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use std::fs;

use crate::config::{config_file_path, read_config_file, Config};

/// Recompile when changed. Put me on your `build.rs`
pub fn when_changed() {
    // rerun when config file change
    println!(
        "cargo:rerun-if-changed={}",
        config_file_path().to_str().unwrap()
    );

    let file = read_config_file();
    let config = Config::new(&file);

    let mut stack = vec![config.get_dir().clone()];
    while let Some(dir) = stack.pop() {
        // rerun when dir change
        println!("cargo:rerun-if-changed={}", dir.to_str().unwrap());
        for entry in fs::read_dir(dir).expect("valid directory") {
            let path = entry.expect("valid directory entry").path();
            if path.is_dir() {
                stack.push(path);
            } else {
                // rerun when file change
                println!("cargo:rerun-if-changed={}", path.to_str().unwrap());
            }
        }
    }
}