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use crate::Result;
use std::borrow::Cow;

/// UrlEncode the given string
pub fn encode(url: &str) -> Result<Cow<str>> {
    let is_ascii = |c: &u8| matches!(c, b'0'..=b'9' | b'A'..=b'Z' | b'a'..=b'z' |  b'-' | b'.' | b'_' | b'~');
    let len = url.as_bytes()
                 .iter()
                 .take_while(|c| is_ascii(*c)).count();
    if len >= url.len() {
        return Ok(url.into());
    }
    let mut buf = String::new();
    for byte in url.as_bytes() {
        if is_ascii(byte) {
            buf.push(*byte as char);
        } else {
            buf += &format!("%{:X}", byte);
        }
    }
    Ok(buf.into())
}