autumn-cli 0.1.0

fn main() {
    println!("cargo:rerun-if-changed=src/");
    println!("cargo:rerun-if-changed=tailwind.config.js");

    let tailwind = find_tailwind_cli();

    let status = std::process::Command::new(&tailwind)
        .args([
            "-i",
            "static/css/input.css",
            "-o",
            "static/css/autumn.css",
            "--content",
            "src/**/*.rs",
            "--minify",
        ])
        .status()
        .expect("Failed to run Tailwind CLI");

    if !status.success() {
        panic!("Tailwind CSS compilation failed");
    }
}

fn find_tailwind_cli() -> std::path::PathBuf {
    // 1. Check local download (from `autumn setup`)
    let local = std::path::PathBuf::from("target/autumn/tailwindcss");
    if local.exists() {
        return local;
    }

    // 2. Check PATH
    if let Some(path) = which("tailwindcss") {
        return path;
    }

    // 3. Fail with clear message
    panic!(
        "\n\nTailwind CSS CLI not found!\n\n\
         Install it using one of:\n\
         1. Run `autumn setup` to download it automatically\n\
         2. Install manually: https://tailwindcss.com/blog/standalone-cli\n\
         3. Add `tailwindcss` to your PATH\n\n\
         To skip Tailwind, delete build.rs from your project.\n"
    );
}

fn which(binary: &str) -> Option<std::path::PathBuf> {
    let path_var = std::env::var_os("PATH")?;
    for dir in std::env::split_paths(&path_var) {
        let candidate = dir.join(binary);
        if candidate.exists() {
            return Some(candidate);
        }
        #[cfg(target_os = "windows")]
        {
            let candidate_exe = dir.join(format!("{binary}.exe"));
            if candidate_exe.exists() {
                return Some(candidate_exe);
            }
        }
    }
    None
}