// Copyright 2019 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

use {heck::SnakeCase, std::iter};

pub fn to_c_name(name: &str) -> String {
    if name.is_empty() {
        name.to_string()
    } else {
        // strip FQN
        let name = name.split(".").last().unwrap();
        // Force uppercase characters the follow one another to lowercase.
        // e.g. GUIDType becomes Guidtype
        let mut iter = name.chars();
        let name = iter::once(iter.next().unwrap())
            .chain(iter.zip(name.chars()).map(|(c1, c2)| {
                if c2.is_ascii_uppercase() {
                    c1.to_ascii_lowercase()
                } else {
                    c1
                }
            }))
            .collect::<String>();
        name.trim().to_snake_case()
    }
}