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use chrono::{DateTime, Utc};
use url::Url;

/// Trait to define conversion to [`Url`]
pub trait TryIntoUrl {
    fn into_url(self) -> Result<Url, url::ParseError>;
}

impl TryIntoUrl for Url {
    fn into_url(self) -> Result<Url, url::ParseError> {
        Ok(self)
    }
}

impl TryIntoUrl for &str {
    fn into_url(self) -> Result<Url, url::ParseError> {
        Url::parse(self)
    }
}

impl TryIntoUrl for String {
    fn into_url(self) -> Result<Url, url::ParseError> {
        self.as_str().into_url()
    }
}

/// Trait to define conversion to [`DateTime`]
pub trait TryIntoTime {
    fn into_time(self) -> Result<DateTime<Utc>, chrono::ParseError>;
}

impl TryIntoTime for DateTime<Utc> {
    fn into_time(self) -> Result<DateTime<Utc>, chrono::ParseError> {
        Ok(self)
    }
}

impl TryIntoTime for &str {
    fn into_time(self) -> Result<DateTime<Utc>, chrono::ParseError> {
        Ok(DateTime::<Utc>::from(DateTime::parse_from_rfc3339(self)?))
    }
}

impl TryIntoTime for String {
    fn into_time(self) -> Result<DateTime<Utc>, chrono::ParseError> {
        self.as_str().into_time()
    }
}

/// The URI-reference type.
///
/// The URI reference can be a URI, or just a relative path.
///
/// As the [`url::Url`] type can only represent an absolute URL, we are falling back to a string
/// here.
///
/// Also see:
/// * <https://github.com/cloudevents/spec/blob/v1.0.1/spec.md#type-system>
/// * <https://tools.ietf.org/html/rfc3986#section-4.1>
pub type UriReference = String;