use std::path::PathBuf;

/// Resolve the project root from the executable path.
/// In dev mode, the binary lives at: <root>/src-tauri/target/debug/<bin>
/// So the project root is 4 levels above the binary.
pub fn project_root() -> PathBuf {
    let exe = std::env::current_exe().expect("Failed to get executable path");
    // exe -> debug/ -> target/ -> src-tauri/ -> root
    exe.parent()
        .and_then(|p| p.parent())
        .and_then(|p| p.parent())
        .and_then(|p| p.parent())
        .map(|p| p.to_path_buf())
        .unwrap_or_else(|| PathBuf::from("."))
}

/// Absolute path to the venv Python 3.10 interpreter.
pub fn python_exe() -> PathBuf {
    project_root().join(".venv/bin/python3.10")
}

/// Absolute path to a script in the backend directory.
pub fn backend_script(name: &str) -> PathBuf {
    project_root().join("backend").join(name)
}

/// Absolute path to a script at the project root.
pub fn root_script(name: &str) -> PathBuf {
    project_root().join(name)
}