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

#[derive(Debug, Deserialize)]
pub struct Config {
    pub working_directory: Option<PathBuf>,
}

impl Config {
    pub fn default() -> Config {
        Config {
            working_directory: None,
        }
    }
}

pub fn load_config(app_name: &str, file_name: &str) -> Result<Config> {
    // Create an XDG base directories instance
    let xdg_dirs =
        BaseDirectories::with_prefix(app_name).context("Failed to initialize XDG directories")?;

    let config_path = xdg_dirs
        .place_config_file(file_name)
        .context("Failed to determine configuration file path")?;

    if !config_path.exists() {
        return Err(anyhow!("No configuration file at {:?}", config_path));
    }

    let contents = fs::read_to_string(&config_path)
        .with_context(|| format!("Failed to read configuration file at {:?}", config_path))?;

    let config: Config = toml::from_str(&contents)
        .with_context(|| format!("Failed to parse TOML configuration at {:?}", config_path))?;
    Ok(config)
}