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//! Types for handling bootstrap domain names.

use std::{convert::TryFrom, fmt};

use serde::{Deserialize, Serialize};

use koibumi_core::net::{ParseSocketAddrExtError, SocketAddrExt};
use koibumi_socks_core::{ParseSocketAddrError, SocketAddr as SocksSocketAddr};

/// A bootstrap socket domain name.
#[derive(Clone, PartialEq, Eq, Hash, Debug, Serialize, Deserialize)]
pub struct Bootstrap(String);

impl fmt::Display for Bootstrap {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        self.0.fmt(f)
    }
}

impl From<&str> for Bootstrap {
    fn from(s: &str) -> Self {
        Self(s.to_string())
    }
}

impl AsRef<str> for Bootstrap {
    fn as_ref(&self) -> &str {
        &self.0
    }
}

/// The error type returned when a conversion from a Bootstrap socket domain name
/// to a SOCKS socket address fails.
///
/// This error is used as the error type for the `TryFrom` implementation
/// for `SocksSocketAddr`.
#[derive(Clone, PartialEq, Eq, Debug)]
pub enum TryFromBootstrapError {
    /// An error was caught when parsing a SOCKS socket address.
    /// The actual error caught is returned
    /// as a payload of this variant.
    ParseSocketAddrError(ParseSocketAddrError),
}

impl fmt::Display for TryFromBootstrapError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::ParseSocketAddrError(err) => err.fmt(f),
        }
    }
}

impl From<ParseSocketAddrError> for TryFromBootstrapError {
    fn from(err: ParseSocketAddrError) -> Self {
        Self::ParseSocketAddrError(err)
    }
}

impl std::error::Error for TryFromBootstrapError {}

impl TryFrom<Bootstrap> for SocksSocketAddr {
    type Error = TryFromBootstrapError;

    fn try_from(bs: Bootstrap) -> Result<Self, <Self as TryFrom<Bootstrap>>::Error> {
        Ok(bs.0.parse::<Self>()?)
    }
}

/// A bootstrap socket address or an extended socket address.
#[derive(Clone, PartialEq, Eq, Hash, Debug)]
pub enum SocketAddrNode {
    /// A bootstrap socket address.
    Bootstrap(Bootstrap),
    /// An extended socket address.
    Normal(SocketAddrExt),
}

impl fmt::Display for SocketAddrNode {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::Bootstrap(addr) => addr.fmt(f),
            Self::Normal(addr) => addr.fmt(f),
        }
    }
}

impl From<Bootstrap> for SocketAddrNode {
    fn from(addr: Bootstrap) -> Self {
        Self::Bootstrap(addr)
    }
}

impl From<SocketAddrExt> for SocketAddrNode {
    fn from(addr: SocketAddrExt) -> Self {
        Self::Normal(addr)
    }
}

/// The error type returned when a conversion from a Bootstrap socket domain name
/// to a SOCKS socket address fails.
///
/// This error is used as the error type for the `TryFrom` implementation
/// for `SocksSocketAddr`.
#[derive(Clone, PartialEq, Eq, Debug)]
pub enum TryFromSocketAddrNodeError {
    /// An error was caught when parsing a SOCKS socket address.
    /// The actual error caught is returned
    /// as a payload of this variant.
    ParseSocketAddrExtError(ParseSocketAddrExtError),
}

impl fmt::Display for TryFromSocketAddrNodeError {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        match self {
            Self::ParseSocketAddrExtError(err) => err.fmt(f),
        }
    }
}

impl From<ParseSocketAddrExtError> for TryFromSocketAddrNodeError {
    fn from(err: ParseSocketAddrExtError) -> Self {
        Self::ParseSocketAddrExtError(err)
    }
}

impl std::error::Error for TryFromSocketAddrNodeError {}

impl TryFrom<SocketAddrNode> for SocketAddrExt {
    type Error = TryFromSocketAddrNodeError;

    fn try_from(addr: SocketAddrNode) -> Result<Self, <Self as TryFrom<SocketAddrNode>>::Error> {
        match addr {
            SocketAddrNode::Bootstrap(addr) => Ok(addr.0.parse::<Self>()?),
            SocketAddrNode::Normal(addr) => Ok(addr),
        }
    }
}