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#![doc(html_favicon_url = "https://ruma.dev/favicon.ico")]
#![doc(html_logo_url = "https://ruma.dev/images/logo.png")]

pub mod client_secret;
pub mod device_key_id;
pub mod error;
pub mod event_id;
pub mod key_id;
pub mod mxc_uri;
pub mod room_alias_id;
pub mod room_id;
pub mod room_id_or_alias_id;
pub mod room_version_id;
pub mod server_name;
pub mod user_id;
pub mod voip_version_id;

pub use error::Error;

/// All identifiers must be 255 bytes or less.
#[cfg(not(feature = "compat-arbitrary-length-ids"))]
const MAX_BYTES: usize = 255;

/// Checks if an identifier is valid.
fn validate_id(id: &str, first_byte: u8) -> Result<(), Error> {
    #[cfg(not(feature = "compat-arbitrary-length-ids"))]
    if id.len() > MAX_BYTES {
        return Err(Error::MaximumLengthExceeded);
    }

    if id.as_bytes().first() != Some(&first_byte) {
        return Err(Error::MissingLeadingSigil);
    }

    Ok(())
}

/// Checks an identifier that contains a localpart and hostname for validity.
fn parse_id(id: &str, first_byte: u8) -> Result<usize, Error> {
    validate_id(id, first_byte)?;
    let colon_idx = id.find(':').ok_or(Error::MissingColon)?;
    server_name::validate(&id[colon_idx + 1..])?;
    Ok(colon_idx)
}

/// Checks an identifier that contains a localpart and hostname for validity.
fn validate_delimited_id(id: &str, first_byte: u8) -> Result<(), Error> {
    parse_id(id, first_byte)?;
    Ok(())
}