use anyhow::{anyhow, Result};
use serde::{Deserialize, Serialize};
use std::{
    fs::{read_to_string, rename, File},
    io::Write,
    path::PathBuf,
};

#[derive(Serialize, Deserialize)]
pub struct Config {
    username: String,
}

impl Config {
    pub fn path() -> Result<PathBuf> {
        Ok(xdg::BaseDirectories::with_prefix("pixelcurry")?.place_config_file("config.toml")?)
    }
    pub fn load() -> Result<Self> {
        let path = Self::path()?;
        if path.exists() {
            Ok(toml::from_str(&read_to_string(path)?)?)
        } else {
            File::create(path)?.write_all(toml::to_string(&Self::initial()?)?.as_bytes())?;
            Self::load()
        }
    }
    pub fn save(&self) -> Result<()> {
        let path = Self::path()?;
        let temp = path.with_added_extension("~");
        File::create(&temp)?.write_all(toml::to_string(self)?.as_bytes())?;
        rename(temp, path)?;
        Ok(())
    }
    pub fn initial() -> Result<Self> {
        Ok(Config {
            username: users::get_current_username()
                .ok_or(anyhow!("current user has no name"))?
                .to_str()
                .ok_or(anyhow!("current user's name is not valid UTF8"))?
                .to_owned(),
        })
    }
}