use anyhow::Result;
use serde::{Deserialize, Serialize};

use std::{
    fs::{self, File},
    io::Write,
    path::Path,
};

pub const COMMAND_COUNT: usize = 8;

#[derive(Debug, Serialize, Deserialize, Default)]
pub struct Config {
    pub commands: [Option<String>; COMMAND_COUNT],
}

impl Config {
    pub fn load_config() -> Result<Config> {
        let home_dir = std::env::var("HOME")?;

        if !Path::new(&format!("{}/.config", home_dir)).exists() {
            fs::create_dir(format!("{}/.config", home_dir))?;
        }

        if !Path::new(&format!("{}/.config/MacroBoard", home_dir)).exists() {
            fs::create_dir(format!("{}/.config/MacroBoard", home_dir))?;
        }

        Config::open(&format!("{}/.config/MacroBoard/commands.cfg", home_dir))
    }

    pub fn open(path: &str) -> Result<Config> {
        if Path::new(path).exists() {
            Ok(serde_json::from_str(&std::fs::read_to_string(path)?)?)
        } else {
            Ok(Config::default())
        }
    }

    pub fn save(&self, path: &str) -> Result<()> {
        let mut file = File::create(path)?;
        let s = serde_json::to_string(self)?;

        write!(file, "{}", s)?;

        Ok(())
    }
}