use convert_case::{Case, Casing};
use yaml_rust2::Yaml;

#[macro_export]
macro_rules! deserialize_error {
    ($kind:expr, $key:expr, $name:expr) => {
        panic!("Expected {} '{}' in {}.", $kind, $key, $name);
    };
}

pub fn make_build_fn_name(s: &str) -> String {
    format!("build_{}", s.to_case(Case::Snake))
}

pub fn make_build_pair(s: &str) -> String {
    format!("{}_pair", s.to_case(Case::Snake))
}

pub fn unwrap_single_member_hash(hash: &Yaml) -> (String, &Yaml) {
    let as_hash = hash.as_hash().unwrap();
    if as_hash.is_empty() {
        panic!("empty hash");
    } else if as_hash.len() > 1 {
        panic!("hash contains more than one key");
    }
    let (member_key, member_value) = as_hash.iter().collect::<Vec<(&Yaml, &Yaml)>>()[0];
    let key_as_string = member_key.as_str().unwrap().to_string();
    (key_as_string, member_value)
}

pub fn get_as_bool(yaml: &Yaml) -> bool {
    yaml.as_bool().unwrap_or(false)
}

pub fn get_as_bool_or(yaml: &Yaml, or: bool) -> bool {
    yaml.as_bool().unwrap_or(or)
}