() -> Self {
        Self { enabled: true }
    }
}

pub fn load() -> Result<Config> {
    let p = path();
    if !p.exists() {
        return Ok(Config::default());
    }
    let s = fs::read_to_string(&p).with_context(|| format!("read {}", p.display()))?;
    toml::from_str(&s).with_context(|| format!("parse {}", p.display()))
}

pub fn save(cfg: &Config) -> Result<()> {
    let p = path();
    if let Some(dir) = p.parent() {
        fs::create_dir_all(dir).with_context(|| format!("create {}", dir.display()))?;
    }
    let s = toml::to_string_pretty(cfg).context("serialize config")?;
    fs::write(&p, s).with_context(|| format!("write {}", p.display()))
}