//! Player progress saved to `./.gameplay/state.yaml`.

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

use crate::levels::Difficulty;

#[derive(Default, Serialize, Deserialize)]
pub struct Progress {
    pub tier: Option<Difficulty>,
    pub completed: Vec<u8>,
    pub current_level: u8,
    pub current_seed: u64,
    pub attempts: u32,
}

pub fn save_path() -> PathBuf {
    PathBuf::from(".gameplay/state.yaml")
}

pub fn load() -> Result<Progress> {
    let path = save_path();
    if !path.exists() {
        return Ok(Progress::default());
    }
    Ok(serde_yaml::from_str(&std::fs::read_to_string(&path)?)?)
}

pub fn save(progress: &Progress) -> Result<()> {
    let path = save_path();
    // First-run safeguard: `.gameplay/` won't exist yet.
    if let Some(dir) = path.parent() {
        std::fs::create_dir_all(dir)?;
    }
    std::fs::write(&path, serde_yaml::to_string(progress)?)?;
    Ok(())
}