use std::{env, fs, path::Path};
fn main() {
    println!("cargo:rerun-if-env-changed=CSR_BUILD_ID");
    println!("cargo:rerun-if-changed=src");
    println!("cargo:rerun-if-changed=../scripts/inventory-sync.py");
    println!("cargo:rerun-if-changed=Cargo.lock");
    fn hash_dir(path: &Path, hash: &mut u64) {
        let mut files: Vec<_> = fs::read_dir(path)
            .unwrap()
            .flatten()
            .map(|e| e.path())
            .collect();
        files.sort();
        for p in files {
            if p.is_dir() {
                hash_dir(&p, hash);
            } else {
                for b in fs::read(p).unwrap() {
                    *hash = (*hash ^ b as u64).wrapping_mul(1099511628211);
                }
            }
        }
    }
    let mut hash = 14695981039346656037u64;
    hash_dir(Path::new("src"), &mut hash);
    for file in [
        "../scripts/inventory-sync.py",
        "Cargo.toml",
        "Cargo.lock",
        "build.rs",
    ] {
        for b in fs::read(file).unwrap() {
            hash = (hash ^ b as u64).wrapping_mul(1099511628211);
        }
    }
    let id = env::var("CSR_BUILD_ID")
        .unwrap_or_else(|_| format!("{}-{hash:016x}", env::var("CARGO_PKG_VERSION").unwrap()));
    println!("cargo:rustc-env=CSR_BUILD_ID={id}");
}