use super::funejson::Value;
use super::validation_email::is_email;

fn is_ascii_space(ch: char) -> bool {
    matches!(ch, ' ' | '\t' | '\n' | '\r' | '\u{0C}' | '\u{0B}')
}

/// The stored form of an email address: trimmed, domain lower-cased, local
/// part as typed; `None` when the trimmed text is not a plausible address.
pub fn normalise_email(value: &str) -> Option<String> {
    // ASCII whitespace only; str::trim also strips Unicode spaces.
    let trimmed = value.trim_matches(is_ascii_space);
    if !is_email(trimmed) {
        return None;
    }
    let at = trimmed.find('@').unwrap();
    Some(format!("{}{}", &trimmed[..=at], trimmed[at + 1..].to_ascii_lowercase()))
}

pub fn fune_vector(args: &[Value]) -> Value {
    match normalise_email(args[0].as_str()) {
        Some(email) => Value::Str(email),
        None => Value::Null,
    }
}