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//! # ListenAddress
//! ```
//! use core::str::FromStr;
//! use std::net::{IpAddr, Ipv4Addr, SocketAddr};
//!
//! use socket_address::ListenAddress;
//!
//! let addr = ListenAddress::from_str("0.0.0.0:80").unwrap();
//! assert_eq!(addr, ListenAddress::Network(SocketAddr::new(IpAddr::V4(Ipv4Addr::new(0, 0, 0, 0)), 80)));
//! ```
//!
//! ```
//! use core::str::FromStr;
//! use std::path::PathBuf;
//!
//! use socket_address::ListenAddress;
//!
//! let addr = ListenAddress::from_str("unix:myapp.sock").unwrap();
//! assert_eq!(addr, ListenAddress::UnixSocket("myapp.sock".into()));
//! ```
//!
//! # ConnectAddress
//! ```
//! use core::str::FromStr;
//! use http::Uri;
//!
//! use socket_address::ConnectAddress;
//!
//! let addr = ConnectAddress::from_str("http://127.0.0.1/").unwrap();
//! assert_eq!(addr, ConnectAddress::Uri(Uri::from_str("http://127.0.0.1/").unwrap()));
//! ```
//!
//! ```
//! use core::str::FromStr;
//! use std::path::PathBuf;
//!
//! use socket_address::ConnectAddress;
//!
//! let addr = ConnectAddress::from_str("unix:myapp.sock").unwrap();
//! assert_eq!(addr, ConnectAddress::UnixSocket("myapp.sock".into()));
//! ```
use core::fmt;
use core::str::FromStr;
use std::net::SocketAddr;
use std::path::PathBuf;

use http::Uri;

#[derive(Clone, Debug, PartialEq, Eq)]
pub enum ListenAddress {
	Network(SocketAddr),
	UnixSocket(PathBuf),
}

#[derive(Clone, Debug, PartialEq, Eq)]
pub enum ConnectAddress {
	Uri(Uri),
	UnixSocket(PathBuf),
}

impl FromStr for ListenAddress {
	type Err = Error;

	fn from_str(s: &str) -> Result<Self, Self::Err> {
		match s.strip_prefix("unix:") {
			Some(v) => Ok(Self::UnixSocket(v.into())),
			None => match SocketAddr::from_str(s) {
				Ok(v) => Ok(Self::Network(v)),
				Err(_) => Err(Error::InvalidListenAddress(s.to_owned())),
			},
		}
	}
}

impl fmt::Display for ListenAddress {
	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
		match self {
			Self::Network(addr) => addr.fmt(f),
			Self::UnixSocket(path) => {
				f.write_str("unix:")?;
				path.display().fmt(f)
			},
		}
	}
}

impl FromStr for ConnectAddress {
	type Err = Error;

	fn from_str(s: &str) -> Result<Self, Self::Err> {
		match s.strip_prefix("unix:") {
			Some(v) => Ok(Self::UnixSocket(v.into())),
			None => Ok(Self::Uri(Uri::from_str(s)?)),
		}
	}
}

impl fmt::Display for ConnectAddress {
	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> Result<(), fmt::Error> {
		match self {
			Self::UnixSocket(path) => {
				f.write_str("unix:")?;
				path.display().fmt(f)
			},
			Self::Uri(uri) => uri.fmt(f),
		}
	}
}

impl TryFrom<ConnectAddress> for ListenAddress {
	type Error = Error;

	fn try_from(value: ConnectAddress) -> Result<Self, Self::Error> {
		Ok(match value {
			ConnectAddress::Uri(uri) => {
				let no_scheme = format!("{}:{}", uri.host().ok_or(Error::MissingHost)?, uri.port().ok_or(Error::MissingPort)?);
				Self::Network(SocketAddr::from_str(&no_scheme).map_err(|_| Error::InvalidListenAddress(no_scheme))?)
			},
			ConnectAddress::UnixSocket(path) => Self::UnixSocket(path),
		})
	}
}

#[derive(Debug, thiserror::Error)]
pub enum Error {
	#[error("'{0}' is neither a valid IP:port address nor a path prefixed with 'unix:'")]
	InvalidListenAddress(String),

	#[error("String has a scheme prefix of either http or https but could not be parsed into a Uri: {0}")]
	InvalidUri(#[from] http::uri::InvalidUri),

	#[error("The address is missing a host")]
	MissingHost,

	#[error("The address is missing a port")]
	MissingPort,
}